Btrfs: Add support for multiple devices per filesystem
Signed-off-by: Chris Mason <chris.mason@oracle.com>
diff --git a/fs/btrfs/Makefile b/fs/btrfs/Makefile
index 9c61609..5ac6f29 100644
--- a/fs/btrfs/Makefile
+++ b/fs/btrfs/Makefile
@@ -6,7 +6,7 @@
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
diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index ef8809c..70b6ddf 100644
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -70,6 +70,14 @@
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 @@
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 @@
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 @@
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 @@
/* 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 @@
}
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;
+}
+
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 92d892f..1453d99 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -40,12 +40,44 @@
#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 @@
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 @@
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 @@
__le64 magic;
__le64 generation;
__le64 root;
+ __le64 chunk_root;
__le64 total_bytes;
__le64 bytes_used;
__le64 root_dir_objectid;
@@ -138,7 +253,10 @@
__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 @@
__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 @@
__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 @@
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 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_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 @@
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 @@
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 @@
*/
#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 @@
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_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_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 @@
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,
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 88e21bd..8e37fa1 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -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 @@
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 @@
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 @@
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 @@
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 @@
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 @@
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 @@
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 @@
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 @@
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 @@
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 @@
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 @@
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 @@
static struct extent_io_ops btree_extent_io_ops = {
.writepage_io_hook = btree_writepage_io_hook,
+ .submit_bio_hook = btree_submit_bio_hook,
};
diff --git a/fs/btrfs/disk-io.h b/fs/btrfs/disk-io.h
index 828f3a2..206cb48 100644
--- a/fs/btrfs/disk-io.h
+++ b/fs/btrfs/disk-io.h
@@ -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 @@
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
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index ebfd304..2cd957d 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -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 @@
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 @@
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 @@
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 @@
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 @@
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 @@
if (!wrapped) {
wrapped = 1;
last = search_start;
- data = BTRFS_BLOCK_GROUP_MIXED;
goto wrapped;
}
goto out;
@@ -299,7 +297,6 @@
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 @@
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 @@
}
}
}
- 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 @@
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 @@
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 @@
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 @@
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 @@
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 @@
}
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 @@
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 @@
if (!full_scan)
total_needed -= empty_size;
full_scan = 1;
- data = BTRFS_BLOCK_GROUP_MIXED;
} else
wrapped = 1;
}
@@ -1657,8 +1502,6 @@
goto check_failed;
error:
- btrfs_release_path(root, path);
- btrfs_free_path(path);
return ret;
}
/*
@@ -1689,6 +1532,13 @@
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 @@
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 @@
}
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 @@
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_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 @@
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 @@
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 @@
btrfs_super_total_bytes(&info->super_copy))
break;
}
-
+ ret = 0;
+error:
btrfs_free_path(path);
- return 0;
+ return ret;
}
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index e8130c8..7e3a1eb 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -1706,9 +1706,9 @@
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);
diff --git a/fs/btrfs/extent_io.h b/fs/btrfs/extent_io.h
index 9d66546..0dca893 100644
--- a/fs/btrfs/extent_io.h
+++ b/fs/btrfs/extent_io.h
@@ -28,7 +28,7 @@
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);
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 315dd55..17063cd 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -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 @@
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 @@
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 @@
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 @@
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 @@
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;
diff --git a/fs/btrfs/print-tree.c b/fs/btrfs/print-tree.c
index da0b4dc..9c1335d 100644
--- a/fs/btrfs/print-tree.c
+++ b/fs/btrfs/print-tree.c
@@ -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 @@
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 @@
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));
};
}
}
diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c
index e9a0983..5e9f692 100644
--- a/fs/btrfs/transaction.c
+++ b/fs/btrfs/transaction.c
@@ -198,29 +198,42 @@
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 @@
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 @@
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));
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
new file mode 100644
index 0000000..90a8d45
--- /dev/null
+++ b/fs/btrfs/volumes.c
@@ -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;
+}
+
diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h
new file mode 100644
index 0000000..4a47dcb
--- /dev/null
+++ b/fs/btrfs/volumes.h
@@ -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