On 2020/9/18 10:56, Eric Biggers wrote:
On Fri, Sep 18, 2020 at 09:47:32AM +0800, Chao Yu wrote:
Ah, I got it.
Step of enabling compressed inode is not correct, we should touch an empty
file, and then use 'chattr +c' on that file to enable compression, otherwise
the race condition could be complicated to handle. So we need below diff to
disallow setting compression flag on an non-empty file:
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index 8a422400e824..b462db7898fd 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -1836,6 +1836,8 @@ static int f2fs_setflags_common(struct inode *inode, u32
iflags, u32 mask)
if (iflags & F2FS_COMPR_FL) {
if (!f2fs_may_compress(inode))
return -EINVAL;
+ if (get_dirty_pages(inode) || fi->i_compr_blocks)
+ return -EINVAL;
set_compress_context(inode);
}
Why not:
if (inode->i_size)
return -EINVAL;
Yeah, I noticed that after replying this email, I've prepared the new patch
which including the i_size check.
Thanks for noticing this.
Thanks,
.
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