diff options
| author | Jeff Darcy <jdarcy@redhat.com> | 2015-04-28 04:40:00 -0400 |
|---|---|---|
| committer | Vijay Bellur <vbellur@redhat.com> | 2015-05-09 06:28:13 -0700 |
| commit | c085871e3919df2b309b76633e75d5449899437a (patch) | |
| tree | 798d6c1438e4a4fd17187d188bf4cf4bf0ac6a54 /api/src/glfs.c | |
| parent | 4a15d32643fe149764239eabcf6ba53eb32faf63 (diff) | |
core: use reference counting for mem_acct structures
When freeing memory, our memory-accounting code expects to be able to
dereference from the (previously) allocated block to its owning
translator. However, as we have already found once in option
validation and twice in logging, that translator might itself have
been freed and the dereference attempt causes on of our daemons to
crash with SIGSEGV. This patch attempts to fix that as follows:
* We no longer embed a struct mem_acct directly in a struct xlator,
but instead allocate it separately.
* Allocated memory blocks now contain a pointer to the mem_acct
instead of the xlator.
* The mem_acct structure contains a reference count, manipulated in
both the normal and translator allocate/free code using atomic
increments and decrements.
* Because it's now a separate structure, we can defer freeing the
mem_acct until its reference count reaches zero (either way).
* Some unit tests were disabled, because they embedded their own
copies of the implementation for what they were supposedly testing.
Life's too short to spend time fixing tests that seem designed to
impede progress by requiring a certain implementation as well as
behavior.
Change-Id: Id929b11387927136f78626901729296b6c0d0fd7
BUG: 1211749
Signed-off-by: Jeff Darcy <jdarcy@redhat.com>
Reviewed-on: http://review.gluster.org/10417
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Krishnan Parthasarathi <kparthas@redhat.com>
Reviewed-by: Niels de Vos <ndevos@redhat.com>
Reviewed-by: Pranith Kumar Karampuri <pkarampu@redhat.com>
Diffstat (limited to 'api/src/glfs.c')
| -rw-r--r-- | api/src/glfs.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/api/src/glfs.c b/api/src/glfs.c index d6a6fe9c850..897d3eab809 100644 --- a/api/src/glfs.c +++ b/api/src/glfs.c @@ -965,7 +965,7 @@ glusterfs_ctx_destroy (glusterfs_ctx_t *ctx) return 0; /* For all the graphs, crawl through the xlator_t structs and free - * all its members except for the mem_acct.rec member, + * all its members except for the mem_acct member, * as GF_FREE will be referencing it. */ list_for_each_entry_safe (trav_graph, tmp, &ctx->graphs, list) { |