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btrfs: introduce btrfs_alloc_folio_array()

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The new helper will do the same thing as btrfs_alloc_page_array(), but
with folios.

One extra difference is, there is no extra helper for bulk allocation,
thus it may not be as efficient as the page version.

Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Qu Wenruo 2024-01-29 20:16:10 +10:30 committed by David Sterba
parent ae0d22a7fc
commit 11e03f2f4b
2 changed files with 33 additions and 0 deletions
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31
fs/btrfs/extent_io.c
View File

@ -666,6 +666,37 @@ static void end_bbio_data_read(struct btrfs_bio *bbio)
bio_put(bio);
}
/*
* Populate every free slot in a provided array with folios.
*
* @nr_folios: number of folios to allocate
* @folio_array: the array to fill with folios; any existing non-NULL entries in
* the array will be skipped
* @extra_gfp: the extra GFP flags for the allocation
*
* Return: 0 if all folios were able to be allocated;
* -ENOMEM otherwise, the partially allocated folios would be freed and
* the array slots zeroed
*/
int btrfs_alloc_folio_array(unsigned int nr_folios, struct folio **folio_array,
gfp_t extra_gfp)
{
for (int i = 0; i < nr_folios; i++) {
if (folio_array[i])
continue;
folio_array[i] = folio_alloc(GFP_NOFS | extra_gfp, 0);
if (!folio_array[i])
goto error;
}
return 0;
error:
for (int i = 0; i < nr_folios; i++) {
if (folio_array[i])
folio_put(folio_array[i]);
}
return -ENOMEM;
}
/*
* Populate every free slot in a provided array with pages.
*

2
fs/btrfs/extent_io.h
View File

@ -360,6 +360,8 @@ void btrfs_clear_buffer_dirty(struct btrfs_trans_handle *trans,
int btrfs_alloc_page_array(unsigned int nr_pages, struct page **page_array,
gfp_t extra_gfp);
int btrfs_alloc_folio_array(unsigned int nr_folios, struct folio **folio_array,
gfp_t extra_gfp);
#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
bool find_lock_delalloc_range(struct inode *inode,