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authorBrian Foster <bfoster@redhat.com>2013-05-23 12:19:42 -0400
committerAnand Avati <avati@redhat.com>2013-06-13 14:37:43 -0700
commit17f287172413dc04244781aa5302a0e4f10e2777 (patch)
tree2acfc7097c92de32b19e82140befd8dc9fb2dad2 /xlators/performance/open-behind/src/open-behind.c
parentd1ccc4e400728d90f2ef7904661f53deb7199123 (diff)
glusterfs: discard (hole punch) support
Add support for the DISCARD file operation. Discard punches a hole in a file in the provided range. Block de-allocation is implemented via fallocate() (as requested via fuse and passed on to the brick fs) but a separate fop is created within gluster to emphasize the fact that discard changes file data (the discarded region is replaced with zeroes) and must invalidate caches where appropriate. BUG: 963678 Change-Id: I34633a0bfff2187afeab4292a15f3cc9adf261af Signed-off-by: Brian Foster <bfoster@redhat.com> Reviewed-on: http://review.gluster.org/5090 Tested-by: Gluster Build System <jenkins@build.gluster.com> Reviewed-by: Anand Avati <avati@redhat.com>
Diffstat (limited to 'xlators/performance/open-behind/src/open-behind.c')
-rw-r--r--xlators/performance/open-behind/src/open-behind.c20
1 files changed, 20 insertions, 0 deletions
diff --git a/xlators/performance/open-behind/src/open-behind.c b/xlators/performance/open-behind/src/open-behind.c
index 5ac813132eb..26b684e888c 100644
--- a/xlators/performance/open-behind/src/open-behind.c
+++ b/xlators/performance/open-behind/src/open-behind.c
@@ -701,6 +701,25 @@ err:
}
int
+ob_discard(call_frame_t *frame, xlator_t *this, fd_t *fd, off_t offset,
+ size_t len, dict_t *xdata)
+{
+ call_stub_t *stub;
+
+ stub = fop_discard_stub(frame, default_discard_resume, fd, offset, len,
+ xdata);
+ if (!stub)
+ goto err;
+
+ open_and_resume(this, fd, stub);
+
+ return 0;
+err:
+ STACK_UNWIND_STRICT(discard, frame, -1, ENOMEM, NULL, NULL, NULL);
+ return 0;
+}
+
+int
ob_unlink (call_frame_t *frame, xlator_t *this, loc_t *loc, int xflags,
dict_t *xdata)
{
@@ -922,6 +941,7 @@ struct xlator_fops fops = {
.fxattrop = ob_fxattrop,
.fsetattr = ob_fsetattr,
.fallocate = ob_fallocate,
+ .discard = ob_discard,
.unlink = ob_unlink,
.rename = ob_rename,
.lk = ob_lk,