diff options
Diffstat (limited to 'drivers/md')
| -rw-r--r-- | drivers/md/md.c | 123 |
1 files changed, 123 insertions, 0 deletions
diff --git a/drivers/md/md.c b/drivers/md/md.c index 463a392c0705..7f5ffc51c28e 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -2711,6 +2711,35 @@ static ssize_t recovery_start_store(mdk_rdev_t *rdev, const char *buf, size_t le static struct rdev_sysfs_entry rdev_recovery_start = __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store); + +static ssize_t +badblocks_show(struct badblocks *bb, char *page, int unack); +static ssize_t +badblocks_store(struct badblocks *bb, const char *page, size_t len, int unack); + +static ssize_t bb_show(mdk_rdev_t *rdev, char *page) +{ + return badblocks_show(&rdev->badblocks, page, 0); +} +static ssize_t bb_store(mdk_rdev_t *rdev, const char *page, size_t len) +{ + return badblocks_store(&rdev->badblocks, page, len, 0); +} +static struct rdev_sysfs_entry rdev_bad_blocks = +__ATTR(bad_blocks, S_IRUGO|S_IWUSR, bb_show, bb_store); + + +static ssize_t ubb_show(mdk_rdev_t *rdev, char *page) +{ + return badblocks_show(&rdev->badblocks, page, 1); +} +static ssize_t ubb_store(mdk_rdev_t *rdev, const char *page, size_t len) +{ + return badblocks_store(&rdev->badblocks, page, len, 1); +} +static struct rdev_sysfs_entry rdev_unack_bad_blocks = +__ATTR(unacknowledged_bad_blocks, S_IRUGO|S_IWUSR, ubb_show, ubb_store); + static struct attribute *rdev_default_attrs[] = { &rdev_state.attr, &rdev_errors.attr, @@ -2718,6 +2747,8 @@ static struct attribute *rdev_default_attrs[] = { &rdev_offset.attr, &rdev_size.attr, &rdev_recovery_start.attr, + &rdev_bad_blocks.attr, + &rdev_unack_bad_blocks.attr, NULL, }; static ssize_t @@ -7736,6 +7767,98 @@ void md_ack_all_badblocks(struct badblocks *bb) } EXPORT_SYMBOL_GPL(md_ack_all_badblocks); +/* sysfs access to bad-blocks list. + * We present two files. + * 'bad-blocks' lists sector numbers and lengths of ranges that + * are recorded as bad. The list is truncated to fit within + * the one-page limit of sysfs. + * Writing "sector length" to this file adds an acknowledged + * bad block list. + * 'unacknowledged-bad-blocks' lists bad blocks that have not yet + * been acknowledged. Writing to this file adds bad blocks + * without acknowledging them. This is largely for testing. + */ + +static ssize_t +badblocks_show(struct badblocks *bb, char *page, int unack) +{ + size_t len; + int i; + u64 *p = bb->page; + unsigned seq; + + if (bb->shift < 0) + return 0; + +retry: + seq = read_seqbegin(&bb->lock); + + len = 0; + i = 0; + + while (len < PAGE_SIZE && i < bb->count) { + sector_t s = BB_OFFSET(p[i]); + unsigned int length = BB_LEN(p[i]); + int ack = BB_ACK(p[i]); + i++; + + if (unack && ack) + continue; + + len += snprintf(page+len, PAGE_SIZE-len, "%llu %u\n", + (unsigned long long)s << bb->shift, + length << bb->shift); + } + + if (read_seqretry(&bb->lock, seq)) + goto retry; + + return len; +} + +#define DO_DEBUG 1 + +static ssize_t +badblocks_store(struct badblocks *bb, const char *page, size_t len, int unack) +{ + unsigned long long sector; + int length; + char newline; +#ifdef DO_DEBUG + /* Allow clearing via sysfs *only* for testing/debugging. + * Normally only a successful write may clear a badblock + */ + int clear = 0; + if (page[0] == '-') { + clear = 1; + page++; + } +#endif /* DO_DEBUG */ + + switch (sscanf(page, "%llu %d%c", §or, &length, &newline)) { + case 3: + if (newline != '\n') + return -EINVAL; + case 2: + if (length <= 0) + return -EINVAL; + break; + default: + return -EINVAL; + } + +#ifdef DO_DEBUG + if (clear) { + md_clear_badblocks(bb, sector, length); + return len; + } +#endif /* DO_DEBUG */ + if (md_set_badblocks(bb, sector, length, !unack)) + return len; + else + return -ENOSPC; +} + static int md_notify_reboot(struct notifier_block *this, unsigned long code, void *x) { |