330 строки
11 KiB
C
330 строки
11 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
|
|
#ifndef BTRFS_EXTENT_IO_H
|
|
#define BTRFS_EXTENT_IO_H
|
|
|
|
#include <linux/rbtree.h>
|
|
#include <linux/refcount.h>
|
|
#include <linux/fiemap.h>
|
|
#include <linux/btrfs_tree.h>
|
|
#include "ulist.h"
|
|
|
|
/*
|
|
* flags for bio submission. The high bits indicate the compression
|
|
* type for this bio
|
|
*/
|
|
#define EXTENT_BIO_COMPRESSED 1
|
|
#define EXTENT_BIO_FLAG_SHIFT 16
|
|
|
|
enum {
|
|
EXTENT_BUFFER_UPTODATE,
|
|
EXTENT_BUFFER_DIRTY,
|
|
EXTENT_BUFFER_CORRUPT,
|
|
/* this got triggered by readahead */
|
|
EXTENT_BUFFER_READAHEAD,
|
|
EXTENT_BUFFER_TREE_REF,
|
|
EXTENT_BUFFER_STALE,
|
|
EXTENT_BUFFER_WRITEBACK,
|
|
/* read IO error */
|
|
EXTENT_BUFFER_READ_ERR,
|
|
EXTENT_BUFFER_UNMAPPED,
|
|
EXTENT_BUFFER_IN_TREE,
|
|
/* write IO error */
|
|
EXTENT_BUFFER_WRITE_ERR,
|
|
EXTENT_BUFFER_NO_CHECK,
|
|
};
|
|
|
|
/* these are flags for __process_pages_contig */
|
|
#define PAGE_UNLOCK (1 << 0)
|
|
/* Page starts writeback, clear dirty bit and set writeback bit */
|
|
#define PAGE_START_WRITEBACK (1 << 1)
|
|
#define PAGE_END_WRITEBACK (1 << 2)
|
|
#define PAGE_SET_ORDERED (1 << 3)
|
|
#define PAGE_SET_ERROR (1 << 4)
|
|
#define PAGE_LOCK (1 << 5)
|
|
|
|
/*
|
|
* page->private values. Every page that is controlled by the extent
|
|
* map has page->private set to one.
|
|
*/
|
|
#define EXTENT_PAGE_PRIVATE 1
|
|
|
|
/*
|
|
* The extent buffer bitmap operations are done with byte granularity instead of
|
|
* word granularity for two reasons:
|
|
* 1. The bitmaps must be little-endian on disk.
|
|
* 2. Bitmap items are not guaranteed to be aligned to a word and therefore a
|
|
* single word in a bitmap may straddle two pages in the extent buffer.
|
|
*/
|
|
#define BIT_BYTE(nr) ((nr) / BITS_PER_BYTE)
|
|
#define BYTE_MASK ((1 << BITS_PER_BYTE) - 1)
|
|
#define BITMAP_FIRST_BYTE_MASK(start) \
|
|
((BYTE_MASK << ((start) & (BITS_PER_BYTE - 1))) & BYTE_MASK)
|
|
#define BITMAP_LAST_BYTE_MASK(nbits) \
|
|
(BYTE_MASK >> (-(nbits) & (BITS_PER_BYTE - 1)))
|
|
|
|
struct btrfs_root;
|
|
struct btrfs_inode;
|
|
struct btrfs_io_bio;
|
|
struct btrfs_fs_info;
|
|
struct io_failure_record;
|
|
struct extent_io_tree;
|
|
|
|
typedef blk_status_t (submit_bio_hook_t)(struct inode *inode, struct bio *bio,
|
|
int mirror_num,
|
|
unsigned long bio_flags);
|
|
|
|
typedef blk_status_t (extent_submit_bio_start_t)(struct inode *inode,
|
|
struct bio *bio, u64 dio_file_offset);
|
|
|
|
#define INLINE_EXTENT_BUFFER_PAGES (BTRFS_MAX_METADATA_BLOCKSIZE / PAGE_SIZE)
|
|
struct extent_buffer {
|
|
u64 start;
|
|
unsigned long len;
|
|
unsigned long bflags;
|
|
struct btrfs_fs_info *fs_info;
|
|
spinlock_t refs_lock;
|
|
atomic_t refs;
|
|
atomic_t io_pages;
|
|
int read_mirror;
|
|
struct rcu_head rcu_head;
|
|
pid_t lock_owner;
|
|
/* >= 0 if eb belongs to a log tree, -1 otherwise */
|
|
s8 log_index;
|
|
|
|
struct rw_semaphore lock;
|
|
|
|
struct page *pages[INLINE_EXTENT_BUFFER_PAGES];
|
|
struct list_head release_list;
|
|
#ifdef CONFIG_BTRFS_DEBUG
|
|
struct list_head leak_list;
|
|
#endif
|
|
};
|
|
|
|
/*
|
|
* Structure to record info about the bio being assembled, and other info like
|
|
* how many bytes are there before stripe/ordered extent boundary.
|
|
*/
|
|
struct btrfs_bio_ctrl {
|
|
struct bio *bio;
|
|
unsigned long bio_flags;
|
|
u32 len_to_stripe_boundary;
|
|
u32 len_to_oe_boundary;
|
|
};
|
|
|
|
/*
|
|
* Structure to record how many bytes and which ranges are set/cleared
|
|
*/
|
|
struct extent_changeset {
|
|
/* How many bytes are set/cleared in this operation */
|
|
u64 bytes_changed;
|
|
|
|
/* Changed ranges */
|
|
struct ulist range_changed;
|
|
};
|
|
|
|
static inline void extent_changeset_init(struct extent_changeset *changeset)
|
|
{
|
|
changeset->bytes_changed = 0;
|
|
ulist_init(&changeset->range_changed);
|
|
}
|
|
|
|
static inline struct extent_changeset *extent_changeset_alloc(void)
|
|
{
|
|
struct extent_changeset *ret;
|
|
|
|
ret = kmalloc(sizeof(*ret), GFP_KERNEL);
|
|
if (!ret)
|
|
return NULL;
|
|
|
|
extent_changeset_init(ret);
|
|
return ret;
|
|
}
|
|
|
|
static inline void extent_changeset_release(struct extent_changeset *changeset)
|
|
{
|
|
if (!changeset)
|
|
return;
|
|
changeset->bytes_changed = 0;
|
|
ulist_release(&changeset->range_changed);
|
|
}
|
|
|
|
static inline void extent_changeset_free(struct extent_changeset *changeset)
|
|
{
|
|
if (!changeset)
|
|
return;
|
|
extent_changeset_release(changeset);
|
|
kfree(changeset);
|
|
}
|
|
|
|
static inline void extent_set_compress_type(unsigned long *bio_flags,
|
|
int compress_type)
|
|
{
|
|
*bio_flags |= compress_type << EXTENT_BIO_FLAG_SHIFT;
|
|
}
|
|
|
|
static inline int extent_compress_type(unsigned long bio_flags)
|
|
{
|
|
return bio_flags >> EXTENT_BIO_FLAG_SHIFT;
|
|
}
|
|
|
|
struct extent_map_tree;
|
|
|
|
typedef struct extent_map *(get_extent_t)(struct btrfs_inode *inode,
|
|
struct page *page, size_t pg_offset,
|
|
u64 start, u64 len);
|
|
|
|
int try_release_extent_mapping(struct page *page, gfp_t mask);
|
|
int try_release_extent_buffer(struct page *page);
|
|
|
|
int __must_check submit_one_bio(struct bio *bio, int mirror_num,
|
|
unsigned long bio_flags);
|
|
int btrfs_do_readpage(struct page *page, struct extent_map **em_cached,
|
|
struct btrfs_bio_ctrl *bio_ctrl,
|
|
unsigned int read_flags, u64 *prev_em_start);
|
|
int extent_write_full_page(struct page *page, struct writeback_control *wbc);
|
|
int extent_write_locked_range(struct inode *inode, u64 start, u64 end,
|
|
int mode);
|
|
int extent_writepages(struct address_space *mapping,
|
|
struct writeback_control *wbc);
|
|
int btree_write_cache_pages(struct address_space *mapping,
|
|
struct writeback_control *wbc);
|
|
void extent_readahead(struct readahead_control *rac);
|
|
int extent_fiemap(struct btrfs_inode *inode, struct fiemap_extent_info *fieinfo,
|
|
u64 start, u64 len);
|
|
int set_page_extent_mapped(struct page *page);
|
|
void clear_page_extent_mapped(struct page *page);
|
|
|
|
struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info,
|
|
u64 start, u64 owner_root, int level);
|
|
struct extent_buffer *__alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
|
|
u64 start, unsigned long len);
|
|
struct extent_buffer *alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
|
|
u64 start);
|
|
struct extent_buffer *btrfs_clone_extent_buffer(const struct extent_buffer *src);
|
|
struct extent_buffer *find_extent_buffer(struct btrfs_fs_info *fs_info,
|
|
u64 start);
|
|
void free_extent_buffer(struct extent_buffer *eb);
|
|
void free_extent_buffer_stale(struct extent_buffer *eb);
|
|
#define WAIT_NONE 0
|
|
#define WAIT_COMPLETE 1
|
|
#define WAIT_PAGE_LOCK 2
|
|
int read_extent_buffer_pages(struct extent_buffer *eb, int wait,
|
|
int mirror_num);
|
|
void wait_on_extent_buffer_writeback(struct extent_buffer *eb);
|
|
void btrfs_readahead_tree_block(struct btrfs_fs_info *fs_info,
|
|
u64 bytenr, u64 owner_root, u64 gen, int level);
|
|
void btrfs_readahead_node_child(struct extent_buffer *node, int slot);
|
|
|
|
static inline int num_extent_pages(const struct extent_buffer *eb)
|
|
{
|
|
/*
|
|
* For sectorsize == PAGE_SIZE case, since nodesize is always aligned to
|
|
* sectorsize, it's just eb->len >> PAGE_SHIFT.
|
|
*
|
|
* For sectorsize < PAGE_SIZE case, we could have nodesize < PAGE_SIZE,
|
|
* thus have to ensure we get at least one page.
|
|
*/
|
|
return (eb->len >> PAGE_SHIFT) ?: 1;
|
|
}
|
|
|
|
static inline int extent_buffer_uptodate(const struct extent_buffer *eb)
|
|
{
|
|
return test_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags);
|
|
}
|
|
|
|
int memcmp_extent_buffer(const struct extent_buffer *eb, const void *ptrv,
|
|
unsigned long start, unsigned long len);
|
|
void read_extent_buffer(const struct extent_buffer *eb, void *dst,
|
|
unsigned long start,
|
|
unsigned long len);
|
|
int read_extent_buffer_to_user_nofault(const struct extent_buffer *eb,
|
|
void __user *dst, unsigned long start,
|
|
unsigned long len);
|
|
void write_extent_buffer_fsid(const struct extent_buffer *eb, const void *src);
|
|
void write_extent_buffer_chunk_tree_uuid(const struct extent_buffer *eb,
|
|
const void *src);
|
|
void write_extent_buffer(const struct extent_buffer *eb, const void *src,
|
|
unsigned long start, unsigned long len);
|
|
void copy_extent_buffer_full(const struct extent_buffer *dst,
|
|
const struct extent_buffer *src);
|
|
void copy_extent_buffer(const struct extent_buffer *dst,
|
|
const struct extent_buffer *src,
|
|
unsigned long dst_offset, unsigned long src_offset,
|
|
unsigned long len);
|
|
void memcpy_extent_buffer(const struct extent_buffer *dst,
|
|
unsigned long dst_offset, unsigned long src_offset,
|
|
unsigned long len);
|
|
void memmove_extent_buffer(const struct extent_buffer *dst,
|
|
unsigned long dst_offset, unsigned long src_offset,
|
|
unsigned long len);
|
|
void memzero_extent_buffer(const struct extent_buffer *eb, unsigned long start,
|
|
unsigned long len);
|
|
int extent_buffer_test_bit(const struct extent_buffer *eb, unsigned long start,
|
|
unsigned long pos);
|
|
void extent_buffer_bitmap_set(const struct extent_buffer *eb, unsigned long start,
|
|
unsigned long pos, unsigned long len);
|
|
void extent_buffer_bitmap_clear(const struct extent_buffer *eb,
|
|
unsigned long start, unsigned long pos,
|
|
unsigned long len);
|
|
void clear_extent_buffer_dirty(const struct extent_buffer *eb);
|
|
bool set_extent_buffer_dirty(struct extent_buffer *eb);
|
|
void set_extent_buffer_uptodate(struct extent_buffer *eb);
|
|
void clear_extent_buffer_uptodate(struct extent_buffer *eb);
|
|
int extent_buffer_under_io(const struct extent_buffer *eb);
|
|
void extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end);
|
|
void extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end);
|
|
void extent_clear_unlock_delalloc(struct btrfs_inode *inode, u64 start, u64 end,
|
|
struct page *locked_page,
|
|
u32 bits_to_clear, unsigned long page_ops);
|
|
struct bio *btrfs_bio_alloc(u64 first_byte);
|
|
struct bio *btrfs_io_bio_alloc(unsigned int nr_iovecs);
|
|
struct bio *btrfs_bio_clone(struct bio *bio);
|
|
struct bio *btrfs_bio_clone_partial(struct bio *orig, u64 offset, u64 size);
|
|
|
|
int repair_io_failure(struct btrfs_fs_info *fs_info, u64 ino, u64 start,
|
|
u64 length, u64 logical, struct page *page,
|
|
unsigned int pg_offset, int mirror_num);
|
|
void end_extent_writepage(struct page *page, int err, u64 start, u64 end);
|
|
int btrfs_repair_eb_io_failure(const struct extent_buffer *eb, int mirror_num);
|
|
|
|
/*
|
|
* When IO fails, either with EIO or csum verification fails, we
|
|
* try other mirrors that might have a good copy of the data. This
|
|
* io_failure_record is used to record state as we go through all the
|
|
* mirrors. If another mirror has good data, the sector is set up to date
|
|
* and things continue. If a good mirror can't be found, the original
|
|
* bio end_io callback is called to indicate things have failed.
|
|
*/
|
|
struct io_failure_record {
|
|
struct page *page;
|
|
u64 start;
|
|
u64 len;
|
|
u64 logical;
|
|
unsigned long bio_flags;
|
|
int this_mirror;
|
|
int failed_mirror;
|
|
};
|
|
|
|
int btrfs_repair_one_sector(struct inode *inode,
|
|
struct bio *failed_bio, u32 bio_offset,
|
|
struct page *page, unsigned int pgoff,
|
|
u64 start, int failed_mirror,
|
|
submit_bio_hook_t *submit_bio_hook);
|
|
|
|
#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
|
|
bool find_lock_delalloc_range(struct inode *inode,
|
|
struct page *locked_page, u64 *start,
|
|
u64 *end);
|
|
#endif
|
|
struct extent_buffer *alloc_test_extent_buffer(struct btrfs_fs_info *fs_info,
|
|
u64 start);
|
|
|
|
#ifdef CONFIG_BTRFS_DEBUG
|
|
void btrfs_extent_buffer_leak_debug_check(struct btrfs_fs_info *fs_info);
|
|
#else
|
|
#define btrfs_extent_buffer_leak_debug_check(fs_info) do {} while (0)
|
|
#endif
|
|
|
|
#endif
|