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authorPavel Shilovsky <pshilov@microsoft.com>2019-01-16 22:48:42 +0300
committerSteve French <stfrench@microsoft.com>2019-01-24 23:52:06 +0300
commit6a9cbdd1ceca1dc2359ddf082efe61b97c3e752b (patch)
tree50e009bad1b6d8cce27aa1ee1fc8088a67951be1 /fs/cifs/smb2inode.c
parent0fd1d37b0501efc6e295f56ab55cdaff784aa50c (diff)
downloadlinux-6a9cbdd1ceca1dc2359ddf082efe61b97c3e752b.tar.xz
CIFS: Fix mounts if the client is low on credits
If the server doesn't grant us at least 3 credits during the mount we won't be able to complete it because query path info operation requires 3 credits. Use the cached file handle if possible to allow the mount to succeed. Signed-off-by: Pavel Shilovsky <pshilov@microsoft.com> Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com> Signed-off-by: Steve French <stfrench@microsoft.com>
Diffstat (limited to 'fs/cifs/smb2inode.c')
-rw-r--r--fs/cifs/smb2inode.c17
1 files changed, 17 insertions, 0 deletions
diff --git a/fs/cifs/smb2inode.c b/fs/cifs/smb2inode.c
index f14533da3a93..01a76bccdb8d 100644
--- a/fs/cifs/smb2inode.c
+++ b/fs/cifs/smb2inode.c
@@ -293,6 +293,8 @@ smb2_query_path_info(const unsigned int xid, struct cifs_tcon *tcon,
int rc;
struct smb2_file_all_info *smb2_data;
__u32 create_options = 0;
+ struct cifs_fid fid;
+ bool no_cached_open = tcon->nohandlecache;
*adjust_tz = false;
*symlink = false;
@@ -301,6 +303,21 @@ smb2_query_path_info(const unsigned int xid, struct cifs_tcon *tcon,
GFP_KERNEL);
if (smb2_data == NULL)
return -ENOMEM;
+
+ /* If it is a root and its handle is cached then use it */
+ if (!strlen(full_path) && !no_cached_open) {
+ rc = open_shroot(xid, tcon, &fid);
+ if (rc)
+ goto out;
+ rc = SMB2_query_info(xid, tcon, fid.persistent_fid,
+ fid.volatile_fid, smb2_data);
+ close_shroot(&tcon->crfid);
+ if (rc)
+ goto out;
+ move_smb2_info_to_cifs(data, smb2_data);
+ goto out;
+ }
+
if (backup_cred(cifs_sb))
create_options |= CREATE_OPEN_BACKUP_INTENT;