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| author | Chris Mason <chris.mason@oracle.com> | 2011-07-19 12:04:14 -0400 |
|---|---|---|
| committer | Chris Mason <chris.mason@oracle.com> | 2011-07-27 12:46:45 -0400 |
| commit | a65917156e345946dbde3d7effd28124c6d6a8c2 (patch) | |
| tree | dc5478189be0f6a321bfc23ee0545f71de67763b /fs/btrfs/disk-io.c | |
| parent | 199c36eaa95077a47ae1bc55532fc0fbeb80cc95 (diff) | |
| download | linux-3.10-a65917156e345946dbde3d7effd28124c6d6a8c2.tar.gz linux-3.10-a65917156e345946dbde3d7effd28124c6d6a8c2.tar.bz2 linux-3.10-a65917156e345946dbde3d7effd28124c6d6a8c2.zip | |
Btrfs: stop using highmem for extent_buffers
The extent_buffers have a very complex interface where
we use HIGHMEM for metadata and try to cache a kmap mapping
to access the memory.
The next commit adds reader/writer locks, and concurrent use
of this kmap cache would make it even more complex.
This commit drops the ability to use HIGHMEM with extent buffers,
and rips out all of the related code.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs/btrfs/disk-io.c')
| -rw-r--r-- | fs/btrfs/disk-io.c | 7 |
1 files changed, 2 insertions, 5 deletions
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index 234a08404fc..97f22ff8326 100644 --- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c @@ -217,7 +217,6 @@ static int csum_tree_block(struct btrfs_root *root, struct extent_buffer *buf, unsigned long len; unsigned long cur_len; unsigned long offset = BTRFS_CSUM_SIZE; - char *map_token = NULL; char *kaddr; unsigned long map_start; unsigned long map_len; @@ -228,8 +227,7 @@ static int csum_tree_block(struct btrfs_root *root, struct extent_buffer *buf, len = buf->len - offset; while (len > 0) { err = map_private_extent_buffer(buf, offset, 32, - &map_token, &kaddr, - &map_start, &map_len, KM_USER0); + &kaddr, &map_start, &map_len); if (err) return 1; cur_len = min(len, map_len - (offset - map_start)); @@ -237,7 +235,6 @@ static int csum_tree_block(struct btrfs_root *root, struct extent_buffer *buf, crc, cur_len); len -= cur_len; offset += cur_len; - unmap_extent_buffer(buf, map_token, KM_USER0); } if (csum_size > sizeof(inline_result)) { result = kzalloc(csum_size * sizeof(char), GFP_NOFS); @@ -1603,7 +1600,7 @@ struct btrfs_root *open_ctree(struct super_block *sb, goto fail_bdi; } - fs_info->btree_inode->i_mapping->flags &= ~__GFP_FS; + mapping_set_gfp_mask(fs_info->btree_inode->i_mapping, GFP_NOFS); INIT_RADIX_TREE(&fs_info->fs_roots_radix, GFP_ATOMIC); INIT_LIST_HEAD(&fs_info->trans_list); |