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Btrfs: Add mount -o degraded to allow mounts to continue with missing devices

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Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2008-05-13 13:46:40 -04:00
parent 1259ab75c6
commit dfe2502068
6 changed files with 253 additions and 109 deletions
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3
fs/btrfs/ctree.h
View File

@ -657,6 +657,7 @@ struct btrfs_root {
#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 @@ int btrfs_delete_xattrs(struct btrfs_trans_handle *trans,
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

49
fs/btrfs/disk-io.c
View File

@ -614,21 +614,6 @@ int readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize,
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 @@ static int btrfs_congested_fn(void *congested_data, int bdi_bits)
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 @@ static void btrfs_async_submit_work(struct work_struct *work)
}
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 @@ struct btrfs_root *open_ctree(struct super_block *sb,
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 @@ struct btrfs_root *open_ctree(struct super_block *sb,
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_sb_buffer:
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 @@ int write_all_supers(struct btrfs_root *root)
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 @@ int write_all_supers(struct btrfs_root *root)
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 @@ int close_ctree(struct btrfs_root *root)
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)

3
fs/btrfs/disk-io.h
View File

@ -33,7 +33,8 @@ struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root,
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);

25
fs/btrfs/super.c
View File

@ -65,11 +65,13 @@ static void btrfs_put_super (struct super_block * sb)
}
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 @@ u64 btrfs_parse_size(char *str)
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 @@ static int parse_options (char * options,
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 @@ static int btrfs_fill_super(struct super_block * sb,
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 @@ static int btrfs_fill_super(struct super_block * sb,
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 @@ int btrfs_get_sb_bdev(struct file_system_type *fs_type,
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 @@ static int btrfs_get_sb(struct file_system_type *fs_type,
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)

279
fs/btrfs/volumes.c
View File

@ -73,6 +73,7 @@ int btrfs_cleanup_fs_uuids(void)
close_bdev_excl(dev->bdev);
}
list_del(&dev->dev_list);
kfree(dev->name);
kfree(dev);
}
}
@ -127,7 +128,6 @@ static int device_list_add(const char *path,
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 @@ static int device_list_add(const char *path,
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 @@ int btrfs_close_devices(struct btrfs_fs_devices *fs_devices)
close_bdev_excl(device->bdev);
}
device->bdev = NULL;
device->in_fs_metadata = 0;
}
mutex_unlock(&uuid_mutex);
return 0;
@ -199,6 +222,9 @@ int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
if (device->bdev)
continue;
if (!device->name)
continue;
bdev = open_bdev_excl(device->name, flags, holder);
if (IS_ERR(bdev)) {
@ -209,10 +235,8 @@ int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
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 @@ int btrfs_free_dev_extent(struct btrfs_trans_handle *trans,
}
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 @@ int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans,
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 @@ static int btrfs_rm_dev_item(struct btrfs_root *root,
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 @@ int btrfs_rm_device(struct btrfs_root *root, char *device_path)
{
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 @@ int btrfs_rm_device(struct btrfs_root *root, char *device_path)
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 @@ int btrfs_rm_device(struct btrfs_root *root, char *device_path)
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);
/* one close for the device struct or super_block */
close_bdev_excl(device->bdev);
/* one close for us */
close_bdev_excl(device->bdev);
brelse(bh);
}
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 @@ int btrfs_rm_device(struct btrfs_root *root, char *device_path)
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 @@ int btrfs_init_new_device(struct btrfs_root *root, char *device_path)
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 @@ int btrfs_relocate_chunk(struct btrfs_root *root,
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 @@ again:
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 @@ again:
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 @@ int btrfs_num_copies(struct btrfs_mapping_tree *map_tree, u64 logical, u64 len)
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 @@ again:
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 @@ again:
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 @@ again:
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 @@ int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio,
}
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 @@ struct btrfs_device *btrfs_find_device(struct btrfs_root *root, u64 devid,
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 @@ static int read_one_chunk(struct btrfs_root *root, struct btrfs_key *key,
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 @@ static int read_one_dev(struct btrfs_root *root,
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);

3
fs/btrfs/volumes.h
View File

@ -27,8 +27,10 @@ struct btrfs_device {
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_open_devices(struct btrfs_fs_devices *fs_devices,
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);