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authorStephan von Krawczynski <skraw@ithnet.com>2009-09-14 05:59:55 +0000
committerAnand V. Avati <avati@dev.gluster.com>2009-09-15 05:36:16 -0700
commit0141bbb5c7b154affb1210d4f92e9ffab14596c7 (patch)
tree57e950a5866803e9c04845a5242eac3292cc24c8 /xlators/performance/io-cache/src/io-cache.c
parentef8ea2672c14ae19b0ae421cf53a701f89f4f192 (diff)
2.0.6 patch for io-cache pattern-matched non-caching
Hello all, here is a small feature patch. Its intention is to give the user more control over the files performance/io-cache really caches. If the user knows exactly which files should be cached and which shouldn't there is currently no way to tell glusterfs _not_ to cache certain pattern. This patch allows you to disable caching by setting the priority of a pattern to "0". If you do not give any priority option it works just like before and caches everything. Honestly I am not totally sure that disabling caching works the way we did it, please comment. Signed-off-by: Anand V. Avati <avati@dev.gluster.com> BUG: 261 (support for disabling caching of certain files) URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=261
Diffstat (limited to 'xlators/performance/io-cache/src/io-cache.c')
-rw-r--r--xlators/performance/io-cache/src/io-cache.c28
1 files changed, 23 insertions, 5 deletions
diff --git a/xlators/performance/io-cache/src/io-cache.c b/xlators/performance/io-cache/src/io-cache.c
index bab479b..ab8fa18 100644
--- a/xlators/performance/io-cache/src/io-cache.c
+++ b/xlators/performance/io-cache/src/io-cache.c
@@ -553,9 +553,14 @@ ioc_get_priority (ioc_table_t *table, const char *path)
uint32_t priority = 0;
struct ioc_priority *curr = NULL;
- list_for_each_entry (curr, &table->priority_list, list) {
- if (is_match (path, curr->pattern))
- priority = curr->priority;
+ if (list_empty(&table->priority_list)) {
+ priority = 1;
+ }
+ else {
+ list_for_each_entry (curr, &table->priority_list, list) {
+ if (is_match (path, curr->pattern))
+ priority = curr->priority;
+ }
}
return priority;
@@ -581,7 +586,7 @@ ioc_open_cbk (call_frame_t *frame, void *cookie, xlator_t *this, int32_t op_ret,
ioc_table_t *table = NULL;
ioc_inode_t *ioc_inode = NULL;
inode_t *inode = NULL;
- uint32_t weight = 0;
+ uint32_t weight = 0xffffffff;
const char *path = NULL;
local = frame->local;
@@ -633,6 +638,13 @@ ioc_open_cbk (call_frame_t *frame, void *cookie, xlator_t *this, int32_t op_ret,
*/
fd_ctx_set (fd, this, 1);
}
+
+ /* weight = 0, we disable caching on it */
+ if (weight == 0) {
+ /* we allow a pattern-matched cache disable this way
+ */
+ fd_ctx_set (fd, this, 1);
+ }
}
FREE (local);
@@ -664,7 +676,7 @@ ioc_create_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
ioc_local_t *local = NULL;
ioc_table_t *table = NULL;
ioc_inode_t *ioc_inode = NULL;
- uint32_t weight = 0;
+ uint32_t weight = 0xffffffff;
const char *path = NULL;
local = frame->local;
@@ -699,6 +711,12 @@ ioc_create_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
fd_ctx_set (fd, this, 1);
}
+ /* weight = 0, we disable caching on it */
+ if (weight == 0) {
+ /* we allow a pattern-matched cache disable this way
+ */
+ fd_ctx_set (fd, this, 1);
+ }
}
frame->local = NULL;