f2fs: support bio allocation error injection

This patch adds to support bio allocation error injection to simulate
out-of-memory test scenario.

Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index acb5317..b0781ed 100644 (file)
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -173,7 +173,7 @@ static struct bio *__bio_alloc(struct f2fs_sb_info *sbi, block_t blk_addr,
 {
        struct bio *bio;
 
-       bio = f2fs_bio_alloc(npages);
+       bio = f2fs_bio_alloc(sbi, npages, true);
 
        f2fs_target_device(sbi, blk_addr, bio);
        bio->bi_end_io = is_read ? f2fs_read_end_io : f2fs_write_end_io;
@@ -473,7 +473,7 @@ static struct bio *f2fs_grab_read_bio(struct inode *inode, block_t blkaddr,
                f2fs_wait_on_block_writeback(sbi, blkaddr);
        }
 
-       bio = bio_alloc(GFP_KERNEL, min_t(int, nr_pages, BIO_MAX_PAGES));
+       bio = f2fs_bio_alloc(sbi, min_t(int, nr_pages, BIO_MAX_PAGES), false);
        if (!bio) {
                if (ctx)
                        fscrypt_release_ctx(ctx);

diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 7ef3193..d89728c 100644 (file)
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -47,6 +47,7 @@ enum {
        FAULT_KMALLOC,
        FAULT_PAGE_ALLOC,
        FAULT_PAGE_GET,
+       FAULT_ALLOC_BIO,
        FAULT_ALLOC_NID,
        FAULT_ORPHAN,
        FAULT_BLOCK,
@@ -1898,15 +1899,25 @@ static inline void *f2fs_kmem_cache_alloc(struct kmem_cache *cachep,
        return entry;
 }
 
-static inline struct bio *f2fs_bio_alloc(int npages)
+static inline struct bio *f2fs_bio_alloc(struct f2fs_sb_info *sbi,
+                                               int npages, bool no_fail)
 {
        struct bio *bio;
 
-       /* No failure on bio allocation */
-       bio = bio_alloc(GFP_NOIO, npages);
-       if (!bio)
-               bio = bio_alloc(GFP_NOIO | __GFP_NOFAIL, npages);
-       return bio;
+       if (no_fail) {
+               /* No failure on bio allocation */
+               bio = bio_alloc(GFP_NOIO, npages);
+               if (!bio)
+                       bio = bio_alloc(GFP_NOIO | __GFP_NOFAIL, npages);
+               return bio;
+       }
+#ifdef CONFIG_F2FS_FAULT_INJECTION
+       if (time_to_inject(sbi, FAULT_ALLOC_BIO)) {
+               f2fs_show_injection_info(FAULT_ALLOC_BIO);
+               return NULL;
+       }
+#endif
+       return bio_alloc(GFP_KERNEL, npages);
 }
 
 static inline void f2fs_radix_tree_insert(struct radix_tree_root *root,

diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 46dfbca..5c3293a 100644 (file)
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -511,7 +511,7 @@ void f2fs_balance_fs_bg(struct f2fs_sb_info *sbi)
 static int __submit_flush_wait(struct f2fs_sb_info *sbi,
                                struct block_device *bdev)
 {
-       struct bio *bio = f2fs_bio_alloc(0);
+       struct bio *bio = f2fs_bio_alloc(sbi, 0, true);
        int ret;
 
        bio->bi_opf = REQ_OP_WRITE | REQ_SYNC | REQ_PREFLUSH;

diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 4a5af83..96e145c 100644 (file)
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -45,6 +45,7 @@ char *fault_name[FAULT_MAX] = {
        [FAULT_KMALLOC]         = "kmalloc",
        [FAULT_PAGE_ALLOC]      = "page alloc",
        [FAULT_PAGE_GET]        = "page get",
+       [FAULT_ALLOC_BIO]       = "alloc bio",
        [FAULT_ALLOC_NID]       = "alloc nid",
        [FAULT_ORPHAN]          = "orphan",
        [FAULT_BLOCK]           = "no more block",