From a6c15c2b0fbfd5c0a84f5f0e1e3f20f85d2b8692 Mon Sep 17 00:00:00 2001 From: Vasily Averin Date: Sun, 15 Jul 2007 23:40:46 -0700 Subject: [PATCH] ext3/ext4: orphan list corruption due bad inode After ext3 orphan list check has been added into ext3_destroy_inode() (please see my previous patch) the following situation has been detected: EXT3-fs warning (device sda6): ext3_unlink: Deleting nonexistent file (37901290), 0 Inode 00000101a15b7840: orphan list check failed! 00000773 6f665f00 74616d72 00000573 65725f00 06737270 66000000 616d726f ... Call Trace: [] ext3_destroy_inode+0x79/0x90 [] sys_unlink+0x126/0x1a0 [] error_exit+0x0/0x81 [] system_call+0x7e/0x83 First messages said that unlinked inode has i_nlink=0, then ext3_unlink() adds this inode into orphan list. Second message means that this inode has not been removed from orphan list. Inode dump has showed that i_fop = &bad_file_ops and it can be set in make_bad_inode() only. Then I've found that ext3_read_inode() can call make_bad_inode() without any error/warning messages, for example in the following case: ... if (inode->i_nlink == 0) { if (inode->i_mode == 0 || !(EXT3_SB(inode->i_sb)->s_mount_state & EXT3_ORPHAN_FS)) { /* this inode is deleted */ brelse (bh); goto bad_inode; ... Bad inode can live some time, ext3_unlink can add it to orphan list, but ext3_delete_inode() do not deleted this inode from orphan list. As result we can have orphan list corruption detected in ext3_destroy_inode(). However it is not clear for me how to fix this issue correctly. As far as i see is_bad_inode() is called after iget() in all places excluding ext3_lookup() and ext3_get_parent(). I believe it makes sense to add bad inode check to these functions too and call iput if bad inode detected. Signed-off-by: Vasily Averin Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/ext3/namei.c | 10 ++++++++++ fs/ext4/namei.c | 10 ++++++++++ 2 files changed, 20 insertions(+) diff --git a/fs/ext3/namei.c b/fs/ext3/namei.c index 9bb046df82..1586807b81 100644 --- a/fs/ext3/namei.c +++ b/fs/ext3/namei.c @@ -1019,6 +1019,11 @@ static struct dentry *ext3_lookup(struct inode * dir, struct dentry *dentry, str if (!inode) return ERR_PTR(-EACCES); + + if (is_bad_inode(inode)) { + iput(inode); + return ERR_PTR(-ENOENT); + } } return d_splice_alias(inode, dentry); } @@ -1054,6 +1059,11 @@ struct dentry *ext3_get_parent(struct dentry *child) if (!inode) return ERR_PTR(-EACCES); + if (is_bad_inode(inode)) { + iput(inode); + return ERR_PTR(-ENOENT); + } + parent = d_alloc_anon(inode); if (!parent) { iput(inode); diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c index 2811e5720a..2de339dd75 100644 --- a/fs/ext4/namei.c +++ b/fs/ext4/namei.c @@ -1017,6 +1017,11 @@ static struct dentry *ext4_lookup(struct inode * dir, struct dentry *dentry, str if (!inode) return ERR_PTR(-EACCES); + + if (is_bad_inode(inode)) { + iput(inode); + return ERR_PTR(-ENOENT); + } } return d_splice_alias(inode, dentry); } @@ -1052,6 +1057,11 @@ struct dentry *ext4_get_parent(struct dentry *child) if (!inode) return ERR_PTR(-EACCES); + if (is_bad_inode(inode)) { + iput(inode); + return ERR_PTR(-ENOENT); + } + parent = d_alloc_anon(inode); if (!parent) { iput(inode); -- 2.39.5