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f2fs: don't trigger read IO for beyond EOF page 

In f2fs_mpage_readpages(), if page is beyond EOF, we should just
zero out it, but previously, before checking previous mapping
info, we missed to check filesize boundary, fix it.

Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Chao Yu 2019-03-07 17:31:30 +08:00 committed by Jaegeuk Kim
parent 240a59156d
commit 86109c9064
1 changed files with 8 additions and 9 deletions
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17
fs/f2fs/data.c
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@ -1551,6 +1551,9 @@ static int f2fs_mpage_readpages(struct address_space *mapping,
if (last_block > last_block_in_file)
last_block = last_block_in_file;
/* just zeroing out page which is beyond EOF */
if (block_in_file >= last_block)
goto zero_out;
/*
* Map blocks using the previous result first.
*/
@ -1563,16 +1566,11 @@ static int f2fs_mpage_readpages(struct address_space *mapping,
* Then do more f2fs_map_blocks() calls until we are
* done with this page.
*/
map.m_flags = 0;
map.m_lblk = block_in_file;
map.m_len = last_block - block_in_file;
if (block_in_file < last_block) {
map.m_lblk = block_in_file;
map.m_len = last_block - block_in_file;
if (f2fs_map_blocks(inode, &map, 0,
F2FS_GET_BLOCK_DEFAULT))
goto set_error_page;
}
if (f2fs_map_blocks(inode, &map, 0, F2FS_GET_BLOCK_DEFAULT))
goto set_error_page;
got_it:
if ((map.m_flags & F2FS_MAP_MAPPED)) {
block_nr = map.m_pblk + block_in_file - map.m_lblk;
@ -1587,6 +1585,7 @@ got_it:
DATA_GENERIC))
goto set_error_page;
} else {
zero_out:
zero_user_segment(page, 0, PAGE_SIZE);
if (!PageUptodate(page))
SetPageUptodate(page);