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Push BKL down into do_remount_sb() 

[folded fix from Jiri Slaby]

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2009-05-08 13:36:58 -04:00
parent 7f78d4cd4c
commit 4aa98cf768
2 changed files with 13 additions and 13 deletions
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10
fs/namespace.c
View File

@ -1060,11 +1060,8 @@ static int do_umount(struct vfsmount *mnt, int flags)
* we just try to remount it readonly.
*/
down_write(&sb->s_umount);
if (!(sb->s_flags & MS_RDONLY)) {
lock_kernel();
if (!(sb->s_flags & MS_RDONLY))
retval = do_remount_sb(sb, MS_RDONLY, NULL, 0);
unlock_kernel();
}
up_write(&sb->s_umount);
return retval;
}
@ -1515,11 +1512,8 @@ static int do_remount(struct path *path, int flags, int mnt_flags,
down_write(&sb->s_umount);
if (flags & MS_BIND)
err = change_mount_flags(path->mnt, flags);
else {
lock_kernel();
else
err = do_remount_sb(sb, flags, data, 0);
unlock_kernel();
}
if (!err)
path->mnt->mnt_flags = mnt_flags;
up_write(&sb->s_umount);

16
fs/super.c
View File

@ -542,25 +542,33 @@ int do_remount_sb(struct super_block *sb, int flags, void *data, int force)
shrink_dcache_sb(sb);
sync_filesystem(sb);
lock_kernel();
/* If we are remounting RDONLY and current sb is read/write,
make sure there are no rw files opened */
if ((flags & MS_RDONLY) && !(sb->s_flags & MS_RDONLY)) {
if (force)
mark_files_ro(sb);
else if (!fs_may_remount_ro(sb))
else if (!fs_may_remount_ro(sb)) {
unlock_kernel();
return -EBUSY;
}
retval = vfs_dq_off(sb, 1);
if (retval < 0 && retval != -ENOSYS)
if (retval < 0 && retval != -ENOSYS) {
unlock_kernel();
return -EBUSY;
}
}
remount_rw = !(flags & MS_RDONLY) && (sb->s_flags & MS_RDONLY);
if (sb->s_op->remount_fs) {
retval = sb->s_op->remount_fs(sb, &flags, data);
if (retval)
if (retval) {
unlock_kernel();
return retval;
}
}
sb->s_flags = (sb->s_flags & ~MS_RMT_MASK) | (flags & MS_RMT_MASK);
unlock_kernel();
if (remount_rw)
vfs_dq_quota_on_remount(sb);
return 0;
@ -581,9 +589,7 @@ static void do_emergency_remount(struct work_struct *work)
*
* What lock protects sb->s_flags??
*/
lock_kernel();
do_remount_sb(sb, MS_RDONLY, NULL, 1);
unlock_kernel();
}
up_write(&sb->s_umount);
put_super(sb);