cifs: Fix incorrect return code being printed in cFYI messages

FreeXid() along with freeing Xid does add a cifsFYI debug message that
prints rc (return code) as well. In some code paths where we set/return
error code after calling FreeXid(), incorrect error code is being
printed when cifsFYI is enabled.

This could be misleading in few cases. For eg.
In cifs_open() if cifs_fill_filedata() returns a valid pointer to
cifsFileInfo, FreeXid() prints rc=-13 whereas 0 is actually being
returned. Fix this by setting rc before calling FreeXid().

Basically convert

FreeXid(xid);			rc = -ERR;
return -ERR;		=>	FreeXid(xid);
				return rc;

[Note that Christoph would like to replace the GetXid/FreeXid
calls, which are primarily used for debugging.  This seems
like a good longer term goal, but although there is an
alternative tracing facility, there are no examples yet
available that I know of that we can use (yet) to
convert this cifs function entry/exit logging, and for
creating an identifier that we can use to correlate
all dmesg log entries for a particular vfs operation
(ie identify all log entries for a particular vfs
request to cifs: e.g. a particular close or read or write
or byte range lock call ... and just using the thread id
is harder).  Eventually when a replacement
for this is available (e.g. when NFS switches over and various
samples to look at in other file systems) we can remove the
GetXid/FreeXid macro but in the meantime multiple people
use this run time configurable logging all the time
for debugging, and Suresh's patch fixes a problem
which made it harder to notice some low
memory problems in the log so it is worthwhile
to fix this problem until a better logging
approach is able to be used]

Acked-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Suresh Jayaraman <sjayaraman@suse.de>
Signed-off-by: Steve French <sfrench@us.ibm.com>

1 files changed, 8 insertions, 4 deletions

diff --git a/fs/cifs/xattr.c b/fs/cifs/xattr.c
index e9527eedc639..a75afa3dd9e1 100644
--- a/fs/cifs/xattr.c
+++ b/fs/cifs/xattr.c
@@ -64,8 +64,9 @@ int cifs_removexattr(struct dentry *direntry, const char *ea_name)
 
         full_path = build_path_from_dentry(direntry);
         if (full_path == NULL) {
+                rc = -ENOMEM;
                 FreeXid(xid);
-                return -ENOMEM;
+                return rc;
         }
         if (ea_name == NULL) {
                 cFYI(1, ("Null xattr names not supported"));
@@ -118,8 +119,9 @@ int cifs_setxattr(struct dentry *direntry, const char *ea_name,
 
         full_path = build_path_from_dentry(direntry);
         if (full_path == NULL) {
+                rc = -ENOMEM;
                 FreeXid(xid);
-                return -ENOMEM;
+                return rc;
         }
         /* return dos attributes as pseudo xattr */
         /* return alt name if available as pseudo attr */
@@ -225,8 +227,9 @@ ssize_t cifs_getxattr(struct dentry *direntry, const char *ea_name,
 
         full_path = build_path_from_dentry(direntry);
         if (full_path == NULL) {
+                rc = -ENOMEM;
                 FreeXid(xid);
-                return -ENOMEM;
+                return rc;
         }
         /* return dos attributes as pseudo xattr */
         /* return alt name if available as pseudo attr */
@@ -351,8 +354,9 @@ ssize_t cifs_listxattr(struct dentry *direntry, char *data, size_t buf_size)
 
         full_path = build_path_from_dentry(direntry);
         if (full_path == NULL) {
+                rc = -ENOMEM;
                 FreeXid(xid);
-                return -ENOMEM;
+                return rc;
         }
         /* return dos attributes as pseudo xattr */
         /* return alt name if available as pseudo attr */