331 lines
11 KiB
C
331 lines
11 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef BTRFS_EXTENT_IO_H
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#define BTRFS_EXTENT_IO_H
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#include <linux/rbtree.h>
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#include <linux/refcount.h>
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#include "ulist.h"
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/*
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* flags for bio submission. The high bits indicate the compression
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* type for this bio
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*/
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#define EXTENT_BIO_COMPRESSED 1
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#define EXTENT_BIO_FLAG_SHIFT 16
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enum {
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EXTENT_BUFFER_UPTODATE,
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EXTENT_BUFFER_DIRTY,
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EXTENT_BUFFER_CORRUPT,
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/* this got triggered by readahead */
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EXTENT_BUFFER_READAHEAD,
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EXTENT_BUFFER_TREE_REF,
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EXTENT_BUFFER_STALE,
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EXTENT_BUFFER_WRITEBACK,
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/* read IO error */
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EXTENT_BUFFER_READ_ERR,
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EXTENT_BUFFER_UNMAPPED,
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EXTENT_BUFFER_IN_TREE,
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/* write IO error */
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EXTENT_BUFFER_WRITE_ERR,
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};
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/* these are flags for __process_pages_contig */
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#define PAGE_UNLOCK (1 << 0)
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#define PAGE_CLEAR_DIRTY (1 << 1)
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#define PAGE_SET_WRITEBACK (1 << 2)
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#define PAGE_END_WRITEBACK (1 << 3)
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#define PAGE_SET_PRIVATE2 (1 << 4)
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#define PAGE_SET_ERROR (1 << 5)
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#define PAGE_LOCK (1 << 6)
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/*
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* page->private values. Every page that is controlled by the extent
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* map has page->private set to one.
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*/
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#define EXTENT_PAGE_PRIVATE 1
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/*
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* The extent buffer bitmap operations are done with byte granularity instead of
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* word granularity for two reasons:
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* 1. The bitmaps must be little-endian on disk.
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* 2. Bitmap items are not guaranteed to be aligned to a word and therefore a
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* single word in a bitmap may straddle two pages in the extent buffer.
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*/
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#define BIT_BYTE(nr) ((nr) / BITS_PER_BYTE)
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#define BYTE_MASK ((1 << BITS_PER_BYTE) - 1)
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#define BITMAP_FIRST_BYTE_MASK(start) \
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((BYTE_MASK << ((start) & (BITS_PER_BYTE - 1))) & BYTE_MASK)
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#define BITMAP_LAST_BYTE_MASK(nbits) \
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(BYTE_MASK >> (-(nbits) & (BITS_PER_BYTE - 1)))
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struct btrfs_root;
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struct btrfs_inode;
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struct btrfs_io_bio;
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struct io_failure_record;
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struct extent_io_tree;
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typedef blk_status_t (extent_submit_bio_start_t)(void *private_data,
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struct bio *bio, u64 bio_offset);
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struct extent_io_ops {
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/*
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* The following callbacks must be always defined, the function
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* pointer will be called unconditionally.
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*/
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blk_status_t (*submit_bio_hook)(struct inode *inode, struct bio *bio,
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int mirror_num, unsigned long bio_flags);
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int (*readpage_end_io_hook)(struct btrfs_io_bio *io_bio, u64 phy_offset,
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struct page *page, u64 start, u64 end,
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int mirror);
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};
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#define INLINE_EXTENT_BUFFER_PAGES 16
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#define MAX_INLINE_EXTENT_BUFFER_SIZE (INLINE_EXTENT_BUFFER_PAGES * PAGE_SIZE)
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struct extent_buffer {
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u64 start;
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unsigned long len;
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unsigned long bflags;
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struct btrfs_fs_info *fs_info;
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spinlock_t refs_lock;
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atomic_t refs;
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atomic_t io_pages;
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int read_mirror;
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struct rcu_head rcu_head;
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pid_t lock_owner;
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int blocking_writers;
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atomic_t blocking_readers;
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bool lock_nested;
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/* >= 0 if eb belongs to a log tree, -1 otherwise */
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short log_index;
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/* protects write locks */
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rwlock_t lock;
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/* readers use lock_wq while they wait for the write
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* lock holders to unlock
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*/
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wait_queue_head_t write_lock_wq;
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/* writers use read_lock_wq while they wait for readers
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* to unlock
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*/
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wait_queue_head_t read_lock_wq;
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struct page *pages[INLINE_EXTENT_BUFFER_PAGES];
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#ifdef CONFIG_BTRFS_DEBUG
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int spinning_writers;
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atomic_t spinning_readers;
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atomic_t read_locks;
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int write_locks;
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struct list_head leak_list;
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#endif
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};
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/*
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* Structure to record how many bytes and which ranges are set/cleared
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*/
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struct extent_changeset {
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/* How many bytes are set/cleared in this operation */
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unsigned int bytes_changed;
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/* Changed ranges */
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struct ulist range_changed;
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};
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static inline void extent_changeset_init(struct extent_changeset *changeset)
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{
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changeset->bytes_changed = 0;
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ulist_init(&changeset->range_changed);
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}
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static inline struct extent_changeset *extent_changeset_alloc(void)
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{
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struct extent_changeset *ret;
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ret = kmalloc(sizeof(*ret), GFP_KERNEL);
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if (!ret)
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return NULL;
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extent_changeset_init(ret);
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return ret;
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}
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static inline void extent_changeset_release(struct extent_changeset *changeset)
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{
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if (!changeset)
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return;
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changeset->bytes_changed = 0;
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ulist_release(&changeset->range_changed);
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}
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static inline void extent_changeset_free(struct extent_changeset *changeset)
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{
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if (!changeset)
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return;
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extent_changeset_release(changeset);
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kfree(changeset);
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}
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static inline void extent_set_compress_type(unsigned long *bio_flags,
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int compress_type)
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{
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*bio_flags |= compress_type << EXTENT_BIO_FLAG_SHIFT;
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}
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static inline int extent_compress_type(unsigned long bio_flags)
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{
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return bio_flags >> EXTENT_BIO_FLAG_SHIFT;
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}
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struct extent_map_tree;
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typedef struct extent_map *(get_extent_t)(struct btrfs_inode *inode,
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struct page *page,
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size_t pg_offset,
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u64 start, u64 len,
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int create);
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int try_release_extent_mapping(struct page *page, gfp_t mask);
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int try_release_extent_buffer(struct page *page);
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int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
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get_extent_t *get_extent, int mirror_num);
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int extent_write_full_page(struct page *page, struct writeback_control *wbc);
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int extent_write_locked_range(struct inode *inode, u64 start, u64 end,
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int mode);
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int extent_writepages(struct address_space *mapping,
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struct writeback_control *wbc);
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int btree_write_cache_pages(struct address_space *mapping,
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struct writeback_control *wbc);
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int extent_readpages(struct address_space *mapping, struct list_head *pages,
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unsigned nr_pages);
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int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
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__u64 start, __u64 len);
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void set_page_extent_mapped(struct page *page);
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struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info,
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u64 start);
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struct extent_buffer *__alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
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u64 start, unsigned long len);
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struct extent_buffer *alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
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u64 start);
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struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src);
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struct extent_buffer *find_extent_buffer(struct btrfs_fs_info *fs_info,
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u64 start);
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void free_extent_buffer(struct extent_buffer *eb);
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void free_extent_buffer_stale(struct extent_buffer *eb);
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#define WAIT_NONE 0
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#define WAIT_COMPLETE 1
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#define WAIT_PAGE_LOCK 2
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int read_extent_buffer_pages(struct extent_buffer *eb, int wait,
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int mirror_num);
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void wait_on_extent_buffer_writeback(struct extent_buffer *eb);
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static inline int num_extent_pages(const struct extent_buffer *eb)
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{
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return (round_up(eb->start + eb->len, PAGE_SIZE) >> PAGE_SHIFT) -
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(eb->start >> PAGE_SHIFT);
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}
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static inline int extent_buffer_uptodate(struct extent_buffer *eb)
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{
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return test_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags);
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}
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int memcmp_extent_buffer(const struct extent_buffer *eb, const void *ptrv,
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unsigned long start, unsigned long len);
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void read_extent_buffer(const struct extent_buffer *eb, void *dst,
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unsigned long start,
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unsigned long len);
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int read_extent_buffer_to_user(const struct extent_buffer *eb,
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void __user *dst, unsigned long start,
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unsigned long len);
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void write_extent_buffer_fsid(struct extent_buffer *eb, const void *src);
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void write_extent_buffer_chunk_tree_uuid(struct extent_buffer *eb,
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const void *src);
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void write_extent_buffer(struct extent_buffer *eb, const void *src,
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unsigned long start, unsigned long len);
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void copy_extent_buffer_full(struct extent_buffer *dst,
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struct extent_buffer *src);
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void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
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unsigned long dst_offset, unsigned long src_offset,
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unsigned long len);
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void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
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unsigned long src_offset, unsigned long len);
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void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
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unsigned long src_offset, unsigned long len);
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void memzero_extent_buffer(struct extent_buffer *eb, unsigned long start,
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unsigned long len);
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int extent_buffer_test_bit(struct extent_buffer *eb, unsigned long start,
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unsigned long pos);
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void extent_buffer_bitmap_set(struct extent_buffer *eb, unsigned long start,
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unsigned long pos, unsigned long len);
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void extent_buffer_bitmap_clear(struct extent_buffer *eb, unsigned long start,
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unsigned long pos, unsigned long len);
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void clear_extent_buffer_dirty(struct extent_buffer *eb);
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bool set_extent_buffer_dirty(struct extent_buffer *eb);
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void set_extent_buffer_uptodate(struct extent_buffer *eb);
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void clear_extent_buffer_uptodate(struct extent_buffer *eb);
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int extent_buffer_under_io(struct extent_buffer *eb);
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int map_private_extent_buffer(const struct extent_buffer *eb,
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unsigned long offset, unsigned long min_len,
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char **map, unsigned long *map_start,
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unsigned long *map_len);
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void extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end);
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void extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end);
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void extent_clear_unlock_delalloc(struct inode *inode, u64 start, u64 end,
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struct page *locked_page,
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unsigned bits_to_clear,
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unsigned long page_ops);
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struct bio *btrfs_bio_alloc(u64 first_byte);
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struct bio *btrfs_io_bio_alloc(unsigned int nr_iovecs);
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struct bio *btrfs_bio_clone(struct bio *bio);
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struct bio *btrfs_bio_clone_partial(struct bio *orig, int offset, int size);
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struct btrfs_fs_info;
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struct btrfs_inode;
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int repair_io_failure(struct btrfs_fs_info *fs_info, u64 ino, u64 start,
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u64 length, u64 logical, struct page *page,
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unsigned int pg_offset, int mirror_num);
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void end_extent_writepage(struct page *page, int err, u64 start, u64 end);
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int btrfs_repair_eb_io_failure(struct extent_buffer *eb, int mirror_num);
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/*
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* When IO fails, either with EIO or csum verification fails, we
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* try other mirrors that might have a good copy of the data. This
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* io_failure_record is used to record state as we go through all the
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* mirrors. If another mirror has good data, the page is set up to date
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* and things continue. If a good mirror can't be found, the original
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* bio end_io callback is called to indicate things have failed.
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*/
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struct io_failure_record {
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struct page *page;
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u64 start;
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u64 len;
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u64 logical;
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unsigned long bio_flags;
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int this_mirror;
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int failed_mirror;
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int in_validation;
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};
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bool btrfs_check_repairable(struct inode *inode, unsigned failed_bio_pages,
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struct io_failure_record *failrec, int fail_mirror);
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struct bio *btrfs_create_repair_bio(struct inode *inode, struct bio *failed_bio,
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struct io_failure_record *failrec,
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struct page *page, int pg_offset, int icsum,
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bio_end_io_t *endio_func, void *data);
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#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
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bool find_lock_delalloc_range(struct inode *inode,
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struct page *locked_page, u64 *start,
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u64 *end);
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#endif
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struct extent_buffer *alloc_test_extent_buffer(struct btrfs_fs_info *fs_info,
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u64 start);
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#endif
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