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1046 lines
24 KiB
1046 lines
24 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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* Portions Copyright (C) Christoph Hellwig, 2001-2002 |
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*/ |
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|
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#include <linux/fs.h> |
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#include <linux/module.h> |
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#include <linux/parser.h> |
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#include <linux/completion.h> |
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#include <linux/vfs.h> |
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#include <linux/quotaops.h> |
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#include <linux/mount.h> |
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#include <linux/moduleparam.h> |
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#include <linux/kthread.h> |
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#include <linux/posix_acl.h> |
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#include <linux/buffer_head.h> |
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#include <linux/exportfs.h> |
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#include <linux/crc32.h> |
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#include <linux/slab.h> |
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#include <linux/uaccess.h> |
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#include <linux/seq_file.h> |
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#include <linux/blkdev.h> |
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|
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#include "jfs_incore.h" |
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#include "jfs_filsys.h" |
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#include "jfs_inode.h" |
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#include "jfs_metapage.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_acl.h" |
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#include "jfs_debug.h" |
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#include "jfs_xattr.h" |
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#include "jfs_dinode.h" |
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|
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MODULE_DESCRIPTION("The Journaled Filesystem (JFS)"); |
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MODULE_AUTHOR("Steve Best/Dave Kleikamp/Barry Arndt, IBM"); |
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MODULE_LICENSE("GPL"); |
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|
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static struct kmem_cache *jfs_inode_cachep; |
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|
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static const struct super_operations jfs_super_operations; |
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static const struct export_operations jfs_export_operations; |
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static struct file_system_type jfs_fs_type; |
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|
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#define MAX_COMMIT_THREADS 64 |
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static int commit_threads; |
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module_param(commit_threads, int, 0); |
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MODULE_PARM_DESC(commit_threads, "Number of commit threads"); |
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|
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static struct task_struct *jfsCommitThread[MAX_COMMIT_THREADS]; |
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struct task_struct *jfsIOthread; |
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struct task_struct *jfsSyncThread; |
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|
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#ifdef CONFIG_JFS_DEBUG |
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int jfsloglevel = JFS_LOGLEVEL_WARN; |
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module_param(jfsloglevel, int, 0644); |
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MODULE_PARM_DESC(jfsloglevel, "Specify JFS loglevel (0, 1 or 2)"); |
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#endif |
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|
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static void jfs_handle_error(struct super_block *sb) |
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{ |
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struct jfs_sb_info *sbi = JFS_SBI(sb); |
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|
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if (sb_rdonly(sb)) |
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return; |
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|
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updateSuper(sb, FM_DIRTY); |
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|
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if (sbi->flag & JFS_ERR_PANIC) |
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panic("JFS (device %s): panic forced after error\n", |
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sb->s_id); |
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else if (sbi->flag & JFS_ERR_REMOUNT_RO) { |
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jfs_err("ERROR: (device %s): remounting filesystem as read-only", |
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sb->s_id); |
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sb->s_flags |= SB_RDONLY; |
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} |
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|
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/* nothing is done for continue beyond marking the superblock dirty */ |
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} |
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|
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void jfs_error(struct super_block *sb, const char *fmt, ...) |
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{ |
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struct va_format vaf; |
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va_list args; |
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|
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va_start(args, fmt); |
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|
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vaf.fmt = fmt; |
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vaf.va = &args; |
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|
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pr_err("ERROR: (device %s): %ps: %pV\n", |
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sb->s_id, __builtin_return_address(0), &vaf); |
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|
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va_end(args); |
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|
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jfs_handle_error(sb); |
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} |
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static struct inode *jfs_alloc_inode(struct super_block *sb) |
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{ |
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struct jfs_inode_info *jfs_inode; |
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|
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jfs_inode = alloc_inode_sb(sb, jfs_inode_cachep, GFP_NOFS); |
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if (!jfs_inode) |
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return NULL; |
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#ifdef CONFIG_QUOTA |
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memset(&jfs_inode->i_dquot, 0, sizeof(jfs_inode->i_dquot)); |
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#endif |
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return &jfs_inode->vfs_inode; |
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} |
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|
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static void jfs_free_inode(struct inode *inode) |
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{ |
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kmem_cache_free(jfs_inode_cachep, JFS_IP(inode)); |
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} |
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|
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static int jfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
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{ |
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struct jfs_sb_info *sbi = JFS_SBI(dentry->d_sb); |
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s64 maxinodes; |
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struct inomap *imap = JFS_IP(sbi->ipimap)->i_imap; |
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|
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jfs_info("In jfs_statfs"); |
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buf->f_type = JFS_SUPER_MAGIC; |
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buf->f_bsize = sbi->bsize; |
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buf->f_blocks = sbi->bmap->db_mapsize; |
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buf->f_bfree = sbi->bmap->db_nfree; |
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buf->f_bavail = sbi->bmap->db_nfree; |
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/* |
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* If we really return the number of allocated & free inodes, some |
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* applications will fail because they won't see enough free inodes. |
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* We'll try to calculate some guess as to how many inodes we can |
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* really allocate |
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* |
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* buf->f_files = atomic_read(&imap->im_numinos); |
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* buf->f_ffree = atomic_read(&imap->im_numfree); |
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*/ |
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maxinodes = min((s64) atomic_read(&imap->im_numinos) + |
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((sbi->bmap->db_nfree >> imap->im_l2nbperiext) |
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<< L2INOSPEREXT), (s64) 0xffffffffLL); |
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buf->f_files = maxinodes; |
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buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) - |
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atomic_read(&imap->im_numfree)); |
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buf->f_fsid.val[0] = crc32_le(0, (char *)&sbi->uuid, |
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sizeof(sbi->uuid)/2); |
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buf->f_fsid.val[1] = crc32_le(0, |
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(char *)&sbi->uuid + sizeof(sbi->uuid)/2, |
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sizeof(sbi->uuid)/2); |
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|
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buf->f_namelen = JFS_NAME_MAX; |
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return 0; |
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} |
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|
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#ifdef CONFIG_QUOTA |
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static int jfs_quota_off(struct super_block *sb, int type); |
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static int jfs_quota_on(struct super_block *sb, int type, int format_id, |
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const struct path *path); |
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|
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static void jfs_quota_off_umount(struct super_block *sb) |
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{ |
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int type; |
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|
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for (type = 0; type < MAXQUOTAS; type++) |
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jfs_quota_off(sb, type); |
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} |
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|
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static const struct quotactl_ops jfs_quotactl_ops = { |
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.quota_on = jfs_quota_on, |
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.quota_off = jfs_quota_off, |
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.quota_sync = dquot_quota_sync, |
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.get_state = dquot_get_state, |
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.set_info = dquot_set_dqinfo, |
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.get_dqblk = dquot_get_dqblk, |
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.set_dqblk = dquot_set_dqblk, |
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.get_nextdqblk = dquot_get_next_dqblk, |
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}; |
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#else |
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static inline void jfs_quota_off_umount(struct super_block *sb) |
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{ |
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} |
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#endif |
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|
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static void jfs_put_super(struct super_block *sb) |
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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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jfs_info("In jfs_put_super"); |
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|
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jfs_quota_off_umount(sb); |
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|
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rc = jfs_umount(sb); |
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if (rc) |
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jfs_err("jfs_umount failed with return code %d", rc); |
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|
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unload_nls(sbi->nls_tab); |
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|
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truncate_inode_pages(sbi->direct_inode->i_mapping, 0); |
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iput(sbi->direct_inode); |
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|
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kfree(sbi); |
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} |
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|
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enum { |
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Opt_integrity, Opt_nointegrity, Opt_iocharset, Opt_resize, |
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Opt_resize_nosize, Opt_errors, Opt_ignore, Opt_err, Opt_quota, |
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Opt_usrquota, Opt_grpquota, Opt_uid, Opt_gid, Opt_umask, |
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Opt_discard, Opt_nodiscard, Opt_discard_minblk |
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}; |
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|
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static const match_table_t tokens = { |
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{Opt_integrity, "integrity"}, |
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{Opt_nointegrity, "nointegrity"}, |
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{Opt_iocharset, "iocharset=%s"}, |
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{Opt_resize, "resize=%u"}, |
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{Opt_resize_nosize, "resize"}, |
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{Opt_errors, "errors=%s"}, |
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{Opt_ignore, "noquota"}, |
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{Opt_quota, "quota"}, |
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{Opt_usrquota, "usrquota"}, |
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{Opt_grpquota, "grpquota"}, |
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{Opt_uid, "uid=%u"}, |
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{Opt_gid, "gid=%u"}, |
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{Opt_umask, "umask=%u"}, |
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{Opt_discard, "discard"}, |
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{Opt_nodiscard, "nodiscard"}, |
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{Opt_discard_minblk, "discard=%u"}, |
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{Opt_err, NULL} |
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}; |
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|
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static int parse_options(char *options, struct super_block *sb, s64 *newLVSize, |
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int *flag) |
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{ |
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void *nls_map = (void *)-1; /* -1: no change; NULL: none */ |
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char *p; |
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struct jfs_sb_info *sbi = JFS_SBI(sb); |
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|
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*newLVSize = 0; |
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|
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if (!options) |
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return 1; |
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|
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while ((p = strsep(&options, ",")) != NULL) { |
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substring_t args[MAX_OPT_ARGS]; |
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int token; |
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if (!*p) |
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continue; |
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|
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token = match_token(p, tokens, args); |
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switch (token) { |
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case Opt_integrity: |
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*flag &= ~JFS_NOINTEGRITY; |
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break; |
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case Opt_nointegrity: |
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*flag |= JFS_NOINTEGRITY; |
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break; |
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case Opt_ignore: |
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/* Silently ignore the quota options */ |
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/* Don't do anything ;-) */ |
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break; |
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case Opt_iocharset: |
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if (nls_map && nls_map != (void *) -1) |
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unload_nls(nls_map); |
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if (!strcmp(args[0].from, "none")) |
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nls_map = NULL; |
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else { |
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nls_map = load_nls(args[0].from); |
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if (!nls_map) { |
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pr_err("JFS: charset not found\n"); |
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goto cleanup; |
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} |
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} |
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break; |
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case Opt_resize: |
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{ |
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char *resize = args[0].from; |
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int rc = kstrtoll(resize, 0, newLVSize); |
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|
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if (rc) |
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goto cleanup; |
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break; |
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} |
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case Opt_resize_nosize: |
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{ |
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*newLVSize = sb_bdev_nr_blocks(sb); |
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if (*newLVSize == 0) |
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pr_err("JFS: Cannot determine volume size\n"); |
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break; |
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} |
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case Opt_errors: |
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{ |
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char *errors = args[0].from; |
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if (!errors || !*errors) |
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goto cleanup; |
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if (!strcmp(errors, "continue")) { |
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*flag &= ~JFS_ERR_REMOUNT_RO; |
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*flag &= ~JFS_ERR_PANIC; |
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*flag |= JFS_ERR_CONTINUE; |
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} else if (!strcmp(errors, "remount-ro")) { |
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*flag &= ~JFS_ERR_CONTINUE; |
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*flag &= ~JFS_ERR_PANIC; |
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*flag |= JFS_ERR_REMOUNT_RO; |
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} else if (!strcmp(errors, "panic")) { |
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*flag &= ~JFS_ERR_CONTINUE; |
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*flag &= ~JFS_ERR_REMOUNT_RO; |
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*flag |= JFS_ERR_PANIC; |
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} else { |
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pr_err("JFS: %s is an invalid error handler\n", |
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errors); |
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goto cleanup; |
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} |
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break; |
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} |
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|
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#ifdef CONFIG_QUOTA |
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case Opt_quota: |
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case Opt_usrquota: |
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*flag |= JFS_USRQUOTA; |
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break; |
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case Opt_grpquota: |
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*flag |= JFS_GRPQUOTA; |
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break; |
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#else |
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case Opt_usrquota: |
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case Opt_grpquota: |
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case Opt_quota: |
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pr_err("JFS: quota operations not supported\n"); |
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break; |
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#endif |
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case Opt_uid: |
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{ |
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char *uid = args[0].from; |
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uid_t val; |
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int rc = kstrtouint(uid, 0, &val); |
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|
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if (rc) |
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goto cleanup; |
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sbi->uid = make_kuid(current_user_ns(), val); |
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if (!uid_valid(sbi->uid)) |
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goto cleanup; |
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break; |
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} |
|
|
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case Opt_gid: |
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{ |
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char *gid = args[0].from; |
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gid_t val; |
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int rc = kstrtouint(gid, 0, &val); |
|
|
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if (rc) |
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goto cleanup; |
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sbi->gid = make_kgid(current_user_ns(), val); |
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if (!gid_valid(sbi->gid)) |
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goto cleanup; |
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break; |
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} |
|
|
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case Opt_umask: |
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{ |
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char *umask = args[0].from; |
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int rc = kstrtouint(umask, 8, &sbi->umask); |
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|
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if (rc) |
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goto cleanup; |
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if (sbi->umask & ~0777) { |
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pr_err("JFS: Invalid value of umask\n"); |
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goto cleanup; |
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} |
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break; |
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} |
|
|
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case Opt_discard: |
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/* if set to 1, even copying files will cause |
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* trimming :O |
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* -> user has more control over the online trimming |
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*/ |
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sbi->minblks_trim = 64; |
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if (bdev_max_discard_sectors(sb->s_bdev)) |
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*flag |= JFS_DISCARD; |
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else |
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pr_err("JFS: discard option not supported on device\n"); |
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break; |
|
|
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case Opt_nodiscard: |
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*flag &= ~JFS_DISCARD; |
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break; |
|
|
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case Opt_discard_minblk: |
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{ |
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char *minblks_trim = args[0].from; |
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int rc; |
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if (bdev_max_discard_sectors(sb->s_bdev)) { |
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*flag |= JFS_DISCARD; |
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rc = kstrtouint(minblks_trim, 0, |
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&sbi->minblks_trim); |
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if (rc) |
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goto cleanup; |
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} else |
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pr_err("JFS: discard option not supported on device\n"); |
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break; |
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} |
|
|
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default: |
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printk("jfs: Unrecognized mount option \"%s\" or missing value\n", |
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p); |
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goto cleanup; |
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} |
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} |
|
|
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if (nls_map != (void *) -1) { |
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/* Discard old (if remount) */ |
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unload_nls(sbi->nls_tab); |
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sbi->nls_tab = nls_map; |
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} |
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return 1; |
|
|
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cleanup: |
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if (nls_map && nls_map != (void *) -1) |
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unload_nls(nls_map); |
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return 0; |
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} |
|
|
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static int jfs_remount(struct super_block *sb, int *flags, char *data) |
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{ |
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s64 newLVSize = 0; |
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int rc = 0; |
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int flag = JFS_SBI(sb)->flag; |
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int ret; |
|
|
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sync_filesystem(sb); |
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if (!parse_options(data, sb, &newLVSize, &flag)) |
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return -EINVAL; |
|
|
|
if (newLVSize) { |
|
if (sb_rdonly(sb)) { |
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pr_err("JFS: resize requires volume to be mounted read-write\n"); |
|
return -EROFS; |
|
} |
|
rc = jfs_extendfs(sb, newLVSize, 0); |
|
if (rc) |
|
return rc; |
|
} |
|
|
|
if (sb_rdonly(sb) && !(*flags & SB_RDONLY)) { |
|
/* |
|
* Invalidate any previously read metadata. fsck may have |
|
* changed the on-disk data since we mounted r/o |
|
*/ |
|
truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0); |
|
|
|
JFS_SBI(sb)->flag = flag; |
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ret = jfs_mount_rw(sb, 1); |
|
|
|
/* mark the fs r/w for quota activity */ |
|
sb->s_flags &= ~SB_RDONLY; |
|
|
|
dquot_resume(sb, -1); |
|
return ret; |
|
} |
|
if (!sb_rdonly(sb) && (*flags & SB_RDONLY)) { |
|
rc = dquot_suspend(sb, -1); |
|
if (rc < 0) |
|
return rc; |
|
rc = jfs_umount_rw(sb); |
|
JFS_SBI(sb)->flag = flag; |
|
return rc; |
|
} |
|
if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY)) |
|
if (!sb_rdonly(sb)) { |
|
rc = jfs_umount_rw(sb); |
|
if (rc) |
|
return rc; |
|
|
|
JFS_SBI(sb)->flag = flag; |
|
ret = jfs_mount_rw(sb, 1); |
|
return ret; |
|
} |
|
JFS_SBI(sb)->flag = flag; |
|
|
|
return 0; |
|
} |
|
|
|
static int jfs_fill_super(struct super_block *sb, void *data, int silent) |
|
{ |
|
struct jfs_sb_info *sbi; |
|
struct inode *inode; |
|
int rc; |
|
s64 newLVSize = 0; |
|
int flag, ret = -EINVAL; |
|
|
|
jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags); |
|
|
|
sbi = kzalloc(sizeof(struct jfs_sb_info), GFP_KERNEL); |
|
if (!sbi) |
|
return -ENOMEM; |
|
|
|
sb->s_fs_info = sbi; |
|
sb->s_max_links = JFS_LINK_MAX; |
|
sb->s_time_min = 0; |
|
sb->s_time_max = U32_MAX; |
|
sbi->sb = sb; |
|
sbi->uid = INVALID_UID; |
|
sbi->gid = INVALID_GID; |
|
sbi->umask = -1; |
|
|
|
/* initialize the mount flag and determine the default error handler */ |
|
flag = JFS_ERR_REMOUNT_RO; |
|
|
|
if (!parse_options((char *) data, sb, &newLVSize, &flag)) |
|
goto out_kfree; |
|
sbi->flag = flag; |
|
|
|
#ifdef CONFIG_JFS_POSIX_ACL |
|
sb->s_flags |= SB_POSIXACL; |
|
#endif |
|
|
|
if (newLVSize) { |
|
pr_err("resize option for remount only\n"); |
|
goto out_kfree; |
|
} |
|
|
|
/* |
|
* Initialize blocksize to 4K. |
|
*/ |
|
sb_set_blocksize(sb, PSIZE); |
|
|
|
/* |
|
* Set method vectors. |
|
*/ |
|
sb->s_op = &jfs_super_operations; |
|
sb->s_export_op = &jfs_export_operations; |
|
sb->s_xattr = jfs_xattr_handlers; |
|
#ifdef CONFIG_QUOTA |
|
sb->dq_op = &dquot_operations; |
|
sb->s_qcop = &jfs_quotactl_ops; |
|
sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP; |
|
#endif |
|
|
|
/* |
|
* Initialize direct-mapping inode/address-space |
|
*/ |
|
inode = new_inode(sb); |
|
if (inode == NULL) { |
|
ret = -ENOMEM; |
|
goto out_unload; |
|
} |
|
inode->i_size = bdev_nr_bytes(sb->s_bdev); |
|
inode->i_mapping->a_ops = &jfs_metapage_aops; |
|
inode_fake_hash(inode); |
|
mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS); |
|
|
|
sbi->direct_inode = inode; |
|
|
|
rc = jfs_mount(sb); |
|
if (rc) { |
|
if (!silent) |
|
jfs_err("jfs_mount failed w/return code = %d", rc); |
|
goto out_mount_failed; |
|
} |
|
if (sb_rdonly(sb)) |
|
sbi->log = NULL; |
|
else { |
|
rc = jfs_mount_rw(sb, 0); |
|
if (rc) { |
|
if (!silent) { |
|
jfs_err("jfs_mount_rw failed, return code = %d", |
|
rc); |
|
} |
|
goto out_no_rw; |
|
} |
|
} |
|
|
|
sb->s_magic = JFS_SUPER_MAGIC; |
|
|
|
if (sbi->mntflag & JFS_OS2) |
|
sb->s_d_op = &jfs_ci_dentry_operations; |
|
|
|
inode = jfs_iget(sb, ROOT_I); |
|
if (IS_ERR(inode)) { |
|
ret = PTR_ERR(inode); |
|
goto out_no_rw; |
|
} |
|
sb->s_root = d_make_root(inode); |
|
if (!sb->s_root) |
|
goto out_no_root; |
|
|
|
/* logical blocks are represented by 40 bits in pxd_t, etc. |
|
* and page cache is indexed by long |
|
*/ |
|
sb->s_maxbytes = min(((loff_t)sb->s_blocksize) << 40, MAX_LFS_FILESIZE); |
|
sb->s_time_gran = 1; |
|
return 0; |
|
|
|
out_no_root: |
|
jfs_err("jfs_read_super: get root dentry failed"); |
|
|
|
out_no_rw: |
|
rc = jfs_umount(sb); |
|
if (rc) |
|
jfs_err("jfs_umount failed with return code %d", rc); |
|
out_mount_failed: |
|
filemap_write_and_wait(sbi->direct_inode->i_mapping); |
|
truncate_inode_pages(sbi->direct_inode->i_mapping, 0); |
|
make_bad_inode(sbi->direct_inode); |
|
iput(sbi->direct_inode); |
|
sbi->direct_inode = NULL; |
|
out_unload: |
|
unload_nls(sbi->nls_tab); |
|
out_kfree: |
|
kfree(sbi); |
|
return ret; |
|
} |
|
|
|
static int jfs_freeze(struct super_block *sb) |
|
{ |
|
struct jfs_sb_info *sbi = JFS_SBI(sb); |
|
struct jfs_log *log = sbi->log; |
|
int rc = 0; |
|
|
|
if (!sb_rdonly(sb)) { |
|
txQuiesce(sb); |
|
rc = lmLogShutdown(log); |
|
if (rc) { |
|
jfs_error(sb, "lmLogShutdown failed\n"); |
|
|
|
/* let operations fail rather than hang */ |
|
txResume(sb); |
|
|
|
return rc; |
|
} |
|
rc = updateSuper(sb, FM_CLEAN); |
|
if (rc) { |
|
jfs_err("jfs_freeze: updateSuper failed"); |
|
/* |
|
* Don't fail here. Everything succeeded except |
|
* marking the superblock clean, so there's really |
|
* no harm in leaving it frozen for now. |
|
*/ |
|
} |
|
} |
|
return 0; |
|
} |
|
|
|
static int jfs_unfreeze(struct super_block *sb) |
|
{ |
|
struct jfs_sb_info *sbi = JFS_SBI(sb); |
|
struct jfs_log *log = sbi->log; |
|
int rc = 0; |
|
|
|
if (!sb_rdonly(sb)) { |
|
rc = updateSuper(sb, FM_MOUNT); |
|
if (rc) { |
|
jfs_error(sb, "updateSuper failed\n"); |
|
goto out; |
|
} |
|
rc = lmLogInit(log); |
|
if (rc) |
|
jfs_error(sb, "lmLogInit failed\n"); |
|
out: |
|
txResume(sb); |
|
} |
|
return rc; |
|
} |
|
|
|
static struct dentry *jfs_do_mount(struct file_system_type *fs_type, |
|
int flags, const char *dev_name, void *data) |
|
{ |
|
return mount_bdev(fs_type, flags, dev_name, data, jfs_fill_super); |
|
} |
|
|
|
static int jfs_sync_fs(struct super_block *sb, int wait) |
|
{ |
|
struct jfs_log *log = JFS_SBI(sb)->log; |
|
|
|
/* log == NULL indicates read-only mount */ |
|
if (log) { |
|
/* |
|
* Write quota structures to quota file, sync_blockdev() will |
|
* write them to disk later |
|
*/ |
|
dquot_writeback_dquots(sb, -1); |
|
jfs_flush_journal(log, wait); |
|
jfs_syncpt(log, 0); |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static int jfs_show_options(struct seq_file *seq, struct dentry *root) |
|
{ |
|
struct jfs_sb_info *sbi = JFS_SBI(root->d_sb); |
|
|
|
if (uid_valid(sbi->uid)) |
|
seq_printf(seq, ",uid=%d", from_kuid(&init_user_ns, sbi->uid)); |
|
if (gid_valid(sbi->gid)) |
|
seq_printf(seq, ",gid=%d", from_kgid(&init_user_ns, sbi->gid)); |
|
if (sbi->umask != -1) |
|
seq_printf(seq, ",umask=%03o", sbi->umask); |
|
if (sbi->flag & JFS_NOINTEGRITY) |
|
seq_puts(seq, ",nointegrity"); |
|
if (sbi->flag & JFS_DISCARD) |
|
seq_printf(seq, ",discard=%u", sbi->minblks_trim); |
|
if (sbi->nls_tab) |
|
seq_printf(seq, ",iocharset=%s", sbi->nls_tab->charset); |
|
if (sbi->flag & JFS_ERR_CONTINUE) |
|
seq_printf(seq, ",errors=continue"); |
|
if (sbi->flag & JFS_ERR_PANIC) |
|
seq_printf(seq, ",errors=panic"); |
|
|
|
#ifdef CONFIG_QUOTA |
|
if (sbi->flag & JFS_USRQUOTA) |
|
seq_puts(seq, ",usrquota"); |
|
|
|
if (sbi->flag & JFS_GRPQUOTA) |
|
seq_puts(seq, ",grpquota"); |
|
#endif |
|
|
|
return 0; |
|
} |
|
|
|
#ifdef CONFIG_QUOTA |
|
|
|
/* Read data from quotafile - avoid pagecache and such because we cannot afford |
|
* acquiring the locks... As quota files are never truncated and quota code |
|
* itself serializes the operations (and no one else should touch the files) |
|
* we don't have to be afraid of races */ |
|
static ssize_t jfs_quota_read(struct super_block *sb, int type, char *data, |
|
size_t len, loff_t off) |
|
{ |
|
struct inode *inode = sb_dqopt(sb)->files[type]; |
|
sector_t blk = off >> sb->s_blocksize_bits; |
|
int err = 0; |
|
int offset = off & (sb->s_blocksize - 1); |
|
int tocopy; |
|
size_t toread; |
|
struct buffer_head tmp_bh; |
|
struct buffer_head *bh; |
|
loff_t i_size = i_size_read(inode); |
|
|
|
if (off > i_size) |
|
return 0; |
|
if (off+len > i_size) |
|
len = i_size-off; |
|
toread = len; |
|
while (toread > 0) { |
|
tocopy = sb->s_blocksize - offset < toread ? |
|
sb->s_blocksize - offset : toread; |
|
|
|
tmp_bh.b_state = 0; |
|
tmp_bh.b_size = i_blocksize(inode); |
|
err = jfs_get_block(inode, blk, &tmp_bh, 0); |
|
if (err) |
|
return err; |
|
if (!buffer_mapped(&tmp_bh)) /* A hole? */ |
|
memset(data, 0, tocopy); |
|
else { |
|
bh = sb_bread(sb, tmp_bh.b_blocknr); |
|
if (!bh) |
|
return -EIO; |
|
memcpy(data, bh->b_data+offset, tocopy); |
|
brelse(bh); |
|
} |
|
offset = 0; |
|
toread -= tocopy; |
|
data += tocopy; |
|
blk++; |
|
} |
|
return len; |
|
} |
|
|
|
/* Write to quotafile */ |
|
static ssize_t jfs_quota_write(struct super_block *sb, int type, |
|
const char *data, size_t len, loff_t off) |
|
{ |
|
struct inode *inode = sb_dqopt(sb)->files[type]; |
|
sector_t blk = off >> sb->s_blocksize_bits; |
|
int err = 0; |
|
int offset = off & (sb->s_blocksize - 1); |
|
int tocopy; |
|
size_t towrite = len; |
|
struct buffer_head tmp_bh; |
|
struct buffer_head *bh; |
|
|
|
inode_lock(inode); |
|
while (towrite > 0) { |
|
tocopy = sb->s_blocksize - offset < towrite ? |
|
sb->s_blocksize - offset : towrite; |
|
|
|
tmp_bh.b_state = 0; |
|
tmp_bh.b_size = i_blocksize(inode); |
|
err = jfs_get_block(inode, blk, &tmp_bh, 1); |
|
if (err) |
|
goto out; |
|
if (offset || tocopy != sb->s_blocksize) |
|
bh = sb_bread(sb, tmp_bh.b_blocknr); |
|
else |
|
bh = sb_getblk(sb, tmp_bh.b_blocknr); |
|
if (!bh) { |
|
err = -EIO; |
|
goto out; |
|
} |
|
lock_buffer(bh); |
|
memcpy(bh->b_data+offset, data, tocopy); |
|
flush_dcache_page(bh->b_page); |
|
set_buffer_uptodate(bh); |
|
mark_buffer_dirty(bh); |
|
unlock_buffer(bh); |
|
brelse(bh); |
|
offset = 0; |
|
towrite -= tocopy; |
|
data += tocopy; |
|
blk++; |
|
} |
|
out: |
|
if (len == towrite) { |
|
inode_unlock(inode); |
|
return err; |
|
} |
|
if (inode->i_size < off+len-towrite) |
|
i_size_write(inode, off+len-towrite); |
|
inode->i_mtime = inode->i_ctime = current_time(inode); |
|
mark_inode_dirty(inode); |
|
inode_unlock(inode); |
|
return len - towrite; |
|
} |
|
|
|
static struct dquot **jfs_get_dquots(struct inode *inode) |
|
{ |
|
return JFS_IP(inode)->i_dquot; |
|
} |
|
|
|
static int jfs_quota_on(struct super_block *sb, int type, int format_id, |
|
const struct path *path) |
|
{ |
|
int err; |
|
struct inode *inode; |
|
|
|
err = dquot_quota_on(sb, type, format_id, path); |
|
if (err) |
|
return err; |
|
|
|
inode = d_inode(path->dentry); |
|
inode_lock(inode); |
|
JFS_IP(inode)->mode2 |= JFS_NOATIME_FL | JFS_IMMUTABLE_FL; |
|
inode_set_flags(inode, S_NOATIME | S_IMMUTABLE, |
|
S_NOATIME | S_IMMUTABLE); |
|
inode_unlock(inode); |
|
mark_inode_dirty(inode); |
|
|
|
return 0; |
|
} |
|
|
|
static int jfs_quota_off(struct super_block *sb, int type) |
|
{ |
|
struct inode *inode = sb_dqopt(sb)->files[type]; |
|
int err; |
|
|
|
if (!inode || !igrab(inode)) |
|
goto out; |
|
|
|
err = dquot_quota_off(sb, type); |
|
if (err) |
|
goto out_put; |
|
|
|
inode_lock(inode); |
|
JFS_IP(inode)->mode2 &= ~(JFS_NOATIME_FL | JFS_IMMUTABLE_FL); |
|
inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE); |
|
inode_unlock(inode); |
|
mark_inode_dirty(inode); |
|
out_put: |
|
iput(inode); |
|
return err; |
|
out: |
|
return dquot_quota_off(sb, type); |
|
} |
|
#endif |
|
|
|
static const struct super_operations jfs_super_operations = { |
|
.alloc_inode = jfs_alloc_inode, |
|
.free_inode = jfs_free_inode, |
|
.dirty_inode = jfs_dirty_inode, |
|
.write_inode = jfs_write_inode, |
|
.evict_inode = jfs_evict_inode, |
|
.put_super = jfs_put_super, |
|
.sync_fs = jfs_sync_fs, |
|
.freeze_fs = jfs_freeze, |
|
.unfreeze_fs = jfs_unfreeze, |
|
.statfs = jfs_statfs, |
|
.remount_fs = jfs_remount, |
|
.show_options = jfs_show_options, |
|
#ifdef CONFIG_QUOTA |
|
.quota_read = jfs_quota_read, |
|
.quota_write = jfs_quota_write, |
|
.get_dquots = jfs_get_dquots, |
|
#endif |
|
}; |
|
|
|
static const struct export_operations jfs_export_operations = { |
|
.fh_to_dentry = jfs_fh_to_dentry, |
|
.fh_to_parent = jfs_fh_to_parent, |
|
.get_parent = jfs_get_parent, |
|
}; |
|
|
|
static struct file_system_type jfs_fs_type = { |
|
.owner = THIS_MODULE, |
|
.name = "jfs", |
|
.mount = jfs_do_mount, |
|
.kill_sb = kill_block_super, |
|
.fs_flags = FS_REQUIRES_DEV, |
|
}; |
|
MODULE_ALIAS_FS("jfs"); |
|
|
|
static void init_once(void *foo) |
|
{ |
|
struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo; |
|
|
|
memset(jfs_ip, 0, sizeof(struct jfs_inode_info)); |
|
INIT_LIST_HEAD(&jfs_ip->anon_inode_list); |
|
init_rwsem(&jfs_ip->rdwrlock); |
|
mutex_init(&jfs_ip->commit_mutex); |
|
init_rwsem(&jfs_ip->xattr_sem); |
|
spin_lock_init(&jfs_ip->ag_lock); |
|
jfs_ip->active_ag = -1; |
|
inode_init_once(&jfs_ip->vfs_inode); |
|
} |
|
|
|
static int __init init_jfs_fs(void) |
|
{ |
|
int i; |
|
int rc; |
|
|
|
jfs_inode_cachep = |
|
kmem_cache_create_usercopy("jfs_ip", sizeof(struct jfs_inode_info), |
|
0, SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|SLAB_ACCOUNT, |
|
offsetof(struct jfs_inode_info, i_inline_all), |
|
sizeof_field(struct jfs_inode_info, i_inline_all), |
|
init_once); |
|
if (jfs_inode_cachep == NULL) |
|
return -ENOMEM; |
|
|
|
/* |
|
* Metapage initialization |
|
*/ |
|
rc = metapage_init(); |
|
if (rc) { |
|
jfs_err("metapage_init failed w/rc = %d", rc); |
|
goto free_slab; |
|
} |
|
|
|
/* |
|
* Transaction Manager initialization |
|
*/ |
|
rc = txInit(); |
|
if (rc) { |
|
jfs_err("txInit failed w/rc = %d", rc); |
|
goto free_metapage; |
|
} |
|
|
|
/* |
|
* I/O completion thread (endio) |
|
*/ |
|
jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO"); |
|
if (IS_ERR(jfsIOthread)) { |
|
rc = PTR_ERR(jfsIOthread); |
|
jfs_err("init_jfs_fs: fork failed w/rc = %d", rc); |
|
goto end_txmngr; |
|
} |
|
|
|
if (commit_threads < 1) |
|
commit_threads = num_online_cpus(); |
|
if (commit_threads > MAX_COMMIT_THREADS) |
|
commit_threads = MAX_COMMIT_THREADS; |
|
|
|
for (i = 0; i < commit_threads; i++) { |
|
jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL, |
|
"jfsCommit"); |
|
if (IS_ERR(jfsCommitThread[i])) { |
|
rc = PTR_ERR(jfsCommitThread[i]); |
|
jfs_err("init_jfs_fs: fork failed w/rc = %d", rc); |
|
commit_threads = i; |
|
goto kill_committask; |
|
} |
|
} |
|
|
|
jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync"); |
|
if (IS_ERR(jfsSyncThread)) { |
|
rc = PTR_ERR(jfsSyncThread); |
|
jfs_err("init_jfs_fs: fork failed w/rc = %d", rc); |
|
goto kill_committask; |
|
} |
|
|
|
#ifdef PROC_FS_JFS |
|
jfs_proc_init(); |
|
#endif |
|
|
|
rc = register_filesystem(&jfs_fs_type); |
|
if (!rc) |
|
return 0; |
|
|
|
#ifdef PROC_FS_JFS |
|
jfs_proc_clean(); |
|
#endif |
|
kthread_stop(jfsSyncThread); |
|
kill_committask: |
|
for (i = 0; i < commit_threads; i++) |
|
kthread_stop(jfsCommitThread[i]); |
|
kthread_stop(jfsIOthread); |
|
end_txmngr: |
|
txExit(); |
|
free_metapage: |
|
metapage_exit(); |
|
free_slab: |
|
kmem_cache_destroy(jfs_inode_cachep); |
|
return rc; |
|
} |
|
|
|
static void __exit exit_jfs_fs(void) |
|
{ |
|
int i; |
|
|
|
jfs_info("exit_jfs_fs called"); |
|
|
|
txExit(); |
|
metapage_exit(); |
|
|
|
kthread_stop(jfsIOthread); |
|
for (i = 0; i < commit_threads; i++) |
|
kthread_stop(jfsCommitThread[i]); |
|
kthread_stop(jfsSyncThread); |
|
#ifdef PROC_FS_JFS |
|
jfs_proc_clean(); |
|
#endif |
|
unregister_filesystem(&jfs_fs_type); |
|
|
|
/* |
|
* Make sure all delayed rcu free inodes are flushed before we |
|
* destroy cache. |
|
*/ |
|
rcu_barrier(); |
|
kmem_cache_destroy(jfs_inode_cachep); |
|
} |
|
|
|
module_init(init_jfs_fs) |
|
module_exit(exit_jfs_fs)
|
|
|