patch-2.3.43 linux/drivers/block/md.c
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- Lines: 4282
- Date:
Tue Feb 8 18:44:57 2000
- Orig file:
v2.3.42/linux/drivers/block/md.c
- Orig date:
Fri Jan 21 18:19:16 2000
diff -u --recursive --new-file v2.3.42/linux/drivers/block/md.c linux/drivers/block/md.c
@@ -1,21 +1,17 @@
-
/*
md.c : Multiple Devices driver for Linux
- Copyright (C) 1994-96 Marc ZYNGIER
- <zyngier@ufr-info-p7.ibp.fr> or
- <maz@gloups.fdn.fr>
+ Copyright (C) 1998, 1999, 2000 Ingo Molnar
- A lot of inspiration came from hd.c ...
+ completely rewritten, based on the MD driver code from Marc Zyngier
- kerneld support by Boris Tobotras <boris@xtalk.msk.su>
- boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net>
+ Changes:
- RAID-1/RAID-5 extensions by:
- Ingo Molnar, Miguel de Icaza, Gadi Oxman
+ - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar
+ - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net>
+ - kerneld support by Boris Tobotras <boris@xtalk.msk.su>
+ - kmod support by: Cyrus Durgin
+ - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com>
- Changes for kmod by:
- Cyrus Durgin
-
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
@@ -26,731 +22,2857 @@
Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
-/*
- * Current RAID-1,4,5 parallel reconstruction speed limit is 1024 KB/sec, so
- * the extra system load does not show up that much. Increase it if your
- * system can take more.
- */
-#define SPEED_LIMIT 1024
-
#include <linux/config.h>
-#include <linux/module.h>
-#include <linux/version.h>
-#include <linux/malloc.h>
-#include <linux/mm.h>
-#include <linux/md.h>
-#include <linux/hdreg.h>
-#include <linux/stat.h>
-#include <linux/fs.h>
-#include <linux/proc_fs.h>
-#include <linux/blkdev.h>
-#include <linux/genhd.h>
-#include <linux/smp_lock.h>
+#include <linux/raid/md.h>
+
#ifdef CONFIG_KMOD
#include <linux/kmod.h>
#endif
-#include <linux/errno.h>
-#include <linux/init.h>
#define __KERNEL_SYSCALLS__
#include <linux/unistd.h>
+#include <asm/unaligned.h>
+
+extern asmlinkage int sys_sched_yield(void);
+extern asmlinkage int sys_setsid(void);
+
+extern unsigned long io_events[MAX_BLKDEV];
+
#define MAJOR_NR MD_MAJOR
#define MD_DRIVER
#include <linux/blk.h>
-#include <linux/blkpg.h>
-#include <asm/uaccess.h>
-#include <asm/bitops.h>
-#include <asm/atomic.h>
#ifdef CONFIG_MD_BOOT
-extern kdev_t name_to_kdev_t(char *line) __init;
+extern kdev_t name_to_kdev_t(char *line) md__init;
+#endif
+
+#define DEBUG 0
+#if DEBUG
+# define dprintk(x...) printk(x)
+#else
+# define dprintk(x...) do { } while(0)
#endif
-static struct hd_struct md_hd_struct[MAX_MD_DEV];
-static int md_blocksizes[MAX_MD_DEV];
-int md_maxreadahead[MAX_MD_DEV];
-#if SUPPORT_RECONSTRUCTION
-static struct md_thread *md_sync_thread = NULL;
-#endif /* SUPPORT_RECONSTRUCTION */
+static mdk_personality_t *pers[MAX_PERSONALITY] = {NULL, };
-int md_size[MAX_MD_DEV]={0, };
+/*
+ * these have to be allocated separately because external
+ * subsystems want to have a pre-defined structure
+ */
+struct hd_struct md_hd_struct[MAX_MD_DEVS];
+static int md_blocksizes[MAX_MD_DEVS];
+static int md_maxreadahead[MAX_MD_DEVS];
+static mdk_thread_t *md_recovery_thread = NULL;
+
+int md_size[MAX_MD_DEVS] = {0, };
static struct gendisk md_gendisk=
{
- MD_MAJOR,
- "md",
- 0,
- 1,
- md_hd_struct,
- md_size,
- MAX_MD_DEV,
- NULL,
- NULL
+ MD_MAJOR,
+ "md",
+ 0,
+ 1,
+ md_hd_struct,
+ md_size,
+ MAX_MD_DEVS,
+ NULL,
+ NULL
};
-static struct md_personality *pers[MAX_PERSONALITY]={NULL, };
-struct md_dev md_dev[MAX_MD_DEV];
+void md_plug_device (request_queue_t *mdqueue, kdev_t dev)
+{
+ mdk_rdev_t * rdev;
+ struct md_list_head *tmp;
+ request_queue_t *q;
+ mddev_t *mddev;
-int md_thread(void * arg);
+ if (!md_test_and_set_bit(0, (atomic_t *)&mdqueue->plugged)) {
+ mddev = kdev_to_mddev(dev);
+ ITERATE_RDEV(mddev,rdev,tmp) {
+ q = blk_get_queue(rdev->dev);
+ generic_unplug_device(q);
+ }
+ queue_task(&mdqueue->plug_tq, &tq_disk);
+ }
+}
-static int legacy_raid_sb (int minor, int pnum)
+static void md_unplug_device (void * data)
{
- int i, factor;
+ mdk_rdev_t * rdev;
+ struct md_list_head *tmp;
+ mddev_t *mddev = (mddev_t *)data;
+ request_queue_t *mdqueue = &mddev->queue, *q;
- factor = 1 << FACTOR_SHIFT(FACTOR((md_dev+minor)));
+ clear_bit(0, (atomic_t *)&mdqueue->plugged);
+ ITERATE_RDEV(mddev,rdev,tmp) {
+ q = blk_get_queue(rdev->dev);
+ generic_unplug_device(q);
+ }
+}
- /*****
- * do size and offset calculations.
- */
- for (i=0; i<md_dev[minor].nb_dev; i++) {
- md_dev[minor].devices[i].size &= ~(factor - 1);
- md_size[minor] += md_dev[minor].devices[i].size;
- md_dev[minor].devices[i].offset=i ? (md_dev[minor].devices[i-1].offset +
- md_dev[minor].devices[i-1].size) : 0;
+/*
+ * Enables to iterate over all existing md arrays
+ */
+static MD_LIST_HEAD(all_mddevs);
+
+/*
+ * The mapping between kdev and mddev is not necessary a simple
+ * one! Eg. HSM uses several sub-devices to implement Logical
+ * Volumes. All these sub-devices map to the same mddev.
+ */
+dev_mapping_t mddev_map [MAX_MD_DEVS] = { {NULL, 0}, };
+
+void add_mddev_mapping (mddev_t * mddev, kdev_t dev, void *data)
+{
+ unsigned int minor = MINOR(dev);
+
+ if (MAJOR(dev) != MD_MAJOR) {
+ MD_BUG();
+ return;
}
- if (pnum == RAID0 >> PERSONALITY_SHIFT)
- md_maxreadahead[minor] = MD_DEFAULT_DISK_READAHEAD * md_dev[minor].nb_dev;
- return 0;
+ if (mddev_map[minor].mddev != NULL) {
+ MD_BUG();
+ return;
+ }
+ mddev_map[minor].mddev = mddev;
+ mddev_map[minor].data = data;
}
-static void free_sb (struct md_dev *mddev)
+void del_mddev_mapping (mddev_t * mddev, kdev_t dev)
{
- int i;
- struct real_dev *realdev;
+ unsigned int minor = MINOR(dev);
- if (mddev->sb) {
- free_page((unsigned long) mddev->sb);
- mddev->sb = NULL;
+ if (MAJOR(dev) != MD_MAJOR) {
+ MD_BUG();
+ return;
}
- for (i = 0; i <mddev->nb_dev; i++) {
- realdev = mddev->devices + i;
- if (realdev->sb) {
- free_page((unsigned long) realdev->sb);
- realdev->sb = NULL;
- }
+ if (mddev_map[minor].mddev != mddev) {
+ MD_BUG();
+ return;
}
+ mddev_map[minor].mddev = NULL;
+ mddev_map[minor].data = NULL;
}
-/*
- * Check one RAID superblock for generic plausibility
- */
+static request_queue_t *md_get_queue (kdev_t dev)
+{
+ mddev_t *mddev = kdev_to_mddev(dev);
-#define BAD_MAGIC KERN_ERR \
-"md: %s: invalid raid superblock magic (%x) on block %u\n"
+ if (!mddev)
+ return NULL;
+ return &mddev->queue;
+}
-#define OUT_OF_MEM KERN_ALERT \
-"md: out of memory.\n"
+static void do_md_request (request_queue_t * q)
+{
+ printk(KERN_ALERT "Got md request, not good...");
+ BUG();
+ return;
+}
-#define NO_DEVICE KERN_ERR \
-"md: disabled device %s\n"
+void md_make_request (int rw, struct buffer_head * bh)
+{
+ mddev_t *mddev = kdev_to_mddev(bh->b_dev);
-#define SUCCESS 0
-#define FAILURE -1
+ if (!mddev || !mddev->pers)
+ bh->b_end_io(bh, 0);
+ else {
+ if ((rw == READ || rw == READA) && buffer_uptodate(bh))
+ bh->b_end_io(bh, 1);
+ else
+ mddev->pers->make_request(mddev, rw, bh);
+ }
+}
-static int analyze_one_sb (struct real_dev * rdev)
+static mddev_t * alloc_mddev (kdev_t dev)
{
- int ret = FAILURE;
- struct buffer_head *bh;
- kdev_t dev = rdev->dev;
- md_superblock_t *sb;
+ request_queue_t *q;
+ mddev_t *mddev;
+
+ if (MAJOR(dev) != MD_MAJOR) {
+ MD_BUG();
+ return 0;
+ }
+ mddev = (mddev_t *) kmalloc(sizeof(*mddev), GFP_KERNEL);
+ if (!mddev)
+ return NULL;
+
+ memset(mddev, 0, sizeof(*mddev));
+
+ mddev->__minor = MINOR(dev);
+ init_MUTEX(&mddev->reconfig_sem);
+ init_MUTEX(&mddev->recovery_sem);
+ init_MUTEX(&mddev->resync_sem);
+ MD_INIT_LIST_HEAD(&mddev->disks);
+ MD_INIT_LIST_HEAD(&mddev->all_mddevs);
+
+ q = &mddev->queue;
+ blk_init_queue(q, DEVICE_REQUEST);
+ blk_queue_pluggable(q, md_plug_device);
+ blk_queue_make_request(q, md_make_request);
+
+ q->plug_tq.sync = 0;
+ q->plug_tq.routine = &md_unplug_device;
+ q->plug_tq.data = mddev;
/*
- * Read the superblock, it's at the end of the disk
+ * The 'base' mddev is the one with data NULL.
+ * personalities can create additional mddevs
+ * if necessary.
*/
- rdev->sb_offset = MD_NEW_SIZE_BLOCKS (blk_size[MAJOR(dev)][MINOR(dev)]);
- set_blocksize (dev, MD_SB_BYTES);
- bh = bread (dev, rdev->sb_offset / MD_SB_BLOCKS, MD_SB_BYTES);
+ add_mddev_mapping(mddev, dev, 0);
+ md_list_add(&mddev->all_mddevs, &all_mddevs);
- if (bh) {
- sb = (md_superblock_t *) bh->b_data;
- if (sb->md_magic != MD_SB_MAGIC) {
- printk (BAD_MAGIC, kdevname(dev),
- sb->md_magic, rdev->sb_offset);
- goto abort;
- }
- rdev->sb = (md_superblock_t *) __get_free_page(GFP_KERNEL);
- if (!rdev->sb) {
- printk (OUT_OF_MEM);
- goto abort;
- }
- memcpy (rdev->sb, bh->b_data, MD_SB_BYTES);
-
- rdev->size = sb->size;
- } else
- printk (NO_DEVICE,kdevname(rdev->dev));
- ret = SUCCESS;
-abort:
- if (bh)
- brelse (bh);
- return ret;
+ return mddev;
}
-#undef SUCCESS
-#undef FAILURE
+static void free_mddev (mddev_t *mddev)
+{
+ if (!mddev) {
+ MD_BUG();
+ return;
+ }
-#undef BAD_MAGIC
-#undef OUT_OF_MEM
-#undef NO_DEVICE
+ /*
+ * Make sure nobody else is using this mddev
+ * (careful, we rely on the global kernel lock here)
+ */
+ while (md_atomic_read(&mddev->resync_sem.count) != 1)
+ schedule();
+ while (md_atomic_read(&mddev->recovery_sem.count) != 1)
+ schedule();
-/*
- * Check a full RAID array for plausibility
- */
+ del_mddev_mapping(mddev, MKDEV(MD_MAJOR, mdidx(mddev)));
+ md_list_del(&mddev->all_mddevs);
+ MD_INIT_LIST_HEAD(&mddev->all_mddevs);
+ kfree(mddev);
+}
-#define INCONSISTENT KERN_ERR \
-"md: superblock inconsistency -- run ckraid\n"
+struct gendisk * find_gendisk (kdev_t dev)
+{
+ struct gendisk *tmp = gendisk_head;
-#define OUT_OF_DATE KERN_ERR \
-"md: superblock update time inconsistenty -- using the most recent one\n"
+ while (tmp != NULL) {
+ if (tmp->major == MAJOR(dev))
+ return (tmp);
+ tmp = tmp->next;
+ }
+ return (NULL);
+}
-#define OLD_VERSION KERN_ALERT \
-"md: %s: unsupported raid array version %d.%d.%d\n"
+mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr)
+{
+ mdk_rdev_t * rdev;
+ struct md_list_head *tmp;
+
+ ITERATE_RDEV(mddev,rdev,tmp) {
+ if (rdev->desc_nr == nr)
+ return rdev;
+ }
+ return NULL;
+}
-#define NOT_CLEAN KERN_ERR \
-"md: %s: raid array is not clean -- run ckraid\n"
+mdk_rdev_t * find_rdev(mddev_t * mddev, kdev_t dev)
+{
+ struct md_list_head *tmp;
+ mdk_rdev_t *rdev;
-#define NOT_CLEAN_IGNORE KERN_ERR \
-"md: %s: raid array is not clean -- reconstructing parity\n"
+ ITERATE_RDEV(mddev,rdev,tmp) {
+ if (rdev->dev == dev)
+ return rdev;
+ }
+ return NULL;
+}
-#define UNKNOWN_LEVEL KERN_ERR \
-"md: %s: unsupported raid level %d\n"
+static MD_LIST_HEAD(device_names);
-static int analyze_sbs (int minor, int pnum)
+char * partition_name (kdev_t dev)
{
- struct md_dev *mddev = md_dev + minor;
- int i, N = mddev->nb_dev, out_of_date = 0;
- struct real_dev * disks = mddev->devices;
- md_superblock_t *sb, *freshest = NULL;
+ struct gendisk *hd;
+ static char nomem [] = "<nomem>";
+ dev_name_t *dname;
+ struct md_list_head *tmp = device_names.next;
+ while (tmp != &device_names) {
+ dname = md_list_entry(tmp, dev_name_t, list);
+ if (dname->dev == dev)
+ return dname->name;
+ tmp = tmp->next;
+ }
+
+ dname = (dev_name_t *) kmalloc(sizeof(*dname), GFP_KERNEL);
+
+ if (!dname)
+ return nomem;
/*
- * RAID-0 and linear don't use a RAID superblock
+ * ok, add this new device name to the list
*/
- if (pnum == RAID0 >> PERSONALITY_SHIFT ||
- pnum == LINEAR >> PERSONALITY_SHIFT)
- return legacy_raid_sb (minor, pnum);
+ hd = find_gendisk (dev);
+
+ if (!hd)
+ sprintf (dname->name, "[dev %s]", kdevname(dev));
+ else
+ disk_name (hd, MINOR(dev), dname->name);
+
+ dname->dev = dev;
+ MD_INIT_LIST_HEAD(&dname->list);
+ md_list_add(&dname->list, &device_names);
+
+ return dname->name;
+}
+static unsigned int calc_dev_sboffset (kdev_t dev, mddev_t *mddev,
+ int persistent)
+{
+ unsigned int size = 0;
+
+ if (blk_size[MAJOR(dev)])
+ size = blk_size[MAJOR(dev)][MINOR(dev)];
+ if (persistent)
+ size = MD_NEW_SIZE_BLOCKS(size);
+ return size;
+}
+
+static unsigned int calc_dev_size (kdev_t dev, mddev_t *mddev, int persistent)
+{
+ unsigned int size;
+
+ size = calc_dev_sboffset(dev, mddev, persistent);
+ if (!mddev->sb) {
+ MD_BUG();
+ return size;
+ }
+ if (mddev->sb->chunk_size)
+ size &= ~(mddev->sb->chunk_size/1024 - 1);
+ return size;
+}
+
+static unsigned int zoned_raid_size (mddev_t *mddev)
+{
+ unsigned int mask;
+ mdk_rdev_t * rdev;
+ struct md_list_head *tmp;
+
+ if (!mddev->sb) {
+ MD_BUG();
+ return -EINVAL;
+ }
/*
- * Verify the RAID superblock on each real device
+ * do size and offset calculations.
*/
- for (i = 0; i < N; i++)
- if (analyze_one_sb(disks+i))
- goto abort;
+ mask = ~(mddev->sb->chunk_size/1024 - 1);
+
+ ITERATE_RDEV(mddev,rdev,tmp) {
+ rdev->size &= mask;
+ md_size[mdidx(mddev)] += rdev->size;
+ }
+ return 0;
+}
+
+/*
+ * We check wether all devices are numbered from 0 to nb_dev-1. The
+ * order is guaranteed even after device name changes.
+ *
+ * Some personalities (raid0, linear) use this. Personalities that
+ * provide data have to be able to deal with loss of individual
+ * disks, so they do their checking themselves.
+ */
+int md_check_ordering (mddev_t *mddev)
+{
+ int i, c;
+ mdk_rdev_t *rdev;
+ struct md_list_head *tmp;
/*
- * The superblock constant part has to be the same
- * for all disks in the array.
+ * First, all devices must be fully functional
*/
- sb = NULL;
- for (i = 0; i < N; i++) {
- if (!disks[i].sb)
- continue;
- if (!sb) {
- sb = disks[i].sb;
- continue;
- }
- if (memcmp(sb,
- disks[i].sb, MD_SB_GENERIC_CONSTANT_WORDS * 4)) {
- printk (INCONSISTENT);
+ ITERATE_RDEV(mddev,rdev,tmp) {
+ if (rdev->faulty) {
+ printk("md: md%d's device %s faulty, aborting.\n",
+ mdidx(mddev), partition_name(rdev->dev));
goto abort;
}
}
- /*
- * OK, we have all disks and the array is ready to run. Let's
- * find the freshest superblock, that one will be the superblock
- * that represents the whole array.
- */
- if ((sb = mddev->sb = (md_superblock_t *) __get_free_page (GFP_KERNEL)) == NULL)
+ c = 0;
+ ITERATE_RDEV(mddev,rdev,tmp) {
+ c++;
+ }
+ if (c != mddev->nb_dev) {
+ MD_BUG();
goto abort;
- freshest = NULL;
- for (i = 0; i < N; i++) {
- if (!disks[i].sb)
- continue;
- if (!freshest) {
- freshest = disks[i].sb;
- continue;
- }
- /*
- * Find the newest superblock version
- */
- if (disks[i].sb->utime != freshest->utime) {
- out_of_date = 1;
- if (disks[i].sb->utime > freshest->utime)
- freshest = disks[i].sb;
- }
}
- if (out_of_date)
- printk(OUT_OF_DATE);
- memcpy (sb, freshest, sizeof(*freshest));
-
- /*
- * Check if we can support this RAID array
- */
- if (sb->major_version != MD_MAJOR_VERSION ||
- sb->minor_version > MD_MINOR_VERSION) {
-
- printk (OLD_VERSION, kdevname(MKDEV(MD_MAJOR, minor)),
- sb->major_version, sb->minor_version,
- sb->patch_version);
+ if (mddev->nb_dev != mddev->sb->raid_disks) {
+ printk("md: md%d, array needs %d disks, has %d, aborting.\n",
+ mdidx(mddev), mddev->sb->raid_disks, mddev->nb_dev);
goto abort;
}
-
/*
- * We need to add this as a superblock option.
+ * Now the numbering check
*/
-#if SUPPORT_RECONSTRUCTION
- if (sb->state != (1 << MD_SB_CLEAN)) {
- if (sb->level == 1) {
- printk (NOT_CLEAN, kdevname(MKDEV(MD_MAJOR, minor)));
+ for (i = 0; i < mddev->nb_dev; i++) {
+ c = 0;
+ ITERATE_RDEV(mddev,rdev,tmp) {
+ if (rdev->desc_nr == i)
+ c++;
+ }
+ if (c == 0) {
+ printk("md: md%d, missing disk #%d, aborting.\n",
+ mdidx(mddev), i);
goto abort;
- } else
- printk (NOT_CLEAN_IGNORE, kdevname(MKDEV(MD_MAJOR, minor)));
- }
-#else
- if (sb->state != (1 << MD_SB_CLEAN)) {
- printk (NOT_CLEAN, kdevname(MKDEV(MD_MAJOR, minor)));
- goto abort;
- }
-#endif /* SUPPORT_RECONSTRUCTION */
-
- switch (sb->level) {
- case 1:
- md_size[minor] = sb->size;
- md_maxreadahead[minor] = MD_DEFAULT_DISK_READAHEAD;
- break;
- case 4:
- case 5:
- md_size[minor] = sb->size * (sb->raid_disks - 1);
- md_maxreadahead[minor] = MD_DEFAULT_DISK_READAHEAD * (sb->raid_disks - 1);
- break;
- default:
- printk (UNKNOWN_LEVEL, kdevname(MKDEV(MD_MAJOR, minor)),
- sb->level);
+ }
+ if (c > 1) {
+ printk("md: md%d, too many disks #%d, aborting.\n",
+ mdidx(mddev), i);
goto abort;
+ }
}
return 0;
abort:
- free_sb(mddev);
return 1;
}
-#undef INCONSISTENT
-#undef OUT_OF_DATE
-#undef OLD_VERSION
-#undef NOT_CLEAN
-#undef OLD_LEVEL
-
-int md_update_sb(int minor)
+static void remove_descriptor (mdp_disk_t *disk, mdp_super_t *sb)
{
- struct md_dev *mddev = md_dev + minor;
- struct buffer_head *bh;
- md_superblock_t *sb = mddev->sb;
- struct real_dev *realdev;
- kdev_t dev;
- int i;
- u32 sb_offset;
+ if (disk_active(disk)) {
+ sb->working_disks--;
+ } else {
+ if (disk_spare(disk)) {
+ sb->spare_disks--;
+ sb->working_disks--;
+ } else {
+ sb->failed_disks--;
+ }
+ }
+ sb->nr_disks--;
+ disk->major = 0;
+ disk->minor = 0;
+ mark_disk_removed(disk);
+}
- sb->utime = CURRENT_TIME;
- for (i = 0; i < mddev->nb_dev; i++) {
- realdev = mddev->devices + i;
- if (!realdev->sb)
- continue;
- dev = realdev->dev;
- sb_offset = realdev->sb_offset;
- set_blocksize(dev, MD_SB_BYTES);
- printk("md: updating raid superblock on device %s, sb_offset == %u\n", kdevname(dev), sb_offset);
- bh = getblk(dev, sb_offset / MD_SB_BLOCKS, MD_SB_BYTES);
- if (bh) {
- sb = (md_superblock_t *) bh->b_data;
- memcpy(sb, mddev->sb, MD_SB_BYTES);
- memcpy(&sb->descriptor, sb->disks + realdev->sb->descriptor.number, MD_SB_DESCRIPTOR_WORDS * 4);
- mark_buffer_uptodate(bh, 1);
- mark_buffer_dirty(bh, 1);
- ll_rw_block(WRITE, 1, &bh);
- wait_on_buffer(bh);
- bforget(bh);
- fsync_dev(dev);
- invalidate_buffers(dev);
- } else
- printk(KERN_ERR "md: getblk failed for device %s\n", kdevname(dev));
+#define BAD_MAGIC KERN_ERR \
+"md: invalid raid superblock magic on %s\n"
+
+#define BAD_MINOR KERN_ERR \
+"md: %s: invalid raid minor (%x)\n"
+
+#define OUT_OF_MEM KERN_ALERT \
+"md: out of memory.\n"
+
+#define NO_SB KERN_ERR \
+"md: disabled device %s, could not read superblock.\n"
+
+#define BAD_CSUM KERN_WARNING \
+"md: invalid superblock checksum on %s\n"
+
+static int alloc_array_sb (mddev_t * mddev)
+{
+ if (mddev->sb) {
+ MD_BUG();
+ return 0;
}
+
+ mddev->sb = (mdp_super_t *) __get_free_page (GFP_KERNEL);
+ if (!mddev->sb)
+ return -ENOMEM;
+ md_clear_page((unsigned long)mddev->sb);
return 0;
}
-static int do_md_run (int minor, int repart)
+static int alloc_disk_sb (mdk_rdev_t * rdev)
{
- int pnum, i, min, factor, err;
+ if (rdev->sb)
+ MD_BUG();
- if (!md_dev[minor].nb_dev)
- return -EINVAL;
-
- if (md_dev[minor].pers)
- return -EBUSY;
-
- md_dev[minor].repartition=repart;
-
- if ((pnum=PERSONALITY(&md_dev[minor]) >> (PERSONALITY_SHIFT))
- >= MAX_PERSONALITY)
- return -EINVAL;
-
- /* Only RAID-1 and RAID-5 can have MD devices as underlying devices */
- if (pnum != (RAID1 >> PERSONALITY_SHIFT) && pnum != (RAID5 >> PERSONALITY_SHIFT)){
- for (i = 0; i < md_dev [minor].nb_dev; i++)
- if (MAJOR (md_dev [minor].devices [i].dev) == MD_MAJOR)
- return -EINVAL;
- }
- if (!pers[pnum])
- {
-#ifdef CONFIG_KMOD
- char module_name[80];
- sprintf (module_name, "md-personality-%d", pnum);
- request_module (module_name);
- if (!pers[pnum])
-#endif
- return -EINVAL;
- }
-
- factor = min = 1 << FACTOR_SHIFT(FACTOR((md_dev+minor)));
-
- for (i=0; i<md_dev[minor].nb_dev; i++)
- if (md_dev[minor].devices[i].size<min)
- {
- printk ("Dev %s smaller than %dk, cannot shrink\n",
- partition_name (md_dev[minor].devices[i].dev), min);
- return -EINVAL;
- }
-
- for (i=0; i<md_dev[minor].nb_dev; i++) {
- fsync_dev(md_dev[minor].devices[i].dev);
- invalidate_buffers(md_dev[minor].devices[i].dev);
- }
-
- /* Resize devices according to the factor. It is used to align
- partitions size on a given chunk size. */
- md_size[minor]=0;
-
- /*
- * Analyze the raid superblock
- */
- if (analyze_sbs(minor, pnum))
- return -EINVAL;
+ rdev->sb = (mdp_super_t *) __get_free_page(GFP_KERNEL);
+ if (!rdev->sb) {
+ printk (OUT_OF_MEM);
+ return -EINVAL;
+ }
+ md_clear_page((unsigned long)rdev->sb);
- md_dev[minor].pers=pers[pnum];
-
- if ((err=md_dev[minor].pers->run (minor, md_dev+minor)))
- {
- md_dev[minor].pers=NULL;
- free_sb(md_dev + minor);
- return (err);
- }
-
- if (pnum != RAID0 >> PERSONALITY_SHIFT && pnum != LINEAR >> PERSONALITY_SHIFT)
- {
- md_dev[minor].sb->state &= ~(1 << MD_SB_CLEAN);
- md_update_sb(minor);
- }
-
- /* FIXME : We assume here we have blocks
- that are twice as large as sectors.
- THIS MAY NOT BE TRUE !!! */
- md_hd_struct[minor].start_sect=0;
- md_hd_struct[minor].nr_sects=md_size[minor]<<1;
-
- read_ahead[MD_MAJOR] = 128;
- return (0);
+ return 0;
}
-static int do_md_stop (int minor, struct inode *inode)
+static void free_disk_sb (mdk_rdev_t * rdev)
{
- int i;
-
- if (inode->i_count>1 || md_dev[minor].busy>1) {
- /*
- * ioctl : one open channel
- */
- printk ("STOP_MD md%x failed : i_count=%d, busy=%d\n",
- minor, inode->i_count, md_dev[minor].busy);
- return -EBUSY;
- }
-
- if (md_dev[minor].pers) {
- /*
- * It is safe to call stop here, it only frees private
- * data. Also, it tells us if a device is unstoppable
- * (eg. resyncing is in progress)
- */
- if (md_dev[minor].pers->stop (minor, md_dev+minor))
- return -EBUSY;
- /*
- * The device won't exist anymore -> flush it now
- */
- fsync_dev (inode->i_rdev);
- invalidate_buffers (inode->i_rdev);
- if (md_dev[minor].sb) {
- md_dev[minor].sb->state |= 1 << MD_SB_CLEAN;
- md_update_sb(minor);
- }
+ if (rdev->sb) {
+ free_page((unsigned long) rdev->sb);
+ rdev->sb = NULL;
+ rdev->sb_offset = 0;
+ rdev->size = 0;
+ } else {
+ if (!rdev->faulty)
+ MD_BUG();
}
-
- /* Remove locks. */
- if (md_dev[minor].sb)
- free_sb(md_dev + minor);
- for (i=0; i<md_dev[minor].nb_dev; i++)
- clear_inode (md_dev[minor].devices[i].inode);
-
- md_dev[minor].nb_dev=md_size[minor]=0;
- md_hd_struct[minor].nr_sects=0;
- md_dev[minor].pers=NULL;
-
- read_ahead[MD_MAJOR] = 128;
-
- return (0);
}
-static int do_md_add (int minor, kdev_t dev)
+static void mark_rdev_faulty (mdk_rdev_t * rdev)
{
- int i;
- int hot_add=0;
- struct real_dev *realdev;
+ if (!rdev) {
+ MD_BUG();
+ return;
+ }
+ free_disk_sb(rdev);
+ rdev->faulty = 1;
+}
- if (md_dev[minor].nb_dev==MAX_REAL)
- return -EINVAL;
+static int read_disk_sb (mdk_rdev_t * rdev)
+{
+ int ret = -EINVAL;
+ struct buffer_head *bh = NULL;
+ kdev_t dev = rdev->dev;
+ mdp_super_t *sb;
+ u32 sb_offset;
- if (!fs_may_mount (dev))
+ if (!rdev->sb) {
+ MD_BUG();
+ goto abort;
+ }
+
+ /*
+ * Calculate the position of the superblock,
+ * it's at the end of the disk
+ */
+ sb_offset = calc_dev_sboffset(rdev->dev, rdev->mddev, 1);
+ rdev->sb_offset = sb_offset;
+ printk("(read) %s's sb offset: %d", partition_name(dev),
+ sb_offset);
+ fsync_dev(dev);
+ set_blocksize (dev, MD_SB_BYTES);
+ bh = bread (dev, sb_offset / MD_SB_BLOCKS, MD_SB_BYTES);
+
+ if (bh) {
+ sb = (mdp_super_t *) bh->b_data;
+ memcpy (rdev->sb, sb, MD_SB_BYTES);
+ } else {
+ printk (NO_SB,partition_name(rdev->dev));
+ goto abort;
+ }
+ printk(" [events: %08lx]\n", (unsigned long)get_unaligned(&rdev->sb->events));
+ ret = 0;
+abort:
+ if (bh)
+ brelse (bh);
+ return ret;
+}
+
+static unsigned int calc_sb_csum (mdp_super_t * sb)
+{
+ unsigned int disk_csum, csum;
+
+ disk_csum = sb->sb_csum;
+ sb->sb_csum = 0;
+ csum = csum_partial((void *)sb, MD_SB_BYTES, 0);
+ sb->sb_csum = disk_csum;
+ return csum;
+}
+
+/*
+ * Check one RAID superblock for generic plausibility
+ */
+
+static int check_disk_sb (mdk_rdev_t * rdev)
+{
+ mdp_super_t *sb;
+ int ret = -EINVAL;
+
+ sb = rdev->sb;
+ if (!sb) {
+ MD_BUG();
+ goto abort;
+ }
+
+ if (sb->md_magic != MD_SB_MAGIC) {
+ printk (BAD_MAGIC, partition_name(rdev->dev));
+ goto abort;
+ }
+
+ if (sb->md_minor >= MAX_MD_DEVS) {
+ printk (BAD_MINOR, partition_name(rdev->dev),
+ sb->md_minor);
+ goto abort;
+ }
+
+ if (calc_sb_csum(sb) != sb->sb_csum)
+ printk(BAD_CSUM, partition_name(rdev->dev));
+ ret = 0;
+abort:
+ return ret;
+}
+
+static kdev_t dev_unit(kdev_t dev)
+{
+ unsigned int mask;
+ struct gendisk *hd = find_gendisk(dev);
+
+ if (!hd)
+ return 0;
+ mask = ~((1 << hd->minor_shift) - 1);
+
+ return MKDEV(MAJOR(dev), MINOR(dev) & mask);
+}
+
+static mdk_rdev_t * match_dev_unit(mddev_t *mddev, kdev_t dev)
+{
+ struct md_list_head *tmp;
+ mdk_rdev_t *rdev;
+
+ ITERATE_RDEV(mddev,rdev,tmp)
+ if (dev_unit(rdev->dev) == dev_unit(dev))
+ return rdev;
+
+ return NULL;
+}
+
+static MD_LIST_HEAD(all_raid_disks);
+static MD_LIST_HEAD(pending_raid_disks);
+
+static void bind_rdev_to_array (mdk_rdev_t * rdev, mddev_t * mddev)
+{
+ mdk_rdev_t *same_pdev;
+
+ if (rdev->mddev) {
+ MD_BUG();
+ return;
+ }
+ same_pdev = match_dev_unit(mddev, rdev->dev);
+ if (same_pdev)
+ printk( KERN_WARNING
+"md%d: WARNING: %s appears to be on the same physical disk as %s. True\n"
+" protection against single-disk failure might be compromised.\n",
+ mdidx(mddev), partition_name(rdev->dev),
+ partition_name(same_pdev->dev));
+
+ md_list_add(&rdev->same_set, &mddev->disks);
+ rdev->mddev = mddev;
+ mddev->nb_dev++;
+ printk("bind<%s,%d>\n", partition_name(rdev->dev), mddev->nb_dev);
+}
+
+static void unbind_rdev_from_array (mdk_rdev_t * rdev)
+{
+ if (!rdev->mddev) {
+ MD_BUG();
+ return;
+ }
+ md_list_del(&rdev->same_set);
+ MD_INIT_LIST_HEAD(&rdev->same_set);
+ rdev->mddev->nb_dev--;
+ printk("unbind<%s,%d>\n", partition_name(rdev->dev),
+ rdev->mddev->nb_dev);
+ rdev->mddev = NULL;
+}
+
+/*
+ * prevent the device from being mounted, repartitioned or
+ * otherwise reused by a RAID array (or any other kernel
+ * subsystem), by opening the device. [simply getting an
+ * inode is not enough, the SCSI module usage code needs
+ * an explicit open() on the device]
+ */
+static int lock_rdev (mdk_rdev_t *rdev)
+{
+ int err = 0;
+
+ /*
+ * First insert a dummy inode.
+ */
+ if (rdev->inode)
+ MD_BUG();
+ rdev->inode = get_empty_inode();
+ if (!rdev->inode)
+ return -ENOMEM;
+ /*
+ * we dont care about any other fields
+ */
+ rdev->inode->i_dev = rdev->inode->i_rdev = rdev->dev;
+ insert_inode_hash(rdev->inode);
+
+ memset(&rdev->filp, 0, sizeof(rdev->filp));
+ rdev->filp.f_mode = 3; /* read write */
+ return err;
+}
+
+static void unlock_rdev (mdk_rdev_t *rdev)
+{
+ if (!rdev->inode)
+ MD_BUG();
+ iput(rdev->inode);
+ rdev->inode = NULL;
+}
+
+static void export_rdev (mdk_rdev_t * rdev)
+{
+ printk("export_rdev(%s)\n",partition_name(rdev->dev));
+ if (rdev->mddev)
+ MD_BUG();
+ unlock_rdev(rdev);
+ free_disk_sb(rdev);
+ md_list_del(&rdev->all);
+ MD_INIT_LIST_HEAD(&rdev->all);
+ if (rdev->pending.next != &rdev->pending) {
+ printk("(%s was pending)\n",partition_name(rdev->dev));
+ md_list_del(&rdev->pending);
+ MD_INIT_LIST_HEAD(&rdev->pending);
+ }
+ rdev->dev = 0;
+ rdev->faulty = 0;
+ kfree(rdev);
+}
+
+static void kick_rdev_from_array (mdk_rdev_t * rdev)
+{
+ unbind_rdev_from_array(rdev);
+ export_rdev(rdev);
+}
+
+static void export_array (mddev_t *mddev)
+{
+ struct md_list_head *tmp;
+ mdk_rdev_t *rdev;
+ mdp_super_t *sb = mddev->sb;
+
+ if (mddev->sb) {
+ mddev->sb = NULL;
+ free_page((unsigned long) sb);
+ }
+
+ ITERATE_RDEV(mddev,rdev,tmp) {
+ if (!rdev->mddev) {
+ MD_BUG();
+ continue;
+ }
+ kick_rdev_from_array(rdev);
+ }
+ if (mddev->nb_dev)
+ MD_BUG();
+}
+
+#undef BAD_CSUM
+#undef BAD_MAGIC
+#undef OUT_OF_MEM
+#undef NO_SB
+
+static void print_desc(mdp_disk_t *desc)
+{
+ printk(" DISK<N:%d,%s(%d,%d),R:%d,S:%d>\n", desc->number,
+ partition_name(MKDEV(desc->major,desc->minor)),
+ desc->major,desc->minor,desc->raid_disk,desc->state);
+}
+
+static void print_sb(mdp_super_t *sb)
+{
+ int i;
+
+ printk(" SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
+ sb->major_version, sb->minor_version, sb->patch_version,
+ sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3,
+ sb->ctime);
+ printk(" L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n", sb->level,
+ sb->size, sb->nr_disks, sb->raid_disks, sb->md_minor,
+ sb->layout, sb->chunk_size);
+ printk(" UT:%08x ST:%d AD:%d WD:%d FD:%d SD:%d CSUM:%08x E:%08lx\n",
+ sb->utime, sb->state, sb->active_disks, sb->working_disks,
+ sb->failed_disks, sb->spare_disks,
+ sb->sb_csum, (unsigned long)get_unaligned(&sb->events));
+
+ for (i = 0; i < MD_SB_DISKS; i++) {
+ mdp_disk_t *desc;
+
+ desc = sb->disks + i;
+ printk(" D %2d: ", i);
+ print_desc(desc);
+ }
+ printk(" THIS: ");
+ print_desc(&sb->this_disk);
+
+}
+
+static void print_rdev(mdk_rdev_t *rdev)
+{
+ printk(" rdev %s: O:%s, SZ:%08d F:%d DN:%d ",
+ partition_name(rdev->dev), partition_name(rdev->old_dev),
+ rdev->size, rdev->faulty, rdev->desc_nr);
+ if (rdev->sb) {
+ printk("rdev superblock:\n");
+ print_sb(rdev->sb);
+ } else
+ printk("no rdev superblock!\n");
+}
+
+void md_print_devices (void)
+{
+ struct md_list_head *tmp, *tmp2;
+ mdk_rdev_t *rdev;
+ mddev_t *mddev;
+
+ printk("\n");
+ printk(" **********************************\n");
+ printk(" * <COMPLETE RAID STATE PRINTOUT> *\n");
+ printk(" **********************************\n");
+ ITERATE_MDDEV(mddev,tmp) {
+ printk("md%d: ", mdidx(mddev));
+
+ ITERATE_RDEV(mddev,rdev,tmp2)
+ printk("<%s>", partition_name(rdev->dev));
+
+ if (mddev->sb) {
+ printk(" array superblock:\n");
+ print_sb(mddev->sb);
+ } else
+ printk(" no array superblock.\n");
+
+ ITERATE_RDEV(mddev,rdev,tmp2)
+ print_rdev(rdev);
+ }
+ printk(" **********************************\n");
+ printk("\n");
+}
+
+static int sb_equal ( mdp_super_t *sb1, mdp_super_t *sb2)
+{
+ int ret;
+ mdp_super_t *tmp1, *tmp2;
+
+ tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
+ tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
+
+ if (!tmp1 || !tmp2) {
+ ret = 0;
+ goto abort;
+ }
+
+ *tmp1 = *sb1;
+ *tmp2 = *sb2;
+
+ /*
+ * nr_disks is not constant
+ */
+ tmp1->nr_disks = 0;
+ tmp2->nr_disks = 0;
+
+ if (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4))
+ ret = 0;
+ else
+ ret = 1;
+
+abort:
+ if (tmp1)
+ kfree(tmp1);
+ if (tmp2)
+ kfree(tmp2);
+
+ return ret;
+}
+
+static int uuid_equal(mdk_rdev_t *rdev1, mdk_rdev_t *rdev2)
+{
+ if ( (rdev1->sb->set_uuid0 == rdev2->sb->set_uuid0) &&
+ (rdev1->sb->set_uuid1 == rdev2->sb->set_uuid1) &&
+ (rdev1->sb->set_uuid2 == rdev2->sb->set_uuid2) &&
+ (rdev1->sb->set_uuid3 == rdev2->sb->set_uuid3))
+
+ return 1;
+
+ return 0;
+}
+
+static mdk_rdev_t * find_rdev_all (kdev_t dev)
+{
+ struct md_list_head *tmp;
+ mdk_rdev_t *rdev;
+
+ tmp = all_raid_disks.next;
+ while (tmp != &all_raid_disks) {
+ rdev = md_list_entry(tmp, mdk_rdev_t, all);
+ if (rdev->dev == dev)
+ return rdev;
+ tmp = tmp->next;
+ }
+ return NULL;
+}
+
+#define GETBLK_FAILED KERN_ERR \
+"md: getblk failed for device %s\n"
+
+static int write_disk_sb(mdk_rdev_t * rdev)
+{
+ struct buffer_head *bh;
+ kdev_t dev;
+ u32 sb_offset, size;
+ mdp_super_t *sb;
+
+ if (!rdev->sb) {
+ MD_BUG();
+ return -1;
+ }
+ if (rdev->faulty) {
+ MD_BUG();
+ return -1;
+ }
+ if (rdev->sb->md_magic != MD_SB_MAGIC) {
+ MD_BUG();
+ return -1;
+ }
+
+ dev = rdev->dev;
+ sb_offset = calc_dev_sboffset(dev, rdev->mddev, 1);
+ if (rdev->sb_offset != sb_offset) {
+ printk("%s's sb offset has changed from %d to %d, skipping\n", partition_name(dev), rdev->sb_offset, sb_offset);
+ goto skip;
+ }
+ /*
+ * If the disk went offline meanwhile and it's just a spare, then
+ * it's size has changed to zero silently, and the MD code does
+ * not yet know that it's faulty.
+ */
+ size = calc_dev_size(dev, rdev->mddev, 1);
+ if (size != rdev->size) {
+ printk("%s's size has changed from %d to %d since import, skipping\n", partition_name(dev), rdev->size, size);
+ goto skip;
+ }
+
+ printk("(write) %s's sb offset: %d\n", partition_name(dev), sb_offset);
+ fsync_dev(dev);
+ set_blocksize(dev, MD_SB_BYTES);
+ bh = getblk(dev, sb_offset / MD_SB_BLOCKS, MD_SB_BYTES);
+ if (!bh) {
+ printk(GETBLK_FAILED, partition_name(dev));
+ return 1;
+ }
+ memset(bh->b_data,0,bh->b_size);
+ sb = (mdp_super_t *) bh->b_data;
+ memcpy(sb, rdev->sb, MD_SB_BYTES);
+
+ mark_buffer_uptodate(bh, 1);
+ mark_buffer_dirty(bh, 1);
+ ll_rw_block(WRITE, 1, &bh);
+ wait_on_buffer(bh);
+ brelse(bh);
+ fsync_dev(dev);
+skip:
+ return 0;
+}
+#undef GETBLK_FAILED KERN_ERR
+
+static void set_this_disk(mddev_t *mddev, mdk_rdev_t *rdev)
+{
+ int i, ok = 0;
+ mdp_disk_t *desc;
+
+ for (i = 0; i < MD_SB_DISKS; i++) {
+ desc = mddev->sb->disks + i;
+#if 0
+ if (disk_faulty(desc)) {
+ if (MKDEV(desc->major,desc->minor) == rdev->dev)
+ ok = 1;
+ continue;
+ }
+#endif
+ if (MKDEV(desc->major,desc->minor) == rdev->dev) {
+ rdev->sb->this_disk = *desc;
+ rdev->desc_nr = desc->number;
+ ok = 1;
+ break;
+ }
+ }
+
+ if (!ok) {
+ MD_BUG();
+ }
+}
+
+static int sync_sbs(mddev_t * mddev)
+{
+ mdk_rdev_t *rdev;
+ mdp_super_t *sb;
+ struct md_list_head *tmp;
+
+ ITERATE_RDEV(mddev,rdev,tmp) {
+ if (rdev->faulty)
+ continue;
+ sb = rdev->sb;
+ *sb = *mddev->sb;
+ set_this_disk(mddev, rdev);
+ sb->sb_csum = calc_sb_csum(sb);
+ }
+ return 0;
+}
+
+int md_update_sb(mddev_t * mddev)
+{
+ int first, err, count = 100;
+ struct md_list_head *tmp;
+ mdk_rdev_t *rdev;
+ __u64 ev;
+
+repeat:
+ mddev->sb->utime = CURRENT_TIME;
+ ev = get_unaligned(&mddev->sb->events);
+ ++ev;
+ put_unaligned(ev,&mddev->sb->events);
+ if (ev == (__u64)0) {
+ /*
+ * oops, this 64-bit counter should never wrap.
+ * Either we are in around ~1 trillion A.C., assuming
+ * 1 reboot per second, or we have a bug:
+ */
+ MD_BUG();
+ --ev;
+ put_unaligned(ev,&mddev->sb->events);
+ }
+ sync_sbs(mddev);
+
+ /*
+ * do not write anything to disk if using
+ * nonpersistent superblocks
+ */
+ if (mddev->sb->not_persistent)
+ return 0;
+
+ printk(KERN_INFO "md: updating md%d RAID superblock on device\n",
+ mdidx(mddev));
+
+ first = 1;
+ err = 0;
+ ITERATE_RDEV(mddev,rdev,tmp) {
+ if (!first) {
+ first = 0;
+ printk(", ");
+ }
+ if (rdev->faulty)
+ printk("(skipping faulty ");
+ printk("%s ", partition_name(rdev->dev));
+ if (!rdev->faulty) {
+ printk("[events: %08lx]",
+ (unsigned long)get_unaligned(&rdev->sb->events));
+ err += write_disk_sb(rdev);
+ } else
+ printk(")\n");
+ }
+ printk(".\n");
+ if (err) {
+ printk("errors occured during superblock update, repeating\n");
+ if (--count)
+ goto repeat;
+ printk("excessive errors occured during superblock update, exiting\n");
+ }
+ return 0;
+}
+
+/*
+ * Import a device. If 'on_disk', then sanity check the superblock
+ *
+ * mark the device faulty if:
+ *
+ * - the device is nonexistent (zero size)
+ * - the device has no valid superblock
+ *
+ * a faulty rdev _never_ has rdev->sb set.
+ */
+static int md_import_device (kdev_t newdev, int on_disk)
+{
+ int err;
+ mdk_rdev_t *rdev;
+ unsigned int size;
+
+ if (find_rdev_all(newdev))
+ return -EEXIST;
+
+ rdev = (mdk_rdev_t *) kmalloc(sizeof(*rdev), GFP_KERNEL);
+ if (!rdev) {
+ printk("could not alloc mem for %s!\n", partition_name(newdev));
+ return -ENOMEM;
+ }
+ memset(rdev, 0, sizeof(*rdev));
+
+ if (!fs_may_mount(newdev)) {
+ printk("md: can not import %s, has active inodes!\n",
+ partition_name(newdev));
+ err = -EBUSY;
+ goto abort_free;
+ }
+
+ if ((err = alloc_disk_sb(rdev)))
+ goto abort_free;
+
+ rdev->dev = newdev;
+ if (lock_rdev(rdev)) {
+ printk("md: could not lock %s, zero-size? Marking faulty.\n",
+ partition_name(newdev));
+ err = -EINVAL;
+ goto abort_free;
+ }
+ rdev->desc_nr = -1;
+ rdev->faulty = 0;
+
+ size = 0;
+ if (blk_size[MAJOR(newdev)])
+ size = blk_size[MAJOR(newdev)][MINOR(newdev)];
+ if (!size) {
+ printk("md: %s has zero size, marking faulty!\n",
+ partition_name(newdev));
+ err = -EINVAL;
+ goto abort_free;
+ }
+
+ if (on_disk) {
+ if ((err = read_disk_sb(rdev))) {
+ printk("md: could not read %s's sb, not importing!\n",
+ partition_name(newdev));
+ goto abort_free;
+ }
+ if ((err = check_disk_sb(rdev))) {
+ printk("md: %s has invalid sb, not importing!\n",
+ partition_name(newdev));
+ goto abort_free;
+ }
+
+ rdev->old_dev = MKDEV(rdev->sb->this_disk.major,
+ rdev->sb->this_disk.minor);
+ rdev->desc_nr = rdev->sb->this_disk.number;
+ }
+ md_list_add(&rdev->all, &all_raid_disks);
+ MD_INIT_LIST_HEAD(&rdev->pending);
+
+ if (rdev->faulty && rdev->sb)
+ free_disk_sb(rdev);
+ return 0;
+
+abort_free:
+ if (rdev->sb) {
+ if (rdev->inode)
+ unlock_rdev(rdev);
+ free_disk_sb(rdev);
+ }
+ kfree(rdev);
+ return err;
+}
+
+/*
+ * Check a full RAID array for plausibility
+ */
+
+#define INCONSISTENT KERN_ERR \
+"md: fatal superblock inconsistency in %s -- removing from array\n"
+
+#define OUT_OF_DATE KERN_ERR \
+"md: superblock update time inconsistency -- using the most recent one\n"
+
+#define OLD_VERSION KERN_ALERT \
+"md: md%d: unsupported raid array version %d.%d.%d\n"
+
+#define NOT_CLEAN_IGNORE KERN_ERR \
+"md: md%d: raid array is not clean -- starting background reconstruction\n"
+
+#define UNKNOWN_LEVEL KERN_ERR \
+"md: md%d: unsupported raid level %d\n"
+
+static int analyze_sbs (mddev_t * mddev)
+{
+ int out_of_date = 0, i;
+ struct md_list_head *tmp, *tmp2;
+ mdk_rdev_t *rdev, *rdev2, *freshest;
+ mdp_super_t *sb;
+
+ /*
+ * Verify the RAID superblock on each real device
+ */
+ ITERATE_RDEV(mddev,rdev,tmp) {
+ if (rdev->faulty) {
+ MD_BUG();
+ goto abort;
+ }
+ if (!rdev->sb) {
+ MD_BUG();
+ goto abort;
+ }
+ if (check_disk_sb(rdev))
+ goto abort;
+ }
+
+ /*
+ * The superblock constant part has to be the same
+ * for all disks in the array.
+ */
+ sb = NULL;
+
+ ITERATE_RDEV(mddev,rdev,tmp) {
+ if (!sb) {
+ sb = rdev->sb;
+ continue;
+ }
+ if (!sb_equal(sb, rdev->sb)) {
+ printk (INCONSISTENT, partition_name(rdev->dev));
+ kick_rdev_from_array(rdev);
+ continue;
+ }
+ }
+
+ /*
+ * OK, we have all disks and the array is ready to run. Let's
+ * find the freshest superblock, that one will be the superblock
+ * that represents the whole array.
+ */
+ if (!mddev->sb)
+ if (alloc_array_sb(mddev))
+ goto abort;
+ sb = mddev->sb;
+ freshest = NULL;
+
+ ITERATE_RDEV(mddev,rdev,tmp) {
+ __u64 ev1, ev2;
+ /*
+ * if the checksum is invalid, use the superblock
+ * only as a last resort. (decrease it's age by
+ * one event)
+ */
+ if (calc_sb_csum(rdev->sb) != rdev->sb->sb_csum) {
+ __u64 ev = get_unaligned(&rdev->sb->events);
+ if (ev != (__u64)0) {
+ --ev;
+ put_unaligned(ev,&rdev->sb->events);
+ }
+ }
+
+ printk("%s's event counter: %08lx\n", partition_name(rdev->dev),
+ (unsigned long)get_unaligned(&rdev->sb->events));
+ if (!freshest) {
+ freshest = rdev;
+ continue;
+ }
+ /*
+ * Find the newest superblock version
+ */
+ ev1 = get_unaligned(&rdev->sb->events);
+ ev2 = get_unaligned(&freshest->sb->events);
+ if (ev1 != ev2) {
+ out_of_date = 1;
+ if (ev1 > ev2)
+ freshest = rdev;
+ }
+ }
+ if (out_of_date) {
+ printk(OUT_OF_DATE);
+ printk("freshest: %s\n", partition_name(freshest->dev));
+ }
+ memcpy (sb, freshest->sb, sizeof(*sb));
+
+ /*
+ * at this point we have picked the 'best' superblock
+ * from all available superblocks.
+ * now we validate this superblock and kick out possibly
+ * failed disks.
+ */
+ ITERATE_RDEV(mddev,rdev,tmp) {
+ /*
+ * Kick all non-fresh devices faulty
+ */
+ __u64 ev1, ev2;
+ ev1 = get_unaligned(&rdev->sb->events);
+ ev2 = get_unaligned(&sb->events);
+ ++ev1;
+ if (ev1 < ev2) {
+ printk("md: kicking non-fresh %s from array!\n",
+ partition_name(rdev->dev));
+ kick_rdev_from_array(rdev);
+ continue;
+ }
+ }
+
+ /*
+ * Fix up changed device names ... but only if this disk has a
+ * recent update time. Use faulty checksum ones too.
+ */
+ ITERATE_RDEV(mddev,rdev,tmp) {
+ __u64 ev1, ev2, ev3;
+ if (rdev->faulty) { /* REMOVEME */
+ MD_BUG();
+ goto abort;
+ }
+ ev1 = get_unaligned(&rdev->sb->events);
+ ev2 = get_unaligned(&sb->events);
+ ev3 = ev2;
+ --ev3;
+ if ((rdev->dev != rdev->old_dev) &&
+ ((ev1 == ev2) || (ev1 == ev3))) {
+ mdp_disk_t *desc;
+
+ printk("md: device name has changed from %s to %s since last import!\n", partition_name(rdev->old_dev), partition_name(rdev->dev));
+ if (rdev->desc_nr == -1) {
+ MD_BUG();
+ goto abort;
+ }
+ desc = &sb->disks[rdev->desc_nr];
+ if (rdev->old_dev != MKDEV(desc->major, desc->minor)) {
+ MD_BUG();
+ goto abort;
+ }
+ desc->major = MAJOR(rdev->dev);
+ desc->minor = MINOR(rdev->dev);
+ desc = &rdev->sb->this_disk;
+ desc->major = MAJOR(rdev->dev);
+ desc->minor = MINOR(rdev->dev);
+ }
+ }
+
+ /*
+ * Remove unavailable and faulty devices ...
+ *
+ * note that if an array becomes completely unrunnable due to
+ * missing devices, we do not write the superblock back, so the
+ * administrator has a chance to fix things up. The removal thus
+ * only happens if it's nonfatal to the contents of the array.
+ */
+ for (i = 0; i < MD_SB_DISKS; i++) {
+ int found;
+ mdp_disk_t *desc;
+ kdev_t dev;
+
+ desc = sb->disks + i;
+ dev = MKDEV(desc->major, desc->minor);
+
+ /*
+ * We kick faulty devices/descriptors immediately.
+ */
+ if (disk_faulty(desc)) {
+ found = 0;
+ ITERATE_RDEV(mddev,rdev,tmp) {
+ if (rdev->desc_nr != desc->number)
+ continue;
+ printk("md%d: kicking faulty %s!\n",
+ mdidx(mddev),partition_name(rdev->dev));
+ kick_rdev_from_array(rdev);
+ found = 1;
+ break;
+ }
+ if (!found) {
+ if (dev == MKDEV(0,0))
+ continue;
+ printk("md%d: removing former faulty %s!\n",
+ mdidx(mddev), partition_name(dev));
+ }
+ remove_descriptor(desc, sb);
+ continue;
+ }
+
+ if (dev == MKDEV(0,0))
+ continue;
+ /*
+ * Is this device present in the rdev ring?
+ */
+ found = 0;
+ ITERATE_RDEV(mddev,rdev,tmp) {
+ if (rdev->desc_nr == desc->number) {
+ found = 1;
+ break;
+ }
+ }
+ if (found)
+ continue;
+
+ printk("md%d: former device %s is unavailable, removing from array!\n", mdidx(mddev), partition_name(dev));
+ remove_descriptor(desc, sb);
+ }
+
+ /*
+ * Double check wether all devices mentioned in the
+ * superblock are in the rdev ring.
+ */
+ for (i = 0; i < MD_SB_DISKS; i++) {
+ mdp_disk_t *desc;
+ kdev_t dev;
+
+ desc = sb->disks + i;
+ dev = MKDEV(desc->major, desc->minor);
+
+ if (dev == MKDEV(0,0))
+ continue;
+
+ if (disk_faulty(desc)) {
+ MD_BUG();
+ goto abort;
+ }
+
+ rdev = find_rdev(mddev, dev);
+ if (!rdev) {
+ MD_BUG();
+ goto abort;
+ }
+ }
+
+ /*
+ * Do a final reality check.
+ */
+ ITERATE_RDEV(mddev,rdev,tmp) {
+ if (rdev->desc_nr == -1) {
+ MD_BUG();
+ goto abort;
+ }
+ /*
+ * is the desc_nr unique?
+ */
+ ITERATE_RDEV(mddev,rdev2,tmp2) {
+ if ((rdev2 != rdev) &&
+ (rdev2->desc_nr == rdev->desc_nr)) {
+ MD_BUG();
+ goto abort;
+ }
+ }
+ /*
+ * is the device unique?
+ */
+ ITERATE_RDEV(mddev,rdev2,tmp2) {
+ if ((rdev2 != rdev) &&
+ (rdev2->dev == rdev->dev)) {
+ MD_BUG();
+ goto abort;
+ }
+ }
+ }
+
+ /*
+ * Check if we can support this RAID array
+ */
+ if (sb->major_version != MD_MAJOR_VERSION ||
+ sb->minor_version > MD_MINOR_VERSION) {
+
+ printk (OLD_VERSION, mdidx(mddev), sb->major_version,
+ sb->minor_version, sb->patch_version);
+ goto abort;
+ }
+
+ if ((sb->state != (1 << MD_SB_CLEAN)) && ((sb->level == 1) ||
+ (sb->level == 4) || (sb->level == 5)))
+ printk (NOT_CLEAN_IGNORE, mdidx(mddev));
+
+ return 0;
+abort:
+ return 1;
+}
+
+#undef INCONSISTENT
+#undef OUT_OF_DATE
+#undef OLD_VERSION
+#undef OLD_LEVEL
+
+static int device_size_calculation (mddev_t * mddev)
+{
+ int data_disks = 0, persistent;
+ unsigned int readahead;
+ mdp_super_t *sb = mddev->sb;
+ struct md_list_head *tmp;
+ mdk_rdev_t *rdev;
+
+ /*
+ * Do device size calculation. Bail out if too small.
+ * (we have to do this after having validated chunk_size,
+ * because device size has to be modulo chunk_size)
+ */
+ persistent = !mddev->sb->not_persistent;
+ ITERATE_RDEV(mddev,rdev,tmp) {
+ if (rdev->faulty)
+ continue;
+ if (rdev->size) {
+ MD_BUG();
+ continue;
+ }
+ rdev->size = calc_dev_size(rdev->dev, mddev, persistent);
+ if (rdev->size < sb->chunk_size / 1024) {
+ printk (KERN_WARNING
+ "Dev %s smaller than chunk_size: %dk < %dk\n",
+ partition_name(rdev->dev),
+ rdev->size, sb->chunk_size / 1024);
+ return -EINVAL;
+ }
+ }
+
+ switch (sb->level) {
+ case -3:
+ data_disks = 1;
+ break;
+ case -2:
+ data_disks = 1;
+ break;
+ case -1:
+ zoned_raid_size(mddev);
+ data_disks = 1;
+ break;
+ case 0:
+ zoned_raid_size(mddev);
+ data_disks = sb->raid_disks;
+ break;
+ case 1:
+ data_disks = 1;
+ break;
+ case 4:
+ case 5:
+ data_disks = sb->raid_disks-1;
+ break;
+ default:
+ printk (UNKNOWN_LEVEL, mdidx(mddev), sb->level);
+ goto abort;
+ }
+ if (!md_size[mdidx(mddev)])
+ md_size[mdidx(mddev)] = sb->size * data_disks;
+
+ readahead = MD_READAHEAD;
+ if ((sb->level == 0) || (sb->level == 4) || (sb->level == 5))
+ readahead = mddev->sb->chunk_size * 4 * data_disks;
+ if (readahead < data_disks * MAX_SECTORS*512*2)
+ readahead = data_disks * MAX_SECTORS*512*2;
+ else {
+ if (sb->level == -3)
+ readahead = 0;
+ }
+ md_maxreadahead[mdidx(mddev)] = readahead;
+
+ printk(KERN_INFO "md%d: max total readahead window set to %dk\n",
+ mdidx(mddev), readahead/1024);
+
+ printk(KERN_INFO
+ "md%d: %d data-disks, max readahead per data-disk: %dk\n",
+ mdidx(mddev), data_disks, readahead/data_disks/1024);
+ return 0;
+abort:
+ return 1;
+}
+
+
+#define TOO_BIG_CHUNKSIZE KERN_ERR \
+"too big chunk_size: %d > %d\n"
+
+#define TOO_SMALL_CHUNKSIZE KERN_ERR \
+"too small chunk_size: %d < %ld\n"
+
+#define BAD_CHUNKSIZE KERN_ERR \
+"no chunksize specified, see 'man raidtab'\n"
+
+static int do_md_run (mddev_t * mddev)
+{
+ int pnum, err;
+ int chunk_size;
+ struct md_list_head *tmp;
+ mdk_rdev_t *rdev;
+
+
+ if (!mddev->nb_dev) {
+ MD_BUG();
+ return -EINVAL;
+ }
+
+ if (mddev->pers)
+ return -EBUSY;
+
+ /*
+ * Resize disks to align partitions size on a given
+ * chunk size.
+ */
+ md_size[mdidx(mddev)] = 0;
+
+ /*
+ * Analyze all RAID superblock(s)
+ */
+ if (analyze_sbs(mddev)) {
+ MD_BUG();
+ return -EINVAL;
+ }
+
+ chunk_size = mddev->sb->chunk_size;
+ pnum = level_to_pers(mddev->sb->level);
+
+ mddev->param.chunk_size = chunk_size;
+ mddev->param.personality = pnum;
+
+ if (chunk_size > MAX_CHUNK_SIZE) {
+ printk(TOO_BIG_CHUNKSIZE, chunk_size, MAX_CHUNK_SIZE);
+ return -EINVAL;
+ }
+ /*
+ * chunk-size has to be a power of 2 and multiples of PAGE_SIZE
+ */
+ if ( (1 << ffz(~chunk_size)) != chunk_size) {
+ MD_BUG();
+ return -EINVAL;
+ }
+ if (chunk_size < PAGE_SIZE) {
+ printk(TOO_SMALL_CHUNKSIZE, chunk_size, PAGE_SIZE);
+ return -EINVAL;
+ }
+
+ if (pnum >= MAX_PERSONALITY) {
+ MD_BUG();
+ return -EINVAL;
+ }
+
+ if ((pnum != RAID1) && (pnum != LINEAR) && !chunk_size) {
+ /*
+ * 'default chunksize' in the old md code used to
+ * be PAGE_SIZE, baaad.
+ * we abort here to be on the safe side. We dont
+ * want to continue the bad practice.
+ */
+ printk(BAD_CHUNKSIZE);
+ return -EINVAL;
+ }
+
+ if (!pers[pnum])
+ {
+#ifdef CONFIG_KMOD
+ char module_name[80];
+ sprintf (module_name, "md-personality-%d", pnum);
+ request_module (module_name);
+ if (!pers[pnum])
+#endif
+ return -EINVAL;
+ }
+
+ if (device_size_calculation(mddev))
+ return -EINVAL;
+
+ /*
+ * Drop all container device buffers, from now on
+ * the only valid external interface is through the md
+ * device.
+ */
+ ITERATE_RDEV(mddev,rdev,tmp) {
+ if (rdev->faulty)
+ continue;
+ fsync_dev(rdev->dev);
+ invalidate_buffers(rdev->dev);
+ }
+
+ mddev->pers = pers[pnum];
+
+ err = mddev->pers->run(mddev);
+ if (err) {
+ printk("pers->run() failed ...\n");
+ mddev->pers = NULL;
+ return -EINVAL;
+ }
+
+ mddev->sb->state &= ~(1 << MD_SB_CLEAN);
+ md_update_sb(mddev);
+
+ /*
+ * md_size has units of 1K blocks, which are
+ * twice as large as sectors.
+ */
+ md_hd_struct[mdidx(mddev)].start_sect = 0;
+ md_hd_struct[mdidx(mddev)].nr_sects = md_size[mdidx(mddev)] << 1;
+
+ read_ahead[MD_MAJOR] = 1024;
+ return (0);
+}
+
+#undef TOO_BIG_CHUNKSIZE
+#undef BAD_CHUNKSIZE
+
+#define OUT(x) do { err = (x); goto out; } while (0)
+
+static int restart_array (mddev_t *mddev)
+{
+ int err = 0;
+
+ /*
+ * Complain if it has no devices
+ */
+ if (!mddev->nb_dev)
+ OUT(-ENXIO);
+
+ if (mddev->pers) {
+ if (!mddev->ro)
+ OUT(-EBUSY);
+
+ mddev->ro = 0;
+ set_device_ro(mddev_to_kdev(mddev), 0);
+
+ printk (KERN_INFO
+ "md%d switched to read-write mode.\n", mdidx(mddev));
+ /*
+ * Kick recovery or resync if necessary
+ */
+ md_recover_arrays();
+ if (mddev->pers->restart_resync)
+ mddev->pers->restart_resync(mddev);
+ } else
+ err = -EINVAL;
+
+out:
+ return err;
+}
+
+#define STILL_MOUNTED KERN_WARNING \
+"md: md%d still mounted.\n"
+
+static int do_md_stop (mddev_t * mddev, int ro)
+{
+ int err = 0, resync_interrupted = 0;
+ kdev_t dev = mddev_to_kdev(mddev);
+
+ if (!ro && !fs_may_mount (dev)) {
+ printk (STILL_MOUNTED, mdidx(mddev));
+ OUT(-EBUSY);
+ }
+
+ /*
+ * complain if it's already stopped
+ */
+ if (!mddev->nb_dev)
+ OUT(-ENXIO);
+
+ if (mddev->pers) {
+ /*
+ * It is safe to call stop here, it only frees private
+ * data. Also, it tells us if a device is unstoppable
+ * (eg. resyncing is in progress)
+ */
+ if (mddev->pers->stop_resync)
+ if (mddev->pers->stop_resync(mddev))
+ resync_interrupted = 1;
+
+ if (mddev->recovery_running)
+ md_interrupt_thread(md_recovery_thread);
+
+ /*
+ * This synchronizes with signal delivery to the
+ * resync or reconstruction thread. It also nicely
+ * hangs the process if some reconstruction has not
+ * finished.
+ */
+ down(&mddev->recovery_sem);
+ up(&mddev->recovery_sem);
+
+ /*
+ * sync and invalidate buffers because we cannot kill the
+ * main thread with valid IO transfers still around.
+ * the kernel lock protects us from new requests being
+ * added after invalidate_buffers().
+ */
+ fsync_dev (mddev_to_kdev(mddev));
+ fsync_dev (dev);
+ invalidate_buffers (dev);
+
+ if (ro) {
+ if (mddev->ro)
+ OUT(-ENXIO);
+ mddev->ro = 1;
+ } else {
+ if (mddev->ro)
+ set_device_ro(dev, 0);
+ if (mddev->pers->stop(mddev)) {
+ if (mddev->ro)
+ set_device_ro(dev, 1);
+ OUT(-EBUSY);
+ }
+ if (mddev->ro)
+ mddev->ro = 0;
+ }
+ if (mddev->sb) {
+ /*
+ * mark it clean only if there was no resync
+ * interrupted.
+ */
+ if (!mddev->recovery_running && !resync_interrupted) {
+ printk("marking sb clean...\n");
+ mddev->sb->state |= 1 << MD_SB_CLEAN;
+ }
+ md_update_sb(mddev);
+ }
+ if (ro)
+ set_device_ro(dev, 1);
+ }
+
+ /*
+ * Free resources if final stop
+ */
+ if (!ro) {
+ export_array(mddev);
+ md_size[mdidx(mddev)] = 0;
+ md_hd_struct[mdidx(mddev)].nr_sects = 0;
+ free_mddev(mddev);
+
+ printk (KERN_INFO "md%d stopped.\n", mdidx(mddev));
+ } else
+ printk (KERN_INFO
+ "md%d switched to read-only mode.\n", mdidx(mddev));
+out:
+ return err;
+}
+
+#undef OUT
+
+/*
+ * We have to safely support old arrays too.
+ */
+int detect_old_array (mdp_super_t *sb)
+{
+ if (sb->major_version > 0)
+ return 0;
+ if (sb->minor_version >= 90)
+ return 0;
+
+ return -EINVAL;
+}
+
+
+static void autorun_array (mddev_t *mddev)
+{
+ mdk_rdev_t *rdev;
+ struct md_list_head *tmp;
+ int err;
+
+ if (mddev->disks.prev == &mddev->disks) {
+ MD_BUG();
+ return;
+ }
+
+ printk("running: ");
+
+ ITERATE_RDEV(mddev,rdev,tmp) {
+ printk("<%s>", partition_name(rdev->dev));
+ }
+ printk("\nnow!\n");
+
+ err = do_md_run (mddev);
+ if (err) {
+ printk("do_md_run() returned %d\n", err);
+ /*
+ * prevent the writeback of an unrunnable array
+ */
+ mddev->sb_dirty = 0;
+ do_md_stop (mddev, 0);
+ }
+}
+
+/*
+ * lets try to run arrays based on all disks that have arrived
+ * until now. (those are in the ->pending list)
+ *
+ * the method: pick the first pending disk, collect all disks with
+ * the same UUID, remove all from the pending list and put them into
+ * the 'same_array' list. Then order this list based on superblock
+ * update time (freshest comes first), kick out 'old' disks and
+ * compare superblocks. If everything's fine then run it.
+ */
+static void autorun_devices (void)
+{
+ struct md_list_head candidates;
+ struct md_list_head *tmp;
+ mdk_rdev_t *rdev0, *rdev;
+ mddev_t *mddev;
+ kdev_t md_kdev;
+
+
+ printk("autorun ...\n");
+ while (pending_raid_disks.next != &pending_raid_disks) {
+ rdev0 = md_list_entry(pending_raid_disks.next,
+ mdk_rdev_t, pending);
+
+ printk("considering %s ...\n", partition_name(rdev0->dev));
+ MD_INIT_LIST_HEAD(&candidates);
+ ITERATE_RDEV_PENDING(rdev,tmp) {
+ if (uuid_equal(rdev0, rdev)) {
+ if (!sb_equal(rdev0->sb, rdev->sb)) {
+ printk("%s has same UUID as %s, but superblocks differ ...\n", partition_name(rdev->dev), partition_name(rdev0->dev));
+ continue;
+ }
+ printk(" adding %s ...\n", partition_name(rdev->dev));
+ md_list_del(&rdev->pending);
+ md_list_add(&rdev->pending, &candidates);
+ }
+ }
+ /*
+ * now we have a set of devices, with all of them having
+ * mostly sane superblocks. It's time to allocate the
+ * mddev.
+ */
+ md_kdev = MKDEV(MD_MAJOR, rdev0->sb->md_minor);
+ mddev = kdev_to_mddev(md_kdev);
+ if (mddev) {
+ printk("md%d already running, cannot run %s\n",
+ mdidx(mddev), partition_name(rdev0->dev));
+ ITERATE_RDEV_GENERIC(candidates,pending,rdev,tmp)
+ export_rdev(rdev);
+ continue;
+ }
+ mddev = alloc_mddev(md_kdev);
+ printk("created md%d\n", mdidx(mddev));
+ ITERATE_RDEV_GENERIC(candidates,pending,rdev,tmp) {
+ bind_rdev_to_array(rdev, mddev);
+ md_list_del(&rdev->pending);
+ MD_INIT_LIST_HEAD(&rdev->pending);
+ }
+ autorun_array(mddev);
+ }
+ printk("... autorun DONE.\n");
+}
+
+/*
+ * import RAID devices based on one partition
+ * if possible, the array gets run as well.
+ */
+
+#define BAD_VERSION KERN_ERR \
+"md: %s has RAID superblock version 0.%d, autodetect needs v0.90 or higher\n"
+
+#define OUT_OF_MEM KERN_ALERT \
+"md: out of memory.\n"
+
+#define NO_DEVICE KERN_ERR \
+"md: disabled device %s\n"
+
+#define AUTOADD_FAILED KERN_ERR \
+"md: auto-adding devices to md%d FAILED (error %d).\n"
+
+#define AUTOADD_FAILED_USED KERN_ERR \
+"md: cannot auto-add device %s to md%d, already used.\n"
+
+#define AUTORUN_FAILED KERN_ERR \
+"md: auto-running md%d FAILED (error %d).\n"
+
+#define MDDEV_BUSY KERN_ERR \
+"md: cannot auto-add to md%d, already running.\n"
+
+#define AUTOADDING KERN_INFO \
+"md: auto-adding devices to md%d, based on %s's superblock.\n"
+
+#define AUTORUNNING KERN_INFO \
+"md: auto-running md%d.\n"
+
+static int autostart_array (kdev_t startdev)
+{
+ int err = -EINVAL, i;
+ mdp_super_t *sb = NULL;
+ mdk_rdev_t *start_rdev = NULL, *rdev;
+
+ if (md_import_device(startdev, 1)) {
+ printk("could not import %s!\n", partition_name(startdev));
+ goto abort;
+ }
+
+ start_rdev = find_rdev_all(startdev);
+ if (!start_rdev) {
+ MD_BUG();
+ goto abort;
+ }
+ if (start_rdev->faulty) {
+ printk("can not autostart based on faulty %s!\n",
+ partition_name(startdev));
+ goto abort;
+ }
+ md_list_add(&start_rdev->pending, &pending_raid_disks);
+
+ sb = start_rdev->sb;
+
+ err = detect_old_array(sb);
+ if (err) {
+ printk("array version is too old to be autostarted, use raidtools 0.90 mkraid --upgrade\nto upgrade the array without data loss!\n");
+ goto abort;
+ }
+
+ for (i = 0; i < MD_SB_DISKS; i++) {
+ mdp_disk_t *desc;
+ kdev_t dev;
+
+ desc = sb->disks + i;
+ dev = MKDEV(desc->major, desc->minor);
+
+ if (dev == MKDEV(0,0))
+ continue;
+ if (dev == startdev)
+ continue;
+ if (md_import_device(dev, 1)) {
+ printk("could not import %s, trying to run array nevertheless.\n", partition_name(dev));
+ continue;
+ }
+ rdev = find_rdev_all(dev);
+ if (!rdev) {
+ MD_BUG();
+ goto abort;
+ }
+ md_list_add(&rdev->pending, &pending_raid_disks);
+ }
+
+ /*
+ * possibly return codes
+ */
+ autorun_devices();
+ return 0;
+
+abort:
+ if (start_rdev)
+ export_rdev(start_rdev);
+ return err;
+}
+
+#undef BAD_VERSION
+#undef OUT_OF_MEM
+#undef NO_DEVICE
+#undef AUTOADD_FAILED_USED
+#undef AUTOADD_FAILED
+#undef AUTORUN_FAILED
+#undef AUTOADDING
+#undef AUTORUNNING
+
+struct {
+ int set;
+ int noautodetect;
+
+} raid_setup_args md__initdata = { 0, 0 };
+
+/*
+ * Searches all registered partitions for autorun RAID arrays
+ * at boot time.
+ */
+void md__init autodetect_raid(void)
+{
+#ifdef CONFIG_AUTODETECT_RAID
+ struct gendisk *disk;
+ mdk_rdev_t *rdev;
+ int i;
+
+ if (raid_setup_args.noautodetect) {
+ printk(KERN_INFO "skipping autodetection of RAID arrays\n");
+ return;
+ }
+ printk(KERN_INFO "autodetecting RAID arrays\n");
+
+ for (disk = gendisk_head ; disk ; disk = disk->next) {
+ for (i = 0; i < disk->max_p*disk->nr_real; i++) {
+ kdev_t dev = MKDEV(disk->major,i);
+
+ if (disk->part[i].type != LINUX_RAID_PARTITION)
+ continue;
+
+ if (md_import_device(dev,1)) {
+ printk(KERN_ALERT "could not import %s!\n",
+ partition_name(dev));
+ continue;
+ }
+ /*
+ * Sanity checks:
+ */
+ rdev = find_rdev_all(dev);
+ if (!rdev) {
+ MD_BUG();
+ continue;
+ }
+ if (rdev->faulty) {
+ MD_BUG();
+ continue;
+ }
+ md_list_add(&rdev->pending, &pending_raid_disks);
+ }
+ }
+
+ autorun_devices();
+#endif
+}
+
+static int get_version (void * arg)
+{
+ mdu_version_t ver;
+
+ ver.major = MD_MAJOR_VERSION;
+ ver.minor = MD_MINOR_VERSION;
+ ver.patchlevel = MD_PATCHLEVEL_VERSION;
+
+ if (md_copy_to_user(arg, &ver, sizeof(ver)))
+ return -EFAULT;
+
+ return 0;
+}
+
+#define SET_FROM_SB(x) info.x = mddev->sb->x
+static int get_array_info (mddev_t * mddev, void * arg)
+{
+ mdu_array_info_t info;
+
+ if (!mddev->sb)
+ return -EINVAL;
+
+ SET_FROM_SB(major_version);
+ SET_FROM_SB(minor_version);
+ SET_FROM_SB(patch_version);
+ SET_FROM_SB(ctime);
+ SET_FROM_SB(level);
+ SET_FROM_SB(size);
+ SET_FROM_SB(nr_disks);
+ SET_FROM_SB(raid_disks);
+ SET_FROM_SB(md_minor);
+ SET_FROM_SB(not_persistent);
+
+ SET_FROM_SB(utime);
+ SET_FROM_SB(state);
+ SET_FROM_SB(active_disks);
+ SET_FROM_SB(working_disks);
+ SET_FROM_SB(failed_disks);
+ SET_FROM_SB(spare_disks);
+
+ SET_FROM_SB(layout);
+ SET_FROM_SB(chunk_size);
+
+ if (md_copy_to_user(arg, &info, sizeof(info)))
+ return -EFAULT;
+
+ return 0;
+}
+#undef SET_FROM_SB
+
+#define SET_FROM_SB(x) info.x = mddev->sb->disks[nr].x
+static int get_disk_info (mddev_t * mddev, void * arg)
+{
+ mdu_disk_info_t info;
+ unsigned int nr;
+
+ if (!mddev->sb)
+ return -EINVAL;
+
+ if (md_copy_from_user(&info, arg, sizeof(info)))
+ return -EFAULT;
+
+ nr = info.number;
+ if (nr >= mddev->sb->nr_disks)
+ return -EINVAL;
+
+ SET_FROM_SB(major);
+ SET_FROM_SB(minor);
+ SET_FROM_SB(raid_disk);
+ SET_FROM_SB(state);
+
+ if (md_copy_to_user(arg, &info, sizeof(info)))
+ return -EFAULT;
+
+ return 0;
+}
+#undef SET_FROM_SB
+
+#define SET_SB(x) mddev->sb->disks[nr].x = info.x
+
+static int add_new_disk (mddev_t * mddev, void * arg)
+{
+ int err, size, persistent;
+ mdu_disk_info_t info;
+ mdk_rdev_t *rdev;
+ unsigned int nr;
+ kdev_t dev;
+
+ if (!mddev->sb)
+ return -EINVAL;
+
+ if (md_copy_from_user(&info, arg, sizeof(info)))
+ return -EFAULT;
+
+ nr = info.number;
+ if (nr >= mddev->sb->nr_disks)
+ return -EINVAL;
+
+ dev = MKDEV(info.major,info.minor);
+
+ if (find_rdev_all(dev)) {
+ printk("device %s already used in a RAID array!\n",
+ partition_name(dev));
+ return -EBUSY;
+ }
+
+ SET_SB(number);
+ SET_SB(major);
+ SET_SB(minor);
+ SET_SB(raid_disk);
+ SET_SB(state);
+
+ if ((info.state & (1<<MD_DISK_FAULTY))==0) {
+ err = md_import_device (dev, 0);
+ if (err) {
+ printk("md: error, md_import_device() returned %d\n", err);
+ return -EINVAL;
+ }
+ rdev = find_rdev_all(dev);
+ if (!rdev) {
+ MD_BUG();
+ return -EINVAL;
+ }
+
+ rdev->old_dev = dev;
+ rdev->desc_nr = info.number;
+
+ bind_rdev_to_array(rdev, mddev);
+
+ persistent = !mddev->sb->not_persistent;
+ if (!persistent)
+ printk("nonpersistent superblock ...\n");
+ if (!mddev->sb->chunk_size)
+ printk("no chunksize?\n");
+
+ size = calc_dev_size(dev, mddev, persistent);
+ rdev->sb_offset = calc_dev_sboffset(dev, mddev, persistent);
+
+ if (!mddev->sb->size || (mddev->sb->size > size))
+ mddev->sb->size = size;
+ }
+
+ /*
+ * sync all other superblocks with the main superblock
+ */
+ sync_sbs(mddev);
+
+ return 0;
+}
+#undef SET_SB
+
+static int hot_remove_disk (mddev_t * mddev, kdev_t dev)
+{
+ int err;
+ mdk_rdev_t *rdev;
+ mdp_disk_t *disk;
+
+ if (!mddev->pers)
+ return -ENODEV;
+
+ printk("trying to remove %s from md%d ... \n",
+ partition_name(dev), mdidx(mddev));
+
+ if (!mddev->pers->diskop) {
+ printk("md%d: personality does not support diskops!\n",
+ mdidx(mddev));
+ return -EINVAL;
+ }
+
+ rdev = find_rdev(mddev, dev);
+ if (!rdev)
+ return -ENXIO;
+
+ if (rdev->desc_nr == -1) {
+ MD_BUG();
+ return -EINVAL;
+ }
+ disk = &mddev->sb->disks[rdev->desc_nr];
+ if (disk_active(disk))
+ goto busy;
+ if (disk_removed(disk)) {
+ MD_BUG();
+ return -EINVAL;
+ }
+
+ err = mddev->pers->diskop(mddev, &disk, DISKOP_HOT_REMOVE_DISK);
+ if (err == -EBUSY)
+ goto busy;
+ if (err) {
+ MD_BUG();
+ return -EINVAL;
+ }
+
+ remove_descriptor(disk, mddev->sb);
+ kick_rdev_from_array(rdev);
+ mddev->sb_dirty = 1;
+ md_update_sb(mddev);
+
+ return 0;
+busy:
+ printk("cannot remove active disk %s from md%d ... \n",
+ partition_name(dev), mdidx(mddev));
+ return -EBUSY;
+}
+
+static int hot_add_disk (mddev_t * mddev, kdev_t dev)
+{
+ int i, err, persistent;
+ unsigned int size;
+ mdk_rdev_t *rdev;
+ mdp_disk_t *disk;
+
+ if (!mddev->pers)
+ return -ENODEV;
+
+ printk("trying to hot-add %s to md%d ... \n",
+ partition_name(dev), mdidx(mddev));
+
+ if (!mddev->pers->diskop) {
+ printk("md%d: personality does not support diskops!\n",
+ mdidx(mddev));
+ return -EINVAL;
+ }
+
+ persistent = !mddev->sb->not_persistent;
+ size = calc_dev_size(dev, mddev, persistent);
+
+ if (size < mddev->sb->size) {
+ printk("md%d: disk size %d blocks < array size %d\n",
+ mdidx(mddev), size, mddev->sb->size);
+ return -ENOSPC;
+ }
+
+ rdev = find_rdev(mddev, dev);
+ if (rdev)
+ return -EBUSY;
+
+ err = md_import_device (dev, 0);
+ if (err) {
+ printk("md: error, md_import_device() returned %d\n", err);
+ return -EINVAL;
+ }
+ rdev = find_rdev_all(dev);
+ if (!rdev) {
+ MD_BUG();
+ return -EINVAL;
+ }
+ if (rdev->faulty) {
+ printk("md: can not hot-add faulty %s disk to md%d!\n",
+ partition_name(dev), mdidx(mddev));
+ err = -EINVAL;
+ goto abort_export;
+ }
+ bind_rdev_to_array(rdev, mddev);
+
+ /*
+ * The rest should better be atomic, we can have disk failures
+ * noticed in interrupt contexts ...
+ */
+ rdev->old_dev = dev;
+ rdev->size = size;
+ rdev->sb_offset = calc_dev_sboffset(dev, mddev, persistent);
+
+ disk = mddev->sb->disks + mddev->sb->raid_disks;
+ for (i = mddev->sb->raid_disks; i < MD_SB_DISKS; i++) {
+ disk = mddev->sb->disks + i;
+
+ if (!disk->major && !disk->minor)
+ break;
+ if (disk_removed(disk))
+ break;
+ }
+ if (i == MD_SB_DISKS) {
+ printk("md%d: can not hot-add to full array!\n", mdidx(mddev));
+ err = -EBUSY;
+ goto abort_unbind_export;
+ }
+
+ if (disk_removed(disk)) {
+ /*
+ * reuse slot
+ */
+ if (disk->number != i) {
+ MD_BUG();
+ err = -EINVAL;
+ goto abort_unbind_export;
+ }
+ } else {
+ disk->number = i;
+ }
+
+ disk->raid_disk = disk->number;
+ disk->major = MAJOR(dev);
+ disk->minor = MINOR(dev);
+
+ if (mddev->pers->diskop(mddev, &disk, DISKOP_HOT_ADD_DISK)) {
+ MD_BUG();
+ err = -EINVAL;
+ goto abort_unbind_export;
+ }
+
+ mark_disk_spare(disk);
+ mddev->sb->nr_disks++;
+ mddev->sb->spare_disks++;
+ mddev->sb->working_disks++;
+
+ mddev->sb_dirty = 1;
+
+ md_update_sb(mddev);
+
+ /*
+ * Kick recovery, maybe this spare has to be added to the
+ * array immediately.
+ */
+ md_recover_arrays();
+
+ return 0;
+
+abort_unbind_export:
+ unbind_rdev_from_array(rdev);
+
+abort_export:
+ export_rdev(rdev);
+ return err;
+}
+
+#define SET_SB(x) mddev->sb->x = info.x
+static int set_array_info (mddev_t * mddev, void * arg)
+{
+ mdu_array_info_t info;
+
+ if (mddev->sb) {
+ printk("array md%d already has a superblock!\n",
+ mdidx(mddev));
return -EBUSY;
+ }
+
+ if (md_copy_from_user(&info, arg, sizeof(info)))
+ return -EFAULT;
+
+ if (alloc_array_sb(mddev))
+ return -ENOMEM;
+
+ mddev->sb->major_version = MD_MAJOR_VERSION;
+ mddev->sb->minor_version = MD_MINOR_VERSION;
+ mddev->sb->patch_version = MD_PATCHLEVEL_VERSION;
+ mddev->sb->ctime = CURRENT_TIME;
+
+ SET_SB(level);
+ SET_SB(size);
+ SET_SB(nr_disks);
+ SET_SB(raid_disks);
+ SET_SB(md_minor);
+ SET_SB(not_persistent);
+
+ SET_SB(state);
+ SET_SB(active_disks);
+ SET_SB(working_disks);
+ SET_SB(failed_disks);
+ SET_SB(spare_disks);
+
+ SET_SB(layout);
+ SET_SB(chunk_size);
+
+ mddev->sb->md_magic = MD_SB_MAGIC;
+
+ /*
+ * Generate a 128 bit UUID
+ */
+ get_random_bytes(&mddev->sb->set_uuid0, 4);
+ get_random_bytes(&mddev->sb->set_uuid1, 4);
+ get_random_bytes(&mddev->sb->set_uuid2, 4);
+ get_random_bytes(&mddev->sb->set_uuid3, 4);
+
+ return 0;
+}
+#undef SET_SB
+
+static int set_disk_info (mddev_t * mddev, void * arg)
+{
+ printk("not yet");
+ return -EINVAL;
+}
+
+static int clear_array (mddev_t * mddev)
+{
+ printk("not yet");
+ return -EINVAL;
+}
+
+static int write_raid_info (mddev_t * mddev)
+{
+ printk("not yet");
+ return -EINVAL;
+}
+
+static int protect_array (mddev_t * mddev)
+{
+ printk("not yet");
+ return -EINVAL;
+}
+
+static int unprotect_array (mddev_t * mddev)
+{
+ printk("not yet");
+ return -EINVAL;
+}
+
+static int set_disk_faulty (mddev_t *mddev, kdev_t dev)
+{
+ int ret;
+
+ fsync_dev(mddev_to_kdev(mddev));
+ ret = md_error(mddev_to_kdev(mddev), dev);
+ return ret;
+}
+
+static int md_ioctl (struct inode *inode, struct file *file,
+ unsigned int cmd, unsigned long arg)
+{
+ unsigned int minor;
+ int err = 0;
+ struct hd_geometry *loc = (struct hd_geometry *) arg;
+ mddev_t *mddev = NULL;
+ kdev_t dev;
+
+ if (!md_capable_admin())
+ return -EACCES;
+
+ dev = inode->i_rdev;
+ minor = MINOR(dev);
+ if (minor >= MAX_MD_DEVS)
+ return -EINVAL;
+
+ /*
+ * Commands dealing with the RAID driver but not any
+ * particular array:
+ */
+ switch (cmd)
+ {
+ case RAID_VERSION:
+ err = get_version((void *)arg);
+ goto done;
+
+ case PRINT_RAID_DEBUG:
+ err = 0;
+ md_print_devices();
+ goto done_unlock;
+
+ case BLKGETSIZE: /* Return device size */
+ if (!arg) {
+ err = -EINVAL;
+ goto abort;
+ }
+ err = md_put_user(md_hd_struct[minor].nr_sects,
+ (long *) arg);
+ goto done;
+
+ case BLKFLSBUF:
+ fsync_dev(dev);
+ invalidate_buffers(dev);
+ goto done;
+
+ case BLKRASET:
+ if (arg > 0xff) {
+ err = -EINVAL;
+ goto abort;
+ }
+ read_ahead[MAJOR(dev)] = arg;
+ goto done;
+
+ case BLKRAGET:
+ if (!arg) {
+ err = -EINVAL;
+ goto abort;
+ }
+ err = md_put_user (read_ahead[
+ MAJOR(dev)], (long *) arg);
+ goto done;
+ default:
+ }
+
+ /*
+ * Commands creating/starting a new array:
+ */
+
+ mddev = kdev_to_mddev(dev);
+
+ switch (cmd)
+ {
+ case SET_ARRAY_INFO:
+ case START_ARRAY:
+ if (mddev) {
+ printk("array md%d already exists!\n",
+ mdidx(mddev));
+ err = -EEXIST;
+ goto abort;
+ }
+ default:
+ }
+
+ switch (cmd)
+ {
+ case SET_ARRAY_INFO:
+ mddev = alloc_mddev(dev);
+ if (!mddev) {
+ err = -ENOMEM;
+ goto abort;
+ }
+ /*
+ * alloc_mddev() should possibly self-lock.
+ */
+ err = lock_mddev(mddev);
+ if (err) {
+ printk("ioctl, reason %d, cmd %d\n", err, cmd);
+ goto abort;
+ }
+ err = set_array_info(mddev, (void *)arg);
+ if (err) {
+ printk("couldnt set array info. %d\n", err);
+ goto abort;
+ }
+ goto done_unlock;
+
+ case START_ARRAY:
+ /*
+ * possibly make it lock the array ...
+ */
+ err = autostart_array((kdev_t)arg);
+ if (err) {
+ printk("autostart %s failed!\n",
+ partition_name((kdev_t)arg));
+ goto abort;
+ }
+ goto done;
+
+ default:
+ }
+
+ /*
+ * Commands querying/configuring an existing array:
+ */
- if (blk_size[MAJOR(dev)] == NULL || blk_size[MAJOR(dev)][MINOR(dev)] == 0) {
- printk("md_add(): zero device size, huh, bailing out.\n");
- return -EINVAL;
+ if (!mddev) {
+ err = -ENODEV;
+ goto abort;
+ }
+ err = lock_mddev(mddev);
+ if (err) {
+ printk("ioctl lock interrupted, reason %d, cmd %d\n",err, cmd);
+ goto abort;
}
- if (md_dev[minor].pers) {
- /*
- * The array is already running, hot-add the drive, or
- * bail out:
- */
- if (!md_dev[minor].pers->hot_add_disk)
- return -EBUSY;
- else
- hot_add=1;
+ /*
+ * Commands even a read-only array can execute:
+ */
+ switch (cmd)
+ {
+ case GET_ARRAY_INFO:
+ err = get_array_info(mddev, (void *)arg);
+ goto done_unlock;
+
+ case GET_DISK_INFO:
+ err = get_disk_info(mddev, (void *)arg);
+ goto done_unlock;
+
+ case RESTART_ARRAY_RW:
+ err = restart_array(mddev);
+ goto done_unlock;
+
+ case STOP_ARRAY:
+ err = do_md_stop (mddev, 0);
+ goto done_unlock;
+
+ case STOP_ARRAY_RO:
+ err = do_md_stop (mddev, 1);
+ goto done_unlock;
+
+ /*
+ * We have a problem here : there is no easy way to give a CHS
+ * virtual geometry. We currently pretend that we have a 2 heads
+ * 4 sectors (with a BIG number of cylinders...). This drives
+ * dosfs just mad... ;-)
+ */
+ case HDIO_GETGEO:
+ if (!loc) {
+ err = -EINVAL;
+ goto abort_unlock;
+ }
+ err = md_put_user (2, (char *) &loc->heads);
+ if (err)
+ goto abort_unlock;
+ err = md_put_user (4, (char *) &loc->sectors);
+ if (err)
+ goto abort_unlock;
+ err = md_put_user (md_hd_struct[mdidx(mddev)].nr_sects/8,
+ (short *) &loc->cylinders);
+ if (err)
+ goto abort_unlock;
+ err = md_put_user (md_hd_struct[minor].start_sect,
+ (long *) &loc->start);
+ goto done_unlock;
}
/*
- * Careful. We cannot increase nb_dev for a running array.
+ * The remaining ioctls are changing the state of the
+ * superblock, so we do not allow read-only arrays
+ * here:
*/
- i=md_dev[minor].nb_dev;
- realdev = &md_dev[minor].devices[i];
- realdev->dev=dev;
-
- /* Lock the device by inserting a dummy inode. This doesn't
- smell very good, but I need to be consistent with the
- mount stuff, specially with fs_may_mount. If someone have
- a better idea, please help ! */
-
- realdev->inode=get_empty_inode ();
- if (!realdev->inode)
- return -ENOMEM;
- realdev->inode->i_dev=dev; /* don't care about other fields */
- insert_inode_hash (realdev->inode);
-
- /* Sizes are now rounded at run time */
-
-/* md_dev[minor].devices[i].size=gen_real->sizes[MINOR(dev)]; HACKHACK*/
+ if (mddev->ro) {
+ err = -EROFS;
+ goto abort_unlock;
+ }
+
+ switch (cmd)
+ {
+ case CLEAR_ARRAY:
+ err = clear_array(mddev);
+ goto done_unlock;
+
+ case ADD_NEW_DISK:
+ err = add_new_disk(mddev, (void *)arg);
+ goto done_unlock;
+
+ case HOT_REMOVE_DISK:
+ err = hot_remove_disk(mddev, (kdev_t)arg);
+ goto done_unlock;
+
+ case HOT_ADD_DISK:
+ err = hot_add_disk(mddev, (kdev_t)arg);
+ goto done_unlock;
+
+ case SET_DISK_INFO:
+ err = set_disk_info(mddev, (void *)arg);
+ goto done_unlock;
+
+ case WRITE_RAID_INFO:
+ err = write_raid_info(mddev);
+ goto done_unlock;
+
+ case UNPROTECT_ARRAY:
+ err = unprotect_array(mddev);
+ goto done_unlock;
+
+ case PROTECT_ARRAY:
+ err = protect_array(mddev);
+ goto done_unlock;
+
+ case SET_DISK_FAULTY:
+ err = set_disk_faulty(mddev, (kdev_t)arg);
+ goto done_unlock;
- realdev->size=blk_size[MAJOR(dev)][MINOR(dev)];
+ case RUN_ARRAY:
+ {
+ mdu_param_t param;
- if (hot_add) {
- /*
- * Check the superblock for consistency.
- * The personality itself has to check whether it's getting
- * added with the proper flags. The personality has to be
- * checked too. ;)
- */
- if (analyze_one_sb (realdev))
- return -EINVAL;
- /*
- * hot_add has to bump up nb_dev itself
- */
- if (md_dev[minor].pers->hot_add_disk (&md_dev[minor], dev)) {
+ err = md_copy_from_user(¶m, (mdu_param_t *)arg,
+ sizeof(param));
+ if (err)
+ goto abort_unlock;
+
+ err = do_md_run (mddev);
/*
- * FIXME: here we should free up the inode and stuff
+ * we have to clean up the mess if
+ * the array cannot be run for some
+ * reason ...
*/
- printk ("FIXME\n");
- return -EINVAL;
+ if (err) {
+ mddev->sb_dirty = 0;
+ do_md_stop (mddev, 0);
+ }
+ goto done_unlock;
}
- } else
- md_dev[minor].nb_dev++;
-
- printk ("REGISTER_DEV %s to md%x done\n", partition_name(dev), minor);
- return (0);
-}
-
-static int md_ioctl (struct inode *inode, struct file *file,
- unsigned int cmd, unsigned long arg)
-{
- int minor, err;
- struct hd_geometry *loc = (struct hd_geometry *) arg;
- if (!capable(CAP_SYS_ADMIN))
- return -EACCES;
-
- if (((minor=MINOR(inode->i_rdev)) & 0x80) &&
- (minor & 0x7f) < MAX_PERSONALITY &&
- pers[minor & 0x7f] &&
- pers[minor & 0x7f]->ioctl)
- return (pers[minor & 0x7f]->ioctl (inode, file, cmd, arg));
-
- if (minor >= MAX_MD_DEV)
- return -EINVAL;
+ default:
+ printk(KERN_WARNING "%s(pid %d) used obsolete MD ioctl, upgrade your software to use new ictls.\n", current->comm, current->pid);
+ err = -EINVAL;
+ goto abort_unlock;
+ }
- switch (cmd)
- {
- case REGISTER_DEV:
- return do_md_add (minor, to_kdev_t ((dev_t) arg));
-
- case START_MD:
- return do_md_run (minor, (int) arg);
-
- case STOP_MD:
- return do_md_stop (minor, inode);
-
- case BLKGETSIZE: /* Return device size */
- if (!arg) return -EINVAL;
- err = put_user (md_hd_struct[MINOR(inode->i_rdev)].nr_sects, (long *) arg);
- if (err)
- return err;
- break;
-
-
- /* We have a problem here : there is no easy way to give a CHS
- virtual geometry. We currently pretend that we have a 2 heads
- 4 sectors (with a BIG number of cylinders...). This drives dosfs
- just mad... ;-) */
-
- case HDIO_GETGEO:
- if (!loc) return -EINVAL;
- err = put_user (2, (char *) &loc->heads);
- if (err)
- return err;
- err = put_user (4, (char *) &loc->sectors);
- if (err)
- return err;
- err = put_user (md_hd_struct[minor].nr_sects/8, (short *) &loc->cylinders);
- if (err)
- return err;
- err = put_user (md_hd_struct[MINOR(inode->i_rdev)].start_sect,
- (long *) &loc->start);
- if (err)
- return err;
- break;
-
- case BLKROSET:
- case BLKROGET:
- case BLKRAGET:
- case BLKRASET:
- case BLKFLSBUF:
- return blk_ioctl(inode->i_rdev, cmd, arg);
-
- default:
- return -EINVAL;
- }
+done_unlock:
+abort_unlock:
+ if (mddev)
+ unlock_mddev(mddev);
+ else
+ printk("huh11?\n");
- return (0);
+ return err;
+done:
+ if (err)
+ printk("huh12?\n");
+abort:
+ return err;
}
static int md_open (struct inode *inode, struct file *file)
{
- int minor=MINOR(inode->i_rdev);
-
- md_dev[minor].busy++;
- return (0); /* Always succeed */
-}
-
-
-static int md_release (struct inode *inode, struct file *file)
-{
- int minor=MINOR(inode->i_rdev);
- md_dev[minor].busy--;
- return 0;
+ /*
+ * Always succeed
+ */
+ return (0);
}
static struct block_device_operations md_fops=
{
open: md_open,
- release: md_release,
ioctl: md_ioctl,
};
+
-int md_map (int minor, kdev_t *rdev, unsigned long *rsector, unsigned long size)
+int md_thread(void * arg)
{
- if ((unsigned int) minor >= MAX_MD_DEV)
- {
- printk ("Bad md device %d\n", minor);
- return (-1);
- }
-
- if (!md_dev[minor].pers)
- {
- printk ("Oops ! md%d not running, giving up !\n", minor);
- return (-1);
- }
+ mdk_thread_t *thread = arg;
- return (md_dev[minor].pers->map(md_dev+minor, rdev, rsector, size));
-}
-
-int md_make_request (int minor, int rw, struct buffer_head * bh)
-{
- if (md_dev [minor].pers->make_request) {
- if (buffer_locked(bh))
- return 0;
- set_bit(BH_Lock, &bh->b_state);
- if (rw == WRITE) {
- if (!buffer_dirty(bh)) {
- bh->b_end_io(bh, test_bit(BH_Uptodate, &bh->b_state));
- return 0;
- }
+ md_lock_kernel();
+ exit_mm(current);
+ exit_files(current);
+ exit_fs(current);
+
+ /*
+ * Detach thread
+ */
+ sys_setsid();
+ sprintf(current->comm, thread->name);
+ md_init_signals();
+ md_flush_signals();
+ thread->tsk = current;
+
+ /*
+ * md_thread is a 'system-thread', it's priority should be very
+ * high. We avoid resource deadlocks individually in each
+ * raid personality. (RAID5 does preallocation) We also use RR and
+ * the very same RT priority as kswapd, thus we will never get
+ * into a priority inversion deadlock.
+ *
+ * we definitely have to have equal or higher priority than
+ * bdflush, otherwise bdflush will deadlock if there are too
+ * many dirty RAID5 blocks.
+ */
+ current->policy = SCHED_OTHER;
+ current->priority = 40;
+// md_unlock_kernel();
+
+ up(thread->sem);
+
+ for (;;) {
+ DECLARE_WAITQUEUE(wait, current);
+
+ add_wait_queue(&thread->wqueue, &wait);
+ if (!test_bit(THREAD_WAKEUP, &thread->flags)) {
+ set_task_state(current, TASK_INTERRUPTIBLE);
+ dprintk("thread %p went to sleep.\n", thread);
+ schedule();
+ dprintk("thread %p woke up.\n", thread);
+ current->state = TASK_RUNNING;
}
- if (rw == READ || rw == READA) {
- if (buffer_uptodate(bh)) {
- bh->b_end_io(bh, test_bit(BH_Uptodate, &bh->b_state));
- return 0;
- }
+ remove_wait_queue(&thread->wqueue, &wait);
+ clear_bit(THREAD_WAKEUP, &thread->flags);
+
+ if (thread->run) {
+ thread->run(thread->data);
+ run_task_queue(&tq_disk);
+ } else
+ break;
+ if (md_signal_pending(current)) {
+ printk("%8s(%d) flushing signals.\n", current->comm,
+ current->pid);
+ md_flush_signals();
}
- return (md_dev[minor].pers->make_request(md_dev+minor, rw, bh));
- } else {
- make_request (MAJOR(bh->b_rdev), rw, bh);
- return 0;
}
+ up(thread->sem);
+ return 0;
}
-static void do_md_request (request_queue_t * q)
-{
- printk ("Got md request, not good...");
- return;
-}
-
-void md_wakeup_thread(struct md_thread *thread)
+void md_wakeup_thread(mdk_thread_t *thread)
{
+ dprintk("waking up MD thread %p.\n", thread);
set_bit(THREAD_WAKEUP, &thread->flags);
wake_up(&thread->wqueue);
}
-struct md_thread *md_register_thread (void (*run) (void *), void *data)
+mdk_thread_t *md_register_thread (void (*run) (void *),
+ void *data, const char *name)
{
- struct md_thread *thread = (struct md_thread *)
- kmalloc(sizeof(struct md_thread), GFP_KERNEL);
+ mdk_thread_t *thread;
int ret;
DECLARE_MUTEX_LOCKED(sem);
- if (!thread) return NULL;
+ thread = (mdk_thread_t *) kmalloc
+ (sizeof(mdk_thread_t), GFP_KERNEL);
+ if (!thread)
+ return NULL;
- memset(thread, 0, sizeof(struct md_thread));
- init_waitqueue_head(&thread->wqueue);
+ memset(thread, 0, sizeof(mdk_thread_t));
+ md_init_waitqueue_head(&thread->wqueue);
thread->sem = &sem;
thread->run = run;
thread->data = data;
+ thread->name = name;
ret = kernel_thread(md_thread, thread, 0);
if (ret < 0) {
kfree(thread);
@@ -760,387 +2882,317 @@
return thread;
}
-void md_unregister_thread (struct md_thread *thread)
+void md_interrupt_thread (mdk_thread_t *thread)
+{
+ if (!thread->tsk) {
+ MD_BUG();
+ return;
+ }
+ printk("interrupting MD-thread pid %d\n", thread->tsk->pid);
+ send_sig(SIGKILL, thread->tsk, 1);
+}
+
+void md_unregister_thread (mdk_thread_t *thread)
{
DECLARE_MUTEX_LOCKED(sem);
thread->sem = &sem;
thread->run = NULL;
- if (thread->tsk)
- printk("Killing md_thread %d %p %s\n",
- thread->tsk->pid, thread->tsk, thread->tsk->comm);
- else
- printk("Aiee. md_thread has 0 tsk\n");
- send_sig(SIGKILL, thread->tsk, 1);
- printk("downing on %p\n", &sem);
+ thread->name = NULL;
+ if (!thread->tsk) {
+ MD_BUG();
+ return;
+ }
+ md_interrupt_thread(thread);
down(&sem);
}
-#define SHUTDOWN_SIGS (sigmask(SIGKILL)|sigmask(SIGINT)|sigmask(SIGTERM))
+void md_recover_arrays (void)
+{
+ if (!md_recovery_thread) {
+ MD_BUG();
+ return;
+ }
+ md_wakeup_thread(md_recovery_thread);
+}
+
-int md_thread(void * arg)
+int md_error (kdev_t dev, kdev_t rdev)
{
- struct md_thread *thread = arg;
+ mddev_t *mddev = kdev_to_mddev(dev);
+ mdk_rdev_t * rrdev;
+ int rc;
- lock_kernel();
- exit_mm(current);
- exit_files(current);
- exit_fs(current);
-
- current->session = 1;
- current->pgrp = 1;
- sprintf(current->comm, "md_thread");
- siginitsetinv(¤t->blocked, SHUTDOWN_SIGS);
- thread->tsk = current;
- up(thread->sem);
+ printk("md_error dev:(%d:%d), rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",MAJOR(dev),MINOR(dev),MAJOR(rdev),MINOR(rdev), __builtin_return_address(0),__builtin_return_address(1),__builtin_return_address(2),__builtin_return_address(3));
- for (;;) {
- cli();
- if (!test_bit(THREAD_WAKEUP, &thread->flags)) {
- do {
- spin_lock(¤t->sigmask_lock);
- flush_signals(current);
- spin_unlock(¤t->sigmask_lock);
- interruptible_sleep_on(&thread->wqueue);
- cli();
- if (test_bit(THREAD_WAKEUP, &thread->flags))
- break;
- if (!thread->run) {
- sti();
- up(thread->sem);
- return 0;
- }
- } while (signal_pending(current));
- }
- sti();
- clear_bit(THREAD_WAKEUP, &thread->flags);
- if (thread->run) {
- thread->run(thread->data);
- run_task_queue(&tq_disk);
+ if (!mddev) {
+ MD_BUG();
+ return 0;
+ }
+ rrdev = find_rdev(mddev, rdev);
+ mark_rdev_faulty(rrdev);
+ /*
+ * if recovery was running, stop it now.
+ */
+ if (mddev->pers->stop_resync)
+ mddev->pers->stop_resync(mddev);
+ if (mddev->recovery_running)
+ md_interrupt_thread(md_recovery_thread);
+ if (mddev->pers->error_handler) {
+ rc = mddev->pers->error_handler(mddev, rdev);
+ md_recover_arrays();
+ return rc;
+ }
+ return 0;
+}
+
+static int status_unused (char * page)
+{
+ int sz = 0, i = 0;
+ mdk_rdev_t *rdev;
+ struct md_list_head *tmp;
+
+ sz += sprintf(page + sz, "unused devices: ");
+
+ ITERATE_RDEV_ALL(rdev,tmp) {
+ if (!rdev->same_set.next && !rdev->same_set.prev) {
+ /*
+ * The device is not yet used by any array.
+ */
+ i++;
+ sz += sprintf(page + sz, "%s ",
+ partition_name(rdev->dev));
}
}
+ if (!i)
+ sz += sprintf(page + sz, "<none>");
+
+ sz += sprintf(page + sz, "\n");
+ return sz;
}
-EXPORT_SYMBOL(md_size);
-EXPORT_SYMBOL(md_maxreadahead);
-EXPORT_SYMBOL(register_md_personality);
-EXPORT_SYMBOL(unregister_md_personality);
-EXPORT_SYMBOL(md_dev);
-EXPORT_SYMBOL(md_error);
-EXPORT_SYMBOL(md_register_thread);
-EXPORT_SYMBOL(md_unregister_thread);
-EXPORT_SYMBOL(md_update_sb);
-EXPORT_SYMBOL(md_map);
-EXPORT_SYMBOL(md_wakeup_thread);
-EXPORT_SYMBOL(md_do_sync);
-#ifdef CONFIG_PROC_FS
-static int md_status_read_proc(char *page, char **start, off_t off,
- int count, int *eof, void *data)
+static int status_resync (char * page, mddev_t * mddev)
{
- int sz = 0, i, j, size;
- int begin = 0;
+ int sz = 0;
+ unsigned int blocksize, max_blocks, resync, res, dt, tt, et;
+
+ resync = mddev->curr_resync;
+ blocksize = blksize_size[MD_MAJOR][mdidx(mddev)];
+ max_blocks = blk_size[MD_MAJOR][mdidx(mddev)] / (blocksize >> 10);
- sz=sprintf( page, "Personalities : ");
- for (i=0; i<MAX_PERSONALITY; i++)
- if (pers[i])
- sz+=sprintf (page+sz, "[%d %s] ", i, pers[i]->name);
- page[sz-1]='\n';
-
- sz+=sprintf (page+sz, "read_ahead ");
- if (read_ahead[MD_MAJOR]==INT_MAX)
- sz+=sprintf (page+sz, "not set\n");
+ /*
+ * Should not happen.
+ */
+ if (!max_blocks) {
+ MD_BUG();
+ return 0;
+ }
+ res = (resync/1024)*1000/(max_blocks/1024 + 1);
+ {
+ int i, x = res/50, y = 20-x;
+ sz += sprintf(page + sz, "[");
+ for (i = 0; i < x; i++)
+ sz += sprintf(page + sz, "=");
+ sz += sprintf(page + sz, ">");
+ for (i = 0; i < y; i++)
+ sz += sprintf(page + sz, ".");
+ sz += sprintf(page + sz, "] ");
+ }
+ if (!mddev->recovery_running)
+ /*
+ * true resync
+ */
+ sz += sprintf(page + sz, " resync =%3u.%u%% (%u/%u)",
+ res/10, res % 10, resync, max_blocks);
else
- sz+=sprintf (page+sz, "%d sectors\n", read_ahead[MD_MAJOR]);
+ /*
+ * recovery ...
+ */
+ sz += sprintf(page + sz, " recovery =%3u.%u%% (%u/%u)",
+ res/10, res % 10, resync, max_blocks);
- for (i=0; i<MAX_MD_DEV; i++) {
- if (sz < off) {
- begin += sz;
- off -= sz;
- sz = 0;
- }
- if (sz >= off+count) {
- *eof = 1;
- break;
- }
- sz+=sprintf (page+sz, "md%d : %sactive",
- i, md_dev[i].pers ? "" : "in");
+ /*
+ * We do not want to overflow, so the order of operands and
+ * the * 100 / 100 trick are important. We do a +1 to be
+ * safe against division by zero. We only estimate anyway.
+ *
+ * dt: time until now
+ * tt: total time
+ * et: estimated finish time
+ */
+ dt = ((jiffies - mddev->resync_start) / HZ);
+ tt = (dt * (max_blocks / (resync/100+1)))/100;
+ if (tt > dt)
+ et = tt - dt;
+ else
+ /*
+ * ignore rounding effects near finish time
+ */
+ et = 0;
+
+ sz += sprintf(page + sz, " finish=%u.%umin", et / 60, (et % 60)/6);
- if (md_dev[i].pers)
- sz+=sprintf (page+sz, " %s", md_dev[i].pers->name);
+ return sz;
+}
- for (j=0, size=0; j<md_dev[i].nb_dev; j++) {
- sz+=sprintf (page+sz, " %s",
- partition_name(md_dev[i].devices[j].dev));
- size+=md_dev[i].devices[j].size;
+static int md_status_read_proc(char *page, char **start, off_t off,
+ int count, int *eof, void *data)
+{
+ int sz = 0, j, size;
+ struct md_list_head *tmp, *tmp2;
+ mdk_rdev_t *rdev;
+ mddev_t *mddev;
+
+ sz += sprintf(page + sz, "Personalities : ");
+ for (j = 0; j < MAX_PERSONALITY; j++)
+ if (pers[j])
+ sz += sprintf(page+sz, "[%s] ", pers[j]->name);
+
+ sz += sprintf(page+sz, "\n");
+
+
+ sz += sprintf(page+sz, "read_ahead ");
+ if (read_ahead[MD_MAJOR] == INT_MAX)
+ sz += sprintf(page+sz, "not set\n");
+ else
+ sz += sprintf(page+sz, "%d sectors\n", read_ahead[MD_MAJOR]);
+
+ ITERATE_MDDEV(mddev,tmp) {
+ sz += sprintf(page + sz, "md%d : %sactive", mdidx(mddev),
+ mddev->pers ? "" : "in");
+ if (mddev->pers) {
+ if (mddev->ro)
+ sz += sprintf(page + sz, " (read-only)");
+ sz += sprintf(page + sz, " %s", mddev->pers->name);
+ }
+
+ size = 0;
+ ITERATE_RDEV(mddev,rdev,tmp2) {
+ sz += sprintf(page + sz, " %s[%d]",
+ partition_name(rdev->dev), rdev->desc_nr);
+ if (rdev->faulty) {
+ sz += sprintf(page + sz, "(F)");
+ continue;
+ }
+ size += rdev->size;
}
- if (md_dev[i].nb_dev) {
- if (md_dev[i].pers)
- sz+=sprintf (page+sz, " %d blocks", md_size[i]);
+ if (mddev->nb_dev) {
+ if (mddev->pers)
+ sz += sprintf(page + sz, "\n %d blocks",
+ md_size[mdidx(mddev)]);
else
- sz+=sprintf (page+sz, " %d blocks", size);
+ sz += sprintf(page + sz, "\n %d blocks", size);
}
- if (!md_dev[i].pers) {
- sz+=sprintf (page+sz, "\n");
+ if (!mddev->pers) {
+ sz += sprintf(page+sz, "\n");
continue;
}
- if (md_dev[i].pers->max_invalid_dev)
- sz+=sprintf (page+sz, " maxfault=%ld",
- MAX_FAULT(md_dev+i));
+ sz += mddev->pers->status (page+sz, mddev);
- sz+=md_dev[i].pers->status (page+sz, i, md_dev+i);
- sz+=sprintf (page+sz, "\n");
+ sz += sprintf(page+sz, "\n ");
+ if (mddev->curr_resync) {
+ sz += status_resync (page+sz, mddev);
+ } else {
+ if (md_atomic_read(&mddev->resync_sem.count) != 1)
+ sz += sprintf(page + sz, " resync=DELAYED");
+ }
+ sz += sprintf(page + sz, "\n");
}
+ sz += status_unused (page + sz);
- sz -= off;
- *start = page + off;
- if (sz>count)
- sz = count;
- if (sz<0)
- sz = 0;
return sz;
}
-#endif
-
-static void md_geninit (void)
-{
- int i;
-
- blksize_size[MD_MAJOR] = md_blocksizes;
- max_readahead[MD_MAJOR] = md_maxreadahead;
- for(i=0;i<MAX_MD_DEV;i++)
- {
- md_blocksizes[i] = 1024;
- md_maxreadahead[i] = MD_DEFAULT_DISK_READAHEAD;
- md_dev[i].pers=NULL;
- register_disk(&md_gendisk, MKDEV(MAJOR_NR,i), 1, &md_fops, 0);
- }
-
-#ifdef CONFIG_PROC_FS
- create_proc_read_entry("mdstat", 0, NULL, md_status_read_proc, NULL);
-#endif
-}
-
-int md_error (kdev_t mddev, kdev_t rdev)
-{
- unsigned int minor = MINOR (mddev);
- int rc;
- if (MAJOR(mddev) != MD_MAJOR || minor > MAX_MD_DEV)
- panic ("md_error gets unknown device\n");
- if (!md_dev [minor].pers)
- panic ("md_error gets an error for an unknown device\n");
- if (md_dev [minor].pers->error_handler) {
- rc = md_dev [minor].pers->error_handler (md_dev+minor, rdev);
-#if SUPPORT_RECONSTRUCTION
- md_wakeup_thread(md_sync_thread);
-#endif /* SUPPORT_RECONSTRUCTION */
- return rc;
- }
- return 0;
-}
-
-int register_md_personality (int p_num, struct md_personality *p)
+int register_md_personality (int pnum, mdk_personality_t *p)
{
- int i=(p_num >> PERSONALITY_SHIFT);
-
- if (i >= MAX_PERSONALITY)
- return -EINVAL;
+ if (pnum >= MAX_PERSONALITY)
+ return -EINVAL;
- if (pers[i])
- return -EBUSY;
+ if (pers[pnum])
+ return -EBUSY;
- pers[i]=p;
- printk ("%s personality registered\n", p->name);
- return 0;
+ pers[pnum] = p;
+ printk(KERN_INFO "%s personality registered\n", p->name);
+ return 0;
}
-int unregister_md_personality (int p_num)
+int unregister_md_personality (int pnum)
{
- int i=(p_num >> PERSONALITY_SHIFT);
-
- if (i >= MAX_PERSONALITY)
- return -EINVAL;
+ if (pnum >= MAX_PERSONALITY)
+ return -EINVAL;
- printk ("%s personality unregistered\n", pers[i]->name);
- pers[i]=NULL;
- return 0;
+ printk(KERN_INFO "%s personality unregistered\n", pers[pnum]->name);
+ pers[pnum] = NULL;
+ return 0;
}
-static md_descriptor_t *get_spare(struct md_dev *mddev)
-{
- int i;
- md_superblock_t *sb = mddev->sb;
- md_descriptor_t *descriptor;
- struct real_dev *realdev;
-
- for (i = 0; i < mddev->nb_dev; i++) {
- realdev = &mddev->devices[i];
- if (!realdev->sb)
- continue;
- descriptor = &sb->disks[realdev->sb->descriptor.number];
- if (descriptor->state & (1 << MD_FAULTY_DEVICE))
- continue;
- if (descriptor->state & (1 << MD_ACTIVE_DEVICE))
- continue;
- return descriptor;
- }
- return NULL;
-}
-
-/*
- * parallel resyncing thread.
- *
- * FIXME: - make it abort with a dirty array on mdstop, now it just blocks
- * - fix read error handing
- */
-
-int md_do_sync(struct md_dev *mddev)
+int md_notify_reboot(struct notifier_block *this,
+ unsigned long code, void *x)
{
- struct buffer_head *bh;
- int max_blocks, blocksize, curr_bsize, percent=1, j;
- kdev_t read_disk = MKDEV(MD_MAJOR, mddev - md_dev);
- int major = MAJOR(read_disk), minor = MINOR(read_disk);
- unsigned long starttime;
-
- blocksize = blksize_size[major][minor];
- max_blocks = blk_size[major][minor] / (blocksize >> 10);
-
- printk("... resync log\n");
- printk(" .... mddev->nb_dev: %d\n", mddev->nb_dev);
- printk(" .... raid array: %s\n", kdevname(read_disk));
- printk(" .... max_blocks: %d blocksize: %d\n", max_blocks, blocksize);
- printk("md: syncing RAID array %s\n", kdevname(read_disk));
-
- mddev->busy++;
-
- starttime=jiffies;
- for (j = 0; j < max_blocks; j++) {
-
- /*
- * B careful. When some1 mounts a non-'blocksize' filesystem
- * then we get the blocksize changed right under us. Go deal
- * with it transparently, recalculate 'blocksize', 'j' and
- * 'max_blocks':
- */
- curr_bsize = blksize_size[major][minor];
- if (curr_bsize != blocksize) {
- diff_blocksize:
- if (curr_bsize > blocksize)
- /*
- * this is safe, rounds downwards.
- */
- j /= curr_bsize/blocksize;
- else
- j *= blocksize/curr_bsize;
-
- blocksize = curr_bsize;
- max_blocks = blk_size[major][minor] / (blocksize >> 10);
- }
- if ((bh = breada (read_disk, j, blocksize, j * blocksize,
- max_blocks * blocksize)) != NULL) {
- mark_buffer_dirty(bh, 1);
- brelse(bh);
- } else {
- /*
- * FIXME: Ugly, but set_blocksize() isnt safe ...
- */
- curr_bsize = blksize_size[major][minor];
- if (curr_bsize != blocksize)
- goto diff_blocksize;
+ struct md_list_head *tmp;
+ mddev_t *mddev;
- /*
- * It's a real read problem. FIXME, handle this
- * a better way.
- */
- printk ( KERN_ALERT
- "read error, stopping reconstruction.\n");
- mddev->busy--;
- return 1;
- }
+ if ((code == MD_SYS_DOWN) || (code == MD_SYS_HALT)
+ || (code == MD_SYS_POWER_OFF)) {
- /*
- * Let's sleep some if we are faster than our speed limit:
- */
- while (blocksize*j/(jiffies-starttime+1)*HZ/1024 > SPEED_LIMIT)
- {
- current->state = TASK_INTERRUPTIBLE;
- schedule_timeout(1);
- }
+ printk(KERN_INFO "stopping all md devices.\n");
+ ITERATE_MDDEV(mddev,tmp)
+ do_md_stop (mddev, 1);
/*
- * FIXME: put this status bar thing into /proc
+ * certain more exotic SCSI devices are known to be
+ * volatile wrt too early system reboots. While the
+ * right place to handle this issue is the given
+ * driver, we do want to have a safe RAID driver ...
*/
- if (!(j%(max_blocks/100))) {
- if (!(percent%10))
- printk (" %03d%% done.\n",percent);
- else
- printk (".");
- percent++;
- }
+ md_mdelay(1000*1);
}
- fsync_dev(read_disk);
- printk("md: %s: sync done.\n", kdevname(read_disk));
- mddev->busy--;
- return 0;
+ return NOTIFY_DONE;
}
-/*
- * This is a kernel thread which: syncs a spare disk with the active array
- *
- * the amount of foolproofing might seem to be a tad excessive, but an
- * early (not so error-safe) version of raid1syncd synced the first 0.5 gigs
- * of my root partition with the first 0.5 gigs of my /home partition ... so
- * i'm a bit nervous ;)
- */
-void mdsyncd (void *data)
+struct notifier_block md_notifier = {
+ md_notify_reboot,
+ NULL,
+ 0
+};
+
+void md__init raid_setup(char *str, int *ints)
{
- int i;
- struct md_dev *mddev;
- md_superblock_t *sb;
- md_descriptor_t *spare;
- unsigned long flags;
+ char tmpline[100];
+ int len, pos, nr, i;
- for (i = 0, mddev = md_dev; i < MAX_MD_DEV; i++, mddev++) {
- if ((sb = mddev->sb) == NULL)
- continue;
- if (sb->active_disks == sb->raid_disks)
- continue;
- if (!sb->spare_disks)
- continue;
- if ((spare = get_spare(mddev)) == NULL)
- continue;
- if (!mddev->pers->mark_spare)
- continue;
- if (mddev->pers->mark_spare(mddev, spare, SPARE_WRITE))
- continue;
- if (md_do_sync(mddev) || (spare->state & (1 << MD_FAULTY_DEVICE))) {
- mddev->pers->mark_spare(mddev, spare, SPARE_INACTIVE);
+ len = strlen(str) + 1;
+ nr = 0;
+ pos = 0;
+
+ for (i = 0; i < len; i++) {
+ char c = str[i];
+
+ if (c == ',' || !c) {
+ tmpline[pos] = 0;
+ if (!strcmp(tmpline,"noautodetect"))
+ raid_setup_args.noautodetect = 1;
+ nr++;
+ pos = 0;
continue;
}
- save_flags(flags);
- cli();
- mddev->pers->mark_spare(mddev, spare, SPARE_ACTIVE);
- spare->state |= (1 << MD_SYNC_DEVICE);
- spare->state |= (1 << MD_ACTIVE_DEVICE);
- sb->spare_disks--;
- sb->active_disks++;
- mddev->sb_dirty = 1;
- md_update_sb(mddev - md_dev);
- restore_flags(flags);
+ tmpline[pos] = c;
+ pos++;
}
-
+ raid_setup_args.set = 1;
+ return;
}
#ifdef CONFIG_MD_BOOT
struct {
unsigned long set;
- int pers[MAX_MD_DEV];
- kdev_t devices[MAX_MD_DEV][MAX_REAL];
-} md_setup_args __initdata = {
+ int pers[MAX_MD_DEVS];
+ kdev_t devices[MAX_MD_DEVS][MAX_REAL];
+} md_setup_args md__initdata = {
0,{0},{{0}}
};
@@ -1155,7 +3207,7 @@
* the MD devices (by specifying multiple "md=" lines)
* instead of just one. -- KTK
*/
-int __init md_setup(char *str)
+static int __init md_setup(char *str)
{
int minor, level, factor, fault, i;
kdev_t device;
@@ -1167,31 +3219,31 @@
get_option(&str, &fault) != 2) {
printk("md: Too few arguments supplied to md=.\n");
return 0;
- } else if (minor >= MAX_MD_DEV) {
- printk ("md: Minor device number too high.\n");
+ } else if (minor >= MAX_MD_DEVS) {
+ printk ("md: Minor device number too high.\n");
return 0;
} else if (md_setup_args.set & (1 << minor)) {
printk ("md: Warning - md=%d,... has been specified twice;\n"
" will discard the first definition.\n", minor);
- }
+ }
switch(level) {
#ifdef CONFIG_MD_LINEAR
case -1:
level = LINEAR;
pername = "linear";
- break;
+ break;
#endif
#ifdef CONFIG_MD_STRIPED
case 0:
level = STRIPED;
pername = "striped";
- break;
+ break;
#endif
default:
printk ("md: The kernel has not been configured for raid%d"
" support!\n", level);
return 0;
- }
+ }
devnames = str;
for (i = 0; str; i++) {
if ((device = name_to_kdev_t(str))) {
@@ -1215,61 +3267,87 @@
md_setup_args.set |= (1 << minor);
return 0;
}
-
#endif
+static void md_geninit (void)
+{
+ int i;
+
+ blksize_size[MD_MAJOR] = md_blocksizes;
+ max_readahead[MD_MAJOR] = md_maxreadahead;
+
+ for(i = 0; i < MAX_MD_DEVS; i++) {
+ md_blocksizes[i] = 1024;
+ md_maxreadahead[i] = MD_READAHEAD;
+ register_disk(&md_gendisk, MKDEV(MAJOR_NR,i), 1, &md_fops, 0);
+
+ }
+
+ printk("md.c: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
+
+#ifdef CONFIG_PROC_FS
+ create_proc_read_entry("mdstat", 0, NULL, md_status_read_proc, NULL);
+#endif
+}
+void hsm_init (void);
+void translucent_init (void);
void linear_init (void);
void raid0_init (void);
void raid1_init (void);
void raid5_init (void);
-int __init md_init (void)
+int md__init md_init (void)
{
- printk ("md driver %d.%d.%d MAX_MD_DEV=%d, MAX_REAL=%d\n",
- MD_MAJOR_VERSION, MD_MINOR_VERSION, MD_PATCHLEVEL_VERSION,
- MAX_MD_DEV, MAX_REAL);
-
- if (register_blkdev (MD_MAJOR, "md", &md_fops))
- {
- printk ("Unable to get major %d for md\n", MD_MAJOR);
- return (-1);
- }
-
- blk_init_queue(BLK_DEFAULT_QUEUE(MAJOR_NR), DEVICE_REQUEST);
- read_ahead[MD_MAJOR]=INT_MAX;
- memset(md_dev, 0, MAX_MD_DEV * sizeof (struct md_dev));
- md_gendisk.next=gendisk_head;
-
- gendisk_head=&md_gendisk;
-
-#if SUPPORT_RECONSTRUCTION
- if ((md_sync_thread = md_register_thread(mdsyncd, NULL)) == NULL)
- printk("md: bug: md_sync_thread == NULL\n");
-#endif /* SUPPORT_RECONSTRUCTION */
+ printk (KERN_INFO "md driver %d.%d.%d MAX_MD_DEVS=%d, MAX_REAL=%d\n",
+ MD_MAJOR_VERSION, MD_MINOR_VERSION,
+ MD_PATCHLEVEL_VERSION, MAX_MD_DEVS, MAX_REAL);
+
+ if (register_blkdev (MD_MAJOR, "md", &md_fops))
+ {
+ printk (KERN_ALERT "Unable to get major %d for md\n", MD_MAJOR);
+ return (-1);
+ }
+
+ blk_dev[MD_MAJOR].queue = md_get_queue;
+
+ read_ahead[MD_MAJOR] = INT_MAX;
+ md_gendisk.next = gendisk_head;
+
+ gendisk_head = &md_gendisk;
+
+ md_register_reboot_notifier(&md_notifier);
#ifdef CONFIG_MD_LINEAR
- linear_init ();
+ linear_init ();
#endif
#ifdef CONFIG_MD_STRIPED
- raid0_init ();
+ raid0_init ();
#endif
#ifdef CONFIG_MD_MIRRORING
- raid1_init ();
+ raid1_init ();
#endif
#ifdef CONFIG_MD_RAID5
- raid5_init ();
+ raid5_init ();
#endif
- md_geninit();
- return (0);
+#if defined(CONFIG_MD_RAID5) || defined(CONFIG_MD_RAID5_MODULE)
+ /*
+ * pick a XOR routine, runtime.
+ */
+ calibrate_xor_block();
+#endif
+ md_geninit();
+ return (0);
}
#ifdef CONFIG_MD_BOOT
-void __init md_setup_drive(void)
+static void __init md_setup_drive(void)
{
+ if(md_setup_args.set)
+ do_md_setup(md_setup_args.str, md_setup_args.ints);
int minor, i;
kdev_t dev;
- for (minor = 0; minor < MAX_MD_DEV; minor++) {
+ for (minor = 0; minor < MAX_MD_DEVS; minor++) {
if ((md_setup_args.set & (1 << minor)) == 0)
continue;
printk("md: Loading md%d.\n", minor);
@@ -1281,3 +3359,20 @@
__setup("md=", md_setup);
#endif
+
+MD_EXPORT_SYMBOL(md_size);
+MD_EXPORT_SYMBOL(register_md_personality);
+MD_EXPORT_SYMBOL(unregister_md_personality);
+MD_EXPORT_SYMBOL(partition_name);
+MD_EXPORT_SYMBOL(md_error);
+MD_EXPORT_SYMBOL(md_recover_arrays);
+MD_EXPORT_SYMBOL(md_register_thread);
+MD_EXPORT_SYMBOL(md_unregister_thread);
+MD_EXPORT_SYMBOL(md_update_sb);
+MD_EXPORT_SYMBOL(md_wakeup_thread);
+MD_EXPORT_SYMBOL(md_print_devices);
+MD_EXPORT_SYMBOL(find_rdev_nr);
+MD_EXPORT_SYMBOL(md_interrupt_thread);
+MD_EXPORT_SYMBOL(mddev_map);
+MD_EXPORT_SYMBOL(md_check_ordering);
+
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)