cluster/dht: Fix dht_setxattr to follow files under migration

If a file is under migration, then any xattrs created on it
are lost post migration of the file. This is because
the xattrs are set only on the cached subvol of the source
and as the source is under migration, it becomes a linkto file
post migration.

Change-Id: Ib8e233b519cf954e7723c6e26b38fa8f9b8c85c0
BUG: 1225839
Signed-off-by: Nithya Balachandran <nbalacha@redhat.com>
Reviewed-on: http://review.gluster.org/10968
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Raghavendra G <rgowdapp@redhat.com>
Tested-by: Raghavendra G <rgowdapp@redhat.com>

1 files changed, 111 insertions, 12 deletions

diff --git a/xlators/storage/posix/src/posix.c b/xlators/storage/posix/src/posix.c
index fbbeacd28b1..71b83c2e0ac 100644
--- a/xlators/storage/posix/src/posix.c
+++ b/xlators/storage/posix/src/posix.c
@@ -3239,6 +3239,31 @@ map_xattr_flags(int flags)
 }
 #endif
 
+static
+int32_t posix_set_iatt_in_dict (dict_t *dict, struct iatt *in_stbuf)
+{
+        int ret             = -1;
+        struct iatt *stbuf  = NULL;
+        int32_t len         = sizeof(struct iatt);
+
+        if (!dict || !in_stbuf)
+                return ret;
+
+        stbuf = GF_CALLOC (1, len, gf_common_mt_char);
+        if (!stbuf)
+                return ret;
+
+        memcpy (stbuf, in_stbuf, len);
+
+        ret = dict_set_bin (dict, DHT_IATT_IN_XDATA_KEY, stbuf, len);
+        if (ret)
+                GF_FREE (stbuf);
+
+        return ret;
+}
+
+
+
 int32_t
 posix_setxattr (call_frame_t *frame, xlator_t *this,
                 loc_t *loc, dict_t *dict, int flags, dict_t *xdata)
@@ -3246,7 +3271,9 @@ posix_setxattr (call_frame_t *frame, xlator_t *this,
         int32_t       op_ret                  = -1;
         int32_t       op_errno                = 0;
         char *        real_path               = NULL;
-
+        struct iatt   stbuf                   = {0};
+        int32_t       ret                     = 0;
+        dict_t       *xattr                   = NULL;
         posix_xattr_filler_t filler = {0,};
 
         DECLARE_OLD_FS_ID_VAR;
@@ -3265,6 +3292,7 @@ posix_setxattr (call_frame_t *frame, xlator_t *this,
         }
 
         op_ret = -1;
+
         dict_del (dict, GFID_XATTR_KEY);
         dict_del (dict, GF_XATTR_VOL_ID_KEY);
 
@@ -3280,12 +3308,31 @@ posix_setxattr (call_frame_t *frame, xlator_t *this,
         if (op_ret < 0) {
                 op_errno = -op_ret;
                 op_ret = -1;
+                goto out;
         }
 
+/*
+ * FIXFIX: Send the stbuf info in the xdata for now
+ * This is used by DHT to redirect FOPs if the file is being migrated
+ * Ignore errors for now
+ */
+        if (dict_get (xdata, DHT_IATT_IN_XDATA_KEY)) {
+                ret = posix_pstat(this, loc->gfid, real_path, &stbuf);
+                if (ret)
+                        goto out;
+
+                xattr = dict_new();
+                if (!xattr)
+                        goto out;
+                ret = posix_set_iatt_in_dict (xattr, &stbuf);
+        }
 out:
         SET_TO_OLD_FS_ID ();
 
-        STACK_UNWIND_STRICT (setxattr, frame, op_ret, op_errno, NULL);
+        STACK_UNWIND_STRICT (setxattr, frame, op_ret, op_errno, xattr);
+
+        if (xattr)
+                dict_unref(xattr);
 
         return 0;
 }
@@ -4313,13 +4360,14 @@ int32_t
 posix_fsetxattr (call_frame_t *frame, xlator_t *this,
                  fd_t *fd, dict_t *dict, int flags, dict_t *xdata)
 {
-        int32_t            op_ret       = -1;
-        int32_t            op_errno     = 0;
-        struct posix_fd *  pfd          = NULL;
-        int                _fd          = -1;
-        int                ret          = -1;
-
-        posix_xattr_filler_t filler = {0,};
+        int32_t            op_ret         = -1;
+        int32_t            op_errno       = 0;
+        struct posix_fd   *pfd            = NULL;
+        int                _fd            = -1;
+        int                ret            = -1;
+        struct  iatt       stbuf          = {0,};
+        dict_t            *xattr          = NULL;
+        posix_xattr_filler_t filler       = {0,};
 
         DECLARE_OLD_FS_ID_VAR;
         SET_FS_ID (frame->root->uid, frame->root->gid);
@@ -4366,10 +4414,28 @@ posix_fsetxattr (call_frame_t *frame, xlator_t *this,
                 }
         }
 
+        if (dict_get (xdata, DHT_IATT_IN_XDATA_KEY)) {
+                ret = posix_fdstat (this, pfd->fd, &stbuf);
+                if (ret == -1) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "fsetxattr (fstat) failed on fd=%p: %s",
+                                fd, strerror (op_errno));
+                        goto out;
+                }
+
+                xattr = dict_new ();
+                if (!xattr)
+                        goto out;
+                ret = posix_set_iatt_in_dict (xattr, &stbuf);
+        }
+
 out:
         SET_TO_OLD_FS_ID ();
 
-        STACK_UNWIND_STRICT (fsetxattr, frame, op_ret, op_errno, NULL);
+        STACK_UNWIND_STRICT (fsetxattr, frame, op_ret, op_errno, xattr);
+
+        if (xattr)
+                dict_unref (xattr);
 
         return 0;
 }
@@ -4429,7 +4495,10 @@ posix_removexattr (call_frame_t *frame, xlator_t *this,
 {
         int32_t op_ret    = -1;
         int32_t op_errno  = 0;
+        int32_t ret    = -1;
         char *  real_path = NULL;
+        struct iatt   stbuf         = {0};
+        dict_t  *xattr    = NULL;
         posix_xattr_filler_t filler = {0,};
 
         DECLARE_OLD_FS_ID_VAR;
@@ -4485,12 +4554,26 @@ posix_removexattr (call_frame_t *frame, xlator_t *this,
                 goto out;
         }
 
+        if (dict_get (xdata, DHT_IATT_IN_XDATA_KEY)) {
+                ret = posix_pstat(this, loc->gfid, real_path, &stbuf);
+                if (ret)
+                        goto out;
+                xattr = dict_new();
+                if (!xattr)
+                        goto out;
+
+                ret = posix_set_iatt_in_dict (xattr, &stbuf);
+        }
         op_ret = 0;
 
 out:
         SET_TO_OLD_FS_ID ();
 
-        STACK_UNWIND_STRICT (removexattr, frame, op_ret, op_errno, NULL);
+        STACK_UNWIND_STRICT (removexattr, frame, op_ret, op_errno, xattr);
+
+        if (xattr)
+                dict_unref (xattr);
+
         return 0;
 }
 
@@ -4501,6 +4584,8 @@ posix_fremovexattr (call_frame_t *frame, xlator_t *this,
         int32_t           op_ret   = -1;
         int32_t           op_errno = 0;
         struct posix_fd * pfd      = NULL;
+        struct iatt       stbuf    = {0,};
+        dict_t           *xattr    = NULL;
         int               _fd      = -1;
         int               ret      = -1;
 
@@ -4541,12 +4626,26 @@ posix_fremovexattr (call_frame_t *frame, xlator_t *this,
                 goto out;
         }
 
+        if (dict_get (xdata, DHT_IATT_IN_XDATA_KEY)) {
+                ret = posix_fdstat (this, pfd->fd, &stbuf);
+                if (ret)
+                        goto out;
+                xattr = dict_new();
+                if (!xattr)
+                        goto out;
+
+                ret = posix_set_iatt_in_dict (xattr, &stbuf);
+        }
         op_ret = 0;
 
 out:
         SET_TO_OLD_FS_ID ();
 
-        STACK_UNWIND_STRICT (fremovexattr, frame, op_ret, op_errno, NULL);
+        STACK_UNWIND_STRICT (fremovexattr, frame, op_ret, op_errno, xattr);
+
+        if (xattr)
+                dict_unref (xattr);
+
         return 0;
 }