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btrfs: get rid of trivial __btrfs_lookup_bio_sums() wrappers 

Currently, we have two wrappers for __btrfs_lookup_bio_sums():
btrfs_lookup_bio_sums_dio(), which is used for direct I/O, and
btrfs_lookup_bio_sums(), which is used everywhere else. The only
difference is that the _dio variant looks up csums starting at the given
offset instead of using the page index, which isn't actually direct
I/O-specific. Let's clean up the signature and return value of
__btrfs_lookup_bio_sums(), rename it to btrfs_lookup_bio_sums(), and get
rid of the trivial helpers.

Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Omar Sandoval 2019-12-02 17:34:17 -08:00 committed by David Sterba
parent 321f69f86a
commit e62958fce9
4 changed files with 23 additions and 26 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
fs/btrfs/compression.c
View File

@ -763,7 +763,7 @@ blk_status_t btrfs_submit_compressed_read(struct inode *inode, struct bio *bio,
if (!(BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM)) {
ret = btrfs_lookup_bio_sums(inode, comp_bio,
sums);
false, 0, sums);
BUG_ON(ret); /* -ENOMEM */
}
@ -791,7 +791,7 @@ blk_status_t btrfs_submit_compressed_read(struct inode *inode, struct bio *bio,
BUG_ON(ret); /* -ENOMEM */
if (!(BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM)) {
ret = btrfs_lookup_bio_sums(inode, comp_bio, sums);
ret = btrfs_lookup_bio_sums(inode, comp_bio, false, 0, sums);
BUG_ON(ret); /* -ENOMEM */
}

4
fs/btrfs/ctree.h
View File

@ -2789,9 +2789,7 @@ struct btrfs_dio_private;
int btrfs_del_csums(struct btrfs_trans_handle *trans,
struct btrfs_root *root, u64 bytenr, u64 len);
blk_status_t btrfs_lookup_bio_sums(struct inode *inode, struct bio *bio,
u8 *dst);
blk_status_t btrfs_lookup_bio_sums_dio(struct inode *inode, struct bio *bio,
u64 logical_offset);
bool at_offset, u64 offset, u8 *dst);
int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
u64 objectid, u64 pos,

35
fs/btrfs/file-item.c
View File

@ -148,8 +148,21 @@ int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
return ret;
}
static blk_status_t __btrfs_lookup_bio_sums(struct inode *inode, struct bio *bio,
u64 logical_offset, u8 *dst, int dio)
/**
* btrfs_lookup_bio_sums - Look up checksums for a bio.
* @inode: inode that the bio is for.
* @bio: bio embedded in btrfs_io_bio.
* @at_offset: If true, look up checksums for the extent at @offset.
* If false, use the page offsets from the bio.
* @offset: If @at_offset is true, offset in file to look up checksums for.
* Ignored otherwise.
* @dst: Buffer of size btrfs_super_csum_size() used to return checksum. If
* NULL, the checksum is returned in btrfs_io_bio(bio)->csum instead.
*
* Return: BLK_STS_RESOURCE if allocating memory fails, BLK_STS_OK otherwise.
*/
blk_status_t btrfs_lookup_bio_sums(struct inode *inode, struct bio *bio,
bool at_offset, u64 offset, u8 *dst)
{
struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
struct bio_vec bvec;
@ -159,7 +172,6 @@ static blk_status_t __btrfs_lookup_bio_sums(struct inode *inode, struct bio *bio
struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
struct btrfs_path *path;
u8 *csum;
u64 offset = 0;
u64 item_start_offset = 0;
u64 item_last_offset = 0;
u64 disk_bytenr;
@ -205,15 +217,13 @@ static blk_status_t __btrfs_lookup_bio_sums(struct inode *inode, struct bio *bio
}
disk_bytenr = (u64)bio->bi_iter.bi_sector << 9;
if (dio)
offset = logical_offset;
bio_for_each_segment(bvec, bio, iter) {
page_bytes_left = bvec.bv_len;
if (count)
goto next;
if (!dio)
if (!at_offset)
offset = page_offset(bvec.bv_page) + bvec.bv_offset;
count = btrfs_find_ordered_sum(inode, offset, disk_bytenr,
csum, nblocks);
@ -285,18 +295,7 @@ next:
WARN_ON_ONCE(count);
btrfs_free_path(path);
return 0;
}
blk_status_t btrfs_lookup_bio_sums(struct inode *inode, struct bio *bio,
u8 *dst)
{
return __btrfs_lookup_bio_sums(inode, bio, 0, dst, 0);
}
blk_status_t btrfs_lookup_bio_sums_dio(struct inode *inode, struct bio *bio, u64 offset)
{
return __btrfs_lookup_bio_sums(inode, bio, offset, NULL, 1);
return BLK_STS_OK;
}
int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start, u64 end,

6
fs/btrfs/inode.c
View File

@ -2127,7 +2127,7 @@ static blk_status_t btrfs_submit_bio_hook(struct inode *inode, struct bio *bio,
bio_flags);
goto out;
} else if (!skip_sum) {
ret = btrfs_lookup_bio_sums(inode, bio, NULL);
ret = btrfs_lookup_bio_sums(inode, bio, false, 0, NULL);
if (ret)
goto out;
}
@ -8387,8 +8387,8 @@ static inline blk_status_t btrfs_lookup_and_bind_dio_csum(struct inode *inode,
* contention.
*/
if (dip->logical_offset == file_offset) {
ret = btrfs_lookup_bio_sums_dio(inode, dip->orig_bio,
file_offset);
ret = btrfs_lookup_bio_sums(inode, dip->orig_bio, true,
file_offset, NULL);
if (ret)
return ret;
}