From 36fa30636fb84b209210299684e1be66d9e58217 Mon Sep 17 00:00:00 2001 From: NeilBrown Date: Fri, 9 Sep 2005 16:23:45 -0700 Subject: [PATCH] md: all hot-add and hot-remove of md intent logging bitmaps Both file-bitmaps and superblock bitmaps are supported. If you add a bitmap file on the array device, you lose. This introduces a 'default_bitmap_offset' field in mddev, as the ioctl used for adding a superblock bitmap doesn't have room for giving an offset. Later, this value will be setable via sysfs. Signed-off-by: Neil Brown Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/md/md.c | 104 +++++++++++++++++++++++++++++++++++++++++++++++--------- 1 file changed, 87 insertions(+), 17 deletions(-) (limited to 'drivers/md/md.c') diff --git a/drivers/md/md.c b/drivers/md/md.c index 63c566165189..ae654466dc23 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -623,6 +623,7 @@ static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev) mddev->size = sb->size; mddev->events = md_event(sb); mddev->bitmap_offset = 0; + mddev->default_bitmap_offset = MD_SB_BYTES >> 9; if (sb->state & (1<recovery_cp = MaxSector; @@ -648,7 +649,7 @@ static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev) printk(KERN_WARNING "md: bitmaps only support for raid1\n"); return -EINVAL; } - mddev->bitmap_offset = (MD_SB_BYTES >> 9); + mddev->bitmap_offset = mddev->default_bitmap_offset; } } else if (mddev->pers == NULL) { @@ -939,6 +940,9 @@ static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev) mddev->size = le64_to_cpu(sb->size)/2; mddev->events = le64_to_cpu(sb->events); mddev->bitmap_offset = 0; + mddev->default_bitmap_offset = 0; + if (mddev->minor_version == 0) + mddev->default_bitmap_offset = -(64*1024)/512; mddev->recovery_cp = le64_to_cpu(sb->resync_offset); memcpy(mddev->uuid, sb->set_uuid, 16); @@ -2073,6 +2077,8 @@ static int get_array_info(mddev_t * mddev, void __user * arg) info.state = 0; if (mddev->in_sync) info.state = (1<bitmap && mddev->bitmap_offset) + info.state = (1<pers || mddev->bitmap_file) - return -EBUSY; + if (mddev->pers) { + if (!mddev->pers->quiesce) + return -EBUSY; + if (mddev->recovery || mddev->sync_thread) + return -EBUSY; + /* we should be able to change the bitmap.. */ + } - mddev->bitmap_file = fget(fd); - if (mddev->bitmap_file == NULL) { - printk(KERN_ERR "%s: error: failed to get bitmap file\n", - mdname(mddev)); - return -EBADF; - } + if (fd >= 0) { + if (mddev->bitmap) + return -EEXIST; /* cannot add when bitmap is present */ + mddev->bitmap_file = fget(fd); - err = deny_bitmap_write_access(mddev->bitmap_file); - if (err) { - printk(KERN_ERR "%s: error: bitmap file is already in use\n", - mdname(mddev)); - fput(mddev->bitmap_file); - mddev->bitmap_file = NULL; - } else + if (mddev->bitmap_file == NULL) { + printk(KERN_ERR "%s: error: failed to get bitmap file\n", + mdname(mddev)); + return -EBADF; + } + + err = deny_bitmap_write_access(mddev->bitmap_file); + if (err) { + printk(KERN_ERR "%s: error: bitmap file is already in use\n", + mdname(mddev)); + fput(mddev->bitmap_file); + mddev->bitmap_file = NULL; + return err; + } mddev->bitmap_offset = 0; /* file overrides offset */ + } else if (mddev->bitmap == NULL) + return -ENOENT; /* cannot remove what isn't there */ + err = 0; + if (mddev->pers) { + mddev->pers->quiesce(mddev, 1); + if (fd >= 0) + err = bitmap_create(mddev); + if (fd < 0 || err) + bitmap_destroy(mddev); + mddev->pers->quiesce(mddev, 0); + } else if (fd < 0) { + if (mddev->bitmap_file) + fput(mddev->bitmap_file); + mddev->bitmap_file = NULL; + } + return err; } @@ -2528,6 +2560,11 @@ static int update_array_info(mddev_t *mddev, mdu_array_info_t *info) { int rv = 0; int cnt = 0; + int state = 0; + + /* calculate expected state,ignoring low bits */ + if (mddev->bitmap && mddev->bitmap_offset) + state |= (1 << MD_SB_BITMAP_PRESENT); if (mddev->major_version != info->major_version || mddev->minor_version != info->minor_version || @@ -2536,12 +2573,16 @@ static int update_array_info(mddev_t *mddev, mdu_array_info_t *info) mddev->level != info->level || /* mddev->layout != info->layout || */ !mddev->persistent != info->not_persistent|| - mddev->chunk_size != info->chunk_size ) + mddev->chunk_size != info->chunk_size || + /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */ + ((state^info->state) & 0xfffffe00) + ) return -EINVAL; /* Check there is only one change */ if (mddev->size != info->size) cnt++; if (mddev->raid_disks != info->raid_disks) cnt++; if (mddev->layout != info->layout) cnt++; + if ((state ^ info->state) & (1< 1) return -EINVAL; @@ -2620,6 +2661,35 @@ static int update_array_info(mddev_t *mddev, mdu_array_info_t *info) } } } + if ((state ^ info->state) & (1<pers->quiesce == NULL) + return -EINVAL; + if (mddev->recovery || mddev->sync_thread) + return -EBUSY; + if (info->state & (1<bitmap) + return -EEXIST; + if (mddev->default_bitmap_offset == 0) + return -EINVAL; + mddev->bitmap_offset = mddev->default_bitmap_offset; + mddev->pers->quiesce(mddev, 1); + rv = bitmap_create(mddev); + if (rv) + bitmap_destroy(mddev); + mddev->pers->quiesce(mddev, 0); + } else { + /* remove the bitmap */ + if (!mddev->bitmap) + return -ENOENT; + if (mddev->bitmap->file) + return -EINVAL; + mddev->pers->quiesce(mddev, 1); + bitmap_destroy(mddev); + mddev->pers->quiesce(mddev, 0); + mddev->bitmap_offset = 0; + } + } md_update_sb(mddev); return rv; } -- cgit v1.2.3