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-rw-r--r--drivers/md/md.c172
1 files changed, 158 insertions, 14 deletions
diff --git a/drivers/md/md.c b/drivers/md/md.c
index fa608a1a5c20..c402f6cc7047 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -19,6 +19,9 @@
Neil Brown <neilb@cse.unsw.edu.au>.
+ - persistent bitmap code
+ Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.
+
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)
@@ -33,6 +36,7 @@
#include <linux/config.h>
#include <linux/linkage.h>
#include <linux/raid/md.h>
+#include <linux/raid/bitmap.h>
#include <linux/sysctl.h>
#include <linux/devfs_fs_kernel.h>
#include <linux/buffer_head.h> /* for invalidate_bdev */
@@ -40,6 +44,8 @@
#include <linux/init.h>
+#include <linux/file.h>
+
#ifdef CONFIG_KMOD
#include <linux/kmod.h>
#endif
@@ -1198,8 +1204,11 @@ void md_print_devices(void)
printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
printk("md: **********************************\n");
ITERATE_MDDEV(mddev,tmp) {
- printk("%s: ", mdname(mddev));
+ if (mddev->bitmap)
+ bitmap_print_sb(mddev->bitmap);
+ else
+ printk("%s: ", mdname(mddev));
ITERATE_RDEV(mddev,rdev,tmp2)
printk("<%s>", bdevname(rdev->bdev,b));
printk("\n");
@@ -1287,7 +1296,7 @@ repeat:
"md: updating %s RAID superblock on device (in sync %d)\n",
mdname(mddev),mddev->in_sync);
- err = 0;
+ err = bitmap_update_sb(mddev->bitmap);
ITERATE_RDEV(mddev,rdev,tmp) {
char b[BDEVNAME_SIZE];
dprintk(KERN_INFO "md: ");
@@ -1624,12 +1633,19 @@ static int do_md_run(mddev_t * mddev)
mddev->resync_max_sectors = mddev->size << 1; /* may be over-ridden by personality */
- err = mddev->pers->run(mddev);
+ /* before we start the array running, initialise the bitmap */
+ err = bitmap_create(mddev);
+ if (err)
+ printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
+ mdname(mddev), err);
+ else
+ err = mddev->pers->run(mddev);
if (err) {
printk(KERN_ERR "md: pers->run() failed ...\n");
module_put(mddev->pers->owner);
mddev->pers = NULL;
- return -EINVAL;
+ bitmap_destroy(mddev);
+ return err;
}
atomic_set(&mddev->writes_pending,0);
mddev->safemode = 0;
@@ -1742,6 +1758,14 @@ static int do_md_stop(mddev_t * mddev, int ro)
if (ro)
set_disk_ro(disk, 1);
}
+
+ bitmap_destroy(mddev);
+ if (mddev->bitmap_file) {
+ atomic_set(&mddev->bitmap_file->f_dentry->d_inode->i_writecount, 1);
+ fput(mddev->bitmap_file);
+ mddev->bitmap_file = NULL;
+ }
+
/*
* Free resources if final stop
*/
@@ -2000,6 +2024,42 @@ static int get_array_info(mddev_t * mddev, void __user * arg)
return 0;
}
+static int get_bitmap_file(mddev_t * mddev, void * arg)
+{
+ mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
+ char *ptr, *buf = NULL;
+ int err = -ENOMEM;
+
+ file = kmalloc(sizeof(*file), GFP_KERNEL);
+ if (!file)
+ goto out;
+
+ /* bitmap disabled, zero the first byte and copy out */
+ if (!mddev->bitmap || !mddev->bitmap->file) {
+ file->pathname[0] = '\0';
+ goto copy_out;
+ }
+
+ buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
+ if (!buf)
+ goto out;
+
+ ptr = file_path(mddev->bitmap->file, buf, sizeof(file->pathname));
+ if (!ptr)
+ goto out;
+
+ strcpy(file->pathname, ptr);
+
+copy_out:
+ err = 0;
+ if (copy_to_user(arg, file, sizeof(*file)))
+ err = -EFAULT;
+out:
+ kfree(buf);
+ kfree(file);
+ return err;
+}
+
static int get_disk_info(mddev_t * mddev, void __user * arg)
{
mdu_disk_info_t info;
@@ -2275,6 +2335,48 @@ abort_export:
return err;
}
+/* similar to deny_write_access, but accounts for our holding a reference
+ * to the file ourselves */
+static int deny_bitmap_write_access(struct file * file)
+{
+ struct inode *inode = file->f_mapping->host;
+
+ spin_lock(&inode->i_lock);
+ if (atomic_read(&inode->i_writecount) > 1) {
+ spin_unlock(&inode->i_lock);
+ return -ETXTBSY;
+ }
+ atomic_set(&inode->i_writecount, -1);
+ spin_unlock(&inode->i_lock);
+
+ return 0;
+}
+
+static int set_bitmap_file(mddev_t *mddev, int fd)
+{
+ int err;
+
+ if (mddev->pers)
+ return -EBUSY;
+
+ mddev->bitmap_file = fget(fd);
+
+ if (mddev->bitmap_file == NULL) {
+ printk(KERN_ERR "%s: error: failed to get bitmap file\n",
+ mdname(mddev));
+ return -EBADF;
+ }
+
+ err = deny_bitmap_write_access(mddev->bitmap_file);
+ if (err) {
+ printk(KERN_ERR "%s: error: bitmap file is already in use\n",
+ mdname(mddev));
+ fput(mddev->bitmap_file);
+ mddev->bitmap_file = NULL;
+ }
+ return err;
+}
+
/*
* set_array_info is used two different ways
* The original usage is when creating a new array.
@@ -2586,8 +2688,10 @@ static int md_ioctl(struct inode *inode, struct file *file,
/*
* Commands querying/configuring an existing array:
*/
- /* if we are initialised yet, only ADD_NEW_DISK or STOP_ARRAY is allowed */
- if (!mddev->raid_disks && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY && cmd != RUN_ARRAY) {
+ /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
+ * RUN_ARRAY, and SET_BITMAP_FILE are allowed */
+ if (!mddev->raid_disks && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
+ && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE) {
err = -ENODEV;
goto abort_unlock;
}
@@ -2601,6 +2705,10 @@ static int md_ioctl(struct inode *inode, struct file *file,
err = get_array_info(mddev, argp);
goto done_unlock;
+ case GET_BITMAP_FILE:
+ err = get_bitmap_file(mddev, (void *)arg);
+ goto done_unlock;
+
case GET_DISK_INFO:
err = get_disk_info(mddev, argp);
goto done_unlock;
@@ -2681,6 +2789,10 @@ static int md_ioctl(struct inode *inode, struct file *file,
err = do_md_run (mddev);
goto done_unlock;
+ case SET_BITMAP_FILE:
+ err = set_bitmap_file(mddev, (int)arg);
+ goto done_unlock;
+
default:
if (_IOC_TYPE(cmd) == MD_MAJOR)
printk(KERN_WARNING "md: %s(pid %d) used"
@@ -2792,8 +2904,9 @@ static int md_thread(void * arg)
while (thread->run) {
void (*run)(mddev_t *);
- wait_event_interruptible(thread->wqueue,
- test_bit(THREAD_WAKEUP, &thread->flags));
+ wait_event_interruptible_timeout(thread->wqueue,
+ test_bit(THREAD_WAKEUP, &thread->flags),
+ thread->timeout);
if (current->flags & PF_FREEZE)
refrigerator(PF_FREEZE);
@@ -2839,6 +2952,7 @@ mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev,
thread->run = run;
thread->mddev = mddev;
thread->name = name;
+ thread->timeout = MAX_SCHEDULE_TIMEOUT;
ret = kernel_thread(md_thread, thread, 0);
if (ret < 0) {
kfree(thread);
@@ -2877,13 +2991,13 @@ void md_error(mddev_t *mddev, mdk_rdev_t *rdev)
if (!rdev || rdev->faulty)
return;
-
+/*
dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
mdname(mddev),
MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
__builtin_return_address(0),__builtin_return_address(1),
__builtin_return_address(2),__builtin_return_address(3));
-
+*/
if (!mddev->pers->error_handler)
return;
mddev->pers->error_handler(mddev,rdev);
@@ -3037,6 +3151,7 @@ static int md_seq_show(struct seq_file *seq, void *v)
struct list_head *tmp2;
mdk_rdev_t *rdev;
int i;
+ struct bitmap *bitmap;
if (v == (void*)1) {
seq_printf(seq, "Personalities : ");
@@ -3089,10 +3204,36 @@ static int md_seq_show(struct seq_file *seq, void *v)
if (mddev->pers) {
mddev->pers->status (seq, mddev);
seq_printf(seq, "\n ");
- if (mddev->curr_resync > 2)
+ if (mddev->curr_resync > 2) {
status_resync (seq, mddev);
- else if (mddev->curr_resync == 1 || mddev->curr_resync == 2)
- seq_printf(seq, " resync=DELAYED");
+ seq_printf(seq, "\n ");
+ } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2)
+ seq_printf(seq, " resync=DELAYED\n ");
+ } else
+ seq_printf(seq, "\n ");
+
+ if ((bitmap = mddev->bitmap)) {
+ char *buf, *path;
+ unsigned long chunk_kb;
+ unsigned long flags;
+ buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
+ spin_lock_irqsave(&bitmap->lock, flags);
+ chunk_kb = bitmap->chunksize >> 10;
+ seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], "
+ "%lu%s chunk",
+ bitmap->pages - bitmap->missing_pages,
+ bitmap->pages,
+ (bitmap->pages - bitmap->missing_pages)
+ << (PAGE_SHIFT - 10),
+ chunk_kb ? chunk_kb : bitmap->chunksize,
+ chunk_kb ? "KB" : "B");
+ if (bitmap->file && buf) {
+ path = file_path(bitmap->file, buf, PAGE_SIZE);
+ seq_printf(seq, ", file: %s", path ? path : "");
+ }
+ seq_printf(seq, "\n");
+ spin_unlock_irqrestore(&bitmap->lock, flags);
+ kfree(buf);
}
seq_printf(seq, "\n");
@@ -3328,7 +3469,8 @@ static void md_do_sync(mddev_t *mddev)
sysctl_speed_limit_max);
is_mddev_idle(mddev); /* this also initializes IO event counters */
- if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
+ /* we don't use the checkpoint if there's a bitmap */
+ if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && !mddev->bitmap)
j = mddev->recovery_cp;
else
j = 0;
@@ -3673,6 +3815,8 @@ static int __init md_init(void)
" MD_SB_DISKS=%d\n",
MD_MAJOR_VERSION, MD_MINOR_VERSION,
MD_PATCHLEVEL_VERSION, MAX_MD_DEVS, MD_SB_DISKS);
+ printk(KERN_INFO "md: bitmap version %d.%d\n", BITMAP_MAJOR,
+ BITMAP_MINOR);
if (register_blkdev(MAJOR_NR, "md"))
return -1;
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-21 16:16:47 +0000