On 12/10, Chao Yu wrote:
> This patch adds i_size check during compress inode conversion in order
> to avoid .page_mkwrite races w/ conversion.
Which race condition do you see?
>
> Fixes: 4c8ff7095bef ("f2fs: support data compression")
> Signed-off-by: Chao Yu <c...@kernel.org>
> ---
> fs/f2fs/f2fs.h | 8 +++++++-
> fs/f2fs/file.c | 5 ++---
> 2 files changed, 9 insertions(+), 4 deletions(-)
>
> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> index 65294e3b0bef..c9b8a1953913 100644
> --- a/fs/f2fs/f2fs.h
> +++ b/fs/f2fs/f2fs.h
> @@ -4397,13 +4397,19 @@ static inline int set_compress_context(struct inode
> *inode)
> #endif
> }
>
> +static inline bool inode_has_data(struct inode *inode)
> +{
> + return (S_ISREG(inode->i_mode) &&
> + (F2FS_HAS_BLOCKS(inode) || i_size_read(inode)));
> +}
> +
> static inline bool f2fs_disable_compressed_file(struct inode *inode)
> {
> struct f2fs_inode_info *fi = F2FS_I(inode);
>
> if (!f2fs_compressed_file(inode))
> return true;
> - if (S_ISREG(inode->i_mode) && F2FS_HAS_BLOCKS(inode))
> + if (inode_has_data(inode))
> return false;
>
> fi->i_flags &= ~F2FS_COMPR_FL;
> diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
> index 1a3c29a9a6a0..8af4b29c3e1a 100644
> --- a/fs/f2fs/file.c
> +++ b/fs/f2fs/file.c
> @@ -1922,8 +1922,7 @@ static int f2fs_setflags_common(struct inode *inode,
> u32 iflags, u32 mask)
>
> f2fs_down_write(&F2FS_I(inode)->i_sem);
> if (!f2fs_may_compress(inode) ||
> - (S_ISREG(inode->i_mode) &&
> - F2FS_HAS_BLOCKS(inode))) {
> + inode_has_data(inode)) {
> f2fs_up_write(&F2FS_I(inode)->i_sem);
> return -EINVAL;
> }
> @@ -3996,7 +3995,7 @@ static int f2fs_ioc_set_compress_option(struct file
> *filp, unsigned long arg)
> goto out;
> }
>
> - if (F2FS_HAS_BLOCKS(inode)) {
> + if (inode_has_data(inode)) {
> ret = -EFBIG;
> goto out;
> }
> --
> 2.40.1
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