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authorBryan Donlan <bdonlan@gmail.com>2009-02-22 21:20:25 -0500
committerTheodore Ts'o <tytso@mit.edu>2009-02-22 21:20:25 -0500
commite6f009b0b45220c004672d41a58865e94946104d (patch)
tree99a00ca6486c896b90376238c22a90de3e31cc57 /fs/ext4/namei.c
parenta4912123b688e057084e6557cef8924f7ae5bbde (diff)
downloadlinux-e6f009b0b45220c004672d41a58865e94946104d.tar.bz2
ext4: return -EIO not -ESTALE on directory traversal through deleted inode
ext4_iget() returns -ESTALE if invoked on a deleted inode, in order to report errors to NFS properly. However, in ext4_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 ext4_lookup to return -EIO if it receives -ESTALE from ext4_iget(), as ext4 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: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'fs/ext4/namei.c')
-rw-r--r--fs/ext4/namei.c12
1 files changed, 10 insertions, 2 deletions
diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index a5ba1a858094..6e1ad68cdc7a 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -1077,8 +1077,16 @@ static struct dentry *ext4_lookup(struct inode *dir, struct dentry *dentry, stru
return ERR_PTR(-EIO);
}
inode = ext4_iget(dir->i_sb, ino);
- if (IS_ERR(inode))
- return ERR_CAST(inode);
+ if (unlikely(IS_ERR(inode))) {
+ if (PTR_ERR(inode) == -ESTALE) {
+ ext4_error(dir->i_sb, __func__,
+ "deleted inode referenced: %u",
+ ino);
+ return ERR_PTR(-EIO);
+ } else {
+ return ERR_CAST(inode);
+ }
+ }
}
return d_splice_alias(inode, dentry);
}