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Diffstat (limited to 'fs/btrfs/extent_io.c')
-rw-r--r--fs/btrfs/extent_io.c35
1 files changed, 32 insertions, 3 deletions
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 4671c99d468d..910769d5fcdb 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -2886,6 +2886,35 @@ static void end_page_read(struct page *page, bool uptodate, u64 start, u32 len)
}
/*
+ * Find extent buffer for a givne bytenr.
+ *
+ * This is for end_bio_extent_readpage(), thus we can't do any unsafe locking
+ * in endio context.
+ */
+static struct extent_buffer *find_extent_buffer_readpage(
+ struct btrfs_fs_info *fs_info, struct page *page, u64 bytenr)
+{
+ struct extent_buffer *eb;
+
+ /*
+ * For regular sectorsize, we can use page->private to grab extent
+ * buffer
+ */
+ if (fs_info->sectorsize == PAGE_SIZE) {
+ ASSERT(PagePrivate(page) && page->private);
+ return (struct extent_buffer *)page->private;
+ }
+
+ /* For subpage case, we need to lookup buffer radix tree */
+ rcu_read_lock();
+ eb = radix_tree_lookup(&fs_info->buffer_radix,
+ bytenr >> fs_info->sectorsize_bits);
+ rcu_read_unlock();
+ ASSERT(eb);
+ return eb;
+}
+
+/*
* after a readpage IO is done, we need to:
* clear the uptodate bits on error
* set the uptodate bits if things worked
@@ -2996,7 +3025,7 @@ static void end_bio_extent_readpage(struct bio *bio)
} else {
struct extent_buffer *eb;
- eb = (struct extent_buffer *)page->private;
+ eb = find_extent_buffer_readpage(fs_info, page, start);
set_bit(EXTENT_BUFFER_READ_ERR, &eb->bflags);
eb->read_mirror = mirror;
atomic_dec(&eb->io_pages);
@@ -3020,7 +3049,7 @@ readpage_ok:
*/
if (page->index == end_index && i_size <= end) {
u32 zero_start = max(offset_in_page(i_size),
- offset_in_page(end));
+ offset_in_page(start));
zero_user_segment(page, zero_start,
offset_in_page(end) + 1);
@@ -3059,7 +3088,7 @@ struct bio *btrfs_bio_alloc(u64 first_byte)
{
struct bio *bio;
- bio = bio_alloc_bioset(GFP_NOFS, BIO_MAX_PAGES, &btrfs_bioset);
+ bio = bio_alloc_bioset(GFP_NOFS, BIO_MAX_VECS, &btrfs_bioset);
bio->bi_iter.bi_sector = first_byte >> 9;
btrfs_io_bio_init(btrfs_io_bio(bio));
return bio;