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496 lines
12 KiB
496 lines
12 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Copyright (C) International Business Machines Corp., 2000-2004 |
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*/ |
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|
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/* |
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* Module: jfs_mount.c |
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* |
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* note: file system in transition to aggregate/fileset: |
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* |
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* file system mount is interpreted as the mount of aggregate, |
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* if not already mounted, and mount of the single/only fileset in |
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* the aggregate; |
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* |
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* a file system/aggregate is represented by an internal inode |
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* (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: |
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* an internal vfs is constructed and points to its "fileset inode |
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* allocation map inode" (aka aggregate inode) where each inode |
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* 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; |
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* |
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* each vnode/inode of a fileset is linked to its vfs (to facilitate |
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* per fileset inode operations, e.g., unmount of a fileset, etc.); |
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* each inode points to the mount inode (to facilitate access to |
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* per aggregate information, e.g., block size, etc.) as well as |
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* its file set inode. |
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* |
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* aggregate |
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* ipmnt |
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* mntvfs -> fileset ipimap+ -> aggregate ipbmap -> aggregate ipaimap; |
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* fileset vfs -> vp(1) <-> ... <-> vp(n) <->vproot; |
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*/ |
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#include <linux/fs.h> |
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#include <linux/buffer_head.h> |
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#include <linux/blkdev.h> |
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#include <linux/log2.h> |
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#include "jfs_incore.h" |
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#include "jfs_filsys.h" |
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#include "jfs_superblock.h" |
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#include "jfs_dmap.h" |
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#include "jfs_imap.h" |
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#include "jfs_metapage.h" |
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#include "jfs_debug.h" |
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/* |
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* forward references |
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*/ |
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static int chkSuper(struct super_block *); |
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static int logMOUNT(struct super_block *sb); |
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/* |
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* NAME: jfs_mount(sb) |
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* |
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* FUNCTION: vfs_mount() |
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* |
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* PARAMETER: sb - super block |
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* |
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* RETURN: -EBUSY - device already mounted or open for write |
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* -EBUSY - cvrdvp already mounted; |
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* -EBUSY - mount table full |
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* -ENOTDIR- cvrdvp not directory on a device mount |
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* -ENXIO - device open failure |
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*/ |
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int jfs_mount(struct super_block *sb) |
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{ |
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int rc = 0; /* Return code */ |
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struct jfs_sb_info *sbi = JFS_SBI(sb); |
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struct inode *ipaimap = NULL; |
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struct inode *ipaimap2 = NULL; |
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struct inode *ipimap = NULL; |
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struct inode *ipbmap = NULL; |
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/* |
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* read/validate superblock |
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* (initialize mount inode from the superblock) |
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*/ |
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if ((rc = chkSuper(sb))) { |
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goto out; |
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} |
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ipaimap = diReadSpecial(sb, AGGREGATE_I, 0); |
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if (ipaimap == NULL) { |
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jfs_err("jfs_mount: Failed to read AGGREGATE_I"); |
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rc = -EIO; |
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goto out; |
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} |
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sbi->ipaimap = ipaimap; |
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jfs_info("jfs_mount: ipaimap:0x%p", ipaimap); |
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/* |
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* initialize aggregate inode allocation map |
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*/ |
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if ((rc = diMount(ipaimap))) { |
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jfs_err("jfs_mount: diMount(ipaimap) failed w/rc = %d", rc); |
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goto err_ipaimap; |
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} |
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/* |
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* open aggregate block allocation map |
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*/ |
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ipbmap = diReadSpecial(sb, BMAP_I, 0); |
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if (ipbmap == NULL) { |
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rc = -EIO; |
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goto err_umount_ipaimap; |
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} |
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jfs_info("jfs_mount: ipbmap:0x%p", ipbmap); |
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sbi->ipbmap = ipbmap; |
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/* |
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* initialize aggregate block allocation map |
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*/ |
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if ((rc = dbMount(ipbmap))) { |
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jfs_err("jfs_mount: dbMount failed w/rc = %d", rc); |
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goto err_ipbmap; |
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} |
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/* |
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* open the secondary aggregate inode allocation map |
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* |
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* This is a duplicate of the aggregate inode allocation map. |
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* |
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* hand craft a vfs in the same fashion as we did to read ipaimap. |
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* By adding INOSPEREXT (32) to the inode number, we are telling |
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* diReadSpecial that we are reading from the secondary aggregate |
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* inode table. This also creates a unique entry in the inode hash |
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* table. |
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*/ |
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if ((sbi->mntflag & JFS_BAD_SAIT) == 0) { |
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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; |
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goto err_umount_ipbmap; |
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} |
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sbi->ipaimap2 = ipaimap2; |
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jfs_info("jfs_mount: ipaimap2:0x%p", ipaimap2); |
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/* |
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* initialize secondary aggregate inode allocation map |
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*/ |
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if ((rc = diMount(ipaimap2))) { |
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jfs_err("jfs_mount: diMount(ipaimap2) failed, rc = %d", |
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rc); |
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goto err_ipaimap2; |
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} |
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} else |
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/* Secondary aggregate inode table is not valid */ |
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sbi->ipaimap2 = NULL; |
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/* |
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* mount (the only/single) fileset |
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*/ |
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/* |
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* open fileset inode allocation map (aka fileset inode) |
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*/ |
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ipimap = diReadSpecial(sb, FILESYSTEM_I, 0); |
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if (ipimap == NULL) { |
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jfs_err("jfs_mount: Failed to read FILESYSTEM_I"); |
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/* open fileset secondary inode allocation map */ |
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rc = -EIO; |
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goto err_umount_ipaimap2; |
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} |
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jfs_info("jfs_mount: ipimap:0x%p", ipimap); |
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/* map further access of per fileset inodes by the fileset inode */ |
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sbi->ipimap = ipimap; |
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/* initialize fileset inode allocation map */ |
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if ((rc = diMount(ipimap))) { |
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jfs_err("jfs_mount: diMount failed w/rc = %d", rc); |
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goto err_ipimap; |
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} |
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return rc; |
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/* |
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* unwind on error |
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*/ |
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err_ipimap: |
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/* close fileset inode allocation map inode */ |
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diFreeSpecial(ipimap); |
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err_umount_ipaimap2: |
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/* close secondary aggregate inode allocation map */ |
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if (ipaimap2) |
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diUnmount(ipaimap2, 1); |
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err_ipaimap2: |
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/* close aggregate inodes */ |
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if (ipaimap2) |
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diFreeSpecial(ipaimap2); |
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err_umount_ipbmap: /* close aggregate block allocation map */ |
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dbUnmount(ipbmap, 1); |
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err_ipbmap: /* close aggregate inodes */ |
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diFreeSpecial(ipbmap); |
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err_umount_ipaimap: /* close aggregate inode allocation map */ |
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diUnmount(ipaimap, 1); |
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err_ipaimap: /* close aggregate inodes */ |
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diFreeSpecial(ipaimap); |
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out: |
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if (rc) |
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jfs_err("Mount JFS Failure: %d", rc); |
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return rc; |
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} |
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/* |
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* NAME: jfs_mount_rw(sb, remount) |
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* |
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* FUNCTION: Completes read-write mount, or remounts read-only volume |
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* as read-write |
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*/ |
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int jfs_mount_rw(struct super_block *sb, int remount) |
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{ |
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struct jfs_sb_info *sbi = JFS_SBI(sb); |
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int rc; |
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/* |
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* If we are re-mounting a previously read-only volume, we want to |
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* re-read the inode and block maps, since fsck.jfs may have updated |
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* them. |
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*/ |
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if (remount) { |
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if (chkSuper(sb) || (sbi->state != FM_CLEAN)) |
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return -EINVAL; |
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truncate_inode_pages(sbi->ipimap->i_mapping, 0); |
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truncate_inode_pages(sbi->ipbmap->i_mapping, 0); |
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diUnmount(sbi->ipimap, 1); |
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if ((rc = diMount(sbi->ipimap))) { |
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jfs_err("jfs_mount_rw: diMount failed!"); |
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return rc; |
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} |
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dbUnmount(sbi->ipbmap, 1); |
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if ((rc = dbMount(sbi->ipbmap))) { |
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jfs_err("jfs_mount_rw: dbMount failed!"); |
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return rc; |
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} |
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} |
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/* |
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* open/initialize log |
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*/ |
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if ((rc = lmLogOpen(sb))) |
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return rc; |
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/* |
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* update file system superblock; |
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*/ |
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if ((rc = updateSuper(sb, FM_MOUNT))) { |
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jfs_err("jfs_mount: updateSuper failed w/rc = %d", rc); |
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lmLogClose(sb); |
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return rc; |
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} |
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/* |
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* write MOUNT log record of the file system |
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*/ |
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logMOUNT(sb); |
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return rc; |
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} |
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/* |
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* chkSuper() |
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* |
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* validate the superblock of the file system to be mounted and |
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* get the file system parameters. |
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* |
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* returns |
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* 0 with fragsize set if check successful |
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* error code if not successful |
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*/ |
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static int chkSuper(struct super_block *sb) |
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{ |
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int rc = 0; |
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struct jfs_sb_info *sbi = JFS_SBI(sb); |
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struct jfs_superblock *j_sb; |
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struct buffer_head *bh; |
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int AIM_bytesize, AIT_bytesize; |
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int expected_AIM_bytesize, expected_AIT_bytesize; |
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s64 AIM_byte_addr, AIT_byte_addr, fsckwsp_addr; |
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s64 byte_addr_diff0, byte_addr_diff1; |
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s32 bsize; |
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if ((rc = readSuper(sb, &bh))) |
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return rc; |
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j_sb = (struct jfs_superblock *)bh->b_data; |
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/* |
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* validate superblock |
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*/ |
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/* validate fs signature */ |
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if (strncmp(j_sb->s_magic, JFS_MAGIC, 4) || |
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le32_to_cpu(j_sb->s_version) > JFS_VERSION) { |
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rc = -EINVAL; |
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goto out; |
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} |
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bsize = le32_to_cpu(j_sb->s_bsize); |
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if (bsize != PSIZE) { |
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jfs_err("Only 4K block size supported!"); |
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rc = -EINVAL; |
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goto out; |
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} |
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jfs_info("superblock: flag:0x%08x state:0x%08x size:0x%Lx", |
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le32_to_cpu(j_sb->s_flag), le32_to_cpu(j_sb->s_state), |
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(unsigned long long) le64_to_cpu(j_sb->s_size)); |
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/* validate the descriptors for Secondary AIM and AIT */ |
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if ((j_sb->s_flag & cpu_to_le32(JFS_BAD_SAIT)) != |
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cpu_to_le32(JFS_BAD_SAIT)) { |
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expected_AIM_bytesize = 2 * PSIZE; |
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AIM_bytesize = lengthPXD(&(j_sb->s_aim2)) * bsize; |
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expected_AIT_bytesize = 4 * PSIZE; |
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AIT_bytesize = lengthPXD(&(j_sb->s_ait2)) * bsize; |
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AIM_byte_addr = addressPXD(&(j_sb->s_aim2)) * bsize; |
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AIT_byte_addr = addressPXD(&(j_sb->s_ait2)) * bsize; |
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byte_addr_diff0 = AIT_byte_addr - AIM_byte_addr; |
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fsckwsp_addr = addressPXD(&(j_sb->s_fsckpxd)) * bsize; |
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byte_addr_diff1 = fsckwsp_addr - AIT_byte_addr; |
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if ((AIM_bytesize != expected_AIM_bytesize) || |
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(AIT_bytesize != expected_AIT_bytesize) || |
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(byte_addr_diff0 != AIM_bytesize) || |
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(byte_addr_diff1 <= AIT_bytesize)) |
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j_sb->s_flag |= cpu_to_le32(JFS_BAD_SAIT); |
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} |
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if ((j_sb->s_flag & cpu_to_le32(JFS_GROUPCOMMIT)) != |
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cpu_to_le32(JFS_GROUPCOMMIT)) |
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j_sb->s_flag |= cpu_to_le32(JFS_GROUPCOMMIT); |
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/* validate fs state */ |
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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."); |
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rc = -EINVAL; |
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goto out; |
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} |
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sbi->state = le32_to_cpu(j_sb->s_state); |
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sbi->mntflag = le32_to_cpu(j_sb->s_flag); |
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/* |
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* JFS always does I/O by 4K pages. Don't tell the buffer cache |
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* that we use anything else (leave s_blocksize alone). |
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*/ |
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sbi->bsize = bsize; |
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sbi->l2bsize = le16_to_cpu(j_sb->s_l2bsize); |
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/* check some fields for possible corruption */ |
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if (sbi->l2bsize != ilog2((u32)bsize) || |
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j_sb->pad != 0 || |
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le32_to_cpu(j_sb->s_state) > FM_STATE_MAX) { |
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rc = -EINVAL; |
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jfs_err("jfs_mount: Mount Failure: superblock is corrupt!"); |
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goto out; |
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} |
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/* |
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* For now, ignore s_pbsize, l2bfactor. All I/O going through buffer |
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* cache. |
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*/ |
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sbi->nbperpage = PSIZE >> sbi->l2bsize; |
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sbi->l2nbperpage = L2PSIZE - sbi->l2bsize; |
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sbi->l2niperblk = sbi->l2bsize - L2DISIZE; |
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if (sbi->mntflag & JFS_INLINELOG) |
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sbi->logpxd = j_sb->s_logpxd; |
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else { |
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sbi->logdev = new_decode_dev(le32_to_cpu(j_sb->s_logdev)); |
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uuid_copy(&sbi->uuid, &j_sb->s_uuid); |
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uuid_copy(&sbi->loguuid, &j_sb->s_loguuid); |
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} |
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sbi->fsckpxd = j_sb->s_fsckpxd; |
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sbi->ait2 = j_sb->s_ait2; |
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out: |
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brelse(bh); |
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return rc; |
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} |
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/* |
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* updateSuper() |
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* |
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* update synchronously superblock if it is mounted read-write. |
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*/ |
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int updateSuper(struct super_block *sb, uint state) |
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{ |
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struct jfs_superblock *j_sb; |
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struct jfs_sb_info *sbi = JFS_SBI(sb); |
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struct buffer_head *bh; |
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int rc; |
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if (sbi->flag & JFS_NOINTEGRITY) { |
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if (state == FM_DIRTY) { |
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sbi->p_state = state; |
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return 0; |
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} else if (state == FM_MOUNT) { |
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sbi->p_state = sbi->state; |
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state = FM_DIRTY; |
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} else if (state == FM_CLEAN) { |
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state = sbi->p_state; |
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} else |
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jfs_err("updateSuper: bad state"); |
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} else if (sbi->state == FM_DIRTY) |
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return 0; |
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if ((rc = readSuper(sb, &bh))) |
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return rc; |
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j_sb = (struct jfs_superblock *)bh->b_data; |
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j_sb->s_state = cpu_to_le32(state); |
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sbi->state = state; |
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if (state == FM_MOUNT) { |
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/* record log's dev_t and mount serial number */ |
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j_sb->s_logdev = cpu_to_le32(new_encode_dev(sbi->log->bdev->bd_dev)); |
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j_sb->s_logserial = cpu_to_le32(sbi->log->serial); |
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} else if (state == FM_CLEAN) { |
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/* |
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* If this volume is shared with OS/2, OS/2 will need to |
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* recalculate DASD usage, since we don't deal with it. |
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*/ |
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if (j_sb->s_flag & cpu_to_le32(JFS_DASD_ENABLED)) |
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j_sb->s_flag |= cpu_to_le32(JFS_DASD_PRIME); |
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} |
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mark_buffer_dirty(bh); |
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sync_dirty_buffer(bh); |
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brelse(bh); |
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return 0; |
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} |
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/* |
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* readSuper() |
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* |
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* read superblock by raw sector address |
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*/ |
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int readSuper(struct super_block *sb, struct buffer_head **bpp) |
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{ |
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/* read in primary superblock */ |
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*bpp = sb_bread(sb, SUPER1_OFF >> sb->s_blocksize_bits); |
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if (*bpp) |
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return 0; |
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/* read in secondary/replicated superblock */ |
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*bpp = sb_bread(sb, SUPER2_OFF >> sb->s_blocksize_bits); |
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if (*bpp) |
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return 0; |
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return -EIO; |
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} |
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/* |
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* logMOUNT() |
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* |
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* function: write a MOUNT log record for file system. |
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* |
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* MOUNT record keeps logredo() from processing log records |
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* for this file system past this point in log. |
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* it is harmless if mount fails. |
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* |
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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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* (e.g., AFTER record of extent allocation) have to be processed |
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* to update block allocation map at aggregate level. |
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*/ |
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static int logMOUNT(struct super_block *sb) |
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{ |
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struct jfs_log *log = JFS_SBI(sb)->log; |
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struct lrd lrd; |
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lrd.logtid = 0; |
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lrd.backchain = 0; |
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lrd.type = cpu_to_le16(LOG_MOUNT); |
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lrd.length = 0; |
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lrd.aggregate = cpu_to_le32(new_encode_dev(sb->s_bdev->bd_dev)); |
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lmLog(log, NULL, &lrd, NULL); |
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return 0; |
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}
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