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-rw-r--r--drivers/md/md.c227
1 files changed, 155 insertions, 72 deletions
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 20ca80b7dc2..2897df90df4 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -34,6 +34,7 @@
#include <linux/module.h>
#include <linux/config.h>
+#include <linux/kthread.h>
#include <linux/linkage.h>
#include <linux/raid/md.h>
#include <linux/raid/bitmap.h>
@@ -73,7 +74,7 @@ static DEFINE_SPINLOCK(pers_lock);
* Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
* is 1000 KB/sec, so the extra system load does not show up that much.
* Increase it if you want to have more _guaranteed_ speed. Note that
- * the RAID driver will use the maximum available bandwith if the IO
+ * the RAID driver will use the maximum available bandwidth if the IO
* subsystem is idle. There is also an 'absolute maximum' reconstruction
* speed limit - in case reconstruction slows down your system despite
* idle IO detection.
@@ -393,7 +394,7 @@ int sync_page_io(struct block_device *bdev, sector_t sector, int size,
return ret;
}
-static int read_disk_sb(mdk_rdev_t * rdev)
+static int read_disk_sb(mdk_rdev_t * rdev, int size)
{
char b[BDEVNAME_SIZE];
if (!rdev->sb_page) {
@@ -404,7 +405,7 @@ static int read_disk_sb(mdk_rdev_t * rdev)
return 0;
- if (!sync_page_io(rdev->bdev, rdev->sb_offset<<1, MD_SB_BYTES, rdev->sb_page, READ))
+ if (!sync_page_io(rdev->bdev, rdev->sb_offset<<1, size, rdev->sb_page, READ))
goto fail;
rdev->sb_loaded = 1;
return 0;
@@ -531,7 +532,7 @@ static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version
sb_offset = calc_dev_sboffset(rdev->bdev);
rdev->sb_offset = sb_offset;
- ret = read_disk_sb(rdev);
+ ret = read_disk_sb(rdev, MD_SB_BYTES);
if (ret) return ret;
ret = -EINVAL;
@@ -564,6 +565,7 @@ static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version
rdev->preferred_minor = sb->md_minor;
rdev->data_offset = 0;
+ rdev->sb_size = MD_SB_BYTES;
if (sb->level == LEVEL_MULTIPATH)
rdev->desc_nr = -1;
@@ -623,6 +625,7 @@ static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev)
mddev->size = sb->size;
mddev->events = md_event(sb);
mddev->bitmap_offset = 0;
+ mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
if (sb->state & (1<<MD_SB_CLEAN))
mddev->recovery_cp = MaxSector;
@@ -643,12 +646,12 @@ static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev)
if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
mddev->bitmap_file == NULL) {
- if (mddev->level != 1) {
+ if (mddev->level != 1 && mddev->level != 5 && mddev->level != 6) {
/* FIXME use a better test */
printk(KERN_WARNING "md: bitmaps only support for raid1\n");
return -EINVAL;
}
- mddev->bitmap_offset = (MD_SB_BYTES >> 9);
+ mddev->bitmap_offset = mddev->default_bitmap_offset;
}
} else if (mddev->pers == NULL) {
@@ -669,6 +672,7 @@ static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev)
if (mddev->level != LEVEL_MULTIPATH) {
rdev->faulty = 0;
+ rdev->flags = 0;
desc = sb->disks + rdev->desc_nr;
if (desc->state & (1<<MD_DISK_FAULTY))
@@ -678,6 +682,8 @@ static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev)
rdev->in_sync = 1;
rdev->raid_disk = desc->raid_disk;
}
+ if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
+ set_bit(WriteMostly, &rdev->flags);
} else /* MULTIPATH are always insync */
rdev->in_sync = 1;
return 0;
@@ -706,6 +712,8 @@ static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev)
int i;
int active=0, working=0,failed=0,spare=0,nr_disks=0;
+ rdev->sb_size = MD_SB_BYTES;
+
sb = (mdp_super_t*)page_address(rdev->sb_page);
memset(sb, 0, sizeof(*sb));
@@ -776,6 +784,8 @@ static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev)
spare++;
working++;
}
+ if (test_bit(WriteMostly, &rdev2->flags))
+ d->state |= (1<<MD_DISK_WRITEMOSTLY);
}
/* now set the "removed" and "faulty" bits on any missing devices */
@@ -831,6 +841,7 @@ static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
int ret;
sector_t sb_offset;
char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
+ int bmask;
/*
* Calculate the position of the superblock.
@@ -859,7 +870,10 @@ static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
}
rdev->sb_offset = sb_offset;
- ret = read_disk_sb(rdev);
+ /* superblock is rarely larger than 1K, but it can be larger,
+ * and it is safe to read 4k, so we do that
+ */
+ ret = read_disk_sb(rdev, 4096);
if (ret) return ret;
@@ -869,7 +883,7 @@ static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
sb->major_version != cpu_to_le32(1) ||
le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
le64_to_cpu(sb->super_offset) != (rdev->sb_offset<<1) ||
- sb->feature_map != 0)
+ (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
return -EINVAL;
if (calc_sb_1_csum(sb) != sb->sb_csum) {
@@ -885,6 +899,11 @@ static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
rdev->preferred_minor = 0xffff;
rdev->data_offset = le64_to_cpu(sb->data_offset);
+ rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
+ bmask = queue_hardsect_size(rdev->bdev->bd_disk->queue)-1;
+ if (rdev->sb_size & bmask)
+ rdev-> sb_size = (rdev->sb_size | bmask)+1;
+
if (refdev == 0)
return 1;
else {
@@ -939,13 +958,15 @@ static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
mddev->size = le64_to_cpu(sb->size)/2;
mddev->events = le64_to_cpu(sb->events);
mddev->bitmap_offset = 0;
+ mddev->default_bitmap_offset = 0;
+ mddev->default_bitmap_offset = 1024;
mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
memcpy(mddev->uuid, sb->set_uuid, 16);
mddev->max_disks = (4096-256)/2;
- if ((le32_to_cpu(sb->feature_map) & 1) &&
+ if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
mddev->bitmap_file == NULL ) {
if (mddev->level != 1) {
printk(KERN_WARNING "md: bitmaps only supported for raid1\n");
@@ -986,6 +1007,9 @@ static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
rdev->raid_disk = role;
break;
}
+ rdev->flags = 0;
+ if (sb->devflags & WriteMostly1)
+ set_bit(WriteMostly, &rdev->flags);
} else /* MULTIPATH are always insync */
rdev->in_sync = 1;
@@ -1017,7 +1041,7 @@ static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
if (mddev->bitmap && mddev->bitmap_file == NULL) {
sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_offset);
- sb->feature_map = cpu_to_le32(1);
+ sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
}
max_dev = 0;
@@ -1363,7 +1387,7 @@ repeat:
dprintk("%s ", bdevname(rdev->bdev,b));
if (!rdev->faulty) {
md_super_write(mddev,rdev,
- rdev->sb_offset<<1, MD_SB_BYTES,
+ rdev->sb_offset<<1, rdev->sb_size,
rdev->sb_page);
dprintk(KERN_INFO "(write) %s's sb offset: %llu\n",
bdevname(rdev->bdev,b),
@@ -2073,6 +2097,8 @@ static int get_array_info(mddev_t * mddev, void __user * arg)
info.state = 0;
if (mddev->in_sync)
info.state = (1<<MD_SB_CLEAN);
+ if (mddev->bitmap && mddev->bitmap_offset)
+ info.state = (1<<MD_SB_BITMAP_PRESENT);
info.active_disks = active;
info.working_disks = working;
info.failed_disks = failed;
@@ -2087,7 +2113,7 @@ static int get_array_info(mddev_t * mddev, void __user * arg)
return 0;
}
-static int get_bitmap_file(mddev_t * mddev, void * arg)
+static int get_bitmap_file(mddev_t * mddev, void __user * arg)
{
mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
char *ptr, *buf = NULL;
@@ -2146,6 +2172,8 @@ static int get_disk_info(mddev_t * mddev, void __user * arg)
info.state |= (1<<MD_DISK_ACTIVE);
info.state |= (1<<MD_DISK_SYNC);
}
+ if (test_bit(WriteMostly, &rdev->flags))
+ info.state |= (1<<MD_DISK_WRITEMOSTLY);
} else {
info.major = info.minor = 0;
info.raid_disk = -1;
@@ -2210,8 +2238,11 @@ static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
mdname(mddev));
return -EINVAL;
}
- rdev = md_import_device(dev, mddev->major_version,
- mddev->minor_version);
+ if (mddev->persistent)
+ rdev = md_import_device(dev, mddev->major_version,
+ mddev->minor_version);
+ else
+ rdev = md_import_device(dev, -1, -1);
if (IS_ERR(rdev)) {
printk(KERN_WARNING
"md: md_import_device returned %ld\n",
@@ -2231,6 +2262,9 @@ static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
rdev->saved_raid_disk = rdev->raid_disk;
rdev->in_sync = 0; /* just to be sure */
+ if (info->state & (1<<MD_DISK_WRITEMOSTLY))
+ set_bit(WriteMostly, &rdev->flags);
+
rdev->raid_disk = -1;
err = bind_rdev_to_array(rdev, mddev);
if (err)
@@ -2271,6 +2305,9 @@ static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
else
rdev->in_sync = 0;
+ if (info->state & (1<<MD_DISK_WRITEMOSTLY))
+ set_bit(WriteMostly, &rdev->flags);
+
err = bind_rdev_to_array(rdev, mddev);
if (err) {
export_rdev(rdev);
@@ -2430,25 +2467,51 @@ static int set_bitmap_file(mddev_t *mddev, int fd)
{
int err;
- if (mddev->pers)
- return -EBUSY;
+ if (mddev->pers) {
+ if (!mddev->pers->quiesce)
+ return -EBUSY;
+ if (mddev->recovery || mddev->sync_thread)
+ return -EBUSY;
+ /* we should be able to change the bitmap.. */
+ }
- mddev->bitmap_file = fget(fd);
- if (mddev->bitmap_file == NULL) {
- printk(KERN_ERR "%s: error: failed to get bitmap file\n",
- mdname(mddev));
- return -EBADF;
- }
+ if (fd >= 0) {
+ if (mddev->bitmap)
+ return -EEXIST; /* cannot add when bitmap is present */
+ mddev->bitmap_file = fget(fd);
- err = deny_bitmap_write_access(mddev->bitmap_file);
- if (err) {
- printk(KERN_ERR "%s: error: bitmap file is already in use\n",
- mdname(mddev));
- fput(mddev->bitmap_file);
- mddev->bitmap_file = NULL;
- } else
+ if (mddev->bitmap_file == NULL) {
+ printk(KERN_ERR "%s: error: failed to get bitmap file\n",
+ mdname(mddev));
+ return -EBADF;
+ }
+
+ err = deny_bitmap_write_access(mddev->bitmap_file);
+ if (err) {
+ printk(KERN_ERR "%s: error: bitmap file is already in use\n",
+ mdname(mddev));
+ fput(mddev->bitmap_file);
+ mddev->bitmap_file = NULL;
+ return err;
+ }
mddev->bitmap_offset = 0; /* file overrides offset */
+ } else if (mddev->bitmap == NULL)
+ return -ENOENT; /* cannot remove what isn't there */
+ err = 0;
+ if (mddev->pers) {
+ mddev->pers->quiesce(mddev, 1);
+ if (fd >= 0)
+ err = bitmap_create(mddev);
+ if (fd < 0 || err)
+ bitmap_destroy(mddev);
+ mddev->pers->quiesce(mddev, 0);
+ } else if (fd < 0) {
+ if (mddev->bitmap_file)
+ fput(mddev->bitmap_file);
+ mddev->bitmap_file = NULL;
+ }
+
return err;
}
@@ -2528,6 +2591,11 @@ static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
{
int rv = 0;
int cnt = 0;
+ int state = 0;
+
+ /* calculate expected state,ignoring low bits */
+ if (mddev->bitmap && mddev->bitmap_offset)
+ state |= (1 << MD_SB_BITMAP_PRESENT);
if (mddev->major_version != info->major_version ||
mddev->minor_version != info->minor_version ||
@@ -2536,12 +2604,16 @@ static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
mddev->level != info->level ||
/* mddev->layout != info->layout || */
!mddev->persistent != info->not_persistent||
- mddev->chunk_size != info->chunk_size )
+ mddev->chunk_size != info->chunk_size ||
+ /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
+ ((state^info->state) & 0xfffffe00)
+ )
return -EINVAL;
/* Check there is only one change */
if (mddev->size != info->size) cnt++;
if (mddev->raid_disks != info->raid_disks) cnt++;
if (mddev->layout != info->layout) cnt++;
+ if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) cnt++;
if (cnt == 0) return 0;
if (cnt > 1) return -EINVAL;
@@ -2620,6 +2692,35 @@ static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
}
}
}
+ if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
+ if (mddev->pers->quiesce == NULL)
+ return -EINVAL;
+ if (mddev->recovery || mddev->sync_thread)
+ return -EBUSY;
+ if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
+ /* add the bitmap */
+ if (mddev->bitmap)
+ return -EEXIST;
+ if (mddev->default_bitmap_offset == 0)
+ return -EINVAL;
+ mddev->bitmap_offset = mddev->default_bitmap_offset;
+ mddev->pers->quiesce(mddev, 1);
+ rv = bitmap_create(mddev);
+ if (rv)
+ bitmap_destroy(mddev);
+ mddev->pers->quiesce(mddev, 0);
+ } else {
+ /* remove the bitmap */
+ if (!mddev->bitmap)
+ return -ENOENT;
+ if (mddev->bitmap->file)
+ return -EINVAL;
+ mddev->pers->quiesce(mddev, 1);
+ bitmap_destroy(mddev);
+ mddev->pers->quiesce(mddev, 0);
+ mddev->bitmap_offset = 0;
+ }
+ }
md_update_sb(mddev);
return rv;
}
@@ -2781,7 +2882,7 @@ static int md_ioctl(struct inode *inode, struct file *file,
goto done_unlock;
case GET_BITMAP_FILE:
- err = get_bitmap_file(mddev, (void *)arg);
+ err = get_bitmap_file(mddev, argp);
goto done_unlock;
case GET_DISK_INFO:
@@ -2950,18 +3051,6 @@ static int md_thread(void * arg)
{
mdk_thread_t *thread = arg;
- lock_kernel();
-
- /*
- * Detach thread
- */
-
- daemonize(thread->name, mdname(thread->mddev));
-
- current->exit_signal = SIGCHLD;
- allow_signal(SIGKILL);
- thread->tsk = current;
-
/*
* md_thread is a 'system-thread', it's priority should be very
* high. We avoid resource deadlocks individually in each
@@ -2973,14 +3062,14 @@ static int md_thread(void * arg)
* bdflush, otherwise bdflush will deadlock if there are too
* many dirty RAID5 blocks.
*/
- unlock_kernel();
complete(thread->event);
- while (thread->run) {
+ while (!kthread_should_stop()) {
void (*run)(mddev_t *);
wait_event_interruptible_timeout(thread->wqueue,
- test_bit(THREAD_WAKEUP, &thread->flags),
+ test_bit(THREAD_WAKEUP, &thread->flags)
+ || kthread_should_stop(),
thread->timeout);
try_to_freeze();
@@ -2989,11 +3078,8 @@ static int md_thread(void * arg)
run = thread->run;
if (run)
run(thread->mddev);
-
- if (signal_pending(current))
- flush_signals(current);
}
- complete(thread->event);
+
return 0;
}
@@ -3010,11 +3096,9 @@ mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev,
const char *name)
{
mdk_thread_t *thread;
- int ret;
struct completion event;
- thread = (mdk_thread_t *) kmalloc
- (sizeof(mdk_thread_t), GFP_KERNEL);
+ thread = kmalloc(sizeof(mdk_thread_t), GFP_KERNEL);
if (!thread)
return NULL;
@@ -3027,8 +3111,8 @@ mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev,
thread->mddev = mddev;
thread->name = name;
thread->timeout = MAX_SCHEDULE_TIMEOUT;
- ret = kernel_thread(md_thread, thread, 0);
- if (ret < 0) {
+ thread->tsk = kthread_run(md_thread, thread, mdname(thread->mddev));
+ if (IS_ERR(thread->tsk)) {
kfree(thread);
return NULL;
}
@@ -3038,21 +3122,9 @@ mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev,
void md_unregister_thread(mdk_thread_t *thread)
{
- struct completion event;
-
- init_completion(&event);
-
- thread->event = &event;
-
- /* As soon as ->run is set to NULL, the task could disappear,
- * so we need to hold tasklist_lock until we have sent the signal
- */
dprintk("interrupting MD-thread pid %d\n", thread->tsk->pid);
- read_lock(&tasklist_lock);
- thread->run = NULL;
- send_sig(SIGKILL, thread->tsk, 1);
- read_unlock(&tasklist_lock);
- wait_for_completion(&event);
+
+ kthread_stop(thread->tsk);
kfree(thread);
}
@@ -3259,10 +3331,13 @@ static int md_seq_show(struct seq_file *seq, void *v)
char b[BDEVNAME_SIZE];
seq_printf(seq, " %s[%d]",
bdevname(rdev->bdev,b), rdev->desc_nr);
+ if (test_bit(WriteMostly, &rdev->flags))
+ seq_printf(seq, "(W)");
if (rdev->faulty) {
seq_printf(seq, "(F)");
continue;
- }
+ } else if (rdev->raid_disk < 0)
+ seq_printf(seq, "(S)"); /* spare */
size += rdev->size;
}
@@ -3274,6 +3349,15 @@ static int md_seq_show(struct seq_file *seq, void *v)
seq_printf(seq, "\n %llu blocks",
(unsigned long long)size);
}
+ if (mddev->persistent) {
+ if (mddev->major_version != 0 ||
+ mddev->minor_version != 90) {
+ seq_printf(seq," super %d.%d",
+ mddev->major_version,
+ mddev->minor_version);
+ }
+ } else
+ seq_printf(seq, " super non-persistent");
if (mddev->pers) {
mddev->pers->status (seq, mddev);
@@ -3416,7 +3500,6 @@ void md_done_sync(mddev_t *mddev, int blocks, int ok)
*/
void md_write_start(mddev_t *mddev, struct bio *bi)
{
- DEFINE_WAIT(w);
if (bio_data_dir(bi) != WRITE)
return;
@@ -3533,7 +3616,7 @@ static void md_do_sync(mddev_t *mddev)
printk(KERN_INFO "md: syncing RAID array %s\n", mdname(mddev));
printk(KERN_INFO "md: minimum _guaranteed_ reconstruction speed:"
" %d KB/sec/disc.\n", sysctl_speed_limit_min);
- printk(KERN_INFO "md: using maximum available idle IO bandwith "
+ printk(KERN_INFO "md: using maximum available idle IO bandwidth "
"(but not more than %d KB/sec) for reconstruction.\n",
sysctl_speed_limit_max);
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-11-22 05:38:59 +0000