extern struct kmem_cache *btrfs_path_cachep;
struct btrfs_ordered_sum;
-#define BTRFS_MAGIC "_BFRfS_M"
+#define BTRFS_MAGIC "_BHRfS_M"
#define BTRFS_ACL_NOT_CACHED ((void *)-1)
/* directory objectid inside the root tree */
#define BTRFS_ROOT_TREE_DIR_OBJECTID 6ULL
+/* holds checksums of all the data extents */
+#define BTRFS_CSUM_TREE_OBJECTID 7ULL
+
/* orhpan objectid for tracking unlinked/truncated files */
#define BTRFS_ORPHAN_OBJECTID -5ULL
#define BTRFS_TREE_RELOC_OBJECTID -8ULL
#define BTRFS_DATA_RELOC_TREE_OBJECTID -9ULL
+/*
+ * extent checksums all have this objectid
+ * this allows them to share the logging tree
+ * for fsyncs
+ */
+#define BTRFS_EXTENT_CSUM_OBJECTID -10ULL
+
/* dummy objectid represents multiple objectids */
#define BTRFS_MULTIPLE_OBJECTIDS -255ULL
static int btrfs_csum_sizes[] = { 4, 0 };
/* four bytes for CRC32 */
-//#define BTRFS_CRC32_SIZE 4
#define BTRFS_EMPTY_DIR_SIZE 0
#define BTRFS_FT_UNKNOWN 0
/* expected generation for this device */
__le64 generation;
+ /*
+ * starting byte of this partition on the device,
+ * to allowr for stripe alignment in the future
+ */
+ __le64 start_offset;
+
/* grouping information for allocation decisions */
__le32 dev_group;
} __attribute__ ((__packed__));
#define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->nodesize - \
- sizeof(struct btrfs_header)) / \
- sizeof(struct btrfs_key_ptr))
+ sizeof(struct btrfs_header)) / \
+ sizeof(struct btrfs_key_ptr))
#define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
#define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->leafsize))
#define BTRFS_MAX_INLINE_DATA_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
__le64 root;
__le64 chunk_root;
__le64 log_root;
+
+ /* this will help find the new super based on the log root */
+ __le64 log_root_transid;
__le64 total_bytes;
__le64 bytes_used;
__le64 root_dir_objectid;
u8 chunk_root_level;
u8 log_root_level;
struct btrfs_dev_item dev_item;
+
char label[BTRFS_LABEL_SIZE];
+
+ /* future expansion */
+ __le64 reserved[32];
u8 sys_chunk_array[BTRFS_SYSTEM_CHUNK_ARRAY_SIZE];
} __attribute__ ((__packed__));
int keep_locks;
int skip_locking;
int lowest_level;
+
+ /*
+ * set by btrfs_split_item, tells search_slot to keep all locks
+ * and to force calls to keep space in the nodes
+ */
+ int search_for_split;
};
/*
__le32 nsec;
} __attribute__ ((__packed__));
-typedef enum {
+enum btrfs_compression_type {
BTRFS_COMPRESS_NONE = 0,
BTRFS_COMPRESS_ZLIB = 1,
BTRFS_COMPRESS_LAST = 2,
-} btrfs_compression_type;
-
-/* we don't understand any encryption methods right now */
-typedef enum {
- BTRFS_ENCRYPTION_NONE = 0,
- BTRFS_ENCRYPTION_LAST = 1,
-} btrfs_encryption_type;
+};
struct btrfs_inode_item {
/* nfs style generation number */
__le64 rdev;
__le64 flags;
+ /* modification sequence number for NFS */
+ __le64 sequence;
+
+ /*
+ * a little future expansion, for more than this we can
+ * just grow the inode item and version it
+ */
+ __le64 reserved[4];
struct btrfs_timespec atime;
struct btrfs_timespec ctime;
struct btrfs_timespec mtime;
/* for block groups in the same raid type */
struct list_head list;
+
+ /* usage count */
+ atomic_t count;
};
struct btrfs_leaf_ref_tree {
struct btrfs_root *chunk_root;
struct btrfs_root *dev_root;
struct btrfs_root *fs_root;
+ struct btrfs_root *csum_root;
/* the log root tree is a directory of all the other log roots */
struct btrfs_root *log_root_tree;
struct btrfs_transaction *running_transaction;
wait_queue_head_t transaction_throttle;
wait_queue_head_t transaction_wait;
-
wait_queue_head_t async_submit_wait;
- wait_queue_head_t tree_log_wait;
struct btrfs_super_block super_copy;
struct btrfs_super_block super_for_commit;
struct super_block *sb;
struct inode *btree_inode;
struct backing_dev_info bdi;
- spinlock_t hash_lock;
struct mutex trans_mutex;
struct mutex tree_log_mutex;
struct mutex transaction_kthread_mutex;
atomic_t async_submit_draining;
atomic_t nr_async_bios;
atomic_t async_delalloc_pages;
- atomic_t tree_log_writers;
- atomic_t tree_log_commit;
- unsigned long tree_log_batch;
- u64 tree_log_transid;
/*
* this is used by the balancing code to wait for all the pending
struct btrfs_workers workers;
struct btrfs_workers delalloc_workers;
struct btrfs_workers endio_workers;
+ struct btrfs_workers endio_meta_workers;
+ struct btrfs_workers endio_meta_write_workers;
struct btrfs_workers endio_write_workers;
struct btrfs_workers submit_workers;
/*
struct kobject root_kobj;
struct completion kobj_unregister;
struct mutex objectid_mutex;
+
struct mutex log_mutex;
+ wait_queue_head_t log_writer_wait;
+ wait_queue_head_t log_commit_wait[2];
+ atomic_t log_writers;
+ atomic_t log_commit[2];
+ unsigned long log_transid;
+ unsigned long log_batch;
u64 objectid;
u64 last_trans;
* extent data is for file data
*/
#define BTRFS_EXTENT_DATA_KEY 108
+
/*
- * csum items have the checksums for data in the extents
+ * extent csums are stored in a separate tree and hold csums for
+ * an entire extent on disk.
*/
-#define BTRFS_CSUM_ITEM_KEY 120
-
-
-/* reserve 21-31 for other file/dir stuff */
+#define BTRFS_EXTENT_CSUM_KEY 128
/*
* root items point to tree roots. There are typically in the root
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_start_offset, struct btrfs_dev_item,
+ start_offset, 64);
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_group, struct btrfs_dev_item, dev_group, 32);
/* struct btrfs_inode_item */
BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
+BTRFS_SETGET_FUNCS(inode_sequence, struct btrfs_inode_item, sequence, 64);
BTRFS_SETGET_FUNCS(inode_transid, struct btrfs_inode_item, transid, 64);
BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
BTRFS_SETGET_FUNCS(inode_nbytes, struct btrfs_inode_item, nbytes, 64);
static inline int btrfs_is_leaf(struct extent_buffer *eb)
{
- return (btrfs_header_level(eb) == 0);
+ return btrfs_header_level(eb) == 0;
}
/* struct btrfs_root_item */
chunk_root_level, 8);
BTRFS_SETGET_STACK_FUNCS(super_log_root, struct btrfs_super_block,
log_root, 64);
+BTRFS_SETGET_STACK_FUNCS(super_log_root_transid, struct btrfs_super_block,
+ log_root_transid, 64);
BTRFS_SETGET_STACK_FUNCS(super_log_root_level, struct btrfs_super_block,
log_root_level, 8);
BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block,
/* struct btrfs_file_extent_item */
BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
-static inline unsigned long btrfs_file_extent_inline_start(struct
- btrfs_file_extent_item *e)
+static inline unsigned long
+btrfs_file_extent_inline_start(struct btrfs_file_extent_item *e)
{
unsigned long offset = (unsigned long)e;
offset += offsetof(struct btrfs_file_extent_item, disk_bytenr);
const char *name, int len)
{
/* if we already have a name just free it */
- if (root->name)
- kfree(root->name);
+ kfree(root->name);
root->name = kmalloc(len+1, GFP_KERNEL);
if (!root->name)
return -ENOMEM;
memcpy(root->name, name, len);
- root->name[len] ='\0';
+ root->name[len] = '\0';
return 0;
}
-static inline u32 btrfs_level_size(struct btrfs_root *root, int level) {
+static inline u32 btrfs_level_size(struct btrfs_root *root, int level)
+{
if (level == 0)
return root->leafsize;
return root->nodesize;
int btrfs_drop_leaf_ref(struct btrfs_trans_handle *trans,
struct btrfs_root *root, struct extent_buffer *leaf);
int btrfs_cross_ref_exist(struct btrfs_trans_handle *trans,
- struct btrfs_root *root, u64 bytenr);
+ struct btrfs_root *root, u64 objectid, u64 bytenr);
int btrfs_extent_post_op(struct btrfs_trans_handle *trans,
struct btrfs_root *root);
int btrfs_copy_pinned(struct btrfs_root *root, struct extent_io_tree *copy);
-struct btrfs_block_group_cache *btrfs_lookup_block_group(struct
- btrfs_fs_info *info,
- u64 bytenr);
-struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root,
- struct btrfs_block_group_cache
- *hint, u64 search_start,
- int data, int owner);
+struct btrfs_block_group_cache *btrfs_lookup_block_group(
+ struct btrfs_fs_info *info,
+ u64 bytenr);
+u64 btrfs_find_block_group(struct btrfs_root *root,
+ u64 search_start, u64 search_hint, int owner);
struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
u32 blocksize, u64 parent,
u64 owner_objectid);
int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
struct btrfs_root *root);
+int btrfs_extent_readonly(struct btrfs_root *root, u64 bytenr);
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 extent_buffer *buf, u64 orig_start);
int btrfs_add_dead_reloc_root(struct btrfs_root *root);
int btrfs_cleanup_reloc_trees(struct btrfs_root *root);
+int btrfs_reloc_clone_csums(struct inode *inode, u64 file_pos, u64 len);
u64 btrfs_reduce_alloc_profile(struct btrfs_root *root, u64 flags);
/* ctree.c */
int btrfs_previous_item(struct btrfs_root *root,
struct btrfs_root *root,
struct btrfs_path *path,
u32 new_size, int from_end);
+int btrfs_split_item(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct btrfs_path *path,
+ struct btrfs_key *new_key,
+ unsigned long split_offset);
int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
*root, struct btrfs_key *key, struct btrfs_path *p, int
ins_len, int cow);
struct btrfs_path *btrfs_alloc_path(void);
void btrfs_free_path(struct btrfs_path *p);
void btrfs_init_path(struct btrfs_path *p);
+void btrfs_set_path_blocking(struct btrfs_path *p);
+void btrfs_clear_path_blocking(struct btrfs_path *p);
+void btrfs_unlock_up_safe(struct btrfs_path *p, int level);
+
int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root,
struct btrfs_path *path, int slot, int nr);
int btrfs_del_leaf(struct btrfs_trans_handle *trans,
int btrfs_find_dead_roots(struct btrfs_root *root, u64 objectid,
struct btrfs_root *latest_root);
/* dir-item.c */
-int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
- *root, const char *name, int name_len, u64 dir,
+int btrfs_insert_dir_item(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, const char *name,
+ int name_len, u64 dir,
struct btrfs_key *location, u8 type, u64 index);
struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct btrfs_key *location, int mod);
/* file-item.c */
+int btrfs_del_csums(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, u64 bytenr, u64 len);
int btrfs_lookup_bio_sums(struct btrfs_root *root, struct inode *inode,
- struct bio *bio);
+ struct bio *bio, u32 *dst);
int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
u64 objectid, u64 pos,
struct btrfs_path *path, u64 objectid,
u64 bytenr, int mod);
int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans,
- struct btrfs_root *root, struct inode *inode,
+ struct btrfs_root *root,
struct btrfs_ordered_sum *sums);
int btrfs_csum_one_bio(struct btrfs_root *root, struct inode *inode,
- struct bio *bio);
+ struct bio *bio, u64 file_start, int contig);
int btrfs_csum_file_bytes(struct btrfs_root *root, struct inode *inode,
u64 start, unsigned long len);
struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct btrfs_path *path,
- u64 objectid, u64 offset,
- int cow);
+ u64 bytenr, int cow);
int btrfs_csum_truncate(struct btrfs_trans_handle *trans,
struct btrfs_root *root, struct btrfs_path *path,
u64 isize);
+int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start,
+ u64 end, struct list_head *list);
/* inode.c */
/* RHEL and EL kernels have a patch that renames PG_checked to FsMisc */
int btrfs_set_extent_delalloc(struct inode *inode, u64 start, u64 end);
int btrfs_writepages(struct address_space *mapping,
struct writeback_control *wbc);
-int btrfs_create_subvol_root(struct btrfs_root *new_root, struct dentry *dentry,
- struct btrfs_trans_handle *trans, u64 new_dirid,
- struct btrfs_block_group_cache *block_group);
-
+int btrfs_create_subvol_root(struct btrfs_trans_handle *trans,
+ struct btrfs_root *new_root, struct dentry *dentry,
+ u64 new_dirid, u64 alloc_hint);
int btrfs_merge_bio_hook(struct page *page, unsigned long offset,
size_t size, struct bio *bio, unsigned long bio_flags);
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