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authorJeff Layton <jlayton@redhat.com>2013-07-30 17:38:44 +0200
committerSteve French <smfrench@gmail.com>2013-07-31 20:45:02 +0200
commit66ffd113f5d81e951b0379acfd0a1df0771d8828 (patch)
tree0256de4f8e9b68b8d3db0309db37e0aa2232792c /fs/cifs
parentcifs: fix bad error handling in crypto code (diff)
downloadlinux-66ffd113f5d81e951b0379acfd0a1df0771d8828.tar.xz
linux-66ffd113f5d81e951b0379acfd0a1df0771d8828.zip
cifs: set sb->s_d_op before calling d_make_root()
Currently, the s_root dentry doesn't get its d_op pointer set to anything. This breaks lookups in the root of case-insensitive mounts since that relies on having d_hash and d_compare routines that know to treat the filename as case-insensitive. cifs.ko has been broken this way for a long time, but commit 1c929cfe6 ("switch cifs"), added a cryptic comment which is removed in the patch below, which makes me wonder if this was done deliberately for some reason. It's not clear to me why we'd want the s_root not to have d_op set properly. It may have something to do with d_automount or d_revalidate on the root, but my suspicion in looking over the code is that Al was just trying to preserve the existing behavior when changing this code over to use s_d_op. This patch changes it so that we set s_d_op before calling d_make_root and removes the comment. I tested mounting, accessing and unmounting several types of shares (including DFS referrals) and everything still seemed to work OK afterward. I could be missing something however, so please do let me know if I am. Reported-by: Jan-Marek Glogowski <glogow@fbihome.de> Cc: Al Viro <viro@ZenIV.linux.org.uk> Cc: Ian Kent <raven@themaw.net> Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <smfrench@gmail.com>
Diffstat (limited to 'fs/cifs')
-rw-r--r--fs/cifs/cifsfs.c11
1 files changed, 5 insertions, 6 deletions
diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
index 4bdd547dbf6f..85ea98d139fc 100644
--- a/fs/cifs/cifsfs.c
+++ b/fs/cifs/cifsfs.c
@@ -147,18 +147,17 @@ cifs_read_super(struct super_block *sb)
goto out_no_root;
}
+ if (cifs_sb_master_tcon(cifs_sb)->nocase)
+ sb->s_d_op = &cifs_ci_dentry_ops;
+ else
+ sb->s_d_op = &cifs_dentry_ops;
+
sb->s_root = d_make_root(inode);
if (!sb->s_root) {
rc = -ENOMEM;
goto out_no_root;
}
- /* do that *after* d_make_root() - we want NULL ->d_op for root here */
- if (cifs_sb_master_tcon(cifs_sb)->nocase)
- sb->s_d_op = &cifs_ci_dentry_ops;
- else
- sb->s_d_op = &cifs_dentry_ops;
-
#ifdef CONFIG_CIFS_NFSD_EXPORT
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
cifs_dbg(FYI, "export ops supported\n");