FIO参数
ignore_error=str
Sometimes you want to ignore some errors during test in that case you can specify error list for each error type.
ignore_error=READ_ERR_LIST,WRITE_ERR_LIST,VERIFY_ERR_LIST
errors for given error type is separated with ':'. Error may be symbol ('ENOSPC', 'ENOMEM') or an integer.
Example: ignore_error=EAGAIN,ENOSPC:122 .
This option will ignore EAGAIN from READ, and ENOSPC and 122(EDQUOT) from WRITE.
意思是这个参数有三个域 分别是读，写，verify 要想让着三个类型忽略某种错需要后面跟上：加错误类型。而错误类型就是OS的Error的返回码
{
.name = "ignore_error",
.type = FIO_OPT_STR,
.cb = str_ignore_error_cb,
.off1 = td_var_offset(ignore_error_nr),
.help = "Set a specific list of errors to ignore",
.parent = "rw",
.category = FIO_OPT_C_GENERAL,
.group = FIO_OPT_G_ERR,
}
continue_on_error=verify, 当出现error是忽略并继续进行测试。
{
.name = "continue_on_error",
.lname = "Continue on error",
.type = FIO_OPT_STR,
.off1 = td_var_offset(continue_on_error),
.help = "Continue on non-fatal errors during IO",
.def = "none",
.category = FIO_OPT_C_GENERAL,
.group = FIO_OPT_G_ERR,
.posval = {
{ .ival = "none",
.oval = ERROR_TYPE_NONE,
.help = "Exit when an error is encountered",
},
{ .ival = "read",
.oval = ERROR_TYPE_READ,
.help = "Continue on read errors only",
},
{ .ival = "write",
.oval = ERROR_TYPE_WRITE,
.help = "Continue on write errors only",
},
{ .ival = "io",
.oval = ERROR_TYPE_READ | ERROR_TYPE_WRITE,
.help = "Continue on any IO errors",
},
{ .ival = "verify",
.oval = ERROR_TYPE_VERIFY,
.help = "Continue on verify errors only",
},
{ .ival = "all",
.oval = ERROR_TYPE_ANY,
.help = "Continue on all io and verify errors",
},
{ .ival = "0",
.oval = ERROR_TYPE_NONE,
.help = "Alias for 'none'",
},
{ .ival = "1",
.oval = ERROR_TYPE_ANY,
.help = "Alias for 'all'",
},
},
}
FIo 验证数据一致性必须所有的数据都写满才行，否则校验就会失败。
struct verify_header {
uint16_t magic;
uint16_t verify_type;
uint32_t len;
uint64_t rand_seed;
uint32_t crc32;
};
static int verify_header(struct io_u *io_u, struct verify_header *hdr,
unsigned int hdr_num, unsigned int hdr_len);
verify_header()
check verify_header 的 magic是否匹配 ；#define FIO_HDR_MAGIC0xacca;
check len 和hdr_len要相等。
hdr->rand_seed 和 io_u->rand_seed要相等。
根据hdr里的内容，重新计算crc，看和hdr->crc32是否一致。
crc = fio_crc32c(p, offsetof(struct verify_header, crc32));
/**/
crc = fio_crc32c(p, ((size_t) &((struct verify_header *)0)->crc32));
如果匹配，header校验成功.
static void populate_hdr(struct thread_data *td, struct io_u *io_u, struct verify_header *hdr, unsigned int header_num, unsigned int header_len)
为hdr各个成员赋值。
data_len = header_len - hdr_size(hdr);
/*The function do fill the verify data(verify_header + crc32) at the address 'struct verify_header *hdr'*/
static void fill_pattern_headers(struct thread_data *td, struct io_u *io_u, unsigned long seed, int use_seed)