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btrfs: use only inline_pages from extent buffer

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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>
This commit is contained in:
David Sterba 2013-02-28 14:54:18 +00:00 committed by Josef Bacik
parent c58aaad2ac
commit b8dae31388
2 changed files with 7 additions and 17 deletions
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21
fs/btrfs/extent_io.c
View File

@ -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;
}

3
fs/btrfs/extent_io.h
View File

@ -158,8 +158,7 @@ struct extent_buffer {
*/
wait_queue_head_t read_lock_wq;
wait_queue_head_t lock_wq;
struct page *inline_pages[INLINE_EXTENT_BUFFER_PAGES];
struct page **pages;
struct page *pages[INLINE_EXTENT_BUFFER_PAGES];
};
static inline void extent_set_compress_type(unsigned long *bio_flags,