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authorBasavanagowda Kanur <gowda@gluster.com>2009-06-30 00:43:56 +0000
committerAnand V. Avati <avati@dev.gluster.com>2009-06-30 15:24:52 -0700
commiteeeffd41703003be30b3f1811fa54f5f8047ed73 (patch)
tree47f0cec91c247301effefb208285827ca014d5eb /xlators/cluster/afr/src
parenta3ece0caa52ad2eacf8a8691aaca53295cde972f (diff)
cluster/afr - use different dictionaries for sending xattrop requests to each of the subvolume
- This patch fixes bug #29. - Using separate copies of dictionaries also eliminates a potential bug in a setup consisting of afr with a posix and client, each having io-threads on top as children. Since posix_xattrop after performing required operations on the xattr array passed in dictionary, sets the result at the same key and in the same dictionary passed as input argument, there can be race conditions where in the results of the operation on posix-child can be sent to the other child as input argument for xattrop, which ofcourse is wrong. Signed-off-by: Anand V. Avati <avati@dev.gluster.com>
Diffstat (limited to 'xlators/cluster/afr/src')
-rw-r--r--xlators/cluster/afr/src/afr-transaction.c74
1 files changed, 50 insertions, 24 deletions
diff --git a/xlators/cluster/afr/src/afr-transaction.c b/xlators/cluster/afr/src/afr-transaction.c
index 828a6e9abac..80c96e887f1 100644
--- a/xlators/cluster/afr/src/afr-transaction.c
+++ b/xlators/cluster/afr/src/afr-transaction.c
@@ -24,6 +24,7 @@
#include "afr-transaction.h"
#include <signal.h>
+#include <alloca.h>
static void
@@ -549,7 +550,7 @@ afr_changelog_post_op (call_frame_t *frame, xlator_t *this)
int call_count = 0;
afr_local_t * local = NULL;
- dict_t * xattr = dict_ref (get_new_dict ());
+ dict_t **xattr = NULL;
local = frame->local;
@@ -562,6 +563,13 @@ afr_changelog_post_op (call_frame_t *frame, xlator_t *this)
local->transaction.type);
}
+ xattr = alloca (priv->child_count * sizeof (*xattr));
+ memset (xattr, 0, (priv->child_count * sizeof (*xattr)));
+ for (i = 0; i < priv->child_count; i++) {
+ xattr[i] = get_new_dict ();
+ dict_ref (xattr[i]);
+ }
+
call_count = afr_up_children_count (priv->child_count, local->child_up);
if (local->transaction.type == AFR_ENTRY_RENAME_TRANSACTION) {
@@ -572,14 +580,17 @@ afr_changelog_post_op (call_frame_t *frame, xlator_t *this)
if (call_count == 0) {
/* no child is up */
- dict_unref (xattr);
+ for (i = 0; i < priv->child_count; i++) {
+ dict_unref (xattr[i]);
+ }
+
afr_unlock (frame, this);
return 0;
}
for (i = 0; i < priv->child_count; i++) {
if (local->child_up[i]) {
- ret = afr_set_pending_dict (priv, xattr,
+ ret = afr_set_pending_dict (priv, xattr[i],
local->pending);
if (ret < 0)
@@ -597,13 +608,13 @@ afr_changelog_post_op (call_frame_t *frame, xlator_t *this)
priv->children[i],
priv->children[i]->fops->fxattrop,
local->fd,
- GF_XATTROP_ADD_ARRAY, xattr);
+ GF_XATTROP_ADD_ARRAY, xattr[i]);
else
STACK_WIND (frame, afr_changelog_post_op_cbk,
priv->children[i],
priv->children[i]->fops->xattrop,
&local->loc,
- GF_XATTROP_ADD_ARRAY, xattr);
+ GF_XATTROP_ADD_ARRAY, xattr[i]);
}
break;
@@ -614,7 +625,7 @@ afr_changelog_post_op (call_frame_t *frame, xlator_t *this)
priv->children[i],
priv->children[i]->fops->xattrop,
&local->transaction.new_parent_loc,
- GF_XATTROP_ADD_ARRAY, xattr);
+ GF_XATTROP_ADD_ARRAY, xattr[i]);
call_count--;
}
@@ -627,7 +638,7 @@ afr_changelog_post_op (call_frame_t *frame, xlator_t *this)
value
*/
- ret = afr_set_pending_dict (priv, xattr,
+ ret = afr_set_pending_dict (priv, xattr[i],
local->pending);
if (ret < 0)
@@ -643,13 +654,13 @@ afr_changelog_post_op (call_frame_t *frame, xlator_t *this)
priv->children[i],
priv->children[i]->fops->fxattrop,
local->fd,
- GF_XATTROP_ADD_ARRAY, xattr);
+ GF_XATTROP_ADD_ARRAY, xattr[i]);
else
STACK_WIND (frame, afr_changelog_post_op_cbk,
priv->children[i],
priv->children[i]->fops->xattrop,
&local->transaction.parent_loc,
- GF_XATTROP_ADD_ARRAY, xattr);
+ GF_XATTROP_ADD_ARRAY, xattr[i]);
}
break;
}
@@ -658,8 +669,11 @@ afr_changelog_post_op (call_frame_t *frame, xlator_t *this)
break;
}
}
-
- dict_unref (xattr);
+
+ for (i = 0; i < priv->child_count; i++) {
+ dict_unref (xattr[i]);
+ }
+
return 0;
}
@@ -728,13 +742,19 @@ afr_changelog_pre_op (call_frame_t *frame, xlator_t *this)
int i = 0;
int ret = 0;
int call_count = 0;
- dict_t *xattr = NULL;
+ dict_t **xattr = NULL;
afr_local_t *local = NULL;
local = frame->local;
- xattr = get_new_dict ();
- dict_ref (xattr);
+
+ xattr = alloca (priv->child_count * sizeof (*xattr));
+ memset (xattr, 0, (priv->child_count * sizeof (*xattr)));
+
+ for (i = 0; i < priv->child_count; i++) {
+ xattr[i] = get_new_dict ();
+ dict_ref (xattr[i]);
+ }
call_count = afr_up_children_count (priv->child_count,
local->child_up);
@@ -745,7 +765,10 @@ afr_changelog_pre_op (call_frame_t *frame, xlator_t *this)
if (call_count == 0) {
/* no child is up */
- dict_unref (xattr);
+ for (i = 0; i < priv->child_count; i++) {
+ dict_unref (xattr[i]);
+ }
+
afr_unlock (frame, this);
return 0;
}
@@ -757,7 +780,7 @@ afr_changelog_pre_op (call_frame_t *frame, xlator_t *this)
for (i = 0; i < priv->child_count; i++) {
if (local->child_up[i]) {
- ret = afr_set_pending_dict (priv, xattr,
+ ret = afr_set_pending_dict (priv, xattr[i],
local->pending);
if (ret < 0)
@@ -777,7 +800,7 @@ afr_changelog_pre_op (call_frame_t *frame, xlator_t *this)
priv->children[i],
priv->children[i]->fops->fxattrop,
local->fd,
- GF_XATTROP_ADD_ARRAY, xattr);
+ GF_XATTROP_ADD_ARRAY, xattr[i]);
else
STACK_WIND_COOKIE (frame,
afr_changelog_pre_op_cbk,
@@ -785,7 +808,7 @@ afr_changelog_pre_op (call_frame_t *frame, xlator_t *this)
priv->children[i],
priv->children[i]->fops->xattrop,
&(local->loc),
- GF_XATTROP_ADD_ARRAY, xattr);
+ GF_XATTROP_ADD_ARRAY, xattr[i]);
}
break;
@@ -797,7 +820,7 @@ afr_changelog_pre_op (call_frame_t *frame, xlator_t *this)
priv->children[i],
priv->children[i]->fops->xattrop,
&local->transaction.new_parent_loc,
- GF_XATTROP_ADD_ARRAY, xattr);
+ GF_XATTROP_ADD_ARRAY, xattr[i]);
call_count--;
}
@@ -811,7 +834,7 @@ afr_changelog_pre_op (call_frame_t *frame, xlator_t *this)
value
*/
- ret = afr_set_pending_dict (priv, xattr,
+ ret = afr_set_pending_dict (priv, xattr[i],
local->pending);
if (ret < 0)
@@ -829,7 +852,7 @@ afr_changelog_pre_op (call_frame_t *frame, xlator_t *this)
priv->children[i],
priv->children[i]->fops->fxattrop,
local->fd,
- GF_XATTROP_ADD_ARRAY, xattr);
+ GF_XATTROP_ADD_ARRAY, xattr[i]);
else
STACK_WIND_COOKIE (frame,
afr_changelog_pre_op_cbk,
@@ -837,7 +860,7 @@ afr_changelog_pre_op (call_frame_t *frame, xlator_t *this)
priv->children[i],
priv->children[i]->fops->xattrop,
&local->transaction.parent_loc,
- GF_XATTROP_ADD_ARRAY, xattr);
+ GF_XATTROP_ADD_ARRAY, xattr[i]);
}
break;
@@ -847,8 +870,11 @@ afr_changelog_pre_op (call_frame_t *frame, xlator_t *this)
break;
}
}
-
- dict_unref (xattr);
+
+ for (i = 0; i < priv->child_count; i++) {
+ dict_unref (xattr[i]);
+ }
+
return 0;
}