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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/storage
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/storage')
-rw-r--r--xlators/storage/posix/src/posix.c90
1 files changed, 63 insertions, 27 deletions
diff --git a/xlators/storage/posix/src/posix.c b/xlators/storage/posix/src/posix.c
index 3688340..05101fd 100644
--- a/xlators/storage/posix/src/posix.c
+++ b/xlators/storage/posix/src/posix.c
@@ -562,16 +562,12 @@ out:
}
static int32_t
-_posix_fallocate(call_frame_t *frame, xlator_t *this, fd_t *fd, int32_t keep_size,
- off_t offset, size_t len, dict_t *xdata)
+posix_do_fallocate(call_frame_t *frame, xlator_t *this, fd_t *fd, int32_t flags,
+ off_t offset, size_t len, struct iatt *statpre,
+ struct iatt *statpost)
{
- int32_t op_ret = -1;
- int32_t op_errno = 0;
- struct iatt statpre = {0,};
- struct iatt statpost = {0,};
struct posix_fd *pfd = NULL;
int32_t ret = -1;
- int32_t flags = 0;
DECLARE_OLD_FS_ID_VAR;
@@ -583,48 +579,87 @@ _posix_fallocate(call_frame_t *frame, xlator_t *this, fd_t *fd, int32_t keep_siz
ret = posix_fd_ctx_get (fd, this, &pfd);
if (ret < 0) {
- op_errno = -ret;
gf_log (this->name, GF_LOG_DEBUG,
"pfd is NULL from fd=%p", fd);
goto out;
}
- op_ret = posix_fdstat (this, pfd->fd, &statpre);
- if (op_ret == -1) {
- op_errno = errno;
+ ret = posix_fdstat (this, pfd->fd, statpre);
+ if (ret == -1) {
+ ret = -errno;
gf_log (this->name, GF_LOG_ERROR,
"fallocate (fstat) failed on fd=%p: %s", fd,
- strerror (op_errno));
+ strerror (errno));
goto out;
}
- if (keep_size)
- flags = FALLOC_FL_KEEP_SIZE;
-
- op_ret = sys_fallocate(pfd->fd, flags, offset, len);
- if (op_ret == -1) {
- op_errno = errno;
+ ret = sys_fallocate(pfd->fd, flags, offset, len);
+ if (ret == -1) {
+ ret = -errno;
goto out;
}
- op_ret = posix_fdstat (this, pfd->fd, &statpost);
- if (op_ret == -1) {
- op_errno = errno;
+ ret = posix_fdstat (this, pfd->fd, statpost);
+ if (ret == -1) {
+ ret = -errno;
gf_log (this->name, GF_LOG_ERROR,
"fallocate (fstat) failed on fd=%p: %s", fd,
- strerror (op_errno));
+ strerror (errno));
goto out;
}
- op_ret = 0;
-
out:
SET_TO_OLD_FS_ID ();
- STACK_UNWIND_STRICT (fallocate, frame, op_ret, op_errno,
- &statpre, &statpost, NULL);
+ return ret;
+}
+
+static int32_t
+_posix_fallocate(call_frame_t *frame, xlator_t *this, fd_t *fd, int32_t keep_size,
+ off_t offset, size_t len, dict_t *xdata)
+{
+ int32_t ret;
+ int32_t flags = 0;
+ struct iatt statpre = {0,};
+ struct iatt statpost = {0,};
+
+ if (keep_size)
+ flags = FALLOC_FL_KEEP_SIZE;
+
+ ret = posix_do_fallocate(frame, this, fd, flags, offset, len,
+ &statpre, &statpost);
+ if (ret < 0)
+ goto err;
+
+ STACK_UNWIND_STRICT(fallocate, frame, 0, 0, &statpre, &statpost, NULL);
+ return 0;
+
+err:
+ STACK_UNWIND_STRICT(fallocate, frame, -1, -ret, NULL, NULL, NULL);
+ return 0;
+}
+
+static int32_t
+posix_discard(call_frame_t *frame, xlator_t *this, fd_t *fd, off_t offset,
+ size_t len, dict_t *xdata)
+{
+ int32_t ret;
+ int32_t flags = FALLOC_FL_KEEP_SIZE|FALLOC_FL_PUNCH_HOLE;
+ struct iatt statpre = {0,};
+ struct iatt statpost = {0,};
+
+ ret = posix_do_fallocate(frame, this, fd, flags, offset, len,
+ &statpre, &statpost);
+ if (ret < 0)
+ goto err;
+
+ STACK_UNWIND_STRICT(discard, frame, 0, 0, &statpre, &statpost, NULL);
+ return 0;
+
+err:
+ STACK_UNWIND_STRICT(discard, frame, -1, -ret, NULL, NULL, NULL);
+ return 0;
- return 0;
}
int32_t
@@ -4726,6 +4761,7 @@ struct xlator_fops fops = {
.setattr = posix_setattr,
.fsetattr = posix_fsetattr,
.fallocate = _posix_fallocate,
+ .discard = posix_discard,
};
struct xlator_cbks cbks = {