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authorBryan Donlan <bdonlan@gmail.com>2009-06-30 11:41:24 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-06-30 18:56:00 -0700
commit4d6c13f87db12ae1ce35ea6a15688ac72419b133 (patch)
tree82af9604a6f22cd1fe720c56a7d8449f2acc03cd /fs/ext2/namei.c
parent341c87bf346f57748230628c5ad6ee69219250e8 (diff)
downloadop-kernel-dev-4d6c13f87db12ae1ce35ea6a15688ac72419b133.zip
op-kernel-dev-4d6c13f87db12ae1ce35ea6a15688ac72419b133.tar.gz
ext2: return -EIO not -ESTALE on directory traversal through deleted inode
ext2_iget() returns -ESTALE if invoked on a deleted inode, in order to report errors to NFS properly. However, in ext[234]_lookup(), this -ESTALE can be propagated to userspace if the filesystem is corrupted such that a directory entry references a deleted inode. This leads to a misleading error message - "Stale NFS file handle" - and confusion on the part of the admin. The bug can be easily reproduced by creating a new filesystem, making a link to an unused inode using debugfs, then mounting and attempting to ls -l said link. This patch thus changes ext2_lookup to return -EIO if it receives -ESTALE from ext2_iget(), as ext2 does for other filesystem metadata corruption; and also invokes the appropriate ext*_error functions when this case is detected. Signed-off-by: Bryan Donlan <bdonlan@gmail.com> Cc: <linux-ext4@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/ext2/namei.c')
-rw-r--r--fs/ext2/namei.c12
1 files changed, 10 insertions, 2 deletions
diff --git a/fs/ext2/namei.c b/fs/ext2/namei.c
index 6524eca..e1dedb0 100644
--- a/fs/ext2/namei.c
+++ b/fs/ext2/namei.c
@@ -66,8 +66,16 @@ static struct dentry *ext2_lookup(struct inode * dir, struct dentry *dentry, str
inode = NULL;
if (ino) {
inode = ext2_iget(dir->i_sb, ino);
- if (IS_ERR(inode))
- return ERR_CAST(inode);
+ if (unlikely(IS_ERR(inode))) {
+ if (PTR_ERR(inode) == -ESTALE) {
+ ext2_error(dir->i_sb, __func__,
+ "deleted inode referenced: %lu",
+ ino);
+ return ERR_PTR(-EIO);
+ } else {
+ return ERR_CAST(inode);
+ }
+ }
}
return d_splice_alias(inode, dentry);
}
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