| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| David Chinner | 11097 | 40.40% | 112 | 23.14% |
| Christoph Hellwig | 9919 | 36.12% | 155 | 32.02% |
| Darrick J. Wong | 3369 | 12.27% | 106 | 21.90% |
| Brian Foster | 899 | 3.27% | 37 | 7.64% |
| Namjae Jeon | 731 | 2.66% | 2 | 0.41% |
| Chandan Babu R | 629 | 2.29% | 14 | 2.89% |
| Nathan Scott | 212 | 0.77% | 11 | 2.27% |
| Eric Sandeen | 154 | 0.56% | 13 | 2.69% |
| Allison Henderson | 77 | 0.28% | 1 | 0.21% |
| Jiachen Zhang | 65 | 0.24% | 1 | 0.21% |
| Mandy Kirkconnell | 60 | 0.22% | 3 | 0.62% |
| Shan Hai | 51 | 0.19% | 2 | 0.41% |
| Russell Cattelan | 40 | 0.15% | 2 | 0.41% |
| Stephen Lord | 34 | 0.12% | 3 | 0.62% |
| Mark Tinguely | 33 | 0.12% | 3 | 0.62% |
| Omar Sandoval | 32 | 0.12% | 1 | 0.21% |
| Bill O'Donnell | 16 | 0.06% | 1 | 0.21% |
| Lachlan McIlroy | 9 | 0.03% | 4 | 0.83% |
| Jie Liu | 9 | 0.03% | 1 | 0.21% |
| Olaf Weber | 8 | 0.03% | 1 | 0.21% |
| Al Viro | 5 | 0.02% | 1 | 0.21% |
| Jon Krueger | 5 | 0.02% | 1 | 0.21% |
| Zhi Yong Wu | 2 | 0.01% | 2 | 0.41% |
| Yingping Lu | 2 | 0.01% | 1 | 0.21% |
| Thomas Meyer | 2 | 0.01% | 1 | 0.21% |
| Ben Myers | 1 | 0.00% | 1 | 0.21% |
| Zeng Heng | 1 | 0.00% | 1 | 0.21% |
| Kamal Dasu | 1 | 0.00% | 1 | 0.21% |
| Glen Overby | 1 | 0.00% | 1 | 0.21% |
| Malcolm Parsons | 1 | 0.00% | 1 | 0.21% |
| Total | 27465 | 484 |
// SPDX-License-Identifier: GPL-2.0 /* * Copyright (c) 2000-2006 Silicon Graphics, Inc. * All Rights Reserved. */ #include "xfs.h" #include "xfs_fs.h" #include "xfs_shared.h" #include "xfs_format.h" #include "xfs_log_format.h" #include "xfs_trans_resv.h" #include "xfs_bit.h" #include "xfs_sb.h" #include "xfs_mount.h" #include "xfs_defer.h" #include "xfs_dir2.h" #include "xfs_inode.h" #include "xfs_btree.h" #include "xfs_trans.h" #include "xfs_alloc.h" #include "xfs_bmap.h" #include "xfs_bmap_util.h" #include "xfs_bmap_btree.h" #include "xfs_rtbitmap.h" #include "xfs_errortag.h" #include "xfs_error.h" #include "xfs_quota.h" #include "xfs_trans_space.h" #include "xfs_buf_item.h" #include "xfs_trace.h" #include "xfs_attr_leaf.h" #include "xfs_filestream.h" #include "xfs_rmap.h" #include "xfs_ag.h" #include "xfs_ag_resv.h" #include "xfs_refcount.h" #include "xfs_icache.h" #include "xfs_iomap.h" struct kmem_cache *xfs_bmap_intent_cache; /* * Miscellaneous helper functions */ /* * Compute and fill in the value of the maximum depth of a bmap btree * in this filesystem. Done once, during mount. */ void xfs_bmap_compute_maxlevels( xfs_mount_t *mp, /* file system mount structure */ int whichfork) /* data or attr fork */ { uint64_t maxblocks; /* max blocks at this level */ xfs_extnum_t maxleafents; /* max leaf entries possible */ int level; /* btree level */ int maxrootrecs; /* max records in root block */ int minleafrecs; /* min records in leaf block */ int minnoderecs; /* min records in node block */ int sz; /* root block size */ /* * The maximum number of extents in a fork, hence the maximum number of * leaf entries, is controlled by the size of the on-disk extent count. * * Note that we can no longer assume that if we are in ATTR1 that the * fork offset of all the inodes will be * (xfs_default_attroffset(ip) >> 3) because we could have mounted with * ATTR2 and then mounted back with ATTR1, keeping the i_forkoff's fixed * but probably at various positions. Therefore, for both ATTR1 and * ATTR2 we have to assume the worst case scenario of a minimum size * available. */ maxleafents = xfs_iext_max_nextents(xfs_has_large_extent_counts(mp), whichfork); if (whichfork == XFS_DATA_FORK) sz = XFS_BMDR_SPACE_CALC(MINDBTPTRS); else sz = XFS_BMDR_SPACE_CALC(MINABTPTRS); maxrootrecs = xfs_bmdr_maxrecs(sz, 0); minleafrecs = mp->m_bmap_dmnr[0]; minnoderecs = mp->m_bmap_dmnr[1]; maxblocks = howmany_64(maxleafents, minleafrecs); for (level = 1; maxblocks > 1; level++) { if (maxblocks <= maxrootrecs) maxblocks = 1; else maxblocks = howmany_64(maxblocks, minnoderecs); } mp->m_bm_maxlevels[whichfork] = level; ASSERT(mp->m_bm_maxlevels[whichfork] <= xfs_bmbt_maxlevels_ondisk()); } unsigned int xfs_bmap_compute_attr_offset( struct xfs_mount *mp) { if (mp->m_sb.sb_inodesize == 256) return XFS_LITINO(mp) - XFS_BMDR_SPACE_CALC(MINABTPTRS); return XFS_BMDR_SPACE_CALC(6 * MINABTPTRS); } STATIC int /* error */ xfs_bmbt_lookup_eq( struct xfs_btree_cur *cur, struct xfs_bmbt_irec *irec, int *stat) /* success/failure */ { cur->bc_rec.b = *irec; return xfs_btree_lookup(cur, XFS_LOOKUP_EQ, stat); } STATIC int /* error */ xfs_bmbt_lookup_first( struct xfs_btree_cur *cur, int *stat) /* success/failure */ { cur->bc_rec.b.br_startoff = 0; cur->bc_rec.b.br_startblock = 0; cur->bc_rec.b.br_blockcount = 0; return xfs_btree_lookup(cur, XFS_LOOKUP_GE, stat); } /* * Check if the inode needs to be converted to btree format. */ static inline bool xfs_bmap_needs_btree(struct xfs_inode *ip, int whichfork) { struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork); return whichfork != XFS_COW_FORK && ifp->if_format == XFS_DINODE_FMT_EXTENTS && ifp->if_nextents > XFS_IFORK_MAXEXT(ip, whichfork); } /* * Check if the inode should be converted to extent format. */ static inline bool xfs_bmap_wants_extents(struct xfs_inode *ip, int whichfork) { struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork); return whichfork != XFS_COW_FORK && ifp->if_format == XFS_DINODE_FMT_BTREE && ifp->if_nextents <= XFS_IFORK_MAXEXT(ip, whichfork); } /* * Update the record referred to by cur to the value given by irec * This either works (return 0) or gets an EFSCORRUPTED error. */ STATIC int xfs_bmbt_update( struct xfs_btree_cur *cur, struct xfs_bmbt_irec *irec) { union xfs_btree_rec rec; xfs_bmbt_disk_set_all(&rec.bmbt, irec); return xfs_btree_update(cur, &rec); } /* * Compute the worst-case number of indirect blocks that will be used * for ip's delayed extent of length "len". */ STATIC xfs_filblks_t xfs_bmap_worst_indlen( xfs_inode_t *ip, /* incore inode pointer */ xfs_filblks_t len) /* delayed extent length */ { int level; /* btree level number */ int maxrecs; /* maximum record count at this level */ xfs_mount_t *mp; /* mount structure */ xfs_filblks_t rval; /* return value */ mp = ip->i_mount; maxrecs = mp->m_bmap_dmxr[0]; for (level = 0, rval = 0; level < XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK); level++) { len += maxrecs - 1; do_div(len, maxrecs); rval += len; if (len == 1) return rval + XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK) - level - 1; if (level == 0) maxrecs = mp->m_bmap_dmxr[1]; } return rval; } /* * Calculate the default attribute fork offset for newly created inodes. */ uint xfs_default_attroffset( struct xfs_inode *ip) { if (ip->i_df.if_format == XFS_DINODE_FMT_DEV) return roundup(sizeof(xfs_dev_t), 8); return M_IGEO(ip->i_mount)->attr_fork_offset; } /* * Helper routine to reset inode i_forkoff field when switching attribute fork * from local to extent format - we reset it where possible to make space * available for inline data fork extents. */ STATIC void xfs_bmap_forkoff_reset( xfs_inode_t *ip, int whichfork) { if (whichfork == XFS_ATTR_FORK && ip->i_df.if_format != XFS_DINODE_FMT_DEV && ip->i_df.if_format != XFS_DINODE_FMT_BTREE) { uint dfl_forkoff = xfs_default_attroffset(ip) >> 3; if (dfl_forkoff > ip->i_forkoff) ip->i_forkoff = dfl_forkoff; } } #ifdef DEBUG STATIC struct xfs_buf * xfs_bmap_get_bp( struct xfs_btree_cur *cur, xfs_fsblock_t bno) { struct xfs_log_item *lip; int i; if (!cur) return NULL; for (i = 0; i < cur->bc_maxlevels; i++) { if (!cur->bc_levels[i].bp) break; if (xfs_buf_daddr(cur->bc_levels[i].bp) == bno) return cur->bc_levels[i].bp; } /* Chase down all the log items to see if the bp is there */ list_for_each_entry(lip, &cur->bc_tp->t_items, li_trans) { struct xfs_buf_log_item *bip = (struct xfs_buf_log_item *)lip; if (bip->bli_item.li_type == XFS_LI_BUF && xfs_buf_daddr(bip->bli_buf) == bno) return bip->bli_buf; } return NULL; } STATIC void xfs_check_block( struct xfs_btree_block *block, xfs_mount_t *mp, int root, short sz) { int i, j, dmxr; __be64 *pp, *thispa; /* pointer to block address */ xfs_bmbt_key_t *prevp, *keyp; ASSERT(be16_to_cpu(block->bb_level) > 0); prevp = NULL; for( i = 1; i <= xfs_btree_get_numrecs(block); i++) { dmxr = mp->m_bmap_dmxr[0]; keyp = XFS_BMBT_KEY_ADDR(mp, block, i); if (prevp) { ASSERT(be64_to_cpu(prevp->br_startoff) < be64_to_cpu(keyp->br_startoff)); } prevp = keyp; /* * Compare the block numbers to see if there are dups. */ if (root) pp = XFS_BMAP_BROOT_PTR_ADDR(mp, block, i, sz); else pp = XFS_BMBT_PTR_ADDR(mp, block, i, dmxr); for (j = i+1; j <= be16_to_cpu(block->bb_numrecs); j++) { if (root) thispa = XFS_BMAP_BROOT_PTR_ADDR(mp, block, j, sz); else thispa = XFS_BMBT_PTR_ADDR(mp, block, j, dmxr); if (*thispa == *pp) { xfs_warn(mp, "%s: thispa(%d) == pp(%d) %lld", __func__, j, i, (unsigned long long)be64_to_cpu(*thispa)); xfs_err(mp, "%s: ptrs are equal in node\n", __func__); xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE); } } } } /* * Check that the extents for the inode ip are in the right order in all * btree leaves. THis becomes prohibitively expensive for large extent count * files, so don't bother with inodes that have more than 10,000 extents in * them. The btree record ordering checks will still be done, so for such large * bmapbt constructs that is going to catch most corruptions. */ STATIC void xfs_bmap_check_leaf_extents( struct xfs_btree_cur *cur, /* btree cursor or null */ xfs_inode_t *ip, /* incore inode pointer */ int whichfork) /* data or attr fork */ { struct xfs_mount *mp = ip->i_mount; struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork); struct xfs_btree_block *block; /* current btree block */ xfs_fsblock_t bno; /* block # of "block" */ struct xfs_buf *bp; /* buffer for "block" */ int error; /* error return value */ xfs_extnum_t i=0, j; /* index into the extents list */ int level; /* btree level, for checking */ __be64 *pp; /* pointer to block address */ xfs_bmbt_rec_t *ep; /* pointer to current extent */ xfs_bmbt_rec_t last = {0, 0}; /* last extent in prev block */ xfs_bmbt_rec_t *nextp; /* pointer to next extent */ int bp_release = 0; if (ifp->if_format != XFS_DINODE_FMT_BTREE) return; /* skip large extent count inodes */ if (ip->i_df.if_nextents > 10000) return; bno = NULLFSBLOCK; block = ifp->if_broot; /* * Root level must use BMAP_BROOT_PTR_ADDR macro to get ptr out. */ level = be16_to_cpu(block->bb_level); ASSERT(level > 0); xfs_check_block(block, mp, 1, ifp->if_broot_bytes); pp = XFS_BMAP_BROOT_PTR_ADDR(mp, block, 1, ifp->if_broot_bytes); bno = be64_to_cpu(*pp); ASSERT(bno != NULLFSBLOCK); ASSERT(XFS_FSB_TO_AGNO(mp, bno) < mp->m_sb.sb_agcount); ASSERT(XFS_FSB_TO_AGBNO(mp, bno) < mp->m_sb.sb_agblocks); /* * Go down the tree until leaf level is reached, following the first * pointer (leftmost) at each level. */ while (level-- > 0) { /* See if buf is in cur first */ bp_release = 0; bp = xfs_bmap_get_bp(cur, XFS_FSB_TO_DADDR(mp, bno)); if (!bp) { bp_release = 1; error = xfs_btree_read_bufl(mp, NULL, bno, &bp, XFS_BMAP_BTREE_REF, &xfs_bmbt_buf_ops); if (error) goto error_norelse; } block = XFS_BUF_TO_BLOCK(bp); if (level == 0) break; /* * Check this block for basic sanity (increasing keys and * no duplicate blocks). */ xfs_check_block(block, mp, 0, 0); pp = XFS_BMBT_PTR_ADDR(mp, block, 1, mp->m_bmap_dmxr[1]); bno = be64_to_cpu(*pp); if (XFS_IS_CORRUPT(mp, !xfs_verify_fsbno(mp, bno))) { error = -EFSCORRUPTED; goto error0; } if (bp_release) { bp_release = 0; xfs_trans_brelse(NULL, bp); } } /* * Here with bp and block set to the leftmost leaf node in the tree. */ i = 0; /* * Loop over all leaf nodes checking that all extents are in the right order. */ for (;;) { xfs_fsblock_t nextbno; xfs_extnum_t num_recs; num_recs = xfs_btree_get_numrecs(block); /* * Read-ahead the next leaf block, if any. */ nextbno = be64_to_cpu(block->bb_u.l.bb_rightsib); /* * Check all the extents to make sure they are OK. * If we had a previous block, the last entry should * conform with the first entry in this one. */ ep = XFS_BMBT_REC_ADDR(mp, block, 1); if (i) { ASSERT(xfs_bmbt_disk_get_startoff(&last) + xfs_bmbt_disk_get_blockcount(&last) <= xfs_bmbt_disk_get_startoff(ep)); } for (j = 1; j < num_recs; j++) { nextp = XFS_BMBT_REC_ADDR(mp, block, j + 1); ASSERT(xfs_bmbt_disk_get_startoff(ep) + xfs_bmbt_disk_get_blockcount(ep) <= xfs_bmbt_disk_get_startoff(nextp)); ep = nextp; } last = *ep; i += num_recs; if (bp_release) { bp_release = 0; xfs_trans_brelse(NULL, bp); } bno = nextbno; /* * If we've reached the end, stop. */ if (bno == NULLFSBLOCK) break; bp_release = 0; bp = xfs_bmap_get_bp(cur, XFS_FSB_TO_DADDR(mp, bno)); if (!bp) { bp_release = 1; error = xfs_btree_read_bufl(mp, NULL, bno, &bp, XFS_BMAP_BTREE_REF, &xfs_bmbt_buf_ops); if (error) goto error_norelse; } block = XFS_BUF_TO_BLOCK(bp); } return; error0: xfs_warn(mp, "%s: at error0", __func__); if (bp_release) xfs_trans_brelse(NULL, bp); error_norelse: xfs_warn(mp, "%s: BAD after btree leaves for %llu extents", __func__, i); xfs_err(mp, "%s: CORRUPTED BTREE OR SOMETHING", __func__); xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE); return; } /* * Validate that the bmbt_irecs being returned from bmapi are valid * given the caller's original parameters. Specifically check the * ranges of the returned irecs to ensure that they only extend beyond * the given parameters if the XFS_BMAPI_ENTIRE flag was set. */ STATIC void xfs_bmap_validate_ret( xfs_fileoff_t bno, xfs_filblks_t len, uint32_t flags, xfs_bmbt_irec_t *mval, int nmap, int ret_nmap) { int i; /* index to map values */ ASSERT(ret_nmap <= nmap); for (i = 0; i < ret_nmap; i++) { ASSERT(mval[i].br_blockcount > 0); if (!(flags & XFS_BMAPI_ENTIRE)) { ASSERT(mval[i].br_startoff >= bno); ASSERT(mval[i].br_blockcount <= len); ASSERT(mval[i].br_startoff + mval[i].br_blockcount <= bno + len); } else { ASSERT(mval[i].br_startoff < bno + len); ASSERT(mval[i].br_startoff + mval[i].br_blockcount > bno); } ASSERT(i == 0 || mval[i - 1].br_startoff + mval[i - 1].br_blockcount == mval[i].br_startoff); ASSERT(mval[i].br_startblock != DELAYSTARTBLOCK && mval[i].br_startblock != HOLESTARTBLOCK); ASSERT(mval[i].br_state == XFS_EXT_NORM || mval[i].br_state == XFS_EXT_UNWRITTEN); } } #else #define xfs_bmap_check_leaf_extents(cur, ip, whichfork) do { } while (0) #define xfs_bmap_validate_ret(bno,len,flags,mval,onmap,nmap) do { } while (0) #endif /* DEBUG */ /* * Inode fork format manipulation functions */ /* * Convert the inode format to extent format if it currently is in btree format, * but the extent list is small enough that it fits into the extent format. * * Since the extents are already in-core, all we have to do is give up the space * for the btree root and pitch the leaf block. */ STATIC int /* error */ xfs_bmap_btree_to_extents( struct xfs_trans *tp, /* transaction pointer */ struct xfs_inode *ip, /* incore inode pointer */ struct xfs_btree_cur *cur, /* btree cursor */ int *logflagsp, /* inode logging flags */ int whichfork) /* data or attr fork */ { struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork); struct xfs_mount *mp = ip->i_mount; struct xfs_btree_block *rblock = ifp->if_broot; struct xfs_btree_block *cblock;/* child btree block */ xfs_fsblock_t cbno; /* child block number */ struct xfs_buf *cbp; /* child block's buffer */ int error; /* error return value */ __be64 *pp; /* ptr to block address */ struct xfs_owner_info oinfo; /* check if we actually need the extent format first: */ if (!xfs_bmap_wants_extents(ip, whichfork)) return 0; ASSERT(cur); ASSERT(whichfork != XFS_COW_FORK); ASSERT(ifp->if_format == XFS_DINODE_FMT_BTREE); ASSERT(be16_to_cpu(rblock->bb_level) == 1); ASSERT(be16_to_cpu(rblock->bb_numrecs) == 1); ASSERT(xfs_bmbt_maxrecs(mp, ifp->if_broot_bytes, 0) == 1); pp = XFS_BMAP_BROOT_PTR_ADDR(mp, rblock, 1, ifp->if_broot_bytes); cbno = be64_to_cpu(*pp); #ifdef DEBUG if (XFS_IS_CORRUPT(cur->bc_mp, !xfs_btree_check_lptr(cur, cbno, 1))) return -EFSCORRUPTED; #endif error = xfs_btree_read_bufl(mp, tp, cbno, &cbp, XFS_BMAP_BTREE_REF, &xfs_bmbt_buf_ops); if (error) return error; cblock = XFS_BUF_TO_BLOCK(cbp); if ((error = xfs_btree_check_block(cur, cblock, 0, cbp))) return error; xfs_rmap_ino_bmbt_owner(&oinfo, ip->i_ino, whichfork); error = xfs_free_extent_later(cur->bc_tp, cbno, 1, &oinfo, XFS_AG_RESV_NONE, false); if (error) return error; ip->i_nblocks--; xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_BCOUNT, -1L); xfs_trans_binval(tp, cbp); if (cur->bc_levels[0].bp == cbp) cur->bc_levels[0].bp = NULL; xfs_iroot_realloc(ip, -1, whichfork); ASSERT(ifp->if_broot == NULL); ifp->if_format = XFS_DINODE_FMT_EXTENTS; *logflagsp |= XFS_ILOG_CORE | xfs_ilog_fext(whichfork); return 0; } /* * Convert an extents-format file into a btree-format file. * The new file will have a root block (in the inode) and a single child block. */ STATIC int /* error */ xfs_bmap_extents_to_btree( struct xfs_trans *tp, /* transaction pointer */ struct xfs_inode *ip, /* incore inode pointer */ struct xfs_btree_cur **curp, /* cursor returned to caller */ int wasdel, /* converting a delayed alloc */ int *logflagsp, /* inode logging flags */ int whichfork) /* data or attr fork */ { struct xfs_btree_block *ablock; /* allocated (child) bt block */ struct xfs_buf *abp; /* buffer for ablock */ struct xfs_alloc_arg args; /* allocation arguments */ struct xfs_bmbt_rec *arp; /* child record pointer */ struct xfs_btree_block *block; /* btree root block */ struct xfs_btree_cur *cur; /* bmap btree cursor */ int error; /* error return value */ struct xfs_ifork *ifp; /* inode fork pointer */ struct xfs_bmbt_key *kp; /* root block key pointer */ struct xfs_mount *mp; /* mount structure */ xfs_bmbt_ptr_t *pp; /* root block address pointer */ struct xfs_iext_cursor icur; struct xfs_bmbt_irec rec; xfs_extnum_t cnt = 0; mp = ip->i_mount; ASSERT(whichfork != XFS_COW_FORK); ifp = xfs_ifork_ptr(ip, whichfork); ASSERT(ifp->if_format == XFS_DINODE_FMT_EXTENTS); /* * Make space in the inode incore. This needs to be undone if we fail * to expand the root. */ xfs_iroot_realloc(ip, 1, whichfork); /* * Fill in the root. */ block = ifp->if_broot; xfs_btree_init_block_int(mp, block, XFS_BUF_DADDR_NULL, XFS_BTNUM_BMAP, 1, 1, ip->i_ino, XFS_BTREE_LONG_PTRS); /* * Need a cursor. Can't allocate until bb_level is filled in. */ cur = xfs_bmbt_init_cursor(mp, tp, ip, whichfork); cur->bc_ino.flags = wasdel ? XFS_BTCUR_BMBT_WASDEL : 0; /* * Convert to a btree with two levels, one record in root. */ ifp->if_format = XFS_DINODE_FMT_BTREE; memset(&args, 0, sizeof(args)); args.tp = tp; args.mp = mp; xfs_rmap_ino_bmbt_owner(&args.oinfo, ip->i_ino, whichfork); args.minlen = args.maxlen = args.prod = 1; args.wasdel = wasdel; *logflagsp = 0; error = xfs_alloc_vextent_start_ag(&args, XFS_INO_TO_FSB(mp, ip->i_ino)); if (error) goto out_root_realloc; /* * Allocation can't fail, the space was reserved. */ if (WARN_ON_ONCE(args.fsbno == NULLFSBLOCK)) { error = -ENOSPC; goto out_root_realloc; } cur->bc_ino.allocated++; ip->i_nblocks++; xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_BCOUNT, 1L); error = xfs_trans_get_buf(tp, mp->m_ddev_targp, XFS_FSB_TO_DADDR(mp, args.fsbno), mp->m_bsize, 0, &abp); if (error) goto out_unreserve_dquot; /* * Fill in the child block. */ abp->b_ops = &xfs_bmbt_buf_ops; ablock = XFS_BUF_TO_BLOCK(abp); xfs_btree_init_block_int(mp, ablock, xfs_buf_daddr(abp), XFS_BTNUM_BMAP, 0, 0, ip->i_ino, XFS_BTREE_LONG_PTRS); for_each_xfs_iext(ifp, &icur, &rec) { if (isnullstartblock(rec.br_startblock)) continue; arp = XFS_BMBT_REC_ADDR(mp, ablock, 1 + cnt); xfs_bmbt_disk_set_all(arp, &rec); cnt++; } ASSERT(cnt == ifp->if_nextents); xfs_btree_set_numrecs(ablock, cnt); /* * Fill in the root key and pointer. */ kp = XFS_BMBT_KEY_ADDR(mp, block, 1); arp = XFS_BMBT_REC_ADDR(mp, ablock, 1); kp->br_startoff = cpu_to_be64(xfs_bmbt_disk_get_startoff(arp)); pp = XFS_BMBT_PTR_ADDR(mp, block, 1, xfs_bmbt_get_maxrecs(cur, be16_to_cpu(block->bb_level))); *pp = cpu_to_be64(args.fsbno); /* * Do all this logging at the end so that * the root is at the right level. */ xfs_btree_log_block(cur, abp, XFS_BB_ALL_BITS); xfs_btree_log_recs(cur, abp, 1, be16_to_cpu(ablock->bb_numrecs)); ASSERT(*curp == NULL); *curp = cur; *logflagsp = XFS_ILOG_CORE | xfs_ilog_fbroot(whichfork); return 0; out_unreserve_dquot: xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_BCOUNT, -1L); out_root_realloc: xfs_iroot_realloc(ip, -1, whichfork); ifp->if_format = XFS_DINODE_FMT_EXTENTS; ASSERT(ifp->if_broot == NULL); xfs_btree_del_cursor(cur, XFS_BTREE_ERROR); return error; } /* * Convert a local file to an extents file. * This code is out of bounds for data forks of regular files, * since the file data needs to get logged so things will stay consistent. * (The bmap-level manipulations are ok, though). */ void xfs_bmap_local_to_extents_empty( struct xfs_trans *tp, struct xfs_inode *ip, int whichfork) { struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork); ASSERT(whichfork != XFS_COW_FORK); ASSERT(ifp->if_format == XFS_DINODE_FMT_LOCAL); ASSERT(ifp->if_bytes == 0); ASSERT(ifp->if_nextents == 0); xfs_bmap_forkoff_reset(ip, whichfork); ifp->if_data = NULL; ifp->if_height = 0; ifp->if_format = XFS_DINODE_FMT_EXTENTS; xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); } STATIC int /* error */ xfs_bmap_local_to_extents( xfs_trans_t *tp, /* transaction pointer */ xfs_inode_t *ip, /* incore inode pointer */ xfs_extlen_t total, /* total blocks needed by transaction */ int *logflagsp, /* inode logging flags */ int whichfork, void (*init_fn)(struct xfs_trans *tp, struct xfs_buf *bp, struct xfs_inode *ip, struct xfs_ifork *ifp)) { int error = 0; int flags; /* logging flags returned */ struct xfs_ifork *ifp; /* inode fork pointer */ xfs_alloc_arg_t args; /* allocation arguments */ struct xfs_buf *bp; /* buffer for extent block */ struct xfs_bmbt_irec rec; struct xfs_iext_cursor icur; /* * We don't want to deal with the case of keeping inode data inline yet. * So sending the data fork of a regular inode is invalid. */ ASSERT(!(S_ISREG(VFS_I(ip)->i_mode) && whichfork == XFS_DATA_FORK)); ifp = xfs_ifork_ptr(ip, whichfork); ASSERT(ifp->if_format == XFS_DINODE_FMT_LOCAL); if (!ifp->if_bytes) { xfs_bmap_local_to_extents_empty(tp, ip, whichfork); flags = XFS_ILOG_CORE; goto done; } flags = 0; error = 0; memset(&args, 0, sizeof(args)); args.tp = tp; args.mp = ip->i_mount; args.total = total; args.minlen = args.maxlen = args.prod = 1; xfs_rmap_ino_owner(&args.oinfo, ip->i_ino, whichfork, 0); /* * Allocate a block. We know we need only one, since the * file currently fits in an inode. */ args.total = total; args.minlen = args.maxlen = args.prod = 1; error = xfs_alloc_vextent_start_ag(&args, XFS_INO_TO_FSB(args.mp, ip->i_ino)); if (error) goto done; /* Can't fail, the space was reserved. */ ASSERT(args.fsbno != NULLFSBLOCK); ASSERT(args.len == 1); error = xfs_trans_get_buf(tp, args.mp->m_ddev_targp, XFS_FSB_TO_DADDR(args.mp, args.fsbno), args.mp->m_bsize, 0, &bp); if (error) goto done; /* * Initialize the block, copy the data and log the remote buffer. * * The callout is responsible for logging because the remote format * might differ from the local format and thus we don't know how much to * log here. Note that init_fn must also set the buffer log item type * correctly. */ init_fn(tp, bp, ip, ifp); /* account for the change in fork size */ xfs_idata_realloc(ip, -ifp->if_bytes, whichfork); xfs_bmap_local_to_extents_empty(tp, ip, whichfork); flags |= XFS_ILOG_CORE; ifp->if_data = NULL; ifp->if_height = 0; rec.br_startoff = 0; rec.br_startblock = args.fsbno; rec.br_blockcount = 1; rec.br_state = XFS_EXT_NORM; xfs_iext_first(ifp, &icur); xfs_iext_insert(ip, &icur, &rec, 0); ifp->if_nextents = 1; ip->i_nblocks = 1; xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_BCOUNT, 1L); flags |= xfs_ilog_fext(whichfork); done: *logflagsp = flags; return error; } /* * Called from xfs_bmap_add_attrfork to handle btree format files. */ STATIC int /* error */ xfs_bmap_add_attrfork_btree( xfs_trans_t *tp, /* transaction pointer */ xfs_inode_t *ip, /* incore inode pointer */ int *flags) /* inode logging flags */ { struct xfs_btree_block *block = ip->i_df.if_broot; struct xfs_btree_cur *cur; /* btree cursor */ int error; /* error return value */ xfs_mount_t *mp; /* file system mount struct */ int stat; /* newroot status */ mp = ip->i_mount; if (XFS_BMAP_BMDR_SPACE(block) <= xfs_inode_data_fork_size(ip)) *flags |= XFS_ILOG_DBROOT; else { cur = xfs_bmbt_init_cursor(mp, tp, ip, XFS_DATA_FORK); error = xfs_bmbt_lookup_first(cur, &stat); if (error) goto error0; /* must be at least one entry */ if (XFS_IS_CORRUPT(mp, stat != 1)) { error = -EFSCORRUPTED; goto error0; } if ((error = xfs_btree_new_iroot(cur, flags, &stat))) goto error0; if (stat == 0) { xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR); return -ENOSPC; } cur->bc_ino.allocated = 0; xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR); } return 0; error0: xfs_btree_del_cursor(cur, XFS_BTREE_ERROR); return error; } /* * Called from xfs_bmap_add_attrfork to handle extents format files. */ STATIC int /* error */ xfs_bmap_add_attrfork_extents( struct xfs_trans *tp, /* transaction pointer */ struct xfs_inode *ip, /* incore inode pointer */ int *flags) /* inode logging flags */ { struct xfs_btree_cur *cur; /* bmap btree cursor */ int error; /* error return value */ if (ip->i_df.if_nextents * sizeof(struct xfs_bmbt_rec) <= xfs_inode_data_fork_size(ip)) return 0; cur = NULL; error = xfs_bmap_extents_to_btree(tp, ip, &cur, 0, flags, XFS_DATA_FORK); if (cur) { cur->bc_ino.allocated = 0; xfs_btree_del_cursor(cur, error); } return error; } /* * Called from xfs_bmap_add_attrfork to handle local format files. Each * different data fork content type needs a different callout to do the * conversion. Some are basic and only require special block initialisation * callouts for the data formating, others (directories) are so specialised they * handle everything themselves. * * XXX (dgc): investigate whether directory conversion can use the generic * formatting callout. It should be possible - it's just a very complex * formatter. */ STATIC int /* error */ xfs_bmap_add_attrfork_local( struct xfs_trans *tp, /* transaction pointer */ struct xfs_inode *ip, /* incore inode pointer */ int *flags) /* inode logging flags */ { struct xfs_da_args dargs; /* args for dir/attr code */ if (ip->i_df.if_bytes <= xfs_inode_data_fork_size(ip)) return 0; if (S_ISDIR(VFS_I(ip)->i_mode)) { memset(&dargs, 0, sizeof(dargs)); dargs.geo = ip->i_mount->m_dir_geo; dargs.dp = ip; dargs.total = dargs.geo->fsbcount; dargs.whichfork = XFS_DATA_FORK; dargs.trans = tp; return xfs_dir2_sf_to_block(&dargs); } if (S_ISLNK(VFS_I(ip)->i_mode)) return xfs_bmap_local_to_extents(tp, ip, 1, flags, XFS_DATA_FORK, xfs_symlink_local_to_remote); /* should only be called for types that support local format data */ ASSERT(0); return -EFSCORRUPTED; } /* * Set an inode attr fork offset based on the format of the data fork. */ static int xfs_bmap_set_attrforkoff( struct xfs_inode *ip, int size, int *version) { int default_size = xfs_default_attroffset(ip) >> 3; switch (ip->i_df.if_format) { case XFS_DINODE_FMT_DEV: ip->i_forkoff = default_size; break; case XFS_DINODE_FMT_LOCAL: case XFS_DINODE_FMT_EXTENTS: case XFS_DINODE_FMT_BTREE: ip->i_forkoff = xfs_attr_shortform_bytesfit(ip, size); if (!ip->i_forkoff) ip->i_forkoff = default_size; else if (xfs_has_attr2(ip->i_mount) && version) *version = 2; break; default: ASSERT(0); return -EINVAL; } return 0; } /* * Convert inode from non-attributed to attributed. * Must not be in a transaction, ip must not be locked. */ int /* error code */ xfs_bmap_add_attrfork( xfs_inode_t *ip, /* incore inode pointer */ int size, /* space new attribute needs */ int rsvd) /* xact may use reserved blks */ { xfs_mount_t *mp; /* mount structure */ xfs_trans_t *tp; /* transaction pointer */ int blks; /* space reservation */ int version = 1; /* superblock attr version */ int logflags; /* logging flags */ int error; /* error return value */ ASSERT(xfs_inode_has_attr_fork(ip) == 0); mp = ip->i_mount; ASSERT(!XFS_NOT_DQATTACHED(mp, ip)); blks = XFS_ADDAFORK_SPACE_RES(mp); error = xfs_trans_alloc_inode(ip, &M_RES(mp)->tr_addafork, blks, 0, rsvd, &tp); if (error) return error; if (xfs_inode_has_attr_fork(ip)) goto trans_cancel; xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); error = xfs_bmap_set_attrforkoff(ip, size, &version); if (error) goto trans_cancel; xfs_ifork_init_attr(ip, XFS_DINODE_FMT_EXTENTS, 0); logflags = 0; switch (ip->i_df.if_format) { case XFS_DINODE_FMT_LOCAL: error = xfs_bmap_add_attrfork_local(tp, ip, &logflags); break; case XFS_DINODE_FMT_EXTENTS: error = xfs_bmap_add_attrfork_extents(tp, ip, &logflags); break; case XFS_DINODE_FMT_BTREE: error = xfs_bmap_add_attrfork_btree(tp, ip, &logflags); break; default: error = 0; break; } if (logflags) xfs_trans_log_inode(tp, ip, logflags); if (error) goto trans_cancel; if (!xfs_has_attr(mp) || (!xfs_has_attr2(mp) && version == 2)) { bool log_sb = false; spin_lock(&mp->m_sb_lock); if (!xfs_has_attr(mp)) { xfs_add_attr(mp); log_sb = true; } if (!xfs_has_attr2(mp) && version == 2) { xfs_add_attr2(mp); log_sb = true; } spin_unlock(&mp->m_sb_lock); if (log_sb) xfs_log_sb(tp); } error = xfs_trans_commit(tp); xfs_iunlock(ip, XFS_ILOCK_EXCL); return error; trans_cancel: xfs_trans_cancel(tp); xfs_iunlock(ip, XFS_ILOCK_EXCL); return error; } /* * Internal and external extent tree search functions. */ struct xfs_iread_state { struct xfs_iext_cursor icur; xfs_extnum_t loaded; }; int xfs_bmap_complain_bad_rec( struct xfs_inode *ip, int whichfork, xfs_failaddr_t fa, const struct xfs_bmbt_irec *irec) { struct xfs_mount *mp = ip->i_mount; const char *forkname; switch (whichfork) { case XFS_DATA_FORK: forkname = "data"; break; case XFS_ATTR_FORK: forkname = "attr"; break; case XFS_COW_FORK: forkname = "CoW"; break; default: forkname = "???"; break; } xfs_warn(mp, "Bmap BTree record corruption in inode 0x%llx %s fork detected at %pS!", ip->i_ino, forkname, fa); xfs_warn(mp, "Offset 0x%llx, start block 0x%llx, block count 0x%llx state 0x%x", irec->br_startoff, irec->br_startblock, irec->br_blockcount, irec->br_state); return -EFSCORRUPTED; } /* Stuff every bmbt record from this block into the incore extent map. */ static int xfs_iread_bmbt_block( struct xfs_btree_cur *cur, int level, void *priv) { struct xfs_iread_state *ir = priv; struct xfs_mount *mp = cur->bc_mp; struct xfs_inode *ip = cur->bc_ino.ip; struct xfs_btree_block *block; struct xfs_buf *bp; struct xfs_bmbt_rec *frp; xfs_extnum_t num_recs; xfs_extnum_t j; int whichfork = cur->bc_ino.whichfork; struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork); block = xfs_btree_get_block(cur, level, &bp); /* Abort if we find more records than nextents. */ num_recs = xfs_btree_get_numrecs(block); if (unlikely(ir->loaded + num_recs > ifp->if_nextents)) { xfs_warn(ip->i_mount, "corrupt dinode %llu, (btree extents).", (unsigned long long)ip->i_ino); xfs_inode_verifier_error(ip, -EFSCORRUPTED, __func__, block, sizeof(*block), __this_address); return -EFSCORRUPTED; } /* Copy records into the incore cache. */ frp = XFS_BMBT_REC_ADDR(mp, block, 1); for (j = 0; j < num_recs; j++, frp++, ir->loaded++) { struct xfs_bmbt_irec new; xfs_failaddr_t fa; xfs_bmbt_disk_get_all(frp, &new); fa = xfs_bmap_validate_extent(ip, whichfork, &new); if (fa) { xfs_inode_verifier_error(ip, -EFSCORRUPTED, "xfs_iread_extents(2)", frp, sizeof(*frp), fa); return xfs_bmap_complain_bad_rec(ip, whichfork, fa, &new); } xfs_iext_insert(ip, &ir->icur, &new, xfs_bmap_fork_to_state(whichfork)); trace_xfs_read_extent(ip, &ir->icur, xfs_bmap_fork_to_state(whichfork), _THIS_IP_); xfs_iext_next(ifp, &ir->icur); } return 0; } /* * Read in extents from a btree-format inode. */ int xfs_iread_extents( struct xfs_trans *tp, struct xfs_inode *ip, int whichfork) { struct xfs_iread_state ir; struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork); struct xfs_mount *mp = ip->i_mount; struct xfs_btree_cur *cur; int error; if (!xfs_need_iread_extents(ifp)) return 0; ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL)); ir.loaded = 0; xfs_iext_first(ifp, &ir.icur); cur = xfs_bmbt_init_cursor(mp, tp, ip, whichfork); error = xfs_btree_visit_blocks(cur, xfs_iread_bmbt_block, XFS_BTREE_VISIT_RECORDS, &ir); xfs_btree_del_cursor(cur, error); if (error) goto out; if (XFS_IS_CORRUPT(mp, ir.loaded != ifp->if_nextents)) { error = -EFSCORRUPTED; goto out; } ASSERT(ir.loaded == xfs_iext_count(ifp)); /* * Use release semantics so that we can use acquire semantics in * xfs_need_iread_extents and be guaranteed to see a valid mapping tree * after that load. */ smp_store_release(&ifp->if_needextents, 0); return 0; out: xfs_iext_destroy(ifp); return error; } /* * Returns the relative block number of the first unused block(s) in the given * fork with at least "len" logically contiguous blocks free. This is the * lowest-address hole if the fork has holes, else the first block past the end * of fork. Return 0 if the fork is currently local (in-inode). */ int /* error */ xfs_bmap_first_unused( struct xfs_trans *tp, /* transaction pointer */ struct xfs_inode *ip, /* incore inode */ xfs_extlen_t len, /* size of hole to find */ xfs_fileoff_t *first_unused, /* unused block */ int whichfork) /* data or attr fork */ { struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork); struct xfs_bmbt_irec got; struct xfs_iext_cursor icur; xfs_fileoff_t lastaddr = 0; xfs_fileoff_t lowest, max; int error; if (ifp->if_format == XFS_DINODE_FMT_LOCAL) { *first_unused = 0; return 0; } ASSERT(xfs_ifork_has_extents(ifp)); error = xfs_iread_extents(tp, ip, whichfork); if (error) return error; lowest = max = *first_unused; for_each_xfs_iext(ifp, &icur, &got) { /* * See if the hole before this extent will work. */ if (got.br_startoff >= lowest + len && got.br_startoff - max >= len) break; lastaddr = got.br_startoff + got.br_blockcount; max = XFS_FILEOFF_MAX(lastaddr, lowest); } *first_unused = max; return 0; } /* * Returns the file-relative block number of the last block - 1 before * last_block (input value) in the file. * This is not based on i_size, it is based on the extent records. * Returns 0 for local files, as they do not have extent records. */ int /* error */ xfs_bmap_last_before( struct xfs_trans *tp, /* transaction pointer */ struct xfs_inode *ip, /* incore inode */ xfs_fileoff_t *last_block, /* last block */ int whichfork) /* data or attr fork */ { struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork); struct xfs_bmbt_irec got; struct xfs_iext_cursor icur; int error; switch (ifp->if_format) { case XFS_DINODE_FMT_LOCAL: *last_block = 0; return 0; case XFS_DINODE_FMT_BTREE: case XFS_DINODE_FMT_EXTENTS: break; default: ASSERT(0); return -EFSCORRUPTED; } error = xfs_iread_extents(tp, ip, whichfork); if (error) return error; if (!xfs_iext_lookup_extent_before(ip, ifp, last_block, &icur, &got)) *last_block = 0; return 0; } int xfs_bmap_last_extent( struct xfs_trans *tp, struct xfs_inode *ip, int whichfork, struct xfs_bmbt_irec *rec, int *is_empty) { struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork); struct xfs_iext_cursor icur; int error; error = xfs_iread_extents(tp, ip, whichfork); if (error) return error; xfs_iext_last(ifp, &icur); if (!xfs_iext_get_extent(ifp, &icur, rec)) *is_empty = 1; else *is_empty = 0; return 0; } /* * Check the last inode extent to determine whether this allocation will result * in blocks being allocated at the end of the file. When we allocate new data * blocks at the end of the file which do not start at the previous data block, * we will try to align the new blocks at stripe unit boundaries. * * Returns 1 in bma->aeof if the file (fork) is empty as any new write will be * at, or past the EOF. */ STATIC int xfs_bmap_isaeof( struct xfs_bmalloca *bma, int whichfork) { struct xfs_bmbt_irec rec; int is_empty; int error; bma->aeof = false; error = xfs_bmap_last_extent(NULL, bma->ip, whichfork, &rec, &is_empty); if (error) return error; if (is_empty) { bma->aeof = true; return 0; } /* * Check if we are allocation or past the last extent, or at least into * the last delayed allocated extent. */ bma->aeof = bma->offset >= rec.br_startoff + rec.br_blockcount || (bma->offset >= rec.br_startoff && isnullstartblock(rec.br_startblock)); return 0; } /* * Returns the file-relative block number of the first block past eof in * the file. This is not based on i_size, it is based on the extent records. * Returns 0 for local files, as they do not have extent records. */ int xfs_bmap_last_offset( struct xfs_inode *ip, xfs_fileoff_t *last_block, int whichfork) { struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork); struct xfs_bmbt_irec rec; int is_empty; int error; *last_block = 0; if (ifp->if_format == XFS_DINODE_FMT_LOCAL) return 0; if (XFS_IS_CORRUPT(ip->i_mount, !xfs_ifork_has_extents(ifp))) return -EFSCORRUPTED; error = xfs_bmap_last_extent(NULL, ip, whichfork, &rec, &is_empty); if (error || is_empty) return error; *last_block = rec.br_startoff + rec.br_blockcount; return 0; } /* * Extent tree manipulation functions used during allocation. */ /* * Convert a delayed allocation to a real allocation. */ STATIC int /* error */ xfs_bmap_add_extent_delay_real( struct xfs_bmalloca *bma, int whichfork) { struct xfs_mount *mp = bma->ip->i_mount; struct xfs_ifork *ifp = xfs_ifork_ptr(bma->ip, whichfork); struct xfs_bmbt_irec *new = &bma->got; int error; /* error return value */ int i; /* temp state */ xfs_fileoff_t new_endoff; /* end offset of new entry */ xfs_bmbt_irec_t r[3]; /* neighbor extent entries */ /* left is 0, right is 1, prev is 2 */ int rval=0; /* return value (logging flags) */ uint32_t state = xfs_bmap_fork_to_state(whichfork); xfs_filblks_t da_new; /* new count del alloc blocks used */ xfs_filblks_t da_old; /* old count del alloc blocks used */ xfs_filblks_t temp=0; /* value for da_new calculations */ int tmp_rval; /* partial logging flags */ struct xfs_bmbt_irec old; ASSERT(whichfork != XFS_ATTR_FORK); ASSERT(!isnullstartblock(new->br_startblock)); ASSERT(!bma->cur || (bma->cur->bc_ino.flags & XFS_BTCUR_BMBT_WASDEL)); XFS_STATS_INC(mp, xs_add_exlist); #define LEFT r[0] #define RIGHT r[1] #define PREV r[2] /* * Set up a bunch of variables to make the tests simpler. */ xfs_iext_get_extent(ifp, &bma->icur, &PREV); new_endoff = new->br_startoff + new->br_blockcount; ASSERT(isnullstartblock(PREV.br_startblock)); ASSERT(PREV.br_startoff <= new->br_startoff); ASSERT(PREV.br_startoff + PREV.br_blockcount >= new_endoff); da_old = startblockval(PREV.br_startblock); da_new = 0; /* * Set flags determining what part of the previous delayed allocation * extent is being replaced by a real allocation. */ if (PREV.br_startoff == new->br_startoff) state |= BMAP_LEFT_FILLING; if (PREV.br_startoff + PREV.br_blockcount == new_endoff) state |= BMAP_RIGHT_FILLING; /* * Check and set flags if this segment has a left neighbor. * Don't set contiguous if the combined extent would be too large. */ if (xfs_iext_peek_prev_extent(ifp, &bma->icur, &LEFT)) { state |= BMAP_LEFT_VALID; if (isnullstartblock(LEFT.br_startblock)) state |= BMAP_LEFT_DELAY; } if ((state & BMAP_LEFT_VALID) && !(state & BMAP_LEFT_DELAY) && LEFT.br_startoff + LEFT.br_blockcount == new->br_startoff && LEFT.br_startblock + LEFT.br_blockcount == new->br_startblock && LEFT.br_state == new->br_state && LEFT.br_blockcount + new->br_blockcount <= XFS_MAX_BMBT_EXTLEN) state |= BMAP_LEFT_CONTIG; /* * Check and set flags if this segment has a right neighbor. * Don't set contiguous if the combined extent would be too large. * Also check for all-three-contiguous being too large. */ if (xfs_iext_peek_next_extent(ifp, &bma->icur, &RIGHT)) { state |= BMAP_RIGHT_VALID; if (isnullstartblock(RIGHT.br_startblock)) state |= BMAP_RIGHT_DELAY; } if ((state & BMAP_RIGHT_VALID) && !(state & BMAP_RIGHT_DELAY) && new_endoff == RIGHT.br_startoff && new->br_startblock + new->br_blockcount == RIGHT.br_startblock && new->br_state == RIGHT.br_state && new->br_blockcount + RIGHT.br_blockcount <= XFS_MAX_BMBT_EXTLEN && ((state & (BMAP_LEFT_CONTIG | BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING)) != (BMAP_LEFT_CONTIG | BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING) || LEFT.br_blockcount + new->br_blockcount + RIGHT.br_blockcount <= XFS_MAX_BMBT_EXTLEN)) state |= BMAP_RIGHT_CONTIG; error = 0; /* * Switch out based on the FILLING and CONTIG state bits. */ switch (state & (BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG | BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG)) { case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG | BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG: /* * Filling in all of a previously delayed allocation extent. * The left and right neighbors are both contiguous with new. */ LEFT.br_blockcount += PREV.br_blockcount + RIGHT.br_blockcount; xfs_iext_remove(bma->ip, &bma->icur, state); xfs_iext_remove(bma->ip, &bma->icur, state); xfs_iext_prev(ifp, &bma->icur); xfs_iext_update_extent(bma->ip, state, &bma->icur, &LEFT); ifp->if_nextents--; if (bma->cur == NULL) rval = XFS_ILOG_CORE | XFS_ILOG_DEXT; else { rval = XFS_ILOG_CORE; error = xfs_bmbt_lookup_eq(bma->cur, &RIGHT, &i); if (error) goto done; if (XFS_IS_CORRUPT(mp, i != 1)) { error = -EFSCORRUPTED; goto done; } error = xfs_btree_delete(bma->cur, &i); if (error) goto done; if (XFS_IS_CORRUPT(mp, i != 1)) { error = -EFSCORRUPTED; goto done; } error = xfs_btree_decrement(bma->cur, 0, &i); if (error) goto done; if (XFS_IS_CORRUPT(mp, i != 1)) { error = -EFSCORRUPTED; goto done; } error = xfs_bmbt_update(bma->cur, &LEFT); if (error) goto done; } break; case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG: /* * Filling in all of a previously delayed allocation extent. * The left neighbor is contiguous, the right is not. */ old = LEFT; LEFT.br_blockcount += PREV.br_blockcount; xfs_iext_remove(bma->ip, &bma->icur, state); xfs_iext_prev(ifp, &bma->icur); xfs_iext_update_extent(bma->ip, state, &bma->icur, &LEFT); if (bma->cur == NULL) rval = XFS_ILOG_DEXT; else { rval = 0; error = xfs_bmbt_lookup_eq(bma->cur, &old, &i); if (error) goto done; if (XFS_IS_CORRUPT(mp, i != 1)) { error = -EFSCORRUPTED; goto done; } error = xfs_bmbt_update(bma->cur, &LEFT); if (error) goto done; } break; case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG: /* * Filling in all of a previously delayed allocation extent. * The right neighbor is contiguous, the left is not. Take care * with delay -> unwritten extent allocation here because the * delalloc record we are overwriting is always written. */ PREV.br_startblock = new->br_startblock; PREV.br_blockcount += RIGHT.br_blockcount; PREV.br_state = new->br_state; xfs_iext_next(ifp, &bma->icur); xfs_iext_remove(bma->ip, &bma->icur, state); xfs_iext_prev(ifp, &bma->icur); xfs_iext_update_extent(bma->ip, state, &bma->icur, &PREV); if (bma->cur == NULL) rval = XFS_ILOG_DEXT; else { rval = 0; error = xfs_bmbt_lookup_eq(bma->cur, &RIGHT, &i); if (error) goto done; if (XFS_IS_CORRUPT(mp, i != 1)) { error = -EFSCORRUPTED; goto done; } error = xfs_bmbt_update(bma->cur, &PREV); if (error) goto done; } break; case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING: /* * Filling in all of a previously delayed allocation extent. * Neither the left nor right neighbors are contiguous with * the new one. */ PREV.br_startblock = new->br_startblock; PREV.br_state = new->br_state; xfs_iext_update_extent(bma->ip, state, &bma->icur, &PREV); ifp->if_nextents++; if (bma->cur == NULL) rval = XFS_ILOG_CORE | XFS_ILOG_DEXT; else { rval = XFS_ILOG_CORE; error = xfs_bmbt_lookup_eq(bma->cur, new, &i); if (error) goto done; if (XFS_IS_CORRUPT(mp, i != 0)) { error = -EFSCORRUPTED; goto done; } error = xfs_btree_insert(bma->cur, &i); if (error) goto done; if (XFS_IS_CORRUPT(mp, i != 1)) { error = -EFSCORRUPTED; goto done; } } break; case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG: /* * Filling in the first part of a previous delayed allocation. * The left neighbor is contiguous. */ old = LEFT; temp = PREV.br_blockcount - new->br_blockcount; da_new = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(bma->ip, temp), startblockval(PREV.br_startblock)); LEFT.br_blockcount += new->br_blockcount; PREV.br_blockcount = temp; PREV.br_startoff += new->br_blockcount; PREV.br_startblock = nullstartblock(da_new); xfs_iext_update_extent(bma->ip, state, &bma->icur, &PREV); xfs_iext_prev(ifp, &bma->icur); xfs_iext_update_extent(bma->ip, state, &bma->icur, &LEFT); if (bma->cur == NULL) rval = XFS_ILOG_DEXT; else { rval = 0; error = xfs_bmbt_lookup_eq(bma->cur, &old, &i); if (error) goto done; if (XFS_IS_CORRUPT(mp, i != 1)) { error = -EFSCORRUPTED; goto done; } error = xfs_bmbt_update(bma->cur, &LEFT); if (error) goto done; } break; case BMAP_LEFT_FILLING: /* * Filling in the first part of a previous delayed allocation. * The left neighbor is not contiguous. */ xfs_iext_update_extent(bma->ip, state, &bma->icur, new); ifp->if_nextents++; if (bma->cur == NULL) rval = XFS_ILOG_CORE | XFS_ILOG_DEXT; else { rval = XFS_ILOG_CORE; error = xfs_bmbt_lookup_eq(bma->cur, new, &i); if (error) goto done; if (XFS_IS_CORRUPT(mp, i != 0)) { error = -EFSCORRUPTED; goto done; } error = xfs_btree_insert(bma->cur, &i); if (error) goto done; if (XFS_IS_CORRUPT(mp, i != 1)) { error = -EFSCORRUPTED; goto done; } } if (xfs_bmap_needs_btree(bma->ip, whichfork)) { error = xfs_bmap_extents_to_btree(bma->tp, bma->ip, &bma->cur, 1, &tmp_rval, whichfork); rval |= tmp_rval; if (error) goto done; } temp = PREV.br_blockcount - new->br_blockcount; da_new = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(bma->ip, temp), startblockval(PREV.br_startblock) - (bma->cur ? bma->cur->bc_ino.allocated : 0)); PREV.br_startoff = new_endoff; PREV.br_blockcount = temp; PREV.br_startblock = nullstartblock(da_new); xfs_iext_next(ifp, &bma->icur); xfs_iext_insert(bma->ip, &bma->icur, &PREV, state); xfs_iext_prev(ifp, &bma->icur); break; case BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG: /* * Filling in the last part of a previous delayed allocation. * The right neighbor is contiguous with the new allocation. */ old = RIGHT; RIGHT.br_startoff = new->br_startoff; RIGHT.br_startblock = new->br_startblock; RIGHT.br_blockcount += new->br_blockcount; if (bma->cur == NULL) rval = XFS_ILOG_DEXT; else { rval = 0; error = xfs_bmbt_lookup_eq(bma->cur, &old, &i); if (error) goto done; if (XFS_IS_CORRUPT(mp, i != 1)) { error = -EFSCORRUPTED; goto done; } error = xfs_bmbt_update(bma->cur, &RIGHT); if (error) goto done; } temp = PREV.br_blockcount - new->br_blockcount; da_new = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(bma->ip, temp), startblockval(PREV.br_startblock)); PREV.br_blockcount = temp; PREV.br_startblock = nullstartblock(da_new); xfs_iext_update_extent(bma->ip, state, &bma->icur, &PREV); xfs_iext_next(ifp, &bma->icur); xfs_iext_update_extent(bma->ip, state, &bma->icur, &RIGHT); break; case BMAP_RIGHT_FILLING: /* * Filling in the last part of a previous delayed allocation. * The right neighbor is not contiguous. */ xfs_iext_update_extent(bma->ip, state, &bma->icur, new); ifp->if_nextents++; if (bma->cur == NULL) rval = XFS_ILOG_CORE | XFS_ILOG_DEXT; else { rval = XFS_ILOG_CORE; error = xfs_bmbt_lookup_eq(bma->cur, new, &i); if (error) goto done; if (XFS_IS_CORRUPT(mp, i != 0)) { error = -EFSCORRUPTED; goto done; } error = xfs_btree_insert(bma->cur, &i); if (error) goto done; if (XFS_IS_CORRUPT(mp, i != 1)) { error = -EFSCORRUPTED; goto done; } } if (xfs_bmap_needs_btree(bma->ip, whichfork)) { error = xfs_bmap_extents_to_btree(bma->tp, bma->ip, &bma->cur, 1, &tmp_rval, whichfork); rval |= tmp_rval; if (error) goto done; } temp = PREV.br_blockcount - new->br_blockcount; da_new = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(bma->ip, temp), startblockval(PREV.br_startblock) - (bma->cur ? bma->cur->bc_ino.allocated : 0)); PREV.br_startblock = nullstartblock(da_new); PREV.br_blockcount = temp; xfs_iext_insert(bma->ip, &bma->icur, &PREV, state); xfs_iext_next(ifp, &bma->icur); break; case 0: /* * Filling in the middle part of a previous delayed allocation. * Contiguity is impossible here. * This case is avoided almost all the time. * * We start with a delayed allocation: * * +ddddddddddddddddddddddddddddddddddddddddddddddddddddddd+ * PREV @ idx * * and we are allocating: * +rrrrrrrrrrrrrrrrr+ * new * * and we set it up for insertion as: * +ddddddddddddddddddd+rrrrrrrrrrrrrrrrr+ddddddddddddddddd+ * new * PREV @ idx LEFT RIGHT * inserted at idx + 1 */ old = PREV; /* LEFT is the new middle */ LEFT = *new; /* RIGHT is the new right */ RIGHT.br_state = PREV.br_state; RIGHT.br_startoff = new_endoff; RIGHT.br_blockcount = PREV.br_startoff + PREV.br_blockcount - new_endoff; RIGHT.br_startblock = nullstartblock(xfs_bmap_worst_indlen(bma->ip, RIGHT.br_blockcount)); /* truncate PREV */ PREV.br_blockcount = new->br_startoff - PREV.br_startoff; PREV.br_startblock = nullstartblock(xfs_bmap_worst_indlen(bma->ip, PREV.br_blockcount)); xfs_iext_update_extent(bma->ip, state, &bma->icur, &PREV); xfs_iext_next(ifp, &bma->icur); xfs_iext_insert(bma->ip, &bma->icur, &RIGHT, state); xfs_iext_insert(bma->ip, &bma->icur, &LEFT, state); ifp->if_nextents++; if (bma->cur == NULL) rval = XFS_ILOG_CORE | XFS_ILOG_DEXT; else { rval = XFS_ILOG_CORE; error = xfs_bmbt_lookup_eq(bma->cur, new, &i); if (error) goto done; if (XFS_IS_CORRUPT(mp, i != 0)) { error = -EFSCORRUPTED; goto done; } error = xfs_btree_insert(bma->cur, &i); if (error) goto done; if (XFS_IS_CORRUPT(mp, i != 1)) { error = -EFSCORRUPTED; goto done; } } if (xfs_bmap_needs_btree(bma->ip, whichfork)) { error = xfs_bmap_extents_to_btree(bma->tp, bma->ip, &bma->cur, 1, &tmp_rval, whichfork); rval |= tmp_rval; if (error) goto done; } da_new = startblockval(PREV.br_startblock) + startblockval(RIGHT.br_startblock); break; case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG: case BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG: case BMAP_LEFT_FILLING | BMAP_RIGHT_CONTIG: case BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG: case BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG: case BMAP_LEFT_CONTIG: case BMAP_RIGHT_CONTIG: /* * These cases are all impossible. */ ASSERT(0); } /* add reverse mapping unless caller opted out */ if (!(bma->flags & XFS_BMAPI_NORMAP)) xfs_rmap_map_extent(bma->tp, bma->ip, whichfork, new); /* convert to a btree if necessary */ if (xfs_bmap_needs_btree(bma->ip, whichfork)) { int tmp_logflags; /* partial log flag return val */ ASSERT(bma->cur == NULL); error = xfs_bmap_extents_to_btree(bma->tp, bma->ip, &bma->cur, da_old > 0, &tmp_logflags, whichfork); bma->logflags |= tmp_logflags; if (error) goto done; } if (da_new != da_old) xfs_mod_delalloc(mp, (int64_t)da_new - da_old); if (bma->cur) { da_new += bma->cur->bc_ino.allocated; bma->cur->bc_ino.allocated = 0; } /* adjust for changes in reserved delayed indirect blocks */ if (da_new != da_old) { ASSERT(state == 0 || da_new < da_old); error = xfs_mod_fdblocks(mp, (int64_t)(da_old - da_new), false); } xfs_bmap_check_leaf_extents(bma->cur, bma->ip, whichfork); done: if (whichfork != XFS_COW_FORK) bma->logflags |= rval; return error; #undef LEFT #undef RIGHT #undef PREV } /* * Convert an unwritten allocation to a real allocation or vice versa. */ int /* error */ xfs_bmap_add_extent_unwritten_real( struct xfs_trans *tp, xfs_inode_t *ip, /* incore inode pointer */ int whichfork, struct xfs_iext_cursor *icur, struct xfs_btree_cur **curp, /* if *curp is null, not a btree */ xfs_bmbt_irec_t *new, /* new data to add to file extents */ int *logflagsp) /* inode logging flags */ { struct xfs_btree_cur *cur; /* btree cursor */ int error; /* error return value */ int i; /* temp state */ struct xfs_ifork *ifp; /* inode fork pointer */ xfs_fileoff_t new_endoff; /* end offset of new entry */ xfs_bmbt_irec_t r[3]; /* neighbor extent entries */ /* left is 0, right is 1, prev is 2 */ int rval=0; /* return value (logging flags) */ uint32_t state = xfs_bmap_fork_to_state(whichfork); struct xfs_mount *mp = ip->i_mount; struct xfs_bmbt_irec old; *logflagsp = 0; cur = *curp; ifp = xfs_ifork_ptr(ip, whichfork); ASSERT(!isnullstartblock(new->br_startblock)); XFS_STATS_INC(mp, xs_add_exlist); #define LEFT r[0] #define RIGHT r[1] #define PREV r[2] /* * Set up a bunch of variables to make the tests simpler. */ error = 0; xfs_iext_get_extent(ifp, icur, &PREV); ASSERT(new->br_state != PREV.br_state); new_endoff = new->br_startoff + new->br_blockcount; ASSERT(PREV.br_startoff <= new->br_startoff); ASSERT(PREV.br_startoff + PREV.br_blockcount >= new_endoff); /* * Set flags determining what part of the previous oldext allocation * extent is being replaced by a newext allocation. */ if (PREV.br_startoff == new->br_startoff) state |= BMAP_LEFT_FILLING; if (PREV.br_startoff + PREV.br_blockcount == new_endoff) state |= BMAP_RIGHT_FILLING; /* * Check and set flags if this segment has a left neighbor. * Don't set contiguous if the combined extent would be too large. */ if (xfs_iext_peek_prev_extent(ifp, icur, &LEFT)) { state |= BMAP_LEFT_VALID; if (isnullstartblock(LEFT.br_startblock)) state |= BMAP_LEFT_DELAY; } if ((state & BMAP_LEFT_VALID) && !(state & BMAP_LEFT_DELAY) && LEFT.br_startoff + LEFT.br_blockcount == new->br_startoff && LEFT.br_startblock + LEFT.br_blockcount == new->br_startblock && LEFT.br_state == new->br_state && LEFT.br_blockcount + new->br_blockcount <= XFS_MAX_BMBT_EXTLEN) state |= BMAP_LEFT_CONTIG; /* * Check and set flags if this segment has a right neighbor. * Don't set contiguous if the combined extent would be too large. * Also check for all-three-contiguous being too large. */ if (xfs_iext_peek_next_extent(ifp, icur, &RIGHT)) { state |= BMAP_RIGHT_VALID; if (isnullstartblock(RIGHT.br_startblock)) state |= BMAP_RIGHT_DELAY; } if ((state & BMAP_RIGHT_VALID) && !(state & BMAP_RIGHT_DELAY) && new_endoff == RIGHT.br_startoff && new->br_startblock + new->br_blockcount == RIGHT.br_startblock && new->br_state == RIGHT.br_state && new->br_blockcount + RIGHT.br_blockcount <= XFS_MAX_BMBT_EXTLEN && ((state & (BMAP_LEFT_CONTIG | BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING)) != (BMAP_LEFT_CONTIG | BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING) || LEFT.br_blockcount + new->br_blockcount + RIGHT.br_blockcount <= XFS_MAX_BMBT_EXTLEN)) state |= BMAP_RIGHT_CONTIG; /* * Switch out based on the FILLING and CONTIG state bits. */ switch (state & (BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG | BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG)) { case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG | BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG: /* * Setting all of a previous oldext extent to newext. * The left and right neighbors are both contiguous with new. */ LEFT.br_blockcount += PREV.br_blockcount + RIGHT.br_blockcount; xfs_iext_remove(ip, icur, state); xfs_iext_remove(ip, icur, state); xfs_iext_prev(ifp, icur); xfs_iext_update_extent(ip, state, icur, &LEFT); ifp->if_nextents -= 2; if (cur == NULL) rval = XFS_ILOG_CORE | XFS_ILOG_DEXT; else { rval = XFS_ILOG_CORE; error = xfs_bmbt_lookup_eq(cur, &RIGHT, &i); if (error) goto done; if (XFS_IS_CORRUPT(mp, i != 1)) { error = -EFSCORRUPTED; goto done; } if ((error = xfs_btree_delete(cur, &i))) goto done; if (XFS_IS_CORRUPT(mp, i != 1)) { error = -EFSCORRUPTED; goto done; } if ((error = xfs_btree_decrement(cur, 0, &i))) goto done; if (XFS_IS_CORRUPT(mp, i != 1)) { error = -EFSCORRUPTED; goto done; } if ((error = xfs_btree_delete(cur, &i))) goto done; if (XFS_IS_CORRUPT(mp, i != 1)) { error = -EFSCORRUPTED; goto done; } if ((error = xfs_btree_decrement(cur, 0, &i))) goto done; if (XFS_IS_CORRUPT(mp, i != 1)) { error = -EFSCORRUPTED; goto done; } error = xfs_bmbt_update(cur, &LEFT); if (error) goto done; } break; case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG: /* * Setting all of a previous oldext extent to newext. * The left neighbor is contiguous, the right is not. */ LEFT.br_blockcount += PREV.br_blockcount; xfs_iext_remove(ip, icur, state); xfs_iext_prev(ifp, icur); xfs_iext_update_extent(ip, state, icur, &LEFT); ifp->if_nextents--; if (cur == NULL) rval = XFS_ILOG_CORE | XFS_ILOG_DEXT; else { rval = XFS_ILOG_CORE; error = xfs_bmbt_lookup_eq(cur, &PREV, &i); if (error) goto done; if (XFS_IS_CORRUPT(mp, i != 1)) { error = -EFSCORRUPTED; goto done; } if ((error = xfs_btree_delete(cur, &i))) goto done; if (XFS_IS_CORRUPT(mp, i != 1)) { error = -EFSCORRUPTED; goto done; } if ((error = xfs_btree_decrement(cur, 0, &i))) goto done; if (XFS_IS_CORRUPT(mp, i != 1)) { error = -EFSCORRUPTED; goto done; } error = xfs_bmbt_update(cur, &LEFT); if (error) goto done; } break; case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG: /* * Setting all of a previous oldext extent to newext. * The right neighbor is contiguous, the left is not. */ PREV.br_blockcount += RIGHT.br_blockcount; PREV.br_state = new->br_state; xfs_iext_next(ifp, icur); xfs_iext_remove(ip, icur, state); xfs_iext_prev(ifp, icur); xfs_iext_update_extent(ip, state, icur, &PREV); ifp->if_nextents--; if (cur == NULL) rval = XFS_ILOG_CORE | XFS_ILOG_DEXT; else { rval = XFS_ILOG_CORE; error = xfs_bmbt_lookup_eq(cur, &RIGHT, &i); if (error) goto done; if (XFS_IS_CORRUPT(mp, i != 1)) { error = -EFSCORRUPTED; goto done; } if ((error = xfs_btree_delete(cur, &i))) goto done; if (XFS_IS_CORRUPT(mp, i != 1)) { error = -EFSCORRUPTED; goto done; } if ((error = xfs_btree_decrement(cur, 0, &i))) goto done; if (XFS_IS_CORRUPT(mp, i != 1)) { error = -EFSCORRUPTED; goto done; } error = xfs_bmbt_update(cur, &PREV); if (error) goto done; } break; case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING: /* * Setting all of a previous oldext extent to newext. * Neither the left nor right neighbors are contiguous with * the new one. */ PREV.br_state = new->br_state; xfs_iext_update_extent(ip, state, icur, &PREV); if (cur == NULL) rval = XFS_ILOG_DEXT; else { rval = 0; error = xfs_bmbt_lookup_eq(cur, new, &i); if (error) goto done; if (XFS_IS_CORRUPT(mp, i != 1)) { error = -EFSCORRUPTED; goto done; } error = xfs_bmbt_update(cur, &PREV); if (error) goto done; } break; case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG: /* * Setting the first part of a previous oldext extent to newext. * The left neighbor is contiguous. */ LEFT.br_blockcount += new->br_blockcount; old = PREV; PREV.br_startoff += new->br_blockcount; PREV.br_startblock += new->br_blockcount; PREV.br_blockcount -= new->br_blockcount; xfs_iext_update_extent(ip, state, icur, &PREV); xfs_iext_prev(ifp, icur); xfs_iext_update_extent(ip, state, icur, &LEFT); if (cur == NULL) rval = XFS_ILOG_DEXT; else { rval = 0; error = xfs_bmbt_lookup_eq(cur, &old, &i); if (error) goto done; if (XFS_IS_CORRUPT(mp, i != 1)) { error = -EFSCORRUPTED; goto done; } error = xfs_bmbt_update(cur, &PREV); if (error) goto done; error = xfs_btree_decrement(cur, 0, &i); if (error) goto done; error = xfs_bmbt_update(cur, &LEFT); if (error) goto done; } break; case BMAP_LEFT_FILLING: /* * Setting the first part of a previous oldext extent to newext. * The left neighbor is not contiguous. */ old = PREV; PREV.br_startoff += new->br_blockcount; PREV.br_startblock += new->br_blockcount; PREV.br_blockcount -= new->br_blockcount; xfs_iext_update_extent(ip, state, icur, &PREV); xfs_iext_insert(ip, icur, new, state); ifp->if_nextents++; if (cur == NULL) rval = XFS_ILOG_CORE | XFS_ILOG_DEXT; else { rval = XFS_ILOG_CORE; error = xfs_bmbt_lookup_eq(cur, &old, &i); if (error) goto done; if (XFS_IS_CORRUPT(mp, i != 1)) { error = -EFSCORRUPTED; goto done; } error = xfs_bmbt_update(cur, &PREV); if (error) goto done; cur->bc_rec.b = *new; if ((error = xfs_btree_insert(cur, &i))) goto done; if (XFS_IS_CORRUPT(mp, i != 1)) { error = -EFSCORRUPTED; goto done; } } break; case BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG: /* * Setting the last part of a previous oldext extent to newext. * The right neighbor is contiguous with the new allocation. */ old = PREV; PREV.br_blockcount -= new->br_blockcount; RIGHT.br_startoff = new->br_startoff; RIGHT.br_startblock = new->br_startblock; RIGHT.br_blockcount += new->br_blockcount; xfs_iext_update_extent(ip, state, icur, &PREV); xfs_iext_next(ifp, icur); xfs_iext_update_extent(ip, state, icur, &RIGHT); if (cur == NULL) rval = XFS_ILOG_DEXT; else { rval = 0; error = xfs_bmbt_lookup_eq(cur, &old, &i); if (error) goto done; if (XFS_IS_CORRUPT(mp, i != 1)) { error = -EFSCORRUPTED; goto done; } error = xfs_bmbt_update(cur, &PREV); if (error) goto done; error = xfs_btree_increment(cur, 0, &i); if (error) goto done; error = xfs_bmbt_update(cur, &RIGHT); if (error) goto done; } break; case BMAP_RIGHT_FILLING: /* * Setting the last part of a previous oldext extent to newext. * The right neighbor is not contiguous. */ old = PREV; PREV.br_blockcount -= new->br_blockcount; xfs_iext_update_extent(ip, state, icur, &PREV); xfs_iext_next(ifp, icur); xfs_iext_insert(ip, icur, new, state); ifp->if_nextents++; if (cur == NULL) rval = XFS_ILOG_CORE | XFS_ILOG_DEXT; else { rval = XFS_ILOG_CORE; error = xfs_bmbt_lookup_eq(cur, &old, &i); if (error) goto done; if (XFS_IS_CORRUPT(mp, i != 1)) { error = -EFSCORRUPTED; goto done; } error = xfs_bmbt_update(cur, &PREV); if (error) goto done; error = xfs_bmbt_lookup_eq(cur, new, &i); if (error) goto done; if (XFS_IS_CORRUPT(mp, i != 0)) { error = -EFSCORRUPTED; goto done; } if ((error = xfs_btree_insert(cur, &i))) goto done; if (XFS_IS_CORRUPT(mp, i != 1)) { error = -EFSCORRUPTED; goto done; } } break; case 0: /* * Setting the middle part of a previous oldext extent to * newext. Contiguity is impossible here. * One extent becomes three extents. */ old = PREV; PREV.br_blockcount = new->br_startoff - PREV.br_startoff; r[0] = *new; r[1].br_startoff = new_endoff; r[1].br_blockcount = old.br_startoff + old.br_blockcount - new_endoff; r[1].br_startblock = new->br_startblock + new->br_blockcount; r[1].br_state = PREV.br_state; xfs_iext_update_extent(ip, state, icur, &PREV); xfs_iext_next(ifp, icur); xfs_iext_insert(ip, icur, &r[1], state); xfs_iext_insert(ip, icur, &r[0], state); ifp->if_nextents += 2; if (cur == NULL) rval = XFS_ILOG_CORE | XFS_ILOG_DEXT; else { rval = XFS_ILOG_CORE; error = xfs_bmbt_lookup_eq(cur, &old, &i); if (error) goto done; if (XFS_IS_CORRUPT(mp, i != 1)) { error = -EFSCORRUPTED; goto done; } /* new right extent - oldext */ error = xfs_bmbt_update(cur, &r[1]); if (error) goto done; /* new left extent - oldext */ cur->bc_rec.b = PREV; if ((error = xfs_btree_insert(cur, &i))) goto done; if (XFS_IS_CORRUPT(mp, i != 1)) { error = -EFSCORRUPTED; goto done; } /* * Reset the cursor to the position of the new extent * we are about to insert as we can't trust it after * the previous insert. */ error = xfs_bmbt_lookup_eq(cur, new, &i); if (error) goto done; if (XFS_IS_CORRUPT(mp, i != 0)) { error = -EFSCORRUPTED; goto done; } /* new middle extent - newext */ if ((error = xfs_btree_insert(cur, &i))) goto done; if (XFS_IS_CORRUPT(mp, i != 1)) { error = -EFSCORRUPTED; goto done; } } break; case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG: case BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG: case BMAP_LEFT_FILLING | BMAP_RIGHT_CONTIG: case BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG: case BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG: case BMAP_LEFT_CONTIG: case BMAP_RIGHT_CONTIG: /* * These cases are all impossible. */ ASSERT(0); } /* update reverse mappings */ xfs_rmap_convert_extent(mp, tp, ip, whichfork, new); /* convert to a btree if necessary */ if (xfs_bmap_needs_btree(ip, whichfork)) { int tmp_logflags; /* partial log flag return val */ ASSERT(cur == NULL); error = xfs_bmap_extents_to_btree(tp, ip, &cur, 0, &tmp_logflags, whichfork); *logflagsp |= tmp_logflags; if (error) goto done; } /* clear out the allocated field, done with it now in any case. */ if (cur) { cur->bc_ino.allocated = 0; *curp = cur; } xfs_bmap_check_leaf_extents(*curp, ip, whichfork); done: *logflagsp |= rval; return error; #undef LEFT #undef RIGHT #undef PREV } /* * Convert a hole to a delayed allocation. */ STATIC void xfs_bmap_add_extent_hole_delay( xfs_inode_t *ip, /* incore inode pointer */ int whichfork, struct xfs_iext_cursor *icur, xfs_bmbt_irec_t *new) /* new data to add to file extents */ { struct xfs_ifork *ifp; /* inode fork pointer */ xfs_bmbt_irec_t left; /* left neighbor extent entry */ xfs_filblks_t newlen=0; /* new indirect size */ xfs_filblks_t oldlen=0; /* old indirect size */ xfs_bmbt_irec_t right; /* right neighbor extent entry */ uint32_t state = xfs_bmap_fork_to_state(whichfork); xfs_filblks_t temp; /* temp for indirect calculations */ ifp = xfs_ifork_ptr(ip, whichfork); ASSERT(isnullstartblock(new->br_startblock)); /* * Check and set flags if this segment has a left neighbor */ if (xfs_iext_peek_prev_extent(ifp, icur, &left)) { state |= BMAP_LEFT_VALID; if (isnullstartblock(left.br_startblock)) state |= BMAP_LEFT_DELAY; } /* * Check and set flags if the current (right) segment exists. * If it doesn't exist, we're converting the hole at end-of-file. */ if (xfs_iext_get_extent(ifp, icur, &right)) { state |= BMAP_RIGHT_VALID; if (isnullstartblock(right.br_startblock)) state |= BMAP_RIGHT_DELAY; } /* * Set contiguity flags on the left and right neighbors. * Don't let extents get too large, even if the pieces are contiguous. */ if ((state & BMAP_LEFT_VALID) && (state & BMAP_LEFT_DELAY) && left.br_startoff + left.br_blockcount == new->br_startoff && left.br_blockcount + new->br_blockcount <= XFS_MAX_BMBT_EXTLEN) state |= BMAP_LEFT_CONTIG; if ((state & BMAP_RIGHT_VALID) && (state & BMAP_RIGHT_DELAY) && new->br_startoff + new->br_blockcount == right.br_startoff && new->br_blockcount + right.br_blockcount <= XFS_MAX_BMBT_EXTLEN && (!(state & BMAP_LEFT_CONTIG) || (left.br_blockcount + new->br_blockcount + right.br_blockcount <= XFS_MAX_BMBT_EXTLEN))) state |= BMAP_RIGHT_CONTIG; /* * Switch out based on the contiguity flags. */ switch (state & (BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG)) { case BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG: /* * New allocation is contiguous with delayed allocations * on the left and on the right. * Merge all three into a single extent record. */ temp = left.br_blockcount + new->br_blockcount + right.br_blockcount; oldlen = startblockval(left.br_startblock) + startblockval(new->br_startblock) + startblockval(right.br_startblock); newlen = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp), oldlen); left.br_startblock = nullstartblock(newlen); left.br_blockcount = temp; xfs_iext_remove(ip, icur, state); xfs_iext_prev(ifp, icur); xfs_iext_update_extent(ip, state, icur, &left); break; case BMAP_LEFT_CONTIG: /* * New allocation is contiguous with a delayed allocation * on the left. * Merge the new allocation with the left neighbor. */ temp = left.br_blockcount + new->br_blockcount; oldlen = startblockval(left.br_startblock) + startblockval(new->br_startblock); newlen = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp), oldlen); left.br_blockcount = temp; left.br_startblock = nullstartblock(newlen); xfs_iext_prev(ifp, icur); xfs_iext_update_extent(ip, state, icur, &left); break; case BMAP_RIGHT_CONTIG: /* * New allocation is contiguous with a delayed allocation * on the right. * Merge the new allocation with the right neighbor. */ temp = new->br_blockcount + right.br_blockcount; oldlen = startblockval(new->br_startblock) + startblockval(right.br_startblock); newlen = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp), oldlen); right.br_startoff = new->br_startoff; right.br_startblock = nullstartblock(newlen); right.br_blockcount = temp; xfs_iext_update_extent(ip, state, icur, &right); break; case 0: /* * New allocation is not contiguous with another * delayed allocation. * Insert a new entry. */ oldlen = newlen = 0; xfs_iext_insert(ip, icur, new, state); break; } if (oldlen != newlen) { ASSERT(oldlen > newlen); xfs_mod_fdblocks(ip->i_mount, (int64_t)(oldlen - newlen), false); /* * Nothing to do for disk quota accounting here. */ xfs_mod_delalloc(ip->i_mount, (int64_t)newlen - oldlen); } } /* * Convert a hole to a real allocation. */ STATIC int /* error */ xfs_bmap_add_extent_hole_real( struct xfs_trans *tp, struct xfs_inode *ip, int whichfork, struct xfs_iext_cursor *icur, struct xfs_btree_cur **curp, struct xfs_bmbt_irec *new, int *logflagsp, uint32_t flags) { struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork); struct xfs_mount *mp = ip->i_mount; struct xfs_btree_cur *cur = *curp; int error; /* error return value */ int i; /* temp state */ xfs_bmbt_irec_t left; /* left neighbor extent entry */ xfs_bmbt_irec_t right; /* right neighbor extent entry */ int rval=0; /* return value (logging flags) */ uint32_t state = xfs_bmap_fork_to_state(whichfork); struct xfs_bmbt_irec old; ASSERT(!isnullstartblock(new->br_startblock)); ASSERT(!cur || !(cur->bc_ino.flags & XFS_BTCUR_BMBT_WASDEL)); XFS_STATS_INC(mp, xs_add_exlist); /* * Check and set flags if this segment has a left neighbor. */ if (xfs_iext_peek_prev_extent(ifp, icur, &left)) { state |= BMAP_LEFT_VALID; if (isnullstartblock(left.br_startblock)) state |= BMAP_LEFT_DELAY; } /* * Check and set flags if this segment has a current value. * Not true if we're inserting into the "hole" at eof. */ if (xfs_iext_get_extent(ifp, icur, &right)) { state |= BMAP_RIGHT_VALID; if (isnullstartblock(right.br_startblock)) state |= BMAP_RIGHT_DELAY; } /* * We're inserting a real allocation between "left" and "right". * Set the contiguity flags. Don't let extents get too large. */ if ((state & BMAP_LEFT_VALID) && !(state & BMAP_LEFT_DELAY) && left.br_startoff + left.br_blockcount == new->br_startoff && left.br_startblock + left.br_blockcount == new->br_startblock && left.br_state == new->br_state && left.br_blockcount + new->br_blockcount <= XFS_MAX_BMBT_EXTLEN) state |= BMAP_LEFT_CONTIG; if ((state & BMAP_RIGHT_VALID) && !(state & BMAP_RIGHT_DELAY) && new->br_startoff + new->br_blockcount == right.br_startoff && new->br_startblock + new->br_blockcount == right.br_startblock && new->br_state == right.br_state && new->br_blockcount + right.br_blockcount <= XFS_MAX_BMBT_EXTLEN && (!(state & BMAP_LEFT_CONTIG) || left.br_blockcount + new->br_blockcount + right.br_blockcount <= XFS_MAX_BMBT_EXTLEN)) state |= BMAP_RIGHT_CONTIG; error = 0; /* * Select which case we're in here, and implement it. */ switch (state & (BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG)) { case BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG: /* * New allocation is contiguous with real allocations on the * left and on the right. * Merge all three into a single extent record. */ left.br_blockcount += new->br_blockcount + right.br_blockcount; xfs_iext_remove(ip, icur, state); xfs_iext_prev(ifp, icur); xfs_iext_update_extent(ip, state, icur, &left); ifp->if_nextents--; if (cur == NULL) { rval = XFS_ILOG_CORE | xfs_ilog_fext(whichfork); } else { rval = XFS_ILOG_CORE; error = xfs_bmbt_lookup_eq(cur, &right, &i); if (error) goto done; if (XFS_IS_CORRUPT(mp, i != 1)) { error = -EFSCORRUPTED; goto done; } error = xfs_btree_delete(cur, &i); if (error) goto done; if (XFS_IS_CORRUPT(mp, i != 1)) { error = -EFSCORRUPTED; goto done; } error = xfs_btree_decrement(cur, 0, &i); if (error) goto done; if (XFS_IS_CORRUPT(mp, i != 1)) { error = -EFSCORRUPTED; goto done; } error = xfs_bmbt_update(cur, &left); if (error) goto done; } break; case BMAP_LEFT_CONTIG: /* * New allocation is contiguous with a real allocation * on the left. * Merge the new allocation with the left neighbor. */ old = left; left.br_blockcount += new->br_blockcount; xfs_iext_prev(ifp, icur); xfs_iext_update_extent(ip, state, icur, &left); if (cur == NULL) { rval = xfs_ilog_fext(whichfork); } else { rval = 0; error = xfs_bmbt_lookup_eq(cur, &old, &i); if (error) goto done; if (XFS_IS_CORRUPT(mp, i != 1)) { error = -EFSCORRUPTED; goto done; } error = xfs_bmbt_update(cur, &left); if (error) goto done; } break; case BMAP_RIGHT_CONTIG: /* * New allocation is contiguous with a real allocation * on the right. * Merge the new allocation with the right neighbor. */ old = right; right.br_startoff = new->br_startoff; right.br_startblock = new->br_startblock; right.br_blockcount += new->br_blockcount; xfs_iext_update_extent(ip, state, icur, &right); if (cur == NULL) { rval = xfs_ilog_fext(whichfork); } else { rval = 0; error = xfs_bmbt_lookup_eq(cur, &old, &i); if (error) goto done; if (XFS_IS_CORRUPT(mp, i != 1)) { error = -EFSCORRUPTED; goto done; } error = xfs_bmbt_update(cur, &right); if (error) goto done; } break; case 0: /* * New allocation is not contiguous with another * real allocation. * Insert a new entry. */ xfs_iext_insert(ip, icur, new, state); ifp->if_nextents++; if (cur == NULL) { rval = XFS_ILOG_CORE | xfs_ilog_fext(whichfork); } else { rval = XFS_ILOG_CORE; error = xfs_bmbt_lookup_eq(cur, new, &i); if (error) goto done; if (XFS_IS_CORRUPT(mp, i != 0)) { error = -EFSCORRUPTED; goto done; } error = xfs_btree_insert(cur, &i); if (error) goto done; if (XFS_IS_CORRUPT(mp, i != 1)) { error = -EFSCORRUPTED; goto done; } } break; } /* add reverse mapping unless caller opted out */ if (!(flags & XFS_BMAPI_NORMAP)) xfs_rmap_map_extent(tp, ip, whichfork, new); /* convert to a btree if necessary */ if (xfs_bmap_needs_btree(ip, whichfork)) { int tmp_logflags; /* partial log flag return val */ ASSERT(cur == NULL); error = xfs_bmap_extents_to_btree(tp, ip, curp, 0, &tmp_logflags, whichfork); *logflagsp |= tmp_logflags; cur = *curp; if (error) goto done; } /* clear out the allocated field, done with it now in any case. */ if (cur) cur->bc_ino.allocated = 0; xfs_bmap_check_leaf_extents(cur, ip, whichfork); done: *logflagsp |= rval; return error; } /* * Functions used in the extent read, allocate and remove paths */ /* * Adjust the size of the new extent based on i_extsize and rt extsize. */ int xfs_bmap_extsize_align( xfs_mount_t *mp, xfs_bmbt_irec_t *gotp, /* next extent pointer */ xfs_bmbt_irec_t *prevp, /* previous extent pointer */ xfs_extlen_t extsz, /* align to this extent size */ int rt, /* is this a realtime inode? */ int eof, /* is extent at end-of-file? */ int delay, /* creating delalloc extent? */ int convert, /* overwriting unwritten extent? */ xfs_fileoff_t *offp, /* in/out: aligned offset */ xfs_extlen_t *lenp) /* in/out: aligned length */ { xfs_fileoff_t orig_off; /* original offset */ xfs_extlen_t orig_alen; /* original length */ xfs_fileoff_t orig_end; /* original off+len */ xfs_fileoff_t nexto; /* next file offset */ xfs_fileoff_t prevo; /* previous file offset */ xfs_fileoff_t align_off; /* temp for offset */ xfs_extlen_t align_alen; /* temp for length */ xfs_extlen_t temp; /* temp for calculations */ if (convert) return 0; orig_off = align_off = *offp; orig_alen = align_alen = *lenp; orig_end = orig_off + orig_alen; /* * If this request overlaps an existing extent, then don't * attempt to perform any additional alignment. */ if (!delay && !eof && (orig_off >= gotp->br_startoff) && (orig_end <= gotp->br_startoff + gotp->br_blockcount)) { return 0; } /* * If the file offset is unaligned vs. the extent size * we need to align it. This will be possible unless * the file was previously written with a kernel that didn't * perform this alignment, or if a truncate shot us in the * foot. */ div_u64_rem(orig_off, extsz, &temp); if (temp) { align_alen += temp; align_off -= temp; } /* Same adjustment for the end of the requested area. */ temp = (align_alen % extsz); if (temp) align_alen += extsz - temp; /* * For large extent hint sizes, the aligned extent might be larger than * XFS_BMBT_MAX_EXTLEN. In that case, reduce the size by an extsz so * that it pulls the length back under XFS_BMBT_MAX_EXTLEN. The outer * allocation loops handle short allocation just fine, so it is safe to * do this. We only want to do it when we are forced to, though, because * it means more allocation operations are required. */ while (align_alen > XFS_MAX_BMBT_EXTLEN) align_alen -= extsz; ASSERT(align_alen <= XFS_MAX_BMBT_EXTLEN); /* * If the previous block overlaps with this proposed allocation * then move the start forward without adjusting the length. */ if (prevp->br_startoff != NULLFILEOFF) { if (prevp->br_startblock == HOLESTARTBLOCK) prevo = prevp->br_startoff; else prevo = prevp->br_startoff + prevp->br_blockcount; } else prevo = 0; if (align_off != orig_off && align_off < prevo) align_off = prevo; /* * If the next block overlaps with this proposed allocation * then move the start back without adjusting the length, * but not before offset 0. * This may of course make the start overlap previous block, * and if we hit the offset 0 limit then the next block * can still overlap too. */ if (!eof && gotp->br_startoff != NULLFILEOFF) { if ((delay && gotp->br_startblock == HOLESTARTBLOCK) || (!delay && gotp->br_startblock == DELAYSTARTBLOCK)) nexto = gotp->br_startoff + gotp->br_blockcount; else nexto = gotp->br_startoff; } else nexto = NULLFILEOFF; if (!eof && align_off + align_alen != orig_end && align_off + align_alen > nexto) align_off = nexto > align_alen ? nexto - align_alen : 0; /* * If we're now overlapping the next or previous extent that * means we can't fit an extsz piece in this hole. Just move * the start forward to the first valid spot and set * the length so we hit the end. */ if (align_off != orig_off && align_off < prevo) align_off = prevo; if (align_off + align_alen != orig_end && align_off + align_alen > nexto && nexto != NULLFILEOFF) { ASSERT(nexto > prevo); align_alen = nexto - align_off; } /* * If realtime, and the result isn't a multiple of the realtime * extent size we need to remove blocks until it is. */ if (rt && (temp = xfs_extlen_to_rtxmod(mp, align_alen))) { /* * We're not covering the original request, or * we won't be able to once we fix the length. */ if (orig_off < align_off || orig_end > align_off + align_alen || align_alen - temp < orig_alen) return -EINVAL; /* * Try to fix it by moving the start up. */ if (align_off + temp <= orig_off) { align_alen -= temp; align_off += temp; } /* * Try to fix it by moving the end in. */ else if (align_off + align_alen - temp >= orig_end) align_alen -= temp; /* * Set the start to the minimum then trim the length. */ else { align_alen -= orig_off - align_off; align_off = orig_off; align_alen -= xfs_extlen_to_rtxmod(mp, align_alen); } /* * Result doesn't cover the request, fail it. */ if (orig_off < align_off || orig_end > align_off + align_alen) return -EINVAL; } else { ASSERT(orig_off >= align_off); /* see XFS_BMBT_MAX_EXTLEN handling above */ ASSERT(orig_end <= align_off + align_alen || align_alen + extsz > XFS_MAX_BMBT_EXTLEN); } #ifdef DEBUG if (!eof && gotp->br_startoff != NULLFILEOFF) ASSERT(align_off + align_alen <= gotp->br_startoff); if (prevp->br_startoff != NULLFILEOFF) ASSERT(align_off >= prevp->br_startoff + prevp->br_blockcount); #endif *lenp = align_alen; *offp = align_off; return 0; } #define XFS_ALLOC_GAP_UNITS 4 /* returns true if ap->blkno was modified */ bool xfs_bmap_adjacent( struct xfs_bmalloca *ap) /* bmap alloc argument struct */ { xfs_fsblock_t adjust; /* adjustment to block numbers */ xfs_mount_t *mp; /* mount point structure */ int rt; /* true if inode is realtime */ #define ISVALID(x,y) \ (rt ? \ (x) < mp->m_sb.sb_rblocks : \ XFS_FSB_TO_AGNO(mp, x) == XFS_FSB_TO_AGNO(mp, y) && \ XFS_FSB_TO_AGNO(mp, x) < mp->m_sb.sb_agcount && \ XFS_FSB_TO_AGBNO(mp, x) < mp->m_sb.sb_agblocks) mp = ap->ip->i_mount; rt = XFS_IS_REALTIME_INODE(ap->ip) && (ap->datatype & XFS_ALLOC_USERDATA); /* * If allocating at eof, and there's a previous real block, * try to use its last block as our starting point. */ if (ap->eof && ap->prev.br_startoff != NULLFILEOFF && !isnullstartblock(ap->prev.br_startblock) && ISVALID(ap->prev.br_startblock + ap->prev.br_blockcount, ap->prev.br_startblock)) { ap->blkno = ap->prev.br_startblock + ap->prev.br_blockcount; /* * Adjust for the gap between prevp and us. */ adjust = ap->offset - (ap->prev.br_startoff + ap->prev.br_blockcount); if (adjust && ISVALID(ap->blkno + adjust, ap->prev.br_startblock)) ap->blkno += adjust; return true; } /* * If not at eof, then compare the two neighbor blocks. * Figure out whether either one gives us a good starting point, * and pick the better one. */ if (!ap->eof) { xfs_fsblock_t gotbno; /* right side block number */ xfs_fsblock_t gotdiff=0; /* right side difference */ xfs_fsblock_t prevbno; /* left side block number */ xfs_fsblock_t prevdiff=0; /* left side difference */ /* * If there's a previous (left) block, select a requested * start block based on it. */ if (ap->prev.br_startoff != NULLFILEOFF && !isnullstartblock(ap->prev.br_startblock) && (prevbno = ap->prev.br_startblock + ap->prev.br_blockcount) && ISVALID(prevbno, ap->prev.br_startblock)) { /* * Calculate gap to end of previous block. */ adjust = prevdiff = ap->offset - (ap->prev.br_startoff + ap->prev.br_blockcount); /* * Figure the startblock based on the previous block's * end and the gap size. * Heuristic! * If the gap is large relative to the piece we're * allocating, or using it gives us an invalid block * number, then just use the end of the previous block. */ if (prevdiff <= XFS_ALLOC_GAP_UNITS * ap->length && ISVALID(prevbno + prevdiff, ap->prev.br_startblock)) prevbno += adjust; else prevdiff += adjust; } /* * No previous block or can't follow it, just default. */ else prevbno = NULLFSBLOCK; /* * If there's a following (right) block, select a requested * start block based on it. */ if (!isnullstartblock(ap->got.br_startblock)) { /* * Calculate gap to start of next block. */ adjust = gotdiff = ap->got.br_startoff - ap->offset; /* * Figure the startblock based on the next block's * start and the gap size. */ gotbno = ap->got.br_startblock; /* * Heuristic! * If the gap is large relative to the piece we're * allocating, or using it gives us an invalid block * number, then just use the start of the next block * offset by our length. */ if (gotdiff <= XFS_ALLOC_GAP_UNITS * ap->length && ISVALID(gotbno - gotdiff, gotbno)) gotbno -= adjust; else if (ISVALID(gotbno - ap->length, gotbno)) { gotbno -= ap->length; gotdiff += adjust - ap->length; } else gotdiff += adjust; } /* * No next block, just default. */ else gotbno = NULLFSBLOCK; /* * If both valid, pick the better one, else the only good * one, else ap->blkno is already set (to 0 or the inode block). */ if (prevbno != NULLFSBLOCK && gotbno != NULLFSBLOCK) { ap->blkno = prevdiff <= gotdiff ? prevbno : gotbno; return true; } if (prevbno != NULLFSBLOCK) { ap->blkno = prevbno; return true; } if (gotbno != NULLFSBLOCK) { ap->blkno = gotbno; return true; } } #undef ISVALID return false; } int xfs_bmap_longest_free_extent( struct xfs_perag *pag, struct xfs_trans *tp, xfs_extlen_t *blen) { xfs_extlen_t longest; int error = 0; if (!xfs_perag_initialised_agf(pag)) { error = xfs_alloc_read_agf(pag, tp, XFS_ALLOC_FLAG_TRYLOCK, NULL); if (error) return error; } longest = xfs_alloc_longest_free_extent(pag, xfs_alloc_min_freelist(pag->pag_mount, pag), xfs_ag_resv_needed(pag, XFS_AG_RESV_NONE)); if (*blen < longest) *blen = longest; return 0; } static xfs_extlen_t xfs_bmap_select_minlen( struct xfs_bmalloca *ap, struct xfs_alloc_arg *args, xfs_extlen_t blen) { /* * Since we used XFS_ALLOC_FLAG_TRYLOCK in _longest_free_extent(), it is * possible that there is enough contiguous free space for this request. */ if (blen < ap->minlen) return ap->minlen; /* * If the best seen length is less than the request length, * use the best as the minimum, otherwise we've got the maxlen we * were asked for. */ if (blen < args->maxlen) return blen; return args->maxlen; } static int xfs_bmap_btalloc_select_lengths( struct xfs_bmalloca *ap, struct xfs_alloc_arg *args, xfs_extlen_t *blen) { struct xfs_mount *mp = args->mp; struct xfs_perag *pag; xfs_agnumber_t agno, startag; int error = 0; if (ap->tp->t_flags & XFS_TRANS_LOWMODE) { args->total = ap->minlen; args->minlen = ap->minlen; return 0; } args->total = ap->total; startag = XFS_FSB_TO_AGNO(mp, ap->blkno); if (startag == NULLAGNUMBER) startag = 0; *blen = 0; for_each_perag_wrap(mp, startag, agno, pag) { error = xfs_bmap_longest_free_extent(pag, args->tp, blen); if (error && error != -EAGAIN) break; error = 0; if (*blen >= args->maxlen) break; } if (pag) xfs_perag_rele(pag); args->minlen = xfs_bmap_select_minlen(ap, args, *blen); return error; } /* Update all inode and quota accounting for the allocation we just did. */ void xfs_bmap_alloc_account( struct xfs_bmalloca *ap) { bool isrt = XFS_IS_REALTIME_INODE(ap->ip) && !(ap->flags & XFS_BMAPI_ATTRFORK); uint fld; if (ap->flags & XFS_BMAPI_COWFORK) { /* * COW fork blocks are in-core only and thus are treated as * in-core quota reservation (like delalloc blocks) even when * converted to real blocks. The quota reservation is not * accounted to disk until blocks are remapped to the data * fork. So if these blocks were previously delalloc, we * already have quota reservation and there's nothing to do * yet. */ if (ap->wasdel) { xfs_mod_delalloc(ap->ip->i_mount, -(int64_t)ap->length); return; } /* * Otherwise, we've allocated blocks in a hole. The transaction * has acquired in-core quota reservation for this extent. * Rather than account these as real blocks, however, we reduce * the transaction quota reservation based on the allocation. * This essentially transfers the transaction quota reservation * to that of a delalloc extent. */ ap->ip->i_delayed_blks += ap->length; xfs_trans_mod_dquot_byino(ap->tp, ap->ip, isrt ? XFS_TRANS_DQ_RES_RTBLKS : XFS_TRANS_DQ_RES_BLKS, -(long)ap->length); return; } /* data/attr fork only */ ap->ip->i_nblocks += ap->length; xfs_trans_log_inode(ap->tp, ap->ip, XFS_ILOG_CORE); if (ap->wasdel) { ap->ip->i_delayed_blks -= ap->length; xfs_mod_delalloc(ap->ip->i_mount, -(int64_t)ap->length); fld = isrt ? XFS_TRANS_DQ_DELRTBCOUNT : XFS_TRANS_DQ_DELBCOUNT; } else { fld = isrt ? XFS_TRANS_DQ_RTBCOUNT : XFS_TRANS_DQ_BCOUNT; } xfs_trans_mod_dquot_byino(ap->tp, ap->ip, fld, ap->length); } static int xfs_bmap_compute_alignments( struct xfs_bmalloca *ap, struct xfs_alloc_arg *args) { struct xfs_mount *mp = args->mp; xfs_extlen_t align = 0; /* minimum allocation alignment */ int stripe_align = 0; /* stripe alignment for allocation is determined by mount parameters */ if (mp->m_swidth && xfs_has_swalloc(mp)) stripe_align = mp->m_swidth; else if (mp->m_dalign) stripe_align = mp->m_dalign; if (ap->flags & XFS_BMAPI_COWFORK) align = xfs_get_cowextsz_hint(ap->ip); else if (ap->datatype & XFS_ALLOC_USERDATA) align = xfs_get_extsz_hint(ap->ip); if (align) { if (xfs_bmap_extsize_align(mp, &ap->got, &ap->prev, align, 0, ap->eof, 0, ap->conv, &ap->offset, &ap->length)) ASSERT(0); ASSERT(ap->length); } /* apply extent size hints if obtained earlier */ if (align) { args->prod = align; div_u64_rem(ap->offset, args->prod, &args->mod); if (args->mod) args->mod = args->prod - args->mod; } else if (mp->m_sb.sb_blocksize >= PAGE_SIZE) { args->prod = 1; args->mod = 0; } else { args->prod = PAGE_SIZE >> mp->m_sb.sb_blocklog; div_u64_rem(ap->offset, args->prod, &args->mod); if (args->mod) args->mod = args->prod - args->mod; } return stripe_align; } static void xfs_bmap_process_allocated_extent( struct xfs_bmalloca *ap, struct xfs_alloc_arg *args, xfs_fileoff_t orig_offset, xfs_extlen_t orig_length) { ap->blkno = args->fsbno; ap->length = args->len; /* * If the extent size hint is active, we tried to round the * caller's allocation request offset down to extsz and the * length up to another extsz boundary. If we found a free * extent we mapped it in starting at this new offset. If the * newly mapped space isn't long enough to cover any of the * range of offsets that was originally requested, move the * mapping up so that we can fill as much of the caller's * original request as possible. Free space is apparently * very fragmented so we're unlikely to be able to satisfy the * hints anyway. */ if (ap->length <= orig_length) ap->offset = orig_offset; else if (ap->offset + ap->length < orig_offset + orig_length) ap->offset = orig_offset + orig_length - ap->length; xfs_bmap_alloc_account(ap); } #ifdef DEBUG static int xfs_bmap_exact_minlen_extent_alloc( struct xfs_bmalloca *ap) { struct xfs_mount *mp = ap->ip->i_mount; struct xfs_alloc_arg args = { .tp = ap->tp, .mp = mp }; xfs_fileoff_t orig_offset; xfs_extlen_t orig_length; int error; ASSERT(ap->length); if (ap->minlen != 1) { ap->blkno = NULLFSBLOCK; ap->length = 0; return 0; } orig_offset = ap->offset; orig_length = ap->length; args.alloc_minlen_only = 1; xfs_bmap_compute_alignments(ap, &args); /* * Unlike the longest extent available in an AG, we don't track * the length of an AG's shortest extent. * XFS_ERRTAG_BMAP_ALLOC_MINLEN_EXTENT is a debug only knob and * hence we can afford to start traversing from the 0th AG since * we need not be concerned about a drop in performance in * "debug only" code paths. */ ap->blkno = XFS_AGB_TO_FSB(mp, 0, 0); args.oinfo = XFS_RMAP_OINFO_SKIP_UPDATE; args.minlen = args.maxlen = ap->minlen; args.total = ap->total; args.alignment = 1; args.minalignslop = 0; args.minleft = ap->minleft; args.wasdel = ap->wasdel; args.resv = XFS_AG_RESV_NONE; args.datatype = ap->datatype; error = xfs_alloc_vextent_first_ag(&args, ap->blkno); if (error) return error; if (args.fsbno != NULLFSBLOCK) { xfs_bmap_process_allocated_extent(ap, &args, orig_offset, orig_length); } else { ap->blkno = NULLFSBLOCK; ap->length = 0; } return 0; } #else #define xfs_bmap_exact_minlen_extent_alloc(bma) (-EFSCORRUPTED) #endif /* * If we are not low on available data blocks and we are allocating at * EOF, optimise allocation for contiguous file extension and/or stripe * alignment of the new extent. * * NOTE: ap->aeof is only set if the allocation length is >= the * stripe unit and the allocation offset is at the end of file. */ static int xfs_bmap_btalloc_at_eof( struct xfs_bmalloca *ap, struct xfs_alloc_arg *args, xfs_extlen_t blen, int stripe_align, bool ag_only) { struct xfs_mount *mp = args->mp; struct xfs_perag *caller_pag = args->pag; int error; /* * If there are already extents in the file, try an exact EOF block * allocation to extend the file as a contiguous extent. If that fails, * or it's the first allocation in a file, just try for a stripe aligned * allocation. */ if (ap->offset) { xfs_extlen_t nextminlen = 0; /* * Compute the minlen+alignment for the next case. Set slop so * that the value of minlen+alignment+slop doesn't go up between * the calls. */ args->alignment = 1; if (blen > stripe_align && blen <= args->maxlen) nextminlen = blen - stripe_align; else nextminlen = args->minlen; if (nextminlen + stripe_align > args->minlen + 1) args->minalignslop = nextminlen + stripe_align - args->minlen - 1; else args->minalignslop = 0; if (!caller_pag) args->pag = xfs_perag_get(mp, XFS_FSB_TO_AGNO(mp, ap->blkno)); error = xfs_alloc_vextent_exact_bno(args, ap->blkno); if (!caller_pag) { xfs_perag_put(args->pag); args->pag = NULL; } if (error) return error; if (args->fsbno != NULLFSBLOCK) return 0; /* * Exact allocation failed. Reset to try an aligned allocation * according to the original allocation specification. */ args->alignment = stripe_align; args->minlen = nextminlen; args->minalignslop = 0; } else { /* * Adjust minlen to try and preserve alignment if we * can't guarantee an aligned maxlen extent. */ args->alignment = stripe_align; if (blen > args->alignment && blen <= args->maxlen + args->alignment) args->minlen = blen - args->alignment; args->minalignslop = 0; } if (ag_only) { error = xfs_alloc_vextent_near_bno(args, ap->blkno); } else { args->pag = NULL; error = xfs_alloc_vextent_start_ag(args, ap->blkno); ASSERT(args->pag == NULL); args->pag = caller_pag; } if (error) return error; if (args->fsbno != NULLFSBLOCK) return 0; /* * Allocation failed, so turn return the allocation args to their * original non-aligned state so the caller can proceed on allocation * failure as if this function was never called. */ args->alignment = 1; return 0; } /* * We have failed multiple allocation attempts so now are in a low space * allocation situation. Try a locality first full filesystem minimum length * allocation whilst still maintaining necessary total block reservation * requirements. * * If that fails, we are now critically low on space, so perform a last resort * allocation attempt: no reserve, no locality, blocking, minimum length, full * filesystem free space scan. We also indicate to future allocations in this * transaction that we are critically low on space so they don't waste time on * allocation modes that are unlikely to succeed. */ int xfs_bmap_btalloc_low_space( struct xfs_bmalloca *ap, struct xfs_alloc_arg *args) { int error; if (args->minlen > ap->minlen) { args->minlen = ap->minlen; error = xfs_alloc_vextent_start_ag(args, ap->blkno); if (error || args->fsbno != NULLFSBLOCK) return error; } /* Last ditch attempt before failure is declared. */ args->total = ap->minlen; error = xfs_alloc_vextent_first_ag(args, 0); if (error) return error; ap->tp->t_flags |= XFS_TRANS_LOWMODE; return 0; } static int xfs_bmap_btalloc_filestreams( struct xfs_bmalloca *ap, struct xfs_alloc_arg *args, int stripe_align) { xfs_extlen_t blen = 0; int error = 0; error = xfs_filestream_select_ag(ap, args, &blen); if (error) return error; ASSERT(args->pag); /* * If we are in low space mode, then optimal allocation will fail so * prepare for minimal allocation and jump to the low space algorithm * immediately. */ if (ap->tp->t_flags & XFS_TRANS_LOWMODE) { args->minlen = ap->minlen; ASSERT(args->fsbno == NULLFSBLOCK); goto out_low_space; } args->minlen = xfs_bmap_select_minlen(ap, args, blen); if (ap->aeof) error = xfs_bmap_btalloc_at_eof(ap, args, blen, stripe_align, true); if (!error && args->fsbno == NULLFSBLOCK) error = xfs_alloc_vextent_near_bno(args, ap->blkno); out_low_space: /* * We are now done with the perag reference for the filestreams * association provided by xfs_filestream_select_ag(). Release it now as * we've either succeeded, had a fatal error or we are out of space and * need to do a full filesystem scan for free space which will take it's * own references. */ xfs_perag_rele(args->pag); args->pag = NULL; if (error || args->fsbno != NULLFSBLOCK) return error; return xfs_bmap_btalloc_low_space(ap, args); } static int xfs_bmap_btalloc_best_length( struct xfs_bmalloca *ap, struct xfs_alloc_arg *args, int stripe_align) { xfs_extlen_t blen = 0; int error; ap->blkno = XFS_INO_TO_FSB(args->mp, ap->ip->i_ino); xfs_bmap_adjacent(ap); /* * Search for an allocation group with a single extent large enough for * the request. If one isn't found, then adjust the minimum allocation * size to the largest space found. */ error = xfs_bmap_btalloc_select_lengths(ap, args, &blen); if (error) return error; /* * Don't attempt optimal EOF allocation if previous allocations barely * succeeded due to being near ENOSPC. It is highly unlikely we'll get * optimal or even aligned allocations in this case, so don't waste time * trying. */ if (ap->aeof && !(ap->tp->t_flags & XFS_TRANS_LOWMODE)) { error = xfs_bmap_btalloc_at_eof(ap, args, blen, stripe_align, false); if (error || args->fsbno != NULLFSBLOCK) return error; } error = xfs_alloc_vextent_start_ag(args, ap->blkno); if (error || args->fsbno != NULLFSBLOCK) return error; return xfs_bmap_btalloc_low_space(ap, args); } static int xfs_bmap_btalloc( struct xfs_bmalloca *ap) { struct xfs_mount *mp = ap->ip->i_mount; struct xfs_alloc_arg args = { .tp = ap->tp, .mp = mp, .fsbno = NULLFSBLOCK, .oinfo = XFS_RMAP_OINFO_SKIP_UPDATE, .minleft = ap->minleft, .wasdel = ap->wasdel, .resv = XFS_AG_RESV_NONE, .datatype = ap->datatype, .alignment = 1, .minalignslop = 0, }; xfs_fileoff_t orig_offset; xfs_extlen_t orig_length; int error; int stripe_align; ASSERT(ap->length); orig_offset = ap->offset; orig_length = ap->length; stripe_align = xfs_bmap_compute_alignments(ap, &args); /* Trim the allocation back to the maximum an AG can fit. */ args.maxlen = min(ap->length, mp->m_ag_max_usable); if ((ap->datatype & XFS_ALLOC_USERDATA) && xfs_inode_is_filestream(ap->ip)) error = xfs_bmap_btalloc_filestreams(ap, &args, stripe_align); else error = xfs_bmap_btalloc_best_length(ap, &args, stripe_align); if (error) return error; if (args.fsbno != NULLFSBLOCK) { xfs_bmap_process_allocated_extent(ap, &args, orig_offset, orig_length); } else { ap->blkno = NULLFSBLOCK; ap->length = 0; } return 0; } /* Trim extent to fit a logical block range. */ void xfs_trim_extent( struct xfs_bmbt_irec *irec, xfs_fileoff_t bno, xfs_filblks_t len) { xfs_fileoff_t distance; xfs_fileoff_t end = bno + len; if (irec->br_startoff + irec->br_blockcount <= bno || irec->br_startoff >= end) { irec->br_blockcount = 0; return; } if (irec->br_startoff < bno) { distance = bno - irec->br_startoff; if (isnullstartblock(irec->br_startblock)) irec->br_startblock = DELAYSTARTBLOCK; if (irec->br_startblock != DELAYSTARTBLOCK && irec->br_startblock != HOLESTARTBLOCK) irec->br_startblock += distance; irec->br_startoff += distance; irec->br_blockcount -= distance; } if (end < irec->br_startoff + irec->br_blockcount) { distance = irec->br_startoff + irec->br_blockcount - end; irec->br_blockcount -= distance; } } /* * Trim the returned map to the required bounds */ STATIC void xfs_bmapi_trim_map( struct xfs_bmbt_irec *mval, struct xfs_bmbt_irec *got, xfs_fileoff_t *bno, xfs_filblks_t len, xfs_fileoff_t obno, xfs_fileoff_t end, int n, uint32_t flags) { if ((flags & XFS_BMAPI_ENTIRE) || got->br_startoff + got->br_blockcount <= obno) { *mval = *got; if (isnullstartblock(got->br_startblock)) mval->br_startblock = DELAYSTARTBLOCK; return; } if (obno > *bno) *bno = obno; ASSERT((*bno >= obno) || (n == 0)); ASSERT(*bno < end); mval->br_startoff = *bno; if (isnullstartblock(got->br_startblock)) mval->br_startblock = DELAYSTARTBLOCK; else mval->br_startblock = got->br_startblock + (*bno - got->br_startoff); /* * Return the minimum of what we got and what we asked for for * the length. We can use the len variable here because it is * modified below and we could have been there before coming * here if the first part of the allocation didn't overlap what * was asked for. */ mval->br_blockcount = XFS_FILBLKS_MIN(end - *bno, got->br_blockcount - (*bno - got->br_startoff)); mval->br_state = got->br_state; ASSERT(mval->br_blockcount <= len); return; } /* * Update and validate the extent map to return */ STATIC void xfs_bmapi_update_map( struct xfs_bmbt_irec **map, xfs_fileoff_t *bno, xfs_filblks_t *len, xfs_fileoff_t obno, xfs_fileoff_t end, int *n, uint32_t flags) { xfs_bmbt_irec_t *mval = *map; ASSERT((flags & XFS_BMAPI_ENTIRE) || ((mval->br_startoff + mval->br_blockcount) <= end)); ASSERT((flags & XFS_BMAPI_ENTIRE) || (mval->br_blockcount <= *len) || (mval->br_startoff < obno)); *bno = mval->br_startoff + mval->br_blockcount; *len = end - *bno; if (*n > 0 && mval->br_startoff == mval[-1].br_startoff) { /* update previous map with new information */ ASSERT(mval->br_startblock == mval[-1].br_startblock); ASSERT(mval->br_blockcount > mval[-1].br_blockcount); ASSERT(mval->br_state == mval[-1].br_state); mval[-1].br_blockcount = mval->br_blockcount; mval[-1].br_state = mval->br_state; } else if (*n > 0 && mval->br_startblock != DELAYSTARTBLOCK && mval[-1].br_startblock != DELAYSTARTBLOCK && mval[-1].br_startblock != HOLESTARTBLOCK && mval->br_startblock == mval[-1].br_startblock + mval[-1].br_blockcount && mval[-1].br_state == mval->br_state) { ASSERT(mval->br_startoff == mval[-1].br_startoff + mval[-1].br_blockcount); mval[-1].br_blockcount += mval->br_blockcount; } else if (*n > 0 && mval->br_startblock == DELAYSTARTBLOCK && mval[-1].br_startblock == DELAYSTARTBLOCK && mval->br_startoff == mval[-1].br_startoff + mval[-1].br_blockcount) { mval[-1].br_blockcount += mval->br_blockcount; mval[-1].br_state = mval->br_state; } else if (!((*n == 0) && ((mval->br_startoff + mval->br_blockcount) <= obno))) { mval++; (*n)++; } *map = mval; } /* * Map file blocks to filesystem blocks without allocation. */ int xfs_bmapi_read( struct xfs_inode *ip, xfs_fileoff_t bno, xfs_filblks_t len, struct xfs_bmbt_irec *mval, int *nmap, uint32_t flags) { struct xfs_mount *mp = ip->i_mount; int whichfork = xfs_bmapi_whichfork(flags); struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork); struct xfs_bmbt_irec got; xfs_fileoff_t obno; xfs_fileoff_t end; struct xfs_iext_cursor icur; int error; bool eof = false; int n = 0; ASSERT(*nmap >= 1); ASSERT(!(flags & ~(XFS_BMAPI_ATTRFORK | XFS_BMAPI_ENTIRE))); ASSERT(xfs_isilocked(ip, XFS_ILOCK_SHARED|XFS_ILOCK_EXCL)); if (WARN_ON_ONCE(!ifp)) return -EFSCORRUPTED; if (XFS_IS_CORRUPT(mp, !xfs_ifork_has_extents(ifp)) || XFS_TEST_ERROR(false, mp, XFS_ERRTAG_BMAPIFORMAT)) return -EFSCORRUPTED; if (xfs_is_shutdown(mp)) return -EIO; XFS_STATS_INC(mp, xs_blk_mapr); error = xfs_iread_extents(NULL, ip, whichfork); if (error) return error; if (!xfs_iext_lookup_extent(ip, ifp, bno, &icur, &got)) eof = true; end = bno + len; obno = bno; while (bno < end && n < *nmap) { /* Reading past eof, act as though there's a hole up to end. */ if (eof) got.br_startoff = end; if (got.br_startoff > bno) { /* Reading in a hole. */ mval->br_startoff = bno; mval->br_startblock = HOLESTARTBLOCK; mval->br_blockcount = XFS_FILBLKS_MIN(len, got.br_startoff - bno); mval->br_state = XFS_EXT_NORM; bno += mval->br_blockcount; len -= mval->br_blockcount; mval++; n++; continue; } /* set up the extent map to return. */ xfs_bmapi_trim_map(mval, &got, &bno, len, obno, end, n, flags); xfs_bmapi_update_map(&mval, &bno, &len, obno, end, &n, flags); /* If we're done, stop now. */ if (bno >= end || n >= *nmap) break; /* Else go on to the next record. */ if (!xfs_iext_next_extent(ifp, &icur, &got)) eof = true; } *nmap = n; return 0; } /* * Add a delayed allocation extent to an inode. Blocks are reserved from the * global pool and the extent inserted into the inode in-core extent tree. * * On entry, got refers to the first extent beyond the offset of the extent to * allocate or eof is specified if no such extent exists. On return, got refers * to the extent record that was inserted to the inode fork. * * Note that the allocated extent may have been merged with contiguous extents * during insertion into the inode fork. Thus, got does not reflect the current * state of the inode fork on return. If necessary, the caller can use lastx to * look up the updated record in the inode fork. */ int xfs_bmapi_reserve_delalloc( struct xfs_inode *ip, int whichfork, xfs_fileoff_t off, xfs_filblks_t len, xfs_filblks_t prealloc, struct xfs_bmbt_irec *got, struct xfs_iext_cursor *icur, int eof) { struct xfs_mount *mp = ip->i_mount; struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork); xfs_extlen_t alen; xfs_extlen_t indlen; int error; xfs_fileoff_t aoff = off; /* * Cap the alloc length. Keep track of prealloc so we know whether to * tag the inode before we return. */ alen = XFS_FILBLKS_MIN(len + prealloc, XFS_MAX_BMBT_EXTLEN); if (!eof) alen = XFS_FILBLKS_MIN(alen, got->br_startoff - aoff); if (prealloc && alen >= len) prealloc = alen - len; /* Figure out the extent size, adjust alen */ if (whichfork == XFS_COW_FORK) { struct xfs_bmbt_irec prev; xfs_extlen_t extsz = xfs_get_cowextsz_hint(ip); if (!xfs_iext_peek_prev_extent(ifp, icur, &prev)) prev.br_startoff = NULLFILEOFF; error = xfs_bmap_extsize_align(mp, got, &prev, extsz, 0, eof, 1, 0, &aoff, &alen); ASSERT(!error); } /* * Make a transaction-less quota reservation for delayed allocation * blocks. This number gets adjusted later. We return if we haven't * allocated blocks already inside this loop. */ error = xfs_quota_reserve_blkres(ip, alen); if (error) return error; /* * Split changing sb for alen and indlen since they could be coming * from different places. */ indlen = (xfs_extlen_t)xfs_bmap_worst_indlen(ip, alen); ASSERT(indlen > 0); error = xfs_mod_fdblocks(mp, -((int64_t)alen), false); if (error) goto out_unreserve_quota; error = xfs_mod_fdblocks(mp, -((int64_t)indlen), false); if (error) goto out_unreserve_blocks; ip->i_delayed_blks += alen; xfs_mod_delalloc(ip->i_mount, alen + indlen); got->br_startoff = aoff; got->br_startblock = nullstartblock(indlen); got->br_blockcount = alen; got->br_state = XFS_EXT_NORM; xfs_bmap_add_extent_hole_delay(ip, whichfork, icur, got); /* * Tag the inode if blocks were preallocated. Note that COW fork * preallocation can occur at the start or end of the extent, even when * prealloc == 0, so we must also check the aligned offset and length. */ if (whichfork == XFS_DATA_FORK && prealloc) xfs_inode_set_eofblocks_tag(ip); if (whichfork == XFS_COW_FORK && (prealloc || aoff < off || alen > len)) xfs_inode_set_cowblocks_tag(ip); return 0; out_unreserve_blocks: xfs_mod_fdblocks(mp, alen, false); out_unreserve_quota: if (XFS_IS_QUOTA_ON(mp)) xfs_quota_unreserve_blkres(ip, alen); return error; } static int xfs_bmap_alloc_userdata( struct xfs_bmalloca *bma) { struct xfs_mount *mp = bma->ip->i_mount; int whichfork = xfs_bmapi_whichfork(bma->flags); int error; /* * Set the data type being allocated. For the data fork, the first data * in the file is treated differently to all other allocations. For the * attribute fork, we only need to ensure the allocated range is not on * the busy list. */ bma->datatype = XFS_ALLOC_NOBUSY; if (whichfork == XFS_DATA_FORK || whichfork == XFS_COW_FORK) { bma->datatype |= XFS_ALLOC_USERDATA; if (bma->offset == 0) bma->datatype |= XFS_ALLOC_INITIAL_USER_DATA; if (mp->m_dalign && bma->length >= mp->m_dalign) { error = xfs_bmap_isaeof(bma, whichfork); if (error) return error; } if (XFS_IS_REALTIME_INODE(bma->ip)) return xfs_bmap_rtalloc(bma); } if (unlikely(XFS_TEST_ERROR(false, mp, XFS_ERRTAG_BMAP_ALLOC_MINLEN_EXTENT))) return xfs_bmap_exact_minlen_extent_alloc(bma); return xfs_bmap_btalloc(bma); } static int xfs_bmapi_allocate( struct xfs_bmalloca *bma) { struct xfs_mount *mp = bma->ip->i_mount; int whichfork = xfs_bmapi_whichfork(bma->flags); struct xfs_ifork *ifp = xfs_ifork_ptr(bma->ip, whichfork); int tmp_logflags = 0; int error; ASSERT(bma->length > 0); /* * For the wasdelay case, we could also just allocate the stuff asked * for in this bmap call but that wouldn't be as good. */ if (bma->wasdel) { bma->length = (xfs_extlen_t)bma->got.br_blockcount; bma->offset = bma->got.br_startoff; if (!xfs_iext_peek_prev_extent(ifp, &bma->icur, &bma->prev)) bma->prev.br_startoff = NULLFILEOFF; } else { bma->length = XFS_FILBLKS_MIN(bma->length, XFS_MAX_BMBT_EXTLEN); if (!bma->eof) bma->length = XFS_FILBLKS_MIN(bma->length, bma->got.br_startoff - bma->offset); } if (bma->flags & XFS_BMAPI_CONTIG) bma->minlen = bma->length; else bma->minlen = 1; if (bma->flags & XFS_BMAPI_METADATA) { if (unlikely(XFS_TEST_ERROR(false, mp, XFS_ERRTAG_BMAP_ALLOC_MINLEN_EXTENT))) error = xfs_bmap_exact_minlen_extent_alloc(bma); else error = xfs_bmap_btalloc(bma); } else { error = xfs_bmap_alloc_userdata(bma); } if (error || bma->blkno == NULLFSBLOCK) return error; if (bma->flags & XFS_BMAPI_ZERO) { error = xfs_zero_extent(bma->ip, bma->blkno, bma->length); if (error) return error; } if (ifp->if_format == XFS_DINODE_FMT_BTREE && !bma->cur) bma->cur = xfs_bmbt_init_cursor(mp, bma->tp, bma->ip, whichfork); /* * Bump the number of extents we've allocated * in this call. */ bma->nallocs++; if (bma->cur) bma->cur->bc_ino.flags = bma->wasdel ? XFS_BTCUR_BMBT_WASDEL : 0; bma->got.br_startoff = bma->offset; bma->got.br_startblock = bma->blkno; bma->got.br_blockcount = bma->length; bma->got.br_state = XFS_EXT_NORM; if (bma->flags & XFS_BMAPI_PREALLOC) bma->got.br_state = XFS_EXT_UNWRITTEN; if (bma->wasdel) error = xfs_bmap_add_extent_delay_real(bma, whichfork); else error = xfs_bmap_add_extent_hole_real(bma->tp, bma->ip, whichfork, &bma->icur, &bma->cur, &bma->got, &bma->logflags, bma->flags); bma->logflags |= tmp_logflags; if (error) return error; /* * Update our extent pointer, given that xfs_bmap_add_extent_delay_real * or xfs_bmap_add_extent_hole_real might have merged it into one of * the neighbouring ones. */ xfs_iext_get_extent(ifp, &bma->icur, &bma->got); ASSERT(bma->got.br_startoff <= bma->offset); ASSERT(bma->got.br_startoff + bma->got.br_blockcount >= bma->offset + bma->length); ASSERT(bma->got.br_state == XFS_EXT_NORM || bma->got.br_state == XFS_EXT_UNWRITTEN); return 0; } STATIC int xfs_bmapi_convert_unwritten( struct xfs_bmalloca *bma, struct xfs_bmbt_irec *mval, xfs_filblks_t len, uint32_t flags) { int whichfork = xfs_bmapi_whichfork(flags); struct xfs_ifork *ifp = xfs_ifork_ptr(bma->ip, whichfork); int tmp_logflags = 0; int error; /* check if we need to do unwritten->real conversion */ if (mval->br_state == XFS_EXT_UNWRITTEN && (flags & XFS_BMAPI_PREALLOC)) return 0; /* check if we need to do real->unwritten conversion */ if (mval->br_state == XFS_EXT_NORM && (flags & (XFS_BMAPI_PREALLOC | XFS_BMAPI_CONVERT)) != (XFS_BMAPI_PREALLOC | XFS_BMAPI_CONVERT)) return 0; /* * Modify (by adding) the state flag, if writing. */ ASSERT(mval->br_blockcount <= len); if (ifp->if_format == XFS_DINODE_FMT_BTREE && !bma->cur) { bma->cur = xfs_bmbt_init_cursor(bma->ip->i_mount, bma->tp, bma->ip, whichfork); } mval->br_state = (mval->br_state == XFS_EXT_UNWRITTEN) ? XFS_EXT_NORM : XFS_EXT_UNWRITTEN; /* * Before insertion into the bmbt, zero the range being converted * if required. */ if (flags & XFS_BMAPI_ZERO) { error = xfs_zero_extent(bma->ip, mval->br_startblock, mval->br_blockcount); if (error) return error; } error = xfs_bmap_add_extent_unwritten_real(bma->tp, bma->ip, whichfork, &bma->icur, &bma->cur, mval, &tmp_logflags); /* * Log the inode core unconditionally in the unwritten extent conversion * path because the conversion might not have done so (e.g., if the * extent count hasn't changed). We need to make sure the inode is dirty * in the transaction for the sake of fsync(), even if nothing has * changed, because fsync() will not force the log for this transaction * unless it sees the inode pinned. * * Note: If we're only converting cow fork extents, there aren't * any on-disk updates to make, so we don't need to log anything. */ if (whichfork != XFS_COW_FORK) bma->logflags |= tmp_logflags | XFS_ILOG_CORE; if (error) return error; /* * Update our extent pointer, given that * xfs_bmap_add_extent_unwritten_real might have merged it into one * of the neighbouring ones. */ xfs_iext_get_extent(ifp, &bma->icur, &bma->got); /* * We may have combined previously unwritten space with written space, * so generate another request. */ if (mval->br_blockcount < len) return -EAGAIN; return 0; } xfs_extlen_t xfs_bmapi_minleft( struct xfs_trans *tp, struct xfs_inode *ip, int fork) { struct xfs_ifork *ifp = xfs_ifork_ptr(ip, fork); if (tp && tp->t_highest_agno != NULLAGNUMBER) return 0; if (ifp->if_format != XFS_DINODE_FMT_BTREE) return 1; return be16_to_cpu(ifp->if_broot->bb_level) + 1; } /* * Log whatever the flags say, even if error. Otherwise we might miss detecting * a case where the data is changed, there's an error, and it's not logged so we * don't shutdown when we should. Don't bother logging extents/btree changes if * we converted to the other format. */ static void xfs_bmapi_finish( struct xfs_bmalloca *bma, int whichfork, int error) { struct xfs_ifork *ifp = xfs_ifork_ptr(bma->ip, whichfork); if ((bma->logflags & xfs_ilog_fext(whichfork)) && ifp->if_format != XFS_DINODE_FMT_EXTENTS) bma->logflags &= ~xfs_ilog_fext(whichfork); else if ((bma->logflags & xfs_ilog_fbroot(whichfork)) && ifp->if_format != XFS_DINODE_FMT_BTREE) bma->logflags &= ~xfs_ilog_fbroot(whichfork); if (bma->logflags) xfs_trans_log_inode(bma->tp, bma->ip, bma->logflags); if (bma->cur) xfs_btree_del_cursor(bma->cur, error); } /* * Map file blocks to filesystem blocks, and allocate blocks or convert the * extent state if necessary. Details behaviour is controlled by the flags * parameter. Only allocates blocks from a single allocation group, to avoid * locking problems. */ int xfs_bmapi_write( struct xfs_trans *tp, /* transaction pointer */ struct xfs_inode *ip, /* incore inode */ xfs_fileoff_t bno, /* starting file offs. mapped */ xfs_filblks_t len, /* length to map in file */ uint32_t flags, /* XFS_BMAPI_... */ xfs_extlen_t total, /* total blocks needed */ struct xfs_bmbt_irec *mval, /* output: map values */ int *nmap) /* i/o: mval size/count */ { struct xfs_bmalloca bma = { .tp = tp, .ip = ip, .total = total, }; struct xfs_mount *mp = ip->i_mount; int whichfork = xfs_bmapi_whichfork(flags); struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork); xfs_fileoff_t end; /* end of mapped file region */ bool eof = false; /* after the end of extents */ int error; /* error return */ int n; /* current extent index */ xfs_fileoff_t obno; /* old block number (offset) */ #ifdef DEBUG xfs_fileoff_t orig_bno; /* original block number value */ int orig_flags; /* original flags arg value */ xfs_filblks_t orig_len; /* original value of len arg */ struct xfs_bmbt_irec *orig_mval; /* original value of mval */ int orig_nmap; /* original value of *nmap */ orig_bno = bno; orig_len = len; orig_flags = flags; orig_mval = mval; orig_nmap = *nmap; #endif ASSERT(*nmap >= 1); ASSERT(*nmap <= XFS_BMAP_MAX_NMAP); ASSERT(tp != NULL); ASSERT(len > 0); ASSERT(ifp->if_format != XFS_DINODE_FMT_LOCAL); ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL)); ASSERT(!(flags & XFS_BMAPI_REMAP)); /* zeroing is for currently only for data extents, not metadata */ ASSERT((flags & (XFS_BMAPI_METADATA | XFS_BMAPI_ZERO)) != (XFS_BMAPI_METADATA | XFS_BMAPI_ZERO)); /* * we can allocate unwritten extents or pre-zero allocated blocks, * but it makes no sense to do both at once. This would result in * zeroing the unwritten extent twice, but it still being an * unwritten extent.... */ ASSERT((flags & (XFS_BMAPI_PREALLOC | XFS_BMAPI_ZERO)) != (XFS_BMAPI_PREALLOC | XFS_BMAPI_ZERO)); if (XFS_IS_CORRUPT(mp, !xfs_ifork_has_extents(ifp)) || XFS_TEST_ERROR(false, mp, XFS_ERRTAG_BMAPIFORMAT)) { return -EFSCORRUPTED; } if (xfs_is_shutdown(mp)) return -EIO; XFS_STATS_INC(mp, xs_blk_mapw); error = xfs_iread_extents(tp, ip, whichfork); if (error) goto error0; if (!xfs_iext_lookup_extent(ip, ifp, bno, &bma.icur, &bma.got)) eof = true; if (!xfs_iext_peek_prev_extent(ifp, &bma.icur, &bma.prev)) bma.prev.br_startoff = NULLFILEOFF; bma.minleft = xfs_bmapi_minleft(tp, ip, whichfork); n = 0; end = bno + len; obno = bno; while (bno < end && n < *nmap) { bool need_alloc = false, wasdelay = false; /* in hole or beyond EOF? */ if (eof || bma.got.br_startoff > bno) { /* * CoW fork conversions should /never/ hit EOF or * holes. There should always be something for us * to work on. */ ASSERT(!((flags & XFS_BMAPI_CONVERT) && (flags & XFS_BMAPI_COWFORK))); need_alloc = true; } else if (isnullstartblock(bma.got.br_startblock)) { wasdelay = true; } /* * First, deal with the hole before the allocated space * that we found, if any. */ if (need_alloc || wasdelay) { bma.eof = eof; bma.conv = !!(flags & XFS_BMAPI_CONVERT); bma.wasdel = wasdelay; bma.offset = bno; bma.flags = flags; /* * There's a 32/64 bit type mismatch between the * allocation length request (which can be 64 bits in * length) and the bma length request, which is * xfs_extlen_t and therefore 32 bits. Hence we have to * check for 32-bit overflows and handle them here. */ if (len > (xfs_filblks_t)XFS_MAX_BMBT_EXTLEN) bma.length = XFS_MAX_BMBT_EXTLEN; else bma.length = len; ASSERT(len > 0); ASSERT(bma.length > 0); error = xfs_bmapi_allocate(&bma); if (error) goto error0; if (bma.blkno == NULLFSBLOCK) break; /* * If this is a CoW allocation, record the data in * the refcount btree for orphan recovery. */ if (whichfork == XFS_COW_FORK) xfs_refcount_alloc_cow_extent(tp, bma.blkno, bma.length); } /* Deal with the allocated space we found. */ xfs_bmapi_trim_map(mval, &bma.got, &bno, len, obno, end, n, flags); /* Execute unwritten extent conversion if necessary */ error = xfs_bmapi_convert_unwritten(&bma, mval, len, flags); if (error == -EAGAIN) continue; if (error) goto error0; /* update the extent map to return */ xfs_bmapi_update_map(&mval, &bno, &len, obno, end, &n, flags); /* * If we're done, stop now. Stop when we've allocated * XFS_BMAP_MAX_NMAP extents no matter what. Otherwise * the transaction may get too big. */ if (bno >= end || n >= *nmap || bma.nallocs >= *nmap) break; /* Else go on to the next record. */ bma.prev = bma.got; if (!xfs_iext_next_extent(ifp, &bma.icur, &bma.got)) eof = true; } *nmap = n; error = xfs_bmap_btree_to_extents(tp, ip, bma.cur, &bma.logflags, whichfork); if (error) goto error0; ASSERT(ifp->if_format != XFS_DINODE_FMT_BTREE || ifp->if_nextents > XFS_IFORK_MAXEXT(ip, whichfork)); xfs_bmapi_finish(&bma, whichfork, 0); xfs_bmap_validate_ret(orig_bno, orig_len, orig_flags, orig_mval, orig_nmap, *nmap); return 0; error0: xfs_bmapi_finish(&bma, whichfork, error); return error; } /* * Convert an existing delalloc extent to real blocks based on file offset. This * attempts to allocate the entire delalloc extent and may require multiple * invocations to allocate the target offset if a large enough physical extent * is not available. */ int xfs_bmapi_convert_delalloc( struct xfs_inode *ip, int whichfork, xfs_off_t offset, struct iomap *iomap, unsigned int *seq) { struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork); struct xfs_mount *mp = ip->i_mount; xfs_fileoff_t offset_fsb = XFS_B_TO_FSBT(mp, offset); struct xfs_bmalloca bma = { NULL }; uint16_t flags = 0; struct xfs_trans *tp; int error; if (whichfork == XFS_COW_FORK) flags |= IOMAP_F_SHARED; /* * Space for the extent and indirect blocks was reserved when the * delalloc extent was created so there's no need to do so here. */ error = xfs_trans_alloc(mp, &M_RES(mp)->tr_write, 0, 0, XFS_TRANS_RESERVE, &tp); if (error) return error; xfs_ilock(ip, XFS_ILOCK_EXCL); xfs_trans_ijoin(tp, ip, 0); error = xfs_iext_count_may_overflow(ip, whichfork, XFS_IEXT_ADD_NOSPLIT_CNT); if (error == -EFBIG) error = xfs_iext_count_upgrade(tp, ip, XFS_IEXT_ADD_NOSPLIT_CNT); if (error) goto out_trans_cancel; if (!xfs_iext_lookup_extent(ip, ifp, offset_fsb, &bma.icur, &bma.got) || bma.got.br_startoff > offset_fsb) { /* * No extent found in the range we are trying to convert. This * should only happen for the COW fork, where another thread * might have moved the extent to the data fork in the meantime. */ WARN_ON_ONCE(whichfork != XFS_COW_FORK); error = -EAGAIN; goto out_trans_cancel; } /* * If we find a real extent here we raced with another thread converting * the extent. Just return the real extent at this offset. */ if (!isnullstartblock(bma.got.br_startblock)) { xfs_bmbt_to_iomap(ip, iomap, &bma.got, 0, flags, xfs_iomap_inode_sequence(ip, flags)); *seq = READ_ONCE(ifp->if_seq); goto out_trans_cancel; } bma.tp = tp; bma.ip = ip; bma.wasdel = true; bma.offset = bma.got.br_startoff; bma.length = max_t(xfs_filblks_t, bma.got.br_blockcount, XFS_MAX_BMBT_EXTLEN); bma.minleft = xfs_bmapi_minleft(tp, ip, whichfork); /* * When we're converting the delalloc reservations backing dirty pages * in the page cache, we must be careful about how we create the new * extents: * * New CoW fork extents are created unwritten, turned into real extents * when we're about to write the data to disk, and mapped into the data * fork after the write finishes. End of story. * * New data fork extents must be mapped in as unwritten and converted * to real extents after the write succeeds to avoid exposing stale * disk contents if we crash. */ bma.flags = XFS_BMAPI_PREALLOC; if (whichfork == XFS_COW_FORK) bma.flags |= XFS_BMAPI_COWFORK; if (!xfs_iext_peek_prev_extent(ifp, &bma.icur, &bma.prev)) bma.prev.br_startoff = NULLFILEOFF; error = xfs_bmapi_allocate(&bma); if (error) goto out_finish; error = -ENOSPC; if (WARN_ON_ONCE(bma.blkno == NULLFSBLOCK)) goto out_finish; error = -EFSCORRUPTED; if (WARN_ON_ONCE(!xfs_valid_startblock(ip, bma.got.br_startblock))) goto out_finish; XFS_STATS_ADD(mp, xs_xstrat_bytes, XFS_FSB_TO_B(mp, bma.length)); XFS_STATS_INC(mp, xs_xstrat_quick); ASSERT(!isnullstartblock(bma.got.br_startblock)); xfs_bmbt_to_iomap(ip, iomap, &bma.got, 0, flags, xfs_iomap_inode_sequence(ip, flags)); *seq = READ_ONCE(ifp->if_seq); if (whichfork == XFS_COW_FORK) xfs_refcount_alloc_cow_extent(tp, bma.blkno, bma.length); error = xfs_bmap_btree_to_extents(tp, ip, bma.cur, &bma.logflags, whichfork); if (error) goto out_finish; xfs_bmapi_finish(&bma, whichfork, 0); error = xfs_trans_commit(tp); xfs_iunlock(ip, XFS_ILOCK_EXCL); return error; out_finish: xfs_bmapi_finish(&bma, whichfork, error); out_trans_cancel: xfs_trans_cancel(tp); xfs_iunlock(ip, XFS_ILOCK_EXCL); return error; } int xfs_bmapi_remap( struct xfs_trans *tp, struct xfs_inode *ip, xfs_fileoff_t bno, xfs_filblks_t len, xfs_fsblock_t startblock, uint32_t flags) { struct xfs_mount *mp = ip->i_mount; struct xfs_ifork *ifp; struct xfs_btree_cur *cur = NULL; struct xfs_bmbt_irec got; struct xfs_iext_cursor icur; int whichfork = xfs_bmapi_whichfork(flags); int logflags = 0, error; ifp = xfs_ifork_ptr(ip, whichfork); ASSERT(len > 0); ASSERT(len <= (xfs_filblks_t)XFS_MAX_BMBT_EXTLEN); ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL)); ASSERT(!(flags & ~(XFS_BMAPI_ATTRFORK | XFS_BMAPI_PREALLOC | XFS_BMAPI_NORMAP))); ASSERT((flags & (XFS_BMAPI_ATTRFORK | XFS_BMAPI_PREALLOC)) != (XFS_BMAPI_ATTRFORK | XFS_BMAPI_PREALLOC)); if (XFS_IS_CORRUPT(mp, !xfs_ifork_has_extents(ifp)) || XFS_TEST_ERROR(false, mp, XFS_ERRTAG_BMAPIFORMAT)) { return -EFSCORRUPTED; } if (xfs_is_shutdown(mp)) return -EIO; error = xfs_iread_extents(tp, ip, whichfork); if (error) return error; if (xfs_iext_lookup_extent(ip, ifp, bno, &icur, &got)) { /* make sure we only reflink into a hole. */ ASSERT(got.br_startoff > bno); ASSERT(got.br_startoff - bno >= len); } ip->i_nblocks += len; xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); if (ifp->if_format == XFS_DINODE_FMT_BTREE) { cur = xfs_bmbt_init_cursor(mp, tp, ip, whichfork); cur->bc_ino.flags = 0; } got.br_startoff = bno; got.br_startblock = startblock; got.br_blockcount = len; if (flags & XFS_BMAPI_PREALLOC) got.br_state = XFS_EXT_UNWRITTEN; else got.br_state = XFS_EXT_NORM; error = xfs_bmap_add_extent_hole_real(tp, ip, whichfork, &icur, &cur, &got, &logflags, flags); if (error) goto error0; error = xfs_bmap_btree_to_extents(tp, ip, cur, &logflags, whichfork); error0: if (ip->i_df.if_format != XFS_DINODE_FMT_EXTENTS) logflags &= ~XFS_ILOG_DEXT; else if (ip->i_df.if_format != XFS_DINODE_FMT_BTREE) logflags &= ~XFS_ILOG_DBROOT; if (logflags) xfs_trans_log_inode(tp, ip, logflags); if (cur) xfs_btree_del_cursor(cur, error); return error; } /* * When a delalloc extent is split (e.g., due to a hole punch), the original * indlen reservation must be shared across the two new extents that are left * behind. * * Given the original reservation and the worst case indlen for the two new * extents (as calculated by xfs_bmap_worst_indlen()), split the original * reservation fairly across the two new extents. If necessary, steal available * blocks from a deleted extent to make up a reservation deficiency (e.g., if * ores == 1). The number of stolen blocks is returned. The availability and * subsequent accounting of stolen blocks is the responsibility of the caller. */ static xfs_filblks_t xfs_bmap_split_indlen( xfs_filblks_t ores, /* original res. */ xfs_filblks_t *indlen1, /* ext1 worst indlen */ xfs_filblks_t *indlen2, /* ext2 worst indlen */ xfs_filblks_t avail) /* stealable blocks */ { xfs_filblks_t len1 = *indlen1; xfs_filblks_t len2 = *indlen2; xfs_filblks_t nres = len1 + len2; /* new total res. */ xfs_filblks_t stolen = 0; xfs_filblks_t resfactor; /* * Steal as many blocks as we can to try and satisfy the worst case * indlen for both new extents. */ if (ores < nres && avail) stolen = XFS_FILBLKS_MIN(nres - ores, avail); ores += stolen; /* nothing else to do if we've satisfied the new reservation */ if (ores >= nres) return stolen; /* * We can't meet the total required reservation for the two extents. * Calculate the percent of the overall shortage between both extents * and apply this percentage to each of the requested indlen values. * This distributes the shortage fairly and reduces the chances that one * of the two extents is left with nothing when extents are repeatedly * split. */ resfactor = (ores * 100); do_div(resfactor, nres); len1 *= resfactor; do_div(len1, 100); len2 *= resfactor; do_div(len2, 100); ASSERT(len1 + len2 <= ores); ASSERT(len1 < *indlen1 && len2 < *indlen2); /* * Hand out the remainder to each extent. If one of the two reservations * is zero, we want to make sure that one gets a block first. The loop * below starts with len1, so hand len2 a block right off the bat if it * is zero. */ ores -= (len1 + len2); ASSERT((*indlen1 - len1) + (*indlen2 - len2) >= ores); if (ores && !len2 && *indlen2) { len2++; ores--; } while (ores) { if (len1 < *indlen1) { len1++; ores--; } if (!ores) break; if (len2 < *indlen2) { len2++; ores--; } } *indlen1 = len1; *indlen2 = len2; return stolen; } int xfs_bmap_del_extent_delay( struct xfs_inode *ip, int whichfork, struct xfs_iext_cursor *icur, struct xfs_bmbt_irec *got, struct xfs_bmbt_irec *del) { struct xfs_mount *mp = ip->i_mount; struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork); struct xfs_bmbt_irec new; int64_t da_old, da_new, da_diff = 0; xfs_fileoff_t del_endoff, got_endoff; xfs_filblks_t got_indlen, new_indlen, stolen; uint32_t state = xfs_bmap_fork_to_state(whichfork); int error = 0; bool isrt; XFS_STATS_INC(mp, xs_del_exlist); isrt = (whichfork == XFS_DATA_FORK) && XFS_IS_REALTIME_INODE(ip); del_endoff = del->br_startoff + del->br_blockcount; got_endoff = got->br_startoff + got->br_blockcount; da_old = startblockval(got->br_startblock); da_new = 0; ASSERT(del->br_blockcount > 0); ASSERT(got->br_startoff <= del->br_startoff); ASSERT(got_endoff >= del_endoff); if (isrt) xfs_mod_frextents(mp, xfs_rtb_to_rtx(mp, del->br_blockcount)); /* * Update the inode delalloc counter now and wait to update the * sb counters as we might have to borrow some blocks for the * indirect block accounting. */ ASSERT(!isrt); error = xfs_quota_unreserve_blkres(ip, del->br_blockcount); if (error) return error; ip->i_delayed_blks -= del->br_blockcount; if (got->br_startoff == del->br_startoff) state |= BMAP_LEFT_FILLING; if (got_endoff == del_endoff) state |= BMAP_RIGHT_FILLING; switch (state & (BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING)) { case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING: /* * Matches the whole extent. Delete the entry. */ xfs_iext_remove(ip, icur, state); xfs_iext_prev(ifp, icur); break; case BMAP_LEFT_FILLING: /* * Deleting the first part of the extent. */ got->br_startoff = del_endoff; got->br_blockcount -= del->br_blockcount; da_new = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, got->br_blockcount), da_old); got->br_startblock = nullstartblock((int)da_new); xfs_iext_update_extent(ip, state, icur, got); break; case BMAP_RIGHT_FILLING: /* * Deleting the last part of the extent. */ got->br_blockcount = got->br_blockcount - del->br_blockcount; da_new = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, got->br_blockcount), da_old); got->br_startblock = nullstartblock((int)da_new); xfs_iext_update_extent(ip, state, icur, got); break; case 0: /* * Deleting the middle of the extent. * * Distribute the original indlen reservation across the two new * extents. Steal blocks from the deleted extent if necessary. * Stealing blocks simply fudges the fdblocks accounting below. * Warn if either of the new indlen reservations is zero as this * can lead to delalloc problems. */ got->br_blockcount = del->br_startoff - got->br_startoff; got_indlen = xfs_bmap_worst_indlen(ip, got->br_blockcount); new.br_blockcount = got_endoff - del_endoff; new_indlen = xfs_bmap_worst_indlen(ip, new.br_blockcount); WARN_ON_ONCE(!got_indlen || !new_indlen); stolen = xfs_bmap_split_indlen(da_old, &got_indlen, &new_indlen, del->br_blockcount); got->br_startblock = nullstartblock((int)got_indlen); new.br_startoff = del_endoff; new.br_state = got->br_state; new.br_startblock = nullstartblock((int)new_indlen); xfs_iext_update_extent(ip, state, icur, got); xfs_iext_next(ifp, icur); xfs_iext_insert(ip, icur, &new, state); da_new = got_indlen + new_indlen - stolen; del->br_blockcount -= stolen; break; } ASSERT(da_old >= da_new); da_diff = da_old - da_new; if (!isrt) da_diff += del->br_blockcount; if (da_diff) { xfs_mod_fdblocks(mp, da_diff, false); xfs_mod_delalloc(mp, -da_diff); } return error; } void xfs_bmap_del_extent_cow( struct xfs_inode *ip, struct xfs_iext_cursor *icur, struct xfs_bmbt_irec *got, struct xfs_bmbt_irec *del) { struct xfs_mount *mp = ip->i_mount; struct xfs_ifork *ifp = xfs_ifork_ptr(ip, XFS_COW_FORK); struct xfs_bmbt_irec new; xfs_fileoff_t del_endoff, got_endoff; uint32_t state = BMAP_COWFORK; XFS_STATS_INC(mp, xs_del_exlist); del_endoff = del->br_startoff + del->br_blockcount; got_endoff = got->br_startoff + got->br_blockcount; ASSERT(del->br_blockcount > 0); ASSERT(got->br_startoff <= del->br_startoff); ASSERT(got_endoff >= del_endoff); ASSERT(!isnullstartblock(got->br_startblock)); if (got->br_startoff == del->br_startoff) state |= BMAP_LEFT_FILLING; if (got_endoff == del_endoff) state |= BMAP_RIGHT_FILLING; switch (state & (BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING)) { case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING: /* * Matches the whole extent. Delete the entry. */ xfs_iext_remove(ip, icur, state); xfs_iext_prev(ifp, icur); break; case BMAP_LEFT_FILLING: /* * Deleting the first part of the extent. */ got->br_startoff = del_endoff; got->br_blockcount -= del->br_blockcount; got->br_startblock = del->br_startblock + del->br_blockcount; xfs_iext_update_extent(ip, state, icur, got); break; case BMAP_RIGHT_FILLING: /* * Deleting the last part of the extent. */ got->br_blockcount -= del->br_blockcount; xfs_iext_update_extent(ip, state, icur, got); break; case 0: /* * Deleting the middle of the extent. */ got->br_blockcount = del->br_startoff - got->br_startoff; new.br_startoff = del_endoff; new.br_blockcount = got_endoff - del_endoff; new.br_state = got->br_state; new.br_startblock = del->br_startblock + del->br_blockcount; xfs_iext_update_extent(ip, state, icur, got); xfs_iext_next(ifp, icur); xfs_iext_insert(ip, icur, &new, state); break; } ip->i_delayed_blks -= del->br_blockcount; } /* * Called by xfs_bmapi to update file extent records and the btree * after removing space. */ STATIC int /* error */ xfs_bmap_del_extent_real( xfs_inode_t *ip, /* incore inode pointer */ xfs_trans_t *tp, /* current transaction pointer */ struct xfs_iext_cursor *icur, struct xfs_btree_cur *cur, /* if null, not a btree */ xfs_bmbt_irec_t *del, /* data to remove from extents */ int *logflagsp, /* inode logging flags */ int whichfork, /* data or attr fork */ uint32_t bflags) /* bmapi flags */ { xfs_fsblock_t del_endblock=0; /* first block past del */ xfs_fileoff_t del_endoff; /* first offset past del */ int do_fx; /* free extent at end of routine */ int error; /* error return value */ struct xfs_bmbt_irec got; /* current extent entry */ xfs_fileoff_t got_endoff; /* first offset past got */ int i; /* temp state */ struct xfs_ifork *ifp; /* inode fork pointer */ xfs_mount_t *mp; /* mount structure */ xfs_filblks_t nblks; /* quota/sb block count */ xfs_bmbt_irec_t new; /* new record to be inserted */ /* REFERENCED */ uint qfield; /* quota field to update */ uint32_t state = xfs_bmap_fork_to_state(whichfork); struct xfs_bmbt_irec old; *logflagsp = 0; mp = ip->i_mount; XFS_STATS_INC(mp, xs_del_exlist); ifp = xfs_ifork_ptr(ip, whichfork); ASSERT(del->br_blockcount > 0); xfs_iext_get_extent(ifp, icur, &got); ASSERT(got.br_startoff <= del->br_startoff); del_endoff = del->br_startoff + del->br_blockcount; got_endoff = got.br_startoff + got.br_blockcount; ASSERT(got_endoff >= del_endoff); ASSERT(!isnullstartblock(got.br_startblock)); qfield = 0; /* * If it's the case where the directory code is running with no block * reservation, and the deleted block is in the middle of its extent, * and the resulting insert of an extent would cause transformation to * btree format, then reject it. The calling code will then swap blocks * around instead. We have to do this now, rather than waiting for the * conversion to btree format, since the transaction will be dirty then. */ if (tp->t_blk_res == 0 && ifp->if_format == XFS_DINODE_FMT_EXTENTS && ifp->if_nextents >= XFS_IFORK_MAXEXT(ip, whichfork) && del->br_startoff > got.br_startoff && del_endoff < got_endoff) return -ENOSPC; *logflagsp = XFS_ILOG_CORE; if (whichfork == XFS_DATA_FORK && XFS_IS_REALTIME_INODE(ip)) { if (!(bflags & XFS_BMAPI_REMAP)) { error = xfs_rtfree_blocks(tp, del->br_startblock, del->br_blockcount); if (error) return error; } do_fx = 0; qfield = XFS_TRANS_DQ_RTBCOUNT; } else { do_fx = 1; qfield = XFS_TRANS_DQ_BCOUNT; } nblks = del->br_blockcount; del_endblock = del->br_startblock + del->br_blockcount; if (cur) { error = xfs_bmbt_lookup_eq(cur, &got, &i); if (error) return error; if (XFS_IS_CORRUPT(mp, i != 1)) return -EFSCORRUPTED; } if (got.br_startoff == del->br_startoff) state |= BMAP_LEFT_FILLING; if (got_endoff == del_endoff) state |= BMAP_RIGHT_FILLING; switch (state & (BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING)) { case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING: /* * Matches the whole extent. Delete the entry. */ xfs_iext_remove(ip, icur, state); xfs_iext_prev(ifp, icur); ifp->if_nextents--; *logflagsp |= XFS_ILOG_CORE; if (!cur) { *logflagsp |= xfs_ilog_fext(whichfork); break; } if ((error = xfs_btree_delete(cur, &i))) return error; if (XFS_IS_CORRUPT(mp, i != 1)) return -EFSCORRUPTED; break; case BMAP_LEFT_FILLING: /* * Deleting the first part of the extent. */ got.br_startoff = del_endoff; got.br_startblock = del_endblock; got.br_blockcount -= del->br_blockcount; xfs_iext_update_extent(ip, state, icur, &got); if (!cur) { *logflagsp |= xfs_ilog_fext(whichfork); break; } error = xfs_bmbt_update(cur, &got); if (error) return error; break; case BMAP_RIGHT_FILLING: /* * Deleting the last part of the extent. */ got.br_blockcount -= del->br_blockcount; xfs_iext_update_extent(ip, state, icur, &got); if (!cur) { *logflagsp |= xfs_ilog_fext(whichfork); break; } error = xfs_bmbt_update(cur, &got); if (error) return error; break; case 0: /* * Deleting the middle of the extent. */ old = got; got.br_blockcount = del->br_startoff - got.br_startoff; xfs_iext_update_extent(ip, state, icur, &got); new.br_startoff = del_endoff; new.br_blockcount = got_endoff - del_endoff; new.br_state = got.br_state; new.br_startblock = del_endblock; *logflagsp |= XFS_ILOG_CORE; if (cur) { error = xfs_bmbt_update(cur, &got); if (error) return error; error = xfs_btree_increment(cur, 0, &i); if (error) return error; cur->bc_rec.b = new; error = xfs_btree_insert(cur, &i); if (error && error != -ENOSPC) return error; /* * If get no-space back from btree insert, it tried a * split, and we have a zero block reservation. Fix up * our state and return the error. */ if (error == -ENOSPC) { /* * Reset the cursor, don't trust it after any * insert operation. */ error = xfs_bmbt_lookup_eq(cur, &got, &i); if (error) return error; if (XFS_IS_CORRUPT(mp, i != 1)) return -EFSCORRUPTED; /* * Update the btree record back * to the original value. */ error = xfs_bmbt_update(cur, &old); if (error) return error; /* * Reset the extent record back * to the original value. */ xfs_iext_update_extent(ip, state, icur, &old); *logflagsp = 0; return -ENOSPC; } if (XFS_IS_CORRUPT(mp, i != 1)) return -EFSCORRUPTED; } else *logflagsp |= xfs_ilog_fext(whichfork); ifp->if_nextents++; xfs_iext_next(ifp, icur); xfs_iext_insert(ip, icur, &new, state); break; } /* remove reverse mapping */ xfs_rmap_unmap_extent(tp, ip, whichfork, del); /* * If we need to, add to list of extents to delete. */ if (do_fx && !(bflags & XFS_BMAPI_REMAP)) { if (xfs_is_reflink_inode(ip) && whichfork == XFS_DATA_FORK) { xfs_refcount_decrease_extent(tp, del); } else { error = xfs_free_extent_later(tp, del->br_startblock, del->br_blockcount, NULL, XFS_AG_RESV_NONE, ((bflags & XFS_BMAPI_NODISCARD) || del->br_state == XFS_EXT_UNWRITTEN)); if (error) return error; } } /* * Adjust inode # blocks in the file. */ if (nblks) ip->i_nblocks -= nblks; /* * Adjust quota data. */ if (qfield && !(bflags & XFS_BMAPI_REMAP)) xfs_trans_mod_dquot_byino(tp, ip, qfield, (long)-nblks); return 0; } /* * Unmap (remove) blocks from a file. * If nexts is nonzero then the number of extents to remove is limited to * that value. If not all extents in the block range can be removed then * *done is set. */ static int __xfs_bunmapi( struct xfs_trans *tp, /* transaction pointer */ struct xfs_inode *ip, /* incore inode */ xfs_fileoff_t start, /* first file offset deleted */ xfs_filblks_t *rlen, /* i/o: amount remaining */ uint32_t flags, /* misc flags */ xfs_extnum_t nexts) /* number of extents max */ { struct xfs_btree_cur *cur; /* bmap btree cursor */ struct xfs_bmbt_irec del; /* extent being deleted */ int error; /* error return value */ xfs_extnum_t extno; /* extent number in list */ struct xfs_bmbt_irec got; /* current extent record */ struct xfs_ifork *ifp; /* inode fork pointer */ int isrt; /* freeing in rt area */ int logflags; /* transaction logging flags */ xfs_extlen_t mod; /* rt extent offset */ struct xfs_mount *mp = ip->i_mount; int tmp_logflags; /* partial logging flags */ int wasdel; /* was a delayed alloc extent */ int whichfork; /* data or attribute fork */ xfs_filblks_t len = *rlen; /* length to unmap in file */ xfs_fileoff_t end; struct xfs_iext_cursor icur; bool done = false; trace_xfs_bunmap(ip, start, len, flags, _RET_IP_); whichfork = xfs_bmapi_whichfork(flags); ASSERT(whichfork != XFS_COW_FORK); ifp = xfs_ifork_ptr(ip, whichfork); if (XFS_IS_CORRUPT(mp, !xfs_ifork_has_extents(ifp))) return -EFSCORRUPTED; if (xfs_is_shutdown(mp)) return -EIO; ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL)); ASSERT(len > 0); ASSERT(nexts >= 0); error = xfs_iread_extents(tp, ip, whichfork); if (error) return error; if (xfs_iext_count(ifp) == 0) { *rlen = 0; return 0; } XFS_STATS_INC(mp, xs_blk_unmap); isrt = (whichfork == XFS_DATA_FORK) && XFS_IS_REALTIME_INODE(ip); end = start + len; if (!xfs_iext_lookup_extent_before(ip, ifp, &end, &icur, &got)) { *rlen = 0; return 0; } end--; logflags = 0; if (ifp->if_format == XFS_DINODE_FMT_BTREE) { ASSERT(ifp->if_format == XFS_DINODE_FMT_BTREE); cur = xfs_bmbt_init_cursor(mp, tp, ip, whichfork); cur->bc_ino.flags = 0; } else cur = NULL; if (isrt) { /* * Synchronize by locking the bitmap inode. */ xfs_ilock(mp->m_rbmip, XFS_ILOCK_EXCL|XFS_ILOCK_RTBITMAP); xfs_trans_ijoin(tp, mp->m_rbmip, XFS_ILOCK_EXCL); xfs_ilock(mp->m_rsumip, XFS_ILOCK_EXCL|XFS_ILOCK_RTSUM); xfs_trans_ijoin(tp, mp->m_rsumip, XFS_ILOCK_EXCL); } extno = 0; while (end != (xfs_fileoff_t)-1 && end >= start && (nexts == 0 || extno < nexts)) { /* * Is the found extent after a hole in which end lives? * Just back up to the previous extent, if so. */ if (got.br_startoff > end && !xfs_iext_prev_extent(ifp, &icur, &got)) { done = true; break; } /* * Is the last block of this extent before the range * we're supposed to delete? If so, we're done. */ end = XFS_FILEOFF_MIN(end, got.br_startoff + got.br_blockcount - 1); if (end < start) break; /* * Then deal with the (possibly delayed) allocated space * we found. */ del = got; wasdel = isnullstartblock(del.br_startblock); if (got.br_startoff < start) { del.br_startoff = start; del.br_blockcount -= start - got.br_startoff; if (!wasdel) del.br_startblock += start - got.br_startoff; } if (del.br_startoff + del.br_blockcount > end + 1) del.br_blockcount = end + 1 - del.br_startoff; if (!isrt) goto delete; mod = xfs_rtb_to_rtxoff(mp, del.br_startblock + del.br_blockcount); if (mod) { /* * Realtime extent not lined up at the end. * The extent could have been split into written * and unwritten pieces, or we could just be * unmapping part of it. But we can't really * get rid of part of a realtime extent. */ if (del.br_state == XFS_EXT_UNWRITTEN) { /* * This piece is unwritten, or we're not * using unwritten extents. Skip over it. */ ASSERT(end >= mod); end -= mod > del.br_blockcount ? del.br_blockcount : mod; if (end < got.br_startoff && !xfs_iext_prev_extent(ifp, &icur, &got)) { done = true; break; } continue; } /* * It's written, turn it unwritten. * This is better than zeroing it. */ ASSERT(del.br_state == XFS_EXT_NORM); ASSERT(tp->t_blk_res > 0); /* * If this spans a realtime extent boundary, * chop it back to the start of the one we end at. */ if (del.br_blockcount > mod) { del.br_startoff += del.br_blockcount - mod; del.br_startblock += del.br_blockcount - mod; del.br_blockcount = mod; } del.br_state = XFS_EXT_UNWRITTEN; error = xfs_bmap_add_extent_unwritten_real(tp, ip, whichfork, &icur, &cur, &del, &logflags); if (error) goto error0; goto nodelete; } mod = xfs_rtb_to_rtxoff(mp, del.br_startblock); if (mod) { xfs_extlen_t off = mp->m_sb.sb_rextsize - mod; /* * Realtime extent is lined up at the end but not * at the front. We'll get rid of full extents if * we can. */ if (del.br_blockcount > off) { del.br_blockcount -= off; del.br_startoff += off; del.br_startblock += off; } else if (del.br_startoff == start && (del.br_state == XFS_EXT_UNWRITTEN || tp->t_blk_res == 0)) { /* * Can't make it unwritten. There isn't * a full extent here so just skip it. */ ASSERT(end >= del.br_blockcount); end -= del.br_blockcount; if (got.br_startoff > end && !xfs_iext_prev_extent(ifp, &icur, &got)) { done = true; break; } continue; } else if (del.br_state == XFS_EXT_UNWRITTEN) { struct xfs_bmbt_irec prev; xfs_fileoff_t unwrite_start; /* * This one is already unwritten. * It must have a written left neighbor. * Unwrite the killed part of that one and * try again. */ if (!xfs_iext_prev_extent(ifp, &icur, &prev)) ASSERT(0); ASSERT(prev.br_state == XFS_EXT_NORM); ASSERT(!isnullstartblock(prev.br_startblock)); ASSERT(del.br_startblock == prev.br_startblock + prev.br_blockcount); unwrite_start = max3(start, del.br_startoff - mod, prev.br_startoff); mod = unwrite_start - prev.br_startoff; prev.br_startoff = unwrite_start; prev.br_startblock += mod; prev.br_blockcount -= mod; prev.br_state = XFS_EXT_UNWRITTEN; error = xfs_bmap_add_extent_unwritten_real(tp, ip, whichfork, &icur, &cur, &prev, &logflags); if (error) goto error0; goto nodelete; } else { ASSERT(del.br_state == XFS_EXT_NORM); del.br_state = XFS_EXT_UNWRITTEN; error = xfs_bmap_add_extent_unwritten_real(tp, ip, whichfork, &icur, &cur, &del, &logflags); if (error) goto error0; goto nodelete; } } delete: if (wasdel) { error = xfs_bmap_del_extent_delay(ip, whichfork, &icur, &got, &del); } else { error = xfs_bmap_del_extent_real(ip, tp, &icur, cur, &del, &tmp_logflags, whichfork, flags); logflags |= tmp_logflags; } if (error) goto error0; end = del.br_startoff - 1; nodelete: /* * If not done go on to the next (previous) record. */ if (end != (xfs_fileoff_t)-1 && end >= start) { if (!xfs_iext_get_extent(ifp, &icur, &got) || (got.br_startoff > end && !xfs_iext_prev_extent(ifp, &icur, &got))) { done = true; break; } extno++; } } if (done || end == (xfs_fileoff_t)-1 || end < start) *rlen = 0; else *rlen = end - start + 1; /* * Convert to a btree if necessary. */ if (xfs_bmap_needs_btree(ip, whichfork)) { ASSERT(cur == NULL); error = xfs_bmap_extents_to_btree(tp, ip, &cur, 0, &tmp_logflags, whichfork); logflags |= tmp_logflags; } else { error = xfs_bmap_btree_to_extents(tp, ip, cur, &logflags, whichfork); } error0: /* * Log everything. Do this after conversion, there's no point in * logging the extent records if we've converted to btree format. */ if ((logflags & xfs_ilog_fext(whichfork)) && ifp->if_format != XFS_DINODE_FMT_EXTENTS) logflags &= ~xfs_ilog_fext(whichfork); else if ((logflags & xfs_ilog_fbroot(whichfork)) && ifp->if_format != XFS_DINODE_FMT_BTREE) logflags &= ~xfs_ilog_fbroot(whichfork); /* * Log inode even in the error case, if the transaction * is dirty we'll need to shut down the filesystem. */ if (logflags) xfs_trans_log_inode(tp, ip, logflags); if (cur) { if (!error) cur->bc_ino.allocated = 0; xfs_btree_del_cursor(cur, error); } return error; } /* Unmap a range of a file. */ int xfs_bunmapi( xfs_trans_t *tp, struct xfs_inode *ip, xfs_fileoff_t bno, xfs_filblks_t len, uint32_t flags, xfs_extnum_t nexts, int *done) { int error; error = __xfs_bunmapi(tp, ip, bno, &len, flags, nexts); *done = (len == 0); return error; } /* * Determine whether an extent shift can be accomplished by a merge with the * extent that precedes the target hole of the shift. */ STATIC bool xfs_bmse_can_merge( struct xfs_bmbt_irec *left, /* preceding extent */ struct xfs_bmbt_irec *got, /* current extent to shift */ xfs_fileoff_t shift) /* shift fsb */ { xfs_fileoff_t startoff; startoff = got->br_startoff - shift; /* * The extent, once shifted, must be adjacent in-file and on-disk with * the preceding extent. */ if ((left->br_startoff + left->br_blockcount != startoff) || (left->br_startblock + left->br_blockcount != got->br_startblock) || (left->br_state != got->br_state) || (left->br_blockcount + got->br_blockcount > XFS_MAX_BMBT_EXTLEN)) return false; return true; } /* * A bmap extent shift adjusts the file offset of an extent to fill a preceding * hole in the file. If an extent shift would result in the extent being fully * adjacent to the extent that currently precedes the hole, we can merge with * the preceding extent rather than do the shift. * * This function assumes the caller has verified a shift-by-merge is possible * with the provided extents via xfs_bmse_can_merge(). */ STATIC int xfs_bmse_merge( struct xfs_trans *tp, struct xfs_inode *ip, int whichfork, xfs_fileoff_t shift, /* shift fsb */ struct xfs_iext_cursor *icur, struct xfs_bmbt_irec *got, /* extent to shift */ struct xfs_bmbt_irec *left, /* preceding extent */ struct xfs_btree_cur *cur, int *logflags) /* output */ { struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork); struct xfs_bmbt_irec new; xfs_filblks_t blockcount; int error, i; struct xfs_mount *mp = ip->i_mount; blockcount = left->br_blockcount + got->br_blockcount; ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL)); ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL)); ASSERT(xfs_bmse_can_merge(left, got, shift)); new = *left; new.br_blockcount = blockcount; /* * Update the on-disk extent count, the btree if necessary and log the * inode. */ ifp->if_nextents--; *logflags |= XFS_ILOG_CORE; if (!cur) { *logflags |= XFS_ILOG_DEXT; goto done; } /* lookup and remove the extent to merge */ error = xfs_bmbt_lookup_eq(cur, got, &i); if (error) return error; if (XFS_IS_CORRUPT(mp, i != 1)) return -EFSCORRUPTED; error = xfs_btree_delete(cur, &i); if (error) return error; if (XFS_IS_CORRUPT(mp, i != 1)) return -EFSCORRUPTED; /* lookup and update size of the previous extent */ error = xfs_bmbt_lookup_eq(cur, left, &i); if (error) return error; if (XFS_IS_CORRUPT(mp, i != 1)) return -EFSCORRUPTED; error = xfs_bmbt_update(cur, &new); if (error) return error; /* change to extent format if required after extent removal */ error = xfs_bmap_btree_to_extents(tp, ip, cur, logflags, whichfork); if (error) return error; done: xfs_iext_remove(ip, icur, 0); xfs_iext_prev(ifp, icur); xfs_iext_update_extent(ip, xfs_bmap_fork_to_state(whichfork), icur, &new); /* update reverse mapping. rmap functions merge the rmaps for us */ xfs_rmap_unmap_extent(tp, ip, whichfork, got); memcpy(&new, got, sizeof(new)); new.br_startoff = left->br_startoff + left->br_blockcount; xfs_rmap_map_extent(tp, ip, whichfork, &new); return 0; } static int xfs_bmap_shift_update_extent( struct xfs_trans *tp, struct xfs_inode *ip, int whichfork, struct xfs_iext_cursor *icur, struct xfs_bmbt_irec *got, struct xfs_btree_cur *cur, int *logflags, xfs_fileoff_t startoff) { struct xfs_mount *mp = ip->i_mount; struct xfs_bmbt_irec prev = *got; int error, i; *logflags |= XFS_ILOG_CORE; got->br_startoff = startoff; if (cur) { error = xfs_bmbt_lookup_eq(cur, &prev, &i); if (error) return error; if (XFS_IS_CORRUPT(mp, i != 1)) return -EFSCORRUPTED; error = xfs_bmbt_update(cur, got); if (error) return error; } else { *logflags |= XFS_ILOG_DEXT; } xfs_iext_update_extent(ip, xfs_bmap_fork_to_state(whichfork), icur, got); /* update reverse mapping */ xfs_rmap_unmap_extent(tp, ip, whichfork, &prev); xfs_rmap_map_extent(tp, ip, whichfork, got); return 0; } int xfs_bmap_collapse_extents( struct xfs_trans *tp, struct xfs_inode *ip, xfs_fileoff_t *next_fsb, xfs_fileoff_t offset_shift_fsb, bool *done) { int whichfork = XFS_DATA_FORK; struct xfs_mount *mp = ip->i_mount; struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork); struct xfs_btree_cur *cur = NULL; struct xfs_bmbt_irec got, prev; struct xfs_iext_cursor icur; xfs_fileoff_t new_startoff; int error = 0; int logflags = 0; if (XFS_IS_CORRUPT(mp, !xfs_ifork_has_extents(ifp)) || XFS_TEST_ERROR(false, mp, XFS_ERRTAG_BMAPIFORMAT)) { return -EFSCORRUPTED; } if (xfs_is_shutdown(mp)) return -EIO; ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL)); error = xfs_iread_extents(tp, ip, whichfork); if (error) return error; if (ifp->if_format == XFS_DINODE_FMT_BTREE) { cur = xfs_bmbt_init_cursor(mp, tp, ip, whichfork); cur->bc_ino.flags = 0; } if (!xfs_iext_lookup_extent(ip, ifp, *next_fsb, &icur, &got)) { *done = true; goto del_cursor; } if (XFS_IS_CORRUPT(mp, isnullstartblock(got.br_startblock))) { error = -EFSCORRUPTED; goto del_cursor; } new_startoff = got.br_startoff - offset_shift_fsb; if (xfs_iext_peek_prev_extent(ifp, &icur, &prev)) { if (new_startoff < prev.br_startoff + prev.br_blockcount) { error = -EINVAL; goto del_cursor; } if (xfs_bmse_can_merge(&prev, &got, offset_shift_fsb)) { error = xfs_bmse_merge(tp, ip, whichfork, offset_shift_fsb, &icur, &got, &prev, cur, &logflags); if (error) goto del_cursor; goto done; } } else { if (got.br_startoff < offset_shift_fsb) { error = -EINVAL; goto del_cursor; } } error = xfs_bmap_shift_update_extent(tp, ip, whichfork, &icur, &got, cur, &logflags, new_startoff); if (error) goto del_cursor; done: if (!xfs_iext_next_extent(ifp, &icur, &got)) { *done = true; goto del_cursor; } *next_fsb = got.br_startoff; del_cursor: if (cur) xfs_btree_del_cursor(cur, error); if (logflags) xfs_trans_log_inode(tp, ip, logflags); return error; } /* Make sure we won't be right-shifting an extent past the maximum bound. */ int xfs_bmap_can_insert_extents( struct xfs_inode *ip, xfs_fileoff_t off, xfs_fileoff_t shift) { struct xfs_bmbt_irec got; int is_empty; int error = 0; ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL)); if (xfs_is_shutdown(ip->i_mount)) return -EIO; xfs_ilock(ip, XFS_ILOCK_EXCL); error = xfs_bmap_last_extent(NULL, ip, XFS_DATA_FORK, &got, &is_empty); if (!error && !is_empty && got.br_startoff >= off && ((got.br_startoff + shift) & BMBT_STARTOFF_MASK) < got.br_startoff) error = -EINVAL; xfs_iunlock(ip, XFS_ILOCK_EXCL); return error; } int xfs_bmap_insert_extents( struct xfs_trans *tp, struct xfs_inode *ip, xfs_fileoff_t *next_fsb, xfs_fileoff_t offset_shift_fsb, bool *done, xfs_fileoff_t stop_fsb) { int whichfork = XFS_DATA_FORK; struct xfs_mount *mp = ip->i_mount; struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork); struct xfs_btree_cur *cur = NULL; struct xfs_bmbt_irec got, next; struct xfs_iext_cursor icur; xfs_fileoff_t new_startoff; int error = 0; int logflags = 0; if (XFS_IS_CORRUPT(mp, !xfs_ifork_has_extents(ifp)) || XFS_TEST_ERROR(false, mp, XFS_ERRTAG_BMAPIFORMAT)) { return -EFSCORRUPTED; } if (xfs_is_shutdown(mp)) return -EIO; ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL)); error = xfs_iread_extents(tp, ip, whichfork); if (error) return error; if (ifp->if_format == XFS_DINODE_FMT_BTREE) { cur = xfs_bmbt_init_cursor(mp, tp, ip, whichfork); cur->bc_ino.flags = 0; } if (*next_fsb == NULLFSBLOCK) { xfs_iext_last(ifp, &icur); if (!xfs_iext_get_extent(ifp, &icur, &got) || stop_fsb > got.br_startoff) { *done = true; goto del_cursor; } } else { if (!xfs_iext_lookup_extent(ip, ifp, *next_fsb, &icur, &got)) { *done = true; goto del_cursor; } } if (XFS_IS_CORRUPT(mp, isnullstartblock(got.br_startblock))) { error = -EFSCORRUPTED; goto del_cursor; } if (XFS_IS_CORRUPT(mp, stop_fsb > got.br_startoff)) { error = -EFSCORRUPTED; goto del_cursor; } new_startoff = got.br_startoff + offset_shift_fsb; if (xfs_iext_peek_next_extent(ifp, &icur, &next)) { if (new_startoff + got.br_blockcount > next.br_startoff) { error = -EINVAL; goto del_cursor; } /* * Unlike a left shift (which involves a hole punch), a right * shift does not modify extent neighbors in any way. We should * never find mergeable extents in this scenario. Check anyways * and warn if we encounter two extents that could be one. */ if (xfs_bmse_can_merge(&got, &next, offset_shift_fsb)) WARN_ON_ONCE(1); } error = xfs_bmap_shift_update_extent(tp, ip, whichfork, &icur, &got, cur, &logflags, new_startoff); if (error) goto del_cursor; if (!xfs_iext_prev_extent(ifp, &icur, &got) || stop_fsb >= got.br_startoff + got.br_blockcount) { *done = true; goto del_cursor; } *next_fsb = got.br_startoff; del_cursor: if (cur) xfs_btree_del_cursor(cur, error); if (logflags) xfs_trans_log_inode(tp, ip, logflags); return error; } /* * Splits an extent into two extents at split_fsb block such that it is the * first block of the current_ext. @ext is a target extent to be split. * @split_fsb is a block where the extents is split. If split_fsb lies in a * hole or the first block of extents, just return 0. */ int xfs_bmap_split_extent( struct xfs_trans *tp, struct xfs_inode *ip, xfs_fileoff_t split_fsb) { int whichfork = XFS_DATA_FORK; struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork); struct xfs_btree_cur *cur = NULL; struct xfs_bmbt_irec got; struct xfs_bmbt_irec new; /* split extent */ struct xfs_mount *mp = ip->i_mount; xfs_fsblock_t gotblkcnt; /* new block count for got */ struct xfs_iext_cursor icur; int error = 0; int logflags = 0; int i = 0; if (XFS_IS_CORRUPT(mp, !xfs_ifork_has_extents(ifp)) || XFS_TEST_ERROR(false, mp, XFS_ERRTAG_BMAPIFORMAT)) { return -EFSCORRUPTED; } if (xfs_is_shutdown(mp)) return -EIO; /* Read in all the extents */ error = xfs_iread_extents(tp, ip, whichfork); if (error) return error; /* * If there are not extents, or split_fsb lies in a hole we are done. */ if (!xfs_iext_lookup_extent(ip, ifp, split_fsb, &icur, &got) || got.br_startoff >= split_fsb) return 0; gotblkcnt = split_fsb - got.br_startoff; new.br_startoff = split_fsb; new.br_startblock = got.br_startblock + gotblkcnt; new.br_blockcount = got.br_blockcount - gotblkcnt; new.br_state = got.br_state; if (ifp->if_format == XFS_DINODE_FMT_BTREE) { cur = xfs_bmbt_init_cursor(mp, tp, ip, whichfork); cur->bc_ino.flags = 0; error = xfs_bmbt_lookup_eq(cur, &got, &i); if (error) goto del_cursor; if (XFS_IS_CORRUPT(mp, i != 1)) { error = -EFSCORRUPTED; goto del_cursor; } } got.br_blockcount = gotblkcnt; xfs_iext_update_extent(ip, xfs_bmap_fork_to_state(whichfork), &icur, &got); logflags = XFS_ILOG_CORE; if (cur) { error = xfs_bmbt_update(cur, &got); if (error) goto del_cursor; } else logflags |= XFS_ILOG_DEXT; /* Add new extent */ xfs_iext_next(ifp, &icur); xfs_iext_insert(ip, &icur, &new, 0); ifp->if_nextents++; if (cur) { error = xfs_bmbt_lookup_eq(cur, &new, &i); if (error) goto del_cursor; if (XFS_IS_CORRUPT(mp, i != 0)) { error = -EFSCORRUPTED; goto del_cursor; } error = xfs_btree_insert(cur, &i); if (error) goto del_cursor; if (XFS_IS_CORRUPT(mp, i != 1)) { error = -EFSCORRUPTED; goto del_cursor; } } /* * Convert to a btree if necessary. */ if (xfs_bmap_needs_btree(ip, whichfork)) { int tmp_logflags; /* partial log flag return val */ ASSERT(cur == NULL); error = xfs_bmap_extents_to_btree(tp, ip, &cur, 0, &tmp_logflags, whichfork); logflags |= tmp_logflags; } del_cursor: if (cur) { cur->bc_ino.allocated = 0; xfs_btree_del_cursor(cur, error); } if (logflags) xfs_trans_log_inode(tp, ip, logflags); return error; } /* Deferred mapping is only for real extents in the data fork. */ static bool xfs_bmap_is_update_needed( struct xfs_bmbt_irec *bmap) { return bmap->br_startblock != HOLESTARTBLOCK && bmap->br_startblock != DELAYSTARTBLOCK; } /* Record a bmap intent. */ static int __xfs_bmap_add( struct xfs_trans *tp, enum xfs_bmap_intent_type type, struct xfs_inode *ip, int whichfork, struct xfs_bmbt_irec *bmap) { struct xfs_bmap_intent *bi; trace_xfs_bmap_defer(tp->t_mountp, XFS_FSB_TO_AGNO(tp->t_mountp, bmap->br_startblock), type, XFS_FSB_TO_AGBNO(tp->t_mountp, bmap->br_startblock), ip->i_ino, whichfork, bmap->br_startoff, bmap->br_blockcount, bmap->br_state); bi = kmem_cache_alloc(xfs_bmap_intent_cache, GFP_NOFS | __GFP_NOFAIL); INIT_LIST_HEAD(&bi->bi_list); bi->bi_type = type; bi->bi_owner = ip; bi->bi_whichfork = whichfork; bi->bi_bmap = *bmap; xfs_bmap_update_get_group(tp->t_mountp, bi); xfs_defer_add(tp, &bi->bi_list, &xfs_bmap_update_defer_type); return 0; } /* Map an extent into a file. */ void xfs_bmap_map_extent( struct xfs_trans *tp, struct xfs_inode *ip, struct xfs_bmbt_irec *PREV) { if (!xfs_bmap_is_update_needed(PREV)) return; __xfs_bmap_add(tp, XFS_BMAP_MAP, ip, XFS_DATA_FORK, PREV); } /* Unmap an extent out of a file. */ void xfs_bmap_unmap_extent( struct xfs_trans *tp, struct xfs_inode *ip, struct xfs_bmbt_irec *PREV) { if (!xfs_bmap_is_update_needed(PREV)) return; __xfs_bmap_add(tp, XFS_BMAP_UNMAP, ip, XFS_DATA_FORK, PREV); } /* * Process one of the deferred bmap operations. We pass back the * btree cursor to maintain our lock on the bmapbt between calls. */ int xfs_bmap_finish_one( struct xfs_trans *tp, struct xfs_bmap_intent *bi) { struct xfs_bmbt_irec *bmap = &bi->bi_bmap; int error = 0; ASSERT(tp->t_highest_agno == NULLAGNUMBER); trace_xfs_bmap_deferred(tp->t_mountp, XFS_FSB_TO_AGNO(tp->t_mountp, bmap->br_startblock), bi->bi_type, XFS_FSB_TO_AGBNO(tp->t_mountp, bmap->br_startblock), bi->bi_owner->i_ino, bi->bi_whichfork, bmap->br_startoff, bmap->br_blockcount, bmap->br_state); if (WARN_ON_ONCE(bi->bi_whichfork != XFS_DATA_FORK)) return -EFSCORRUPTED; if (XFS_TEST_ERROR(false, tp->t_mountp, XFS_ERRTAG_BMAP_FINISH_ONE)) return -EIO; switch (bi->bi_type) { case XFS_BMAP_MAP: error = xfs_bmapi_remap(tp, bi->bi_owner, bmap->br_startoff, bmap->br_blockcount, bmap->br_startblock, 0); bmap->br_blockcount = 0; break; case XFS_BMAP_UNMAP: error = __xfs_bunmapi(tp, bi->bi_owner, bmap->br_startoff, &bmap->br_blockcount, XFS_BMAPI_REMAP, 1); break; default: ASSERT(0); error = -EFSCORRUPTED; } return error; } /* Check that an extent does not have invalid flags or bad ranges. */ xfs_failaddr_t xfs_bmap_validate_extent_raw( struct xfs_mount *mp, bool rtfile, int whichfork, struct xfs_bmbt_irec *irec) { if (!xfs_verify_fileext(mp, irec->br_startoff, irec->br_blockcount)) return __this_address; if (rtfile && whichfork == XFS_DATA_FORK) { if (!xfs_verify_rtbext(mp, irec->br_startblock, irec->br_blockcount)) return __this_address; } else { if (!xfs_verify_fsbext(mp, irec->br_startblock, irec->br_blockcount)) return __this_address; } if (irec->br_state != XFS_EXT_NORM && whichfork != XFS_DATA_FORK) return __this_address; return NULL; } int __init xfs_bmap_intent_init_cache(void) { xfs_bmap_intent_cache = kmem_cache_create("xfs_bmap_intent", sizeof(struct xfs_bmap_intent), 0, 0, NULL); return xfs_bmap_intent_cache != NULL ? 0 : -ENOMEM; } void xfs_bmap_intent_destroy_cache(void) { kmem_cache_destroy(xfs_bmap_intent_cache); xfs_bmap_intent_cache = NULL; } /* Check that an inode's extent does not have invalid flags or bad ranges. */ xfs_failaddr_t xfs_bmap_validate_extent( struct xfs_inode *ip, int whichfork, struct xfs_bmbt_irec *irec) { return xfs_bmap_validate_extent_raw(ip->i_mount, XFS_IS_REALTIME_INODE(ip), whichfork, irec); } /* * Used in xfs_itruncate_extents(). This is the maximum number of extents * freed from a file in a single transaction. */ #define XFS_ITRUNC_MAX_EXTENTS 2 /* * Unmap every extent in part of an inode's fork. We don't do any higher level * invalidation work at all. */ int xfs_bunmapi_range( struct xfs_trans **tpp, struct xfs_inode *ip, uint32_t flags, xfs_fileoff_t startoff, xfs_fileoff_t endoff) { xfs_filblks_t unmap_len = endoff - startoff + 1; int error = 0; ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL)); while (unmap_len > 0) { ASSERT((*tpp)->t_highest_agno == NULLAGNUMBER); error = __xfs_bunmapi(*tpp, ip, startoff, &unmap_len, flags, XFS_ITRUNC_MAX_EXTENTS); if (error) goto out; /* free the just unmapped extents */ error = xfs_defer_finish(tpp); if (error) goto out; } out: return error; }
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