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btrfs: scrub: remove the unnecessary path parameter for scrub_raid56_parity() 

In function scrub_stripe() we allocated two btrfs_path's, one @path for
extent tree search and another @ppath for full stripe extent tree search
for RAID56.

This is totally umncessary, 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 <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Qu Wenruo 2021-12-14 21:01:43 +08:00 committed by David Sterba
parent c122799643
commit 2522dbe86b
1 changed files with 16 additions and 14 deletions
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30
fs/btrfs/scrub.c
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@ -2885,7 +2885,6 @@ 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)
{
@ -2894,6 +2893,7 @@ 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;
@ -2912,6 +2912,16 @@ 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);
@ -2921,6 +2931,7 @@ 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;
}
@ -3110,7 +3121,7 @@ out:
scrub_wr_submit(sctx);
mutex_unlock(&sctx->wr_lock);
btrfs_release_path(path);
btrfs_free_path(path);
return ret < 0 ? ret : 0;
}
@ -3160,7 +3171,7 @@ 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;
@ -3222,12 +3233,6 @@ 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
@ -3236,8 +3241,6 @@ 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
@ -3340,7 +3343,7 @@ 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;
@ -3511,7 +3514,7 @@ loop:
stripe_end = stripe_logical +
increment;
ret = scrub_raid56_parity(sctx,
map, scrub_dev, ppath,
map, scrub_dev,
stripe_logical,
stripe_end);
if (ret)
@ -3558,7 +3561,6 @@ out:
blk_finish_plug(&plug);
btrfs_free_path(path);
btrfs_free_path(ppath);
if (sctx->is_dev_replace && ret >= 0) {
int ret2;