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| author | Eric W. Biederman <ebiederm@aristanetworks.com> | 2010-05-18 12:58:33 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-05-21 09:37:31 -0700 |
| commit | 68d75ed4b84a0806ecd4bc14da4759713b23a532 (patch) | |
| tree | 025c85987d1d553ed014903ad8f6395250b44fa8 /fs/sysfs | |
| parent | 27eabc7cb4b357c68e4ce77d0b014f7a23add752 (diff) | |
| download | linux-68d75ed4b84a0806ecd4bc14da4759713b23a532.tar.bz2 | |
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>
Diffstat (limited to 'fs/sysfs')
| -rw-r--r-- | fs/sysfs/mount.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/fs/sysfs/mount.c b/fs/sysfs/mount.c index 1afa32ba242c..281c0c9bc39f 100644 --- a/fs/sysfs/mount.c +++ b/fs/sysfs/mount.c @@ -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; |