From 17f287172413dc04244781aa5302a0e4f10e2777 Mon Sep 17 00:00:00 2001 From: Brian Foster Date: Thu, 23 May 2013 12:19:42 -0400 Subject: 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 Reviewed-on: http://review.gluster.org/5090 Tested-by: Gluster Build System Reviewed-by: Anand Avati --- xlators/performance/open-behind/src/open-behind.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) (limited to 'xlators/performance/open-behind') 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 @@ -700,6 +700,25 @@ err: return 0; } +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, -- cgit