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sysfs: Remove usage of S_BIAS to avoid merge conflict with the vfs tree 

In Al's latest vfs tree the code is reworked and S_BIAS has been removed.

It turns out that checking to see if a super block is in the
middle of an unmount in sysfs_exit_ns is unnecessary because we
remove the super_block from the s_supers/s_instances list before
struct sysfs_super_info pointed to by sb->s_fs_info is freed.

For now just delete the unnecessary check to see if a superblock is in the
middle of an unmount, it isn't necessary with or without Al's changes
and it just causes a needless conflict.

Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Eric W. Biederman <ebiederm@aristanetworks.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Eric W. Biederman 2010-05-18 12:58:33 -07:00 committed by Greg Kroah-Hartman
parent 27eabc7cb4
commit 68d75ed4b8
1 changed files with 8 additions and 3 deletions
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11
fs/sysfs/mount.c
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@ -138,6 +138,9 @@ static void sysfs_kill_sb(struct super_block *sb)
{
struct sysfs_super_info *info = sysfs_info(sb);
/* Remove the superblock from fs_supers/s_instances
* so we can't find it, before freeing sysfs_super_info.
*/
kill_anon_super(sb);
kfree(info);
}
@ -156,9 +159,11 @@ void sysfs_exit_ns(enum kobj_ns_type type, const void *ns)
spin_lock(&sb_lock);
list_for_each_entry(sb, &sysfs_fs_type.fs_supers, s_instances) {
struct sysfs_super_info *info = sysfs_info(sb);
/* Ignore superblocks that are in the process of unmounting */
if (sb->s_count <= S_BIAS)
continue;
/*
* If we see a superblock on the fs_supers/s_instances
* list the unmount has not completed and sb->s_fs_info
* points to a valid struct sysfs_super_info.
*/
/* Ignore superblocks with the wrong ns */
if (info->ns[type] != ns)
continue;