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Date: Fri, 12 Jan 2024 17:39:46 -0800
From: Jaegeuk Kim <jaegeuk@...nel.org>
To: Chao Yu <chao@...nel.org>
Cc: linux-f2fs-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 2/6] f2fs: compress: fix to cover normal cluster write
with cp_rwsem
Cleaned up a bit:
--- a/fs/f2fs/compress.c
+++ b/fs/f2fs/compress.c
@@ -1443,13 +1443,14 @@ void f2fs_compress_write_end_io(struct bio *bio, struct page *page)
}
static int f2fs_write_raw_pages(struct compress_ctx *cc,
- int *submitted,
+ int *submitted_p,
struct writeback_control *wbc,
enum iostat_type io_type)
{
struct address_space *mapping = cc->inode->i_mapping;
struct f2fs_sb_info *sbi = F2FS_M_SB(mapping);
- int _submitted, compr_blocks, ret = 0, i;
+ int submitted, compr_blocks, i;
+ int ret = 0;
compr_blocks = f2fs_compressed_blocks(cc);
@@ -1492,7 +1493,7 @@ static int f2fs_write_raw_pages(struct compress_ctx *cc,
if (!clear_page_dirty_for_io(cc->rpages[i]))
goto continue_unlock;
- ret = f2fs_write_single_data_page(cc->rpages[i], &_submitted,
+ ret = f2fs_write_single_data_page(cc->rpages[i], &submitted,
NULL, NULL, wbc, io_type,
compr_blocks, false);
if (ret) {
@@ -1514,7 +1515,7 @@ static int f2fs_write_raw_pages(struct compress_ctx *cc,
goto out;
}
- *submitted += _submitted;
+ *submitted_p += submitted;
}
out:
On 01/11, Chao Yu wrote:
> When we overwrite compressed cluster w/ normal cluster, we should
> not unlock cp_rwsem during f2fs_write_raw_pages(), otherwise data
> will be corrupted if partial blocks were persisted before CP & SPOR,
> due to cluster metadata wasn't updated atomically.
>
> Fixes: 4c8ff7095bef ("f2fs: support data compression")
> Signed-off-by: Chao Yu <chao@...nel.org>
> ---
> fs/f2fs/compress.c | 20 ++++++++++++++------
> fs/f2fs/data.c | 3 ++-
> 2 files changed, 16 insertions(+), 7 deletions(-)
>
> diff --git a/fs/f2fs/compress.c b/fs/f2fs/compress.c
> index 9940b7886e5d..bf4cfab67aec 100644
> --- a/fs/f2fs/compress.c
> +++ b/fs/f2fs/compress.c
> @@ -1448,7 +1448,8 @@ static int f2fs_write_raw_pages(struct compress_ctx *cc,
> enum iostat_type io_type)
> {
> struct address_space *mapping = cc->inode->i_mapping;
> - int _submitted, compr_blocks, ret, i;
> + struct f2fs_sb_info *sbi = F2FS_M_SB(mapping);
> + int _submitted, compr_blocks, ret = 0, i;
>
> compr_blocks = f2fs_compressed_blocks(cc);
>
> @@ -1463,6 +1464,10 @@ static int f2fs_write_raw_pages(struct compress_ctx *cc,
> if (compr_blocks < 0)
> return compr_blocks;
>
> + /* overwrite compressed cluster w/ normal cluster */
> + if (compr_blocks > 0)
> + f2fs_lock_op(sbi);
> +
> for (i = 0; i < cc->cluster_size; i++) {
> if (!cc->rpages[i])
> continue;
> @@ -1495,26 +1500,29 @@ static int f2fs_write_raw_pages(struct compress_ctx *cc,
> unlock_page(cc->rpages[i]);
> ret = 0;
> } else if (ret == -EAGAIN) {
> + ret = 0;
> /*
> * for quota file, just redirty left pages to
> * avoid deadlock caused by cluster update race
> * from foreground operation.
> */
> if (IS_NOQUOTA(cc->inode))
> - return 0;
> - ret = 0;
> + goto out;
> f2fs_io_schedule_timeout(DEFAULT_IO_TIMEOUT);
> goto retry_write;
> }
> - return ret;
> + goto out;
> }
>
> *submitted += _submitted;
> }
>
> - f2fs_balance_fs(F2FS_M_SB(mapping), true);
> +out:
> + if (compr_blocks > 0)
> + f2fs_unlock_op(sbi);
>
> - return 0;
> + f2fs_balance_fs(sbi, true);
> + return ret;
> }
>
> int f2fs_write_multi_pages(struct compress_ctx *cc,
> diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
> index 81f9e2cc49e2..b171a9980f6a 100644
> --- a/fs/f2fs/data.c
> +++ b/fs/f2fs/data.c
> @@ -2839,7 +2839,7 @@ int f2fs_write_single_data_page(struct page *page, int *submitted,
> .encrypted_page = NULL,
> .submitted = 0,
> .compr_blocks = compr_blocks,
> - .need_lock = LOCK_RETRY,
> + .need_lock = compr_blocks ? LOCK_DONE : LOCK_RETRY,
> .post_read = f2fs_post_read_required(inode) ? 1 : 0,
> .io_type = io_type,
> .io_wbc = wbc,
> @@ -2920,6 +2920,7 @@ int f2fs_write_single_data_page(struct page *page, int *submitted,
> if (err == -EAGAIN) {
> err = f2fs_do_write_data_page(&fio);
> if (err == -EAGAIN) {
> + f2fs_bug_on(sbi, compr_blocks);
> fio.need_lock = LOCK_REQ;
> err = f2fs_do_write_data_page(&fio);
> }
> --
> 2.40.1
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