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authorNiels de Vos <ndevos@redhat.com>2015-06-21 16:59:15 +0200
committerJeff Darcy <jdarcy@redhat.com>2016-02-10 04:38:25 -0800
commit4b725f2576b06a739e159981c6124118e26ccfbd (patch)
tree9d68096611c56d05a2a0187d815e18bf4de6df9b /xlators/storage/posix/src/posix.c
parent32935246bf884760800029cb20627ea94a865cee (diff)
posix: implement seek() FOP
The only lseek() options we need are SEEK_HOLE and SEEK_DATA. Change-Id: I5d15533c53fd710497f97c3cb4a8ea29fba47271 BUG: 1220173 Signed-off-by: Niels de Vos <ndevos@redhat.com> Reviewed-on: http://review.gluster.org/11484 Smoke: Gluster Build System <jenkins@build.gluster.com> Reviewed-by: Kaleb KEITHLEY <kkeithle@redhat.com> NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org> CentOS-regression: Gluster Build System <jenkins@build.gluster.com> Reviewed-by: Jeff Darcy <jdarcy@redhat.com>
Diffstat (limited to 'xlators/storage/posix/src/posix.c')
-rw-r--r--xlators/storage/posix/src/posix.c65
1 files changed, 65 insertions, 0 deletions
diff --git a/xlators/storage/posix/src/posix.c b/xlators/storage/posix/src/posix.c
index b0c23716a64..8f2296f0a17 100644
--- a/xlators/storage/posix/src/posix.c
+++ b/xlators/storage/posix/src/posix.c
@@ -9,6 +9,11 @@
*/
#define __XOPEN_SOURCE 500
+/* for SEEK_HOLE and SEEK_DATA */
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE
+#endif
+
#include <openssl/md5.h>
#include <stdint.h>
#include <sys/time.h>
@@ -20,6 +25,7 @@
#include <sys/stat.h>
#include <signal.h>
#include <sys/uio.h>
+#include <unistd.h>
#ifndef GF_BSD_HOST_OS
#include <alloca.h>
@@ -973,6 +979,62 @@ posix_ipc (call_frame_t *frame, xlator_t *this, int32_t op, dict_t *xdata)
}
+#ifdef HAVE_SEEK_HOLE
+static int32_t
+posix_seek (call_frame_t *frame, xlator_t *this, fd_t *fd, off_t offset,
+ gf_seek_what_t what, dict_t *xdata)
+{
+ struct posix_fd *pfd = NULL;
+ off_t ret = -1;
+ int err = 0;
+ int whence = 0;
+
+ DECLARE_OLD_FS_ID_VAR;
+
+ SET_FS_ID (frame->root->uid, frame->root->gid);
+
+ VALIDATE_OR_GOTO (frame, out);
+ VALIDATE_OR_GOTO (this, out);
+ VALIDATE_OR_GOTO (fd, out);
+
+ switch (what) {
+ case GF_SEEK_DATA:
+ whence = SEEK_DATA;
+ break;
+ case GF_SEEK_HOLE:
+ whence = SEEK_HOLE;
+ break;
+ default:
+ err = ENOTSUP;
+ gf_msg (this->name, GF_LOG_ERROR, ENOTSUP,
+ P_MSG_SEEK_UNKOWN, "don't know what to seek");
+ goto out;
+ }
+
+ ret = posix_fd_ctx_get (fd, this, &pfd);
+ if (ret < 0) {
+ gf_msg_debug (this->name, 0, "pfd is NULL from fd=%p", fd);
+ goto out;
+ }
+
+ ret = lseek (pfd->fd, offset, whence);
+ if (ret == -1) {
+ err = errno;
+ gf_msg (this->name, GF_LOG_ERROR, err, P_MSG_SEEK_FAILED,
+ "seek failed on fd %d length %" PRId64 , pfd->fd,
+ offset);
+ goto out;
+ }
+
+out:
+ SET_TO_OLD_FS_ID ();
+
+ STACK_UNWIND_STRICT (seek, frame, (ret == -1 ? -1 : 0), err,
+ (ret == -1 ? -1 : ret), xdata);
+ return 0;
+}
+#endif
+
int32_t
posix_opendir (call_frame_t *frame, xlator_t *this,
loc_t *loc, fd_t *fd, dict_t *xdata)
@@ -6998,6 +7060,9 @@ struct xlator_fops fops = {
.discard = posix_discard,
.zerofill = posix_zerofill,
.ipc = posix_ipc,
+#ifdef HAVE_SEEK_HOLE
+ .seek = posix_seek,
+#endif
};
struct xlator_cbks cbks = {