[CIFS] Allow disabling CIFS Unix Extensions as mount option

Previously the only way to do this was to umount all mounts to that server,
turn off a proc setting (/proc/fs/cifs/LinuxExtensionsEnabled).

Fixes Samba bugzilla bug number: 4582 (and also 2008)

Signed-off-by: Steve French <sfrench@us.ibm.com>

1 files changed, 7 insertions, 6 deletions

diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c
index 3482879b3d3f..dd4167762a8e 100644
--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -583,7 +583,8 @@ void cifs_read_inode(struct inode *inode)
 
         cifs_sb = CIFS_SB(inode->i_sb);
         xid = GetXid();
-        if (cifs_sb->tcon->ses->capabilities & CAP_UNIX)
+
+        if (cifs_sb->tcon->unix_ext)
                 cifs_get_inode_info_unix(&inode, "", inode->i_sb, xid);
         else
                 cifs_get_inode_info(&inode, "", NULL, inode->i_sb, xid);
@@ -981,7 +982,7 @@ int cifs_mkdir(struct inode *inode, struct dentry *direntry, int mode)
         } else {
 mkdir_get_info:
                 inc_nlink(inode);
-                if (pTcon->ses->capabilities & CAP_UNIX)
+                if (pTcon->unix_ext)
                         rc = cifs_get_inode_info_unix(&newinode, full_path,
                                                       inode->i_sb, xid);
                 else
@@ -997,7 +998,7 @@ mkdir_get_info:
                   * failed to get it from the server or was set bogus */
                 if ((direntry->d_inode) && (direntry->d_inode->i_nlink < 2))
                                 direntry->d_inode->i_nlink = 2;
-                if (cifs_sb->tcon->ses->capabilities & CAP_UNIX) {
+                if (pTcon->unix_ext) {
                         mode &= ~current->fs->umask;
                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
                                 CIFSSMBUnixSetPerms(xid, pTcon, full_path,
@@ -1130,7 +1131,7 @@ int cifs_rename(struct inode *source_inode, struct dentry *source_direntry,
                         kmalloc(2 * sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
                 if (info_buf_source != NULL) {
                         info_buf_target = info_buf_source + 1;
-                        if (pTcon->ses->capabilities & CAP_UNIX)
+                        if (pTcon->unix_ext)
                                 rc = CIFSSMBUnixQPathInfo(xid, pTcon, fromName,
                                         info_buf_source,
                                         cifs_sb_source->local_nls,
@@ -1258,7 +1259,7 @@ int cifs_revalidate(struct dentry *direntry)
         local_mtime = direntry->d_inode->i_mtime;
         local_size = direntry->d_inode->i_size;
 
-        if (cifs_sb->tcon->ses->capabilities & CAP_UNIX) {
+        if (cifs_sb->tcon->unix_ext) {
                 rc = cifs_get_inode_info_unix(&direntry->d_inode, full_path,
                                               direntry->d_sb, xid);
                 if (rc) {
@@ -1542,7 +1543,7 @@ int cifs_setattr(struct dentry *direntry, struct iattr *attrs)
                 mode = attrs->ia_mode;
         }
 
-        if ((cifs_sb->tcon->ses->capabilities & CAP_UNIX)
+        if ((pTcon->unix_ext)
             && (attrs->ia_valid & (ATTR_MODE | ATTR_GID | ATTR_UID)))
                 rc = CIFSSMBUnixSetPerms(xid, pTcon, full_path, mode, uid, gid,
                                          0 /* dev_t */, cifs_sb->local_nls,