btrfs: reada: Use fs_info instead of root in __readahead_hook's argument

What __readahead_hook() need exactly is fs_info, no need to convert
fs_info to root in caller and convert back in __readahead_hook()

Signed-off-by: Zhao Lei <zhaolei@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>

1 files changed, 11 insertions, 11 deletions

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 4545e2e2ad45..498156ede32c 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -612,6 +612,7 @@ static int btree_readpage_end_io_hook(struct btrfs_io_bio *io_bio,
         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;
         int ret = 0;
         int reads_done;
 
@@ -637,21 +638,21 @@ static int btree_readpage_end_io_hook(struct btrfs_io_bio *io_bio,
 
         found_start = btrfs_header_bytenr(eb);
         if (found_start != eb->start) {
-                btrfs_err_rl(eb->fs_info, "bad tree block start %llu %llu",
-                               found_start, eb->start);
+                btrfs_err_rl(fs_info, "bad tree block start %llu %llu",
+                             found_start, eb->start);
                 ret = -EIO;
                 goto err;
         }
-        if (check_tree_block_fsid(root->fs_info, eb)) {
-                btrfs_err_rl(eb->fs_info, "bad fsid on block %llu",
-                               eb->start);
+        if (check_tree_block_fsid(fs_info, eb)) {
+                btrfs_err_rl(fs_info, "bad fsid on block %llu",
+                             eb->start);
                 ret = -EIO;
                 goto err;
         }
         found_level = btrfs_header_level(eb);
         if (found_level >= BTRFS_MAX_LEVEL) {
-                btrfs_err(root->fs_info, "bad tree block level %d",
-                           (int)btrfs_header_level(eb));
+                btrfs_err(fs_info, "bad tree block level %d",
+                          (int)btrfs_header_level(eb));
                 ret = -EIO;
                 goto err;
         }
@@ -659,7 +660,7 @@ static int btree_readpage_end_io_hook(struct btrfs_io_bio *io_bio,
         btrfs_set_buffer_lockdep_class(btrfs_header_owner(eb),
                                        eb, found_level);
 
-        ret = csum_tree_block(root->fs_info, eb, 1);
+        ret = csum_tree_block(fs_info, eb, 1);
         if (ret) {
                 ret = -EIO;
                 goto err;
@@ -680,7 +681,7 @@ static int btree_readpage_end_io_hook(struct btrfs_io_bio *io_bio,
 err:
         if (reads_done &&
             test_and_clear_bit(EXTENT_BUFFER_READAHEAD, &eb->bflags))
-                btree_readahead_hook(root, eb, eb->start, ret);
+                btree_readahead_hook(fs_info, eb, eb->start, ret);
 
         if (ret) {
                 /*
@@ -699,14 +700,13 @@ out:
 static int btree_io_failed_hook(struct page *page, int failed_mirror)
 {
         struct extent_buffer *eb;
-        struct btrfs_root *root = BTRFS_I(page->mapping->host)->root;
 
         eb = (struct extent_buffer *)page->private;
         set_bit(EXTENT_BUFFER_READ_ERR, &eb->bflags);
         eb->read_mirror = failed_mirror;
         atomic_dec(&eb->io_pages);
         if (test_and_clear_bit(EXTENT_BUFFER_READAHEAD, &eb->bflags))
-                btree_readahead_hook(root, eb, eb->start, -EIO);
+                btree_readahead_hook(eb->fs_info, eb, eb->start, -EIO);
         return -EIO;    /* we fixed nothing */
 }