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authorJim McDonough <jmcd@samba.org>2013-09-21 10:36:10 -0500
committerSteve French <smfrench@gmail.com>2013-09-21 10:36:10 -0500
commit74d290da476f672ad756634d12aa707375d3564d (patch)
treeaa972423ddb39e39d49cca13349eb9e07c3d70c3 /fs
parent9ae6cf606a33b0a762798df0fb742848bcc685b5 (diff)
downloadlinux-74d290da476f672ad756634d12aa707375d3564d.tar.bz2
[CIFS] Provide sane values for nlink
Since we don't get info about the number of links from the readdir linfo levels, stat() will return 0 for st_nlink, and in particular, samba re-exported shares will show directories as files (as samba is keying off st_nlink before evaluating how to set the dos modebits) when doing a dir or ls. Copy nlink to the inode, unless it wasn't provided. Provide sane values if we don't have an existing one and none was provided. Signed-off-by: Jim McDonough <jmcd@samba.org> Reviewed-by: Jeff Layton <jlayton@redhat.com> Reviewed-by: David Disseldorp <ddiss@samba.org> Signed-off-by: Steve French <smfrench@gmail.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/cifs/cifsglob.h1
-rw-r--r--fs/cifs/inode.c45
-rw-r--r--fs/cifs/readdir.c3
3 files changed, 43 insertions, 6 deletions
diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index 9c72be6fb0df..52b6f6c26bfc 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -1268,6 +1268,7 @@ struct dfs_info3_param {
#define CIFS_FATTR_DELETE_PENDING 0x2
#define CIFS_FATTR_NEED_REVAL 0x4
#define CIFS_FATTR_INO_COLLISION 0x8
+#define CIFS_FATTR_UNKNOWN_NLINK 0x10
struct cifs_fattr {
u32 cf_flags;
diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c
index f9ff9c173f78..867b7cdc794a 100644
--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -120,6 +120,33 @@ cifs_revalidate_cache(struct inode *inode, struct cifs_fattr *fattr)
cifs_i->invalid_mapping = true;
}
+/*
+ * copy nlink to the inode, unless it wasn't provided. Provide
+ * sane values if we don't have an existing one and none was provided
+ */
+static void
+cifs_nlink_fattr_to_inode(struct inode *inode, struct cifs_fattr *fattr)
+{
+ /*
+ * if we're in a situation where we can't trust what we
+ * got from the server (readdir, some non-unix cases)
+ * fake reasonable values
+ */
+ if (fattr->cf_flags & CIFS_FATTR_UNKNOWN_NLINK) {
+ /* only provide fake values on a new inode */
+ if (inode->i_state & I_NEW) {
+ if (fattr->cf_cifsattrs & ATTR_DIRECTORY)
+ set_nlink(inode, 2);
+ else
+ set_nlink(inode, 1);
+ }
+ return;
+ }
+
+ /* we trust the server, so update it */
+ set_nlink(inode, fattr->cf_nlink);
+}
+
/* populate an inode with info from a cifs_fattr struct */
void
cifs_fattr_to_inode(struct inode *inode, struct cifs_fattr *fattr)
@@ -134,7 +161,7 @@ cifs_fattr_to_inode(struct inode *inode, struct cifs_fattr *fattr)
inode->i_mtime = fattr->cf_mtime;
inode->i_ctime = fattr->cf_ctime;
inode->i_rdev = fattr->cf_rdev;
- set_nlink(inode, fattr->cf_nlink);
+ cifs_nlink_fattr_to_inode(inode, fattr);
inode->i_uid = fattr->cf_uid;
inode->i_gid = fattr->cf_gid;
@@ -541,6 +568,7 @@ cifs_all_info_to_fattr(struct cifs_fattr *fattr, FILE_ALL_INFO *info,
fattr->cf_bytes = le64_to_cpu(info->AllocationSize);
fattr->cf_createtime = le64_to_cpu(info->CreationTime);
+ fattr->cf_nlink = le32_to_cpu(info->NumberOfLinks);
if (fattr->cf_cifsattrs & ATTR_DIRECTORY) {
fattr->cf_mode = S_IFDIR | cifs_sb->mnt_dir_mode;
fattr->cf_dtype = DT_DIR;
@@ -548,7 +576,8 @@ cifs_all_info_to_fattr(struct cifs_fattr *fattr, FILE_ALL_INFO *info,
* Server can return wrong NumberOfLinks value for directories
* when Unix extensions are disabled - fake it.
*/
- fattr->cf_nlink = 2;
+ if (!tcon->unix_ext)
+ fattr->cf_flags |= CIFS_FATTR_UNKNOWN_NLINK;
} else if (fattr->cf_cifsattrs & ATTR_REPARSE) {
fattr->cf_mode = S_IFLNK;
fattr->cf_dtype = DT_LNK;
@@ -561,11 +590,15 @@ cifs_all_info_to_fattr(struct cifs_fattr *fattr, FILE_ALL_INFO *info,
if (fattr->cf_cifsattrs & ATTR_READONLY)
fattr->cf_mode &= ~(S_IWUGO);
- fattr->cf_nlink = le32_to_cpu(info->NumberOfLinks);
- if (fattr->cf_nlink < 1) {
- cifs_dbg(1, "replacing bogus file nlink value %u\n",
+ /*
+ * Don't accept zero nlink from non-unix servers unless
+ * delete is pending. Instead mark it as unknown.
+ */
+ if ((fattr->cf_nlink < 1) && !tcon->unix_ext &&
+ !info->DeletePending) {
+ cifs_dbg(1, "bogus file nlink value %u\n",
fattr->cf_nlink);
- fattr->cf_nlink = 1;
+ fattr->cf_flags |= CIFS_FATTR_UNKNOWN_NLINK;
}
}
diff --git a/fs/cifs/readdir.c b/fs/cifs/readdir.c
index 42ef03be089f..53a75f3d0179 100644
--- a/fs/cifs/readdir.c
+++ b/fs/cifs/readdir.c
@@ -180,6 +180,9 @@ cifs_fill_common_info(struct cifs_fattr *fattr, struct cifs_sb_info *cifs_sb)
fattr->cf_dtype = DT_REG;
}
+ /* non-unix readdir doesn't provide nlink */
+ fattr->cf_flags |= CIFS_FATTR_UNKNOWN_NLINK;
+
if (fattr->cf_cifsattrs & ATTR_READONLY)
fattr->cf_mode &= ~S_IWUGO;