forked from Minki/linux
179e29e488
The fixes do a number of things: 1) Most btrfs_drop_extent callers will try to leave the inline extents in place. It can truncate bytes off the beginning of the inline extent if required. 2) writepage can now update the inline extent, allowing mmap writes to go directly into the inline extent. 3) btrfs_truncate_in_transaction truncates inline extents 4) extent_map.c fixed to not merge inline extent mappings and hole mappings together Signed-off-by: Chris Mason <chris.mason@oracle.com>
205 lines
7.3 KiB
C
205 lines
7.3 KiB
C
#ifndef __EXTENTMAP__
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#define __EXTENTMAP__
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#include <linux/rbtree.h>
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#define EXTENT_MAP_HOLE (u64)-3
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#define EXTENT_MAP_INLINE (u64)-2
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#define EXTENT_MAP_DELALLOC (u64)-1
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/* bits for the extent state */
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#define EXTENT_DIRTY 1
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#define EXTENT_WRITEBACK (1 << 1)
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#define EXTENT_UPTODATE (1 << 2)
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#define EXTENT_LOCKED (1 << 3)
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#define EXTENT_NEW (1 << 4)
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#define EXTENT_DELALLOC (1 << 5)
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#define EXTENT_DEFRAG (1 << 6)
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#define EXTENT_DEFRAG_DONE (1 << 7)
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#define EXTENT_BUFFER_FILLED (1 << 8)
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#define EXTENT_CSUM (1 << 9)
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#define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
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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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#define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3
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struct extent_map_ops {
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int (*fill_delalloc)(struct inode *inode, u64 start, u64 end);
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int (*writepage_io_hook)(struct page *page, u64 start, u64 end);
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int (*readpage_io_hook)(struct page *page, u64 start, u64 end);
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int (*readpage_end_io_hook)(struct page *page, u64 start, u64 end);
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void (*writepage_end_io_hook)(struct page *page, u64 start, u64 end);
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};
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struct extent_map_tree {
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struct rb_root map;
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struct rb_root state;
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struct address_space *mapping;
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rwlock_t lock;
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struct extent_map_ops *ops;
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spinlock_t lru_lock;
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struct list_head buffer_lru;
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int lru_size;
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};
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/* note, this must start with the same fields as fs/extent_map.c:tree_entry */
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struct extent_map {
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u64 start;
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u64 end; /* inclusive */
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int in_tree;
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struct rb_node rb_node;
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/* block_start and block_end are in bytes */
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u64 block_start;
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u64 block_end; /* inclusive */
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struct block_device *bdev;
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atomic_t refs;
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};
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/* note, this must start with the same fields as fs/extent_map.c:tree_entry */
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struct extent_state {
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u64 start;
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u64 end; /* inclusive */
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int in_tree;
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struct rb_node rb_node;
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wait_queue_head_t wq;
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atomic_t refs;
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unsigned long state;
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/* for use by the FS */
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u64 private;
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struct list_head list;
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};
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struct extent_buffer {
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u64 start;
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unsigned long len;
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char *map_token;
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char *kaddr;
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unsigned long map_start;
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unsigned long map_len;
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struct page *first_page;
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struct list_head lru;
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atomic_t refs;
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int flags;
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};
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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 page_offset,
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u64 start, u64 end,
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int create);
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void extent_map_tree_init(struct extent_map_tree *tree,
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struct address_space *mapping, gfp_t mask);
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void extent_map_tree_empty_lru(struct extent_map_tree *tree);
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struct extent_map *lookup_extent_mapping(struct extent_map_tree *tree,
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u64 start, u64 end);
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int add_extent_mapping(struct extent_map_tree *tree,
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struct extent_map *em);
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int remove_extent_mapping(struct extent_map_tree *tree, struct extent_map *em);
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int try_release_extent_mapping(struct extent_map_tree *tree, struct page *page);
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int lock_extent(struct extent_map_tree *tree, u64 start, u64 end, gfp_t mask);
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int unlock_extent(struct extent_map_tree *tree, u64 start, u64 end, gfp_t mask);
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struct extent_map *alloc_extent_map(gfp_t mask);
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void free_extent_map(struct extent_map *em);
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int extent_read_full_page(struct extent_map_tree *tree, struct page *page,
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get_extent_t *get_extent);
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void __init extent_map_init(void);
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void __exit extent_map_exit(void);
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int test_range_bit(struct extent_map_tree *tree, u64 start, u64 end,
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int bits, int filled);
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int clear_extent_bits(struct extent_map_tree *tree, u64 start, u64 end,
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int bits, gfp_t mask);
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int set_extent_bits(struct extent_map_tree *tree, u64 start, u64 end,
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int bits, gfp_t mask);
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int set_extent_uptodate(struct extent_map_tree *tree, u64 start, u64 end,
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gfp_t mask);
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int set_extent_new(struct extent_map_tree *tree, u64 start, u64 end,
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gfp_t mask);
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int set_extent_dirty(struct extent_map_tree *tree, u64 start, u64 end,
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gfp_t mask);
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int clear_extent_dirty(struct extent_map_tree *tree, u64 start, u64 end,
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gfp_t mask);
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int set_extent_delalloc(struct extent_map_tree *tree, u64 start, u64 end,
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gfp_t mask);
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int find_first_extent_bit(struct extent_map_tree *tree, u64 start,
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u64 *start_ret, u64 *end_ret, int bits);
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int extent_invalidatepage(struct extent_map_tree *tree,
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struct page *page, unsigned long offset);
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int extent_write_full_page(struct extent_map_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_prepare_write(struct extent_map_tree *tree,
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struct inode *inode, struct page *page,
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unsigned from, unsigned to, get_extent_t *get_extent);
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int extent_commit_write(struct extent_map_tree *tree,
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struct inode *inode, struct page *page,
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unsigned from, unsigned to);
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sector_t extent_bmap(struct address_space *mapping, sector_t iblock,
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get_extent_t *get_extent);
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int set_range_dirty(struct extent_map_tree *tree, u64 start, u64 end);
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int set_state_private(struct extent_map_tree *tree, u64 start, u64 private);
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int get_state_private(struct extent_map_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 extent_map_tree *tree,
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u64 start, unsigned long len,
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struct page *page0,
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gfp_t mask);
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struct extent_buffer *find_extent_buffer(struct extent_map_tree *tree,
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u64 start, unsigned long len,
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gfp_t mask);
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void free_extent_buffer(struct extent_buffer *eb);
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int read_extent_buffer_pages(struct extent_map_tree *tree,
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struct extent_buffer *eb, u64 start, int wait);
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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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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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int wait_on_extent_buffer_writeback(struct extent_map_tree *tree,
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struct extent_buffer *eb);
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int clear_extent_buffer_dirty(struct extent_map_tree *tree,
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struct extent_buffer *eb);
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int set_extent_buffer_dirty(struct extent_map_tree *tree,
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struct extent_buffer *eb);
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int set_extent_buffer_uptodate(struct extent_map_tree *tree,
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struct extent_buffer *eb);
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int extent_buffer_uptodate(struct extent_map_tree *tree,
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struct extent_buffer *eb);
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int map_extent_buffer(struct extent_buffer *eb, unsigned long offset,
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unsigned long min_len, char **token, char **map,
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unsigned long *map_start,
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unsigned long *map_len, int km);
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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 **token, char **map,
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unsigned long *map_start,
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unsigned long *map_len, int km);
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void unmap_extent_buffer(struct extent_buffer *eb, char *token, int km);
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#endif
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