Commit af75a621 authored Nov 05, 2017 by Chao Yu Committed by Jaegeuk Kim Dec 18, 2017

f2fs: keep isize once block is reserved cross EOF



Without FADVISE_KEEP_SIZE_BIT, we will try to recover file size
according to last non-hole block, so in fallocate(), we must set
FADVISE_KEEP_SIZE_BIT flag once we have preallocated block cross
EOF, instead of when all preallocation is success. Otherwise, file
size will be incorrect due to lack of this flag.

Simple testcase to reproduce this:

1. echo 2 > /sys/fs/f2fs/<device>/inject_type
2. echo 10 > /sys/fs/f2fs/<device>/inject_rate
3. run tests/generic/392
4. disable fault injection
5. do remount

Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

parent 3b96799d

fs/f2fs/file.c

+6 −4

Original line number	Diff line number	Diff line
		@@ -1473,8 +1473,12 @@ static int expand_inode_data(struct inode *inode, loff_t offset,
		new_size = ((loff_t)pg_end << PAGE_SHIFT) + off_end;
		}

		if (!(mode & FALLOC_FL_KEEP_SIZE) && i_size_read(inode) < new_size)
		if (new_size > i_size_read(inode)) {
		if (mode & FALLOC_FL_KEEP_SIZE)
		file_set_keep_isize(inode);
		else
		f2fs_i_size_write(inode, new_size);
		}

		return err;
		}
		@@ -1521,8 +1525,6 @@ static long f2fs_fallocate(struct file *file, int mode,
		if (!ret) {
		inode->i_mtime = inode->i_ctime = current_time(inode);
		f2fs_mark_inode_dirty_sync(inode, false);
		if (mode & FALLOC_FL_KEEP_SIZE)
		file_set_keep_isize(inode);
		f2fs_update_time(F2FS_I_SB(inode), REQ_TIME);
		}