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authorNick Piggin <npiggin@suse.de>2007-10-16 01:24:58 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-16 09:42:54 -0700
commit4a9e5ef1f4f15205e477817a5cefc34bd3f65f55 (patch)
tree51f52086ecbccc3f41955d8d12293ef7a566a05b /mm/filemap.c
parenteb2be189317d031895b5ca534fbf735eb546158b (diff)
mm: write iovec cleanup
Hide some of the open-coded nr_segs tests into the iovec helpers. This is all to simplify generic_file_buffered_write, because that gets more complex in the next patch. Signed-off-by: Nick Piggin <npiggin@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/filemap.c')
-rw-r--r--mm/filemap.c36
1 files changed, 10 insertions, 26 deletions
diff --git a/mm/filemap.c b/mm/filemap.c
index fb4c1c0792e..c59d5b3cd99 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -1823,12 +1823,7 @@ generic_file_buffered_write(struct kiocb *iocb, const struct iovec *iov,
/*
* handle partial DIO write. Adjust cur_iov if needed.
*/
- if (likely(nr_segs == 1))
- buf = iov->iov_base + written;
- else {
- filemap_set_next_iovec(&cur_iov, &iov_offset, written);
- buf = cur_iov->iov_base + iov_offset;
- }
+ filemap_set_next_iovec(&cur_iov, nr_segs, &iov_offset, written);
do {
struct page *page;
@@ -1838,6 +1833,7 @@ generic_file_buffered_write(struct kiocb *iocb, const struct iovec *iov,
size_t bytes; /* Bytes to write to page */
size_t copied; /* Bytes copied from user */
+ buf = cur_iov->iov_base + iov_offset;
offset = (pos & (PAGE_CACHE_SIZE - 1));
index = pos >> PAGE_CACHE_SHIFT;
bytes = PAGE_CACHE_SIZE - offset;
@@ -1869,13 +1865,10 @@ generic_file_buffered_write(struct kiocb *iocb, const struct iovec *iov,
if (unlikely(status))
goto fs_write_aop_error;
- if (likely(nr_segs == 1))
- copied = filemap_copy_from_user(page, offset,
- buf, bytes);
- else
- copied = filemap_copy_from_user_iovec(page, offset,
- cur_iov, iov_offset, bytes);
+ copied = filemap_copy_from_user(page, offset,
+ cur_iov, nr_segs, iov_offset, bytes);
flush_dcache_page(page);
+
status = a_ops->commit_write(file, page, offset, offset+bytes);
if (unlikely(status < 0 || status == AOP_TRUNCATED_PAGE))
goto fs_write_aop_error;
@@ -1886,20 +1879,11 @@ generic_file_buffered_write(struct kiocb *iocb, const struct iovec *iov,
if (unlikely(status > 0)) /* filesystem did partial write */
copied = status;
- if (likely(copied > 0)) {
- written += copied;
- count -= copied;
- pos += copied;
- buf += copied;
- if (unlikely(nr_segs > 1)) {
- filemap_set_next_iovec(&cur_iov,
- &iov_offset, copied);
- if (count)
- buf = cur_iov->iov_base + iov_offset;
- } else {
- iov_offset += copied;
- }
- }
+ written += copied;
+ count -= copied;
+ pos += copied;
+ filemap_set_next_iovec(&cur_iov, nr_segs, &iov_offset, copied);
+
unlock_page(page);
mark_page_accessed(page);
page_cache_release(page);