From 1c33e31e80f0df42c2a994cfd0a1e654d28d8d2a Mon Sep 17 00:00:00 2001 From: Naohiro Aota Date: Tue, 8 Aug 2023 01:12:34 +0900 Subject: [PATCH] btrfs: zoned: defer advancing meta write pointer [ Upstream commit 0356ad41e0ddb8cf0ea4d68820c92598413e445b ] We currently advance the meta_write_pointer in btrfs_check_meta_write_pointer(). That makes it necessary to revert it when locking the buffer failed. Instead, we can advance it just before sending the buffer. Also, this is necessary for the following commit. In the commit, it needs to release the zoned_meta_io_lock to allow IOs to come in and wait for them to fill the currently active block group. If we advance the meta_write_pointer before locking the extent buffer, the following extent buffer can pass the meta_write_pointer check, resulting in an unaligned write failure. Advancing the pointer is still thread-safe as the extent buffer is locked. Reviewed-by: Christoph Hellwig Reviewed-by: Johannes Thumshirn Signed-off-by: Naohiro Aota Reviewed-by: David Sterba Signed-off-by: David Sterba Stable-dep-of: 13bb483d32ab ("btrfs: zoned: activate metadata block group on write time") Signed-off-by: Sasha Levin --- fs/btrfs/extent_io.c | 7 +++---- fs/btrfs/zoned.c | 15 +-------------- fs/btrfs/zoned.h | 8 -------- 3 files changed, 4 insertions(+), 26 deletions(-) diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c index d4bac66cee53..2ebc982e8ecc 100644 --- a/fs/btrfs/extent_io.c +++ b/fs/btrfs/extent_io.c @@ -1927,15 +1927,14 @@ static int submit_eb_page(struct page *page, struct btrfs_eb_write_context *ctx) } if (!lock_extent_buffer_for_io(eb, wbc)) { - btrfs_revert_meta_write_pointer(ctx->zoned_bg, eb); free_extent_buffer(eb); return 0; } + /* Implies write in zoned mode. */ if (ctx->zoned_bg) { - /* - * Implies write in zoned mode. Mark the last eb in a block group. - */ + /* Mark the last eb in the block group. */ btrfs_schedule_zone_finish_bg(ctx->zoned_bg, eb); + ctx->zoned_bg->meta_write_pointer += eb->len; } write_one_eb(eb, wbc); free_extent_buffer(eb); diff --git a/fs/btrfs/zoned.c b/fs/btrfs/zoned.c index 6e406f1b0d21..cc117283d0c8 100644 --- a/fs/btrfs/zoned.c +++ b/fs/btrfs/zoned.c @@ -1792,11 +1792,8 @@ int btrfs_check_meta_write_pointer(struct btrfs_fs_info *fs_info, ctx->zoned_bg = block_group; } - if (block_group->meta_write_pointer == eb->start) { - block_group->meta_write_pointer = eb->start + eb->len; - + if (block_group->meta_write_pointer == eb->start) return 0; - } /* If for_sync, this hole will be filled with trasnsaction commit. */ if (wbc->sync_mode == WB_SYNC_ALL && !wbc->for_sync) @@ -1804,16 +1801,6 @@ int btrfs_check_meta_write_pointer(struct btrfs_fs_info *fs_info, return -EBUSY; } -void btrfs_revert_meta_write_pointer(struct btrfs_block_group *cache, - struct extent_buffer *eb) -{ - if (!btrfs_is_zoned(eb->fs_info) || !cache) - return; - - ASSERT(cache->meta_write_pointer == eb->start + eb->len); - cache->meta_write_pointer = eb->start; -} - int btrfs_zoned_issue_zeroout(struct btrfs_device *device, u64 physical, u64 length) { if (!btrfs_dev_is_sequential(device, physical)) diff --git a/fs/btrfs/zoned.h b/fs/btrfs/zoned.h index c0859d8be152..74ec37a25808 100644 --- a/fs/btrfs/zoned.h +++ b/fs/btrfs/zoned.h @@ -60,8 +60,6 @@ bool btrfs_use_zone_append(struct btrfs_bio *bbio); void btrfs_record_physical_zoned(struct btrfs_bio *bbio); int btrfs_check_meta_write_pointer(struct btrfs_fs_info *fs_info, struct btrfs_eb_write_context *ctx); -void btrfs_revert_meta_write_pointer(struct btrfs_block_group *cache, - struct extent_buffer *eb); int btrfs_zoned_issue_zeroout(struct btrfs_device *device, u64 physical, u64 length); int btrfs_sync_zone_write_pointer(struct btrfs_device *tgt_dev, u64 logical, u64 physical_start, u64 physical_pos); @@ -194,12 +192,6 @@ static inline int btrfs_check_meta_write_pointer(struct btrfs_fs_info *fs_info, return 0; } -static inline void btrfs_revert_meta_write_pointer( - struct btrfs_block_group *cache, - struct extent_buffer *eb) -{ -} - static inline int btrfs_zoned_issue_zeroout(struct btrfs_device *device, u64 physical, u64 length) {