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DEFINITIONS
This source file includes following definitions.
- jfs_mount
- jfs_mount_rw
- chkSuper
- updateSuper
- readSuper
- logMOUNT
/*
* 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
*/
/*
* Module: jfs_mount.c
*
* note: file system in transition to aggregate/fileset:
*
* file system mount is interpreted as the mount of aggregate,
* if not already mounted, and mount of the single/only fileset in
* the aggregate;
*
* a file system/aggregate is represented by an internal inode
* (aka mount inode) initialized with aggregate superblock;
* each vfs represents a fileset, and points to its "fileset inode
* allocation map inode" (aka fileset inode):
* (an aggregate itself is structured recursively as a filset:
* an internal vfs is constructed and points to its "fileset inode
* allocation map inode" (aka aggregate inode) where each inode
* represents a fileset inode) so that inode number is mapped to
* on-disk inode in uniform way at both aggregate and fileset level;
*
* each vnode/inode of a fileset is linked to its vfs (to facilitate
* per fileset inode operations, e.g., unmount of a fileset, etc.);
* each inode points to the mount inode (to facilitate access to
* per aggregate information, e.g., block size, etc.) as well as
* its file set inode.
*
* aggregate
* ipmnt
* mntvfs -> fileset ipimap+ -> aggregate ipbmap -> aggregate ipaimap;
* fileset vfs -> vp(1) <-> ... <-> vp(n) <->vproot;
*/
#include <linux/fs.h>
#include <linux/buffer_head.h>
#include "jfs_incore.h"
#include "jfs_filsys.h"
#include "jfs_superblock.h"
#include "jfs_dmap.h"
#include "jfs_imap.h"
#include "jfs_metapage.h"
#include "jfs_debug.h"
/*
* forward references
*/
static int chkSuper(struct super_block *);
static int logMOUNT(struct super_block *sb);
/*
* NAME: jfs_mount(sb)
*
* FUNCTION: vfs_mount()
*
* PARAMETER: sb - super block
*
* RETURN: -EBUSY - device already mounted or open for write
* -EBUSY - cvrdvp already mounted;
* -EBUSY - mount table full
* -ENOTDIR- cvrdvp not directory on a device mount
* -ENXIO - device open failure
*/
int jfs_mount(struct super_block *sb)
{
int rc = 0; /* Return code */
struct jfs_sb_info *sbi = JFS_SBI(sb);
struct inode *ipaimap = NULL;
struct inode *ipaimap2 = NULL;
struct inode *ipimap = NULL;
struct inode *ipbmap = NULL;
/*
* read/validate superblock
* (initialize mount inode from the superblock)
*/
if ((rc = chkSuper(sb))) {
goto errout20;
}
ipaimap = diReadSpecial(sb, AGGREGATE_I, 0);
if (ipaimap == NULL) {
jfs_err("jfs_mount: Faild to read AGGREGATE_I");
rc = -EIO;
goto errout20;
}
sbi->ipaimap = ipaimap;
jfs_info("jfs_mount: ipaimap:0x%p", ipaimap);
/*
* initialize aggregate inode allocation map
*/
if ((rc = diMount(ipaimap))) {
jfs_err("jfs_mount: diMount(ipaimap) failed w/rc = %d", rc);
goto errout21;
}
/*
* open aggregate block allocation map
*/
ipbmap = diReadSpecial(sb, BMAP_I, 0);
if (ipbmap == NULL) {
rc = -EIO;
goto errout22;
}
jfs_info("jfs_mount: ipbmap:0x%p", ipbmap);
sbi->ipbmap = ipbmap;
/*
* initialize aggregate block allocation map
*/
if ((rc = dbMount(ipbmap))) {
jfs_err("jfs_mount: dbMount failed w/rc = %d", rc);
goto errout22;
}
/*
* open the secondary aggregate inode allocation map
*
* This is a duplicate of the aggregate inode allocation map.
*
* hand craft a vfs in the same fashion as we did to read ipaimap.
* By adding INOSPEREXT (32) to the inode number, we are telling
* diReadSpecial that we are reading from the secondary aggregate
* inode table. This also creates a unique entry in the inode hash
* table.
*/
if ((sbi->mntflag & JFS_BAD_SAIT) == 0) {
ipaimap2 = diReadSpecial(sb, AGGREGATE_I, 1);
if (!ipaimap2) {
jfs_err("jfs_mount: Faild to read AGGREGATE_I");
rc = -EIO;
goto errout35;
}
sbi->ipaimap2 = ipaimap2;
jfs_info("jfs_mount: ipaimap2:0x%p", ipaimap2);
/*
* initialize secondary aggregate inode allocation map
*/
if ((rc = diMount(ipaimap2))) {
jfs_err("jfs_mount: diMount(ipaimap2) failed, rc = %d",
rc);
goto errout35;
}
} else
/* Secondary aggregate inode table is not valid */
sbi->ipaimap2 = NULL;
/*
* mount (the only/single) fileset
*/
/*
* open fileset inode allocation map (aka fileset inode)
*/
ipimap = diReadSpecial(sb, FILESYSTEM_I, 0);
if (ipimap == NULL) {
jfs_err("jfs_mount: Failed to read FILESYSTEM_I");
/* open fileset secondary inode allocation map */
rc = -EIO;
goto errout40;
}
jfs_info("jfs_mount: ipimap:0x%p", ipimap);
/* map further access of per fileset inodes by the fileset inode */
sbi->ipimap = ipimap;
/* initialize fileset inode allocation map */
if ((rc = diMount(ipimap))) {
jfs_err("jfs_mount: diMount failed w/rc = %d", rc);
goto errout41;
}
goto out;
/*
* unwind on error
*/
errout41: /* close fileset inode allocation map inode */
diFreeSpecial(ipimap);
errout40: /* fileset closed */
/* close secondary aggregate inode allocation map */
if (ipaimap2) {
diUnmount(ipaimap2, 1);
diFreeSpecial(ipaimap2);
}
errout35:
/* close aggregate block allocation map */
dbUnmount(ipbmap, 1);
diFreeSpecial(ipbmap);
errout22: /* close aggregate inode allocation map */
diUnmount(ipaimap, 1);
errout21: /* close aggregate inodes */
diFreeSpecial(ipaimap);
errout20: /* aggregate closed */
out:
if (rc)
jfs_err("Mount JFS Failure: %d", rc);
return rc;
}
/*
* NAME: jfs_mount_rw(sb, remount)
*
* FUNCTION: Completes read-write mount, or remounts read-only volume
* as read-write
*/
int jfs_mount_rw(struct super_block *sb, int remount)
{
struct jfs_sb_info *sbi = JFS_SBI(sb);
int rc;
/*
* If we are re-mounting a previously read-only volume, we want to
* re-read the inode and block maps, since fsck.jfs may have updated
* them.
*/
if (remount) {
if (chkSuper(sb) || (sbi->state != FM_CLEAN))
return -EINVAL;
truncate_inode_pages(sbi->ipimap->i_mapping, 0);
truncate_inode_pages(sbi->ipbmap->i_mapping, 0);
diUnmount(sbi->ipimap, 1);
if ((rc = diMount(sbi->ipimap))) {
jfs_err("jfs_mount_rw: diMount failed!");
return rc;
}
dbUnmount(sbi->ipbmap, 1);
if ((rc = dbMount(sbi->ipbmap))) {
jfs_err("jfs_mount_rw: dbMount failed!");
return rc;
}
}
/*
* open/initialize log
*/
if ((rc = lmLogOpen(sb)))
return rc;
/*
* update file system superblock;
*/
if ((rc = updateSuper(sb, FM_MOUNT))) {
jfs_err("jfs_mount: updateSuper failed w/rc = %d", rc);
lmLogClose(sb);
return rc;
}
/*
* write MOUNT log record of the file system
*/
logMOUNT(sb);
return rc;
}
/*
* chkSuper()
*
* validate the superblock of the file system to be mounted and
* get the file system parameters.
*
* returns
* 0 with fragsize set if check successful
* error code if not successful
*/
static int chkSuper(struct super_block *sb)
{
int rc = 0;
struct jfs_sb_info *sbi = JFS_SBI(sb);
struct jfs_superblock *j_sb;
struct buffer_head *bh;
int AIM_bytesize, AIT_bytesize;
int expected_AIM_bytesize, expected_AIT_bytesize;
s64 AIM_byte_addr, AIT_byte_addr, fsckwsp_addr;
s64 byte_addr_diff0, byte_addr_diff1;
s32 bsize;
if ((rc = readSuper(sb, &bh)))
return rc;
j_sb = (struct jfs_superblock *)bh->b_data;
/*
* validate superblock
*/
/* validate fs signature */
if (strncmp(j_sb->s_magic, JFS_MAGIC, 4) ||
le32_to_cpu(j_sb->s_version) > JFS_VERSION) {
rc = -EINVAL;
goto out;
}
bsize = le32_to_cpu(j_sb->s_bsize);
#ifdef _JFS_4K
if (bsize != PSIZE) {
jfs_err("Currently only 4K block size supported!");
rc = -EINVAL;
goto out;
}
#endif /* _JFS_4K */
jfs_info("superblock: flag:0x%08x state:0x%08x size:0x%Lx",
le32_to_cpu(j_sb->s_flag), le32_to_cpu(j_sb->s_state),
(unsigned long long) le64_to_cpu(j_sb->s_size));
/* validate the descriptors for Secondary AIM and AIT */
if ((j_sb->s_flag & cpu_to_le32(JFS_BAD_SAIT)) !=
cpu_to_le32(JFS_BAD_SAIT)) {
expected_AIM_bytesize = 2 * PSIZE;
AIM_bytesize = lengthPXD(&(j_sb->s_aim2)) * bsize;
expected_AIT_bytesize = 4 * PSIZE;
AIT_bytesize = lengthPXD(&(j_sb->s_ait2)) * bsize;
AIM_byte_addr = addressPXD(&(j_sb->s_aim2)) * bsize;
AIT_byte_addr = addressPXD(&(j_sb->s_ait2)) * bsize;
byte_addr_diff0 = AIT_byte_addr - AIM_byte_addr;
fsckwsp_addr = addressPXD(&(j_sb->s_fsckpxd)) * bsize;
byte_addr_diff1 = fsckwsp_addr - AIT_byte_addr;
if ((AIM_bytesize != expected_AIM_bytesize) ||
(AIT_bytesize != expected_AIT_bytesize) ||
(byte_addr_diff0 != AIM_bytesize) ||
(byte_addr_diff1 <= AIT_bytesize))
j_sb->s_flag |= cpu_to_le32(JFS_BAD_SAIT);
}
if ((j_sb->s_flag & cpu_to_le32(JFS_GROUPCOMMIT)) !=
cpu_to_le32(JFS_GROUPCOMMIT))
j_sb->s_flag |= cpu_to_le32(JFS_GROUPCOMMIT);
/* validate fs state */
if (j_sb->s_state != cpu_to_le32(FM_CLEAN) &&
!(sb->s_flags & MS_RDONLY)) {
jfs_err("jfs_mount: Mount Failure: File System Dirty.");
rc = -EINVAL;
goto out;
}
sbi->state = le32_to_cpu(j_sb->s_state);
sbi->mntflag = le32_to_cpu(j_sb->s_flag);
/*
* JFS always does I/O by 4K pages. Don't tell the buffer cache
* that we use anything else (leave s_blocksize alone).
*/
sbi->bsize = bsize;
sbi->l2bsize = le16_to_cpu(j_sb->s_l2bsize);
/*
* For now, ignore s_pbsize, l2bfactor. All I/O going through buffer
* cache.
*/
sbi->nbperpage = PSIZE >> sbi->l2bsize;
sbi->l2nbperpage = L2PSIZE - sbi->l2bsize;
sbi->l2niperblk = sbi->l2bsize - L2DISIZE;
if (sbi->mntflag & JFS_INLINELOG)
sbi->logpxd = j_sb->s_logpxd;
else {
sbi->logdev = new_decode_dev(le32_to_cpu(j_sb->s_logdev));
memcpy(sbi->uuid, j_sb->s_uuid, sizeof(sbi->uuid));
memcpy(sbi->loguuid, j_sb->s_loguuid, sizeof(sbi->uuid));
}
sbi->fsckpxd = j_sb->s_fsckpxd;
sbi->ait2 = j_sb->s_ait2;
out:
brelse(bh);
return rc;
}
/*
* updateSuper()
*
* update synchronously superblock if it is mounted read-write.
*/
int updateSuper(struct super_block *sb, uint state)
{
struct jfs_superblock *j_sb;
struct jfs_sb_info *sbi = JFS_SBI(sb);
struct buffer_head *bh;
int rc;
if (sbi->flag & JFS_NOINTEGRITY) {
if (state == FM_DIRTY) {
sbi->p_state = state;
return 0;
} else if (state == FM_MOUNT) {
sbi->p_state = sbi->state;
state = FM_DIRTY;
} else if (state == FM_CLEAN) {
state = sbi->p_state;
} else
jfs_err("updateSuper: bad state");
} else if (sbi->state == FM_DIRTY)
return 0;
if ((rc = readSuper(sb, &bh)))
return rc;
j_sb = (struct jfs_superblock *)bh->b_data;
j_sb->s_state = cpu_to_le32(state);
sbi->state = state;
if (state == FM_MOUNT) {
/* record log's dev_t and mount serial number */
j_sb->s_logdev = cpu_to_le32(new_encode_dev(sbi->log->bdev->bd_dev));
j_sb->s_logserial = cpu_to_le32(sbi->log->serial);
} else if (state == FM_CLEAN) {
/*
* If this volume is shared with OS/2, OS/2 will need to
* recalculate DASD usage, since we don't deal with it.
*/
if (j_sb->s_flag & cpu_to_le32(JFS_DASD_ENABLED))
j_sb->s_flag |= cpu_to_le32(JFS_DASD_PRIME);
}
mark_buffer_dirty(bh);
sync_dirty_buffer(bh);
brelse(bh);
return 0;
}
/*
* readSuper()
*
* read superblock by raw sector address
*/
int readSuper(struct super_block *sb, struct buffer_head **bpp)
{
/* read in primary superblock */
*bpp = sb_bread(sb, SUPER1_OFF >> sb->s_blocksize_bits);
if (*bpp)
return 0;
/* read in secondary/replicated superblock */
*bpp = sb_bread(sb, SUPER2_OFF >> sb->s_blocksize_bits);
if (*bpp)
return 0;
return -EIO;
}
/*
* logMOUNT()
*
* function: write a MOUNT log record for file system.
*
* MOUNT record keeps logredo() from processing log records
* for this file system past this point in log.
* it is harmless if mount fails.
*
* note: MOUNT record is at aggregate level, not at fileset level,
* since log records of previous mounts of a fileset
* (e.g., AFTER record of extent allocation) have to be processed
* to update block allocation map at aggregate level.
*/
static int logMOUNT(struct super_block *sb)
{
struct jfs_log *log = JFS_SBI(sb)->log;
struct lrd lrd;
lrd.logtid = 0;
lrd.backchain = 0;
lrd.type = cpu_to_le16(LOG_MOUNT);
lrd.length = 0;
lrd.aggregate = cpu_to_le32(new_encode_dev(sb->s_bdev->bd_dev));
lmLog(log, NULL, &lrd, NULL);
return 0;
}