f2fs: avoid allocating failure in bio_alloc

This patch add macro MAX_BIO_BLOCKS to limit value of npages in
f2fs_bio_alloc, it can avoid allocating failure in bio_alloc caused by
npages is larger than BIO_MAX_PAGES.

Signed-off-by: Yu Chao <chao2.yu@samsung.com>
Reviewed-by: Gu Zheng <guz.fnst@cn.fujitsu.com>
Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>

2 files changed, 5 insertions, 1 deletions

diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 09af9c7b0f52..bd79bbeceb1d 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -657,6 +657,7 @@ static void submit_write_page(struct f2fs_sb_info *sbi, struct page *page,
                                 block_t blk_addr, enum page_type type)
 {
         struct block_device *bdev = sbi->sb->s_bdev;
+        int bio_blocks;
 
         verify_block_addr(sbi, blk_addr);
 
@@ -676,7 +677,8 @@ retry:
                         goto retry;
                 }
 
-                sbi->bio[type] = f2fs_bio_alloc(bdev, max_hw_blocks(sbi));
+                bio_blocks = MAX_BIO_BLOCKS(max_hw_blocks(sbi));
+                sbi->bio[type] = f2fs_bio_alloc(bdev, bio_blocks);
                 sbi->bio[type]->bi_sector = SECTOR_FROM_BLOCK(sbi, blk_addr);
                 sbi->bio[type]->bi_private = priv;
                 /*
diff --git a/fs/f2fs/segment.h b/fs/f2fs/segment.h
index bdd10eab8c40..7f94d78cda3d 100644
--- a/fs/f2fs/segment.h
+++ b/fs/f2fs/segment.h
@@ -90,6 +90,8 @@
         (blk_addr << ((sbi)->log_blocksize - F2FS_LOG_SECTOR_SIZE))
 #define SECTOR_TO_BLOCK(sbi, sectors)                                   \
         (sectors >> ((sbi)->log_blocksize - F2FS_LOG_SECTOR_SIZE))
+#define MAX_BIO_BLOCKS(max_hw_blocks)                                   \
+        (min((int)max_hw_blocks, BIO_MAX_PAGES))
 
 /* during checkpoint, bio_private is used to synchronize the last bio */
 struct bio_private {