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authorAl Viro <viro@zeniv.linux.org.uk>2011-11-17 01:22:46 -0500
committerAl Viro <viro@zeniv.linux.org.uk>2012-01-08 19:33:23 -0500
commitaea52e19dd2085617dd7d247afb76a90cf2ea40c (patch)
treed1416b60797f2a5f0c0f67062bcaaee6b227683a /fs/btrfs
parent98c7089c769048f941bd5c5285287f8fc301f8b1 (diff)
downloadop-kernel-dev-aea52e19dd2085617dd7d247afb76a90cf2ea40c.zip
op-kernel-dev-aea52e19dd2085617dd7d247afb76a90cf2ea40c.tar.gz
btrfs: get ->kill_sb() of its own
... and move free_fs_info() to that, out of ->put_super(). Do NOT set ->s_fs_info to NULL in the latter; we need it for sget() to be able to see and wait for fs in the middle of umount if we get a mount/umount race. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/btrfs')
-rw-r--r--fs/btrfs/super.c27
1 files changed, 18 insertions, 9 deletions
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index a3f435e..eca4862 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -147,14 +147,13 @@ void __btrfs_std_error(struct btrfs_fs_info *fs_info, const char *function,
static void btrfs_put_super(struct super_block *sb)
{
- struct btrfs_root *root = btrfs_sb(sb);
- int ret;
-
- ret = close_ctree(root);
- free_fs_info(root->fs_info);
- sb->s_fs_info = NULL;
-
- (void)ret; /* FIXME: need to fix VFS to return error? */
+ (void)close_ctree(btrfs_sb(sb));
+ /* FIXME: need to fix VFS to return error? */
+ /* AV: return it _where_? ->put_super() can be triggered by any number
+ * of async events, up to and including delivery of SIGKILL to the
+ * last process that kept it busy. Or segfault in the aforementioned
+ * process... Whom would you report that to?
+ */
}
enum {
@@ -1223,11 +1222,21 @@ static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf)
return 0;
}
+static void btrfs_kill_super(struct super_block *sb)
+{
+ struct btrfs_fs_info *fs_info = NULL;
+ if (sb->s_root)
+ fs_info = btrfs_sb(sb)->fs_info;
+ kill_anon_super(sb);
+ if (fs_info)
+ free_fs_info(fs_info);
+}
+
static struct file_system_type btrfs_fs_type = {
.owner = THIS_MODULE,
.name = "btrfs",
.mount = btrfs_mount,
- .kill_sb = kill_anon_super,
+ .kill_sb = btrfs_kill_super,
.fs_flags = FS_REQUIRES_DEV,
};
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