cregit-Linux how code gets into the kernel

Release 4.10 fs/jfs/resize.c

Directory: fs/jfs
/*
 *   Copyright (C) International Business Machines  Corp., 2000-2004
 *
 *   This program is free software;  you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
 *   the GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program;  if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/

#include <linux/fs.h>
#include <linux/buffer_head.h>
#include <linux/quotaops.h>
#include "jfs_incore.h"
#include "jfs_filsys.h"
#include "jfs_metapage.h"
#include "jfs_dinode.h"
#include "jfs_imap.h"
#include "jfs_dmap.h"
#include "jfs_superblock.h"
#include "jfs_txnmgr.h"
#include "jfs_debug.h"


#define BITSPERPAGE	(PSIZE << 3)

#define L2MEGABYTE	20

#define MEGABYTE	(1 << L2MEGABYTE)

#define MEGABYTE32	(MEGABYTE << 5)

/* convert block number to bmap file page number */

#define BLKTODMAPN(b)\
	(((b) >> 13) + ((b) >> 23) + ((b) >> 33) + 3 + 1)

/*
 *      jfs_extendfs()
 *
 * function: extend file system;
 *
 *   |-------------------------------|----------|----------|
 *   file system space               fsck       inline log
 *                                   workspace  space
 *
 * input:
 *      new LVSize: in LV blocks (required)
 *      new LogSize: in LV blocks (optional)
 *      new FSSize: in LV blocks (optional)
 *
 * new configuration:
 * 1. set new LogSize as specified or default from new LVSize;
 * 2. compute new FSCKSize from new LVSize;
 * 3. set new FSSize as MIN(FSSize, LVSize-(LogSize+FSCKSize)) where
 *    assert(new FSSize >= old FSSize),
 *    i.e., file system must not be shrunk;
 */

int jfs_extendfs(struct super_block *sb, s64 newLVSize, int newLogSize) { int rc = 0; struct jfs_sb_info *sbi = JFS_SBI(sb); struct inode *ipbmap = sbi->ipbmap; struct inode *ipbmap2; struct inode *ipimap = sbi->ipimap; struct jfs_log *log = sbi->log; struct bmap *bmp = sbi->bmap; s64 newLogAddress, newFSCKAddress; int newFSCKSize; s64 newMapSize = 0, mapSize; s64 XAddress, XSize, nblocks, xoff, xaddr, t64; s64 oldLVSize; s64 newFSSize; s64 VolumeSize; int newNpages = 0, nPages, newPage, xlen, t32; int tid; int log_formatted = 0; struct inode *iplist[1]; struct jfs_superblock *j_sb, *j_sb2; s64 old_agsize; int agsizechanged = 0; struct buffer_head *bh, *bh2; /* If the volume hasn't grown, get out now */ if (sbi->mntflag & JFS_INLINELOG) oldLVSize = addressPXD(&sbi->logpxd) + lengthPXD(&sbi->logpxd); else oldLVSize = addressPXD(&sbi->fsckpxd) + lengthPXD(&sbi->fsckpxd); if (oldLVSize >= newLVSize) { printk(KERN_WARNING "jfs_extendfs: volume hasn't grown, returning\n"); goto out; } VolumeSize = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits; if (VolumeSize) { if (newLVSize > VolumeSize) { printk(KERN_WARNING "jfs_extendfs: invalid size\n"); rc = -EINVAL; goto out; } } else { /* check the device */ bh = sb_bread(sb, newLVSize - 1); if (!bh) { printk(KERN_WARNING "jfs_extendfs: invalid size\n"); rc = -EINVAL; goto out; } bforget(bh); } /* Can't extend write-protected drive */ if (isReadOnly(ipbmap)) { printk(KERN_WARNING "jfs_extendfs: read-only file system\n"); rc = -EROFS; goto out; } /* * reconfigure LV spaces * --------------------- * * validate new size, or, if not specified, determine new size */ /* * reconfigure inline log space: */ if ((sbi->mntflag & JFS_INLINELOG)) { if (newLogSize == 0) { /* * no size specified: default to 1/256 of aggregate * size; rounded up to a megabyte boundary; */ newLogSize = newLVSize >> 8; t32 = (1 << (20 - sbi->l2bsize)) - 1; newLogSize = (newLogSize + t32) & ~t32; newLogSize = min(newLogSize, MEGABYTE32 >> sbi->l2bsize); } else { /* * convert the newLogSize to fs blocks. * * Since this is given in megabytes, it will always be * an even number of pages. */ newLogSize = (newLogSize * MEGABYTE) >> sbi->l2bsize; } } else newLogSize = 0; newLogAddress = newLVSize - newLogSize; /* * reconfigure fsck work space: * * configure it to the end of the logical volume regardless of * whether file system extends to the end of the aggregate; * Need enough 4k pages to cover: * - 1 bit per block in aggregate rounded up to BPERDMAP boundary * - 1 extra page to handle control page and intermediate level pages * - 50 extra pages for the chkdsk service log */ t64 = ((newLVSize - newLogSize + BPERDMAP - 1) >> L2BPERDMAP) << L2BPERDMAP; t32 = DIV_ROUND_UP(t64, BITSPERPAGE) + 1 + 50; newFSCKSize = t32 << sbi->l2nbperpage; newFSCKAddress = newLogAddress - newFSCKSize; /* * compute new file system space; */ newFSSize = newLVSize - newLogSize - newFSCKSize; /* file system cannot be shrunk */ if (newFSSize < bmp->db_mapsize) { rc = -EINVAL; goto out; } /* * If we're expanding enough that the inline log does not overlap * the old one, we can format the new log before we quiesce the * filesystem. */ if ((sbi->mntflag & JFS_INLINELOG) && (newLogAddress > oldLVSize)) { if ((rc = lmLogFormat(log, newLogAddress, newLogSize))) goto out; log_formatted = 1; } /* * quiesce file system * * (prepare to move the inline log and to prevent map update) * * block any new transactions and wait for completion of * all wip transactions and flush modified pages s.t. * on-disk file system is in consistent state and * log is not required for recovery. */ txQuiesce(sb); /* Reset size of direct inode */ sbi->direct_inode->i_size = sb->s_bdev->bd_inode->i_size; if (sbi->mntflag & JFS_INLINELOG) { /* * deactivate old inline log */ lmLogShutdown(log); /* * mark on-disk super block for fs in transition; * * update on-disk superblock for the new space configuration * of inline log space and fsck work space descriptors: * N.B. FS descriptor is NOT updated; * * crash recovery: * logredo(): if FM_EXTENDFS, return to fsck() for cleanup; * fsck(): if FM_EXTENDFS, reformat inline log and fsck * workspace from superblock inline log descriptor and fsck * workspace descriptor; */ /* read in superblock */ if ((rc = readSuper(sb, &bh))) goto error_out; j_sb = (struct jfs_superblock *)bh->b_data; /* mark extendfs() in progress */ j_sb->s_state |= cpu_to_le32(FM_EXTENDFS); j_sb->s_xsize = cpu_to_le64(newFSSize); PXDaddress(&j_sb->s_xfsckpxd, newFSCKAddress); PXDlength(&j_sb->s_xfsckpxd, newFSCKSize); PXDaddress(&j_sb->s_xlogpxd, newLogAddress); PXDlength(&j_sb->s_xlogpxd, newLogSize); /* synchronously update superblock */ mark_buffer_dirty(bh); sync_dirty_buffer(bh); brelse(bh); /* * format new inline log synchronously; * * crash recovery: if log move in progress, * reformat log and exit success; */ if (!log_formatted) if ((rc = lmLogFormat(log, newLogAddress, newLogSize))) goto error_out; /* * activate new log */ log->base = newLogAddress; log->size = newLogSize >> (L2LOGPSIZE - sb->s_blocksize_bits); if ((rc = lmLogInit(log))) goto error_out; } /* * extend block allocation map * --------------------------- * * extendfs() for new extension, retry after crash recovery; * * note: both logredo() and fsck() rebuild map from * the bitmap and configuration parameter from superblock * (disregarding all other control information in the map); * * superblock: * s_size: aggregate size in physical blocks; */ /* * compute the new block allocation map configuration * * map dinode: * di_size: map file size in byte; * di_nblocks: number of blocks allocated for map file; * di_mapsize: number of blocks in aggregate (covered by map); * map control page: * db_mapsize: number of blocks in aggregate (covered by map); */ newMapSize = newFSSize; /* number of data pages of new bmap file: * roundup new size to full dmap page boundary and * add 1 extra dmap page for next extendfs() */ t64 = (newMapSize - 1) + BPERDMAP; newNpages = BLKTODMAPN(t64) + 1; /* * extend map from current map (WITHOUT growing mapfile) * * map new extension with unmapped part of the last partial * dmap page, if applicable, and extra page(s) allocated * at end of bmap by mkfs() or previous extendfs(); */ extendBmap: /* compute number of blocks requested to extend */ mapSize = bmp->db_mapsize; XAddress = mapSize; /* eXtension Address */ XSize = newMapSize - mapSize; /* eXtension Size */ old_agsize = bmp->db_agsize; /* We need to know if this changes */ /* compute number of blocks that can be extended by current mapfile */ t64 = dbMapFileSizeToMapSize(ipbmap); if (mapSize > t64) { printk(KERN_ERR "jfs_extendfs: mapSize (0x%Lx) > t64 (0x%Lx)\n", (long long) mapSize, (long long) t64); rc = -EIO; goto error_out; } nblocks = min(t64 - mapSize, XSize); /* * update map pages for new extension: * * update/init dmap and bubble up the control hierarchy * incrementally fold up dmaps into upper levels; * update bmap control page; */ if ((rc = dbExtendFS(ipbmap, XAddress, nblocks))) goto error_out; agsizechanged |= (bmp->db_agsize != old_agsize); /* * the map now has extended to cover additional nblocks: * dn_mapsize = oldMapsize + nblocks; */ /* ipbmap->i_mapsize += nblocks; */ XSize -= nblocks; /* * grow map file to cover remaining extension * and/or one extra dmap page for next extendfs(); * * allocate new map pages and its backing blocks, and * update map file xtree */ /* compute number of data pages of current bmap file */ nPages = ipbmap->i_size >> L2PSIZE; /* need to grow map file ? */ if (nPages == newNpages) goto finalizeBmap; /* * grow bmap file for the new map pages required: * * allocate growth at the start of newly extended region; * bmap file only grows sequentially, i.e., both data pages * and possibly xtree index pages may grow in append mode, * s.t. logredo() can reconstruct pre-extension state * by washing away bmap file of pages outside s_size boundary; */ /* * journal map file growth as if a regular file growth: * (note: bmap is created with di_mode = IFJOURNAL|IFREG); * * journaling of bmap file growth is not required since * logredo() do/can not use log records of bmap file growth * but it provides careful write semantics, pmap update, etc.; */ /* synchronous write of data pages: bmap data pages are * cached in meta-data cache, and not written out * by txCommit(); */ rc = filemap_fdatawait(ipbmap->i_mapping); if (rc) goto error_out; rc = filemap_write_and_wait(ipbmap->i_mapping); if (rc) goto error_out; diWriteSpecial(ipbmap, 0); newPage = nPages; /* first new page number */ xoff = newPage << sbi->l2nbperpage; xlen = (newNpages - nPages) << sbi->l2nbperpage; xlen = min(xlen, (int) nblocks) & ~(sbi->nbperpage - 1); xaddr = XAddress; tid = txBegin(sb, COMMIT_FORCE); if ((rc = xtAppend(tid, ipbmap, 0, xoff, nblocks, &xlen, &xaddr, 0))) { txEnd(tid); goto error_out; } /* update bmap file size */ ipbmap->i_size += xlen << sbi->l2bsize; inode_add_bytes(ipbmap, xlen << sbi->l2bsize); iplist[0] = ipbmap; rc = txCommit(tid, 1, &iplist[0], COMMIT_FORCE); txEnd(tid); if (rc) goto error_out; /* * map file has been grown now to cover extension to further out; * di_size = new map file size; * * if huge extension, the previous extension based on previous * map file size may not have been sufficient to cover whole extension * (it could have been used up for new map pages), * but the newly grown map file now covers lot bigger new free space * available for further extension of map; */ /* any more blocks to extend ? */ if (XSize) goto extendBmap; finalizeBmap: /* finalize bmap */ dbFinalizeBmap(ipbmap); /* * update inode allocation map * --------------------------- * * move iag lists from old to new iag; * agstart field is not updated for logredo() to reconstruct * iag lists if system crash occurs. * (computation of ag number from agstart based on agsize * will correctly identify the new ag); */ /* if new AG size the same as old AG size, done! */ if (agsizechanged) { if ((rc = diExtendFS(ipimap, ipbmap))) goto error_out; /* finalize imap */ if ((rc = diSync(ipimap))) goto error_out; } /* * finalize * -------- * * extension is committed when on-disk super block is * updated with new descriptors: logredo will recover * crash before it to pre-extension state; */ /* sync log to skip log replay of bmap file growth transaction; */ /* lmLogSync(log, 1); */ /* * synchronous write bmap global control page; * for crash before completion of write * logredo() will recover to pre-extendfs state; * for crash after completion of write, * logredo() will recover post-extendfs state; */ if ((rc = dbSync(ipbmap))) goto error_out; /* * copy primary bmap inode to secondary bmap inode */ ipbmap2 = diReadSpecial(sb, BMAP_I, 1); if (ipbmap2 == NULL) { printk(KERN_ERR "jfs_extendfs: diReadSpecial(bmap) failed\n"); goto error_out; } memcpy(&JFS_IP(ipbmap2)->i_xtroot, &JFS_IP(ipbmap)->i_xtroot, 288); ipbmap2->i_size = ipbmap->i_size; ipbmap2->i_blocks = ipbmap->i_blocks; diWriteSpecial(ipbmap2, 1); diFreeSpecial(ipbmap2); /* * update superblock */ if ((rc = readSuper(sb, &bh))) goto error_out; j_sb = (struct jfs_superblock *)bh->b_data; /* mark extendfs() completion */ j_sb->s_state &= cpu_to_le32(~FM_EXTENDFS); j_sb->s_size = cpu_to_le64(bmp->db_mapsize << le16_to_cpu(j_sb->s_l2bfactor)); j_sb->s_agsize = cpu_to_le32(bmp->db_agsize); /* update inline log space descriptor */ if (sbi->mntflag & JFS_INLINELOG) { PXDaddress(&(j_sb->s_logpxd), newLogAddress); PXDlength(&(j_sb->s_logpxd), newLogSize); } /* record log's mount serial number */ j_sb->s_logserial = cpu_to_le32(log->serial); /* update fsck work space descriptor */ PXDaddress(&(j_sb->s_fsckpxd), newFSCKAddress); PXDlength(&(j_sb->s_fsckpxd), newFSCKSize); j_sb->s_fscklog = 1; /* sb->s_fsckloglen remains the same */ /* Update secondary superblock */ bh2 = sb_bread(sb, SUPER2_OFF >> sb->s_blocksize_bits); if (bh2) { j_sb2 = (struct jfs_superblock *)bh2->b_data; memcpy(j_sb2, j_sb, sizeof (struct jfs_superblock)); mark_buffer_dirty(bh); sync_dirty_buffer(bh2); brelse(bh2); } /* write primary superblock */ mark_buffer_dirty(bh); sync_dirty_buffer(bh); brelse(bh); goto resume; error_out: jfs_error(sb, "\n"); resume: /* * resume file system transactions */ txResume(sb); out: return rc; }

Contributors

PersonTokensPropCommitsCommitProp
dave kleikampdave kleikamp141293.95%1157.89%
christoph hellwigchristoph hellwig473.13%15.26%
quorum lavalquorum laval181.20%15.26%
bill pembertonbill pemberton161.06%15.26%
shaun zinckshaun zinck40.27%15.26%
andrew mortonandrew morton30.20%15.26%
lucas de marchilucas de marchi10.07%15.26%
joe perchesjoe perches10.07%15.26%
hirofumi ogawahirofumi ogawa10.07%15.26%
Total1503100.00%19100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
dave kleikampdave kleikamp147494.13%1260.00%
christoph hellwigchristoph hellwig473.00%15.00%
quorum lavalquorum laval181.15%15.00%
bill pembertonbill pemberton161.02%15.00%
shaun zinckshaun zinck40.26%15.00%
andrew mortonandrew morton30.19%15.00%
lucas de marchilucas de marchi20.13%15.00%
hirofumi ogawahirofumi ogawa10.06%15.00%
joe perchesjoe perches10.06%15.00%
Total1566100.00%20100.00%
Directory: fs/jfs
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