Slightly updated version (shorter by a couple lines)
On Sat, Mar 31, 2018 at 6:17 PM, Steve French <smfrench@xxxxxxxxx> wrote:
> Some servers return inode number zero for the root (ok for all other
> inodes), if so
> we need to create a non-zero hash instead for it and use that.
>
>
>
> --
> Thanks,
>
> Steve
--
Thanks,
Steve
From 0bfedb011d647bb044826f878c711aee8ddb26b7 Mon Sep 17 00:00:00 2001
From: Steve French <stfrench@xxxxxxxxxxxxx>
Date: Sat, 31 Mar 2018 18:13:38 -0500
Subject: [PATCH] Fix root directory when server returns inode number of zero
Some servers return inode number zero for the root directory, which
causes ls to display incorrect data (missing "." and "..").
If the server returns zero for the inode number of the root directory,
fake an inode number for it.
Signed-off-by: Steve French <smfrench@xxxxxxxxx>
---
fs/cifs/cifsglob.h | 1 +
fs/cifs/inode.c | 33 +++++++++++++++++++++++++++++++++
2 files changed, 34 insertions(+)
diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index 3e3f86841372..2282562e78a1 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -1470,6 +1470,7 @@ struct dfs_info3_param {
#define CIFS_FATTR_NEED_REVAL 0x4
#define CIFS_FATTR_INO_COLLISION 0x8
#define CIFS_FATTR_UNKNOWN_NLINK 0x10
+#define CIFS_FATTR_FAKE_ROOT_INO 0x20
struct cifs_fattr {
u32 cf_flags;
diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c
index c98a852180b1..6718158505ea 100644
--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -707,6 +707,18 @@ cifs_get_file_info(struct file *filp)
return rc;
}
+/* Simple function to return a 64 bit hash of string. Rarely called */
+static __u64 simple_hashstr(const char *str)
+{
+ const __u64 hash_mult = 1125899906842597; /* a big enough prime */
+ __u64 hash = 0;
+
+ while (*str)
+ hash = (hash + (__u64) *str++) * hash_mult;
+
+ return hash;
+}
+
int
cifs_get_inode_info(struct inode **inode, const char *full_path,
FILE_ALL_INFO *data, struct super_block *sb, int xid,
@@ -816,6 +828,14 @@ cifs_get_inode_info(struct inode **inode, const char *full_path,
tmprc);
fattr.cf_uniqueid = iunique(sb, ROOT_I);
cifs_autodisable_serverino(cifs_sb);
+ } else if ((fattr.cf_uniqueid == 0) &&
+ strlen(full_path) == 0) {
+ /* some servers ret bad root ino ie 0 */
+ cifs_dbg(FYI, "Invalid (0) inodenum\n");
+ fattr.cf_flags |=
+ CIFS_FATTR_FAKE_ROOT_INO;
+ fattr.cf_uniqueid =
+ simple_hashstr(tcon->treeName);
}
}
} else
@@ -832,6 +852,16 @@ cifs_get_inode_info(struct inode **inode, const char *full_path,
&fattr.cf_uniqueid, data);
if (tmprc)
fattr.cf_uniqueid = CIFS_I(*inode)->uniqueid;
+ else if ((fattr.cf_uniqueid == 0) &&
+ strlen(full_path) == 0) {
+ /*
+ * Reuse existing root inode num since
+ * inum zero for root causes ls of . and .. to
+ * not be returned
+ */
+ cifs_dbg(FYI, "Srv ret 0 inode num for root\n");
+ fattr.cf_uniqueid = CIFS_I(*inode)->uniqueid;
+ }
} else
fattr.cf_uniqueid = CIFS_I(*inode)->uniqueid;
}
@@ -893,6 +923,9 @@ cifs_get_inode_info(struct inode **inode, const char *full_path,
}
cgii_exit:
+ if ((*inode) && ((*inode)->i_ino == 0))
+ cifs_dbg(FYI, "inode number of zero returned\n");
+
kfree(buf);
cifs_put_tlink(tlink);
return rc;
--
2.14.1
