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f2fs: truncate preallocated blocks in error case 

If write is failed, we must deallocate the blocks that we couldn't write.

Cc: stable@vger.kernel.org
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
zero-colors
Jaegeuk Kim 2018-03-30 17:58:13 -07:00
parent 235831d7dd
commit dc7a10ddee
1 changed files with 9 additions and 0 deletions
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9
fs/f2fs/file.c
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@ -2911,6 +2911,8 @@ static ssize_t f2fs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
ret = generic_write_checks(iocb, from);
if (ret > 0) {
bool preallocated = false;
size_t target_size = 0;
int err;
if (iov_iter_fault_in_readable(from, iov_iter_count(from)))
@ -2927,6 +2929,9 @@ static ssize_t f2fs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
}
} else {
preallocated = true;
target_size = iocb->ki_pos + iov_iter_count(from);
err = f2fs_preallocate_blocks(iocb, from);
if (err) {
clear_inode_flag(inode, FI_NO_PREALLOC);
@ -2939,6 +2944,10 @@ static ssize_t f2fs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
blk_finish_plug(&plug);
clear_inode_flag(inode, FI_NO_PREALLOC);
/* if we couldn't write data, we should deallocate blocks. */
if (preallocated && i_size_read(inode) < target_size)
f2fs_truncate(inode);
if (ret > 0)
f2fs_update_iostat(F2FS_I_SB(inode), APP_WRITE_IO, ret);
}