From 14a56ec65bab351a3e1535882f15a6af21912cac Mon Sep 17 00:00:00 2001 From: Gao Xiang Date: Mon, 25 Mar 2019 11:40:09 +0800 Subject: [PATCH] staging: erofs: support IO read error injection Used to simulate disk IO read error for testing fatal error tolerance. Here are the details, 1) use bio->bi_private to indicate super_block for non-compressed bios since some (mainly meta) pages can be of the corresponding bdev inode; 2) get super_block dynamically for compressed bios, therefore it could not inject bios full of staging pages, yet it doesn't affect the normal usage. Signed-off-by: Gao Xiang Reviewed-by: Chao Yu Signed-off-by: Greg Kroah-Hartman --- .../erofs/Documentation/filesystems/erofs.txt | 1 + drivers/staging/erofs/data.c | 18 ++++++++++++------ drivers/staging/erofs/internal.h | 6 ++++-- drivers/staging/erofs/super.c | 3 ++- drivers/staging/erofs/unzip_vle.c | 14 +++++++++----- 5 files changed, 28 insertions(+), 14 deletions(-) diff --git a/drivers/staging/erofs/Documentation/filesystems/erofs.txt b/drivers/staging/erofs/Documentation/filesystems/erofs.txt index 961ec4da7705..74cf84ac48a3 100644 --- a/drivers/staging/erofs/Documentation/filesystems/erofs.txt +++ b/drivers/staging/erofs/Documentation/filesystems/erofs.txt @@ -60,6 +60,7 @@ fault_injection=%d Enable fault injection in all supported types with specified injection rate. Supported injection type: Type_Name Type_Value FAULT_KMALLOC 0x000000001 + FAULT_READ_IO 0x000000002 (no)user_xattr Setup Extended User Attributes. Note: xattr is enabled by default if CONFIG_EROFS_FS_XATTR is selected. (no)acl Setup POSIX Access Control List. Note: acl is enabled diff --git a/drivers/staging/erofs/data.c b/drivers/staging/erofs/data.c index 526e0dbea5b5..0714061ba888 100644 --- a/drivers/staging/erofs/data.c +++ b/drivers/staging/erofs/data.c @@ -17,11 +17,17 @@ static inline void read_endio(struct bio *bio) { + struct super_block *const sb = bio->bi_private; int i; struct bio_vec *bvec; - const blk_status_t err = bio->bi_status; + blk_status_t err = bio->bi_status; struct bvec_iter_all iter_all; + if (time_to_inject(EROFS_SB(sb), FAULT_READ_IO)) { + erofs_show_injection_info(FAULT_READ_IO); + err = BLK_STS_IOERR; + } + bio_for_each_segment_all(bvec, bio, i, iter_all) { struct page *page = bvec->bv_page; @@ -63,7 +69,7 @@ repeat: if (!PageUptodate(page)) { struct bio *bio; - bio = erofs_grab_bio(sb, blkaddr, 1, read_endio, nofail); + bio = erofs_grab_bio(sb, blkaddr, 1, sb, read_endio, nofail); if (IS_ERR(bio)) { DBG_BUGON(nofail); err = PTR_ERR(bio); @@ -188,7 +194,8 @@ static inline struct bio *erofs_read_raw_page(struct bio *bio, unsigned int nblocks, bool ra) { - struct inode *inode = mapping->host; + struct inode *const inode = mapping->host; + struct super_block *const sb = inode->i_sb; erofs_off_t current_block = (erofs_off_t)page->index; int err; @@ -280,9 +287,8 @@ submit_bio_retry: if (nblocks > BIO_MAX_PAGES) nblocks = BIO_MAX_PAGES; - bio = erofs_grab_bio(inode->i_sb, - blknr, nblocks, read_endio, false); - + bio = erofs_grab_bio(sb, blknr, nblocks, sb, + read_endio, false); if (IS_ERR(bio)) { err = PTR_ERR(bio); bio = NULL; diff --git a/drivers/staging/erofs/internal.h b/drivers/staging/erofs/internal.h index a66c7d495c35..c47778b3fabd 100644 --- a/drivers/staging/erofs/internal.h +++ b/drivers/staging/erofs/internal.h @@ -44,11 +44,12 @@ enum { FAULT_KMALLOC, + FAULT_READ_IO, FAULT_MAX, }; #ifdef CONFIG_EROFS_FAULT_INJECTION -extern char *erofs_fault_name[FAULT_MAX]; +extern const char *erofs_fault_name[FAULT_MAX]; #define IS_FAULT_SET(fi, type) ((fi)->inject_type & (1 << (type))) struct erofs_fault_info { @@ -467,7 +468,7 @@ static inline int z_erofs_map_blocks_iter(struct inode *inode, /* data.c */ static inline struct bio * erofs_grab_bio(struct super_block *sb, - erofs_blk_t blkaddr, unsigned int nr_pages, + erofs_blk_t blkaddr, unsigned int nr_pages, void *bi_private, bio_end_io_t endio, bool nofail) { const gfp_t gfp = GFP_NOIO; @@ -489,6 +490,7 @@ erofs_grab_bio(struct super_block *sb, bio->bi_end_io = endio; bio_set_dev(bio, sb->s_bdev); bio->bi_iter.bi_sector = (sector_t)blkaddr << LOG_SECTORS_PER_BLOCK; + bio->bi_private = bi_private; return bio; } diff --git a/drivers/staging/erofs/super.c b/drivers/staging/erofs/super.c index 7b460a3ca4d6..8bee0d3a161b 100644 --- a/drivers/staging/erofs/super.c +++ b/drivers/staging/erofs/super.c @@ -142,8 +142,9 @@ out: } #ifdef CONFIG_EROFS_FAULT_INJECTION -char *erofs_fault_name[FAULT_MAX] = { +const char *erofs_fault_name[FAULT_MAX] = { [FAULT_KMALLOC] = "kmalloc", + [FAULT_READ_IO] = "read IO error", }; static void __erofs_build_fault_attr(struct erofs_sb_info *sbi, diff --git a/drivers/staging/erofs/unzip_vle.c b/drivers/staging/erofs/unzip_vle.c index 8e720bb882c7..566835cf6f2f 100644 --- a/drivers/staging/erofs/unzip_vle.c +++ b/drivers/staging/erofs/unzip_vle.c @@ -844,8 +844,8 @@ static void z_erofs_vle_unzip_kickoff(void *ptr, int bios) static inline void z_erofs_vle_read_endio(struct bio *bio) { - const blk_status_t err = bio->bi_status; struct erofs_sb_info *sbi = NULL; + blk_status_t err = bio->bi_status; unsigned int i; struct bio_vec *bvec; struct bvec_iter_all iter_all; @@ -857,9 +857,15 @@ static inline void z_erofs_vle_read_endio(struct bio *bio) DBG_BUGON(PageUptodate(page)); DBG_BUGON(!page->mapping); - if (unlikely(!sbi && !z_erofs_is_stagingpage(page))) + if (unlikely(!sbi && !z_erofs_is_stagingpage(page))) { sbi = EROFS_SB(page->mapping->host->i_sb); + if (time_to_inject(sbi, FAULT_READ_IO)) { + erofs_show_injection_info(FAULT_READ_IO); + err = BLK_STS_IOERR; + } + } + /* sbi should already be gotten if the page is managed */ if (sbi) cachemngd = erofs_page_is_managed(sbi, page); @@ -1430,10 +1436,8 @@ submit_bio_retry: if (!bio) { bio = erofs_grab_bio(sb, first_index + i, - BIO_MAX_PAGES, + BIO_MAX_PAGES, bi_private, z_erofs_vle_read_endio, true); - bio->bi_private = bi_private; - ++nr_bios; } -- 2.30.2