[CIFS] DFS support patchset: Added mountdata

Also cifs_fs_type was made not static for ussage in dfs code.

Signed-off-by: Igor Mammedov <niallain@gmail.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>

diff --git a/fs/cifs/cifs_fs_sb.h b/fs/cifs/cifs_fs_sb.h
index 34af556..8ad2330 100644 (file)
--- a/fs/cifs/cifs_fs_sb.h
+++ b/fs/cifs/cifs_fs_sb.h
@@ -43,6 +43,9 @@ struct cifs_sb_info {
        mode_t  mnt_dir_mode;
        int     mnt_cifs_flags;
        int     prepathlen;
-       char   *prepath;
+       char   *prepath; /* relative path under the share to mount to */
+#ifdef CONFIG_CIFS_DFS_UPCALL
+       char   *mountdata; /* mount options received at mount time */
+#endif
 };
 #endif                         /* _CIFS_FS_SB_H */

diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
index 000b4a5..93e1078 100644 (file)
--- a/fs/cifs/cifsfs.c
+++ b/fs/cifs/cifsfs.c
@@ -97,6 +97,9 @@ cifs_read_super(struct super_block *sb, void *data,
 {
        struct inode *inode;
        struct cifs_sb_info *cifs_sb;
+#ifdef CONFIG_CIFS_DFS_UPCALL
+       int len;
+#endif
        int rc = 0;
 
        /* BB should we make this contingent on mount parm? */
@@ -106,6 +109,25 @@ cifs_read_super(struct super_block *sb, void *data,
        if (cifs_sb == NULL)
                return -ENOMEM;
 
+#ifdef CONFIG_CIFS_DFS_UPCALL
+       /* copy mount params to sb for use in submounts */
+       /* BB: should we move this after the mount so we
+        * do not have to do the copy on failed mounts?
+        * BB: May be it is better to do simple copy before
+        * complex operation (mount), and in case of fail
+        * just exit instead of doing mount and attempting
+        * undo it if this copy fails?*/
+       len = strlen(data);
+       cifs_sb->mountdata = kzalloc(len + 1, GFP_KERNEL);
+       if (cifs_sb->mountdata == NULL) {
+               kfree(sb->s_fs_info);
+               sb->s_fs_info = NULL;
+               return -ENOMEM;
+       }
+       strncpy(cifs_sb->mountdata, data, len + 1);
+       cifs_sb->mountdata[len] = '\0';
+#endif
+
        rc = cifs_mount(sb, cifs_sb, data, devname);
 
        if (rc) {
@@ -155,6 +177,12 @@ out_no_root:
 
 out_mount_failed:
        if (cifs_sb) {
+#ifdef CONFIG_CIFS_DFS_UPCALL
+               if (cifs_sb->mountdata) {
+                       kfree(cifs_sb->mountdata);
+                       cifs_sb->mountdata = NULL;
+               }
+#endif
                if (cifs_sb->local_nls)
                        unload_nls(cifs_sb->local_nls);
                kfree(cifs_sb);
@@ -178,6 +206,13 @@ cifs_put_super(struct super_block *sb)
        if (rc) {
                cERROR(1, ("cifs_umount failed with return code %d", rc));
        }
+#ifdef CONFIG_CIFS_DFS_UPCALL
+       if (cifs_sb->mountdata) {
+               kfree(cifs_sb->mountdata);
+               cifs_sb->mountdata = NULL;
+       }
+#endif
+
        unload_nls(cifs_sb->local_nls);
        kfree(cifs_sb);
        return;
@@ -553,7 +588,7 @@ static loff_t cifs_llseek(struct file *file, loff_t offset, int origin)
        return remote_llseek(file, offset, origin);
 }
 
-static struct file_system_type cifs_fs_type = {
+struct file_system_type cifs_fs_type = {
        .owner = THIS_MODULE,
        .name = "cifs",
        .get_sb = cifs_get_sb,

diff --git a/fs/cifs/cifsfs.h b/fs/cifs/cifsfs.h
index 2a21dc6..2e68126 100644 (file)
--- a/fs/cifs/cifsfs.h
+++ b/fs/cifs/cifsfs.h
@@ -32,6 +32,7 @@
 #define TRUE 1
 #endif
 
+extern struct file_system_type cifs_fs_type;
 extern const struct address_space_operations cifs_addr_ops;
 extern const struct address_space_operations cifs_addr_ops_smallbuf;