From af1ab7266edf91216e27484c505c78401f092e13 Mon Sep 17 00:00:00 2001 From: Krutika Dhananjay Date: Tue, 7 Jun 2016 16:27:34 +0530 Subject: libglusterfs: Implement API that provides page-aligned iobufs Backport of: http://review.gluster.org/14672 One of the consumers of a page aligned buffer would be posix's readv fop on O_DIRECT fds. Today the way it works is by getting a page-aligned buffer through calloc, pread()ing into this buffer and then copying its contents into a newly created iobuf's ptr. This results in an extra memcpy() which can be avoided if we could implement an api that would return an iobuf whose ptr is page-aligned. That way the iobuf->ptr can be directly passed to sys_pread() as a parameter by posix translator. Change-Id: Ie44c300dc773fef8e1669d609987d47dbd340ac2 BUG: 1351024 Signed-off-by: Krutika Dhananjay Reviewed-on: http://review.gluster.org/14826 Smoke: Gluster Build System NetBSD-regression: NetBSD Build System CentOS-regression: Gluster Build System Reviewed-by: Zhou Zhengping Reviewed-by: Pranith Kumar Karampuri --- xlators/storage/posix/src/posix.c | 43 ++++++++++----------------------------- 1 file changed, 11 insertions(+), 32 deletions(-) (limited to 'xlators/storage') diff --git a/xlators/storage/posix/src/posix.c b/xlators/storage/posix/src/posix.c index 7290905807b..836e90614f1 100644 --- a/xlators/storage/posix/src/posix.c +++ b/xlators/storage/posix/src/posix.c @@ -2985,8 +2985,6 @@ posix_readv (call_frame_t *frame, xlator_t *this, int32_t op_ret = -1; int32_t op_errno = 0; int _fd = -1; - char *buf = NULL; - char *alloc_buf = NULL; struct posix_private * priv = NULL; struct iobuf * iobuf = NULL; struct iobref * iobref = NULL; @@ -3018,42 +3016,24 @@ posix_readv (call_frame_t *frame, xlator_t *this, goto out; } - iobuf = iobuf_get2 (this->ctx->iobuf_pool, size); + iobuf = iobuf_get_page_aligned (this->ctx->iobuf_pool, size, + ALIGN_SIZE); if (!iobuf) { op_errno = ENOMEM; goto out; } _fd = pfd->fd; - if (pfd->flags & O_DIRECT) { - alloc_buf = _page_aligned_alloc (size, &buf); - if (!alloc_buf) { - op_ret = -1; - op_errno = errno; - goto out; - } - op_ret = pread (_fd, buf, size, offset); - if (op_ret == -1) { - op_errno = errno; - gf_msg (this->name, GF_LOG_ERROR, errno, - P_MSG_READ_FAILED, "read failed on gfid=%s, " - "fd=%p, offset=%"PRIu64" size=%"GF_PRI_SIZET", " - "buf=%p", uuid_utoa (fd->inode->gfid), fd, - offset, size, buf); - goto out; - } - memcpy(iobuf->ptr, buf, size); - } else { - op_ret = pread (_fd, iobuf->ptr, size, offset); - if (op_ret == -1) { - op_errno = errno; - gf_msg (this->name, GF_LOG_ERROR, errno, P_MSG_READ_FAILED, - "read failed on gfid=%s, fd=%p, offset=%"PRIu64" " - "size=%"GF_PRI_SIZET"", uuid_utoa (fd->inode->gfid), fd, - offset, size); - goto out; - } + op_ret = pread (_fd, iobuf->ptr, size, offset); + if (op_ret == -1) { + op_errno = errno; + gf_msg (this->name, GF_LOG_ERROR, errno, + P_MSG_READ_FAILED, "read failed on gfid=%s, " + "fd=%p, offset=%"PRIu64" size=%"GF_PRI_SIZET", " + "buf=%p", uuid_utoa (fd->inode->gfid), fd, + offset, size, iobuf->ptr); + goto out; } LOCK (&priv->lock); @@ -3096,7 +3076,6 @@ out: iobref_unref (iobref); if (iobuf) iobuf_unref (iobuf); - GF_FREE (alloc_buf); return 0; } -- cgit