[PATCH v2 1/3] btrfs: remove the unnecessary path parameter for scrub_raid56_parity()
From: Qu Wenruo <hidden>
Date: 2021-12-14 13:02:06
Subsystem:
btrfs file system, filesystems (vfs and infrastructure), the rest · Maintainers:
Chris Mason, David Sterba, Alexander Viro, Christian Brauner, Linus Torvalds
In function scrub_stripe() we allocated two btrfs_path, one @path for extent tree search and another @ppath for full stripe extent tree search for RAID56. This is totally uncessary, as the @ppath usage is completely inside scrub_raid56_parity(), thus we can move the path allocation into scrub_raid56_parity() completely. Signed-off-by: Qu Wenruo <redacted> --- fs/btrfs/scrub.c | 30 ++++++++++++++++-------------- 1 file changed, 16 insertions(+), 14 deletions(-)
diff --git a/fs/btrfs/scrub.c b/fs/btrfs/scrub.c
index 15a123e67108..41908f0c1e76 100644
--- a/fs/btrfs/scrub.c
+++ b/fs/btrfs/scrub.c@@ -2892,7 +2892,6 @@ static void scrub_parity_put(struct scrub_parity *sparity) static noinline_for_stack int scrub_raid56_parity(struct scrub_ctx *sctx, struct map_lookup *map, struct btrfs_device *sdev, - struct btrfs_path *path, u64 logic_start, u64 logic_end) {
@@ -2901,6 +2900,7 @@ static noinline_for_stack int scrub_raid56_parity(struct scrub_ctx *sctx, struct btrfs_root *csum_root; struct btrfs_extent_item *extent; struct btrfs_io_context *bioc = NULL; + struct btrfs_path *path; u64 flags; int ret; int slot;
@@ -2919,6 +2919,16 @@ static noinline_for_stack int scrub_raid56_parity(struct scrub_ctx *sctx, int extent_mirror_num; int stop_loop = 0; + path = btrfs_alloc_path(); + if (!path) { + spin_lock(&sctx->stat_lock); + sctx->stat.malloc_errors++; + spin_unlock(&sctx->stat_lock); + return -ENOMEM; + } + path->search_commit_root = 1; + path->skip_locking = 1; + ASSERT(map->stripe_len <= U32_MAX); nsectors = map->stripe_len >> fs_info->sectorsize_bits; bitmap_len = scrub_calc_parity_bitmap_len(nsectors);
@@ -2928,6 +2938,7 @@ static noinline_for_stack int scrub_raid56_parity(struct scrub_ctx *sctx, spin_lock(&sctx->stat_lock); sctx->stat.malloc_errors++; spin_unlock(&sctx->stat_lock); + btrfs_free_path(path); return -ENOMEM; }
@@ -3117,7 +3128,7 @@ static noinline_for_stack int scrub_raid56_parity(struct scrub_ctx *sctx, scrub_wr_submit(sctx); mutex_unlock(&sctx->wr_lock); - btrfs_release_path(path); + btrfs_free_path(path); return ret < 0 ? ret : 0; }
@@ -3167,7 +3178,7 @@ static noinline_for_stack int scrub_stripe(struct scrub_ctx *sctx, int num, u64 base, u64 length, struct btrfs_block_group *cache) { - struct btrfs_path *path, *ppath; + struct btrfs_path *path; struct btrfs_fs_info *fs_info = sctx->fs_info; struct btrfs_root *root; struct btrfs_root *csum_root;
@@ -3229,12 +3240,6 @@ static noinline_for_stack int scrub_stripe(struct scrub_ctx *sctx, if (!path) return -ENOMEM; - ppath = btrfs_alloc_path(); - if (!ppath) { - btrfs_free_path(path); - return -ENOMEM; - } - /* * work on commit root. The related disk blocks are static as * long as COW is applied. This means, it is save to rewrite
@@ -3243,8 +3248,6 @@ static noinline_for_stack int scrub_stripe(struct scrub_ctx *sctx, path->search_commit_root = 1; path->skip_locking = 1; - ppath->search_commit_root = 1; - ppath->skip_locking = 1; /* * trigger the readahead for extent tree csum tree and wait for * completion. During readahead, the scrub is officially paused
@@ -3347,7 +3350,7 @@ static noinline_for_stack int scrub_stripe(struct scrub_ctx *sctx, stripe_logical += base; stripe_end = stripe_logical + increment; ret = scrub_raid56_parity(sctx, map, scrub_dev, - ppath, stripe_logical, + stripe_logical, stripe_end); if (ret) goto out;
@@ -3518,7 +3521,7 @@ static noinline_for_stack int scrub_stripe(struct scrub_ctx *sctx, stripe_end = stripe_logical + increment; ret = scrub_raid56_parity(sctx, - map, scrub_dev, ppath, + map, scrub_dev, stripe_logical, stripe_end); if (ret)
@@ -3565,7 +3568,6 @@ static noinline_for_stack int scrub_stripe(struct scrub_ctx *sctx, blk_finish_plug(&plug); btrfs_free_path(path); - btrfs_free_path(ppath); if (sctx->is_dev_replace && ret >= 0) { int ret2;
--
2.34.1