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erofs: kill all erofs specific fault injection 

As Christoph suggested [1], "Please just use plain kmalloc
everywhere and let the normal kernel error injection code
take care of injeting any errors."

[1] https://lore.kernel.org/r/20190829102426.GE20598@infradead.org/
Reported-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
Link: https://lore.kernel.org/r/20190904020912.63925-20-gaoxiang25@huawei.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Gao Xiang 2019-09-04 10:09:06 +08:00 committed by Greg Kroah-Hartman
parent 99634bf388
commit e2c71e74b2
7 changed files with 2 additions and 163 deletions
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5
Documentation/filesystems/erofs.txt
View File

@ -52,11 +52,6 @@ linux-erofs mailing list:
Mount options
=============
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

7
fs/erofs/Kconfig
View File

@ -27,13 +27,6 @@ config EROFS_FS_DEBUG
For daily use, say N.
config EROFS_FAULT_INJECTION
bool "EROFS fault injection facility"
depends on EROFS_FS
help
Test EROFS to inject faults such as ENOMEM, EIO, and so on.
If unsure, say N.
config EROFS_FS_XATTR
bool "EROFS extended attributes"
depends on EROFS_FS

7
fs/erofs/data.c
View File

@ -11,16 +11,10 @@
static void erofs_readendio(struct bio *bio)
{
struct super_block *const sb = bio->bi_private;
struct bio_vec *bvec;
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, iter_all) {
struct page *page = bvec->bv_page;
@ -48,7 +42,6 @@ static struct bio *erofs_grab_raw_bio(struct super_block *sb,
bio->bi_end_io = erofs_readendio;
bio_set_dev(bio, sb->s_bdev);
bio->bi_iter.bi_sector = (sector_t)blkaddr << LOG_SECTORS_PER_BLOCK;
bio->bi_private = sb;
if (ismeta)
bio->bi_opf = REQ_OP_READ | REQ_META;
else

3
fs/erofs/inode.c
View File

@ -131,7 +131,6 @@ static int erofs_fill_symlink(struct inode *inode, void *data,
unsigned int m_pofs)
{
struct erofs_inode *vi = EROFS_I(inode);
struct erofs_sb_info *sbi = EROFS_I_SB(inode);
char *lnk;
/* if it cannot be handled with fast symlink scheme */
@ -141,7 +140,7 @@ static int erofs_fill_symlink(struct inode *inode, void *data,
return 0;
}
lnk = erofs_kmalloc(sbi, inode->i_size + 1, GFP_KERNEL);
lnk = kmalloc(inode->i_size + 1, GFP_KERNEL);
if (!lnk)
return -ENOMEM;

65
fs/erofs/internal.h
View File

@ -32,23 +32,6 @@
#define DBG_BUGON(x) ((void)(x))
#endif /* !CONFIG_EROFS_FS_DEBUG */
enum {
FAULT_KMALLOC,
FAULT_READ_IO,
FAULT_MAX,
};
#ifdef CONFIG_EROFS_FAULT_INJECTION
extern const char *erofs_fault_name[FAULT_MAX];
#define IS_FAULT_SET(fi, type) ((fi)->inject_type & (1 << (type)))
struct erofs_fault_info {
atomic_t inject_ops;
unsigned int inject_rate;
unsigned int inject_type;
};
#endif /* CONFIG_EROFS_FAULT_INJECTION */
/* EROFS_SUPER_MAGIC_V1 to represent the whole file system */
#define EROFS_SUPER_MAGIC EROFS_SUPER_MAGIC_V1
@ -99,62 +82,14 @@ struct erofs_sb_info {
u32 feature_incompat;
unsigned int mount_opt;
#ifdef CONFIG_EROFS_FAULT_INJECTION
struct erofs_fault_info fault_info; /* For fault injection */
#endif
};
#ifdef CONFIG_EROFS_FAULT_INJECTION
#define erofs_show_injection_info(type) \
infoln("inject %s in %s of %pS", erofs_fault_name[type], \
__func__, __builtin_return_address(0))
static inline bool time_to_inject(struct erofs_sb_info *sbi, int type)
{
struct erofs_fault_info *ffi = &sbi->fault_info;
if (!ffi->inject_rate)
return false;
if (!IS_FAULT_SET(ffi, type))
return false;
atomic_inc(&ffi->inject_ops);
if (atomic_read(&ffi->inject_ops) >= ffi->inject_rate) {
atomic_set(&ffi->inject_ops, 0);
return true;
}
return false;
}
#else
static inline bool time_to_inject(struct erofs_sb_info *sbi, int type)
{
return false;
}
static inline void erofs_show_injection_info(int type)
{
}
#endif /* !CONFIG_EROFS_FAULT_INJECTION */
static inline void *erofs_kmalloc(struct erofs_sb_info *sbi,
size_t size, gfp_t flags)
{
if (time_to_inject(sbi, FAULT_KMALLOC)) {
erofs_show_injection_info(FAULT_KMALLOC);
return NULL;
}
return kmalloc(size, flags);
}
#define EROFS_SB(sb) ((struct erofs_sb_info *)(sb)->s_fs_info)
#define EROFS_I_SB(inode) ((struct erofs_sb_info *)(inode)->i_sb->s_fs_info)
/* Mount flags set via mount options or defaults */
#define EROFS_MOUNT_XATTR_USER 0x00000010
#define EROFS_MOUNT_POSIX_ACL 0x00000020
#define EROFS_MOUNT_FAULT_INJECTION 0x00000040
#define clear_opt(sbi, option) ((sbi)->mount_opt &= ~EROFS_MOUNT_##option)
#define set_opt(sbi, option) ((sbi)->mount_opt |= EROFS_MOUNT_##option)

70
fs/erofs/super.c
View File

@ -126,63 +126,6 @@ out:
return ret;
}
#ifdef CONFIG_EROFS_FAULT_INJECTION
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,
unsigned int rate)
{
struct erofs_fault_info *ffi = &sbi->fault_info;
if (rate) {
atomic_set(&ffi->inject_ops, 0);
ffi->inject_rate = rate;
ffi->inject_type = (1 << FAULT_MAX) - 1;
} else {
memset(ffi, 0, sizeof(struct erofs_fault_info));
}
set_opt(sbi, FAULT_INJECTION);
}
static int erofs_build_fault_attr(struct erofs_sb_info *sbi,
substring_t *args)
{
int rate = 0;
if (args->from && match_int(args, &rate))
return -EINVAL;
__erofs_build_fault_attr(sbi, rate);
return 0;
}
static unsigned int erofs_get_fault_rate(struct erofs_sb_info *sbi)
{
return sbi->fault_info.inject_rate;
}
#else
static void __erofs_build_fault_attr(struct erofs_sb_info *sbi,
unsigned int rate)
{
}
static int erofs_build_fault_attr(struct erofs_sb_info *sbi,
substring_t *args)
{
infoln("fault_injection options not supported");
return 0;
}
static unsigned int erofs_get_fault_rate(struct erofs_sb_info *sbi)
{
return 0;
}
#endif
#ifdef CONFIG_EROFS_FS_ZIP
static int erofs_build_cache_strategy(struct erofs_sb_info *sbi,
substring_t *args)
@ -237,7 +180,6 @@ enum {
Opt_nouser_xattr,
Opt_acl,
Opt_noacl,
Opt_fault_injection,
Opt_cache_strategy,
Opt_err
};
@ -247,7 +189,6 @@ static match_table_t erofs_tokens = {
{Opt_nouser_xattr, "nouser_xattr"},
{Opt_acl, "acl"},
{Opt_noacl, "noacl"},
{Opt_fault_injection, "fault_injection=%u"},
{Opt_cache_strategy, "cache_strategy=%s"},
{Opt_err, NULL}
};
@ -301,11 +242,6 @@ static int erofs_parse_options(struct super_block *sb, char *options)
infoln("noacl options not supported");
break;
#endif
case Opt_fault_injection:
err = erofs_build_fault_attr(EROFS_SB(sb), args);
if (err)
return err;
break;
case Opt_cache_strategy:
err = erofs_build_cache_strategy(EROFS_SB(sb), args);
if (err)
@ -593,9 +529,6 @@ static int erofs_show_options(struct seq_file *seq, struct dentry *root)
else
seq_puts(seq, ",noacl");
#endif
if (test_opt(sbi, FAULT_INJECTION))
seq_printf(seq, ",fault_injection=%u",
erofs_get_fault_rate(sbi));
#ifdef CONFIG_EROFS_FS_ZIP
if (sbi->cache_strategy == EROFS_ZIP_CACHE_DISABLED) {
seq_puts(seq, ",cache_strategy=disabled");
@ -615,7 +548,6 @@ static int erofs_remount(struct super_block *sb, int *flags, char *data)
{
struct erofs_sb_info *sbi = EROFS_SB(sb);
unsigned int org_mnt_opt = sbi->mount_opt;
unsigned int org_inject_rate = erofs_get_fault_rate(sbi);
int err;
DBG_BUGON(!sb_rdonly(sb));
@ -631,9 +563,7 @@ static int erofs_remount(struct super_block *sb, int *flags, char *data)
*flags |= SB_RDONLY;
return 0;
out:
__erofs_build_fault_attr(sbi, org_inject_rate);
sbi->mount_opt = org_mnt_opt;
return err;
}

8
fs/erofs/zdata.c
View File

@ -724,15 +724,9 @@ static inline void z_erofs_vle_read_endio(struct bio *bio)
DBG_BUGON(PageUptodate(page));
DBG_BUGON(!page->mapping);
if (!sbi && !z_erofs_page_is_staging(page)) {
if (!sbi && !z_erofs_page_is_staging(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);