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-rw-r--r--fs/btrfs/ctree.h3
-rw-r--r--fs/btrfs/disk-io.c101
-rw-r--r--fs/btrfs/extent-tree.c139
-rw-r--r--fs/btrfs/inode.c27
-rw-r--r--fs/btrfs/super.c35
-rw-r--r--fs/btrfs/transaction.c5
-rw-r--r--fs/btrfs/volumes.c221
-rw-r--r--fs/btrfs/volumes.h3
8 files changed, 412 insertions, 122 deletions
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 3b6f852..33ab165 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -505,7 +505,7 @@ struct btrfs_fs_info {
u64 alloc_start;
struct btrfs_transaction *running_transaction;
struct btrfs_super_block super_copy;
- struct extent_buffer *sb_buffer;
+ struct btrfs_super_block super_for_commit;
struct block_device *__bdev;
struct super_block *sb;
struct inode *btree_inode;
@@ -1208,6 +1208,7 @@ BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64);
/* struct btrfs_super_block */
BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64);
+BTRFS_SETGET_STACK_FUNCS(super_flags, struct btrfs_super_block, flags, 64);
BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
generation, 64);
BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index fabc31b..9d5424a 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -78,9 +78,13 @@ struct extent_map *btree_get_extent(struct inode *inode, struct page *page,
spin_lock(&em_tree->lock);
em = lookup_extent_mapping(em_tree, start, len);
- spin_unlock(&em_tree->lock);
- if (em)
+ if (em) {
+ em->bdev =
+ BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev;
+ spin_unlock(&em_tree->lock);
goto out;
+ }
+ spin_unlock(&em_tree->lock);
em = alloc_extent_map(GFP_NOFS);
if (!em) {
@@ -90,7 +94,7 @@ struct extent_map *btree_get_extent(struct inode *inode, struct page *page,
em->start = 0;
em->len = (u64)-1;
em->block_start = 0;
- em->bdev = inode->i_sb->s_bdev;
+ em->bdev = BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev;
spin_lock(&em_tree->lock);
ret = add_extent_mapping(em_tree, em);
@@ -435,11 +439,6 @@ static int __btree_submit_bio_hook(struct inode *inode, int rw, struct bio *bio,
ret = btrfs_bio_wq_end_io(root->fs_info, bio, 1);
BUG_ON(ret);
- if (offset == BTRFS_SUPER_INFO_OFFSET) {
- bio->bi_bdev = root->fs_info->fs_devices->latest_bdev;
- submit_bio(rw, bio);
- return 0;
- }
return btrfs_map_bio(BTRFS_I(inode)->root, rw, bio, mirror_num);
}
@@ -587,8 +586,7 @@ static int close_all_devices(struct btrfs_fs_info *fs_info)
list = &fs_info->fs_devices->devices;
list_for_each(next, list) {
device = list_entry(next, struct btrfs_device, dev_list);
- if (device->bdev && device->bdev != fs_info->sb->s_bdev)
- close_bdev_excl(device->bdev);
+ close_bdev_excl(device->bdev);
device->bdev = NULL;
}
return 0;
@@ -1118,6 +1116,7 @@ struct btrfs_root *open_ctree(struct super_block *sb,
u32 leafsize;
u32 blocksize;
u32 stripesize;
+ struct buffer_head *bh;
struct btrfs_root *extent_root = kmalloc(sizeof(struct btrfs_root),
GFP_NOFS);
struct btrfs_root *tree_root = kmalloc(sizeof(struct btrfs_root),
@@ -1153,7 +1152,6 @@ struct btrfs_root *open_ctree(struct super_block *sb,
spin_lock_init(&fs_info->new_trans_lock);
init_completion(&fs_info->kobj_unregister);
- sb_set_blocksize(sb, BTRFS_SUPER_INFO_SIZE);
fs_info->tree_root = tree_root;
fs_info->extent_root = extent_root;
fs_info->chunk_root = chunk_root;
@@ -1170,6 +1168,9 @@ struct btrfs_root *open_ctree(struct super_block *sb,
fs_info->btree_inode->i_ino = 1;
fs_info->btree_inode->i_nlink = 1;
+ sb->s_blocksize = 4096;
+ sb->s_blocksize_bits = blksize_bits(4096);
+
/*
* we set the i_size on the btree inode to the max possible int.
* the real end of the address space is determined by all of
@@ -1229,19 +1230,16 @@ struct btrfs_root *open_ctree(struct super_block *sb,
__setup_root(4096, 4096, 4096, 4096, tree_root,
fs_info, BTRFS_ROOT_TREE_OBJECTID);
- fs_info->sb_buffer = read_tree_block(tree_root,
- BTRFS_SUPER_INFO_OFFSET,
- 4096);
- if (!fs_info->sb_buffer)
+ bh = __bread(fs_devices->latest_bdev,
+ BTRFS_SUPER_INFO_OFFSET / 4096, 4096);
+ if (!bh)
goto fail_iput;
- read_extent_buffer(fs_info->sb_buffer, &fs_info->super_copy, 0,
- sizeof(fs_info->super_copy));
+ memcpy(&fs_info->super_copy, bh->b_data, sizeof(fs_info->super_copy));
+ brelse(bh);
- read_extent_buffer(fs_info->sb_buffer, fs_info->fsid,
- (unsigned long)btrfs_super_fsid(fs_info->sb_buffer),
- BTRFS_FSID_SIZE);
+ memcpy(fs_info->fsid, fs_info->super_copy.fsid, BTRFS_FSID_SIZE);
disk_super = &fs_info->super_copy;
if (!btrfs_super_root(disk_super))
@@ -1263,7 +1261,9 @@ struct btrfs_root *open_ctree(struct super_block *sb,
tree_root->leafsize = leafsize;
tree_root->sectorsize = sectorsize;
tree_root->stripesize = stripesize;
- sb_set_blocksize(sb, sectorsize);
+
+ sb->s_blocksize = sectorsize;
+ sb->s_blocksize_bits = blksize_bits(sectorsize);
if (strncmp((char *)(&disk_super->magic), BTRFS_MAGIC,
sizeof(disk_super->magic))) {
@@ -1339,7 +1339,6 @@ fail_tree_root:
fail_sys_array:
mutex_unlock(&fs_info->fs_mutex);
fail_sb_buffer:
- free_extent_buffer(fs_info->sb_buffer);
extent_io_tree_empty_lru(&BTRFS_I(fs_info->btree_inode)->io_tree);
fail_iput:
iput(fs_info->btree_inode);
@@ -1380,41 +1379,44 @@ int write_all_supers(struct btrfs_root *root)
struct list_head *cur;
struct list_head *head = &root->fs_info->fs_devices->devices;
struct btrfs_device *dev;
- struct extent_buffer *sb;
+ struct btrfs_super_block *sb;
struct btrfs_dev_item *dev_item;
struct buffer_head *bh;
int ret;
int do_barriers;
int max_errors;
int total_errors = 0;
+ u32 crc;
+ u64 flags;
max_errors = btrfs_super_num_devices(&root->fs_info->super_copy) - 1;
do_barriers = !btrfs_test_opt(root, NOBARRIER);
- sb = root->fs_info->sb_buffer;
- dev_item = (struct btrfs_dev_item *)offsetof(struct btrfs_super_block,
- dev_item);
+ sb = &root->fs_info->super_for_commit;
+ dev_item = &sb->dev_item;
list_for_each(cur, head) {
dev = list_entry(cur, struct btrfs_device, dev_list);
- btrfs_set_device_type(sb, dev_item, dev->type);
- btrfs_set_device_id(sb, dev_item, dev->devid);
- btrfs_set_device_total_bytes(sb, dev_item, dev->total_bytes);
- btrfs_set_device_bytes_used(sb, dev_item, dev->bytes_used);
- btrfs_set_device_io_align(sb, dev_item, dev->io_align);
- btrfs_set_device_io_width(sb, dev_item, dev->io_width);
- btrfs_set_device_sector_size(sb, dev_item, dev->sector_size);
- write_extent_buffer(sb, dev->uuid,
- (unsigned long)btrfs_device_uuid(dev_item),
- BTRFS_UUID_SIZE);
-
- btrfs_set_header_flag(sb, BTRFS_HEADER_FLAG_WRITTEN);
- csum_tree_block(root, sb, 0);
-
- bh = __getblk(dev->bdev, BTRFS_SUPER_INFO_OFFSET /
- root->fs_info->sb->s_blocksize,
+ 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);
+ btrfs_set_stack_device_bytes_used(dev_item, dev->bytes_used);
+ btrfs_set_stack_device_io_align(dev_item, dev->io_align);
+ btrfs_set_stack_device_io_width(dev_item, dev->io_width);
+ btrfs_set_stack_device_sector_size(dev_item, dev->sector_size);
+ memcpy(dev_item->uuid, dev->uuid, BTRFS_UUID_SIZE);
+ flags = btrfs_super_flags(sb);
+ btrfs_set_super_flags(sb, flags | BTRFS_HEADER_FLAG_WRITTEN);
+
+
+ crc = ~(u32)0;
+ crc = btrfs_csum_data(root, (char *)sb + BTRFS_CSUM_SIZE, crc,
+ BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
+ btrfs_csum_final(crc, sb->csum);
+
+ bh = __getblk(dev->bdev, BTRFS_SUPER_INFO_OFFSET / 4096,
BTRFS_SUPER_INFO_SIZE);
- read_extent_buffer(sb, bh->b_data, 0, BTRFS_SUPER_INFO_SIZE);
+ memcpy(bh->b_data, sb, BTRFS_SUPER_INFO_SIZE);
dev->pending_io = bh;
get_bh(bh);
@@ -1483,15 +1485,6 @@ int write_ctree_super(struct btrfs_trans_handle *trans, struct btrfs_root
int ret;
ret = write_all_supers(root);
-#if 0
- if (!btrfs_test_opt(root, NOBARRIER))
- blkdev_issue_flush(sb->s_bdev, NULL);
- set_extent_buffer_dirty(&BTRFS_I(btree_inode)->io_tree, super);
- ret = sync_page_range_nolock(btree_inode, btree_inode->i_mapping,
- super->start, super->len);
- if (!btrfs_test_opt(root, NOBARRIER))
- blkdev_issue_flush(sb->s_bdev, NULL);
-#endif
return ret;
}
@@ -1570,8 +1563,6 @@ int close_ctree(struct btrfs_root *root)
if (root->fs_info->dev_root->node);
free_extent_buffer(root->fs_info->dev_root->node);
- free_extent_buffer(fs_info->sb_buffer);
-
btrfs_free_block_groups(root->fs_info);
del_fs_roots(fs_info);
@@ -1652,7 +1643,7 @@ void btrfs_throttle(struct btrfs_root *root)
{
struct backing_dev_info *bdi;
- bdi = root->fs_info->sb->s_bdev->bd_inode->i_mapping->backing_dev_info;
+ bdi = &root->fs_info->bdi;
if (root->fs_info->throttles && bdi_write_congested(bdi)) {
#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,18)
congestion_wait(WRITE, HZ/20);
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index f94794a..c0e67bd 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -147,6 +147,8 @@ struct btrfs_block_group_cache *btrfs_lookup_block_group(struct
u64 end;
int ret;
+ bytenr = max_t(u64, bytenr,
+ BTRFS_SUPER_INFO_OFFSET + BTRFS_SUPER_INFO_SIZE);
block_group_cache = &info->block_group_cache;
ret = find_first_extent_bit(block_group_cache,
bytenr, &start, &end,
@@ -1059,16 +1061,25 @@ static void set_avail_alloc_bits(struct btrfs_fs_info *fs_info, u64 flags)
}
}
-static u64 reduce_alloc_profile(u64 flags)
+static u64 reduce_alloc_profile(struct btrfs_root *root, u64 flags)
{
+ u64 num_devices = root->fs_info->fs_devices->num_devices;
+
+ if (num_devices == 1)
+ flags &= ~(BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID0);
+ if (num_devices < 4)
+ flags &= ~BTRFS_BLOCK_GROUP_RAID10;
+
if ((flags & BTRFS_BLOCK_GROUP_DUP) &&
(flags & (BTRFS_BLOCK_GROUP_RAID1 |
- BTRFS_BLOCK_GROUP_RAID10)))
+ BTRFS_BLOCK_GROUP_RAID10))) {
flags &= ~BTRFS_BLOCK_GROUP_DUP;
+ }
if ((flags & BTRFS_BLOCK_GROUP_RAID1) &&
- (flags & BTRFS_BLOCK_GROUP_RAID10))
+ (flags & BTRFS_BLOCK_GROUP_RAID10)) {
flags &= ~BTRFS_BLOCK_GROUP_RAID1;
+ }
if ((flags & BTRFS_BLOCK_GROUP_RAID0) &&
((flags & BTRFS_BLOCK_GROUP_RAID1) |
@@ -1078,7 +1089,6 @@ static u64 reduce_alloc_profile(u64 flags)
return flags;
}
-
static int do_chunk_alloc(struct btrfs_trans_handle *trans,
struct btrfs_root *extent_root, u64 alloc_bytes,
u64 flags)
@@ -1089,7 +1099,7 @@ static int do_chunk_alloc(struct btrfs_trans_handle *trans,
u64 num_bytes;
int ret;
- flags = reduce_alloc_profile(flags);
+ flags = reduce_alloc_profile(extent_root, flags);
space_info = __find_space_info(extent_root->fs_info, flags);
if (!space_info) {
@@ -1169,6 +1179,21 @@ static int update_block_group(struct btrfs_trans_handle *trans,
return 0;
}
+static u64 first_logical_byte(struct btrfs_root *root, u64 search_start)
+{
+ u64 start;
+ u64 end;
+ int ret;
+ ret = find_first_extent_bit(&root->fs_info->block_group_cache,
+ search_start, &start, &end,
+ BLOCK_GROUP_DATA | BLOCK_GROUP_METADATA |
+ BLOCK_GROUP_SYSTEM);
+ if (ret)
+ return 0;
+ return start;
+}
+
+
static int update_pinned_extents(struct btrfs_root *root,
u64 bytenr, u64 num, int pin)
{
@@ -1185,16 +1210,25 @@ static int update_pinned_extents(struct btrfs_root *root,
}
while (num > 0) {
cache = btrfs_lookup_block_group(fs_info, bytenr);
- WARN_ON(!cache);
- len = min(num, cache->key.offset -
- (bytenr - cache->key.objectid));
+ if (!cache) {
+ u64 first = first_logical_byte(root, bytenr);
+ WARN_ON(first < bytenr);
+ len = min(first - bytenr, num);
+ } else {
+ len = min(num, cache->key.offset -
+ (bytenr - cache->key.objectid));
+ }
if (pin) {
- cache->pinned += len;
- cache->space_info->bytes_pinned += len;
+ if (cache) {
+ cache->pinned += len;
+ cache->space_info->bytes_pinned += len;
+ }
fs_info->total_pinned += len;
} else {
- cache->pinned -= len;
- cache->space_info->bytes_pinned -= len;
+ if (cache) {
+ cache->pinned -= len;
+ cache->space_info->bytes_pinned -= len;
+ }
fs_info->total_pinned -= len;
}
bytenr += len;
@@ -1547,7 +1581,7 @@ static int noinline find_free_extent(struct btrfs_trans_handle *trans,
int data)
{
int ret;
- u64 orig_search_start = search_start;
+ u64 orig_search_start;
struct btrfs_root * root = orig_root->fs_info->extent_root;
struct btrfs_fs_info *info = root->fs_info;
u64 total_needed = num_bytes;
@@ -1577,6 +1611,9 @@ static int noinline find_free_extent(struct btrfs_trans_handle *trans,
}
}
+ search_start = max(search_start, first_logical_byte(root, 0));
+ orig_search_start = search_start;
+
if (search_end == (u64)-1)
search_end = btrfs_super_total_bytes(&info->super_copy);
@@ -1751,7 +1788,7 @@ int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
data = BTRFS_BLOCK_GROUP_METADATA | alloc_profile;
}
again:
- data = reduce_alloc_profile(data);
+ data = reduce_alloc_profile(root, data);
if (root->ref_cows) {
if (!(data & BTRFS_BLOCK_GROUP_METADATA)) {
ret = do_chunk_alloc(trans, root->fs_info->extent_root,
@@ -2309,6 +2346,7 @@ static int noinline relocate_inode_pages(struct inode *inode, u64 start,
struct file_ra_state *ra;
unsigned long total_read = 0;
unsigned long ra_pages;
+ struct btrfs_trans_handle *trans;
ra = kzalloc(sizeof(*ra), GFP_NOFS);
@@ -2326,9 +2364,13 @@ static int noinline relocate_inode_pages(struct inode *inode, u64 start,
calc_ra(i, last_index, ra_pages));
}
total_read++;
+ if (((u64)i << PAGE_CACHE_SHIFT) > inode->i_size)
+ goto truncate_racing;
+
page = grab_cache_page(inode->i_mapping, i);
- if (!page)
+ if (!page) {
goto out_unlock;
+ }
if (!PageUptodate(page)) {
btrfs_readpage(NULL, page);
lock_page(page);
@@ -2350,20 +2392,33 @@ static int noinline relocate_inode_pages(struct inode *inode, u64 start,
lock_extent(io_tree, page_start, page_end, GFP_NOFS);
- set_page_dirty(page);
set_extent_delalloc(io_tree, page_start,
page_end, GFP_NOFS);
+ set_page_dirty(page);
unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
unlock_page(page);
page_cache_release(page);
- balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1);
}
+ balance_dirty_pages_ratelimited_nr(inode->i_mapping,
+ total_read);
out_unlock:
kfree(ra);
+ trans = btrfs_start_transaction(BTRFS_I(inode)->root, 1);
+ if (trans) {
+ btrfs_add_ordered_inode(inode);
+ btrfs_end_transaction(trans, BTRFS_I(inode)->root);
+ mark_inode_dirty(inode);
+ }
mutex_unlock(&inode->i_mutex);
return 0;
+
+truncate_racing:
+ vmtruncate(inode, inode->i_size);
+ balance_dirty_pages_ratelimited_nr(inode->i_mapping,
+ total_read);
+ goto out_unlock;
}
/*
@@ -2466,6 +2521,27 @@ out:
return 0;
}
+static int noinline del_extent_zero(struct btrfs_root *extent_root,
+ struct btrfs_path *path,
+ struct btrfs_key *extent_key)
+{
+ int ret;
+ struct btrfs_trans_handle *trans;
+
+ trans = btrfs_start_transaction(extent_root, 1);
+ ret = btrfs_search_slot(trans, extent_root, extent_key, path, -1, 1);
+ if (ret > 0) {
+ ret = -EIO;
+ goto out;
+ }
+ if (ret < 0)
+ goto out;
+ ret = btrfs_del_item(trans, extent_root, path);
+out:
+ btrfs_end_transaction(trans, extent_root);
+ return ret;
+}
+
static int noinline relocate_one_extent(struct btrfs_root *extent_root,
struct btrfs_path *path,
struct btrfs_key *extent_key)
@@ -2477,6 +2553,10 @@ static int noinline relocate_one_extent(struct btrfs_root *extent_root,
u32 item_size;
int ret = 0;
+ if (extent_key->objectid == 0) {
+ ret = del_extent_zero(extent_root, path, extent_key);
+ goto out;
+ }
key.objectid = extent_key->objectid;
key.type = BTRFS_EXTENT_REF_KEY;
key.offset = 0;
@@ -2490,15 +2570,24 @@ static int noinline relocate_one_extent(struct btrfs_root *extent_root,
ret = 0;
leaf = path->nodes[0];
nritems = btrfs_header_nritems(leaf);
- if (path->slots[0] == nritems)
- goto out;
+ if (path->slots[0] == nritems) {
+ ret = btrfs_next_leaf(extent_root, path);
+ if (ret > 0) {
+ ret = 0;
+ goto out;
+ }
+ if (ret < 0)
+ goto out;
+ }
btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
- if (found_key.objectid != extent_key->objectid)
+ if (found_key.objectid != extent_key->objectid) {
break;
+ }
- if (found_key.type != BTRFS_EXTENT_REF_KEY)
+ if (found_key.type != BTRFS_EXTENT_REF_KEY) {
break;
+ }
key.offset = found_key.offset + 1;
item_size = btrfs_item_size_nr(leaf, path->slots[0]);
@@ -2519,7 +2608,7 @@ static u64 update_block_group_flags(struct btrfs_root *root, u64 flags)
u64 stripped = BTRFS_BLOCK_GROUP_RAID0 |
BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID10;
- num_devices = btrfs_super_num_devices(&root->fs_info->super_copy);
+ num_devices = root->fs_info->fs_devices->num_devices;
if (num_devices == 1) {
stripped |= BTRFS_BLOCK_GROUP_DUP;
stripped = flags & ~stripped;
@@ -2535,9 +2624,6 @@ static u64 update_block_group_flags(struct btrfs_root *root, u64 flags)
return flags;
} else {
/* they already had raid on here, just return */
- if ((flags & BTRFS_BLOCK_GROUP_DUP) &&
- (flags & BTRFS_BLOCK_GROUP_RAID1)) {
- }
if (flags & stripped)
return flags;
@@ -2570,7 +2656,7 @@ int btrfs_shrink_extent_tree(struct btrfs_root *root, u64 shrink_start)
struct extent_buffer *leaf;
u32 nritems;
int ret;
- int progress = 0;
+ int progress;
shrink_block_group = btrfs_lookup_block_group(root->fs_info,
shrink_start);
@@ -2597,6 +2683,7 @@ again:
shrink_block_group->ro = 1;
total_found = 0;
+ progress = 0;
key.objectid = shrink_start;
key.offset = 0;
key.type = 0;
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index f7beb9b..b437d3b 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -2194,6 +2194,8 @@ struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
again:
spin_lock(&em_tree->lock);
em = lookup_extent_mapping(em_tree, start, len);
+ if (em)
+ em->bdev = root->fs_info->fs_devices->latest_bdev;
spin_unlock(&em_tree->lock);
if (em) {
@@ -2212,7 +2214,7 @@ again:
em->start = EXTENT_MAP_HOLE;
em->len = (u64)-1;
- em->bdev = inode->i_sb->s_bdev;
+ em->bdev = root->fs_info->fs_devices->latest_bdev;
ret = btrfs_lookup_file_extent(trans, root, path,
objectid, start, trans != NULL);
if (ret < 0) {
@@ -3101,6 +3103,27 @@ out:
return ret;
}
+long btrfs_ioctl_rm_dev(struct btrfs_root *root, void __user *arg)
+{
+ struct btrfs_ioctl_vol_args *vol_args;
+ int ret;
+
+ vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);
+
+ if (!vol_args)
+ return -ENOMEM;
+
+ if (copy_from_user(vol_args, arg, sizeof(*vol_args))) {
+ ret = -EFAULT;
+ goto out;
+ }
+ ret = btrfs_rm_device(root, vol_args->name);
+
+out:
+ kfree(vol_args);
+ return ret;
+}
+
int dup_item_to_inode(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct btrfs_path *path,
@@ -3294,6 +3317,8 @@ long btrfs_ioctl(struct file *file, unsigned int
return btrfs_ioctl_resize(root, (void __user *)arg);
case BTRFS_IOC_ADD_DEV:
return btrfs_ioctl_add_dev(root, (void __user *)arg);
+ case BTRFS_IOC_RM_DEV:
+ return btrfs_ioctl_rm_dev(root, (void __user *)arg);
case BTRFS_IOC_BALANCE:
return btrfs_balance(root->fs_info->dev_root);
case BTRFS_IOC_CLONE:
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 7153dfa..020e5a8 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -315,24 +315,12 @@ static void btrfs_write_super(struct super_block *sb)
sb->s_dirt = 0;
}
-/*
- * This is almost a copy of get_sb_bdev in fs/super.c.
- * We need the local copy to allow direct mounting of
- * subvolumes, but this could be easily integrated back
- * into the generic version. --hch
- */
-
-/* start copy & paste */
-static int set_bdev_super(struct super_block *s, void *data)
+static int btrfs_test_super(struct super_block *s, void *data)
{
- s->s_bdev = data;
- s->s_dev = s->s_bdev->bd_dev;
- return 0;
-}
+ struct btrfs_fs_devices *test_fs_devices = data;
+ struct btrfs_root *root = btrfs_sb(s);
-static int test_bdev_super(struct super_block *s, void *data)
-{
- return (void *)s->s_bdev == data;
+ return root->fs_info->fs_devices == test_fs_devices;
}
int btrfs_get_sb_bdev(struct file_system_type *fs_type,
@@ -354,14 +342,9 @@ int btrfs_get_sb_bdev(struct file_system_type *fs_type,
return error;
bdev = fs_devices->lowest_bdev;
- /*
- * once the super is inserted into the list by sget, s_umount
- * will protect the lockfs code from trying to start a snapshot
- * while we are mounting
- */
- down(&bdev->bd_mount_sem);
- s = sget(fs_type, test_bdev_super, set_bdev_super, bdev);
- up(&bdev->bd_mount_sem);
+ btrfs_lock_volumes();
+ s = sget(fs_type, btrfs_test_super, set_anon_super, fs_devices);
+ btrfs_unlock_volumes();
if (IS_ERR(s))
goto error_s;
@@ -373,13 +356,11 @@ int btrfs_get_sb_bdev(struct file_system_type *fs_type,
goto error_bdev;
}
- close_bdev_excl(bdev);
} else {
char b[BDEVNAME_SIZE];
s->s_flags = flags;
strlcpy(s->s_id, bdevname(bdev, b), sizeof(s->s_id));
- sb_set_blocksize(s, block_size(bdev));
error = btrfs_fill_super(s, fs_devices, data,
flags & MS_SILENT ? 1 : 0);
if (error) {
@@ -458,7 +439,7 @@ static struct file_system_type btrfs_fs_type = {
.owner = THIS_MODULE,
.name = "btrfs",
.get_sb = btrfs_get_sb,
- .kill_sb = kill_block_super,
+ .kill_sb = kill_anon_super,
.fs_flags = FS_REQUIRES_DEV,
};
diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c
index 9826942..57746c1 100644
--- a/fs/btrfs/transaction.c
+++ b/fs/btrfs/transaction.c
@@ -738,9 +738,8 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
chunk_root->node->start);
btrfs_set_super_chunk_root_level(&root->fs_info->super_copy,
btrfs_header_level(chunk_root->node));
- write_extent_buffer(root->fs_info->sb_buffer,
- &root->fs_info->super_copy, 0,
- sizeof(root->fs_info->super_copy));
+ memcpy(&root->fs_info->super_for_commit, &root->fs_info->super_copy,
+ sizeof(root->fs_info->super_copy));
btrfs_copy_pinned(root, pinned_copy);
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index b381875..55da5f0 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -45,6 +45,16 @@ struct map_lookup {
static DEFINE_MUTEX(uuid_mutex);
static LIST_HEAD(fs_uuids);
+void btrfs_lock_volumes(void)
+{
+ mutex_lock(&uuid_mutex);
+}
+
+void btrfs_unlock_volumes(void)
+{
+ mutex_unlock(&uuid_mutex);
+}
+
int btrfs_cleanup_fs_uuids(void)
{
struct btrfs_fs_devices *fs_devices;
@@ -193,12 +203,14 @@ int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
ret = PTR_ERR(bdev);
goto fail;
}
+ 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;
+
}
mutex_unlock(&uuid_mutex);
return 0;
@@ -393,6 +405,9 @@ int btrfs_free_dev_extent(struct btrfs_trans_handle *trans,
struct btrfs_path *path;
struct btrfs_root *root = device->dev_root;
struct btrfs_key key;
+ struct btrfs_key found_key;
+ struct extent_buffer *leaf = NULL;
+ struct btrfs_dev_extent *extent = NULL;
path = btrfs_alloc_path();
if (!path)
@@ -403,8 +418,25 @@ int btrfs_free_dev_extent(struct btrfs_trans_handle *trans,
key.type = BTRFS_DEV_EXTENT_KEY;
ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
+ if (ret > 0) {
+ ret = btrfs_previous_item(root, path, key.objectid,
+ BTRFS_DEV_EXTENT_KEY);
+ BUG_ON(ret);
+ leaf = path->nodes[0];
+ btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
+ extent = btrfs_item_ptr(leaf, path->slots[0],
+ struct btrfs_dev_extent);
+ BUG_ON(found_key.offset > start || found_key.offset +
+ btrfs_dev_extent_length(leaf, extent) < start);
+ ret = 0;
+ } else if (ret == 0) {
+ leaf = path->nodes[0];
+ extent = btrfs_item_ptr(leaf, path->slots[0],
+ struct btrfs_dev_extent);
+ }
BUG_ON(ret);
+ device->bytes_used -= btrfs_dev_extent_length(leaf, extent);
ret = btrfs_del_item(trans, root, path);
BUG_ON(ret);
@@ -593,6 +625,170 @@ out:
return ret;
}
+static int btrfs_rm_dev_item(struct btrfs_root *root,
+ struct btrfs_device *device)
+{
+ int ret;
+ struct btrfs_path *path;
+ struct block_device *bdev = device->bdev;
+ struct btrfs_device *next_dev;
+ struct btrfs_key key;
+ u64 total_bytes;
+ struct btrfs_fs_devices *fs_devices;
+ struct btrfs_trans_handle *trans;
+
+ root = root->fs_info->chunk_root;
+
+ path = btrfs_alloc_path();
+ if (!path)
+ return -ENOMEM;
+
+ trans = btrfs_start_transaction(root, 1);
+ key.objectid = BTRFS_DEV_ITEMS_OBJECTID;
+ key.type = BTRFS_DEV_ITEM_KEY;
+ key.offset = device->devid;
+
+ ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
+ if (ret < 0)
+ goto out;
+
+ if (ret > 0) {
+ ret = -ENOENT;
+ goto out;
+ }
+
+ ret = btrfs_del_item(trans, root, path);
+ if (ret)
+ goto out;
+
+ /*
+ * at this point, the device is zero sized. We want to
+ * remove it from the devices list and zero out the old super
+ */
+ list_del_init(&device->dev_list);
+ list_del_init(&device->dev_alloc_list);
+ fs_devices = root->fs_info->fs_devices;
+
+ 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)
+ fs_devices->latest_bdev = next_dev->bdev;
+
+ total_bytes = btrfs_super_total_bytes(&root->fs_info->super_copy);
+ btrfs_set_super_total_bytes(&root->fs_info->super_copy,
+ total_bytes - device->total_bytes);
+
+ total_bytes = btrfs_super_num_devices(&root->fs_info->super_copy);
+ btrfs_set_super_num_devices(&root->fs_info->super_copy,
+ total_bytes - 1);
+out:
+ btrfs_free_path(path);
+ btrfs_commit_transaction(trans, root);
+ return ret;
+}
+
+int btrfs_rm_device(struct btrfs_root *root, char *device_path)
+{
+ struct btrfs_device *device;
+ struct block_device *bdev;
+ struct buffer_head *bh;
+ struct btrfs_super_block *disk_super;
+ u64 all_avail;
+ u64 devid;
+ int ret = 0;
+
+ mutex_lock(&root->fs_info->fs_mutex);
+ mutex_lock(&uuid_mutex);
+
+ all_avail = root->fs_info->avail_data_alloc_bits |
+ root->fs_info->avail_system_alloc_bits |
+ root->fs_info->avail_metadata_alloc_bits;
+
+ if ((all_avail & BTRFS_BLOCK_GROUP_RAID10) &&
+ root->fs_info->fs_devices->num_devices <= 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) {
+ 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;
+ }
+
+ 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);
+ if (ret)
+ goto error_brelse;
+
+
+ ret = btrfs_rm_dev_item(root->fs_info->chunk_root, device);
+ 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);
+
+ 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);
+
+ kfree(device->name);
+ kfree(device);
+ ret = 0;
+ goto out;
+
+error_brelse:
+ brelse(bh);
+error_close:
+ close_bdev_excl(bdev);
+out:
+ mutex_unlock(&uuid_mutex);
+ mutex_unlock(&root->fs_info->fs_mutex);
+ return ret;
+}
+
int btrfs_init_new_device(struct btrfs_root *root, char *device_path)
{
struct btrfs_trans_handle *trans;
@@ -831,13 +1027,17 @@ int btrfs_relocate_chunk(struct btrfs_root *root,
em = lookup_extent_mapping(em_tree, chunk_offset, 1);
spin_unlock(&em_tree->lock);
- BUG_ON(em->start > chunk_offset || em->start + em->len < chunk_offset);
+ BUG_ON(em->start > chunk_offset ||
+ em->start + em->len < chunk_offset);
map = (struct map_lookup *)em->bdev;
for (i = 0; i < map->num_stripes; i++) {
ret = btrfs_free_dev_extent(trans, map->stripes[i].dev,
map->stripes[i].physical);
BUG_ON(ret);
+
+ ret = btrfs_update_device(trans, map->stripes[i].dev);
+ BUG_ON(ret);
}
ret = btrfs_free_chunk(trans, root, chunk_tree, chunk_objectid,
chunk_offset);
@@ -847,11 +1047,8 @@ int btrfs_relocate_chunk(struct btrfs_root *root,
if (map->type & BTRFS_BLOCK_GROUP_SYSTEM) {
ret = btrfs_del_sys_chunk(root, chunk_objectid, chunk_offset);
BUG_ON(ret);
- goto out;
}
-
-
spin_lock(&em_tree->lock);
remove_extent_mapping(em_tree, em);
kfree(map);
@@ -861,7 +1058,6 @@ int btrfs_relocate_chunk(struct btrfs_root *root,
free_extent_map(em);
spin_unlock(&em_tree->lock);
-out:
/* once for us */
free_extent_map(em);
@@ -1449,7 +1645,7 @@ again:
return 0;
if (!em) {
- printk("unable to find logical %Lu\n", logical);
+ printk("unable to find logical %Lu len %Lu\n", logical, *length);
BUG();
}
@@ -1712,6 +1908,7 @@ static int read_one_chunk(struct btrfs_root *root, struct btrfs_key *key,
logical = key->offset;
length = btrfs_chunk_length(leaf, chunk);
+
spin_lock(&map_tree->map_tree.lock);
em = lookup_extent_mapping(&map_tree->map_tree, logical, 1);
spin_unlock(&map_tree->map_tree.lock);
@@ -1845,7 +2042,7 @@ int btrfs_read_super_device(struct btrfs_root *root, struct extent_buffer *buf)
int btrfs_read_sys_array(struct btrfs_root *root)
{
struct btrfs_super_block *super_copy = &root->fs_info->super_copy;
- struct extent_buffer *sb = root->fs_info->sb_buffer;
+ struct extent_buffer *sb;
struct btrfs_disk_key *disk_key;
struct btrfs_chunk *chunk;
u8 *ptr;
@@ -1857,6 +2054,12 @@ int btrfs_read_sys_array(struct btrfs_root *root)
u32 cur;
struct btrfs_key key;
+ sb = btrfs_find_create_tree_block(root, BTRFS_SUPER_INFO_OFFSET,
+ BTRFS_SUPER_INFO_SIZE);
+ if (!sb)
+ return -ENOMEM;
+ btrfs_set_buffer_uptodate(sb);
+ write_extent_buffer(sb, super_copy, 0, BTRFS_SUPER_INFO_SIZE);
array_size = btrfs_super_sys_array_size(super_copy);
ptr = super_copy->sys_chunk_array;
@@ -1867,8 +2070,7 @@ int btrfs_read_sys_array(struct btrfs_root *root)
disk_key = (struct btrfs_disk_key *)ptr;
btrfs_disk_key_to_cpu(&key, disk_key);
- len = sizeof(*disk_key);
- ptr += len;
+ len = sizeof(*disk_key); ptr += len;
sb_ptr += len;
cur += len;
@@ -1887,6 +2089,7 @@ int btrfs_read_sys_array(struct btrfs_root *root)
sb_ptr += len;
cur += len;
}
+ free_extent_buffer(sb);
return ret;
}
diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h
index a9663e9..0f94a69 100644
--- a/fs/btrfs/volumes.h
+++ b/fs/btrfs/volumes.h
@@ -125,6 +125,7 @@ int btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
int btrfs_add_device(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct btrfs_device *device);
+int btrfs_rm_device(struct btrfs_root *root, char *device_path);
int btrfs_cleanup_fs_uuids(void);
int btrfs_num_copies(struct btrfs_mapping_tree *map_tree, u64 logical, u64 len);
int btrfs_unplug_page(struct btrfs_mapping_tree *map_tree,
@@ -136,4 +137,6 @@ struct btrfs_device *btrfs_find_device(struct btrfs_root *root, u64 devid,
int btrfs_shrink_device(struct btrfs_device *device, u64 new_size);
int btrfs_init_new_device(struct btrfs_root *root, char *path);
int btrfs_balance(struct btrfs_root *dev_root);
+void btrfs_unlock_volumes(void);
+void btrfs_lock_volumes(void);
#endif
generated by cgit v1.1 at 2024-06-29 13:24:25 +0000