btrfs: opencode trivial compressed_bio_alloc, simplify error handling

compressed_bio_alloc is now a trivial wrapper around btrfs_bio_alloc, no
point keeping it. The error handling can be simplified, as we know
btrfs_bio_alloc will never fail.

Reviewed-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/compression.c b/fs/btrfs/compression.c
index ab04dd0..8879989 100644 (file)
--- a/fs/btrfs/compression.c
+++ b/fs/btrfs/compression.c
@@ -54,12 +54,6 @@ static inline int compressed_bio_size(struct btrfs_fs_info *fs_info,
                (DIV_ROUND_UP(disk_size, fs_info->sectorsize)) * csum_size;
 }
 
-static struct bio *compressed_bio_alloc(struct block_device *bdev,
-                                       u64 first_byte, gfp_t gfp_flags)
-{
-       return btrfs_bio_alloc(bdev, first_byte >> 9);
-}
-
 static int check_compressed_csum(struct btrfs_inode *inode,
                                 struct compressed_bio *cb,
                                 u64 disk_start)
@@ -312,11 +306,7 @@ int btrfs_submit_compressed_write(struct inode *inode, u64 start,
 
        bdev = fs_info->fs_devices->latest_bdev;
 
-       bio = compressed_bio_alloc(bdev, first_byte, GFP_NOFS);
-       if (!bio) {
-               kfree(cb);
-               return -ENOMEM;
-       }
+       bio = btrfs_bio_alloc(bdev, first_byte >> 9);
        bio_set_op_attrs(bio, REQ_OP_WRITE, 0);
        bio->bi_private = cb;
        bio->bi_end_io = end_compressed_bio_write;
@@ -363,8 +353,7 @@ int btrfs_submit_compressed_write(struct inode *inode, u64 start,
 
                        bio_put(bio);
 
-                       bio = compressed_bio_alloc(bdev, first_byte, GFP_NOFS);
-                       BUG_ON(!bio);
+                       bio = btrfs_bio_alloc(bdev, first_byte >> 9);
                        bio_set_op_attrs(bio, REQ_OP_WRITE, 0);
                        bio->bi_private = cb;
                        bio->bi_end_io = end_compressed_bio_write;
@@ -607,9 +596,7 @@ int btrfs_submit_compressed_read(struct inode *inode, struct bio *bio,
        /* include any pages we added in add_ra-bio_pages */
        cb->len = bio->bi_iter.bi_size;
 
-       comp_bio = compressed_bio_alloc(bdev, cur_disk_byte, GFP_NOFS);
-       if (!comp_bio)
-               goto fail2;
+       comp_bio = btrfs_bio_alloc(bdev, cur_disk_byte >> 9);
        bio_set_op_attrs (comp_bio, REQ_OP_READ, 0);
        comp_bio->bi_private = cb;
        comp_bio->bi_end_io = end_compressed_bio_read;
@@ -660,9 +647,7 @@ int btrfs_submit_compressed_read(struct inode *inode, struct bio *bio,
 
                        bio_put(comp_bio);
 
-                       comp_bio = compressed_bio_alloc(bdev, cur_disk_byte,
-                                                       GFP_NOFS);
-                       BUG_ON(!comp_bio);
+                       comp_bio = btrfs_bio_alloc(bdev, cur_disk_byte >> 9);
                        bio_set_op_attrs(comp_bio, REQ_OP_READ, 0);
                        comp_bio->bi_private = cb;
                        comp_bio->bi_end_io = end_compressed_bio_read;