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author | David Sterba <dsterba@suse.cz> | 2014-06-15 01:20:26 (GMT) |
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committer | David Sterba <dsterba@suse.cz> | 2014-12-12 17:26:55 (GMT) |
commit | 3f556f7853ec4845a7c219d026cbcdf4cfa8cea7 (patch) | |
tree | cf3552bb4ed22bc7c46403549ca13043c40fe460 /fs/btrfs/extent_io.c | |
parent | 23d79d81b13431756fee428acde49c9b770da132 (diff) | |
download | linux-3f556f7853ec4845a7c219d026cbcdf4cfa8cea7.tar.xz |
btrfs: unify extent buffer allocation api
Make the extent buffer allocation interface consistent. Cloned eb will
set a valid fs_info. For dummy eb, we can drop the length parameter and
set it from fs_info.
The built-in sanity checks may pass a NULL fs_info that's queried for
nodesize, but we know it's 4096.
Signed-off-by: David Sterba <dsterba@suse.cz>
Diffstat (limited to 'fs/btrfs/extent_io.c')
-rw-r--r-- | fs/btrfs/extent_io.c | 23 |
1 files changed, 18 insertions, 5 deletions
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c index 619592d..dc424e3 100644 --- a/fs/btrfs/extent_io.c +++ b/fs/btrfs/extent_io.c @@ -4643,7 +4643,7 @@ struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src) struct extent_buffer *new; unsigned long num_pages = num_extent_pages(src->start, src->len); - new = __alloc_extent_buffer(NULL, src->start, src->len); + new = __alloc_extent_buffer(src->fs_info, src->start, src->len); if (new == NULL) return NULL; @@ -4666,13 +4666,26 @@ struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src) return new; } -struct extent_buffer *alloc_dummy_extent_buffer(u64 start, unsigned long len) +struct extent_buffer *alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info, + u64 start) { struct extent_buffer *eb; - unsigned long num_pages = num_extent_pages(0, len); + unsigned long len; + unsigned long num_pages; unsigned long i; - eb = __alloc_extent_buffer(NULL, start, len); + if (!fs_info) { + /* + * Called only from tests that don't always have a fs_info + * available, but we know that nodesize is 4096 + */ + len = 4096; + } else { + len = fs_info->tree_root->nodesize; + } + num_pages = num_extent_pages(0, len); + + eb = __alloc_extent_buffer(fs_info, start, len); if (!eb) return NULL; @@ -4770,7 +4783,7 @@ struct extent_buffer *alloc_test_extent_buffer(struct btrfs_fs_info *fs_info, eb = find_extent_buffer(fs_info, start); if (eb) return eb; - eb = alloc_dummy_extent_buffer(start, len); + eb = alloc_dummy_extent_buffer(fs_info, start); if (!eb) return NULL; eb->fs_info = fs_info; |