summaryrefslogtreecommitdiff
path: root/drivers/md/md.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/md/md.c')
-rw-r--r--drivers/md/md.c160
1 files changed, 122 insertions, 38 deletions
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 2b4315d7e5d6..65814b0340cb 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -33,6 +33,7 @@
*/
#include <linux/module.h>
+#include <linux/kernel.h>
#include <linux/kthread.h>
#include <linux/linkage.h>
#include <linux/raid/md.h>
@@ -273,6 +274,7 @@ static mddev_t * mddev_find(dev_t unit)
atomic_set(&new->active, 1);
spin_lock_init(&new->write_lock);
init_waitqueue_head(&new->sb_wait);
+ new->reshape_position = MaxSector;
new->queue = blk_alloc_queue(GFP_KERNEL);
if (!new->queue) {
@@ -589,14 +591,41 @@ abort:
return ret;
}
+
+static u32 md_csum_fold(u32 csum)
+{
+ csum = (csum & 0xffff) + (csum >> 16);
+ return (csum & 0xffff) + (csum >> 16);
+}
+
static unsigned int calc_sb_csum(mdp_super_t * sb)
{
+ u64 newcsum = 0;
+ u32 *sb32 = (u32*)sb;
+ int i;
unsigned int disk_csum, csum;
disk_csum = sb->sb_csum;
sb->sb_csum = 0;
- csum = csum_partial((void *)sb, MD_SB_BYTES, 0);
+
+ for (i = 0; i < MD_SB_BYTES/4 ; i++)
+ newcsum += sb32[i];
+ csum = (newcsum & 0xffffffff) + (newcsum>>32);
+
+
+#ifdef CONFIG_ALPHA
+ /* This used to use csum_partial, which was wrong for several
+ * reasons including that different results are returned on
+ * different architectures. It isn't critical that we get exactly
+ * the same return value as before (we always csum_fold before
+ * testing, and that removes any differences). However as we
+ * know that csum_partial always returned a 16bit value on
+ * alphas, do a fold to maximise conformity to previous behaviour.
+ */
+ sb->sb_csum = md_csum_fold(disk_csum);
+#else
sb->sb_csum = disk_csum;
+#endif
return csum;
}
@@ -684,7 +713,7 @@ static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version
if (sb->raid_disks <= 0)
goto abort;
- if (csum_fold(calc_sb_csum(sb)) != csum_fold(sb->sb_csum)) {
+ if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
printk(KERN_WARNING "md: invalid superblock checksum on %s\n",
b);
goto abort;
@@ -694,6 +723,17 @@ static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version
rdev->data_offset = 0;
rdev->sb_size = MD_SB_BYTES;
+ if (sb->state & (1<<MD_SB_BITMAP_PRESENT)) {
+ if (sb->level != 1 && sb->level != 4
+ && sb->level != 5 && sb->level != 6
+ && sb->level != 10) {
+ /* FIXME use a better test */
+ printk(KERN_WARNING
+ "md: bitmaps not supported for this level.\n");
+ goto abort;
+ }
+ }
+
if (sb->level == LEVEL_MULTIPATH)
rdev->desc_nr = -1;
else
@@ -792,16 +832,8 @@ static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev)
mddev->max_disks = MD_SB_DISKS;
if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
- mddev->bitmap_file == NULL) {
- if (mddev->level != 1 && mddev->level != 4
- && mddev->level != 5 && mddev->level != 6
- && mddev->level != 10) {
- /* FIXME use a better test */
- printk(KERN_WARNING "md: bitmaps not supported for this level.\n");
- return -EINVAL;
- }
+ mddev->bitmap_file == NULL)
mddev->bitmap_offset = mddev->default_bitmap_offset;
- }
} else if (mddev->pers == NULL) {
/* Insist on good event counter while assembling */
@@ -1058,6 +1090,18 @@ static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
bdevname(rdev->bdev,b));
return -EINVAL;
}
+ if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET)) {
+ if (sb->level != cpu_to_le32(1) &&
+ sb->level != cpu_to_le32(4) &&
+ sb->level != cpu_to_le32(5) &&
+ sb->level != cpu_to_le32(6) &&
+ sb->level != cpu_to_le32(10)) {
+ printk(KERN_WARNING
+ "md: bitmaps not supported for this level.\n");
+ return -EINVAL;
+ }
+ }
+
rdev->preferred_minor = 0xffff;
rdev->data_offset = le64_to_cpu(sb->data_offset);
atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
@@ -1141,14 +1185,9 @@ static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
mddev->max_disks = (4096-256)/2;
if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
- mddev->bitmap_file == NULL ) {
- if (mddev->level != 1 && mddev->level != 5 && mddev->level != 6
- && mddev->level != 10) {
- printk(KERN_WARNING "md: bitmaps not supported for this level.\n");
- return -EINVAL;
- }
+ mddev->bitmap_file == NULL )
mddev->bitmap_offset = (__s32)le32_to_cpu(sb->bitmap_offset);
- }
+
if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
mddev->reshape_position = le64_to_cpu(sb->reshape_position);
mddev->delta_disks = le32_to_cpu(sb->delta_disks);
@@ -2204,6 +2243,10 @@ static ssize_t
layout_show(mddev_t *mddev, char *page)
{
/* just a number, not meaningful for all levels */
+ if (mddev->reshape_position != MaxSector &&
+ mddev->layout != mddev->new_layout)
+ return sprintf(page, "%d (%d)\n",
+ mddev->new_layout, mddev->layout);
return sprintf(page, "%d\n", mddev->layout);
}
@@ -2212,13 +2255,16 @@ layout_store(mddev_t *mddev, const char *buf, size_t len)
{
char *e;
unsigned long n = simple_strtoul(buf, &e, 10);
- if (mddev->pers)
- return -EBUSY;
if (!*buf || (*e && *e != '\n'))
return -EINVAL;
- mddev->layout = n;
+ if (mddev->pers)
+ return -EBUSY;
+ if (mddev->reshape_position != MaxSector)
+ mddev->new_layout = n;
+ else
+ mddev->layout = n;
return len;
}
static struct md_sysfs_entry md_layout =
@@ -2230,6 +2276,10 @@ raid_disks_show(mddev_t *mddev, char *page)
{
if (mddev->raid_disks == 0)
return 0;
+ if (mddev->reshape_position != MaxSector &&
+ mddev->delta_disks != 0)
+ return sprintf(page, "%d (%d)\n", mddev->raid_disks,
+ mddev->raid_disks - mddev->delta_disks);
return sprintf(page, "%d\n", mddev->raid_disks);
}
@@ -2247,7 +2297,11 @@ raid_disks_store(mddev_t *mddev, const char *buf, size_t len)
if (mddev->pers)
rv = update_raid_disks(mddev, n);
- else
+ else if (mddev->reshape_position != MaxSector) {
+ int olddisks = mddev->raid_disks - mddev->delta_disks;
+ mddev->delta_disks = n - olddisks;
+ mddev->raid_disks = n;
+ } else
mddev->raid_disks = n;
return rv ? rv : len;
}
@@ -2257,6 +2311,10 @@ __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
static ssize_t
chunk_size_show(mddev_t *mddev, char *page)
{
+ if (mddev->reshape_position != MaxSector &&
+ mddev->chunk_size != mddev->new_chunk)
+ return sprintf(page, "%d (%d)\n", mddev->new_chunk,
+ mddev->chunk_size);
return sprintf(page, "%d\n", mddev->chunk_size);
}
@@ -2267,12 +2325,15 @@ chunk_size_store(mddev_t *mddev, const char *buf, size_t len)
char *e;
unsigned long n = simple_strtoul(buf, &e, 10);
- if (mddev->pers)
- return -EBUSY;
if (!*buf || (*e && *e != '\n'))
return -EINVAL;
- mddev->chunk_size = n;
+ if (mddev->pers)
+ return -EBUSY;
+ else if (mddev->reshape_position != MaxSector)
+ mddev->new_chunk = n;
+ else
+ mddev->chunk_size = n;
return len;
}
static struct md_sysfs_entry md_chunk_size =
@@ -2637,8 +2698,7 @@ metadata_store(mddev_t *mddev, const char *buf, size_t len)
minor = simple_strtoul(buf, &e, 10);
if (e==buf || (*e && *e != '\n') )
return -EINVAL;
- if (major >= sizeof(super_types)/sizeof(super_types[0]) ||
- super_types[major].name == NULL)
+ if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
return -ENOENT;
mddev->major_version = major;
mddev->minor_version = minor;
@@ -2859,6 +2919,37 @@ suspend_hi_store(mddev_t *mddev, const char *buf, size_t len)
static struct md_sysfs_entry md_suspend_hi =
__ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
+static ssize_t
+reshape_position_show(mddev_t *mddev, char *page)
+{
+ if (mddev->reshape_position != MaxSector)
+ return sprintf(page, "%llu\n",
+ (unsigned long long)mddev->reshape_position);
+ strcpy(page, "none\n");
+ return 5;
+}
+
+static ssize_t
+reshape_position_store(mddev_t *mddev, const char *buf, size_t len)
+{
+ char *e;
+ unsigned long long new = simple_strtoull(buf, &e, 10);
+ if (mddev->pers)
+ return -EBUSY;
+ if (buf == e || (*e && *e != '\n'))
+ return -EINVAL;
+ mddev->reshape_position = new;
+ mddev->delta_disks = 0;
+ mddev->new_level = mddev->level;
+ mddev->new_layout = mddev->layout;
+ mddev->new_chunk = mddev->chunk_size;
+ return len;
+}
+
+static struct md_sysfs_entry md_reshape_position =
+__ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
+ reshape_position_store);
+
static struct attribute *md_default_attrs[] = {
&md_level.attr,
@@ -2871,6 +2962,7 @@ static struct attribute *md_default_attrs[] = {
&md_new_device.attr,
&md_safe_delay.attr,
&md_array_state.attr,
+ &md_reshape_position.attr,
NULL,
};
@@ -3409,6 +3501,7 @@ static int do_md_stop(mddev_t * mddev, int mode)
mddev->size = 0;
mddev->raid_disks = 0;
mddev->recovery_cp = 0;
+ mddev->reshape_position = MaxSector;
} else if (mddev->pers)
printk(KERN_INFO "md: %s switched to read-only mode.\n",
@@ -4019,7 +4112,7 @@ static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
if (info->raid_disks == 0) {
/* just setting version number for superblock loading */
if (info->major_version < 0 ||
- info->major_version >= sizeof(super_types)/sizeof(super_types[0]) ||
+ info->major_version >= ARRAY_SIZE(super_types) ||
super_types[info->major_version].name == NULL) {
/* maybe try to auto-load a module? */
printk(KERN_INFO
@@ -4941,15 +5034,6 @@ static int md_seq_open(struct inode *inode, struct file *file)
return error;
}
-static int md_seq_release(struct inode *inode, struct file *file)
-{
- struct seq_file *m = file->private_data;
- struct mdstat_info *mi = m->private;
- m->private = NULL;
- kfree(mi);
- return seq_release(inode, file);
-}
-
static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
{
struct seq_file *m = filp->private_data;
@@ -4971,7 +5055,7 @@ static const struct file_operations md_seq_fops = {
.open = md_seq_open,
.read = seq_read,
.llseek = seq_lseek,
- .release = md_seq_release,
+ .release = seq_release_private,
.poll = mdstat_poll,
};
generated by cgit v1.2.3 (git 2.39.0) at 2024-11-06 10:28:12 +0300