From: Matthew Wilcox mawilcox@microsoft.com
This patch has been added to the 4.1 stable tree. If you have any objections, please let us know.
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[ Upstream commit f04a703c3d613845ae3141bfaf223489de8ab3eb ]
If cifs_zap_mapping() returned an error, we would return without putting the xid that we got earlier. Restructure cifs_file_strict_mmap() and cifs_file_mmap() to be more similar to each other and have a single point of return that always puts the xid.
Signed-off-by: Matthew Wilcox mawilcox@microsoft.com Signed-off-by: Steve French smfrench@gmail.com CC: Stable stable@vger.kernel.org Signed-off-by: Sasha Levin alexander.levin@microsoft.com --- fs/cifs/file.c | 26 ++++++++++++-------------- 1 file changed, 12 insertions(+), 14 deletions(-)
diff --git a/fs/cifs/file.c b/fs/cifs/file.c index 47e04038a846..1366d2151389 100644 --- a/fs/cifs/file.c +++ b/fs/cifs/file.c @@ -3231,20 +3231,18 @@ static struct vm_operations_struct cifs_file_vm_ops = {
int cifs_file_strict_mmap(struct file *file, struct vm_area_struct *vma) { - int rc, xid; + int xid, rc = 0; struct inode *inode = file_inode(file);
xid = get_xid();
- if (!CIFS_CACHE_READ(CIFS_I(inode))) { + if (!CIFS_CACHE_READ(CIFS_I(inode))) rc = cifs_zap_mapping(inode); - if (rc) - return rc; - } - - rc = generic_file_mmap(file, vma); - if (rc == 0) + if (!rc) + rc = generic_file_mmap(file, vma); + if (!rc) vma->vm_ops = &cifs_file_vm_ops; + free_xid(xid); return rc; } @@ -3254,16 +3252,16 @@ int cifs_file_mmap(struct file *file, struct vm_area_struct *vma) int rc, xid;
xid = get_xid(); + rc = cifs_revalidate_file(file); - if (rc) { + if (rc) cifs_dbg(FYI, "Validation prior to mmap failed, error=%d\n", rc); - free_xid(xid); - return rc; - } - rc = generic_file_mmap(file, vma); - if (rc == 0) + if (!rc) + rc = generic_file_mmap(file, vma); + if (!rc) vma->vm_ops = &cifs_file_vm_ops; + free_xid(xid); return rc; }