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[PATCH] ReiserFS: Make sure all dentries refs are released before calling kill_block_super()

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Make sure all dentries refs are released before calling kill_block_super()
so that the assumption that generic_shutdown_super() can completely destroy
the dentry tree for there will be no external references holds true.

What was being done in the put_super() superblock op, is now done in the
kill_sb() filesystem op instead, prior to calling kill_block_super().

Changes made in [try #2]:

 (*) reiserfs_kill_sb() now checks that the superblock FS info pointer is set
     before trying to dereference it.

Signed-off-by: David Howells <dhowells@redhat.com>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>
Cc: <reiserfs-dev@namesys.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
David Howells 2006-10-11 01:22:14 -07:00 committed by Linus Torvalds
parent 9e42ef777f
commit edc666e2ff
1 changed files with 20 additions and 11 deletions
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31
fs/reiserfs/super.c
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@ -430,21 +430,30 @@ int remove_save_link(struct inode *inode, int truncate)
return journal_end(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
}
static void reiserfs_kill_sb(struct super_block *s)
{
if (REISERFS_SB(s)) {
if (REISERFS_SB(s)->xattr_root) {
d_invalidate(REISERFS_SB(s)->xattr_root);
dput(REISERFS_SB(s)->xattr_root);
REISERFS_SB(s)->xattr_root = NULL;
}
if (REISERFS_SB(s)->priv_root) {
d_invalidate(REISERFS_SB(s)->priv_root);
dput(REISERFS_SB(s)->priv_root);
REISERFS_SB(s)->priv_root = NULL;
}
}
kill_block_super(s);
}
static void reiserfs_put_super(struct super_block *s)
{
struct reiserfs_transaction_handle th;
th.t_trans_id = 0;
if (REISERFS_SB(s)->xattr_root) {
d_invalidate(REISERFS_SB(s)->xattr_root);
dput(REISERFS_SB(s)->xattr_root);
}
if (REISERFS_SB(s)->priv_root) {
d_invalidate(REISERFS_SB(s)->priv_root);
dput(REISERFS_SB(s)->priv_root);
}
/* change file system state to current state if it was mounted with read-write permissions */
if (!(s->s_flags & MS_RDONLY)) {
if (!journal_begin(&th, s, 10)) {
@ -2156,7 +2165,7 @@ struct file_system_type reiserfs_fs_type = {
.owner = THIS_MODULE,
.name = "reiserfs",
.get_sb = get_super_block,
.kill_sb = kill_block_super,
.kill_sb = reiserfs_kill_sb,
.fs_flags = FS_REQUIRES_DEV,
};