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| author | Al Viro <viro@zeniv.linux.org.uk> | 2009-05-06 05:48:50 +0200 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2009-06-12 03:36:07 +0200 |
| commit | 443b94baaa16771e98b29ca7c24f1e305738ffca (patch) | |
| tree | cf498a25d012330928e0315222c46ea90c200530 /fs/super.c | |
| parent | enforce ->sync_fs is only called for rw superblock (diff) | |
| download | linux-443b94baaa16771e98b29ca7c24f1e305738ffca.tar.xz linux-443b94baaa16771e98b29ca7c24f1e305738ffca.zip | |
Make sure that all callers of remount hold s_umount exclusive
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to '')
| -rw-r--r-- | fs/super.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/fs/super.c b/fs/super.c index cb19fffc7681..49f670cb9a83 100644 --- a/fs/super.c +++ b/fs/super.c @@ -579,7 +579,7 @@ static void do_emergency_remount(struct work_struct *work) list_for_each_entry(sb, &super_blocks, s_list) { sb->s_count++; spin_unlock(&sb_lock); - down_read(&sb->s_umount); + down_write(&sb->s_umount); if (sb->s_root && sb->s_bdev && !(sb->s_flags & MS_RDONLY)) { /* * ->remount_fs needs lock_kernel(). @@ -590,7 +590,8 @@ static void do_emergency_remount(struct work_struct *work) do_remount_sb(sb, MS_RDONLY, NULL, 1); unlock_kernel(); } - drop_super(sb); + up_write(&sb->s_umount); + put_super(sb); spin_lock(&sb_lock); } spin_unlock(&sb_lock); |