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authorPranith Kumar K <pkarampu@redhat.com>2013-07-22 16:44:09 +0530
committerVijay Bellur <vbellur@redhat.com>2013-07-23 00:33:39 -0700
commiteef0737ca6ae8056d906c7bff0a9280cc748270e (patch)
treeb71f4b68eddc859cdbbfc90d9442545fbb5c1efa /xlators/cluster
parentfa787929ba37e483ad041e090a82c14e3b7de900 (diff)
cluster/afr: Handle parallel hardlinks self-heal
Change-Id: Ieda11870c65edae500140b6c061f15a7b3f264f3 BUG: 986905 Signed-off-by: Pranith Kumar K <pkarampu@redhat.com> Reviewed-on: http://review.gluster.org/5370 Tested-by: Gluster Build System <jenkins@build.gluster.com> Reviewed-by: Vijay Bellur <vbellur@redhat.com>
Diffstat (limited to 'xlators/cluster')
-rw-r--r--xlators/cluster/afr/src/afr-self-heal-entry.c29
1 files changed, 29 insertions, 0 deletions
diff --git a/xlators/cluster/afr/src/afr-self-heal-entry.c b/xlators/cluster/afr/src/afr-self-heal-entry.c
index 3598f79d..db17052c 100644
--- a/xlators/cluster/afr/src/afr-self-heal-entry.c
+++ b/xlators/cluster/afr/src/afr-self-heal-entry.c
@@ -1256,6 +1256,35 @@ afr_sh_entry_impunge_mknod (call_frame_t *impunge_frame, xlator_t *this,
gf_log (this->name, GF_LOG_INFO, "%s: gfid set failed",
impunge_local->loc.path);
+ /*
+ * Reason for adding GLUSTERFS_INTERNAL_FOP_KEY :
+ *
+ * Problem:
+ * While a brick is down in a replica pair, lets say the user creates
+ * one file(file-A) and a hard link to that file(h-file-A). After the
+ * brick comes back up, entry self-heal is attempted on parent dir of
+ * these two files. As part of readdir in self-heal it reads both the
+ * entries file-A and h-file-A for both of them it does name less lookup
+ * to check if there are any hardlinks already present in the
+ * destination brick. It finds that there are no hard links already
+ * present for files file-A, h-file-A. Self-heal does mknods for both
+ * file-A and h-file-A. This leads to file-A and h-file-A not being
+ * hardlinks anymore.
+ *
+ * Fix: (More like shrinking of race-window, the race itself is still
+ * present in posix-mknod).
+ * If mknod comes with the presence of GLUSTERFS_INTERNAL_FOP_KEY then
+ * posix_mknod checks if there are already any gfid-links and does
+ * link() instead of mknod. There still can be a race where two
+ * posix_mknods same gfid see that
+ * gfid-link file is not present and proceeds with mknods and result in
+ * two different files with same gfid.
+ */
+ ret = dict_set_str (dict, GLUSTERFS_INTERNAL_FOP_KEY, "yes");
+ if (ret)
+ gf_log (this->name, GF_LOG_INFO, "%s: %s set failed",
+ impunge_local->loc.path, GLUSTERFS_INTERNAL_FOP_KEY);
+
STACK_WIND_COOKIE (impunge_frame, afr_sh_entry_impunge_newfile_cbk,
(void *) (long) child_index,
priv->children[child_index],