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>

5 files changed, 40 insertions, 20 deletions

diff --git a/fs/cifs/dir.c b/fs/cifs/dir.c
index 3758965d73d5..7dc6b74f9def 100644
--- a/fs/cifs/dir.c
+++ b/fs/cifs/dir.c
@@ -307,8 +307,9 @@ cifs_create(struct inode *inode, struct dentry *direntry, int mode,
 
         full_path = build_path_from_dentry(direntry);
         if (full_path == NULL) {
+                rc = -ENOMEM;
                 FreeXid(xid);
-                return -ENOMEM;
+                return rc;
         }
 
         if (oplockEnabled)
@@ -540,8 +541,9 @@ int cifs_mknod(struct inode *inode, struct dentry *direntry, int mode,
                         buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
                         if (buf == NULL) {
                                 kfree(full_path);
+                                rc = -ENOMEM;
                                 FreeXid(xid);
-                                return -ENOMEM;
+                                return rc;
                         }
 
                         rc = CIFSSMBOpen(xid, pTcon, full_path,
diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index 06866841b97f..ebdbe62a829c 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -300,14 +300,16 @@ int cifs_open(struct inode *inode, struct file *file)
         pCifsInode = CIFS_I(file->f_path.dentry->d_inode);
         pCifsFile = cifs_fill_filedata(file);
         if (pCifsFile) {
+                rc = 0;
                 FreeXid(xid);
-                return 0;
+                return rc;
         }
 
         full_path = build_path_from_dentry(file->f_path.dentry);
         if (full_path == NULL) {
+                rc = -ENOMEM;
                 FreeXid(xid);
-                return -ENOMEM;
+                return rc;
         }
 
         cFYI(1, ("inode = 0x%p file flags are 0x%x for %s",
@@ -494,8 +496,9 @@ static int cifs_reopen_file(struct file *file, bool can_flush)
         mutex_unlock(&pCifsFile->fh_mutex);
         if (!pCifsFile->invalidHandle) {
                 mutex_lock(&pCifsFile->fh_mutex);
+                rc = 0;
                 FreeXid(xid);
-                return 0;
+                return rc;
         }
 
         if (file->f_path.dentry == NULL) {
@@ -845,8 +848,9 @@ int cifs_lock(struct file *file, int cmd, struct file_lock *pfLock)
         tcon = cifs_sb->tcon;
 
         if (file->private_data == NULL) {
+                rc = -EBADF;
                 FreeXid(xid);
-                return -EBADF;
+                return rc;
         }
         netfid = ((struct cifsFileInfo *)file->private_data)->netfid;
 
@@ -1805,8 +1809,9 @@ ssize_t cifs_user_read(struct file *file, char __user *read_data,
         pTcon = cifs_sb->tcon;
 
         if (file->private_data == NULL) {
+                rc = -EBADF;
                 FreeXid(xid);
-                return -EBADF;
+                return rc;
         }
         open_file = (struct cifsFileInfo *)file->private_data;
 
@@ -1885,8 +1890,9 @@ static ssize_t cifs_read(struct file *file, char *read_data, size_t read_size,
         pTcon = cifs_sb->tcon;
 
         if (file->private_data == NULL) {
+                rc = -EBADF;
                 FreeXid(xid);
-                return -EBADF;
+                return rc;
         }
         open_file = (struct cifsFileInfo *)file->private_data;
 
@@ -2019,8 +2025,9 @@ static int cifs_readpages(struct file *file, struct address_space *mapping,
 
         xid = GetXid();
         if (file->private_data == NULL) {
+                rc = -EBADF;
                 FreeXid(xid);
-                return -EBADF;
+                return rc;
         }
         open_file = (struct cifsFileInfo *)file->private_data;
         cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
@@ -2185,8 +2192,9 @@ static int cifs_readpage(struct file *file, struct page *page)
         xid = GetXid();
 
         if (file->private_data == NULL) {
+                rc = -EBADF;
                 FreeXid(xid);
-                return -EBADF;
+                return rc;
         }
 
         cFYI(1, ("readpage %p at offset %d 0x%x\n",
diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c
index fad882b075ba..155c9e785d0c 100644
--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -988,8 +988,9 @@ int cifs_unlink(struct inode *dir, struct dentry *dentry)
          * sb->s_vfs_rename_mutex here */
         full_path = build_path_from_dentry(dentry);
         if (full_path == NULL) {
+                rc = -ENOMEM;
                 FreeXid(xid);
-                return -ENOMEM;
+                return rc;
         }
 
         if ((tcon->ses->capabilities & CAP_UNIX) &&
@@ -1118,8 +1119,9 @@ int cifs_mkdir(struct inode *inode, struct dentry *direntry, int mode)
 
         full_path = build_path_from_dentry(direntry);
         if (full_path == NULL) {
+                rc = -ENOMEM;
                 FreeXid(xid);
-                return -ENOMEM;
+                return rc;
         }
 
         if ((pTcon->ses->capabilities & CAP_UNIX) &&
@@ -1303,8 +1305,9 @@ int cifs_rmdir(struct inode *inode, struct dentry *direntry)
 
         full_path = build_path_from_dentry(direntry);
         if (full_path == NULL) {
+                rc = -ENOMEM;
                 FreeXid(xid);
-                return -ENOMEM;
+                return rc;
         }
 
         rc = CIFSSMBRmDir(xid, pTcon, full_path, cifs_sb->local_nls,
@@ -1508,8 +1511,9 @@ int cifs_revalidate(struct dentry *direntry)
            since that would deadlock */
         full_path = build_path_from_dentry(direntry);
         if (full_path == NULL) {
+                rc = -ENOMEM;
                 FreeXid(xid);
-                return -ENOMEM;
+                return rc;
         }
         cFYI(1, ("Revalidate: %s inode 0x%p count %d dentry: 0x%p d_time %ld "
                  "jiffies %ld", full_path, direntry->d_inode,
@@ -1911,8 +1915,9 @@ cifs_setattr_nounix(struct dentry *direntry, struct iattr *attrs)
 
         full_path = build_path_from_dentry(direntry);
         if (full_path == NULL) {
+                rc = -ENOMEM;
                 FreeXid(xid);
-                return -ENOMEM;
+                return rc;
         }
 
         /*
diff --git a/fs/cifs/link.c b/fs/cifs/link.c
index cd83c53fcbb5..fc1e0487eaee 100644
--- a/fs/cifs/link.c
+++ b/fs/cifs/link.c
@@ -172,8 +172,9 @@ cifs_symlink(struct inode *inode, struct dentry *direntry, const char *symname)
         full_path = build_path_from_dentry(direntry);
 
         if (full_path == NULL) {
+                rc = -ENOMEM;
                 FreeXid(xid);
-                return -ENOMEM;
+                return rc;
         }
 
         cFYI(1, ("Full path: %s", full_path));
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 */