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| author | David Sterba <dsterba@suse.cz> | 2013-02-28 14:54:18 +0000 |
|---|---|---|
| committer | Josef Bacik <jbacik@fusionio.com> | 2013-02-28 13:33:56 -0500 |
| commit | b8dae3138876080d4dd98cc438ff759338d632ef (patch) | |
| tree | 0b99ae05e9e656e158261a05f11c2a140124ac49 /fs/btrfs/extent_io.c | |
| parent | c58aaad2ac46f8dbce9ab7f7a7a3726e332a56ee (diff) | |
| download | lwn-b8dae3138876080d4dd98cc438ff759338d632ef.tar.gz lwn-b8dae3138876080d4dd98cc438ff759338d632ef.zip | |
btrfs: use only inline_pages from extent buffer
The nodesize is capped at 64k and there are enough pages preallocated in
extent_buffer::inline_pages. The fallback to kmalloc never happened
because even on the smallest page size considered (4k) inline_pages
covered the needs.
Signed-off-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Diffstat (limited to 'fs/btrfs/extent_io.c')
| -rw-r--r-- | fs/btrfs/extent_io.c | 21 |
1 files changed, 6 insertions, 15 deletions
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c index 597ab8966c80..0306665cb1d7 100644 --- a/fs/btrfs/extent_io.c +++ b/fs/btrfs/extent_io.c @@ -3981,8 +3981,6 @@ static void __free_extent_buffer(struct extent_buffer *eb) list_del(&eb->leak_list); spin_unlock_irqrestore(&leak_lock, flags); #endif - if (eb->pages && eb->pages != eb->inline_pages) - kfree(eb->pages); kmem_cache_free(extent_buffer_cache, eb); } @@ -4023,19 +4021,12 @@ static struct extent_buffer *__alloc_extent_buffer(struct extent_io_tree *tree, atomic_set(&eb->refs, 1); atomic_set(&eb->io_pages, 0); - if (len > MAX_INLINE_EXTENT_BUFFER_SIZE) { - struct page **pages; - int num_pages = (len + PAGE_CACHE_SIZE - 1) >> - PAGE_CACHE_SHIFT; - pages = kzalloc(num_pages, mask); - if (!pages) { - __free_extent_buffer(eb); - return NULL; - } - eb->pages = pages; - } else { - eb->pages = eb->inline_pages; - } + /* + * Sanity checks, currently the maximum is 64k covered by 16x 4k pages + */ + BUILD_BUG_ON(BTRFS_MAX_METADATA_BLOCKSIZE + > MAX_INLINE_EXTENT_BUFFER_SIZE); + BUG_ON(len > MAX_INLINE_EXTENT_BUFFER_SIZE); return eb; } |