cifs: obtain file access during backup intent lookup (resend)
Rebased and resending the patch.
Path based queries can fail for lack of access, especially during lookup
during open.
open itself would actually succeed becasue of back up intent bit
but queries (either path or file handle based) do not have a means to
specifiy backup intent bit.
So query the file info during lookup using
trans2 / findfirst / file_id_full_dir_info
to obtain file info as well as file_id/inode value.
Signed-off-by: Shirish Pargaonkar <shirishpargaonkar@gmail.com>
Acked-by: Jeff Layton <jlayton@samba.org>
Signed-off-by: Steve French <smfrench@gmail.com>
diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c
index 3d15587..afdff79 100644
--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -607,7 +607,9 @@
FILE_ALL_INFO *data, struct super_block *sb, int xid,
const __u16 *fid)
{
- int rc = 0, tmprc;
+ bool validinum = false;
+ __u16 srchflgs;
+ int rc = 0, tmprc = ENOSYS;
struct cifs_tcon *tcon;
struct TCP_Server_Info *server;
struct tcon_link *tlink;
@@ -615,6 +617,7 @@
char *buf = NULL;
bool adjust_tz = false;
struct cifs_fattr fattr;
+ struct cifs_search_info *srchinf = NULL;
tlink = cifs_sb_tlink(cifs_sb);
if (IS_ERR(tlink))
@@ -653,9 +656,38 @@
} else if (rc == -EREMOTE) {
cifs_create_dfs_fattr(&fattr, sb);
rc = 0;
- } else {
+ } else if (rc == -EACCES && backup_cred(cifs_sb)) {
+ srchinf = kzalloc(sizeof(struct cifs_search_info),
+ GFP_KERNEL);
+ if (srchinf == NULL) {
+ rc = -ENOMEM;
+ goto cgii_exit;
+ }
+
+ srchinf->endOfSearch = false;
+ srchinf->info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;
+
+ srchflgs = CIFS_SEARCH_CLOSE_ALWAYS |
+ CIFS_SEARCH_CLOSE_AT_END |
+ CIFS_SEARCH_BACKUP_SEARCH;
+
+ rc = CIFSFindFirst(xid, tcon, full_path,
+ cifs_sb, NULL, srchflgs, srchinf, false);
+ if (!rc) {
+ data =
+ (FILE_ALL_INFO *)srchinf->srch_entries_start;
+
+ cifs_dir_info_to_fattr(&fattr,
+ (FILE_DIRECTORY_INFO *)data, cifs_sb);
+ fattr.cf_uniqueid = le64_to_cpu(
+ ((SEARCH_ID_FULL_DIR_INFO *)data)->UniqueId);
+ validinum = true;
+
+ cifs_buf_release(srchinf->ntwrk_buf_start);
+ }
+ kfree(srchinf);
+ } else
goto cgii_exit;
- }
/*
* If an inode wasn't passed in, then get the inode number
@@ -666,23 +698,21 @@
*/
if (*inode == NULL) {
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
- if (server->ops->get_srv_inum)
- tmprc = server->ops->get_srv_inum(xid, tcon,
- cifs_sb, full_path, &fattr.cf_uniqueid,
- data);
- else
- tmprc = -ENOSYS;
- if (tmprc || !fattr.cf_uniqueid) {
- cFYI(1, "GetSrvInodeNum rc %d", tmprc);
- fattr.cf_uniqueid = iunique(sb, ROOT_I);
- cifs_autodisable_serverino(cifs_sb);
+ if (validinum == false) {
+ if (server->ops->get_srv_inum)
+ tmprc = server->ops->get_srv_inum(xid,
+ tcon, cifs_sb, full_path,
+ &fattr.cf_uniqueid, data);
+ if (tmprc) {
+ cFYI(1, "GetSrvInodeNum rc %d", tmprc);
+ fattr.cf_uniqueid = iunique(sb, ROOT_I);
+ cifs_autodisable_serverino(cifs_sb);
+ }
}
- } else {
+ } else
fattr.cf_uniqueid = iunique(sb, ROOT_I);
- }
- } else {
+ } else
fattr.cf_uniqueid = CIFS_I(*inode)->uniqueid;
- }
/* query for SFU type info if supported and needed */
if (fattr.cf_cifsattrs & ATTR_SYSTEM &&