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| author | Jaegeuk Kim <jaegeuk@kernel.org> | 2017-01-14 00:12:29 +0300 |
|---|---|---|
| committer | Jaegeuk Kim <jaegeuk@kernel.org> | 2017-02-23 07:24:48 +0300 |
| commit | dc91de78e5e1d44238b5dd2b57d2e8e67cbc00a1 (patch) | |
| tree | d78cc69fe7a50db8a8c3207cb532eab76c051bfd /fs/f2fs/data.c | |
| parent | dcc9165dbf9961cf2848af728f8be31f28a3c790 (diff) | |
| download | linux-dc91de78e5e1d44238b5dd2b57d2e8e67cbc00a1.tar.xz | |
f2fs: do not preallocate blocks which has wrong buffer
Sheng Yong reports needless preallocation if write(small_buffer, large_size)
is called.
In that case, f2fs preallocates large_size, but vfs returns early due to
small_buffer size. Let's detect it before preallocation phase in f2fs.
Reported-by: Sheng Yong <shengyong1@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Diffstat (limited to 'fs/f2fs/data.c')
| -rw-r--r-- | fs/f2fs/data.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c index 848d110dc1ca..2ea80215f26c 100644 --- a/fs/f2fs/data.c +++ b/fs/f2fs/data.c @@ -749,6 +749,9 @@ int f2fs_preallocate_blocks(struct kiocb *iocb, struct iov_iter *from) struct f2fs_map_blocks map; int err = 0; + if (is_inode_flag_set(inode, FI_NO_PREALLOC)) + return 0; + map.m_lblk = F2FS_BLK_ALIGN(iocb->ki_pos); map.m_len = F2FS_BYTES_TO_BLK(iocb->ki_pos + iov_iter_count(from)); if (map.m_len > map.m_lblk) @@ -1653,7 +1656,8 @@ static int prepare_write_begin(struct f2fs_sb_info *sbi, * we already allocated all the blocks, so we don't need to get * the block addresses when there is no need to fill the page. */ - if (!f2fs_has_inline_data(inode) && len == PAGE_SIZE) + if (!f2fs_has_inline_data(inode) && len == PAGE_SIZE && + !is_inode_flag_set(inode, FI_NO_PREALLOC)) return 0; if (f2fs_has_inline_data(inode) || |