Btrfs: Add mount -o degraded to allow mounts to continue with missing devices
Signed-off-by: Chris Mason <chris.mason@oracle.com>
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 6c2c2c4..a9377fb 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -657,6 +657,7 @@
#define BTRFS_MOUNT_NODATACOW (1 << 1)
#define BTRFS_MOUNT_NOBARRIER (1 << 2)
#define BTRFS_MOUNT_SSD (1 << 3)
+#define BTRFS_MOUNT_DEGRADED (1 << 4)
#define btrfs_clear_opt(o, opt) ((o) &= ~BTRFS_MOUNT_##opt)
#define btrfs_set_opt(o, opt) ((o) |= BTRFS_MOUNT_##opt)
@@ -1606,4 +1607,6 @@
struct btrfs_root *root, struct inode *inode);
/* super.c */
u64 btrfs_parse_size(char *str);
+int btrfs_parse_options(char *options, struct btrfs_root *root,
+ char **subvol_name);
#endif
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 574b124..38b0d9e 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -614,21 +614,6 @@
return ret;
}
-static int close_all_devices(struct btrfs_fs_info *fs_info)
-{
- struct list_head *list;
- struct list_head *next;
- struct btrfs_device *device;
-
- list = &fs_info->fs_devices->devices;
- list_for_each(next, list) {
- device = list_entry(next, struct btrfs_device, dev_list);
- close_bdev_excl(device->bdev);
- device->bdev = NULL;
- }
- return 0;
-}
-
struct extent_buffer *btrfs_find_tree_block(struct btrfs_root *root,
u64 bytenr, u32 blocksize)
{
@@ -927,6 +912,8 @@
list_for_each(cur, &info->fs_devices->devices) {
device = list_entry(cur, struct btrfs_device, dev_list);
+ if (!device->bdev)
+ continue;
bdi = blk_get_backing_dev_info(device->bdev);
if (bdi && bdi_congested(bdi, bdi_bits)) {
ret = 1;
@@ -1140,7 +1127,8 @@
}
struct btrfs_root *open_ctree(struct super_block *sb,
- struct btrfs_fs_devices *fs_devices)
+ struct btrfs_fs_devices *fs_devices,
+ char *options)
{
u32 sectorsize;
u32 nodesize;
@@ -1276,12 +1264,19 @@
if (!btrfs_super_root(disk_super))
goto fail_sb_buffer;
- if (btrfs_super_num_devices(disk_super) != fs_devices->num_devices) {
+ btrfs_parse_options(options, tree_root, NULL);
+
+ if (btrfs_super_num_devices(disk_super) > fs_devices->num_devices) {
printk("Btrfs: wanted %llu devices, but found %llu\n",
(unsigned long long)btrfs_super_num_devices(disk_super),
(unsigned long long)fs_devices->num_devices);
- goto fail_sb_buffer;
+ if (btrfs_test_opt(tree_root, DEGRADED))
+ printk("continuing in degraded mode\n");
+ else {
+ goto fail_sb_buffer;
+ }
}
+
fs_info->bdi.ra_pages *= btrfs_super_num_devices(disk_super);
nodesize = btrfs_super_nodesize(disk_super);
@@ -1329,6 +1324,8 @@
ret = btrfs_read_chunk_tree(chunk_root);
BUG_ON(ret);
+ btrfs_close_extra_devices(fs_devices);
+
blocksize = btrfs_level_size(tree_root,
btrfs_super_root_level(disk_super));
@@ -1374,7 +1371,7 @@
fail_iput:
iput(fs_info->btree_inode);
fail:
- close_all_devices(fs_info);
+ btrfs_close_devices(fs_info->fs_devices);
btrfs_mapping_tree_free(&fs_info->mapping_tree);
kfree(extent_root);
@@ -1429,6 +1426,13 @@
dev_item = &sb->dev_item;
list_for_each(cur, head) {
dev = list_entry(cur, struct btrfs_device, dev_list);
+ if (!dev->bdev) {
+ total_errors++;
+ continue;
+ }
+ if (!dev->in_fs_metadata)
+ continue;
+
btrfs_set_stack_device_type(dev_item, dev->type);
btrfs_set_stack_device_id(dev_item, dev->devid);
btrfs_set_stack_device_total_bytes(dev_item, dev->total_bytes);
@@ -1482,6 +1486,11 @@
list_for_each(cur, head) {
dev = list_entry(cur, struct btrfs_device, dev_list);
+ if (!dev->bdev)
+ continue;
+ if (!dev->in_fs_metadata)
+ continue;
+
BUG_ON(!dev->pending_io);
bh = dev->pending_io;
wait_on_buffer(bh);
@@ -1631,7 +1640,7 @@
kfree(hasher);
}
#endif
- close_all_devices(fs_info);
+ btrfs_close_devices(fs_info->fs_devices);
btrfs_mapping_tree_free(&fs_info->mapping_tree);
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,23)
diff --git a/fs/btrfs/disk-io.h b/fs/btrfs/disk-io.h
index 30d1ed2..2bc64fe 100644
--- a/fs/btrfs/disk-io.h
+++ b/fs/btrfs/disk-io.h
@@ -33,7 +33,8 @@
int clean_tree_block(struct btrfs_trans_handle *trans,
struct btrfs_root *root, struct extent_buffer *buf);
struct btrfs_root *open_ctree(struct super_block *sb,
- struct btrfs_fs_devices *fs_devices);
+ struct btrfs_fs_devices *fs_devices,
+ char *options);
int close_ctree(struct btrfs_root *root);
int write_ctree_super(struct btrfs_trans_handle *trans,
struct btrfs_root *root);
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 020e5a8..273a5b5 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -65,11 +65,13 @@
}
enum {
- Opt_subvol, Opt_nodatasum, Opt_nodatacow, Opt_max_extent,
- Opt_max_inline, Opt_alloc_start, Opt_nobarrier, Opt_ssd, Opt_err,
+ Opt_degraded, Opt_subvol, Opt_nodatasum, Opt_nodatacow,
+ Opt_max_extent, Opt_max_inline, Opt_alloc_start, Opt_nobarrier,
+ Opt_ssd, Opt_err,
};
static match_table_t tokens = {
+ {Opt_degraded, "degraded"},
{Opt_subvol, "subvol=%s"},
{Opt_nodatasum, "nodatasum"},
{Opt_nodatacow, "nodatacow"},
@@ -106,9 +108,8 @@
return res;
}
-static int parse_options (char * options,
- struct btrfs_root *root,
- char **subvol_name)
+int btrfs_parse_options(char *options, struct btrfs_root *root,
+ char **subvol_name)
{
char * p;
struct btrfs_fs_info *info = NULL;
@@ -135,6 +136,12 @@
token = match_token(p, tokens, args);
switch (token) {
+ case Opt_degraded:
+ if (info) {
+ printk("btrfs: allowing degraded mounts\n");
+ btrfs_set_opt(info->mount_opt, DEGRADED);
+ }
+ break;
case Opt_subvol:
if (subvol_name) {
*subvol_name = match_strdup(&args[0]);
@@ -234,7 +241,7 @@
sb->s_xattr = btrfs_xattr_handlers;
sb->s_time_gran = 1;
- tree_root = open_ctree(sb, fs_devices);
+ tree_root = open_ctree(sb, fs_devices, (char *)data);
if (IS_ERR(tree_root)) {
printk("btrfs: open_ctree failed\n");
@@ -267,8 +274,6 @@
goto fail_close;
}
- parse_options((char *)data, tree_root, NULL);
-
/* this does the super kobj at the same time */
err = btrfs_sysfs_add_super(tree_root->fs_info);
if (err)
@@ -341,7 +346,7 @@
if (error)
return error;
- bdev = fs_devices->lowest_bdev;
+ bdev = fs_devices->latest_bdev;
btrfs_lock_volumes();
s = sget(fs_type, btrfs_test_super, set_anon_super, fs_devices);
btrfs_unlock_volumes();
@@ -411,7 +416,7 @@
int ret;
char *subvol_name = NULL;
- parse_options((char *)data, NULL, &subvol_name);
+ btrfs_parse_options((char *)data, NULL, &subvol_name);
ret = btrfs_get_sb_bdev(fs_type, flags, dev_name, data, mnt,
subvol_name ? subvol_name : "default");
if (subvol_name)
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 5fc7fb4..43f74d1 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -73,6 +73,7 @@
close_bdev_excl(dev->bdev);
}
list_del(&dev->dev_list);
+ kfree(dev->name);
kfree(dev);
}
}
@@ -127,7 +128,6 @@
memcpy(fs_devices->fsid, disk_super->fsid, BTRFS_FSID_SIZE);
fs_devices->latest_devid = devid;
fs_devices->latest_trans = found_transid;
- fs_devices->lowest_devid = (u64)-1;
fs_devices->num_devices = 0;
device = NULL;
} else {
@@ -159,13 +159,35 @@
fs_devices->latest_devid = devid;
fs_devices->latest_trans = found_transid;
}
- if (fs_devices->lowest_devid > devid) {
- fs_devices->lowest_devid = devid;
- }
*fs_devices_ret = fs_devices;
return 0;
}
+int btrfs_close_extra_devices(struct btrfs_fs_devices *fs_devices)
+{
+ struct list_head *head = &fs_devices->devices;
+ struct list_head *cur;
+ struct btrfs_device *device;
+
+ mutex_lock(&uuid_mutex);
+again:
+ list_for_each(cur, head) {
+ device = list_entry(cur, struct btrfs_device, dev_list);
+ if (!device->in_fs_metadata) {
+printk("getting rid of extra dev %s\n", device->name);
+ if (device->bdev)
+ close_bdev_excl(device->bdev);
+ list_del(&device->dev_list);
+ list_del(&device->dev_alloc_list);
+ fs_devices->num_devices--;
+ kfree(device->name);
+ kfree(device);
+ goto again;
+ }
+ }
+ mutex_unlock(&uuid_mutex);
+ return 0;
+}
int btrfs_close_devices(struct btrfs_fs_devices *fs_devices)
{
struct list_head *head = &fs_devices->devices;
@@ -179,6 +201,7 @@
close_bdev_excl(device->bdev);
}
device->bdev = NULL;
+ device->in_fs_metadata = 0;
}
mutex_unlock(&uuid_mutex);
return 0;
@@ -199,6 +222,9 @@
if (device->bdev)
continue;
+ if (!device->name)
+ continue;
+
bdev = open_bdev_excl(device->name, flags, holder);
if (IS_ERR(bdev)) {
@@ -209,10 +235,8 @@
set_blocksize(bdev, 4096);
if (device->devid == fs_devices->latest_devid)
fs_devices->latest_bdev = bdev;
- if (device->devid == fs_devices->lowest_devid) {
- fs_devices->lowest_bdev = bdev;
- }
device->bdev = bdev;
+ device->in_fs_metadata = 0;
}
mutex_unlock(&uuid_mutex);
@@ -439,7 +463,8 @@
}
BUG_ON(ret);
- device->bytes_used -= btrfs_dev_extent_length(leaf, extent);
+ if (device->bytes_used > 0)
+ device->bytes_used -= btrfs_dev_extent_length(leaf, extent);
ret = btrfs_del_item(trans, root, path);
BUG_ON(ret);
@@ -460,6 +485,7 @@
struct extent_buffer *leaf;
struct btrfs_key key;
+ WARN_ON(!device->in_fs_metadata);
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
@@ -674,8 +700,6 @@
next_dev = list_entry(fs_devices->devices.next, struct btrfs_device,
dev_list);
- if (bdev == fs_devices->lowest_bdev)
- fs_devices->lowest_bdev = next_dev->bdev;
if (bdev == root->fs_info->sb->s_bdev)
root->fs_info->sb->s_bdev = next_dev->bdev;
if (bdev == fs_devices->latest_bdev)
@@ -698,7 +722,7 @@
{
struct btrfs_device *device;
struct block_device *bdev;
- struct buffer_head *bh;
+ struct buffer_head *bh = NULL;
struct btrfs_super_block *disk_super;
u64 all_avail;
u64 devid;
@@ -712,47 +736,73 @@
root->fs_info->avail_metadata_alloc_bits;
if ((all_avail & BTRFS_BLOCK_GROUP_RAID10) &&
- root->fs_info->fs_devices->num_devices <= 4) {
+ btrfs_super_num_devices(&root->fs_info->super_copy) <= 4) {
printk("btrfs: unable to go below four devices on raid10\n");
ret = -EINVAL;
goto out;
}
if ((all_avail & BTRFS_BLOCK_GROUP_RAID1) &&
- root->fs_info->fs_devices->num_devices <= 2) {
+ btrfs_super_num_devices(&root->fs_info->super_copy) <= 2) {
printk("btrfs: unable to go below two devices on raid1\n");
ret = -EINVAL;
goto out;
}
- bdev = open_bdev_excl(device_path, 0, root->fs_info->bdev_holder);
- if (IS_ERR(bdev)) {
- ret = PTR_ERR(bdev);
- goto out;
- }
+ if (strcmp(device_path, "missing") == 0) {
+ struct list_head *cur;
+ struct list_head *devices;
+ struct btrfs_device *tmp;
- bh = __bread(bdev, BTRFS_SUPER_INFO_OFFSET / 4096, 4096);
- if (!bh) {
- ret = -EIO;
- goto error_close;
- }
- disk_super = (struct btrfs_super_block *)bh->b_data;
- if (strncmp((char *)(&disk_super->magic), BTRFS_MAGIC,
- sizeof(disk_super->magic))) {
- ret = -ENOENT;
- goto error_brelse;
- }
- if (memcmp(disk_super->fsid, root->fs_info->fsid, BTRFS_FSID_SIZE)) {
- ret = -ENOENT;
- goto error_brelse;
- }
- devid = le64_to_cpu(disk_super->dev_item.devid);
- device = btrfs_find_device(root, devid, NULL);
- if (!device) {
- ret = -ENOENT;
- goto error_brelse;
- }
+ device = NULL;
+ devices = &root->fs_info->fs_devices->devices;
+ list_for_each(cur, devices) {
+ tmp = list_entry(cur, struct btrfs_device, dev_list);
+ if (tmp->in_fs_metadata && !tmp->bdev) {
+ device = tmp;
+ break;
+ }
+ }
+ bdev = NULL;
+ bh = NULL;
+ disk_super = NULL;
+ if (!device) {
+ printk("btrfs: no missing devices found to remove\n");
+ goto out;
+ }
+ } else {
+ bdev = open_bdev_excl(device_path, 0,
+ root->fs_info->bdev_holder);
+ if (IS_ERR(bdev)) {
+ ret = PTR_ERR(bdev);
+ goto out;
+ }
+
+ bh = __bread(bdev, BTRFS_SUPER_INFO_OFFSET / 4096, 4096);
+ if (!bh) {
+ ret = -EIO;
+ goto error_close;
+ }
+ disk_super = (struct btrfs_super_block *)bh->b_data;
+ if (strncmp((char *)(&disk_super->magic), BTRFS_MAGIC,
+ sizeof(disk_super->magic))) {
+ ret = -ENOENT;
+ goto error_brelse;
+ }
+ if (memcmp(disk_super->fsid, root->fs_info->fsid,
+ BTRFS_FSID_SIZE)) {
+ ret = -ENOENT;
+ goto error_brelse;
+ }
+ devid = le64_to_cpu(disk_super->dev_item.devid);
+ device = btrfs_find_device(root, devid, NULL);
+ if (!device) {
+ ret = -ENOENT;
+ goto error_brelse;
+ }
+
+ }
root->fs_info->fs_devices->num_devices--;
ret = btrfs_shrink_device(device, 0);
@@ -764,19 +814,25 @@
if (ret)
goto error_brelse;
- /* make sure this device isn't detected as part of the FS anymore */
- memset(&disk_super->magic, 0, sizeof(disk_super->magic));
- set_buffer_dirty(bh);
- sync_dirty_buffer(bh);
+ if (bh) {
+ /* make sure this device isn't detected as part of
+ * the FS anymore
+ */
+ memset(&disk_super->magic, 0, sizeof(disk_super->magic));
+ set_buffer_dirty(bh);
+ sync_dirty_buffer(bh);
- brelse(bh);
+ brelse(bh);
+ }
- /* one close for the device struct or super_block */
- close_bdev_excl(device->bdev);
-
- /* one close for us */
- close_bdev_excl(device->bdev);
-
+ if (device->bdev) {
+ /* one close for the device struct or super_block */
+ close_bdev_excl(device->bdev);
+ }
+ if (bdev) {
+ /* one close for us */
+ close_bdev_excl(bdev);
+ }
kfree(device->name);
kfree(device);
ret = 0;
@@ -785,7 +841,8 @@
error_brelse:
brelse(bh);
error_close:
- close_bdev_excl(bdev);
+ if (bdev)
+ close_bdev_excl(bdev);
out:
mutex_unlock(&uuid_mutex);
mutex_unlock(&root->fs_info->fs_mutex);
@@ -839,6 +896,7 @@
device->total_bytes = i_size_read(bdev->bd_inode);
device->dev_root = root->fs_info->dev_root;
device->bdev = bdev;
+ device->in_fs_metadata = 1;
ret = btrfs_add_device(trans, root, device);
if (ret)
@@ -1041,8 +1099,10 @@
map->stripes[i].physical);
BUG_ON(ret);
- ret = btrfs_update_device(trans, map->stripes[i].dev);
- BUG_ON(ret);
+ if (map->stripes[i].dev) {
+ ret = btrfs_update_device(trans, map->stripes[i].dev);
+ BUG_ON(ret);
+ }
}
ret = btrfs_free_chunk(trans, root, chunk_tree, chunk_objectid,
chunk_offset);
@@ -1415,10 +1475,13 @@
while(index < num_stripes) {
device = list_entry(cur, struct btrfs_device, dev_alloc_list);
- avail = device->total_bytes - device->bytes_used;
+ if (device->total_bytes > device->bytes_used)
+ avail = device->total_bytes - device->bytes_used;
+ else
+ avail = 0;
cur = cur->next;
- if (avail >= min_free) {
+ if (device->in_fs_metadata && avail >= min_free) {
u64 ignored_start = 0;
ret = find_free_dev_extent(trans, device, path,
min_free,
@@ -1430,7 +1493,7 @@
if (type & BTRFS_BLOCK_GROUP_DUP)
index++;
}
- } else if (avail > max_avail)
+ } else if (device->in_fs_metadata && avail > max_avail)
max_avail = avail;
if (cur == dev_list)
break;
@@ -1610,6 +1673,22 @@
return ret;
}
+static int find_live_mirror(struct map_lookup *map, int first, int num,
+ int optimal)
+{
+ int i;
+ if (map->stripes[optimal].dev->bdev)
+ return optimal;
+ for (i = first; i < first + num; i++) {
+ if (map->stripes[i].dev->bdev)
+ return i;
+ }
+ /* we couldn't find one that doesn't fail. Just return something
+ * and the io error handling code will clean up eventually
+ */
+ return optimal;
+}
+
static int __btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw,
u64 logical, u64 *length,
struct btrfs_multi_bio **multi_ret,
@@ -1712,8 +1791,11 @@
num_stripes = map->num_stripes;
else if (mirror_num)
stripe_index = mirror_num - 1;
- else
- stripe_index = current->pid % map->num_stripes;
+ else {
+ stripe_index = find_live_mirror(map, 0,
+ map->num_stripes,
+ current->pid % map->num_stripes);
+ }
} else if (map->type & BTRFS_BLOCK_GROUP_DUP) {
if (rw & (1 << BIO_RW))
@@ -1731,8 +1813,11 @@
num_stripes = map->sub_stripes;
else if (mirror_num)
stripe_index += mirror_num - 1;
- else
- stripe_index += current->pid % map->sub_stripes;
+ else {
+ stripe_index = find_live_mirror(map, stripe_index,
+ map->sub_stripes, stripe_index +
+ current->pid % map->sub_stripes);
+ }
} else {
/*
* after this do_div call, stripe_nr is the number of stripes
@@ -1749,9 +1834,11 @@
struct backing_dev_info *bdi;
device = map->stripes[stripe_index].dev;
- bdi = blk_get_backing_dev_info(device->bdev);
- if (bdi->unplug_io_fn) {
- bdi->unplug_io_fn(bdi, unplug_page);
+ if (device->bdev) {
+ bdi = blk_get_backing_dev_info(device->bdev);
+ if (bdi->unplug_io_fn) {
+ bdi->unplug_io_fn(bdi, unplug_page);
+ }
}
} else {
multi->stripes[i].physical =
@@ -1880,12 +1967,21 @@
}
bio->bi_sector = multi->stripes[dev_nr].physical >> 9;
dev = multi->stripes[dev_nr].dev;
-
- bio->bi_bdev = dev->bdev;
- spin_lock(&dev->io_lock);
- dev->total_ios++;
- spin_unlock(&dev->io_lock);
- submit_bio(rw, bio);
+ if (dev && dev->bdev) {
+ bio->bi_bdev = dev->bdev;
+ spin_lock(&dev->io_lock);
+ dev->total_ios++;
+ spin_unlock(&dev->io_lock);
+ submit_bio(rw, bio);
+ } else {
+ bio->bi_bdev = root->fs_info->fs_devices->latest_bdev;
+ bio->bi_sector = logical >> 9;
+#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23)
+ bio_endio(bio, bio->bi_size, -EIO);
+#else
+ bio_endio(bio, -EIO);
+#endif
+ }
dev_nr++;
}
if (total_devs == 1)
@@ -1901,6 +1997,27 @@
return __find_device(head, devid, uuid);
}
+static struct btrfs_device *add_missing_dev(struct btrfs_root *root,
+ u64 devid, u8 *dev_uuid)
+{
+ struct btrfs_device *device;
+ struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices;
+
+ device = kzalloc(sizeof(*device), GFP_NOFS);
+ list_add(&device->dev_list,
+ &fs_devices->devices);
+ list_add(&device->dev_alloc_list,
+ &fs_devices->alloc_list);
+ device->barriers = 1;
+ device->dev_root = root->fs_info->dev_root;
+ device->devid = devid;
+ fs_devices->num_devices++;
+ spin_lock_init(&device->io_lock);
+ memcpy(device->uuid, dev_uuid, BTRFS_UUID_SIZE);
+ return device;
+}
+
+
static int read_one_chunk(struct btrfs_root *root, struct btrfs_key *key,
struct extent_buffer *leaf,
struct btrfs_chunk *chunk)
@@ -1965,11 +2082,22 @@
btrfs_stripe_dev_uuid_nr(chunk, i),
BTRFS_UUID_SIZE);
map->stripes[i].dev = btrfs_find_device(root, devid, uuid);
- if (!map->stripes[i].dev) {
+
+ if (!map->stripes[i].dev && !btrfs_test_opt(root, DEGRADED)) {
kfree(map);
free_extent_map(em);
return -EIO;
}
+ if (!map->stripes[i].dev) {
+ map->stripes[i].dev =
+ add_missing_dev(root, devid, uuid);
+ if (!map->stripes[i].dev) {
+ kfree(map);
+ free_extent_map(em);
+ return -EIO;
+ }
+ }
+ map->stripes[i].dev->in_fs_metadata = 1;
}
spin_lock(&map_tree->map_tree.lock);
@@ -2016,20 +2144,15 @@
BTRFS_UUID_SIZE);
device = btrfs_find_device(root, devid, dev_uuid);
if (!device) {
- printk("warning devid %Lu not found already\n", devid);
- device = kzalloc(sizeof(*device), GFP_NOFS);
+ printk("warning devid %Lu missing\n", devid);
+ device = add_missing_dev(root, devid, dev_uuid);
if (!device)
return -ENOMEM;
- list_add(&device->dev_list,
- &root->fs_info->fs_devices->devices);
- list_add(&device->dev_alloc_list,
- &root->fs_info->fs_devices->alloc_list);
- device->barriers = 1;
- spin_lock_init(&device->io_lock);
}
fill_device_from_item(leaf, dev_item, device);
device->dev_root = root->fs_info->dev_root;
+ device->in_fs_metadata = 1;
ret = 0;
#if 0
ret = btrfs_open_device(device);
diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h
index 0f94a69..454fe81 100644
--- a/fs/btrfs/volumes.h
+++ b/fs/btrfs/volumes.h
@@ -27,8 +27,10 @@
struct list_head dev_alloc_list;
struct btrfs_root *dev_root;
struct buffer_head *pending_io;
+ u64 generation;
int barriers;
+ int in_fs_metadata;
spinlock_t io_lock;
@@ -122,6 +124,7 @@
int btrfs_scan_one_device(const char *path, int flags, void *holder,
struct btrfs_fs_devices **fs_devices_ret);
int btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
+int btrfs_close_extra_devices(struct btrfs_fs_devices *fs_devices);
int btrfs_add_device(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct btrfs_device *device);