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authorXavi Hernandez <xhernandez@redhat.com>2019-05-31 18:40:30 +0200
committerAmar Tumballi <amarts@redhat.com>2019-06-11 13:28:07 +0000
commit952cf7e4f4393fcd9cf8c16b013d8f28915c990e (patch)
treecb1285e9e8fde551d2e01cfb8b8ac3233b65cb19 /xlators/performance
parentc525fdc6bd79684da196e0fe7ca5630c1bac8f21 (diff)
libglusterfs: cleanup iovec functions
This patch cleans some iovec code and creates two additional helper functions to simplify management of iovec structures. iov_range_copy(struct iovec *dst, uint32_t dst_count, uint32_t dst_offset, struct iovec *src, uint32_t src_count, uint32_t src_offset, uint32_t size); This function copies up to 'size' bytes from 'src' at offset 'src_offset' to 'dst' at 'dst_offset'. It returns the number of bytes copied. iov_skip(struct iovec *iovec, uint32_t count, uint32_t size); This function removes the initial 'size' bytes from 'iovec' and returns the updated number of iovec vectors remaining. The signature of iov_subset() has also been modified to make it safer and easier to use. The new signature is: iov_subset(struct iovec *src, int src_count, uint32_t start, uint32_t size, struct iovec **dst, int32_t dst_count); This function creates a new iovec array containing the subset of the 'src' vector starting at 'start' with size 'size'. The resulting array is allocated if '*dst' is NULL, or copied to '*dst' if it fits (based on 'dst_count'). It returns the number of iovec vectors used. A new set of functions to iterate through an iovec array have been created. They can be used to simplify the implementation of other iovec-based helper functions. Change-Id: Ia5fe57e388e23392a8d6cdab17670e337cadd587 Updates: bz#1193929 Signed-off-by: Xavi Hernandez <xhernandez@redhat.com>
Diffstat (limited to 'xlators/performance')
-rw-r--r--xlators/performance/io-cache/src/io-cache.c20
-rw-r--r--xlators/performance/io-cache/src/page.c10
-rw-r--r--xlators/performance/read-ahead/src/page.c10
-rw-r--r--xlators/performance/write-behind/src/write-behind.c3
4 files changed, 8 insertions, 35 deletions
diff --git a/xlators/performance/io-cache/src/io-cache.c b/xlators/performance/io-cache/src/io-cache.c
index 95ba2e1..711afdf 100644
--- a/xlators/performance/io-cache/src/io-cache.c
+++ b/xlators/performance/io-cache/src/io-cache.c
@@ -87,14 +87,6 @@ ioc_update_pages(call_frame_t *frame, ioc_inode_t *ioc_inode,
write_offset = 0;
off_t page_offset = 0, page_end = 0;
ioc_page_t *trav = NULL;
- struct iovec pagevector =
- {
- 0,
- },
- writevector = {
- 0,
- };
- int pvcount = 0, wvcount;
size = iov_length(vector, count);
size = min(size, op_ret);
@@ -120,16 +112,8 @@ ioc_update_pages(call_frame_t *frame, ioc_inode_t *ioc_inode,
page_end = trav->size;
}
- wvcount = iov_subset(vector, count, write_offset,
- write_offset + (page_end - page_offset),
- &writevector);
- if (wvcount) {
- pvcount = iov_subset(trav->vector, trav->count, page_offset,
- page_end, &pagevector);
- if (pvcount) {
- iov_copy(&pagevector, pvcount, &writevector, wvcount);
- }
- }
+ iov_range_copy(trav->vector, trav->count, page_offset, vector,
+ count, write_offset, page_end - page_offset);
} else if (trav) {
if (!trav->waitq)
ioc_inode->table->cache_used -= __ioc_page_destroy(trav);
diff --git a/xlators/performance/io-cache/src/page.c b/xlators/performance/io-cache/src/page.c
index 4a9679c..69b4fc0 100644
--- a/xlators/performance/io-cache/src/page.c
+++ b/xlators/performance/io-cache/src/page.c
@@ -727,11 +727,8 @@ __ioc_frame_fill(ioc_page_t *page, call_frame_t *frame, off_t offset,
new->size = copy_size;
new->iobref = iobref_ref(page->iobref);
new->count = iov_subset(page->vector, page->count, src_offset,
- src_offset + copy_size, NULL);
-
- new->vector = GF_CALLOC(new->count, sizeof(struct iovec),
- gf_ioc_mt_iovec);
- if (new->vector == NULL) {
+ copy_size, &new->vector, 0);
+ if (new->count < 0) {
local->op_ret = -1;
local->op_errno = ENOMEM;
@@ -740,9 +737,6 @@ __ioc_frame_fill(ioc_page_t *page, call_frame_t *frame, off_t offset,
goto out;
}
- new->count = iov_subset(page->vector, page->count, src_offset,
- src_offset + copy_size, new->vector);
-
/* add the ioc_fill to fill_list for this frame */
if (list_empty(&local->fill_list)) {
/* if list is empty, then this is the first
diff --git a/xlators/performance/read-ahead/src/page.c b/xlators/performance/read-ahead/src/page.c
index 3440263..8a58ad8 100644
--- a/xlators/performance/read-ahead/src/page.c
+++ b/xlators/performance/read-ahead/src/page.c
@@ -347,19 +347,15 @@ ra_frame_fill(ra_page_t *page, call_frame_t *frame)
new->size = copy_size;
new->iobref = iobref_ref(page->iobref);
new->count = iov_subset(page->vector, page->count, src_offset,
- src_offset + copy_size, NULL);
- new->vector = GF_CALLOC(new->count, sizeof(struct iovec),
- gf_ra_mt_iovec);
- if (new->vector == NULL) {
+ copy_size, &new->vector, 0);
+ if (new->count < 0) {
local->op_ret = -1;
local->op_errno = ENOMEM;
+ iobref_unref(new->iobref);
GF_FREE(new);
goto out;
}
- new->count = iov_subset(page->vector, page->count, src_offset,
- src_offset + copy_size, new->vector);
-
new->next = fill;
new->prev = new->next->prev;
new->next->prev = new;
diff --git a/xlators/performance/write-behind/src/write-behind.c b/xlators/performance/write-behind/src/write-behind.c
index 70e281a..aade1c9 100644
--- a/xlators/performance/write-behind/src/write-behind.c
+++ b/xlators/performance/write-behind/src/write-behind.c
@@ -971,8 +971,7 @@ __wb_modify_write_request(wb_request_t *req, int synced_size)
vector = req->stub->args.vector;
count = req->stub->args.count;
- req->stub->args.count = iov_subset(vector, count, synced_size,
- iov_length(vector, count), vector);
+ req->stub->args.count = iov_skip(vector, count, synced_size);
out:
return;