diff options
Diffstat (limited to 'fs/jfs/jfs_mount.c')
-rw-r--r-- | fs/jfs/jfs_mount.c | 512 |
1 files changed, 512 insertions, 0 deletions
diff --git a/fs/jfs/jfs_mount.c b/fs/jfs/jfs_mount.c new file mode 100644 index 00000000000..c535ffd638e --- /dev/null +++ b/fs/jfs/jfs_mount.c @@ -0,0 +1,512 @@ +/* + * 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 == 0) { + 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); + + /* + * Set page cache allocation policy + */ + mapping_set_gfp_mask(sb->s_bdev->bd_inode->i_mapping, GFP_NOFS); + + 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; +} |