| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Dave Kleikamp | 12023 | 97.60% | 32 | 55.17% |
| Andi Kleen | 81 | 0.66% | 1 | 1.72% |
| Eric W. Biedermann | 46 | 0.37% | 1 | 1.72% |
| Joe Perches | 30 | 0.24% | 3 | 5.17% |
| Christoph Hellwig | 28 | 0.23% | 1 | 1.72% |
| Marcin Ślusarz | 18 | 0.15% | 1 | 1.72% |
| Al Viro | 16 | 0.13% | 6 | 10.34% |
| Ingo Molnar | 16 | 0.13% | 1 | 1.72% |
| Andrew Morton | 16 | 0.13% | 3 | 5.17% |
| Miklos Szeredi | 12 | 0.10% | 1 | 1.72% |
| Nickolai Zeldovich | 10 | 0.08% | 1 | 1.72% |
| Lucas De Marchi | 7 | 0.06% | 1 | 1.72% |
| Richard Knutsson | 6 | 0.05% | 1 | 1.72% |
| Tejun Heo | 3 | 0.02% | 1 | 1.72% |
| Thomas Gleixner | 2 | 0.02% | 1 | 1.72% |
| Michael Opdenacker | 2 | 0.02% | 1 | 1.72% |
| OGAWA Hirofumi | 2 | 0.02% | 1 | 1.72% |
| Li Zefan | 1 | 0.01% | 1 | 1.72% |
| Total | 12319 | 58 |
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// SPDX-License-Identifier: GPL-2.0-or-later /* * Copyright (C) International Business Machines Corp., 2000-2004 */ /* * jfs_imap.c: inode allocation map manager * * Serialization: * Each AG has a simple lock which is used to control the serialization of * the AG level lists. This lock should be taken first whenever an AG * level list will be modified or accessed. * * Each IAG is locked by obtaining the buffer for the IAG page. * * There is also a inode lock for the inode map inode. A read lock needs to * be taken whenever an IAG is read from the map or the global level * information is read. A write lock needs to be taken whenever the global * level information is modified or an atomic operation needs to be used. * * If more than one IAG is read at one time, the read lock may not * be given up until all of the IAG's are read. Otherwise, a deadlock * may occur when trying to obtain the read lock while another thread * holding the read lock is waiting on the IAG already being held. * * The control page of the inode map is read into memory by diMount(). * Thereafter it should only be modified in memory and then it will be * written out when the filesystem is unmounted by diUnmount(). */ #include <linux/fs.h> #include <linux/buffer_head.h> #include <linux/pagemap.h> #include <linux/quotaops.h> #include <linux/slab.h> #include "jfs_incore.h" #include "jfs_inode.h" #include "jfs_filsys.h" #include "jfs_dinode.h" #include "jfs_dmap.h" #include "jfs_imap.h" #include "jfs_metapage.h" #include "jfs_superblock.h" #include "jfs_debug.h" /* * imap locks */ /* iag free list lock */ #define IAGFREE_LOCK_INIT(imap) mutex_init(&imap->im_freelock) #define IAGFREE_LOCK(imap) mutex_lock(&imap->im_freelock) #define IAGFREE_UNLOCK(imap) mutex_unlock(&imap->im_freelock) /* per ag iag list locks */ #define AG_LOCK_INIT(imap,index) mutex_init(&(imap->im_aglock[index])) #define AG_LOCK(imap,agno) mutex_lock(&imap->im_aglock[agno]) #define AG_UNLOCK(imap,agno) mutex_unlock(&imap->im_aglock[agno]) /* * forward references */ static int diAllocAG(struct inomap *, int, bool, struct inode *); static int diAllocAny(struct inomap *, int, bool, struct inode *); static int diAllocBit(struct inomap *, struct iag *, int); static int diAllocExt(struct inomap *, int, struct inode *); static int diAllocIno(struct inomap *, int, struct inode *); static int diFindFree(u32, int); static int diNewExt(struct inomap *, struct iag *, int); static int diNewIAG(struct inomap *, int *, int, struct metapage **); static void duplicateIXtree(struct super_block *, s64, int, s64 *); static int diIAGRead(struct inomap * imap, int, struct metapage **); static int copy_from_dinode(struct dinode *, struct inode *); static void copy_to_dinode(struct dinode *, struct inode *); /* * NAME: diMount() * * FUNCTION: initialize the incore inode map control structures for * a fileset or aggregate init time. * * the inode map's control structure (dinomap) is * brought in from disk and placed in virtual memory. * * PARAMETERS: * ipimap - pointer to inode map inode for the aggregate or fileset. * * RETURN VALUES: * 0 - success * -ENOMEM - insufficient free virtual memory. * -EIO - i/o error. */ int diMount(struct inode *ipimap) { struct inomap *imap; struct metapage *mp; int index; struct dinomap_disk *dinom_le; /* * allocate/initialize the in-memory inode map control structure */ /* allocate the in-memory inode map control structure. */ imap = kmalloc(sizeof(struct inomap), GFP_KERNEL); if (imap == NULL) { jfs_err("diMount: kmalloc returned NULL!"); return -ENOMEM; } /* read the on-disk inode map control structure. */ mp = read_metapage(ipimap, IMAPBLKNO << JFS_SBI(ipimap->i_sb)->l2nbperpage, PSIZE, 0); if (mp == NULL) { kfree(imap); return -EIO; } /* copy the on-disk version to the in-memory version. */ dinom_le = (struct dinomap_disk *) mp->data; imap->im_freeiag = le32_to_cpu(dinom_le->in_freeiag); imap->im_nextiag = le32_to_cpu(dinom_le->in_nextiag); atomic_set(&imap->im_numinos, le32_to_cpu(dinom_le->in_numinos)); atomic_set(&imap->im_numfree, le32_to_cpu(dinom_le->in_numfree)); imap->im_nbperiext = le32_to_cpu(dinom_le->in_nbperiext); imap->im_l2nbperiext = le32_to_cpu(dinom_le->in_l2nbperiext); for (index = 0; index < MAXAG; index++) { imap->im_agctl[index].inofree = le32_to_cpu(dinom_le->in_agctl[index].inofree); imap->im_agctl[index].extfree = le32_to_cpu(dinom_le->in_agctl[index].extfree); imap->im_agctl[index].numinos = le32_to_cpu(dinom_le->in_agctl[index].numinos); imap->im_agctl[index].numfree = le32_to_cpu(dinom_le->in_agctl[index].numfree); } /* release the buffer. */ release_metapage(mp); /* * allocate/initialize inode allocation map locks */ /* allocate and init iag free list lock */ IAGFREE_LOCK_INIT(imap); /* allocate and init ag list locks */ for (index = 0; index < MAXAG; index++) { AG_LOCK_INIT(imap, index); } /* bind the inode map inode and inode map control structure * to each other. */ imap->im_ipimap = ipimap; JFS_IP(ipimap)->i_imap = imap; return (0); } /* * NAME: diUnmount() * * FUNCTION: write to disk the incore inode map control structures for * a fileset or aggregate at unmount time. * * PARAMETERS: * ipimap - pointer to inode map inode for the aggregate or fileset. * * RETURN VALUES: * 0 - success * -ENOMEM - insufficient free virtual memory. * -EIO - i/o error. */ int diUnmount(struct inode *ipimap, int mounterror) { struct inomap *imap = JFS_IP(ipimap)->i_imap; /* * update the on-disk inode map control structure */ if (!(mounterror || isReadOnly(ipimap))) diSync(ipimap); /* * Invalidate the page cache buffers */ truncate_inode_pages(ipimap->i_mapping, 0); /* * free in-memory control structure */ kfree(imap); return (0); } /* * diSync() */ int diSync(struct inode *ipimap) { struct dinomap_disk *dinom_le; struct inomap *imp = JFS_IP(ipimap)->i_imap; struct metapage *mp; int index; /* * write imap global conrol page */ /* read the on-disk inode map control structure */ mp = get_metapage(ipimap, IMAPBLKNO << JFS_SBI(ipimap->i_sb)->l2nbperpage, PSIZE, 0); if (mp == NULL) { jfs_err("diSync: get_metapage failed!"); return -EIO; } /* copy the in-memory version to the on-disk version */ dinom_le = (struct dinomap_disk *) mp->data; dinom_le->in_freeiag = cpu_to_le32(imp->im_freeiag); dinom_le->in_nextiag = cpu_to_le32(imp->im_nextiag); dinom_le->in_numinos = cpu_to_le32(atomic_read(&imp->im_numinos)); dinom_le->in_numfree = cpu_to_le32(atomic_read(&imp->im_numfree)); dinom_le->in_nbperiext = cpu_to_le32(imp->im_nbperiext); dinom_le->in_l2nbperiext = cpu_to_le32(imp->im_l2nbperiext); for (index = 0; index < MAXAG; index++) { dinom_le->in_agctl[index].inofree = cpu_to_le32(imp->im_agctl[index].inofree); dinom_le->in_agctl[index].extfree = cpu_to_le32(imp->im_agctl[index].extfree); dinom_le->in_agctl[index].numinos = cpu_to_le32(imp->im_agctl[index].numinos); dinom_le->in_agctl[index].numfree = cpu_to_le32(imp->im_agctl[index].numfree); } /* write out the control structure */ write_metapage(mp); /* * write out dirty pages of imap */ filemap_write_and_wait(ipimap->i_mapping); diWriteSpecial(ipimap, 0); return (0); } /* * NAME: diRead() * * FUNCTION: initialize an incore inode from disk. * * on entry, the specifed incore inode should itself * specify the disk inode number corresponding to the * incore inode (i.e. i_number should be initialized). * * this routine handles incore inode initialization for * both "special" and "regular" inodes. special inodes * are those required early in the mount process and * require special handling since much of the file system * is not yet initialized. these "special" inodes are * identified by a NULL inode map inode pointer and are * actually initialized by a call to diReadSpecial(). * * for regular inodes, the iag describing the disk inode * is read from disk to determine the inode extent address * for the disk inode. with the inode extent address in * hand, the page of the extent that contains the disk * inode is read and the disk inode is copied to the * incore inode. * * PARAMETERS: * ip - pointer to incore inode to be initialized from disk. * * RETURN VALUES: * 0 - success * -EIO - i/o error. * -ENOMEM - insufficient memory * */ int diRead(struct inode *ip) { struct jfs_sb_info *sbi = JFS_SBI(ip->i_sb); int iagno, ino, extno, rc; struct inode *ipimap; struct dinode *dp; struct iag *iagp; struct metapage *mp; s64 blkno, agstart; struct inomap *imap; int block_offset; int inodes_left; unsigned long pageno; int rel_inode; jfs_info("diRead: ino = %ld", ip->i_ino); ipimap = sbi->ipimap; JFS_IP(ip)->ipimap = ipimap; /* determine the iag number for this inode (number) */ iagno = INOTOIAG(ip->i_ino); /* read the iag */ imap = JFS_IP(ipimap)->i_imap; IREAD_LOCK(ipimap, RDWRLOCK_IMAP); rc = diIAGRead(imap, iagno, &mp); IREAD_UNLOCK(ipimap); if (rc) { jfs_err("diRead: diIAGRead returned %d", rc); return (rc); } iagp = (struct iag *) mp->data; /* determine inode extent that holds the disk inode */ ino = ip->i_ino & (INOSPERIAG - 1); extno = ino >> L2INOSPEREXT; if ((lengthPXD(&iagp->inoext[extno]) != imap->im_nbperiext) || (addressPXD(&iagp->inoext[extno]) == 0)) { release_metapage(mp); return -ESTALE; } /* get disk block number of the page within the inode extent * that holds the disk inode. */ blkno = INOPBLK(&iagp->inoext[extno], ino, sbi->l2nbperpage); /* get the ag for the iag */ agstart = le64_to_cpu(iagp->agstart); release_metapage(mp); rel_inode = (ino & (INOSPERPAGE - 1)); pageno = blkno >> sbi->l2nbperpage; if ((block_offset = ((u32) blkno & (sbi->nbperpage - 1)))) { /* * OS/2 didn't always align inode extents on page boundaries */ inodes_left = (sbi->nbperpage - block_offset) << sbi->l2niperblk; if (rel_inode < inodes_left) rel_inode += block_offset << sbi->l2niperblk; else { pageno += 1; rel_inode -= inodes_left; } } /* read the page of disk inode */ mp = read_metapage(ipimap, pageno << sbi->l2nbperpage, PSIZE, 1); if (!mp) { jfs_err("diRead: read_metapage failed"); return -EIO; } /* locate the disk inode requested */ dp = (struct dinode *) mp->data; dp += rel_inode; if (ip->i_ino != le32_to_cpu(dp->di_number)) { jfs_error(ip->i_sb, "i_ino != di_number\n"); rc = -EIO; } else if (le32_to_cpu(dp->di_nlink) == 0) rc = -ESTALE; else /* copy the disk inode to the in-memory inode */ rc = copy_from_dinode(dp, ip); release_metapage(mp); /* set the ag for the inode */ JFS_IP(ip)->agstart = agstart; JFS_IP(ip)->active_ag = -1; return (rc); } /* * NAME: diReadSpecial() * * FUNCTION: initialize a 'special' inode from disk. * * this routines handles aggregate level inodes. The * inode cache cannot differentiate between the * aggregate inodes and the filesystem inodes, so we * handle these here. We don't actually use the aggregate * inode map, since these inodes are at a fixed location * and in some cases the aggregate inode map isn't initialized * yet. * * PARAMETERS: * sb - filesystem superblock * inum - aggregate inode number * secondary - 1 if secondary aggregate inode table * * RETURN VALUES: * new inode - success * NULL - i/o error. */ struct inode *diReadSpecial(struct super_block *sb, ino_t inum, int secondary) { struct jfs_sb_info *sbi = JFS_SBI(sb); uint address; struct dinode *dp; struct inode *ip; struct metapage *mp; ip = new_inode(sb); if (ip == NULL) { jfs_err("diReadSpecial: new_inode returned NULL!"); return ip; } if (secondary) { address = addressPXD(&sbi->ait2) >> sbi->l2nbperpage; JFS_IP(ip)->ipimap = sbi->ipaimap2; } else { address = AITBL_OFF >> L2PSIZE; JFS_IP(ip)->ipimap = sbi->ipaimap; } ASSERT(inum < INOSPEREXT); ip->i_ino = inum; address += inum >> 3; /* 8 inodes per 4K page */ /* read the page of fixed disk inode (AIT) in raw mode */ mp = read_metapage(ip, address << sbi->l2nbperpage, PSIZE, 1); if (mp == NULL) { set_nlink(ip, 1); /* Don't want iput() deleting it */ iput(ip); return (NULL); } /* get the pointer to the disk inode of interest */ dp = (struct dinode *) (mp->data); dp += inum % 8; /* 8 inodes per 4K page */ /* copy on-disk inode to in-memory inode */ if ((copy_from_dinode(dp, ip)) != 0) { /* handle bad return by returning NULL for ip */ set_nlink(ip, 1); /* Don't want iput() deleting it */ iput(ip); /* release the page */ release_metapage(mp); return (NULL); } ip->i_mapping->a_ops = &jfs_metapage_aops; mapping_set_gfp_mask(ip->i_mapping, GFP_NOFS); /* Allocations to metadata inodes should not affect quotas */ ip->i_flags |= S_NOQUOTA; if ((inum == FILESYSTEM_I) && (JFS_IP(ip)->ipimap == sbi->ipaimap)) { sbi->gengen = le32_to_cpu(dp->di_gengen); sbi->inostamp = le32_to_cpu(dp->di_inostamp); } /* release the page */ release_metapage(mp); inode_fake_hash(ip); return (ip); } /* * NAME: diWriteSpecial() * * FUNCTION: Write the special inode to disk * * PARAMETERS: * ip - special inode * secondary - 1 if secondary aggregate inode table * * RETURN VALUES: none */ void diWriteSpecial(struct inode *ip, int secondary) { struct jfs_sb_info *sbi = JFS_SBI(ip->i_sb); uint address; struct dinode *dp; ino_t inum = ip->i_ino; struct metapage *mp; if (secondary) address = addressPXD(&sbi->ait2) >> sbi->l2nbperpage; else address = AITBL_OFF >> L2PSIZE; ASSERT(inum < INOSPEREXT); address += inum >> 3; /* 8 inodes per 4K page */ /* read the page of fixed disk inode (AIT) in raw mode */ mp = read_metapage(ip, address << sbi->l2nbperpage, PSIZE, 1); if (mp == NULL) { jfs_err("diWriteSpecial: failed to read aggregate inode extent!"); return; } /* get the pointer to the disk inode of interest */ dp = (struct dinode *) (mp->data); dp += inum % 8; /* 8 inodes per 4K page */ /* copy on-disk inode to in-memory inode */ copy_to_dinode(dp, ip); memcpy(&dp->di_xtroot, &JFS_IP(ip)->i_xtroot, 288); if (inum == FILESYSTEM_I) dp->di_gengen = cpu_to_le32(sbi->gengen); /* write the page */ write_metapage(mp); } /* * NAME: diFreeSpecial() * * FUNCTION: Free allocated space for special inode */ void diFreeSpecial(struct inode *ip) { if (ip == NULL) { jfs_err("diFreeSpecial called with NULL ip!"); return; } filemap_write_and_wait(ip->i_mapping); truncate_inode_pages(ip->i_mapping, 0); iput(ip); } /* * NAME: diWrite() * * FUNCTION: write the on-disk inode portion of the in-memory inode * to its corresponding on-disk inode. * * on entry, the specifed incore inode should itself * specify the disk inode number corresponding to the * incore inode (i.e. i_number should be initialized). * * the inode contains the inode extent address for the disk * inode. with the inode extent address in hand, the * page of the extent that contains the disk inode is * read and the disk inode portion of the incore inode * is copied to the disk inode. * * PARAMETERS: * tid - transacation id * ip - pointer to incore inode to be written to the inode extent. * * RETURN VALUES: * 0 - success * -EIO - i/o error. */ int diWrite(tid_t tid, struct inode *ip) { struct jfs_sb_info *sbi = JFS_SBI(ip->i_sb); struct jfs_inode_info *jfs_ip = JFS_IP(ip); int rc = 0; s32 ino; struct dinode *dp; s64 blkno; int block_offset; int inodes_left; struct metapage *mp; unsigned long pageno; int rel_inode; int dioffset; struct inode *ipimap; uint type; lid_t lid; struct tlock *ditlck, *tlck; struct linelock *dilinelock, *ilinelock; struct lv *lv; int n; ipimap = jfs_ip->ipimap; ino = ip->i_ino & (INOSPERIAG - 1); if (!addressPXD(&(jfs_ip->ixpxd)) || (lengthPXD(&(jfs_ip->ixpxd)) != JFS_IP(ipimap)->i_imap->im_nbperiext)) { jfs_error(ip->i_sb, "ixpxd invalid\n"); return -EIO; } /* * read the page of disk inode containing the specified inode: */ /* compute the block address of the page */ blkno = INOPBLK(&(jfs_ip->ixpxd), ino, sbi->l2nbperpage); rel_inode = (ino & (INOSPERPAGE - 1)); pageno = blkno >> sbi->l2nbperpage; if ((block_offset = ((u32) blkno & (sbi->nbperpage - 1)))) { /* * OS/2 didn't always align inode extents on page boundaries */ inodes_left = (sbi->nbperpage - block_offset) << sbi->l2niperblk; if (rel_inode < inodes_left) rel_inode += block_offset << sbi->l2niperblk; else { pageno += 1; rel_inode -= inodes_left; } } /* read the page of disk inode */ retry: mp = read_metapage(ipimap, pageno << sbi->l2nbperpage, PSIZE, 1); if (!mp) return -EIO; /* get the pointer to the disk inode */ dp = (struct dinode *) mp->data; dp += rel_inode; dioffset = (ino & (INOSPERPAGE - 1)) << L2DISIZE; /* * acquire transaction lock on the on-disk inode; * N.B. tlock is acquired on ipimap not ip; */ if ((ditlck = txLock(tid, ipimap, mp, tlckINODE | tlckENTRY)) == NULL) goto retry; dilinelock = (struct linelock *) & ditlck->lock; /* * copy btree root from in-memory inode to on-disk inode * * (tlock is taken from inline B+-tree root in in-memory * inode when the B+-tree root is updated, which is pointed * by jfs_ip->blid as well as being on tx tlock list) * * further processing of btree root is based on the copy * in in-memory inode, where txLog() will log from, and, * for xtree root, txUpdateMap() will update map and reset * XAD_NEW bit; */ if (S_ISDIR(ip->i_mode) && (lid = jfs_ip->xtlid)) { /* * This is the special xtree inside the directory for storing * the directory table */ xtpage_t *p, *xp; xad_t *xad; jfs_ip->xtlid = 0; tlck = lid_to_tlock(lid); assert(tlck->type & tlckXTREE); tlck->type |= tlckBTROOT; tlck->mp = mp; ilinelock = (struct linelock *) & tlck->lock; /* * copy xtree root from inode to dinode: */ p = &jfs_ip->i_xtroot; xp = (xtpage_t *) &dp->di_dirtable; lv = ilinelock->lv; for (n = 0; n < ilinelock->index; n++, lv++) { memcpy(&xp->xad[lv->offset], &p->xad[lv->offset], lv->length << L2XTSLOTSIZE); } /* reset on-disk (metadata page) xtree XAD_NEW bit */ xad = &xp->xad[XTENTRYSTART]; for (n = XTENTRYSTART; n < le16_to_cpu(xp->header.nextindex); n++, xad++) if (xad->flag & (XAD_NEW | XAD_EXTENDED)) xad->flag &= ~(XAD_NEW | XAD_EXTENDED); } if ((lid = jfs_ip->blid) == 0) goto inlineData; jfs_ip->blid = 0; tlck = lid_to_tlock(lid); type = tlck->type; tlck->type |= tlckBTROOT; tlck->mp = mp; ilinelock = (struct linelock *) & tlck->lock; /* * regular file: 16 byte (XAD slot) granularity */ if (type & tlckXTREE) { xtpage_t *p, *xp; xad_t *xad; /* * copy xtree root from inode to dinode: */ p = &jfs_ip->i_xtroot; xp = &dp->di_xtroot; lv = ilinelock->lv; for (n = 0; n < ilinelock->index; n++, lv++) { memcpy(&xp->xad[lv->offset], &p->xad[lv->offset], lv->length << L2XTSLOTSIZE); } /* reset on-disk (metadata page) xtree XAD_NEW bit */ xad = &xp->xad[XTENTRYSTART]; for (n = XTENTRYSTART; n < le16_to_cpu(xp->header.nextindex); n++, xad++) if (xad->flag & (XAD_NEW | XAD_EXTENDED)) xad->flag &= ~(XAD_NEW | XAD_EXTENDED); } /* * directory: 32 byte (directory entry slot) granularity */ else if (type & tlckDTREE) { dtpage_t *p, *xp; /* * copy dtree root from inode to dinode: */ p = (dtpage_t *) &jfs_ip->i_dtroot; xp = (dtpage_t *) & dp->di_dtroot; lv = ilinelock->lv; for (n = 0; n < ilinelock->index; n++, lv++) { memcpy(&xp->slot[lv->offset], &p->slot[lv->offset], lv->length << L2DTSLOTSIZE); } } else { jfs_err("diWrite: UFO tlock"); } inlineData: /* * copy inline symlink from in-memory inode to on-disk inode */ if (S_ISLNK(ip->i_mode) && ip->i_size < IDATASIZE) { lv = & dilinelock->lv[dilinelock->index]; lv->offset = (dioffset + 2 * 128) >> L2INODESLOTSIZE; lv->length = 2; memcpy(&dp->di_fastsymlink, jfs_ip->i_inline, IDATASIZE); dilinelock->index++; } /* * copy inline data from in-memory inode to on-disk inode: * 128 byte slot granularity */ if (test_cflag(COMMIT_Inlineea, ip)) { lv = & dilinelock->lv[dilinelock->index]; lv->offset = (dioffset + 3 * 128) >> L2INODESLOTSIZE; lv->length = 1; memcpy(&dp->di_inlineea, jfs_ip->i_inline_ea, INODESLOTSIZE); dilinelock->index++; clear_cflag(COMMIT_Inlineea, ip); } /* * lock/copy inode base: 128 byte slot granularity */ lv = & dilinelock->lv[dilinelock->index]; lv->offset = dioffset >> L2INODESLOTSIZE; copy_to_dinode(dp, ip); if (test_and_clear_cflag(COMMIT_Dirtable, ip)) { lv->length = 2; memcpy(&dp->di_dirtable, &jfs_ip->i_dirtable, 96); } else lv->length = 1; dilinelock->index++; /* release the buffer holding the updated on-disk inode. * the buffer will be later written by commit processing. */ write_metapage(mp); return (rc); } /* * NAME: diFree(ip) * * FUNCTION: free a specified inode from the inode working map * for a fileset or aggregate. * * if the inode to be freed represents the first (only) * free inode within the iag, the iag will be placed on * the ag free inode list. * * freeing the inode will cause the inode extent to be * freed if the inode is the only allocated inode within * the extent. in this case all the disk resource backing * up the inode extent will be freed. in addition, the iag * will be placed on the ag extent free list if the extent * is the first free extent in the iag. if freeing the * extent also means that no free inodes will exist for * the iag, the iag will also be removed from the ag free * inode list. * * the iag describing the inode will be freed if the extent * is to be freed and it is the only backed extent within * the iag. in this case, the iag will be removed from the * ag free extent list and ag free inode list and placed on * the inode map's free iag list. * * a careful update approach is used to provide consistency * in the face of updates to multiple buffers. under this * approach, all required buffers are obtained before making * any updates and are held until all updates are complete. * * PARAMETERS: * ip - inode to be freed. * * RETURN VALUES: * 0 - success * -EIO - i/o error. */ int diFree(struct inode *ip) { int rc; ino_t inum = ip->i_ino; struct iag *iagp, *aiagp, *biagp, *ciagp, *diagp; struct metapage *mp, *amp, *bmp, *cmp, *dmp; int iagno, ino, extno, bitno, sword, agno; int back, fwd; u32 bitmap, mask; struct inode *ipimap = JFS_SBI(ip->i_sb)->ipimap; struct inomap *imap = JFS_IP(ipimap)->i_imap; pxd_t freepxd; tid_t tid; struct inode *iplist[3]; struct tlock *tlck; struct pxd_lock *pxdlock; /* * This is just to suppress compiler warnings. The same logic that * references these variables is used to initialize them. */ aiagp = biagp = ciagp = diagp = NULL; /* get the iag number containing the inode. */ iagno = INOTOIAG(inum); /* make sure that the iag is contained within * the map. */ if (iagno >= imap->im_nextiag) { print_hex_dump(KERN_ERR, "imap: ", DUMP_PREFIX_ADDRESS, 16, 4, imap, 32, 0); jfs_error(ip->i_sb, "inum = %d, iagno = %d, nextiag = %d\n", (uint) inum, iagno, imap->im_nextiag); return -EIO; } /* get the allocation group for this ino. */ agno = BLKTOAG(JFS_IP(ip)->agstart, JFS_SBI(ip->i_sb)); /* Lock the AG specific inode map information */ AG_LOCK(imap, agno); /* Obtain read lock in imap inode. Don't release it until we have * read all of the IAG's that we are going to. */ IREAD_LOCK(ipimap, RDWRLOCK_IMAP); /* read the iag. */ if ((rc = diIAGRead(imap, iagno, &mp))) { IREAD_UNLOCK(ipimap); AG_UNLOCK(imap, agno); return (rc); } iagp = (struct iag *) mp->data; /* get the inode number and extent number of the inode within * the iag and the inode number within the extent. */ ino = inum & (INOSPERIAG - 1); extno = ino >> L2INOSPEREXT; bitno = ino & (INOSPEREXT - 1); mask = HIGHORDER >> bitno; if (!(le32_to_cpu(iagp->wmap[extno]) & mask)) { jfs_error(ip->i_sb, "wmap shows inode already free\n"); } if (!addressPXD(&iagp->inoext[extno])) { release_metapage(mp); IREAD_UNLOCK(ipimap); AG_UNLOCK(imap, agno); jfs_error(ip->i_sb, "invalid inoext\n"); return -EIO; } /* compute the bitmap for the extent reflecting the freed inode. */ bitmap = le32_to_cpu(iagp->wmap[extno]) & ~mask; if (imap->im_agctl[agno].numfree > imap->im_agctl[agno].numinos) { release_metapage(mp); IREAD_UNLOCK(ipimap); AG_UNLOCK(imap, agno); jfs_error(ip->i_sb, "numfree > numinos\n"); return -EIO; } /* * inode extent still has some inodes or below low water mark: * keep the inode extent; */ if (bitmap || imap->im_agctl[agno].numfree < 96 || (imap->im_agctl[agno].numfree < 288 && (((imap->im_agctl[agno].numfree * 100) / imap->im_agctl[agno].numinos) <= 25))) { /* if the iag currently has no free inodes (i.e., * the inode being freed is the first free inode of iag), * insert the iag at head of the inode free list for the ag. */ if (iagp->nfreeinos == 0) { /* check if there are any iags on the ag inode * free list. if so, read the first one so that * we can link the current iag onto the list at * the head. */ if ((fwd = imap->im_agctl[agno].inofree) >= 0) { /* read the iag that currently is the head * of the list. */ if ((rc = diIAGRead(imap, fwd, &))) { IREAD_UNLOCK(ipimap); AG_UNLOCK(imap, agno); release_metapage(mp); return (rc); } aiagp = (struct iag *) amp->data; /* make current head point back to the iag. */ aiagp->inofreeback = cpu_to_le32(iagno); write_metapage(amp); } /* iag points forward to current head and iag * becomes the new head of the list. */ iagp->inofreefwd = cpu_to_le32(imap->im_agctl[agno].inofree); iagp->inofreeback = cpu_to_le32(-1); imap->im_agctl[agno].inofree = iagno; } IREAD_UNLOCK(ipimap); /* update the free inode summary map for the extent if * freeing the inode means the extent will now have free * inodes (i.e., the inode being freed is the first free * inode of extent), */ if (iagp->wmap[extno] == cpu_to_le32(ONES)) { sword = extno >> L2EXTSPERSUM; bitno = extno & (EXTSPERSUM - 1); iagp->inosmap[sword] &= cpu_to_le32(~(HIGHORDER >> bitno)); } /* update the bitmap. */ iagp->wmap[extno] = cpu_to_le32(bitmap); /* update the free inode counts at the iag, ag and * map level. */ le32_add_cpu(&iagp->nfreeinos, 1); imap->im_agctl[agno].numfree += 1; atomic_inc(&imap->im_numfree); /* release the AG inode map lock */ AG_UNLOCK(imap, agno); /* write the iag */ write_metapage(mp); return (0); } /* * inode extent has become free and above low water mark: * free the inode extent; */ /* * prepare to update iag list(s) (careful update step 1) */ amp = bmp = cmp = dmp = NULL; fwd = back = -1; /* check if the iag currently has no free extents. if so, * it will be placed on the head of the ag extent free list. */ if (iagp->nfreeexts == 0) { /* check if the ag extent free list has any iags. * if so, read the iag at the head of the list now. * this (head) iag will be updated later to reflect * the addition of the current iag at the head of * the list. */ if ((fwd = imap->im_agctl[agno].extfree) >= 0) { if ((rc = diIAGRead(imap, fwd, &))) goto error_out; aiagp = (struct iag *) amp->data; } } else { /* iag has free extents. check if the addition of a free * extent will cause all extents to be free within this * iag. if so, the iag will be removed from the ag extent * free list and placed on the inode map's free iag list. */ if (iagp->nfreeexts == cpu_to_le32(EXTSPERIAG - 1)) { /* in preparation for removing the iag from the * ag extent free list, read the iags preceding * and following the iag on the ag extent free * list. */ if ((fwd = le32_to_cpu(iagp->extfreefwd)) >= 0) { if ((rc = diIAGRead(imap, fwd, &))) goto error_out; aiagp = (struct iag *) amp->data; } if ((back = le32_to_cpu(iagp->extfreeback)) >= 0) { if ((rc = diIAGRead(imap, back, &bmp))) goto error_out; biagp = (struct iag *) bmp->data; } } } /* remove the iag from the ag inode free list if freeing * this extent cause the iag to have no free inodes. */ if (iagp->nfreeinos == cpu_to_le32(INOSPEREXT - 1)) { int inofreeback = le32_to_cpu(iagp->inofreeback); int inofreefwd = le32_to_cpu(iagp->inofreefwd); /* in preparation for removing the iag from the * ag inode free list, read the iags preceding * and following the iag on the ag inode free * list. before reading these iags, we must make * sure that we already don't have them in hand * from up above, since re-reading an iag (buffer) * we are currently holding would cause a deadlock. */ if (inofreefwd >= 0) { if (inofreefwd == fwd) ciagp = (struct iag *) amp->data; else if (inofreefwd == back) ciagp = (struct iag *) bmp->data; else { if ((rc = diIAGRead(imap, inofreefwd, &cmp))) goto error_out; ciagp = (struct iag *) cmp->data; } assert(ciagp != NULL); } if (inofreeback >= 0) { if (inofreeback == fwd) diagp = (struct iag *) amp->data; else if (inofreeback == back) diagp = (struct iag *) bmp->data; else { if ((rc = diIAGRead(imap, inofreeback, &dmp))) goto error_out; diagp = (struct iag *) dmp->data; } assert(diagp != NULL); } } IREAD_UNLOCK(ipimap); /* * invalidate any page of the inode extent freed from buffer cache; */ freepxd = iagp->inoext[extno]; invalidate_pxd_metapages(ip, freepxd); /* * update iag list(s) (careful update step 2) */ /* add the iag to the ag extent free list if this is the * first free extent for the iag. */ if (iagp->nfreeexts == 0) { if (fwd >= 0) aiagp->extfreeback = cpu_to_le32(iagno); iagp->extfreefwd = cpu_to_le32(imap->im_agctl[agno].extfree); iagp->extfreeback = cpu_to_le32(-1); imap->im_agctl[agno].extfree = iagno; } else { /* remove the iag from the ag extent list if all extents * are now free and place it on the inode map iag free list. */ if (iagp->nfreeexts == cpu_to_le32(EXTSPERIAG - 1)) { if (fwd >= 0) aiagp->extfreeback = iagp->extfreeback; if (back >= 0) biagp->extfreefwd = iagp->extfreefwd; else imap->im_agctl[agno].extfree = le32_to_cpu(iagp->extfreefwd); iagp->extfreefwd = iagp->extfreeback = cpu_to_le32(-1); IAGFREE_LOCK(imap); iagp->iagfree = cpu_to_le32(imap->im_freeiag); imap->im_freeiag = iagno; IAGFREE_UNLOCK(imap); } } /* remove the iag from the ag inode free list if freeing * this extent causes the iag to have no free inodes. */ if (iagp->nfreeinos == cpu_to_le32(INOSPEREXT - 1)) { if ((int) le32_to_cpu(iagp->inofreefwd) >= 0) ciagp->inofreeback = iagp->inofreeback; if ((int) le32_to_cpu(iagp->inofreeback) >= 0) diagp->inofreefwd = iagp->inofreefwd; else imap->im_agctl[agno].inofree = le32_to_cpu(iagp->inofreefwd); iagp->inofreefwd = iagp->inofreeback = cpu_to_le32(-1); } /* update the inode extent address and working map * to reflect the free extent. * the permanent map should have been updated already * for the inode being freed. */ if (iagp->pmap[extno] != 0) { jfs_error(ip->i_sb, "the pmap does not show inode free\n"); } iagp->wmap[extno] = 0; PXDlength(&iagp->inoext[extno], 0); PXDaddress(&iagp->inoext[extno], 0); /* update the free extent and free inode summary maps * to reflect the freed extent. * the inode summary map is marked to indicate no inodes * available for the freed extent. */ sword = extno >> L2EXTSPERSUM; bitno = extno & (EXTSPERSUM - 1); mask = HIGHORDER >> bitno; iagp->inosmap[sword] |= cpu_to_le32(mask); iagp->extsmap[sword] &= cpu_to_le32(~mask); /* update the number of free inodes and number of free extents * for the iag. */ le32_add_cpu(&iagp->nfreeinos, -(INOSPEREXT - 1)); le32_add_cpu(&iagp->nfreeexts, 1); /* update the number of free inodes and backed inodes * at the ag and inode map level. */ imap->im_agctl[agno].numfree -= (INOSPEREXT - 1); imap->im_agctl[agno].numinos -= INOSPEREXT; atomic_sub(INOSPEREXT - 1, &imap->im_numfree); atomic_sub(INOSPEREXT, &imap->im_numinos); if (amp) write_metapage(amp); if (bmp) write_metapage(bmp); if (cmp) write_metapage(cmp); if (dmp) write_metapage(dmp); /* * start transaction to update block allocation map * for the inode extent freed; * * N.B. AG_LOCK is released and iag will be released below, and * other thread may allocate inode from/reusing the ixad freed * BUT with new/different backing inode extent from the extent * to be freed by the transaction; */ tid = txBegin(ipimap->i_sb, COMMIT_FORCE); mutex_lock(&JFS_IP(ipimap)->commit_mutex); /* acquire tlock of the iag page of the freed ixad * to force the page NOHOMEOK (even though no data is * logged from the iag page) until NOREDOPAGE|FREEXTENT log * for the free of the extent is committed; * write FREEXTENT|NOREDOPAGE log record * N.B. linelock is overlaid as freed extent descriptor; */ tlck = txLock(tid, ipimap, mp, tlckINODE | tlckFREE); pxdlock = (struct pxd_lock *) & tlck->lock; pxdlock->flag = mlckFREEPXD; pxdlock->pxd = freepxd; pxdlock->index = 1; write_metapage(mp); iplist[0] = ipimap; /* * logredo needs the IAG number and IAG extent index in order * to ensure that the IMap is consistent. The least disruptive * way to pass these values through to the transaction manager * is in the iplist array. * * It's not pretty, but it works. */ iplist[1] = (struct inode *) (size_t)iagno; iplist[2] = (struct inode *) (size_t)extno; rc = txCommit(tid, 1, &iplist[0], COMMIT_FORCE); txEnd(tid); mutex_unlock(&JFS_IP(ipimap)->commit_mutex); /* unlock the AG inode map information */ AG_UNLOCK(imap, agno); return (0); error_out: IREAD_UNLOCK(ipimap); if (amp) release_metapage(amp); if (bmp) release_metapage(bmp); if (cmp) release_metapage(cmp); if (dmp) release_metapage(dmp); AG_UNLOCK(imap, agno); release_metapage(mp); return (rc); } /* * There are several places in the diAlloc* routines where we initialize * the inode. */ static inline void diInitInode(struct inode *ip, int iagno, int ino, int extno, struct iag * iagp) { struct jfs_inode_info *jfs_ip = JFS_IP(ip); ip->i_ino = (iagno << L2INOSPERIAG) + ino; jfs_ip->ixpxd = iagp->inoext[extno]; jfs_ip->agstart = le64_to_cpu(iagp->agstart); jfs_ip->active_ag = -1; } /* * NAME: diAlloc(pip,dir,ip) * * FUNCTION: allocate a disk inode from the inode working map * for a fileset or aggregate. * * PARAMETERS: * pip - pointer to incore inode for the parent inode. * dir - 'true' if the new disk inode is for a directory. * ip - pointer to a new inode * * RETURN VALUES: * 0 - success. * -ENOSPC - insufficient disk resources. * -EIO - i/o error. */ int diAlloc(struct inode *pip, bool dir, struct inode *ip) { int rc, ino, iagno, addext, extno, bitno, sword; int nwords, rem, i, agno; u32 mask, inosmap, extsmap; struct inode *ipimap; struct metapage *mp; ino_t inum; struct iag *iagp; struct inomap *imap; /* get the pointers to the inode map inode and the * corresponding imap control structure. */ ipimap = JFS_SBI(pip->i_sb)->ipimap; imap = JFS_IP(ipimap)->i_imap; JFS_IP(ip)->ipimap = ipimap; JFS_IP(ip)->fileset = FILESYSTEM_I; /* for a directory, the allocation policy is to start * at the ag level using the preferred ag. */ if (dir) { agno = dbNextAG(JFS_SBI(pip->i_sb)->ipbmap); AG_LOCK(imap, agno); goto tryag; } /* for files, the policy starts off by trying to allocate from * the same iag containing the parent disk inode: * try to allocate the new disk inode close to the parent disk * inode, using parent disk inode number + 1 as the allocation * hint. (we use a left-to-right policy to attempt to avoid * moving backward on the disk.) compute the hint within the * file system and the iag. */ /* get the ag number of this iag */ agno = BLKTOAG(JFS_IP(pip)->agstart, JFS_SBI(pip->i_sb)); if (atomic_read(&JFS_SBI(pip->i_sb)->bmap->db_active[agno])) { /* * There is an open file actively growing. We want to * allocate new inodes from a different ag to avoid * fragmentation problems. */ agno = dbNextAG(JFS_SBI(pip->i_sb)->ipbmap); AG_LOCK(imap, agno); goto tryag; } inum = pip->i_ino + 1; ino = inum & (INOSPERIAG - 1); /* back off the hint if it is outside of the iag */ if (ino == 0) inum = pip->i_ino; /* lock the AG inode map information */ AG_LOCK(imap, agno); /* Get read lock on imap inode */ IREAD_LOCK(ipimap, RDWRLOCK_IMAP); /* get the iag number and read the iag */ iagno = INOTOIAG(inum); if ((rc = diIAGRead(imap, iagno, &mp))) { IREAD_UNLOCK(ipimap); AG_UNLOCK(imap, agno); return (rc); } iagp = (struct iag *) mp->data; /* determine if new inode extent is allowed to be added to the iag. * new inode extent can be added to the iag if the ag * has less than 32 free disk inodes and the iag has free extents. */ addext = (imap->im_agctl[agno].numfree < 32 && iagp->nfreeexts); /* * try to allocate from the IAG */ /* check if the inode may be allocated from the iag * (i.e. the inode has free inodes or new extent can be added). */ if (iagp->nfreeinos || addext) { /* determine the extent number of the hint. */ extno = ino >> L2INOSPEREXT; /* check if the extent containing the hint has backed * inodes. if so, try to allocate within this extent. */ if (addressPXD(&iagp->inoext[extno])) { bitno = ino & (INOSPEREXT - 1); if ((bitno = diFindFree(le32_to_cpu(iagp->wmap[extno]), bitno)) < INOSPEREXT) { ino = (extno << L2INOSPEREXT) + bitno; /* a free inode (bit) was found within this * extent, so allocate it. */ rc = diAllocBit(imap, iagp, ino); IREAD_UNLOCK(ipimap); if (rc) { assert(rc == -EIO); } else { /* set the results of the allocation * and write the iag. */ diInitInode(ip, iagno, ino, extno, iagp); mark_metapage_dirty(mp); } release_metapage(mp); /* free the AG lock and return. */ AG_UNLOCK(imap, agno); return (rc); } if (!addext) extno = (extno == EXTSPERIAG - 1) ? 0 : extno + 1; } /* * no free inodes within the extent containing the hint. * * try to allocate from the backed extents following * hint or, if appropriate (i.e. addext is true), allocate * an extent of free inodes at or following the extent * containing the hint. * * the free inode and free extent summary maps are used * here, so determine the starting summary map position * and the number of words we'll have to examine. again, * the approach is to allocate following the hint, so we * might have to initially ignore prior bits of the summary * map that represent extents prior to the extent containing * the hint and later revisit these bits. */ bitno = extno & (EXTSPERSUM - 1); nwords = (bitno == 0) ? SMAPSZ : SMAPSZ + 1; sword = extno >> L2EXTSPERSUM; /* mask any prior bits for the starting words of the * summary map. */ mask = (bitno == 0) ? 0 : (ONES << (EXTSPERSUM - bitno)); inosmap = le32_to_cpu(iagp->inosmap[sword]) | mask; extsmap = le32_to_cpu(iagp->extsmap[sword]) | mask; /* scan the free inode and free extent summary maps for * free resources. */ for (i = 0; i < nwords; i++) { /* check if this word of the free inode summary * map describes an extent with free inodes. */ if (~inosmap) { /* an extent with free inodes has been * found. determine the extent number * and the inode number within the extent. */ rem = diFindFree(inosmap, 0); extno = (sword << L2EXTSPERSUM) + rem; rem = diFindFree(le32_to_cpu(iagp->wmap[extno]), 0); if (rem >= INOSPEREXT) { IREAD_UNLOCK(ipimap); release_metapage(mp); AG_UNLOCK(imap, agno); jfs_error(ip->i_sb, "can't find free bit in wmap\n"); return -EIO; } /* determine the inode number within the * iag and allocate the inode from the * map. */ ino = (extno << L2INOSPEREXT) + rem; rc = diAllocBit(imap, iagp, ino); IREAD_UNLOCK(ipimap); if (rc) assert(rc == -EIO); else { /* set the results of the allocation * and write the iag. */ diInitInode(ip, iagno, ino, extno, iagp); mark_metapage_dirty(mp); } release_metapage(mp); /* free the AG lock and return. */ AG_UNLOCK(imap, agno); return (rc); } /* check if we may allocate an extent of free * inodes and whether this word of the free * extents summary map describes a free extent. */ if (addext && ~extsmap) { /* a free extent has been found. determine * the extent number. */ rem = diFindFree(extsmap, 0); extno = (sword << L2EXTSPERSUM) + rem; /* allocate an extent of free inodes. */ if ((rc = diNewExt(imap, iagp, extno))) { /* if there is no disk space for a * new extent, try to allocate the * disk inode from somewhere else. */ if (rc == -ENOSPC) break; assert(rc == -EIO); } else { /* set the results of the allocation * and write the iag. */ diInitInode(ip, iagno, extno << L2INOSPEREXT, extno, iagp); mark_metapage_dirty(mp); } release_metapage(mp); /* free the imap inode & the AG lock & return. */ IREAD_UNLOCK(ipimap); AG_UNLOCK(imap, agno); return (rc); } /* move on to the next set of summary map words. */ sword = (sword == SMAPSZ - 1) ? 0 : sword + 1; inosmap = le32_to_cpu(iagp->inosmap[sword]); extsmap = le32_to_cpu(iagp->extsmap[sword]); } } /* unlock imap inode */ IREAD_UNLOCK(ipimap); /* nothing doing in this iag, so release it. */ release_metapage(mp); tryag: /* * try to allocate anywhere within the same AG as the parent inode. */ rc = diAllocAG(imap, agno, dir, ip); AG_UNLOCK(imap, agno); if (rc != -ENOSPC) return (rc); /* * try to allocate in any AG. */ return (diAllocAny(imap, agno, dir, ip)); } /* * NAME: diAllocAG(imap,agno,dir,ip) * * FUNCTION: allocate a disk inode from the allocation group. * * this routine first determines if a new extent of free * inodes should be added for the allocation group, with * the current request satisfied from this extent. if this * is the case, an attempt will be made to do just that. if * this attempt fails or it has been determined that a new * extent should not be added, an attempt is made to satisfy * the request by allocating an existing (backed) free inode * from the allocation group. * * PRE CONDITION: Already have the AG lock for this AG. * * PARAMETERS: * imap - pointer to inode map control structure. * agno - allocation group to allocate from. * dir - 'true' if the new disk inode is for a directory. * ip - pointer to the new inode to be filled in on successful return * with the disk inode number allocated, its extent address * and the start of the ag. * * RETURN VALUES: * 0 - success. * -ENOSPC - insufficient disk resources. * -EIO - i/o error. */ static int diAllocAG(struct inomap * imap, int agno, bool dir, struct inode *ip) { int rc, addext, numfree, numinos; /* get the number of free and the number of backed disk * inodes currently within the ag. */ numfree = imap->im_agctl[agno].numfree; numinos = imap->im_agctl[agno].numinos; if (numfree > numinos) { jfs_error(ip->i_sb, "numfree > numinos\n"); return -EIO; } /* determine if we should allocate a new extent of free inodes * within the ag: for directory inodes, add a new extent * if there are a small number of free inodes or number of free * inodes is a small percentage of the number of backed inodes. */ if (dir) addext = (numfree < 64 || (numfree < 256 && ((numfree * 100) / numinos) <= 20)); else addext = (numfree == 0); /* * try to allocate a new extent of free inodes. */ if (addext) { /* if free space is not available for this new extent, try * below to allocate a free and existing (already backed) * inode from the ag. */ if ((rc = diAllocExt(imap, agno, ip)) != -ENOSPC) return (rc); } /* * try to allocate an existing free inode from the ag. */ return (diAllocIno(imap, agno, ip)); } /* * NAME: diAllocAny(imap,agno,dir,iap) * * FUNCTION: allocate a disk inode from any other allocation group. * * this routine is called when an allocation attempt within * the primary allocation group has failed. if attempts to * allocate an inode from any allocation group other than the * specified primary group. * * PARAMETERS: * imap - pointer to inode map control structure. * agno - primary allocation group (to avoid). * dir - 'true' if the new disk inode is for a directory. * ip - pointer to a new inode to be filled in on successful return * with the disk inode number allocated, its extent address * and the start of the ag. * * RETURN VALUES: * 0 - success. * -ENOSPC - insufficient disk resources. * -EIO - i/o error. */ static int diAllocAny(struct inomap * imap, int agno, bool dir, struct inode *ip) { int ag, rc; int maxag = JFS_SBI(imap->im_ipimap->i_sb)->bmap->db_maxag; /* try to allocate from the ags following agno up to * the maximum ag number. */ for (ag = agno + 1; ag <= maxag; ag++) { AG_LOCK(imap, ag); rc = diAllocAG(imap, ag, dir, ip); AG_UNLOCK(imap, ag); if (rc != -ENOSPC) return (rc); } /* try to allocate from the ags in front of agno. */ for (ag = 0; ag < agno; ag++) { AG_LOCK(imap, ag); rc = diAllocAG(imap, ag, dir, ip); AG_UNLOCK(imap, ag); if (rc != -ENOSPC) return (rc); } /* no free disk inodes. */ return -ENOSPC; } /* * NAME: diAllocIno(imap,agno,ip) * * FUNCTION: allocate a disk inode from the allocation group's free * inode list, returning an error if this free list is * empty (i.e. no iags on the list). * * allocation occurs from the first iag on the list using * the iag's free inode summary map to find the leftmost * free inode in the iag. * * PRE CONDITION: Already have AG lock for this AG. * * PARAMETERS: * imap - pointer to inode map control structure. * agno - allocation group. * ip - pointer to new inode to be filled in on successful return * with the disk inode number allocated, its extent address * and the start of the ag. * * RETURN VALUES: * 0 - success. * -ENOSPC - insufficient disk resources. * -EIO - i/o error. */ static int diAllocIno(struct inomap * imap, int agno, struct inode *ip) { int iagno, ino, rc, rem, extno, sword; struct metapage *mp; struct iag *iagp; /* check if there are iags on the ag's free inode list. */ if ((iagno = imap->im_agctl[agno].inofree) < 0) return -ENOSPC; /* obtain read lock on imap inode */ IREAD_LOCK(imap->im_ipimap, RDWRLOCK_IMAP); /* read the iag at the head of the list. */ if ((rc = diIAGRead(imap, iagno, &mp))) { IREAD_UNLOCK(imap->im_ipimap); return (rc); } iagp = (struct iag *) mp->data; /* better be free inodes in this iag if it is on the * list. */ if (!iagp->nfreeinos) { IREAD_UNLOCK(imap->im_ipimap); release_metapage(mp); jfs_error(ip->i_sb, "nfreeinos = 0, but iag on freelist\n"); return -EIO; } /* scan the free inode summary map to find an extent * with free inodes. */ for (sword = 0;; sword++) { if (sword >= SMAPSZ) { IREAD_UNLOCK(imap->im_ipimap); release_metapage(mp); jfs_error(ip->i_sb, "free inode not found in summary map\n"); return -EIO; } if (~iagp->inosmap[sword]) break; } /* found a extent with free inodes. determine * the extent number. */ rem = diFindFree(le32_to_cpu(iagp->inosmap[sword]), 0); if (rem >= EXTSPERSUM) { IREAD_UNLOCK(imap->im_ipimap); release_metapage(mp); jfs_error(ip->i_sb, "no free extent found\n"); return -EIO; } extno = (sword << L2EXTSPERSUM) + rem; /* find the first free inode in the extent. */ rem = diFindFree(le32_to_cpu(iagp->wmap[extno]), 0); if (rem >= INOSPEREXT) { IREAD_UNLOCK(imap->im_ipimap); release_metapage(mp); jfs_error(ip->i_sb, "free inode not found\n"); return -EIO; } /* compute the inode number within the iag. */ ino = (extno << L2INOSPEREXT) + rem; /* allocate the inode. */ rc = diAllocBit(imap, iagp, ino); IREAD_UNLOCK(imap->im_ipimap); if (rc) { release_metapage(mp); return (rc); } /* set the results of the allocation and write the iag. */ diInitInode(ip, iagno, ino, extno, iagp); write_metapage(mp); return (0); } /* * NAME: diAllocExt(imap,agno,ip) * * FUNCTION: add a new extent of free inodes to an iag, allocating * an inode from this extent to satisfy the current allocation * request. * * this routine first tries to find an existing iag with free * extents through the ag free extent list. if list is not * empty, the head of the list will be selected as the home * of the new extent of free inodes. otherwise (the list is * empty), a new iag will be allocated for the ag to contain * the extent. * * once an iag has been selected, the free extent summary map * is used to locate a free extent within the iag and diNewExt() * is called to initialize the extent, with initialization * including the allocation of the first inode of the extent * for the purpose of satisfying this request. * * PARAMETERS: * imap - pointer to inode map control structure. * agno - allocation group number. * ip - pointer to new inode to be filled in on successful return * with the disk inode number allocated, its extent address * and the start of the ag. * * RETURN VALUES: * 0 - success. * -ENOSPC - insufficient disk resources. * -EIO - i/o error. */ static int diAllocExt(struct inomap * imap, int agno, struct inode *ip) { int rem, iagno, sword, extno, rc; struct metapage *mp; struct iag *iagp; /* check if the ag has any iags with free extents. if not, * allocate a new iag for the ag. */ if ((iagno = imap->im_agctl[agno].extfree) < 0) { /* If successful, diNewIAG will obtain the read lock on the * imap inode. */ if ((rc = diNewIAG(imap, &iagno, agno, &mp))) { return (rc); } iagp = (struct iag *) mp->data; /* set the ag number if this a brand new iag */ iagp->agstart = cpu_to_le64(AGTOBLK(agno, imap->im_ipimap)); } else { /* read the iag. */ IREAD_LOCK(imap->im_ipimap, RDWRLOCK_IMAP); if ((rc = diIAGRead(imap, iagno, &mp))) { IREAD_UNLOCK(imap->im_ipimap); jfs_error(ip->i_sb, "error reading iag\n"); return rc; } iagp = (struct iag *) mp->data; } /* using the free extent summary map, find a free extent. */ for (sword = 0;; sword++) { if (sword >= SMAPSZ) { release_metapage(mp); IREAD_UNLOCK(imap->im_ipimap); jfs_error(ip->i_sb, "free ext summary map not found\n"); return -EIO; } if (~iagp->extsmap[sword]) break; } /* determine the extent number of the free extent. */ rem = diFindFree(le32_to_cpu(iagp->extsmap[sword]), 0); if (rem >= EXTSPERSUM) { release_metapage(mp); IREAD_UNLOCK(imap->im_ipimap); jfs_error(ip->i_sb, "free extent not found\n"); return -EIO; } extno = (sword << L2EXTSPERSUM) + rem; /* initialize the new extent. */ rc = diNewExt(imap, iagp, extno); IREAD_UNLOCK(imap->im_ipimap); if (rc) { /* something bad happened. if a new iag was allocated, * place it back on the inode map's iag free list, and * clear the ag number information. */ if (iagp->nfreeexts == cpu_to_le32(EXTSPERIAG)) { IAGFREE_LOCK(imap); iagp->iagfree = cpu_to_le32(imap->im_freeiag); imap->im_freeiag = iagno; IAGFREE_UNLOCK(imap); } write_metapage(mp); return (rc); } /* set the results of the allocation and write the iag. */ diInitInode(ip, iagno, extno << L2INOSPEREXT, extno, iagp); write_metapage(mp); return (0); } /* * NAME: diAllocBit(imap,iagp,ino) * * FUNCTION: allocate a backed inode from an iag. * * this routine performs the mechanics of allocating a * specified inode from a backed extent. * * if the inode to be allocated represents the last free * inode within the iag, the iag will be removed from the * ag free inode list. * * a careful update approach is used to provide consistency * in the face of updates to multiple buffers. under this * approach, all required buffers are obtained before making * any updates and are held all are updates are complete. * * PRE CONDITION: Already have buffer lock on iagp. Already have AG lock on * this AG. Must have read lock on imap inode. * * PARAMETERS: * imap - pointer to inode map control structure. * iagp - pointer to iag. * ino - inode number to be allocated within the iag. * * RETURN VALUES: * 0 - success. * -ENOSPC - insufficient disk resources. * -EIO - i/o error. */ static int diAllocBit(struct inomap * imap, struct iag * iagp, int ino) { int extno, bitno, agno, sword, rc; struct metapage *amp = NULL, *bmp = NULL; struct iag *aiagp = NULL, *biagp = NULL; u32 mask; /* check if this is the last free inode within the iag. * if so, it will have to be removed from the ag free * inode list, so get the iags preceding and following * it on the list. */ if (iagp->nfreeinos == cpu_to_le32(1)) { if ((int) le32_to_cpu(iagp->inofreefwd) >= 0) { if ((rc = diIAGRead(imap, le32_to_cpu(iagp->inofreefwd), &))) return (rc); aiagp = (struct iag *) amp->data; } if ((int) le32_to_cpu(iagp->inofreeback) >= 0) { if ((rc = diIAGRead(imap, le32_to_cpu(iagp->inofreeback), &bmp))) { if (amp) release_metapage(amp); return (rc); } biagp = (struct iag *) bmp->data; } } /* get the ag number, extent number, inode number within * the extent. */ agno = BLKTOAG(le64_to_cpu(iagp->agstart), JFS_SBI(imap->im_ipimap->i_sb)); extno = ino >> L2INOSPEREXT; bitno = ino & (INOSPEREXT - 1); /* compute the mask for setting the map. */ mask = HIGHORDER >> bitno; /* the inode should be free and backed. */ if (((le32_to_cpu(iagp->pmap[extno]) & mask) != 0) || ((le32_to_cpu(iagp->wmap[extno]) & mask) != 0) || (addressPXD(&iagp->inoext[extno]) == 0)) { if (amp) release_metapage(amp); if (bmp) release_metapage(bmp); jfs_error(imap->im_ipimap->i_sb, "iag inconsistent\n"); return -EIO; } /* mark the inode as allocated in the working map. */ iagp->wmap[extno] |= cpu_to_le32(mask); /* check if all inodes within the extent are now * allocated. if so, update the free inode summary * map to reflect this. */ if (iagp->wmap[extno] == cpu_to_le32(ONES)) { sword = extno >> L2EXTSPERSUM; bitno = extno & (EXTSPERSUM - 1); iagp->inosmap[sword] |= cpu_to_le32(HIGHORDER >> bitno); } /* if this was the last free inode in the iag, remove the * iag from the ag free inode list. */ if (iagp->nfreeinos == cpu_to_le32(1)) { if (amp) { aiagp->inofreeback = iagp->inofreeback; write_metapage(amp); } if (bmp) { biagp->inofreefwd = iagp->inofreefwd; write_metapage(bmp); } else { imap->im_agctl[agno].inofree = le32_to_cpu(iagp->inofreefwd); } iagp->inofreefwd = iagp->inofreeback = cpu_to_le32(-1); } /* update the free inode count at the iag, ag, inode * map levels. */ le32_add_cpu(&iagp->nfreeinos, -1); imap->im_agctl[agno].numfree -= 1; atomic_dec(&imap->im_numfree); return (0); } /* * NAME: diNewExt(imap,iagp,extno) * * FUNCTION: initialize a new extent of inodes for an iag, allocating * the first inode of the extent for use for the current * allocation request. * * disk resources are allocated for the new extent of inodes * and the inodes themselves are initialized to reflect their * existence within the extent (i.e. their inode numbers and * inode extent addresses are set) and their initial state * (mode and link count are set to zero). * * if the iag is new, it is not yet on an ag extent free list * but will now be placed on this list. * * if the allocation of the new extent causes the iag to * have no free extent, the iag will be removed from the * ag extent free list. * * if the iag has no free backed inodes, it will be placed * on the ag free inode list, since the addition of the new * extent will now cause it to have free inodes. * * a careful update approach is used to provide consistency * (i.e. list consistency) in the face of updates to multiple * buffers. under this approach, all required buffers are * obtained before making any updates and are held until all * updates are complete. * * PRE CONDITION: Already have buffer lock on iagp. Already have AG lock on * this AG. Must have read lock on imap inode. * * PARAMETERS: * imap - pointer to inode map control structure. * iagp - pointer to iag. * extno - extent number. * * RETURN VALUES: * 0 - success. * -ENOSPC - insufficient disk resources. * -EIO - i/o error. */ static int diNewExt(struct inomap * imap, struct iag * iagp, int extno) { int agno, iagno, fwd, back, freei = 0, sword, rc; struct iag *aiagp = NULL, *biagp = NULL, *ciagp = NULL; struct metapage *amp, *bmp, *cmp, *dmp; struct inode *ipimap; s64 blkno, hint; int i, j; u32 mask; ino_t ino; struct dinode *dp; struct jfs_sb_info *sbi; /* better have free extents. */ if (!iagp->nfreeexts) { jfs_error(imap->im_ipimap->i_sb, "no free extents\n"); return -EIO; } /* get the inode map inode. */ ipimap = imap->im_ipimap; sbi = JFS_SBI(ipimap->i_sb); amp = bmp = cmp = NULL; /* get the ag and iag numbers for this iag. */ agno = BLKTOAG(le64_to_cpu(iagp->agstart), sbi); iagno = le32_to_cpu(iagp->iagnum); /* check if this is the last free extent within the * iag. if so, the iag must be removed from the ag * free extent list, so get the iags preceding and * following the iag on this list. */ if (iagp->nfreeexts == cpu_to_le32(1)) { if ((fwd = le32_to_cpu(iagp->extfreefwd)) >= 0) { if ((rc = diIAGRead(imap, fwd, &))) return (rc); aiagp = (struct iag *) amp->data; } if ((back = le32_to_cpu(iagp->extfreeback)) >= 0) { if ((rc = diIAGRead(imap, back, &bmp))) goto error_out; biagp = (struct iag *) bmp->data; } } else { /* the iag has free extents. if all extents are free * (as is the case for a newly allocated iag), the iag * must be added to the ag free extent list, so get * the iag at the head of the list in preparation for * adding this iag to this list. */ fwd = back = -1; if (iagp->nfreeexts == cpu_to_le32(EXTSPERIAG)) { if ((fwd = imap->im_agctl[agno].extfree) >= 0) { if ((rc = diIAGRead(imap, fwd, &))) goto error_out; aiagp = (struct iag *) amp->data; } } } /* check if the iag has no free inodes. if so, the iag * will have to be added to the ag free inode list, so get * the iag at the head of the list in preparation for * adding this iag to this list. in doing this, we must * check if we already have the iag at the head of * the list in hand. */ if (iagp->nfreeinos == 0) { freei = imap->im_agctl[agno].inofree; if (freei >= 0) { if (freei == fwd) { ciagp = aiagp; } else if (freei == back) { ciagp = biagp; } else { if ((rc = diIAGRead(imap, freei, &cmp))) goto error_out; ciagp = (struct iag *) cmp->data; } if (ciagp == NULL) { jfs_error(imap->im_ipimap->i_sb, "ciagp == NULL\n"); rc = -EIO; goto error_out; } } } /* allocate disk space for the inode extent. */ if ((extno == 0) || (addressPXD(&iagp->inoext[extno - 1]) == 0)) hint = ((s64) agno << sbi->bmap->db_agl2size) - 1; else hint = addressPXD(&iagp->inoext[extno - 1]) + lengthPXD(&iagp->inoext[extno - 1]) - 1; if ((rc = dbAlloc(ipimap, hint, (s64) imap->im_nbperiext, &blkno))) goto error_out; /* compute the inode number of the first inode within the * extent. */ ino = (iagno << L2INOSPERIAG) + (extno << L2INOSPEREXT); /* initialize the inodes within the newly allocated extent a * page at a time. */ for (i = 0; i < imap->im_nbperiext; i += sbi->nbperpage) { /* get a buffer for this page of disk inodes. */ dmp = get_metapage(ipimap, blkno + i, PSIZE, 1); if (dmp == NULL) { rc = -EIO; goto error_out; } dp = (struct dinode *) dmp->data; /* initialize the inode number, mode, link count and * inode extent address. */ for (j = 0; j < INOSPERPAGE; j++, dp++, ino++) { dp->di_inostamp = cpu_to_le32(sbi->inostamp); dp->di_number = cpu_to_le32(ino); dp->di_fileset = cpu_to_le32(FILESYSTEM_I); dp->di_mode = 0; dp->di_nlink = 0; PXDaddress(&(dp->di_ixpxd), blkno); PXDlength(&(dp->di_ixpxd), imap->im_nbperiext); } write_metapage(dmp); } /* if this is the last free extent within the iag, remove the * iag from the ag free extent list. */ if (iagp->nfreeexts == cpu_to_le32(1)) { if (fwd >= 0) aiagp->extfreeback = iagp->extfreeback; if (back >= 0) biagp->extfreefwd = iagp->extfreefwd; else imap->im_agctl[agno].extfree = le32_to_cpu(iagp->extfreefwd); iagp->extfreefwd = iagp->extfreeback = cpu_to_le32(-1); } else { /* if the iag has all free extents (newly allocated iag), * add the iag to the ag free extent list. */ if (iagp->nfreeexts == cpu_to_le32(EXTSPERIAG)) { if (fwd >= 0) aiagp->extfreeback = cpu_to_le32(iagno); iagp->extfreefwd = cpu_to_le32(fwd); iagp->extfreeback = cpu_to_le32(-1); imap->im_agctl[agno].extfree = iagno; } } /* if the iag has no free inodes, add the iag to the * ag free inode list. */ if (iagp->nfreeinos == 0) { if (freei >= 0) ciagp->inofreeback = cpu_to_le32(iagno); iagp->inofreefwd = cpu_to_le32(imap->im_agctl[agno].inofree); iagp->inofreeback = cpu_to_le32(-1); imap->im_agctl[agno].inofree = iagno; } /* initialize the extent descriptor of the extent. */ PXDlength(&iagp->inoext[extno], imap->im_nbperiext); PXDaddress(&iagp->inoext[extno], blkno); /* initialize the working and persistent map of the extent. * the working map will be initialized such that * it indicates the first inode of the extent is allocated. */ iagp->wmap[extno] = cpu_to_le32(HIGHORDER); iagp->pmap[extno] = 0; /* update the free inode and free extent summary maps * for the extent to indicate the extent has free inodes * and no longer represents a free extent. */ sword = extno >> L2EXTSPERSUM; mask = HIGHORDER >> (extno & (EXTSPERSUM - 1)); iagp->extsmap[sword] |= cpu_to_le32(mask); iagp->inosmap[sword] &= cpu_to_le32(~mask); /* update the free inode and free extent counts for the * iag. */ le32_add_cpu(&iagp->nfreeinos, (INOSPEREXT - 1)); le32_add_cpu(&iagp->nfreeexts, -1); /* update the free and backed inode counts for the ag. */ imap->im_agctl[agno].numfree += (INOSPEREXT - 1); imap->im_agctl[agno].numinos += INOSPEREXT; /* update the free and backed inode counts for the inode map. */ atomic_add(INOSPEREXT - 1, &imap->im_numfree); atomic_add(INOSPEREXT, &imap->im_numinos); /* write the iags. */ if (amp) write_metapage(amp); if (bmp) write_metapage(bmp); if (cmp) write_metapage(cmp); return (0); error_out: /* release the iags. */ if (amp) release_metapage(amp); if (bmp) release_metapage(bmp); if (cmp) release_metapage(cmp); return (rc); } /* * NAME: diNewIAG(imap,iagnop,agno) * * FUNCTION: allocate a new iag for an allocation group. * * first tries to allocate the iag from the inode map * iagfree list: * if the list has free iags, the head of the list is removed * and returned to satisfy the request. * if the inode map's iag free list is empty, the inode map * is extended to hold a new iag. this new iag is initialized * and returned to satisfy the request. * * PARAMETERS: * imap - pointer to inode map control structure. * iagnop - pointer to an iag number set with the number of the * newly allocated iag upon successful return. * agno - allocation group number. * bpp - Buffer pointer to be filled in with new IAG's buffer * * RETURN VALUES: * 0 - success. * -ENOSPC - insufficient disk resources. * -EIO - i/o error. * * serialization: * AG lock held on entry/exit; * write lock on the map is held inside; * read lock on the map is held on successful completion; * * note: new iag transaction: * . synchronously write iag; * . write log of xtree and inode of imap; * . commit; * . synchronous write of xtree (right to left, bottom to top); * . at start of logredo(): init in-memory imap with one additional iag page; * . at end of logredo(): re-read imap inode to determine * new imap size; */ static int diNewIAG(struct inomap * imap, int *iagnop, int agno, struct metapage ** mpp) { int rc; int iagno, i, xlen; struct inode *ipimap; struct super_block *sb; struct jfs_sb_info *sbi; struct metapage *mp; struct iag *iagp; s64 xaddr = 0; s64 blkno; tid_t tid; struct inode *iplist[1]; /* pick up pointers to the inode map and mount inodes */ ipimap = imap->im_ipimap; sb = ipimap->i_sb; sbi = JFS_SBI(sb); /* acquire the free iag lock */ IAGFREE_LOCK(imap); /* if there are any iags on the inode map free iag list, * allocate the iag from the head of the list. */ if (imap->im_freeiag >= 0) { /* pick up the iag number at the head of the list */ iagno = imap->im_freeiag; /* determine the logical block number of the iag */ blkno = IAGTOLBLK(iagno, sbi->l2nbperpage); } else { /* no free iags. the inode map will have to be extented * to include a new iag. */ /* acquire inode map lock */ IWRITE_LOCK(ipimap, RDWRLOCK_IMAP); if (ipimap->i_size >> L2PSIZE != imap->im_nextiag + 1) { IWRITE_UNLOCK(ipimap); IAGFREE_UNLOCK(imap); jfs_error(imap->im_ipimap->i_sb, "ipimap->i_size is wrong\n"); return -EIO; } /* get the next available iag number */ iagno = imap->im_nextiag; /* make sure that we have not exceeded the maximum inode * number limit. */ if (iagno > (MAXIAGS - 1)) { /* release the inode map lock */ IWRITE_UNLOCK(ipimap); rc = -ENOSPC; goto out; } /* * synchronously append new iag page. */ /* determine the logical address of iag page to append */ blkno = IAGTOLBLK(iagno, sbi->l2nbperpage); /* Allocate extent for new iag page */ xlen = sbi->nbperpage; if ((rc = dbAlloc(ipimap, 0, (s64) xlen, &xaddr))) { /* release the inode map lock */ IWRITE_UNLOCK(ipimap); goto out; } /* * start transaction of update of the inode map * addressing structure pointing to the new iag page; */ tid = txBegin(sb, COMMIT_FORCE); mutex_lock(&JFS_IP(ipimap)->commit_mutex); /* update the inode map addressing structure to point to it */ if ((rc = xtInsert(tid, ipimap, 0, blkno, xlen, &xaddr, 0))) { txEnd(tid); mutex_unlock(&JFS_IP(ipimap)->commit_mutex); /* Free the blocks allocated for the iag since it was * not successfully added to the inode map */ dbFree(ipimap, xaddr, (s64) xlen); /* release the inode map lock */ IWRITE_UNLOCK(ipimap); goto out; } /* update the inode map's inode to reflect the extension */ ipimap->i_size += PSIZE; inode_add_bytes(ipimap, PSIZE); /* assign a buffer for the page */ mp = get_metapage(ipimap, blkno, PSIZE, 0); if (!mp) { /* * This is very unlikely since we just created the * extent, but let's try to handle it correctly */ xtTruncate(tid, ipimap, ipimap->i_size - PSIZE, COMMIT_PWMAP); txAbort(tid, 0); txEnd(tid); mutex_unlock(&JFS_IP(ipimap)->commit_mutex); /* release the inode map lock */ IWRITE_UNLOCK(ipimap); rc = -EIO; goto out; } iagp = (struct iag *) mp->data; /* init the iag */ memset(iagp, 0, sizeof(struct iag)); iagp->iagnum = cpu_to_le32(iagno); iagp->inofreefwd = iagp->inofreeback = cpu_to_le32(-1); iagp->extfreefwd = iagp->extfreeback = cpu_to_le32(-1); iagp->iagfree = cpu_to_le32(-1); iagp->nfreeinos = 0; iagp->nfreeexts = cpu_to_le32(EXTSPERIAG); /* initialize the free inode summary map (free extent * summary map initialization handled by bzero). */ for (i = 0; i < SMAPSZ; i++) iagp->inosmap[i] = cpu_to_le32(ONES); /* * Write and sync the metapage */ flush_metapage(mp); /* * txCommit(COMMIT_FORCE) will synchronously write address * index pages and inode after commit in careful update order * of address index pages (right to left, bottom up); */ iplist[0] = ipimap; rc = txCommit(tid, 1, &iplist[0], COMMIT_FORCE); txEnd(tid); mutex_unlock(&JFS_IP(ipimap)->commit_mutex); duplicateIXtree(sb, blkno, xlen, &xaddr); /* update the next available iag number */ imap->im_nextiag += 1; /* Add the iag to the iag free list so we don't lose the iag * if a failure happens now. */ imap->im_freeiag = iagno; /* Until we have logredo working, we want the imap inode & * control page to be up to date. */ diSync(ipimap); /* release the inode map lock */ IWRITE_UNLOCK(ipimap); } /* obtain read lock on map */ IREAD_LOCK(ipimap, RDWRLOCK_IMAP); /* read the iag */ if ((rc = diIAGRead(imap, iagno, &mp))) { IREAD_UNLOCK(ipimap); rc = -EIO; goto out; } iagp = (struct iag *) mp->data; /* remove the iag from the iag free list */ imap->im_freeiag = le32_to_cpu(iagp->iagfree); iagp->iagfree = cpu_to_le32(-1); /* set the return iag number and buffer pointer */ *iagnop = iagno; *mpp = mp; out: /* release the iag free lock */ IAGFREE_UNLOCK(imap); return (rc); } /* * NAME: diIAGRead() * * FUNCTION: get the buffer for the specified iag within a fileset * or aggregate inode map. * * PARAMETERS: * imap - pointer to inode map control structure. * iagno - iag number. * bpp - point to buffer pointer to be filled in on successful * exit. * * SERIALIZATION: * must have read lock on imap inode * (When called by diExtendFS, the filesystem is quiesced, therefore * the read lock is unnecessary.) * * RETURN VALUES: * 0 - success. * -EIO - i/o error. */ static int diIAGRead(struct inomap * imap, int iagno, struct metapage ** mpp) { struct inode *ipimap = imap->im_ipimap; s64 blkno; /* compute the logical block number of the iag. */ blkno = IAGTOLBLK(iagno, JFS_SBI(ipimap->i_sb)->l2nbperpage); /* read the iag. */ *mpp = read_metapage(ipimap, blkno, PSIZE, 0); if (*mpp == NULL) { return -EIO; } return (0); } /* * NAME: diFindFree() * * FUNCTION: find the first free bit in a word starting at * the specified bit position. * * PARAMETERS: * word - word to be examined. * start - starting bit position. * * RETURN VALUES: * bit position of first free bit in the word or 32 if * no free bits were found. */ static int diFindFree(u32 word, int start) { int bitno; assert(start < 32); /* scan the word for the first free bit. */ for (word <<= start, bitno = start; bitno < 32; bitno++, word <<= 1) { if ((word & HIGHORDER) == 0) break; } return (bitno); } /* * NAME: diUpdatePMap() * * FUNCTION: Update the persistent map in an IAG for the allocation or * freeing of the specified inode. * * PRE CONDITIONS: Working map has already been updated for allocate. * * PARAMETERS: * ipimap - Incore inode map inode * inum - Number of inode to mark in permanent map * is_free - If 'true' indicates inode should be marked freed, otherwise * indicates inode should be marked allocated. * * RETURN VALUES: * 0 for success */ int diUpdatePMap(struct inode *ipimap, unsigned long inum, bool is_free, struct tblock * tblk) { int rc; struct iag *iagp; struct metapage *mp; int iagno, ino, extno, bitno; struct inomap *imap; u32 mask; struct jfs_log *log; int lsn, difft, diffp; unsigned long flags; imap = JFS_IP(ipimap)->i_imap; /* get the iag number containing the inode */ iagno = INOTOIAG(inum); /* make sure that the iag is contained within the map */ if (iagno >= imap->im_nextiag) { jfs_error(ipimap->i_sb, "the iag is outside the map\n"); return -EIO; } /* read the iag */ IREAD_LOCK(ipimap, RDWRLOCK_IMAP); rc = diIAGRead(imap, iagno, &mp); IREAD_UNLOCK(ipimap); if (rc) return (rc); metapage_wait_for_io(mp); iagp = (struct iag *) mp->data; /* get the inode number and extent number of the inode within * the iag and the inode number within the extent. */ ino = inum & (INOSPERIAG - 1); extno = ino >> L2INOSPEREXT; bitno = ino & (INOSPEREXT - 1); mask = HIGHORDER >> bitno; /* * mark the inode free in persistent map: */ if (is_free) { /* The inode should have been allocated both in working * map and in persistent map; * the inode will be freed from working map at the release * of last reference release; */ if (!(le32_to_cpu(iagp->wmap[extno]) & mask)) { jfs_error(ipimap->i_sb, "inode %ld not marked as allocated in wmap!\n", inum); } if (!(le32_to_cpu(iagp->pmap[extno]) & mask)) { jfs_error(ipimap->i_sb, "inode %ld not marked as allocated in pmap!\n", inum); } /* update the bitmap for the extent of the freed inode */ iagp->pmap[extno] &= cpu_to_le32(~mask); } /* * mark the inode allocated in persistent map: */ else { /* The inode should be already allocated in the working map * and should be free in persistent map; */ if (!(le32_to_cpu(iagp->wmap[extno]) & mask)) { release_metapage(mp); jfs_error(ipimap->i_sb, "the inode is not allocated in the working map\n"); return -EIO; } if ((le32_to_cpu(iagp->pmap[extno]) & mask) != 0) { release_metapage(mp); jfs_error(ipimap->i_sb, "the inode is not free in the persistent map\n"); return -EIO; } /* update the bitmap for the extent of the allocated inode */ iagp->pmap[extno] |= cpu_to_le32(mask); } /* * update iag lsn */ lsn = tblk->lsn; log = JFS_SBI(tblk->sb)->log; LOGSYNC_LOCK(log, flags); if (mp->lsn != 0) { /* inherit older/smaller lsn */ logdiff(difft, lsn, log); logdiff(diffp, mp->lsn, log); if (difft < diffp) { mp->lsn = lsn; /* move mp after tblock in logsync list */ list_move(&mp->synclist, &tblk->synclist); } /* inherit younger/larger clsn */ assert(mp->clsn); logdiff(difft, tblk->clsn, log); logdiff(diffp, mp->clsn, log); if (difft > diffp) mp->clsn = tblk->clsn; } else { mp->log = log; mp->lsn = lsn; /* insert mp after tblock in logsync list */ log->count++; list_add(&mp->synclist, &tblk->synclist); mp->clsn = tblk->clsn; } LOGSYNC_UNLOCK(log, flags); write_metapage(mp); return (0); } /* * diExtendFS() * * function: update imap for extendfs(); * * note: AG size has been increased s.t. each k old contiguous AGs are * coalesced into a new AG; */ int diExtendFS(struct inode *ipimap, struct inode *ipbmap) { int rc, rcx = 0; struct inomap *imap = JFS_IP(ipimap)->i_imap; struct iag *iagp = NULL, *hiagp = NULL; struct bmap *mp = JFS_SBI(ipbmap->i_sb)->bmap; struct metapage *bp, *hbp; int i, n, head; int numinos, xnuminos = 0, xnumfree = 0; s64 agstart; jfs_info("diExtendFS: nextiag:%d numinos:%d numfree:%d", imap->im_nextiag, atomic_read(&imap->im_numinos), atomic_read(&imap->im_numfree)); /* * reconstruct imap * * coalesce contiguous k (newAGSize/oldAGSize) AGs; * i.e., (AGi, ..., AGj) where i = k*n and j = k*(n+1) - 1 to AGn; * note: new AG size = old AG size * (2**x). */ /* init per AG control information im_agctl[] */ for (i = 0; i < MAXAG; i++) { imap->im_agctl[i].inofree = -1; imap->im_agctl[i].extfree = -1; imap->im_agctl[i].numinos = 0; /* number of backed inodes */ imap->im_agctl[i].numfree = 0; /* number of free backed inodes */ } /* * process each iag page of the map. * * rebuild AG Free Inode List, AG Free Inode Extent List; */ for (i = 0; i < imap->im_nextiag; i++) { if ((rc = diIAGRead(imap, i, &bp))) { rcx = rc; continue; } iagp = (struct iag *) bp->data; if (le32_to_cpu(iagp->iagnum) != i) { release_metapage(bp); jfs_error(ipimap->i_sb, "unexpected value of iagnum\n"); return -EIO; } /* leave free iag in the free iag list */ if (iagp->nfreeexts == cpu_to_le32(EXTSPERIAG)) { release_metapage(bp); continue; } agstart = le64_to_cpu(iagp->agstart); n = agstart >> mp->db_agl2size; iagp->agstart = cpu_to_le64((s64)n << mp->db_agl2size); /* compute backed inodes */ numinos = (EXTSPERIAG - le32_to_cpu(iagp->nfreeexts)) << L2INOSPEREXT; if (numinos > 0) { /* merge AG backed inodes */ imap->im_agctl[n].numinos += numinos; xnuminos += numinos; } /* if any backed free inodes, insert at AG free inode list */ if ((int) le32_to_cpu(iagp->nfreeinos) > 0) { if ((head = imap->im_agctl[n].inofree) == -1) { iagp->inofreefwd = cpu_to_le32(-1); iagp->inofreeback = cpu_to_le32(-1); } else { if ((rc = diIAGRead(imap, head, &hbp))) { rcx = rc; goto nextiag; } hiagp = (struct iag *) hbp->data; hiagp->inofreeback = iagp->iagnum; iagp->inofreefwd = cpu_to_le32(head); iagp->inofreeback = cpu_to_le32(-1); write_metapage(hbp); } imap->im_agctl[n].inofree = le32_to_cpu(iagp->iagnum); /* merge AG backed free inodes */ imap->im_agctl[n].numfree += le32_to_cpu(iagp->nfreeinos); xnumfree += le32_to_cpu(iagp->nfreeinos); } /* if any free extents, insert at AG free extent list */ if (le32_to_cpu(iagp->nfreeexts) > 0) { if ((head = imap->im_agctl[n].extfree) == -1) { iagp->extfreefwd = cpu_to_le32(-1); iagp->extfreeback = cpu_to_le32(-1); } else { if ((rc = diIAGRead(imap, head, &hbp))) { rcx = rc; goto nextiag; } hiagp = (struct iag *) hbp->data; hiagp->extfreeback = iagp->iagnum; iagp->extfreefwd = cpu_to_le32(head); iagp->extfreeback = cpu_to_le32(-1); write_metapage(hbp); } imap->im_agctl[n].extfree = le32_to_cpu(iagp->iagnum); } nextiag: write_metapage(bp); } if (xnuminos != atomic_read(&imap->im_numinos) || xnumfree != atomic_read(&imap->im_numfree)) { jfs_error(ipimap->i_sb, "numinos or numfree incorrect\n"); return -EIO; } return rcx; } /* * duplicateIXtree() * * serialization: IWRITE_LOCK held on entry/exit * * note: shadow page with regular inode (rel.2); */ static void duplicateIXtree(struct super_block *sb, s64 blkno, int xlen, s64 *xaddr) { struct jfs_superblock *j_sb; struct buffer_head *bh; struct inode *ip; tid_t tid; /* if AIT2 ipmap2 is bad, do not try to update it */ if (JFS_SBI(sb)->mntflag & JFS_BAD_SAIT) /* s_flag */ return; ip = diReadSpecial(sb, FILESYSTEM_I, 1); if (ip == NULL) { JFS_SBI(sb)->mntflag |= JFS_BAD_SAIT; if (readSuper(sb, &bh)) return; j_sb = (struct jfs_superblock *)bh->b_data; j_sb->s_flag |= cpu_to_le32(JFS_BAD_SAIT); mark_buffer_dirty(bh); sync_dirty_buffer(bh); brelse(bh); return; } /* start transaction */ tid = txBegin(sb, COMMIT_FORCE); /* update the inode map addressing structure to point to it */ if (xtInsert(tid, ip, 0, blkno, xlen, xaddr, 0)) { JFS_SBI(sb)->mntflag |= JFS_BAD_SAIT; txAbort(tid, 1); goto cleanup; } /* update the inode map's inode to reflect the extension */ ip->i_size += PSIZE; inode_add_bytes(ip, PSIZE); txCommit(tid, 1, &ip, COMMIT_FORCE); cleanup: txEnd(tid); diFreeSpecial(ip); } /* * NAME: copy_from_dinode() * * FUNCTION: Copies inode info from disk inode to in-memory inode * * RETURN VALUES: * 0 - success * -ENOMEM - insufficient memory */ static int copy_from_dinode(struct dinode * dip, struct inode *ip) { struct jfs_inode_info *jfs_ip = JFS_IP(ip); struct jfs_sb_info *sbi = JFS_SBI(ip->i_sb); jfs_ip->fileset = le32_to_cpu(dip->di_fileset); jfs_ip->mode2 = le32_to_cpu(dip->di_mode); jfs_set_inode_flags(ip); ip->i_mode = le32_to_cpu(dip->di_mode) & 0xffff; if (sbi->umask != -1) { ip->i_mode = (ip->i_mode & ~0777) | (0777 & ~sbi->umask); /* For directories, add x permission if r is allowed by umask */ if (S_ISDIR(ip->i_mode)) { if (ip->i_mode & 0400) ip->i_mode |= 0100; if (ip->i_mode & 0040) ip->i_mode |= 0010; if (ip->i_mode & 0004) ip->i_mode |= 0001; } } set_nlink(ip, le32_to_cpu(dip->di_nlink)); jfs_ip->saved_uid = make_kuid(&init_user_ns, le32_to_cpu(dip->di_uid)); if (!uid_valid(sbi->uid)) ip->i_uid = jfs_ip->saved_uid; else { ip->i_uid = sbi->uid; } jfs_ip->saved_gid = make_kgid(&init_user_ns, le32_to_cpu(dip->di_gid)); if (!gid_valid(sbi->gid)) ip->i_gid = jfs_ip->saved_gid; else { ip->i_gid = sbi->gid; } ip->i_size = le64_to_cpu(dip->di_size); ip->i_atime.tv_sec = le32_to_cpu(dip->di_atime.tv_sec); ip->i_atime.tv_nsec = le32_to_cpu(dip->di_atime.tv_nsec); ip->i_mtime.tv_sec = le32_to_cpu(dip->di_mtime.tv_sec); ip->i_mtime.tv_nsec = le32_to_cpu(dip->di_mtime.tv_nsec); ip->i_ctime.tv_sec = le32_to_cpu(dip->di_ctime.tv_sec); ip->i_ctime.tv_nsec = le32_to_cpu(dip->di_ctime.tv_nsec); ip->i_blocks = LBLK2PBLK(ip->i_sb, le64_to_cpu(dip->di_nblocks)); ip->i_generation = le32_to_cpu(dip->di_gen); jfs_ip->ixpxd = dip->di_ixpxd; /* in-memory pxd's are little-endian */ jfs_ip->acl = dip->di_acl; /* as are dxd's */ jfs_ip->ea = dip->di_ea; jfs_ip->next_index = le32_to_cpu(dip->di_next_index); jfs_ip->otime = le32_to_cpu(dip->di_otime.tv_sec); jfs_ip->acltype = le32_to_cpu(dip->di_acltype); if (S_ISCHR(ip->i_mode) || S_ISBLK(ip->i_mode)) { jfs_ip->dev = le32_to_cpu(dip->di_rdev); ip->i_rdev = new_decode_dev(jfs_ip->dev); } if (S_ISDIR(ip->i_mode)) { memcpy(&jfs_ip->i_dirtable, &dip->di_dirtable, 384); } else if (S_ISREG(ip->i_mode) || S_ISLNK(ip->i_mode)) { memcpy(&jfs_ip->i_xtroot, &dip->di_xtroot, 288); } else memcpy(&jfs_ip->i_inline_ea, &dip->di_inlineea, 128); /* Zero the in-memory-only stuff */ jfs_ip->cflag = 0; jfs_ip->btindex = 0; jfs_ip->btorder = 0; jfs_ip->bxflag = 0; jfs_ip->blid = 0; jfs_ip->atlhead = 0; jfs_ip->atltail = 0; jfs_ip->xtlid = 0; return (0); } /* * NAME: copy_to_dinode() * * FUNCTION: Copies inode info from in-memory inode to disk inode */ static void copy_to_dinode(struct dinode * dip, struct inode *ip) { struct jfs_inode_info *jfs_ip = JFS_IP(ip); struct jfs_sb_info *sbi = JFS_SBI(ip->i_sb); dip->di_fileset = cpu_to_le32(jfs_ip->fileset); dip->di_inostamp = cpu_to_le32(sbi->inostamp); dip->di_number = cpu_to_le32(ip->i_ino); dip->di_gen = cpu_to_le32(ip->i_generation); dip->di_size = cpu_to_le64(ip->i_size); dip->di_nblocks = cpu_to_le64(PBLK2LBLK(ip->i_sb, ip->i_blocks)); dip->di_nlink = cpu_to_le32(ip->i_nlink); if (!uid_valid(sbi->uid)) dip->di_uid = cpu_to_le32(i_uid_read(ip)); else dip->di_uid =cpu_to_le32(from_kuid(&init_user_ns, jfs_ip->saved_uid)); if (!gid_valid(sbi->gid)) dip->di_gid = cpu_to_le32(i_gid_read(ip)); else dip->di_gid = cpu_to_le32(from_kgid(&init_user_ns, jfs_ip->saved_gid)); /* * mode2 is only needed for storing the higher order bits. * Trust i_mode for the lower order ones */ if (sbi->umask == -1) dip->di_mode = cpu_to_le32((jfs_ip->mode2 & 0xffff0000) | ip->i_mode); else /* Leave the original permissions alone */ dip->di_mode = cpu_to_le32(jfs_ip->mode2); dip->di_atime.tv_sec = cpu_to_le32(ip->i_atime.tv_sec); dip->di_atime.tv_nsec = cpu_to_le32(ip->i_atime.tv_nsec); dip->di_ctime.tv_sec = cpu_to_le32(ip->i_ctime.tv_sec); dip->di_ctime.tv_nsec = cpu_to_le32(ip->i_ctime.tv_nsec); dip->di_mtime.tv_sec = cpu_to_le32(ip->i_mtime.tv_sec); dip->di_mtime.tv_nsec = cpu_to_le32(ip->i_mtime.tv_nsec); dip->di_ixpxd = jfs_ip->ixpxd; /* in-memory pxd's are little-endian */ dip->di_acl = jfs_ip->acl; /* as are dxd's */ dip->di_ea = jfs_ip->ea; dip->di_next_index = cpu_to_le32(jfs_ip->next_index); dip->di_otime.tv_sec = cpu_to_le32(jfs_ip->otime); dip->di_otime.tv_nsec = 0; dip->di_acltype = cpu_to_le32(jfs_ip->acltype); if (S_ISCHR(ip->i_mode) || S_ISBLK(ip->i_mode)) dip->di_rdev = cpu_to_le32(jfs_ip->dev); }
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