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fs/jfs/jfs_mount.c
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// SPDX-License-Identifier: GPL-2.0-or-later |
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/* * Copyright (C) International Business Machines Corp., 2000-2004 |
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*/ /* * Module: jfs_mount.c * * note: file system in transition to aggregate/fileset: * |
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* file system mount is interpreted as the mount of aggregate, * if not already mounted, and mount of the single/only fileset in |
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* the aggregate; * * a file system/aggregate is represented by an internal inode * (aka mount inode) initialized with aggregate superblock; |
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* each vfs represents a fileset, and points to its "fileset inode |
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* allocation map inode" (aka fileset inode): |
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* (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 |
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* 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. * |
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* aggregate |
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* ipmnt * mntvfs -> fileset ipimap+ -> aggregate ipbmap -> aggregate ipaimap; * fileset vfs -> vp(1) <-> ... <-> vp(n) <->vproot; */ #include <linux/fs.h> #include <linux/buffer_head.h> |
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#include <linux/blkdev.h> |
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#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) { |
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int rc = 0; /* Return code */ |
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struct jfs_sb_info *sbi = JFS_SBI(sb); struct inode *ipaimap = NULL; struct inode *ipaimap2 = NULL; struct inode *ipimap = NULL; struct inode *ipbmap = NULL; /* |
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* read/validate superblock |
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* (initialize mount inode from the superblock) */ if ((rc = chkSuper(sb))) { goto errout20; } ipaimap = diReadSpecial(sb, AGGREGATE_I, 0); if (ipaimap == NULL) { |
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jfs_err("jfs_mount: Failed to read AGGREGATE_I"); |
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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); |
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if (!ipaimap2) { |
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jfs_err("jfs_mount: Failed to read AGGREGATE_I"); |
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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; /* |
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* mount (the only/single) fileset |
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*/ /* * 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; /* |
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* unwind on error |
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*/ 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) { |
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struct jfs_sb_info *sbi = JFS_SBI(sb); |
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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); |
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return rc; } /* * chkSuper() * |
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* validate the superblock of the file system to be mounted and |
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* 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) && |
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!sb_rdonly(sb)) { |
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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)); |
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uuid_copy(&sbi->uuid, &j_sb->s_uuid); uuid_copy(&sbi->loguuid, &j_sb->s_loguuid); |
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} 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; |
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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. * |
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* note: MOUNT record is at aggregate level, not at fileset level, |
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* since log records of previous mounts of a fileset |
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* 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; } |