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Btrfs: Add support for multiple devices per filesystem 

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2008-03-24 15:01:56 -04:00
parent 7f93bf8d27
commit 0b86a832a1
13 changed files with 1570 additions and 387 deletions
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2
fs/btrfs/Makefile
View File

@ -6,7 +6,7 @@ btrfs-y := super.o ctree.o extent-tree.o print-tree.o root-tree.o dir-item.o \
hash.o file-item.o inode-item.o inode-map.o disk-io.o \
transaction.o bit-radix.o inode.o file.o tree-defrag.o \
extent_map.o sysfs.o struct-funcs.o xattr.o ordered-data.o \
extent_io.o
extent_io.o volumes.o
ifeq ($(CONFIG_FS_POSIX_ACL),y)
btrfs-y += acl.o

38
fs/btrfs/ctree.c
View File

@ -70,6 +70,14 @@ void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p)
memset(p, 0, sizeof(*p));
}
static void add_root_to_dirty_list(struct btrfs_root *root)
{
if (root->track_dirty && list_empty(&root->dirty_list)) {
list_add(&root->dirty_list,
&root->fs_info->dirty_cowonly_roots);
}
}
int btrfs_copy_root(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct extent_buffer *buf,
@ -196,6 +204,7 @@ int __btrfs_cow_block(struct btrfs_trans_handle *trans,
root_gen, 0, 0, 1);
}
free_extent_buffer(buf);
add_root_to_dirty_list(root);
} else {
root_gen = btrfs_header_generation(parent);
btrfs_set_node_blockptr(parent, parent_slot,
@ -241,7 +250,7 @@ int btrfs_cow_block(struct btrfs_trans_handle *trans,
return 0;
}
search_start = buf->start & ~((u64)BTRFS_BLOCK_GROUP_SIZE - 1);
search_start = buf->start & ~((u64)(1024 * 1024 * 1024) - 1);
ret = __btrfs_cow_block(trans, root, buf, parent,
parent_slot, cow_ret, search_start, 0);
return ret;
@ -724,6 +733,7 @@ static int balance_level(struct btrfs_trans_handle *trans,
BUG_ON(ret);
root->node = child;
add_root_to_dirty_list(root);
path->nodes[level] = NULL;
clean_tree_block(trans, root, mid);
wait_on_tree_block_writeback(root, mid);
@ -1369,6 +1379,7 @@ static int noinline insert_new_root(struct btrfs_trans_handle *trans,
/* the super has an extra ref to root->node */
free_extent_buffer(root->node);
root->node = c;
add_root_to_dirty_list(root);
extent_buffer_get(c);
path->nodes[level] = c;
path->slots[level] = 0;
@ -2777,3 +2788,28 @@ int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path)
}
return 0;
}
int btrfs_previous_item(struct btrfs_root *root,
struct btrfs_path *path, u64 min_objectid,
int type)
{
struct btrfs_key found_key;
struct extent_buffer *leaf;
int ret;
while(1) {
if (path->slots[0] == 0) {
ret = btrfs_prev_leaf(root, path);
if (ret != 0)
return ret;
} else {
path->slots[0]--;
}
leaf = path->nodes[0];
btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
if (found_key.type == type)
return 0;
}
return 1;
}

313
fs/btrfs/ctree.h
View File

@ -40,12 +40,44 @@ extern struct kmem_cache *btrfs_path_cachep;
#define BTRFS_MAGIC "_B4RfS_M"
#define BTRFS_MAX_LEVEL 8
/* holds pointers to all of the tree roots */
#define BTRFS_ROOT_TREE_OBJECTID 1ULL
/* stores information about which extents are in use, and reference counts */
#define BTRFS_EXTENT_TREE_OBJECTID 2ULL
/* one per subvolume, storing files and directories */
#define BTRFS_FS_TREE_OBJECTID 3ULL
/* directory objectid inside the root tree */
#define BTRFS_ROOT_TREE_DIR_OBJECTID 4ULL
/*
* chunk tree stores translations from logical -> physical block numbering
* the super block points to the chunk tree
*/
#define BTRFS_CHUNK_TREE_OBJECTID 5ULL
/*
* stores information about which areas of a given device are in use.
* one per device. The tree of tree roots points to the device tree
*/
#define BTRFS_DEV_TREE_OBJECTID 6ULL
/*
* All files have objectids higher than this.
*/
#define BTRFS_FIRST_FREE_OBJECTID 256ULL
/*
* the device items go into the chunk tree. The key is in the form
* [ 1 BTRFS_DEV_ITEM_KEY device_id ]
*/
#define BTRFS_DEV_ITEMS_OBJECTID 1ULL
/*
* we can actually store much bigger names, but lets not confuse the rest
* of linux
@ -95,6 +127,81 @@ struct btrfs_key {
u64 offset;
} __attribute__ ((__packed__));
struct btrfs_mapping_tree {
struct extent_map_tree map_tree;
};
#define BTRFS_DEV_UUID_SIZE 16
struct btrfs_dev_item {
/* the internal btrfs device id */
__le64 devid;
/* size of the device */
__le64 total_bytes;
/* bytes used */
__le64 bytes_used;
/* optimal io alignment for this device */
__le32 io_align;
/* optimal io width for this device */
__le32 io_width;
/* minimal io size for this device */
__le32 sector_size;
/* the kernel device number */
__le64 rdev;
/* type and info about this device */
__le64 type;
/* partition number, 0 for whole dev */
__le32 partition;
/* length of the name data at the end of the item */
__le16 name_len;
/* physical drive uuid (or lvm uuid) */
u8 uuid[BTRFS_DEV_UUID_SIZE];
/* name goes here */
} __attribute__ ((__packed__));
struct btrfs_stripe {
__le64 devid;
__le64 offset;
} __attribute__ ((__packed__));
struct btrfs_chunk {
__le64 owner;
__le64 stripe_len;
__le64 type;
/* optimal io alignment for this chunk */
__le32 io_align;
/* optimal io width for this chunk */
__le32 io_width;
/* minimal io size for this chunk */
__le32 sector_size;
/* 2^16 stripes is quite a lot, a second limit is the size of a single
* item in the btree
*/
__le16 num_stripes;
struct btrfs_stripe stripe;
/* additional stripes go here */
} __attribute__ ((__packed__));
static inline unsigned long btrfs_chunk_item_size(int num_stripes)
{
BUG_ON(num_stripes == 0);
return sizeof(struct btrfs_chunk) +
sizeof(struct btrfs_stripe) * (num_stripes - 1);
}
#define BTRFS_FSID_SIZE 16
/*
* every tree block (leaf or node) starts with this header.
@ -119,6 +226,13 @@ struct btrfs_header {
sizeof(struct btrfs_item) - \
sizeof(struct btrfs_file_extent_item))
/*
* this is a very generous portion of the super block, giving us
* room to translate 14 chunks with 3 stripes each.
*/
#define BTRFS_SYSTEM_CHUNK_ARRAY_SIZE 2048
/*
* the super block basically lists the main trees of the FS
* it currently lacks any block count etc etc
@ -131,6 +245,7 @@ struct btrfs_super_block {
__le64 magic;
__le64 generation;
__le64 root;
__le64 chunk_root;
__le64 total_bytes;
__le64 bytes_used;
__le64 root_dir_objectid;
@ -138,7 +253,10 @@ struct btrfs_super_block {
__le32 nodesize;
__le32 leafsize;
__le32 stripesize;
__le32 sys_chunk_array_size;
u8 root_level;
u8 chunk_root_level;
u8 sys_chunk_array[BTRFS_SYSTEM_CHUNK_ARRAY_SIZE];
} __attribute__ ((__packed__));
/*
@ -208,12 +326,22 @@ struct btrfs_extent_ref {
__le64 offset;
} __attribute__ ((__packed__));
/* dev extents record free space on individual devices. The owner
* field points back to the chunk allocation mapping tree that allocated
* the extent
*/
struct btrfs_dev_extent {
__le64 owner;
__le64 length;
} __attribute__ ((__packed__));
struct btrfs_inode_ref {
__le16 name_len;
/* name goes here */
} __attribute__ ((__packed__));
struct btrfs_inode_timespec {
struct btrfs_timespec {
__le64 sec;
__le32 nsec;
} __attribute__ ((__packed__));
@ -231,13 +359,13 @@ struct btrfs_inode_item {
__le32 uid;
__le32 gid;
__le32 mode;
__le32 rdev;
__le64 rdev;
__le16 flags;
__le16 compat_flags;
struct btrfs_inode_timespec atime;
struct btrfs_inode_timespec ctime;
struct btrfs_inode_timespec mtime;
struct btrfs_inode_timespec otime;
struct btrfs_timespec atime;
struct btrfs_timespec ctime;
struct btrfs_timespec mtime;
struct btrfs_timespec otime;
} __attribute__ ((__packed__));
struct btrfs_dir_item {
@ -290,29 +418,34 @@ struct btrfs_csum_item {
u8 csum;
} __attribute__ ((__packed__));
/* tag for the radix tree of block groups in ram */
#define BTRFS_BLOCK_GROUP_SIZE (256 * 1024 * 1024)
/* different types of block groups (and chunks) */
#define BTRFS_BLOCK_GROUP_DATA (1 << 0)
#define BTRFS_BLOCK_GROUP_SYSTEM (1 << 1)
#define BTRFS_BLOCK_GROUP_METADATA (1 << 2)
#define BTRFS_BLOCK_GROUP_DATA 1
#define BTRFS_BLOCK_GROUP_MIXED 2
struct btrfs_block_group_item {
__le64 used;
u8 flags;
__le64 chunk_tree;
__le64 chunk_objectid;
__le64 flags;
} __attribute__ ((__packed__));
struct btrfs_block_group_cache {
struct btrfs_key key;
struct btrfs_block_group_item item;
int data;
int cached;
u64 pinned;
u64 flags;
int cached;
};
struct btrfs_device;
struct btrfs_fs_info {
u8 fsid[BTRFS_FSID_SIZE];
struct btrfs_root *extent_root;
struct btrfs_root *tree_root;
struct btrfs_root *chunk_root;
struct btrfs_root *dev_root;
struct radix_tree_root fs_roots_radix;
struct extent_io_tree free_space_cache;
@ -321,6 +454,9 @@ struct btrfs_fs_info {
struct extent_io_tree pending_del;
struct extent_io_tree extent_ins;
/* logical->physical extent mapping */
struct btrfs_mapping_tree mapping_tree;
u64 generation;
u64 last_trans_committed;
unsigned long mount_opt;
@ -330,6 +466,7 @@ struct btrfs_fs_info {
struct btrfs_transaction *running_transaction;
struct btrfs_super_block super_copy;
struct extent_buffer *sb_buffer;
struct block_device *__bdev;
struct super_block *sb;
struct inode *btree_inode;
spinlock_t hash_lock;
@ -350,12 +487,17 @@ struct btrfs_fs_info {
unsigned long throttles;
u64 total_pinned;
struct list_head dirty_cowonly_roots;
struct list_head devices;
struct list_head *last_device;
spinlock_t delalloc_lock;
spinlock_t new_trans_lock;
u64 delalloc_bytes;
u64 last_alloc;
u64 last_data_alloc;
};
/*
* in ram representation of the tree. extent_root is used for all allocations
* and for the extent tree extent_root root.
@ -387,14 +529,19 @@ struct btrfs_root {
u64 highest_inode;
u64 last_inode_alloc;
int ref_cows;
int track_dirty;
struct btrfs_key defrag_progress;
int defrag_running;
int defrag_level;
char *name;
int in_sysfs;
/* the dirty list is only used by non-reference counted roots */
struct list_head dirty_list;
};
/*
* inode items have the data typically returned from stat and store other
* info about object characteristics. There is one for every file and dir in
* the FS
@ -439,6 +586,10 @@ struct btrfs_root {
*/
#define BTRFS_BLOCK_GROUP_ITEM_KEY 50
#define BTRFS_DEV_EXTENT_KEY 75
#define BTRFS_DEV_ITEM_KEY 76
#define BTRFS_CHUNK_ITEM_KEY 77
/*
* string items are for debugging. They just store a short string of
* data in the FS
@ -518,13 +669,104 @@ static inline void btrfs_set_##name(type *s, u##bits val) \
s->member = cpu_to_le##bits(val); \
}
BTRFS_SETGET_FUNCS(device_type, struct btrfs_dev_item, type, 64);
BTRFS_SETGET_FUNCS(device_total_bytes, struct btrfs_dev_item, total_bytes, 64);
BTRFS_SETGET_FUNCS(device_bytes_used, struct btrfs_dev_item, bytes_used, 64);
BTRFS_SETGET_FUNCS(device_io_align, struct btrfs_dev_item, io_align, 32);
BTRFS_SETGET_FUNCS(device_io_width, struct btrfs_dev_item, io_width, 32);
BTRFS_SETGET_FUNCS(device_sector_size, struct btrfs_dev_item, sector_size, 32);
BTRFS_SETGET_FUNCS(device_id, struct btrfs_dev_item, devid, 64);
BTRFS_SETGET_FUNCS(device_rdev, struct btrfs_dev_item, rdev, 64);
BTRFS_SETGET_FUNCS(device_partition, struct btrfs_dev_item, partition, 32);
BTRFS_SETGET_FUNCS(device_name_len, struct btrfs_dev_item, name_len, 16);
static inline char *btrfs_device_uuid(struct btrfs_dev_item *d)
{
return (char *)d + offsetof(struct btrfs_dev_item, uuid);
}
static inline char *btrfs_device_name(struct btrfs_dev_item *d)
{
return (char *)(d + 1);
}
BTRFS_SETGET_FUNCS(chunk_owner, struct btrfs_chunk, owner, 64);
BTRFS_SETGET_FUNCS(chunk_stripe_len, struct btrfs_chunk, stripe_len, 64);
BTRFS_SETGET_FUNCS(chunk_io_align, struct btrfs_chunk, io_align, 32);
BTRFS_SETGET_FUNCS(chunk_io_width, struct btrfs_chunk, io_width, 32);
BTRFS_SETGET_FUNCS(chunk_sector_size, struct btrfs_chunk, sector_size, 32);
BTRFS_SETGET_FUNCS(chunk_type, struct btrfs_chunk, type, 64);
BTRFS_SETGET_FUNCS(chunk_num_stripes, struct btrfs_chunk, num_stripes, 16);
BTRFS_SETGET_FUNCS(stripe_devid, struct btrfs_stripe, devid, 64);
BTRFS_SETGET_FUNCS(stripe_offset, struct btrfs_stripe, offset, 64);
BTRFS_SETGET_STACK_FUNCS(stack_chunk_owner, struct btrfs_chunk, owner, 64);
BTRFS_SETGET_STACK_FUNCS(stack_chunk_stripe_len, struct btrfs_chunk,
stripe_len, 64);
BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_align, struct btrfs_chunk,
io_align, 32);
BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_width, struct btrfs_chunk,
io_width, 32);
BTRFS_SETGET_STACK_FUNCS(stack_chunk_sector_size, struct btrfs_chunk,
sector_size, 32);
BTRFS_SETGET_STACK_FUNCS(stack_chunk_type, struct btrfs_chunk, type, 64);
BTRFS_SETGET_STACK_FUNCS(stack_chunk_num_stripes, struct btrfs_chunk,
num_stripes, 16);
BTRFS_SETGET_STACK_FUNCS(stack_stripe_devid, struct btrfs_stripe, devid, 64);
BTRFS_SETGET_STACK_FUNCS(stack_stripe_offset, struct btrfs_stripe, offset, 64);
static inline struct btrfs_stripe *btrfs_stripe_nr(struct btrfs_chunk *c,
int nr)
{
unsigned long offset = (unsigned long)c;
offset += offsetof(struct btrfs_chunk, stripe);
offset += nr * sizeof(struct btrfs_stripe);
return (struct btrfs_stripe *)offset;
}
static inline u64 btrfs_stripe_offset_nr(struct extent_buffer *eb,
struct btrfs_chunk *c, int nr)
{
return btrfs_stripe_offset(eb, btrfs_stripe_nr(c, nr));
}
static inline void btrfs_set_stripe_offset_nr(struct extent_buffer *eb,
struct btrfs_chunk *c, int nr,
u64 val)
{
btrfs_set_stripe_offset(eb, btrfs_stripe_nr(c, nr), val);
}
static inline u64 btrfs_stripe_devid_nr(struct extent_buffer *eb,
struct btrfs_chunk *c, int nr)
{
return btrfs_stripe_devid(eb, btrfs_stripe_nr(c, nr));
}
static inline void btrfs_set_stripe_devid_nr(struct extent_buffer *eb,
struct btrfs_chunk *c, int nr,
u64 val)
{
btrfs_set_stripe_devid(eb, btrfs_stripe_nr(c, nr), val);
}
/* struct btrfs_block_group_item */
BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item,
used, 64);
BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item,
used, 64);
BTRFS_SETGET_FUNCS(disk_block_group_flags, struct btrfs_block_group_item,
flags, 8);
BTRFS_SETGET_STACK_FUNCS(block_group_chunk_tree, struct btrfs_block_group_item,
chunk_tree, 64);
BTRFS_SETGET_FUNCS(disk_block_group_chunk_tree, struct btrfs_block_group_item,
chunk_tree, 64);
BTRFS_SETGET_STACK_FUNCS(block_group_chunk_objectid,
struct btrfs_block_group_item, chunk_objectid, 64);
BTRFS_SETGET_FUNCS(disk_block_group_chunk_objecitd,
struct btrfs_block_group_item, chunk_objectid, 64);
BTRFS_SETGET_FUNCS(disk_block_group_flags,
struct btrfs_block_group_item, flags, 64);
BTRFS_SETGET_STACK_FUNCS(block_group_flags,
struct btrfs_block_group_item, flags, 64);
/* struct btrfs_inode_ref */
BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
@ -538,49 +780,53 @@ BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 32);
BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 64);
BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 16);
BTRFS_SETGET_FUNCS(inode_compat_flags, struct btrfs_inode_item,
compat_flags, 16);
static inline struct btrfs_inode_timespec *
static inline struct btrfs_timespec *
btrfs_inode_atime(struct btrfs_inode_item *inode_item)
{
unsigned long ptr = (unsigned long)inode_item;
ptr += offsetof(struct btrfs_inode_item, atime);
return (struct btrfs_inode_timespec *)ptr;
return (struct btrfs_timespec *)ptr;
}
static inline struct btrfs_inode_timespec *
static inline struct btrfs_timespec *
btrfs_inode_mtime(struct btrfs_inode_item *inode_item)
{
unsigned long ptr = (unsigned long)inode_item;
ptr += offsetof(struct btrfs_inode_item, mtime);
return (struct btrfs_inode_timespec *)ptr;
return (struct btrfs_timespec *)ptr;
}
static inline struct btrfs_inode_timespec *
static inline struct btrfs_timespec *
btrfs_inode_ctime(struct btrfs_inode_item *inode_item)
{
unsigned long ptr = (unsigned long)inode_item;
ptr += offsetof(struct btrfs_inode_item, ctime);
return (struct btrfs_inode_timespec *)ptr;
return (struct btrfs_timespec *)ptr;
}
static inline struct btrfs_inode_timespec *
static inline struct btrfs_timespec *
btrfs_inode_otime(struct btrfs_inode_item *inode_item)
{
unsigned long ptr = (unsigned long)inode_item;
ptr += offsetof(struct btrfs_inode_item, otime);
return (struct btrfs_inode_timespec *)ptr;
return (struct btrfs_timespec *)ptr;
}
BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_inode_timespec, sec, 64);
BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_inode_timespec, nsec, 32);
BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_timespec, sec, 64);
BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_timespec, nsec, 32);
/* struct btrfs_extent_item */
BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 32);
/* struct btrfs_dev_extent */
BTRFS_SETGET_FUNCS(dev_extent_owner, struct btrfs_dev_extent, owner, 64);
BTRFS_SETGET_FUNCS(dev_extent_length, struct btrfs_dev_extent, length, 64);
/* struct btrfs_extent_ref */
BTRFS_SETGET_FUNCS(ref_root, struct btrfs_extent_ref, root, 64);
BTRFS_SETGET_FUNCS(ref_generation, struct btrfs_extent_ref, generation, 64);
@ -846,8 +1092,14 @@ BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 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);
BTRFS_SETGET_STACK_FUNCS(super_sys_array_size,
struct btrfs_super_block, sys_chunk_array_size, 32);
BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block,
root_level, 8);
BTRFS_SETGET_STACK_FUNCS(super_chunk_root, struct btrfs_super_block,
chunk_root, 64);
BTRFS_SETGET_STACK_FUNCS(super_chunk_root_level, struct btrfs_super_block,
chunk_root_level, 64);
BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block,
total_bytes, 64);
BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block,
@ -1009,7 +1261,14 @@ int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
struct btrfs_root *root);
int btrfs_free_block_groups(struct btrfs_fs_info *info);
int btrfs_read_block_groups(struct btrfs_root *root);
int btrfs_make_block_group(struct btrfs_trans_handle *trans,
struct btrfs_root *root, u64 bytes_used,
u64 type, u64 chunk_tree, u64 chunk_objectid,
u64 size);
/* ctree.c */
int btrfs_previous_item(struct btrfs_root *root,
struct btrfs_path *path, u64 min_objectid,
int type);
int btrfs_cow_block(struct btrfs_trans_handle *trans,
struct btrfs_root *root, struct extent_buffer *buf,
struct extent_buffer *parent, int parent_slot,

97
fs/btrfs/disk-io.c
View File

@ -28,6 +28,7 @@
#include "disk-io.h"
#include "transaction.h"
#include "btrfs_inode.h"
#include "volumes.h"
#include "print-tree.h"
#if 0
@ -234,6 +235,19 @@ static int btree_writepage_io_hook(struct page *page, u64 start, u64 end)
return 0;
}
static int btree_submit_bio_hook(struct inode *inode, int rw, struct bio *bio)
{
struct btrfs_root *root = BTRFS_I(inode)->root;
u64 offset;
offset = bio->bi_sector << 9;
if (offset == BTRFS_SUPER_INFO_OFFSET) {
bio->bi_bdev = root->fs_info->sb->s_bdev;
submit_bio(rw, bio);
return 0;
}
return btrfs_map_bio(BTRFS_I(inode)->root, rw, bio);
}
static int btree_writepage(struct page *page, struct writeback_control *wbc)
{
struct extent_io_tree *tree;
@ -345,6 +359,23 @@ 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->devices;
while(!list_empty(list)) {
next = list->next;
list_del(next);
device = list_entry(next, struct btrfs_device, dev_list);
kfree(device->name);
kfree(device);
}
return 0;
}
struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr,
u32 blocksize)
{
@ -420,6 +451,8 @@ static int __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize,
root->leafsize = leafsize;
root->stripesize = stripesize;
root->ref_cows = 0;
root->track_dirty = 0;
root->fs_info = fs_info;
root->objectid = objectid;
root->last_trans = 0;
@ -427,6 +460,8 @@ static int __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize,
root->last_inode_alloc = 0;
root->name = NULL;
root->in_sysfs = 0;
INIT_LIST_HEAD(&root->dirty_list);
memset(&root->root_key, 0, sizeof(root->root_key));
memset(&root->root_item, 0, sizeof(root->root_item));
memset(&root->defrag_progress, 0, sizeof(root->defrag_progress));
@ -634,6 +669,10 @@ struct btrfs_root *open_ctree(struct super_block *sb)
GFP_NOFS);
struct btrfs_fs_info *fs_info = kmalloc(sizeof(*fs_info),
GFP_NOFS);
struct btrfs_root *chunk_root = kmalloc(sizeof(struct btrfs_root),
GFP_NOFS);
struct btrfs_root *dev_root = kmalloc(sizeof(struct btrfs_root),
GFP_NOFS);
int ret;
int err = -EIO;
struct btrfs_super_block *disk_super;
@ -657,6 +696,12 @@ struct btrfs_root *open_ctree(struct super_block *sb)
fs_info->last_trans_committed = 0;
fs_info->tree_root = tree_root;
fs_info->extent_root = extent_root;
fs_info->chunk_root = chunk_root;
fs_info->dev_root = dev_root;
INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots);
INIT_LIST_HEAD(&fs_info->devices);
btrfs_mapping_init(&fs_info->mapping_tree);
fs_info->last_device = &fs_info->devices;
fs_info->sb = sb;
fs_info->throttles = 0;
fs_info->mount_opt = 0;
@ -714,12 +759,12 @@ struct btrfs_root *open_ctree(struct super_block *sb)
goto fail_iput;
}
#endif
__setup_root(512, 512, 512, 512, tree_root,
__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,
512);
4096);
if (!fs_info->sb_buffer)
goto fail_iput;
@ -730,6 +775,7 @@ struct btrfs_root *open_ctree(struct super_block *sb)
read_extent_buffer(fs_info->sb_buffer, fs_info->fsid,
(unsigned long)btrfs_super_fsid(fs_info->sb_buffer),
BTRFS_FSID_SIZE);
disk_super = &fs_info->super_copy;
if (!btrfs_super_root(disk_super))
goto fail_sb_buffer;
@ -753,23 +799,47 @@ struct btrfs_root *open_ctree(struct super_block *sb)
goto fail_sb_buffer;
}
mutex_lock(&fs_info->fs_mutex);
ret = btrfs_read_sys_array(tree_root);
BUG_ON(ret);
blocksize = btrfs_level_size(tree_root,
btrfs_super_chunk_root_level(disk_super));
__setup_root(nodesize, leafsize, sectorsize, stripesize,
chunk_root, fs_info, BTRFS_CHUNK_TREE_OBJECTID);
chunk_root->node = read_tree_block(chunk_root,
btrfs_super_chunk_root(disk_super),
blocksize);
BUG_ON(!chunk_root->node);
ret = btrfs_read_chunk_tree(chunk_root);
BUG_ON(ret);
blocksize = btrfs_level_size(tree_root,
btrfs_super_root_level(disk_super));
tree_root->node = read_tree_block(tree_root,
btrfs_super_root(disk_super),
blocksize);
if (!tree_root->node)
goto fail_sb_buffer;
mutex_lock(&fs_info->fs_mutex);
ret = find_and_setup_root(tree_root, fs_info,
BTRFS_EXTENT_TREE_OBJECTID, extent_root);
if (ret) {
mutex_unlock(&fs_info->fs_mutex);
if (ret)
goto fail_tree_root;
}
extent_root->track_dirty = 1;
ret = find_and_setup_root(tree_root, fs_info,
BTRFS_DEV_TREE_OBJECTID, dev_root);
dev_root->track_dirty = 1;
if (ret)
goto fail_extent_root;
btrfs_read_block_groups(extent_root);
@ -777,7 +847,10 @@ struct btrfs_root *open_ctree(struct super_block *sb)
mutex_unlock(&fs_info->fs_mutex);
return tree_root;
fail_extent_root:
free_extent_buffer(extent_root->node);
fail_tree_root:
mutex_unlock(&fs_info->fs_mutex);
free_extent_buffer(tree_root->node);
fail_sb_buffer:
free_extent_buffer(fs_info->sb_buffer);
@ -874,6 +947,12 @@ int close_ctree(struct btrfs_root *root)
if (fs_info->tree_root->node)
free_extent_buffer(fs_info->tree_root->node);
if (root->fs_info->chunk_root->node);
free_extent_buffer(root->fs_info->chunk_root->node);
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);
@ -901,8 +980,13 @@ int close_ctree(struct btrfs_root *root)
kfree(hasher);
}
#endif
close_all_devices(fs_info);
btrfs_mapping_tree_free(&fs_info->mapping_tree);
kfree(fs_info->extent_root);
kfree(fs_info->tree_root);
kfree(fs_info->chunk_root);
kfree(fs_info->dev_root);
return 0;
}
@ -1016,4 +1100,5 @@ int btrfs_read_buffer(struct extent_buffer *buf)
static struct extent_io_ops btree_extent_io_ops = {
.writepage_io_hook = btree_writepage_io_hook,
.submit_bio_hook = btree_submit_bio_hook,
};

2
fs/btrfs/disk-io.h
View File

@ -20,6 +20,7 @@
#define __DISKIO__
#define BTRFS_SUPER_INFO_OFFSET (16 * 1024)
struct btrfs_device;
struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr,
u32 blocksize);
@ -65,4 +66,5 @@ int btrfs_read_buffer(struct extent_buffer *buf);
u32 btrfs_csum_data(struct btrfs_root *root, char *data, u32 seed, size_t len);
void btrfs_csum_final(u32 crc, char *result);
void btrfs_throttle(struct btrfs_root *root);
int btrfs_open_device(struct btrfs_device *dev);
#endif

439
fs/btrfs/extent-tree.c
View File

@ -24,37 +24,19 @@
#include "disk-io.h"
#include "print-tree.h"
#include "transaction.h"
#include "volumes.h"
#define BLOCK_GROUP_DATA EXTENT_WRITEBACK
#define BLOCK_GROUP_DATA EXTENT_WRITEBACK
#define BLOCK_GROUP_METADATA EXTENT_UPTODATE
#define BLOCK_GROUP_SYSTEM EXTENT_NEW
#define BLOCK_GROUP_DIRTY EXTENT_DIRTY
static int finish_current_insert(struct btrfs_trans_handle *trans, struct
btrfs_root *extent_root);
static int del_pending_extents(struct btrfs_trans_handle *trans, struct
btrfs_root *extent_root);
static int find_previous_extent(struct btrfs_root *root,
struct btrfs_path *path)
{
struct btrfs_key found_key;
struct extent_buffer *leaf;
int ret;
while(1) {
if (path->slots[0] == 0) {
ret = btrfs_prev_leaf(root, path);
if (ret != 0)
return ret;
} else {
path->slots[0]--;
}
leaf = path->nodes[0];
btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
if (found_key.type == BTRFS_EXTENT_ITEM_KEY)
return 0;
}
return 1;
}
static int cache_block_group(struct btrfs_root *root,
struct btrfs_block_group_cache *block_group)
@ -91,7 +73,7 @@ static int cache_block_group(struct btrfs_root *root,
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
if (ret < 0)
return ret;
ret = find_previous_extent(root, path);
ret = btrfs_previous_item(root, path, 0, BTRFS_EXTENT_ITEM_KEY);
if (ret < 0)
return ret;
if (ret == 0) {
@ -168,7 +150,8 @@ struct btrfs_block_group_cache *btrfs_lookup_block_group(struct
block_group_cache = &info->block_group_cache;
ret = find_first_extent_bit(block_group_cache,
bytenr, &start, &end,
BLOCK_GROUP_DATA | BLOCK_GROUP_METADATA);
BLOCK_GROUP_DATA | BLOCK_GROUP_METADATA |
BLOCK_GROUP_SYSTEM);
if (ret) {
return NULL;
}
@ -182,23 +165,38 @@ struct btrfs_block_group_cache *btrfs_lookup_block_group(struct
return block_group;
return NULL;
}
static u64 noinline find_search_start(struct btrfs_root *root,
static int block_group_bits(struct btrfs_block_group_cache *cache, u64 bits)
{
if ((bits & BLOCK_GROUP_DATA) &&
(cache->flags & BTRFS_BLOCK_GROUP_DATA))
return 1;
if ((bits & BLOCK_GROUP_METADATA) &&
(cache->flags & BTRFS_BLOCK_GROUP_METADATA))
return 1;
if ((bits & BLOCK_GROUP_SYSTEM) &&
(cache->flags & BTRFS_BLOCK_GROUP_SYSTEM))
return 1;
return 0;
}
static int noinline find_search_start(struct btrfs_root *root,
struct btrfs_block_group_cache **cache_ret,
u64 search_start, int num, int data)
u64 *start_ret, int num, int data)
{
int ret;
struct btrfs_block_group_cache *cache = *cache_ret;
struct extent_io_tree *free_space_cache;
struct extent_state *state;
u64 last;
u64 start = 0;
u64 end = 0;
u64 cache_miss = 0;
u64 total_fs_bytes;
u64 search_start = *start_ret;
int wrapped = 0;
if (!cache) {
if (!cache)
goto out;
}
total_fs_bytes = btrfs_super_total_bytes(&root->fs_info->super_copy);
free_space_cache = &root->fs_info->free_space_cache;
@ -208,6 +206,9 @@ static u64 noinline find_search_start(struct btrfs_root *root,
goto out;
last = max(search_start, cache->key.objectid);
if (!block_group_bits(cache, data)) {
goto new_group;
}
while(1) {
ret = find_first_extent_bit(&root->fs_info->free_space_cache,
@ -225,22 +226,20 @@ static u64 noinline find_search_start(struct btrfs_root *root,
cache_miss = start;
continue;
}
if (data != BTRFS_BLOCK_GROUP_MIXED &&
start + num > cache->key.objectid + cache->key.offset)
if (start + num > cache->key.objectid + cache->key.offset)
goto new_group;
if (start + num > total_fs_bytes)
goto new_group;
return start;
*start_ret = start;
return 0;
}
out:
cache = btrfs_lookup_block_group(root->fs_info, search_start);
if (!cache) {
printk("Unable to find block group for %Lu\n",
search_start);
printk("Unable to find block group for %Lu\n", search_start);
WARN_ON(1);
return search_start;
}
return search_start;
return -ENOSPC;
new_group:
last = cache->key.objectid + cache->key.offset;
@ -251,7 +250,6 @@ static u64 noinline find_search_start(struct btrfs_root *root,
if (!wrapped) {
wrapped = 1;
last = search_start;
data = BTRFS_BLOCK_GROUP_MIXED;
goto wrapped;
}
goto out;
@ -299,7 +297,6 @@ struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root,
int ret;
int full_search = 0;
int factor = 8;
int data_swap = 0;
block_group_cache = &info->block_group_cache;
total_fs_bytes = btrfs_super_total_bytes(&root->fs_info->super_copy);
@ -307,19 +304,12 @@ struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root,
if (!owner)
factor = 8;
if (data == BTRFS_BLOCK_GROUP_MIXED) {
bit = BLOCK_GROUP_DATA | BLOCK_GROUP_METADATA;
factor = 10;
} else if (data)
bit = BLOCK_GROUP_DATA;
else
bit = BLOCK_GROUP_METADATA;
bit = data;
if (search_start && search_start < total_fs_bytes) {
struct btrfs_block_group_cache *shint;
shint = btrfs_lookup_block_group(info, search_start);
if (shint && (shint->data == data ||
shint->data == BTRFS_BLOCK_GROUP_MIXED)) {
if (shint && block_group_bits(shint, data)) {
used = btrfs_block_group_used(&shint->item);
if (used + shint->pinned <
div_factor(shint->key.offset, factor)) {
@ -327,8 +317,8 @@ struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root,
}
}
}
if (hint && hint->key.objectid < total_fs_bytes &&
(hint->data == data || hint->data == BTRFS_BLOCK_GROUP_MIXED)) {
if (hint && block_group_bits(hint, data) &&
hint->key.objectid < total_fs_bytes) {
used = btrfs_block_group_used(&hint->item);
if (used + hint->pinned <
div_factor(hint->key.offset, factor)) {
@ -379,12 +369,6 @@ struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root,
full_search = 1;
goto again;
}
if (!data_swap) {
data_swap = 1;
bit = BLOCK_GROUP_DATA | BLOCK_GROUP_METADATA;
last = search_start;
goto again;
}
found:
return found_group;
}
@ -1002,7 +986,7 @@ int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
static int update_block_group(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
u64 bytenr, u64 num_bytes, int alloc,
int mark_free, int data)
int mark_free)
{
struct btrfs_block_group_cache *cache;
struct btrfs_fs_info *info = root->fs_info;
@ -1027,41 +1011,6 @@ static int update_block_group(struct btrfs_trans_handle *trans,
old_val = btrfs_block_group_used(&cache->item);
num_bytes = min(total, cache->key.offset - byte_in_group);
if (alloc) {
if (cache->data != data &&
old_val < (cache->key.offset >> 1)) {
int bit_to_clear;
int bit_to_set;
cache->data = data;
if (data) {
bit_to_clear = BLOCK_GROUP_METADATA;
bit_to_set = BLOCK_GROUP_DATA;
cache->item.flags &=
~BTRFS_BLOCK_GROUP_MIXED;
cache->item.flags |=
BTRFS_BLOCK_GROUP_DATA;
} else {
bit_to_clear = BLOCK_GROUP_DATA;
bit_to_set = BLOCK_GROUP_METADATA;
cache->item.flags &=
~BTRFS_BLOCK_GROUP_MIXED;
cache->item.flags &=
~BTRFS_BLOCK_GROUP_DATA;
}
clear_extent_bits(&info->block_group_cache,
start, end, bit_to_clear,
GFP_NOFS);
set_extent_bits(&info->block_group_cache,
start, end, bit_to_set,
GFP_NOFS);
} else if (cache->data != data &&
cache->data != BTRFS_BLOCK_GROUP_MIXED) {
cache->data = BTRFS_BLOCK_GROUP_MIXED;
set_extent_bits(&info->block_group_cache,
start, end,
BLOCK_GROUP_DATA |
BLOCK_GROUP_METADATA,
GFP_NOFS);
}
old_val += num_bytes;
} else {
old_val -= num_bytes;
@ -1357,7 +1306,7 @@ static int __free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
return ret;
}
ret = update_block_group(trans, root, bytenr, num_bytes, 0,
mark_free, 0);
mark_free);
BUG_ON(ret);
}
btrfs_free_path(path);
@ -1450,38 +1399,21 @@ static int noinline find_free_extent(struct btrfs_trans_handle *trans,
u64 exclude_start, u64 exclude_nr,
int data)
{
struct btrfs_path *path;
struct btrfs_key key;
u64 hole_size = 0;
u64 aligned;
int ret;
int slot = 0;
u64 last_byte = 0;
u64 *last_ptr = NULL;
u64 orig_search_start = search_start;
int start_found;
struct extent_buffer *l;
struct btrfs_root * root = orig_root->fs_info->extent_root;
struct btrfs_fs_info *info = root->fs_info;
u64 total_needed = num_bytes;
int level;
struct btrfs_block_group_cache *block_group;
int full_scan = 0;
int wrapped = 0;
int empty_cluster;
u64 cached_start;
WARN_ON(num_bytes < root->sectorsize);
btrfs_set_key_type(ins, BTRFS_EXTENT_ITEM_KEY);
level = btrfs_header_level(root->node);
if (num_bytes >= 32 * 1024 * 1024 && hint_byte) {
data = BTRFS_BLOCK_GROUP_MIXED;
}
if (search_end == (u64)-1)
search_end = btrfs_super_total_bytes(&info->super_copy);
if (hint_byte) {
block_group = btrfs_lookup_block_group(info, hint_byte);
if (!block_group)
@ -1495,7 +1427,7 @@ static int noinline find_free_extent(struct btrfs_trans_handle *trans,
}
total_needed += empty_size;
path = btrfs_alloc_path();
check_failed:
if (!block_group) {
block_group = btrfs_lookup_block_group(info, search_start);
@ -1503,135 +1435,49 @@ static int noinline find_free_extent(struct btrfs_trans_handle *trans,
block_group = btrfs_lookup_block_group(info,
orig_search_start);
}
search_start = find_search_start(root, &block_group, search_start,
total_needed, data);
ret = find_search_start(root, &block_group, &search_start,
total_needed, data);
if (ret)
goto error;
search_start = stripe_align(root, search_start);
cached_start = search_start;
btrfs_init_path(path);
ins->objectid = search_start;
ins->offset = 0;
start_found = 0;
path->reada = 2;
ret = btrfs_search_slot(trans, root, ins, path, 0, 0);
if (ret < 0)
goto error;
ret = find_previous_extent(root, path);
if (ret < 0)
goto error;
l = path->nodes[0];
btrfs_item_key_to_cpu(l, &key, path->slots[0]);
while (1) {
l = path->nodes[0];
slot = path->slots[0];
if (slot >= btrfs_header_nritems(l)) {
ret = btrfs_next_leaf(root, path);
if (ret == 0)
continue;
if (ret < 0)
goto error;
search_start = max(search_start,
block_group->key.objectid);
if (!start_found) {
aligned = stripe_align(root, search_start);
ins->objectid = aligned;
if (aligned >= search_end) {
ret = -ENOSPC;
goto error;
}
ins->offset = search_end - aligned;
start_found = 1;
goto check_pending;
}
ins->objectid = stripe_align(root,
last_byte > search_start ?
last_byte : search_start);
if (search_end <= ins->objectid) {
ret = -ENOSPC;
goto error;
}
ins->offset = search_end - ins->objectid;
BUG_ON(ins->objectid >= search_end);
goto check_pending;
}
btrfs_item_key_to_cpu(l, &key, slot);
if (key.objectid >= search_start && key.objectid > last_byte &&
start_found) {
if (last_byte < search_start)
last_byte = search_start;
aligned = stripe_align(root, last_byte);
hole_size = key.objectid - aligned;
if (key.objectid > aligned && hole_size >= num_bytes) {
ins->objectid = aligned;
ins->offset = hole_size;
goto check_pending;
}
}
if (btrfs_key_type(&key) != BTRFS_EXTENT_ITEM_KEY) {
if (!start_found && btrfs_key_type(&key) ==
BTRFS_BLOCK_GROUP_ITEM_KEY) {
last_byte = key.objectid;
start_found = 1;
}
goto next;
}
start_found = 1;
last_byte = key.objectid + key.offset;
if (!full_scan && data != BTRFS_BLOCK_GROUP_MIXED &&
last_byte >= block_group->key.objectid +
block_group->key.offset) {
btrfs_release_path(root, path);
search_start = block_group->key.objectid +
block_group->key.offset;
goto new_group;
}
next:
path->slots[0]++;
cond_resched();
}
check_pending:
/* we have to make sure we didn't find an extent that has already
* been allocated by the map tree or the original allocation
*/
btrfs_release_path(root, path);
BUG_ON(ins->objectid < search_start);
ins->offset = num_bytes;
if (ins->objectid + num_bytes >= search_end)
goto enospc;
if (!full_scan && data != BTRFS_BLOCK_GROUP_MIXED &&
ins->objectid + num_bytes > block_group->
key.objectid + block_group->key.offset) {
if (ins->objectid + num_bytes >
block_group->key.objectid + block_group->key.offset) {
search_start = block_group->key.objectid +
block_group->key.offset;
goto new_group;
}
if (test_range_bit(&info->extent_ins, ins->objectid,
ins->objectid + num_bytes -1, EXTENT_LOCKED, 0)) {
search_start = ins->objectid + num_bytes;
goto new_group;
}
if (test_range_bit(&info->pinned_extents, ins->objectid,
ins->objectid + num_bytes -1, EXTENT_DIRTY, 0)) {
search_start = ins->objectid + num_bytes;
goto new_group;
}
if (exclude_nr > 0 && (ins->objectid + num_bytes > exclude_start &&
ins->objectid < exclude_start + exclude_nr)) {
search_start = exclude_start + exclude_nr;
goto new_group;
}
if (!data) {
if (!(data & BLOCK_GROUP_DATA)) {
block_group = btrfs_lookup_block_group(info, ins->objectid);
if (block_group)
trans->block_group = block_group;
}
ins->offset = num_bytes;
btrfs_free_path(path);
return 0;
new_group:
@ -1646,7 +1492,6 @@ static int noinline find_free_extent(struct btrfs_trans_handle *trans,
if (!full_scan)
total_needed -= empty_size;
full_scan = 1;
data = BTRFS_BLOCK_GROUP_MIXED;
} else
wrapped = 1;
}
@ -1657,8 +1502,6 @@ static int noinline find_free_extent(struct btrfs_trans_handle *trans,
goto check_failed;
error:
btrfs_release_path(root, path);
btrfs_free_path(path);
return ret;
}
/*
@ -1689,6 +1532,13 @@ int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
struct btrfs_path *path;
struct btrfs_key keys[2];
if (data)
data = BLOCK_GROUP_DATA;
else if (root == root->fs_info->chunk_root)
data = BLOCK_GROUP_SYSTEM;
else
data = BLOCK_GROUP_METADATA;
new_hint = max(hint_byte, root->fs_info->alloc_start);
if (new_hint < btrfs_super_total_bytes(&info->super_copy))
hint_byte = new_hint;
@ -1718,7 +1568,6 @@ int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
set_extent_bits(&root->fs_info->extent_ins, ins->objectid,
ins->objectid + ins->offset - 1,
EXTENT_LOCKED, GFP_NOFS);
WARN_ON(data == 1);
goto update_block;
}
@ -1768,8 +1617,7 @@ int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
}
update_block:
ret = update_block_group(trans, root, ins->objectid, ins->offset, 1, 0,
data);
ret = update_block_group(trans, root, ins->objectid, ins->offset, 1, 0);
if (ret) {
printk("update block group failed for %Lu %Lu\n",
ins->objectid, ins->offset);
@ -2457,7 +2305,7 @@ int btrfs_shrink_extent_tree(struct btrfs_root *root, u64 new_size)
if (ret < 0)
goto out;
ret = find_previous_extent(root, path);
ret = btrfs_previous_item(root, path, 0, BTRFS_EXTENT_ITEM_KEY);
if (ret < 0)
goto out;
if (ret == 0) {
@ -2604,95 +2452,48 @@ int btrfs_shrink_extent_tree(struct btrfs_root *root, u64 new_size)
int btrfs_grow_extent_tree(struct btrfs_trans_handle *trans,
struct btrfs_root *root, u64 new_size)
{
struct btrfs_path *path;
u64 nr = 0;
u64 cur_byte;
u64 old_size;
unsigned long rem;
struct btrfs_block_group_cache *cache;
struct btrfs_block_group_item *item;
struct btrfs_fs_info *info = root->fs_info;
struct extent_io_tree *block_group_cache;
struct btrfs_key key;
struct extent_buffer *leaf;
int ret;
int bit;
old_size = btrfs_super_total_bytes(&info->super_copy);
block_group_cache = &info->block_group_cache;
root = info->extent_root;
cache = btrfs_lookup_block_group(root->fs_info, old_size - 1);
cur_byte = cache->key.objectid + cache->key.offset;
if (cur_byte >= new_size)
goto set_size;
key.offset = BTRFS_BLOCK_GROUP_SIZE;
btrfs_set_key_type(&key, BTRFS_BLOCK_GROUP_ITEM_KEY);
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
while(cur_byte < new_size) {
key.objectid = cur_byte;
ret = btrfs_insert_empty_item(trans, root, path, &key,
sizeof(struct btrfs_block_group_item));
BUG_ON(ret);
leaf = path->nodes[0];
item = btrfs_item_ptr(leaf, path->slots[0],
struct btrfs_block_group_item);
btrfs_set_disk_block_group_used(leaf, item, 0);
div_long_long_rem(nr, 3, &rem);
if (rem) {
btrfs_set_disk_block_group_flags(leaf, item,
BTRFS_BLOCK_GROUP_DATA);
} else {
btrfs_set_disk_block_group_flags(leaf, item, 0);
}
nr++;
cache = kmalloc(sizeof(*cache), GFP_NOFS);
BUG_ON(!cache);
read_extent_buffer(leaf, &cache->item, (unsigned long)item,
sizeof(cache->item));
memcpy(&cache->key, &key, sizeof(key));
cache->cached = 0;
cache->pinned = 0;
cur_byte = key.objectid + key.offset;
btrfs_release_path(root, path);
if (cache->item.flags & BTRFS_BLOCK_GROUP_DATA) {
bit = BLOCK_GROUP_DATA;
cache->data = BTRFS_BLOCK_GROUP_DATA;
} else {
bit = BLOCK_GROUP_METADATA;
cache->data = 0;
}
/* use EXTENT_LOCKED to prevent merging */
set_extent_bits(block_group_cache, key.objectid,
key.objectid + key.offset - 1,
bit | EXTENT_LOCKED, GFP_NOFS);
set_state_private(block_group_cache, key.objectid,
(unsigned long)cache);
}
btrfs_free_path(path);
set_size:
btrfs_set_super_total_bytes(&info->super_copy, new_size);
btrfs_set_super_total_bytes(&root->fs_info->super_copy, new_size);
return 0;
}
int find_first_block_group(struct btrfs_root *root, struct btrfs_path *path,
struct btrfs_key *key)
{
int ret;
struct btrfs_key found_key;
struct extent_buffer *leaf;
int slot;
ret = btrfs_search_slot(NULL, root, key, path, 0, 0);
if (ret < 0)
return ret;
while(1) {
slot = path->slots[0];
leaf = path->nodes[0];
if (slot >= btrfs_header_nritems(leaf)) {
ret = btrfs_next_leaf(root, path);
if (ret == 0)
continue;
if (ret < 0)
goto error;
break;
}
btrfs_item_key_to_cpu(leaf, &found_key, slot);
if (found_key.objectid >= key->objectid &&
found_key.type == BTRFS_BLOCK_GROUP_ITEM_KEY)
return 0;
path->slots[0]++;
}
ret = -ENOENT;
error:
return ret;
}
int btrfs_read_block_groups(struct btrfs_root *root)
{
struct btrfs_path *path;
int ret;
int err = 0;
int bit;
struct btrfs_block_group_cache *cache;
struct btrfs_fs_info *info = root->fs_info;
@ -2702,28 +2503,28 @@ int btrfs_read_block_groups(struct btrfs_root *root)
struct extent_buffer *leaf;
block_group_cache = &info->block_group_cache;
root = info->extent_root;
key.objectid = 0;
key.offset = BTRFS_BLOCK_GROUP_SIZE;
key.offset = 0;
btrfs_set_key_type(&key, BTRFS_BLOCK_GROUP_ITEM_KEY);
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
while(1) {
ret = btrfs_search_slot(NULL, info->extent_root,
&key, path, 0, 0);
if (ret != 0) {
err = ret;
break;
ret = find_first_block_group(root, path, &key);
if (ret > 0) {
ret = 0;
goto error;
}
if (ret != 0)
goto error;
leaf = path->nodes[0];
btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
cache = kmalloc(sizeof(*cache), GFP_NOFS);
if (!cache) {
err = -1;
ret = -ENOMEM;
break;
}
@ -2733,18 +2534,17 @@ int btrfs_read_block_groups(struct btrfs_root *root)
memcpy(&cache->key, &found_key, sizeof(found_key));
cache->cached = 0;
cache->pinned = 0;
key.objectid = found_key.objectid + found_key.offset;
btrfs_release_path(root, path);
if (cache->item.flags & BTRFS_BLOCK_GROUP_MIXED) {
bit = BLOCK_GROUP_DATA | BLOCK_GROUP_METADATA;
cache->data = BTRFS_BLOCK_GROUP_MIXED;
} else if (cache->item.flags & BTRFS_BLOCK_GROUP_DATA) {
cache->flags = btrfs_block_group_flags(&cache->item);
bit = 0;
if (cache->flags & BTRFS_BLOCK_GROUP_DATA) {
bit = BLOCK_GROUP_DATA;
cache->data = BTRFS_BLOCK_GROUP_DATA;
} else {
} else if (cache->flags & BTRFS_BLOCK_GROUP_SYSTEM) {
bit = BLOCK_GROUP_SYSTEM;
} else if (cache->flags & BTRFS_BLOCK_GROUP_METADATA) {
bit = BLOCK_GROUP_METADATA;
cache->data = 0;
}
/* use EXTENT_LOCKED to prevent merging */
@ -2758,7 +2558,8 @@ int btrfs_read_block_groups(struct btrfs_root *root)
btrfs_super_total_bytes(&info->super_copy))
break;
}
ret = 0;
error:
btrfs_free_path(path);
return 0;
return ret;
}

6
fs/btrfs/extent_io.c
View File

@ -1706,9 +1706,9 @@ static int submit_one_bio(int rw, struct bio *bio)
WARN_ON(1);
}
if (tree->ops && tree->ops->submit_bio_hook)
tree->ops->submit_bio_hook(rw, bio);
submit_bio(rw, bio);
tree->ops->submit_bio_hook(page->mapping->host, rw, bio);
else
submit_bio(rw, bio);
if (bio_flagged(bio, BIO_EOPNOTSUPP))
ret = -EOPNOTSUPP;
bio_put(bio);

2
fs/btrfs/extent_io.h
View File

@ -28,7 +28,7 @@ struct extent_state;
struct extent_io_ops {
int (*fill_delalloc)(struct inode *inode, u64 start, u64 end);
int (*writepage_io_hook)(struct page *page, u64 start, u64 end);
int (*submit_bio_hook)(int rw, struct bio *bio);
int (*submit_bio_hook)(struct inode *inode, int rw, struct bio *bio);
int (*readpage_io_hook)(struct page *page, u64 start, u64 end);
int (*readpage_end_io_hook)(struct page *page, u64 start, u64 end,
struct extent_state *state);

26
fs/btrfs/inode.c
View File

@ -40,6 +40,7 @@
#include "btrfs_inode.h"
#include "ioctl.h"
#include "print-tree.h"
#include "volumes.h"
struct btrfs_iget_args {
u64 ino;
@ -295,20 +296,20 @@ int btrfs_clear_bit_hook(struct inode *inode, u64 start, u64 end,
return 0;
}
int btrfs_submit_bio_hook(int rw, struct bio *bio)
int btrfs_submit_bio_hook(struct inode *inode, int rw, struct bio *bio)
{
struct bio_vec *bvec = bio->bi_io_vec;
struct inode *inode = bvec->bv_page->mapping->host;
struct btrfs_root *root = BTRFS_I(inode)->root;
struct btrfs_trans_handle *trans;
int ret = 0;
if (rw != WRITE)
return 0;
if (rw != WRITE) {
goto mapit;
}
if (btrfs_test_opt(root, NODATASUM) ||
btrfs_test_flag(inode, NODATASUM))
return 0;
btrfs_test_flag(inode, NODATASUM)) {
goto mapit;
}
mutex_lock(&root->fs_info->fs_mutex);
trans = btrfs_start_transaction(root, 1);
@ -317,7 +318,8 @@ int btrfs_submit_bio_hook(int rw, struct bio *bio)
ret = btrfs_end_transaction(trans, root);
BUG_ON(ret);
mutex_unlock(&root->fs_info->fs_mutex);
return ret;
mapit:
return btrfs_map_bio(root, rw, bio);
}
int btrfs_readpage_io_hook(struct page *page, u64 start, u64 end)
@ -406,7 +408,7 @@ void btrfs_read_locked_inode(struct inode *inode)
struct btrfs_path *path;
struct extent_buffer *leaf;
struct btrfs_inode_item *inode_item;
struct btrfs_inode_timespec *tspec;
struct btrfs_timespec *tspec;
struct btrfs_root *root = BTRFS_I(inode)->root;
struct btrfs_key location;
u64 alloc_group_block;
@ -455,7 +457,8 @@ void btrfs_read_locked_inode(struct inode *inode)
BTRFS_I(inode)->flags = btrfs_inode_flags(leaf, inode_item);
if (!BTRFS_I(inode)->block_group) {
BTRFS_I(inode)->block_group = btrfs_find_block_group(root,
NULL, 0, 0, 0);
NULL, 0,
BTRFS_BLOCK_GROUP_METADATA, 0);
}
btrfs_free_path(path);
inode_item = NULL;
@ -1550,7 +1553,8 @@ static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans,
owner = 0;
else
owner = 1;
group = btrfs_find_block_group(root, group, 0, 0, owner);
group = btrfs_find_block_group(root, group, 0,
BTRFS_BLOCK_GROUP_METADATA, owner);
BTRFS_I(inode)->block_group = group;
BTRFS_I(inode)->flags = 0;

48
fs/btrfs/print-tree.c
View File

@ -20,6 +20,40 @@
#include "disk-io.h"
#include "print-tree.h"
static void print_chunk(struct extent_buffer *eb, struct btrfs_chunk *chunk)
{
int num_stripes = btrfs_chunk_num_stripes(eb, chunk);
int i;
printk("\t\tchunk owner %llu type %llu num_stripes %d\n",
(unsigned long long)btrfs_chunk_owner(eb, chunk),
(unsigned long long)btrfs_chunk_type(eb, chunk),
num_stripes);
for (i = 0 ; i < num_stripes ; i++) {
printk("\t\t\tstripe %d devid %llu offset %llu\n", i,
(unsigned long long)btrfs_stripe_devid_nr(eb, chunk, i),
(unsigned long long)btrfs_stripe_offset_nr(eb, chunk, i));
}
}
static void print_dev_item(struct extent_buffer *eb,
struct btrfs_dev_item *dev_item)
{
char *name;
int name_len;
name_len = btrfs_device_name_len(eb, dev_item);
name = kmalloc(name_len, GFP_NOFS);
if (name) {
read_extent_buffer(eb, name,
(unsigned long)btrfs_device_name(dev_item),
name_len);
}
printk("\t\tdev item name %.*s devid %llu "
"total_bytes %llu bytes used %Lu\n", name_len, name,
(unsigned long long)btrfs_device_id(eb, dev_item),
(unsigned long long)btrfs_device_total_bytes(eb, dev_item),
(unsigned long long)btrfs_device_bytes_used(eb, dev_item));
kfree(name);
}
void btrfs_print_leaf(struct btrfs_root *root, struct extent_buffer *l)
{
int i;
@ -34,6 +68,7 @@ void btrfs_print_leaf(struct btrfs_root *root, struct extent_buffer *l)
struct btrfs_key key;
struct btrfs_key found_key;
struct btrfs_extent_ref *ref;
struct btrfs_dev_extent *dev_extent;
u32 type;
printk("leaf %llu total ptrs %d free space %d\n",
@ -106,6 +141,19 @@ void btrfs_print_leaf(struct btrfs_root *root, struct extent_buffer *l)
printk("\t\tblock group used %llu\n",
(unsigned long long)btrfs_disk_block_group_used(l, bi));
break;
case BTRFS_CHUNK_ITEM_KEY:
print_chunk(l, btrfs_item_ptr(l, i, struct btrfs_chunk));
break;
case BTRFS_DEV_ITEM_KEY:
print_dev_item(l, btrfs_item_ptr(l, i,
struct btrfs_dev_item));
break;
case BTRFS_DEV_EXTENT_KEY:
dev_extent = btrfs_item_ptr(l, i,
struct btrfs_dev_extent);
printk("\t\tdev extent owner %llu length %llu\n",
(unsigned long long)btrfs_dev_extent_owner(l, dev_extent),
(unsigned long long)btrfs_dev_extent_length(l, dev_extent));
};
}
}

54
fs/btrfs/transaction.c
View File

@ -198,29 +198,42 @@ int btrfs_write_and_wait_transaction(struct btrfs_trans_handle *trans,
return werr;
}
static int update_cowonly_root(struct btrfs_trans_handle *trans,
struct btrfs_root *root)
{
int ret;
u64 old_root_bytenr;
struct btrfs_root *tree_root = root->fs_info->tree_root;
btrfs_write_dirty_block_groups(trans, root);
while(1) {
old_root_bytenr = btrfs_root_bytenr(&root->root_item);
if (old_root_bytenr == root->node->start)
break;
btrfs_set_root_bytenr(&root->root_item,
root->node->start);
btrfs_set_root_level(&root->root_item,
btrfs_header_level(root->node));
ret = btrfs_update_root(trans, tree_root,
&root->root_key,
&root->root_item);
BUG_ON(ret);
btrfs_write_dirty_block_groups(trans, root);
}
return 0;
}
int btrfs_commit_tree_roots(struct btrfs_trans_handle *trans,
struct btrfs_root *root)
{
int ret;
u64 old_extent_block;
struct btrfs_fs_info *fs_info = root->fs_info;
struct btrfs_root *tree_root = fs_info->tree_root;
struct btrfs_root *extent_root = fs_info->extent_root;
struct list_head *next;
btrfs_write_dirty_block_groups(trans, extent_root);
while(1) {
old_extent_block = btrfs_root_bytenr(&extent_root->root_item);
if (old_extent_block == extent_root->node->start)
break;
btrfs_set_root_bytenr(&extent_root->root_item,
extent_root->node->start);
btrfs_set_root_level(&extent_root->root_item,
btrfs_header_level(extent_root->node));
ret = btrfs_update_root(trans, tree_root,
&extent_root->root_key,
&extent_root->root_item);
BUG_ON(ret);
btrfs_write_dirty_block_groups(trans, extent_root);
while(!list_empty(&fs_info->dirty_cowonly_roots)) {
next = fs_info->dirty_cowonly_roots.next;
list_del_init(next);
root = list_entry(next, struct btrfs_root, dirty_list);
update_cowonly_root(trans, root);
}
return 0;
}
@ -616,6 +629,7 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
unsigned long timeout = 1;
struct btrfs_transaction *cur_trans;
struct btrfs_transaction *prev_trans = NULL;
struct btrfs_root *chunk_root = root->fs_info->chunk_root;
struct list_head dirty_fs_roots;
struct extent_io_tree *pinned_copy;
DEFINE_WAIT(wait);
@ -714,6 +728,10 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
btrfs_set_super_root_level(&root->fs_info->super_copy,
btrfs_header_level(root->fs_info->tree_root->node));
btrfs_set_super_chunk_root(&root->fs_info->super_copy,
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));

852
fs/btrfs/volumes.c Normal file
View File

@ -0,0 +1,852 @@
/*
* Copyright (C) 2007 Oracle. All rights reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public
* License v2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public
* License along with this program; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 021110-1307, USA.
*/
#include <linux/sched.h>
#include <linux/bio.h>
#include "ctree.h"
#include "extent_map.h"
#include "disk-io.h"
#include "transaction.h"
#include "print-tree.h"
#include "volumes.h"
struct map_lookup {
struct btrfs_device *dev;
u64 physical;
};
/*
* this uses a pretty simple search, the expectation is that it is
* called very infrequently and that a given device has a small number
* of extents
*/
static int find_free_dev_extent(struct btrfs_trans_handle *trans,
struct btrfs_device *device,
struct btrfs_path *path,
u64 num_bytes, u64 *start)
{
struct btrfs_key key;
struct btrfs_root *root = device->dev_root;
struct btrfs_dev_extent *dev_extent = NULL;
u64 hole_size = 0;
u64 last_byte = 0;
u64 search_start = 0;
u64 search_end = device->total_bytes;
int ret;
int slot = 0;
int start_found;
struct extent_buffer *l;
start_found = 0;
path->reada = 2;
/* FIXME use last free of some kind */
key.objectid = device->devid;
key.offset = search_start;
key.type = BTRFS_DEV_EXTENT_KEY;
ret = btrfs_search_slot(trans, root, &key, path, 0, 0);
if (ret < 0)
goto error;
ret = btrfs_previous_item(root, path, 0, key.type);
if (ret < 0)
goto error;
l = path->nodes[0];
btrfs_item_key_to_cpu(l, &key, path->slots[0]);
while (1) {
l = path->nodes[0];
slot = path->slots[0];
if (slot >= btrfs_header_nritems(l)) {
ret = btrfs_next_leaf(root, path);
if (ret == 0)
continue;
if (ret < 0)
goto error;
no_more_items:
if (!start_found) {
if (search_start >= search_end) {
ret = -ENOSPC;
goto error;
}
*start = search_start;
start_found = 1;
goto check_pending;
}
*start = last_byte > search_start ?
last_byte : search_start;
if (search_end <= *start) {
ret = -ENOSPC;
goto error;
}
goto check_pending;
}
btrfs_item_key_to_cpu(l, &key, slot);
if (key.objectid < device->devid)
goto next;
if (key.objectid > device->devid)
goto no_more_items;
if (key.offset >= search_start && key.offset > last_byte &&
start_found) {
if (last_byte < search_start)
last_byte = search_start;
hole_size = key.offset - last_byte;
if (key.offset > last_byte &&
hole_size >= num_bytes) {
*start = last_byte;
goto check_pending;
}
}
if (btrfs_key_type(&key) != BTRFS_DEV_EXTENT_KEY) {
goto next;
}
start_found = 1;
dev_extent = btrfs_item_ptr(l, slot, struct btrfs_dev_extent);
last_byte = key.offset + btrfs_dev_extent_length(l, dev_extent);
next:
path->slots[0]++;
cond_resched();
}
check_pending:
/* we have to make sure we didn't find an extent that has already
* been allocated by the map tree or the original allocation
*/
btrfs_release_path(root, path);
BUG_ON(*start < search_start);
if (*start + num_bytes >= search_end) {
ret = -ENOSPC;
goto error;
}
/* check for pending inserts here */
return 0;
error:
btrfs_release_path(root, path);
return ret;
}
int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans,
struct btrfs_device *device,
u64 owner, u64 num_bytes, u64 *start)
{
int ret;
struct btrfs_path *path;
struct btrfs_root *root = device->dev_root;
struct btrfs_dev_extent *extent;
struct extent_buffer *leaf;
struct btrfs_key key;
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
ret = find_free_dev_extent(trans, device, path, num_bytes, start);
if (ret)
goto err;
key.objectid = device->devid;
key.offset = *start;
key.type = BTRFS_DEV_EXTENT_KEY;
ret = btrfs_insert_empty_item(trans, root, path, &key,
sizeof(*extent));
BUG_ON(ret);
leaf = path->nodes[0];
extent = btrfs_item_ptr(leaf, path->slots[0],
struct btrfs_dev_extent);
btrfs_set_dev_extent_owner(leaf, extent, owner);
btrfs_set_dev_extent_length(leaf, extent, num_bytes);
btrfs_mark_buffer_dirty(leaf);
err:
btrfs_free_path(path);
return ret;
}
static int find_next_chunk(struct btrfs_root *root, u64 *objectid)
{
struct btrfs_path *path;
int ret;
struct btrfs_key key;
struct btrfs_key found_key;
path = btrfs_alloc_path();
BUG_ON(!path);
key.objectid = (u64)-1;
key.offset = (u64)-1;
key.type = BTRFS_CHUNK_ITEM_KEY;
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
if (ret < 0)
goto error;
BUG_ON(ret == 0);
ret = btrfs_previous_item(root, path, 0, BTRFS_CHUNK_ITEM_KEY);
if (ret) {
*objectid = 0;
} else {
btrfs_item_key_to_cpu(path->nodes[0], &found_key,
path->slots[0]);
*objectid = found_key.objectid + found_key.offset;
}
ret = 0;
error:
btrfs_free_path(path);
return ret;
}
static struct btrfs_device *next_device(struct list_head *head,
struct list_head *last)
{
struct list_head *next = last->next;
struct btrfs_device *dev;
if (list_empty(head))
return NULL;
if (next == head)
next = next->next;
dev = list_entry(next, struct btrfs_device, dev_list);
return dev;
}
static int find_next_devid(struct btrfs_root *root, struct btrfs_path *path,
u64 *objectid)
{
int ret;
struct btrfs_key key;
struct btrfs_key found_key;
key.objectid = BTRFS_DEV_ITEMS_OBJECTID;
key.type = BTRFS_DEV_ITEM_KEY;
key.offset = (u64)-1;
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
if (ret < 0)
goto error;
BUG_ON(ret == 0);
ret = btrfs_previous_item(root, path, BTRFS_DEV_ITEMS_OBJECTID,
BTRFS_DEV_ITEM_KEY);
if (ret) {
*objectid = 1;
} else {
btrfs_item_key_to_cpu(path->nodes[0], &found_key,
path->slots[0]);
*objectid = found_key.offset + 1;
}
ret = 0;
error:
btrfs_release_path(root, path);
return ret;
}
/*
* the device information is stored in the chunk root
* the btrfs_device struct should be fully filled in
*/
int btrfs_add_device(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct btrfs_device *device)
{
int ret;
struct btrfs_path *path;
struct btrfs_dev_item *dev_item;
struct extent_buffer *leaf;
struct btrfs_key key;
unsigned long ptr;
u64 free_devid;
root = root->fs_info->chunk_root;
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
ret = find_next_devid(root, path, &free_devid);
if (ret)
goto out;
key.objectid = BTRFS_DEV_ITEMS_OBJECTID;
key.type = BTRFS_DEV_ITEM_KEY;
key.offset = free_devid;
ret = btrfs_insert_empty_item(trans, root, path, &key,
sizeof(*dev_item) + device->name_len);
if (ret)
goto out;
leaf = path->nodes[0];
dev_item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_dev_item);
btrfs_set_device_id(leaf, dev_item, device->devid);
btrfs_set_device_type(leaf, dev_item, device->type);
btrfs_set_device_io_align(leaf, dev_item, device->io_align);
btrfs_set_device_io_width(leaf, dev_item, device->io_width);
btrfs_set_device_sector_size(leaf, dev_item, device->sector_size);
btrfs_set_device_rdev(leaf, dev_item, device->rdev);
btrfs_set_device_partition(leaf, dev_item, device->partition);
btrfs_set_device_name_len(leaf, dev_item, device->name_len);
btrfs_set_device_total_bytes(leaf, dev_item, device->total_bytes);
btrfs_set_device_bytes_used(leaf, dev_item, device->bytes_used);
ptr = (unsigned long)btrfs_device_name(dev_item);
write_extent_buffer(leaf, device->name, ptr, device->name_len);
ptr = (unsigned long)btrfs_device_uuid(dev_item);
write_extent_buffer(leaf, device->uuid, ptr, BTRFS_DEV_UUID_SIZE);
btrfs_mark_buffer_dirty(leaf);
ret = 0;
out:
btrfs_free_path(path);
return ret;
}
int btrfs_update_device(struct btrfs_trans_handle *trans,
struct btrfs_device *device)
{
int ret;
struct btrfs_path *path;
struct btrfs_root *root;
struct btrfs_dev_item *dev_item;
struct extent_buffer *leaf;
struct btrfs_key key;
root = device->dev_root->fs_info->chunk_root;
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
key.objectid = BTRFS_DEV_ITEMS_OBJECTID;
key.type = BTRFS_DEV_ITEM_KEY;
key.offset = device->devid;
ret = btrfs_search_slot(trans, root, &key, path, 0, 1);
if (ret < 0)
goto out;
if (ret > 0) {
ret = -ENOENT;
goto out;
}
leaf = path->nodes[0];
dev_item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_dev_item);
btrfs_set_device_id(leaf, dev_item, device->devid);
btrfs_set_device_type(leaf, dev_item, device->type);
btrfs_set_device_io_align(leaf, dev_item, device->io_align);
btrfs_set_device_io_width(leaf, dev_item, device->io_width);
btrfs_set_device_sector_size(leaf, dev_item, device->sector_size);
btrfs_set_device_rdev(leaf, dev_item, device->rdev);
btrfs_set_device_partition(leaf, dev_item, device->partition);
btrfs_set_device_total_bytes(leaf, dev_item, device->total_bytes);
btrfs_set_device_bytes_used(leaf, dev_item, device->bytes_used);
btrfs_mark_buffer_dirty(leaf);
out:
btrfs_free_path(path);
return ret;
}
int btrfs_add_system_chunk(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct btrfs_key *key,
struct btrfs_chunk *chunk, int item_size)
{
struct btrfs_super_block *super_copy = &root->fs_info->super_copy;
struct btrfs_disk_key disk_key;
u32 array_size;
u8 *ptr;
array_size = btrfs_super_sys_array_size(super_copy);
if (array_size + item_size > BTRFS_SYSTEM_CHUNK_ARRAY_SIZE)
return -EFBIG;
ptr = super_copy->sys_chunk_array + array_size;
btrfs_cpu_key_to_disk(&disk_key, key);
memcpy(ptr, &disk_key, sizeof(disk_key));
ptr += sizeof(disk_key);
memcpy(ptr, chunk, item_size);
item_size += sizeof(disk_key);
btrfs_set_super_sys_array_size(super_copy, array_size + item_size);
return 0;
}
int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
struct btrfs_root *extent_root, u64 *start,
u64 *num_bytes, u32 type)
{
u64 dev_offset;
struct btrfs_root *chunk_root = extent_root->fs_info->chunk_root;
struct btrfs_stripe *stripes;
struct btrfs_device *device = NULL;
struct btrfs_chunk *chunk;
struct list_head *dev_list = &extent_root->fs_info->devices;
struct list_head *last_dev = extent_root->fs_info->last_device;
struct extent_map_tree *em_tree;
struct map_lookup *map;
struct extent_map *em;
u64 physical;
u64 calc_size = 1024 * 1024 * 1024;
int num_stripes;
int ret;
int index = 0;
struct btrfs_key key;
ret = find_next_chunk(chunk_root, &key.objectid);
if (ret)
return ret;
num_stripes = 1;
chunk = kmalloc(btrfs_chunk_item_size(num_stripes), GFP_NOFS);
if (!chunk)
return -ENOMEM;
stripes = &chunk->stripe;
*num_bytes = calc_size;
while(index < num_stripes) {
device = next_device(dev_list, last_dev);
BUG_ON(!device);
last_dev = &device->dev_list;
extent_root->fs_info->last_device = last_dev;
ret = btrfs_alloc_dev_extent(trans, device,
key.objectid,
calc_size, &dev_offset);
BUG_ON(ret);
device->bytes_used += calc_size;
ret = btrfs_update_device(trans, device);
BUG_ON(ret);
btrfs_set_stack_stripe_devid(stripes + index, device->devid);
btrfs_set_stack_stripe_offset(stripes + index, dev_offset);
physical = dev_offset;
index++;
}
/* key.objectid was set above */
key.offset = *num_bytes;
key.type = BTRFS_CHUNK_ITEM_KEY;
btrfs_set_stack_chunk_owner(chunk, extent_root->root_key.objectid);
btrfs_set_stack_chunk_stripe_len(chunk, 64 * 1024);
btrfs_set_stack_chunk_type(chunk, type);
btrfs_set_stack_chunk_num_stripes(chunk, num_stripes);
btrfs_set_stack_chunk_io_align(chunk, extent_root->sectorsize);
btrfs_set_stack_chunk_io_width(chunk, extent_root->sectorsize);
btrfs_set_stack_chunk_sector_size(chunk, extent_root->sectorsize);
ret = btrfs_insert_item(trans, chunk_root, &key, chunk,
btrfs_chunk_item_size(num_stripes));
BUG_ON(ret);
*start = key.objectid;
em = alloc_extent_map(GFP_NOFS);
if (!em)
return -ENOMEM;
map = kmalloc(sizeof(*map), GFP_NOFS);
if (!map) {
free_extent_map(em);
return -ENOMEM;
}
em->bdev = (struct block_device *)map;
em->start = key.objectid;
em->len = key.offset;
em->block_start = 0;
map->physical = physical;
map->dev = device;
if (!map->dev) {
kfree(map);
free_extent_map(em);
return -EIO;
}
kfree(chunk);
em_tree = &extent_root->fs_info->mapping_tree.map_tree;
spin_lock(&em_tree->lock);
ret = add_extent_mapping(em_tree, em);
BUG_ON(ret);
spin_unlock(&em_tree->lock);
free_extent_map(em);
return ret;
}
void btrfs_mapping_init(struct btrfs_mapping_tree *tree)
{
extent_map_tree_init(&tree->map_tree, GFP_NOFS);
}
void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree)
{
struct extent_map *em;
while(1) {
spin_lock(&tree->map_tree.lock);
em = lookup_extent_mapping(&tree->map_tree, 0, (u64)-1);
if (em)
remove_extent_mapping(&tree->map_tree, em);
spin_unlock(&tree->map_tree.lock);
if (!em)
break;
kfree(em->bdev);
/* once for us */
free_extent_map(em);
/* once for the tree */
free_extent_map(em);
}
}
int btrfs_map_block(struct btrfs_mapping_tree *map_tree,
u64 logical, u64 *phys, u64 *length,
struct btrfs_device **dev)
{
struct extent_map *em;
struct map_lookup *map;
struct extent_map_tree *em_tree = &map_tree->map_tree;
u64 offset;
spin_lock(&em_tree->lock);
em = lookup_extent_mapping(em_tree, logical, *length);
BUG_ON(!em);
BUG_ON(em->start > logical || em->start + em->len < logical);
map = (struct map_lookup *)em->bdev;
offset = logical - em->start;
*phys = map->physical + offset;
*length = em->len - offset;
*dev = map->dev;
free_extent_map(em);
spin_unlock(&em_tree->lock);
return 0;
}
int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio)
{
struct btrfs_mapping_tree *map_tree;
struct btrfs_device *dev;
u64 logical = bio->bi_sector << 9;
u64 physical;
u64 length = 0;
u64 map_length;
struct bio_vec *bvec;
int i;
int ret;
bio_for_each_segment(bvec, bio, i) {
length += bvec->bv_len;
}
map_tree = &root->fs_info->mapping_tree;
map_length = length;
ret = btrfs_map_block(map_tree, logical, &physical, &map_length, &dev);
BUG_ON(map_length < length);
bio->bi_sector = physical >> 9;
bio->bi_bdev = dev->bdev;
submit_bio(rw, bio);
return 0;
}
struct btrfs_device *btrfs_find_device(struct btrfs_root *root, u64 devid)
{
struct btrfs_device *dev;
struct list_head *cur = root->fs_info->devices.next;
struct list_head *head = &root->fs_info->devices;
while(cur != head) {
dev = list_entry(cur, struct btrfs_device, dev_list);
if (dev->devid == devid)
return dev;
cur = cur->next;
}
return NULL;
}
static int read_one_chunk(struct btrfs_root *root, struct btrfs_key *key,
struct extent_buffer *leaf,
struct btrfs_chunk *chunk)
{
struct btrfs_mapping_tree *map_tree = &root->fs_info->mapping_tree;
struct map_lookup *map;
struct extent_map *em;
u64 logical;
u64 length;
u64 devid;
int ret;
logical = key->objectid;
length = key->offset;
spin_lock(&map_tree->map_tree.lock);
em = lookup_extent_mapping(&map_tree->map_tree, logical, 1);
/* already mapped? */
if (em && em->start <= logical && em->start + em->len > logical) {
free_extent_map(em);
spin_unlock(&map_tree->map_tree.lock);
return 0;
} else if (em) {
free_extent_map(em);
}
spin_unlock(&map_tree->map_tree.lock);
map = kzalloc(sizeof(*map), GFP_NOFS);
if (!map)
return -ENOMEM;
em = alloc_extent_map(GFP_NOFS);
if (!em)
return -ENOMEM;
map = kmalloc(sizeof(*map), GFP_NOFS);
if (!map) {
free_extent_map(em);
return -ENOMEM;
}
em->bdev = (struct block_device *)map;
em->start = logical;
em->len = length;
em->block_start = 0;
map->physical = btrfs_stripe_offset_nr(leaf, chunk, 0);
devid = btrfs_stripe_devid_nr(leaf, chunk, 0);
map->dev = btrfs_find_device(root, devid);
if (!map->dev) {
kfree(map);
free_extent_map(em);
return -EIO;
}
spin_lock(&map_tree->map_tree.lock);
ret = add_extent_mapping(&map_tree->map_tree, em);
BUG_ON(ret);
spin_unlock(&map_tree->map_tree.lock);
free_extent_map(em);
return 0;
}
static int fill_device_from_item(struct extent_buffer *leaf,
struct btrfs_dev_item *dev_item,
struct btrfs_device *device)
{
unsigned long ptr;
char *name;
device->devid = btrfs_device_id(leaf, dev_item);
device->total_bytes = btrfs_device_total_bytes(leaf, dev_item);
device->bytes_used = btrfs_device_bytes_used(leaf, dev_item);
device->type = btrfs_device_type(leaf, dev_item);
device->io_align = btrfs_device_io_align(leaf, dev_item);
device->io_width = btrfs_device_io_width(leaf, dev_item);
device->sector_size = btrfs_device_sector_size(leaf, dev_item);
device->rdev = btrfs_device_rdev(leaf, dev_item);
device->partition = btrfs_device_partition(leaf, dev_item);
device->name_len = btrfs_device_name_len(leaf, dev_item);
ptr = (unsigned long)btrfs_device_uuid(dev_item);
read_extent_buffer(leaf, device->uuid, ptr, BTRFS_DEV_UUID_SIZE);
name = kmalloc(device->name_len + 1, GFP_NOFS);
if (!name)
return -ENOMEM;
device->name = name;
ptr = (unsigned long)btrfs_device_name(dev_item);
read_extent_buffer(leaf, name, ptr, device->name_len);
name[device->name_len] = '\0';
return 0;
}
static int read_one_dev(struct btrfs_root *root, struct btrfs_key *key,
struct extent_buffer *leaf,
struct btrfs_dev_item *dev_item)
{
struct btrfs_device *device;
u64 devid;
int ret;
devid = btrfs_device_id(leaf, dev_item);
if (btrfs_find_device(root, devid))
return 0;
device = kmalloc(sizeof(*device), GFP_NOFS);
if (!device)
return -ENOMEM;
fill_device_from_item(leaf, dev_item, device);
device->dev_root = root->fs_info->dev_root;
device->bdev = root->fs_info->sb->s_bdev;
list_add(&device->dev_list, &root->fs_info->devices);
memcpy(&device->dev_key, key, sizeof(*key));
ret = 0;
#if 0
ret = btrfs_open_device(device);
if (ret) {
kfree(device);
}
#endif
return ret;
}
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 btrfs_disk_key *disk_key;
struct btrfs_dev_item *dev_item;
struct btrfs_chunk *chunk;
struct btrfs_key key;
u32 num_stripes;
u32 array_size;
u32 len = 0;
u8 *ptr;
unsigned long sb_ptr;
u32 cur;
int ret;
int dev_only = 1;
array_size = btrfs_super_sys_array_size(super_copy);
/*
* we do this loop twice, once for the device items and
* once for all of the chunks. This way there are device
* structs filled in for every chunk
*/
again:
ptr = super_copy->sys_chunk_array;
sb_ptr = offsetof(struct btrfs_super_block, sys_chunk_array);
cur = 0;
while (cur < array_size) {
disk_key = (struct btrfs_disk_key *)ptr;
btrfs_disk_key_to_cpu(&key, disk_key);
len = sizeof(*disk_key);
ptr += len;
sb_ptr += len;
cur += len;
if (key.objectid == BTRFS_DEV_ITEMS_OBJECTID &&
key.type == BTRFS_DEV_ITEM_KEY) {
dev_item = (struct btrfs_dev_item *)sb_ptr;
if (dev_only) {
ret = read_one_dev(root, &key, sb, dev_item);
BUG_ON(ret);
}
len = sizeof(*dev_item);
len += btrfs_device_name_len(sb, dev_item);
} else if (key.type == BTRFS_CHUNK_ITEM_KEY) {
chunk = (struct btrfs_chunk *)sb_ptr;
if (!dev_only) {
ret = read_one_chunk(root, &key, sb, chunk);
BUG_ON(ret);
}
num_stripes = btrfs_chunk_num_stripes(sb, chunk);
len = btrfs_chunk_item_size(num_stripes);
} else {
BUG();
}
ptr += len;
sb_ptr += len;
cur += len;
}
if (dev_only == 1) {
dev_only = 0;
goto again;
}
return 0;
}
int btrfs_read_chunk_tree(struct btrfs_root *root)
{
struct btrfs_path *path;
struct extent_buffer *leaf;
struct btrfs_key key;
struct btrfs_key found_key;
int ret;
int slot;
root = root->fs_info->chunk_root;
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
/* first we search for all of the device items, and then we
* read in all of the chunk items. This way we can create chunk
* mappings that reference all of the devices that are afound
*/
key.objectid = BTRFS_DEV_ITEMS_OBJECTID;
key.offset = 0;
key.type = 0;
again:
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
while(1) {
leaf = path->nodes[0];
slot = path->slots[0];
if (slot >= btrfs_header_nritems(leaf)) {
ret = btrfs_next_leaf(root, path);
if (ret == 0)
continue;
if (ret < 0)
goto error;
break;
}
btrfs_item_key_to_cpu(leaf, &found_key, slot);
if (key.objectid == BTRFS_DEV_ITEMS_OBJECTID) {
if (found_key.objectid != BTRFS_DEV_ITEMS_OBJECTID)
break;
if (found_key.type == BTRFS_DEV_ITEM_KEY) {
struct btrfs_dev_item *dev_item;
dev_item = btrfs_item_ptr(leaf, slot,
struct btrfs_dev_item);
ret = read_one_dev(root, &found_key, leaf,
dev_item);
BUG_ON(ret);
}
} else if (found_key.type == BTRFS_CHUNK_ITEM_KEY) {
struct btrfs_chunk *chunk;
chunk = btrfs_item_ptr(leaf, slot, struct btrfs_chunk);
ret = read_one_chunk(root, &found_key, leaf, chunk);
}
path->slots[0]++;
}
if (key.objectid == BTRFS_DEV_ITEMS_OBJECTID) {
key.objectid = 0;
btrfs_release_path(root, path);
goto again;
}
btrfs_free_path(path);
ret = 0;
error:
return ret;
}

78
fs/btrfs/volumes.h Normal file
View File

@ -0,0 +1,78 @@
/*
* Copyright (C) 2007 Oracle. All rights reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public
* License v2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public
* License along with this program; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 021110-1307, USA.
*/
#ifndef __BTRFS_VOLUMES_
#define __BTRFS_VOLUMES_
struct btrfs_device {
struct list_head dev_list;
struct btrfs_root *dev_root;
struct btrfs_key dev_key;
struct block_device *bdev;
/* the internal btrfs device id */
u64 devid;
/* size of the device */
u64 total_bytes;
/* bytes used */
u64 bytes_used;
/* optimal io alignment for this device */
u32 io_align;
/* optimal io width for this device */
u32 io_width;
/* minimal io size for this device */
u32 sector_size;
/* the kernel device number */
u64 rdev;
/* type and info about this device */
u64 type;
/* partition number, 0 for whole dev */
int partition;
/* length of the name data at the end of the item */
int name_len;
/* physical drive uuid (or lvm uuid) */
u8 uuid[BTRFS_DEV_UUID_SIZE];
char *name;
};
int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans,
struct btrfs_device *device,
u64 owner, u64 num_bytes, u64 *start);
int btrfs_map_block(struct btrfs_mapping_tree *map_tree,
u64 logical, u64 *phys, u64 *length,
struct btrfs_device **dev);
int btrfs_read_sys_array(struct btrfs_root *root);
int btrfs_read_chunk_tree(struct btrfs_root *root);
int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
struct btrfs_root *extent_root, u64 *start,
u64 *num_bytes, u32 type);
void btrfs_mapping_init(struct btrfs_mapping_tree *tree);
void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree);
int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio);
#endif