uss: CIFS gives error while accessing .snaps directory

CIFS sends getxattr call while accessing .snaps directory.
snapview server should return ENODATA if getxattr is called
on .snaps folder. Also flush on .snaps folder should be handled.

Windows client sends and getxattr call on the parent folder
of .snaps with a special key to get the real filename of a file.
This is used by samba to do case insensitive check of files.

Fixed few FreeBSD compilation error.

bug: 1168875

Change-Id: I74d5cb4419568c8ed8709ba6d1ddff0e41392204
Signed-off-by: Rajesh Joseph <rjoseph@redhat.com>
Reviewed-on: http://review.gluster.org/9211
Reviewed-by: Raghavendra Bhat <raghavendra@redhat.com>
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Vijay Bellur <vbellur@redhat.com>

1 files changed, 48 insertions, 7 deletions

diff --git a/xlators/features/snapview-client/src/snapview-client.c b/xlators/features/snapview-client/src/snapview-client.c
index 0f8913d18ce..849cab390fa 100644
--- a/xlators/features/snapview-client/src/snapview-client.c
+++ b/xlators/features/snapview-client/src/snapview-client.c
@@ -546,17 +546,58 @@ int32_t
 svc_getxattr (call_frame_t *frame, xlator_t *this, loc_t *loc, const char *name,
               dict_t *xdata)
 {
-        int32_t        ret        = -1;
-        int            inode_type = -1;
-        xlator_t      *subvolume  = NULL;
-        int            op_ret     = -1;
-        int            op_errno   = EINVAL;
-        gf_boolean_t   wind       = _gf_false;
+        int32_t          ret                    = -1;
+        int              inode_type             = -1;
+        xlator_t        *subvolume              = NULL;
+        int              op_ret                 = -1;
+        int              op_errno               = EINVAL;
+        gf_boolean_t     wind                   = _gf_false;
+        svc_private_t   *priv                   = NULL;
+        char             attrname[PATH_MAX]     = "";
+        char             attrval[64]            = "";
+        dict_t          *dict                   = NULL;
 
         GF_VALIDATE_OR_GOTO ("svc", this, out);
         GF_VALIDATE_OR_GOTO (this->name, frame, out);
         GF_VALIDATE_OR_GOTO (this->name, loc, out);
         GF_VALIDATE_OR_GOTO (this->name, loc->inode, out);
+        priv = this->private;
+        GF_VALIDATE_OR_GOTO (this->name, priv, out);
+
+        /*
+         * Samba sends this special key for case insensitive
+         * filename check. This request comes with a parent
+         * path and with a special key GF_XATTR_GET_REAL_FILENAME_KEY.
+         * e.g. "glusterfs.get_real_filename:.snaps".
+         * If the name variable matches this key then we have
+         * to send back .snaps as the real filename.
+         */
+        sscanf (name, "%[^:]:%[^@]", attrname, attrval);
+        strcat (attrname, ":");
+
+        if (!strcmp (attrname, GF_XATTR_GET_REAL_FILENAME_KEY)) {
+                if (!strcasecmp (attrval, priv->path)) {
+                        dict = dict_new ();
+                        if (NULL == dict) {
+                                op_errno = ENOMEM;
+                                goto out;
+                        }
+
+                        ret = dict_set_dynstr_with_alloc (dict,
+                                        (char *)name,
+                                        priv->path);
+                        if (ret) {
+                                op_errno = ENOMEM;
+                                dict_unref (dict);
+                                goto out;
+                        }
+
+                        op_errno = 0;
+                        op_ret = strlen (priv->path) + 1;
+                        /* We should return from here */
+                        goto out;
+                }
+        }
 
         SVC_GET_SUBVOL_FROM_CTX (this, op_ret, op_errno, inode_type, ret,
                                  loc->inode, subvolume, out);
@@ -569,7 +610,7 @@ svc_getxattr (call_frame_t *frame, xlator_t *this, loc_t *loc, const char *name,
 out:
         if (!wind)
                 SVC_STACK_UNWIND (getxattr, frame, op_ret, op_errno,
-                                  NULL, NULL);
+                                  dict, NULL);
 
         return 0;
 }