diff options
| -rw-r--r-- | drivers/md/md.c | 59 |
1 files changed, 51 insertions, 8 deletions
diff --git a/drivers/md/md.c b/drivers/md/md.c index 8238c1c0ec0..d002b8301fc 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -131,6 +131,8 @@ static ctl_table raid_root_table[] = { static struct block_device_operations md_fops; +static int start_readonly; + /* * Enables to iterate over all existing md arrays * all_mddevs_lock protects this list. @@ -2029,6 +2031,9 @@ static int do_md_run(mddev_t * mddev) mddev->resync_max_sectors = mddev->size << 1; /* may be over-ridden by personality */ mddev->barriers_work = 1; + if (start_readonly) + mddev->ro = 2; /* read-only, but switch on first write */ + /* before we start the array running, initialise the bitmap */ err = bitmap_create(mddev); if (err) @@ -2141,7 +2146,7 @@ static int do_md_stop(mddev_t * mddev, int ro) if (ro) { err = -ENXIO; - if (mddev->ro) + if (mddev->ro==1) goto out; mddev->ro = 1; } else { @@ -3258,12 +3263,22 @@ static int md_ioctl(struct inode *inode, struct file *file, /* * The remaining ioctls are changing the state of the - * superblock, so we do not allow read-only arrays - * here: + * superblock, so we do not allow them on read-only arrays. + * However non-MD ioctls (e.g. get-size) will still come through + * here and hit the 'default' below, so only disallow + * 'md' ioctls, and switch to rw mode if started auto-readonly. */ - if (mddev->ro) { - err = -EROFS; - goto abort_unlock; + if (_IOC_TYPE(cmd) == MD_MAJOR && + mddev->ro && mddev->pers) { + if (mddev->ro == 2) { + mddev->ro = 0; + set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); + md_wakeup_thread(mddev->thread); + + } else { + err = -EROFS; + goto abort_unlock; + } } switch (cmd) @@ -3651,8 +3666,10 @@ static int md_seq_show(struct seq_file *seq, void *v) seq_printf(seq, "%s : %sactive", mdname(mddev), mddev->pers ? "" : "in"); if (mddev->pers) { - if (mddev->ro) + if (mddev->ro==1) seq_printf(seq, " (read-only)"); + if (mddev->ro==2) + seq_printf(seq, "(auto-read-only)"); seq_printf(seq, " %s", mddev->pers->name); } @@ -3696,7 +3713,9 @@ static int md_seq_show(struct seq_file *seq, void *v) status_resync (seq, mddev); seq_printf(seq, "\n "); } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2) - seq_printf(seq, " resync=DELAYED\n "); + seq_printf(seq, "\tresync=DELAYED\n "); + else if (mddev->recovery_cp < MaxSector) + seq_printf(seq, "\tresync=PENDING\n "); } else seq_printf(seq, "\n "); @@ -3833,6 +3852,13 @@ void md_write_start(mddev_t *mddev, struct bio *bi) if (bio_data_dir(bi) != WRITE) return; + BUG_ON(mddev->ro == 1); + if (mddev->ro == 2) { + /* need to switch to read/write */ + mddev->ro = 0; + set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); + md_wakeup_thread(mddev->thread); + } atomic_inc(&mddev->writes_pending); if (mddev->in_sync) { spin_lock_irq(&mddev->write_lock); @@ -4431,6 +4457,23 @@ static __exit void md_exit(void) module_init(md_init) module_exit(md_exit) +static int get_ro(char *buffer, struct kernel_param *kp) +{ + return sprintf(buffer, "%d", start_readonly); +} +static int set_ro(const char *val, struct kernel_param *kp) +{ + char *e; + int num = simple_strtoul(val, &e, 10); + if (*val && (*e == '\0' || *e == '\n')) { + start_readonly = num; + return 0;; + } + return -EINVAL; +} + +module_param_call(start_ro, set_ro, get_ro, NULL, 0600); + EXPORT_SYMBOL(register_md_personality); EXPORT_SYMBOL(unregister_md_personality); EXPORT_SYMBOL(md_error); |