- 根目录:
- fs
- jfs
- resize.c
/*
* 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();
*/
filemap_fdatawait(ipbmap->i_mapping);
filemap_write_and_wait(ipbmap->i_mapping);
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;
}