btrfs: compression: remove dead comments in btrfs_compress_heuristic()

[linux-2.6-microblaze.git] / fs / btrfs / compression.c

diff --git a/fs/btrfs/compression.c b/fs/btrfs/compression.c
index 68345f7..b2b9400 100644 (file)
--- a/fs/btrfs/compression.c
+++ b/fs/btrfs/compression.c
@@ -25,8 +25,6 @@
 #include "misc.h"
 #include "ctree.h"
 #include "fs.h"
-#include "disk-io.h"
-#include "transaction.h"
 #include "btrfs_inode.h"
 #include "bio.h"
 #include "ordered-data.h"
@@ -34,8 +32,7 @@
 #include "extent_io.h"
 #include "extent_map.h"
 #include "subpage.h"
-#include "zoned.h"
-#include "file-item.h"
+#include "messages.h"
 #include "super.h"
 
 static struct bio_set btrfs_compressed_bioset;
@@ -284,7 +281,7 @@ static void end_bbio_comprssed_read(struct btrfs_bio *bbio)
 static noinline void end_compressed_writeback(const struct compressed_bio *cb)
 {
        struct inode *inode = &cb->bbio.inode->vfs_inode;
-       struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
+       struct btrfs_fs_info *fs_info = inode_to_fs_info(inode);
        unsigned long index = cb->start >> PAGE_SHIFT;
        unsigned long end_index = (cb->start + cb->len - 1) >> PAGE_SHIFT;
        struct folio_batch fbatch;
@@ -415,7 +412,7 @@ static noinline int add_ra_bio_pages(struct inode *inode,
                                     struct compressed_bio *cb,
                                     int *memstall, unsigned long *pflags)
 {
-       struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
+       struct btrfs_fs_info *fs_info = inode_to_fs_info(inode);
        unsigned long end_index;
        struct bio *orig_bio = &cb->orig_bbio->bio;
        u64 cur = cb->orig_bbio->file_offset + orig_bio->bi_iter.bi_size;
@@ -441,7 +438,7 @@ static noinline int add_ra_bio_pages(struct inode *inode,
         * This makes readahead less effective, so here disable readahead for
         * subpage for now, until full compressed write is supported.
         */
-       if (btrfs_sb(inode->i_sb)->sectorsize < PAGE_SIZE)
+       if (fs_info->sectorsize < PAGE_SIZE)
                return 0;
 
        end_index = (i_size_read(inode) - 1) >> PAGE_SHIFT;
@@ -1039,7 +1036,7 @@ static int btrfs_decompress_bio(struct compressed_bio *cb)
 int btrfs_decompress(int type, const u8 *data_in, struct page *dest_page,
                     unsigned long dest_pgoff, size_t srclen, size_t destlen)
 {
-       struct btrfs_fs_info *fs_info = btrfs_sb(dest_page->mapping->host->i_sb);
+       struct btrfs_fs_info *fs_info = page_to_fs_info(dest_page);
        struct list_head *workspace;
        const u32 sectorsize = fs_info->sectorsize;
        int ret;
@@ -1479,11 +1476,6 @@ static void heuristic_collect_sample(struct inode *inode, u64 start, u64 end,
 /*
  * Compression heuristic.
  *
- * For now is's a naive and optimistic 'return true', we'll extend the logic to
- * quickly (compared to direct compression) detect data characteristics
- * (compressible/incompressible) to avoid wasting CPU time on incompressible
- * data.
- *
  * The following types of analysis can be performed:
  * - detect mostly zero data
  * - detect data with low "byte set" size (text, etc)