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fs/buffer.c: call __block_write_begin() if we have page 

If we have the appropriate page already, call __block_write_begin()
directly instead of releasing and regrabbing it inside of
block_write_begin().

Signed-off-by: Namhyung Kim <namhyung@gmail.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Namhyung Kim 2010-10-25 15:01:12 +09:00 committed by Al Viro
parent a3314a0ed3
commit 309f77ad9b
1 changed files with 4 additions and 5 deletions
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9
fs/buffer.c
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@ -2458,11 +2458,10 @@ int nobh_write_begin(struct address_space *mapping,
*fsdata = NULL;
if (page_has_buffers(page)) {
unlock_page(page);
page_cache_release(page);
*pagep = NULL;
return block_write_begin(mapping, pos, len, flags, pagep,
get_block);
ret = __block_write_begin(page, pos, len, get_block);
if (unlikely(ret))
goto out_release;
return ret;
}
if (PageMappedToDisk(page))