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btrfs: reduce pointer intdirections in btree_readpage_end_io_hook

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All we need to read is checksum size from fs_info superblock, and
fs_info is provided by extent buffer so we can get rid of the wild
pointer indirections from page/inode/root.

Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2019-11-28 16:15:04 +01:00
parent b79ce3dddd
commit 15b6e8a83e
1 changed files with 4 additions and 3 deletions
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7
fs/btrfs/disk-io.c
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@ -604,9 +604,8 @@ static int btree_readpage_end_io_hook(struct btrfs_io_bio *io_bio,
u64 found_start;
int found_level;
struct extent_buffer *eb;
struct btrfs_root *root = BTRFS_I(page->mapping->host)->root;
struct btrfs_fs_info *fs_info = root->fs_info;
u16 csum_size = btrfs_super_csum_size(fs_info->super_copy);
struct btrfs_fs_info *fs_info;
u16 csum_size;
int ret = 0;
u8 result[BTRFS_CSUM_SIZE];
int reads_done;
@ -615,6 +614,8 @@ static int btree_readpage_end_io_hook(struct btrfs_io_bio *io_bio,
goto out;
eb = (struct extent_buffer *)page->private;
fs_info = eb->fs_info;
csum_size = btrfs_super_csum_size(fs_info->super_copy);
/* the pending IO might have been the only thing that kept this buffer
* in memory. Make sure we have a ref for all this other checks