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authorJoseph Fernandes <josferna@redhat.com>2015-03-18 19:55:31 +0530
committerVijay Bellur <vbellur@redhat.com>2015-03-19 01:31:29 -0700
commitb4a0db5ee3b827268fe1aeeed32ad7d417460c50 (patch)
treed79b3182062aa5c1b50eee24b0866d47fa7824c3 /xlators/storage/posix/src/posix.c
parenta1755ee2765f3d1c9c26d51a49ad63d133932710 (diff)
Adding ChangeTimeRecorder(CTR) Xlator to GlusterFS
********************************************************************** ChangeTimeRecorder(CTR) Xlator | ********************************************************************** ChangeTimeRecorder(CTR) is server side xlator(translator) which sits just above posix xlator. The main role of this xlator is to record the access/write patterns on a file residing the brick. It records the read(only data) and write(data and metadata) times and also count on how many times a file is read or written. This xlator also captures the hard links to a file(as its required by data tiering to move files). CTR Xlator is the consumer of libgfdb. To Enable/Disable CTR Xlator: ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ gluster volume set <volume-name> features.ctr-enabled {on/off} To Enable/Disable Frequency Counter Recording in CTR Xlator: ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ gluster volume set <volume-name> features.record-counters {on/off} Change-Id: I5d3cf056af61ac8e3f8250321a27cb240a214ac2 BUG: 1194753 Signed-off-by: Joseph Fernandes <josferna@redhat.com> Reviewed-on: http://review.gluster.org/9935 Tested-by: Gluster Build System <jenkins@build.gluster.com> Reviewed-by: Vijay Bellur <vbellur@redhat.com>
Diffstat (limited to 'xlators/storage/posix/src/posix.c')
-rw-r--r--xlators/storage/posix/src/posix.c44
1 files changed, 43 insertions, 1 deletions
diff --git a/xlators/storage/posix/src/posix.c b/xlators/storage/posix/src/posix.c
index fc6ec99..8001f23 100644
--- a/xlators/storage/posix/src/posix.c
+++ b/xlators/storage/posix/src/posix.c
@@ -1485,8 +1485,10 @@ posix_unlink (call_frame_t *frame, xlator_t *this,
int32_t unlink_if_linkto = 0;
int32_t check_open_fd = 0;
int32_t skip_unlink = 0;
+ int32_t ctr_link_req = 0;
ssize_t xattr_size = -1;
int32_t is_dht_linkto_file = 0;
+ dict_t *unwind_dict = NULL;
DECLARE_OLD_FS_ID_VAR;
@@ -1618,13 +1620,53 @@ posix_unlink (call_frame_t *frame, xlator_t *this,
goto out;
}
+ /*
+ *
+ * Check if there is a CTR_REQUEST_LINK_COUNT_XDATA from CTR Xlator
+ *
+ * */
+ op_ret = dict_get_int32 (xdata, CTR_REQUEST_LINK_COUNT_XDATA,
+ &ctr_link_req);
+ if (op_ret) {
+ /*Since no request no response*/
+ op_ret = 0;
+ goto out;
+ }
+
+ /* Sending back inode link count to ctr_unlink(changetimerecoder xlator)
+ * via "CTR_RESPONSE_LINK_COUNT_XDATA" key using unwind_dict.
+ * CTR Xlator will clear all the records if the link count has become 1
+ * i.e this was the last hard link.
+ * */
+ unwind_dict = dict_new ();
+ /* Even if unwind_dict fails to alloc memory we will not mark the FOP
+ * unsuccessful
+ * because this dict is only used by CTR Xlator to clear
+ * all records if link count == 0*/
+ if (!unwind_dict) {
+ op_ret = 0;
+ gf_log (this->name, GF_LOG_WARNING,
+ "Failed to creating unwind_dict");
+ goto out;
+ }
+ /* Even if unwind_dict fails to set CTR_RESPONSE_LINK_COUNT_XDATA we will
+ * not mark the FOP unsuccessful
+ * because this dict is only used by CTR Xlator to clear
+ * all records if link count == 0*/
+ op_ret = dict_set_uint32 (unwind_dict, CTR_RESPONSE_LINK_COUNT_XDATA,
+ stbuf.ia_nlink);
+ if (op_ret == -1) {
+ gf_log (this->name, GF_LOG_WARNING,
+ "Failed to set CTR_RESPONSE_LINK_COUNT_XDATA");
+ }
+
op_ret = 0;
out:
SET_TO_OLD_FS_ID ();
STACK_UNWIND_STRICT (unlink, frame, op_ret, op_errno,
- &preparent, &postparent, NULL);
+ &preparent, &postparent, unwind_dict);
if (fd != -1) {
close (fd);