e8c9f18603
There are some op tables that can be easily made const, similarly the sysfs feature and raid tables. This is motivated by PaX CONSTIFY plugin. Signed-off-by: David Sterba <dsterba@suse.cz>
382 lines
14 KiB
C
382 lines
14 KiB
C
#ifndef __EXTENTIO__
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#define __EXTENTIO__
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#include <linux/rbtree.h>
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/* bits for the extent state */
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#define EXTENT_DIRTY (1U << 0)
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#define EXTENT_WRITEBACK (1U << 1)
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#define EXTENT_UPTODATE (1U << 2)
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#define EXTENT_LOCKED (1U << 3)
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#define EXTENT_NEW (1U << 4)
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#define EXTENT_DELALLOC (1U << 5)
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#define EXTENT_DEFRAG (1U << 6)
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#define EXTENT_BOUNDARY (1U << 9)
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#define EXTENT_NODATASUM (1U << 10)
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#define EXTENT_DO_ACCOUNTING (1U << 11)
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#define EXTENT_FIRST_DELALLOC (1U << 12)
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#define EXTENT_NEED_WAIT (1U << 13)
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#define EXTENT_DAMAGED (1U << 14)
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#define EXTENT_NORESERVE (1U << 15)
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#define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
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#define EXTENT_CTLBITS (EXTENT_DO_ACCOUNTING | EXTENT_FIRST_DELALLOC)
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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_TREE_LOG 2
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#define EXTENT_BIO_PARENT_LOCKED 4
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#define EXTENT_BIO_FLAG_SHIFT 16
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/* these are bit numbers for test/set bit */
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#define EXTENT_BUFFER_UPTODATE 0
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#define EXTENT_BUFFER_DIRTY 2
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#define EXTENT_BUFFER_CORRUPT 3
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#define EXTENT_BUFFER_READAHEAD 4 /* this got triggered by readahead */
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#define EXTENT_BUFFER_TREE_REF 5
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#define EXTENT_BUFFER_STALE 6
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#define EXTENT_BUFFER_WRITEBACK 7
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#define EXTENT_BUFFER_READ_ERR 8 /* read IO error */
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#define EXTENT_BUFFER_DUMMY 9
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#define EXTENT_BUFFER_IN_TREE 10
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#define EXTENT_BUFFER_WRITE_ERR 11 /* write IO error */
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/* these are flags for extent_clear_unlock_delalloc */
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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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/*
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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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struct extent_state;
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struct btrfs_root;
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struct btrfs_io_bio;
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typedef int (extent_submit_bio_hook_t)(struct inode *inode, int rw,
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struct bio *bio, int mirror_num,
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unsigned long bio_flags, u64 bio_offset);
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struct extent_io_ops {
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int (*fill_delalloc)(struct inode *inode, struct page *locked_page,
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u64 start, u64 end, int *page_started,
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unsigned long *nr_written);
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int (*writepage_start_hook)(struct page *page, u64 start, u64 end);
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int (*writepage_io_hook)(struct page *page, u64 start, u64 end);
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extent_submit_bio_hook_t *submit_bio_hook;
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int (*merge_bio_hook)(int rw, struct page *page, unsigned long offset,
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size_t size, struct bio *bio,
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unsigned long bio_flags);
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int (*readpage_io_failed_hook)(struct page *page, int failed_mirror);
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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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int (*writepage_end_io_hook)(struct page *page, u64 start, u64 end,
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struct extent_state *state, int uptodate);
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void (*set_bit_hook)(struct inode *inode, struct extent_state *state,
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unsigned *bits);
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void (*clear_bit_hook)(struct inode *inode, struct extent_state *state,
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unsigned *bits);
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void (*merge_extent_hook)(struct inode *inode,
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struct extent_state *new,
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struct extent_state *other);
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void (*split_extent_hook)(struct inode *inode,
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struct extent_state *orig, u64 split);
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};
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struct extent_io_tree {
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struct rb_root state;
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struct address_space *mapping;
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u64 dirty_bytes;
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int track_uptodate;
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spinlock_t lock;
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const struct extent_io_ops *ops;
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};
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struct extent_state {
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u64 start;
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u64 end; /* inclusive */
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struct rb_node rb_node;
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/* ADD NEW ELEMENTS AFTER THIS */
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wait_queue_head_t wq;
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atomic_t refs;
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unsigned state;
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/* for use by the FS */
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u64 private;
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#ifdef CONFIG_BTRFS_DEBUG
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struct list_head leak_list;
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#endif
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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_CACHE_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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/* count of read lock holders on the extent buffer */
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atomic_t write_locks;
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atomic_t read_locks;
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atomic_t blocking_writers;
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atomic_t blocking_readers;
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atomic_t spinning_readers;
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atomic_t spinning_writers;
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short 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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struct list_head leak_list;
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#endif
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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 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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void extent_io_tree_init(struct extent_io_tree *tree,
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struct address_space *mapping);
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int try_release_extent_mapping(struct extent_map_tree *map,
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struct extent_io_tree *tree, struct page *page,
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gfp_t mask);
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int try_release_extent_buffer(struct page *page);
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int lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
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int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
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unsigned bits, struct extent_state **cached);
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int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end);
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int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end,
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struct extent_state **cached, gfp_t mask);
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int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
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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_read_full_page_nolock(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 __init extent_io_init(void);
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void extent_io_exit(void);
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u64 count_range_bits(struct extent_io_tree *tree,
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u64 *start, u64 search_end,
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u64 max_bytes, unsigned bits, int contig);
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void free_extent_state(struct extent_state *state);
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int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
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unsigned bits, int filled,
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struct extent_state *cached_state);
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int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
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unsigned bits, gfp_t mask);
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int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
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unsigned bits, int wake, int delete,
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struct extent_state **cached, gfp_t mask);
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int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
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unsigned bits, gfp_t mask);
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int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
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unsigned bits, u64 *failed_start,
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struct extent_state **cached_state, gfp_t mask);
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int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
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struct extent_state **cached_state, gfp_t mask);
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int clear_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
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struct extent_state **cached_state, gfp_t mask);
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int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
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gfp_t mask);
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int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
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gfp_t mask);
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int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
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gfp_t mask);
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int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
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unsigned bits, unsigned clear_bits,
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struct extent_state **cached_state, gfp_t mask);
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int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
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struct extent_state **cached_state, gfp_t mask);
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int set_extent_defrag(struct extent_io_tree *tree, u64 start, u64 end,
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struct extent_state **cached_state, gfp_t mask);
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int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
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u64 *start_ret, u64 *end_ret, unsigned bits,
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struct extent_state **cached_state);
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int extent_invalidatepage(struct extent_io_tree *tree,
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struct page *page, unsigned long offset);
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int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
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get_extent_t *get_extent,
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struct writeback_control *wbc);
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int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode,
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u64 start, u64 end, get_extent_t *get_extent,
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int mode);
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int extent_writepages(struct extent_io_tree *tree,
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struct address_space *mapping,
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get_extent_t *get_extent,
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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 extent_io_tree *tree,
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struct address_space *mapping,
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struct list_head *pages, unsigned nr_pages,
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get_extent_t get_extent);
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int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
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__u64 start, __u64 len, get_extent_t *get_extent);
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int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private);
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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);
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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_io_tree *tree,
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struct extent_buffer *eb, u64 start, int wait,
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get_extent_t *get_extent, int mirror_num);
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void wait_on_extent_buffer_writeback(struct extent_buffer *eb);
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static inline unsigned long num_extent_pages(u64 start, u64 len)
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{
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return ((start + len + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT) -
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(start >> PAGE_CACHE_SHIFT);
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}
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static inline void extent_buffer_get(struct extent_buffer *eb)
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{
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atomic_inc(&eb->refs);
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}
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int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
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unsigned long start,
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unsigned long len);
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void read_extent_buffer(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(struct extent_buffer *eb, void __user *dst,
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unsigned long start,
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unsigned long len);
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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(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 memset_extent_buffer(struct extent_buffer *eb, char c,
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unsigned long start, unsigned long len);
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void clear_extent_buffer_dirty(struct extent_buffer *eb);
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int set_extent_buffer_dirty(struct extent_buffer *eb);
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int set_extent_buffer_uptodate(struct extent_buffer *eb);
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int clear_extent_buffer_uptodate(struct extent_buffer *eb);
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int 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(struct extent_buffer *eb, unsigned long offset,
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unsigned long min_len, char **map,
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unsigned long *map_start,
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unsigned long *map_len);
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int extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end);
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int extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end);
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int 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 *
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btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs,
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gfp_t gfp_flags);
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struct bio *btrfs_io_bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs);
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struct bio *btrfs_bio_clone(struct bio *bio, gfp_t gfp_mask);
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struct btrfs_fs_info;
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int repair_io_failure(struct inode *inode, u64 start, u64 length, u64 logical,
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struct page *page, unsigned int pg_offset,
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int mirror_num);
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int clean_io_failure(struct inode *inode, u64 start, struct page *page,
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unsigned int pg_offset);
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int end_extent_writepage(struct page *page, int err, u64 start, u64 end);
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int repair_eb_io_failure(struct btrfs_root *root, struct extent_buffer *eb,
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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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void btrfs_free_io_failure_record(struct inode *inode, u64 start, u64 end);
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int btrfs_get_io_failure_record(struct inode *inode, u64 start, u64 end,
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struct io_failure_record **failrec_ret);
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int btrfs_check_repairable(struct inode *inode, struct bio *failed_bio,
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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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int free_io_failure(struct inode *inode, struct io_failure_record *rec);
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#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
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noinline u64 find_lock_delalloc_range(struct inode *inode,
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struct extent_io_tree *tree,
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struct page *locked_page, u64 *start,
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u64 *end, u64 max_bytes);
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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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