From: Chao Yu chao@kernel.org
[ Upstream commit fd244524c2cf07b5f4c3fe8abd6a99225c76544b ]
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") Reviewed-by: Daeho Jeong daehojeong@google.com Signed-off-by: Chao Yu chao@kernel.org Signed-off-by: Jaegeuk Kim jaegeuk@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- fs/f2fs/compress.c | 27 ++++++++++++++++++--------- fs/f2fs/data.c | 3 ++- 2 files changed, 20 insertions(+), 10 deletions(-)
diff --git a/fs/f2fs/compress.c b/fs/f2fs/compress.c index dfc59a658836f..100353355213d 100644 --- a/fs/f2fs/compress.c +++ b/fs/f2fs/compress.c @@ -1438,12 +1438,14 @@ 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; - int _submitted, compr_blocks, ret, i; + struct f2fs_sb_info *sbi = F2FS_M_SB(mapping); + int submitted, compr_blocks, i; + int ret = 0;
compr_blocks = f2fs_compressed_blocks(cc);
@@ -1458,6 +1460,10 @@ 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; @@ -1482,7 +1488,7 @@ 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) { @@ -1490,26 +1496,29 @@ 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; + *submitted_p += 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 349c9559f0b36..6f673fc44bdbc 100644 --- a/fs/f2fs/data.c +++ b/fs/f2fs/data.c @@ -2848,7 +2848,7 @@ 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, @@ -2932,6 +2932,7 @@ 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); }