mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-16 08:44:21 +08:00
452c75c3d2
alloc_extent_buffer() uses radix_tree_lookup() when radix_tree_insert()
fails with EEXIST. That part of the code is very similar to the code in
find_extent_buffer(). This patch replaces radix_tree_lookup() and
surrounding code in alloc_extent_buffer() with find_extent_buffer().
Note that radix_tree_lookup() does not need to be protected by
tree->buffer_lock. It is protected by eb->refs.
While at it, this patch
- changes the other usage of radix_tree_lookup() in alloc_extent_buffer()
with find_extent_buffer() to reduce redundancy.
- removes the unused argument 'len' to find_extent_buffer().
Signed-Off-by: Chandra Seetharaman <sekharan@us.ibm.com>
Reviewed-by: Zach Brown <zab@redhat.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
355 lines
13 KiB
C
355 lines
13 KiB
C
#ifndef __EXTENTIO__
|
|
#define __EXTENTIO__
|
|
|
|
#include <linux/rbtree.h>
|
|
|
|
/* bits for the extent state */
|
|
#define EXTENT_DIRTY 1
|
|
#define EXTENT_WRITEBACK (1 << 1)
|
|
#define EXTENT_UPTODATE (1 << 2)
|
|
#define EXTENT_LOCKED (1 << 3)
|
|
#define EXTENT_NEW (1 << 4)
|
|
#define EXTENT_DELALLOC (1 << 5)
|
|
#define EXTENT_DEFRAG (1 << 6)
|
|
#define EXTENT_DEFRAG_DONE (1 << 7)
|
|
#define EXTENT_BUFFER_FILLED (1 << 8)
|
|
#define EXTENT_BOUNDARY (1 << 9)
|
|
#define EXTENT_NODATASUM (1 << 10)
|
|
#define EXTENT_DO_ACCOUNTING (1 << 11)
|
|
#define EXTENT_FIRST_DELALLOC (1 << 12)
|
|
#define EXTENT_NEED_WAIT (1 << 13)
|
|
#define EXTENT_DAMAGED (1 << 14)
|
|
#define EXTENT_NORESERVE (1 << 15)
|
|
#define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
|
|
#define EXTENT_CTLBITS (EXTENT_DO_ACCOUNTING | EXTENT_FIRST_DELALLOC)
|
|
|
|
/*
|
|
* flags for bio submission. The high bits indicate the compression
|
|
* type for this bio
|
|
*/
|
|
#define EXTENT_BIO_COMPRESSED 1
|
|
#define EXTENT_BIO_TREE_LOG 2
|
|
#define EXTENT_BIO_PARENT_LOCKED 4
|
|
#define EXTENT_BIO_FLAG_SHIFT 16
|
|
|
|
/* these are bit numbers for test/set bit */
|
|
#define EXTENT_BUFFER_UPTODATE 0
|
|
#define EXTENT_BUFFER_BLOCKING 1
|
|
#define EXTENT_BUFFER_DIRTY 2
|
|
#define EXTENT_BUFFER_CORRUPT 3
|
|
#define EXTENT_BUFFER_READAHEAD 4 /* this got triggered by readahead */
|
|
#define EXTENT_BUFFER_TREE_REF 5
|
|
#define EXTENT_BUFFER_STALE 6
|
|
#define EXTENT_BUFFER_WRITEBACK 7
|
|
#define EXTENT_BUFFER_IOERR 8
|
|
#define EXTENT_BUFFER_DUMMY 9
|
|
|
|
/* these are flags for extent_clear_unlock_delalloc */
|
|
#define PAGE_UNLOCK (1 << 0)
|
|
#define PAGE_CLEAR_DIRTY (1 << 1)
|
|
#define PAGE_SET_WRITEBACK (1 << 2)
|
|
#define PAGE_END_WRITEBACK (1 << 3)
|
|
#define PAGE_SET_PRIVATE2 (1 << 4)
|
|
|
|
/*
|
|
* page->private values. Every page that is controlled by the extent
|
|
* map has page->private set to one.
|
|
*/
|
|
#define EXTENT_PAGE_PRIVATE 1
|
|
#define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3
|
|
|
|
struct extent_state;
|
|
struct btrfs_root;
|
|
struct btrfs_io_bio;
|
|
|
|
typedef int (extent_submit_bio_hook_t)(struct inode *inode, int rw,
|
|
struct bio *bio, int mirror_num,
|
|
unsigned long bio_flags, u64 bio_offset);
|
|
struct extent_io_ops {
|
|
int (*fill_delalloc)(struct inode *inode, struct page *locked_page,
|
|
u64 start, u64 end, int *page_started,
|
|
unsigned long *nr_written);
|
|
int (*writepage_start_hook)(struct page *page, u64 start, u64 end);
|
|
int (*writepage_io_hook)(struct page *page, u64 start, u64 end);
|
|
extent_submit_bio_hook_t *submit_bio_hook;
|
|
int (*merge_bio_hook)(int rw, struct page *page, unsigned long offset,
|
|
size_t size, struct bio *bio,
|
|
unsigned long bio_flags);
|
|
int (*readpage_io_failed_hook)(struct page *page, int failed_mirror);
|
|
int (*readpage_end_io_hook)(struct btrfs_io_bio *io_bio, u64 phy_offset,
|
|
struct page *page, u64 start, u64 end,
|
|
int mirror);
|
|
int (*writepage_end_io_hook)(struct page *page, u64 start, u64 end,
|
|
struct extent_state *state, int uptodate);
|
|
void (*set_bit_hook)(struct inode *inode, struct extent_state *state,
|
|
unsigned long *bits);
|
|
void (*clear_bit_hook)(struct inode *inode, struct extent_state *state,
|
|
unsigned long *bits);
|
|
void (*merge_extent_hook)(struct inode *inode,
|
|
struct extent_state *new,
|
|
struct extent_state *other);
|
|
void (*split_extent_hook)(struct inode *inode,
|
|
struct extent_state *orig, u64 split);
|
|
};
|
|
|
|
struct extent_io_tree {
|
|
struct rb_root state;
|
|
struct radix_tree_root buffer;
|
|
struct address_space *mapping;
|
|
u64 dirty_bytes;
|
|
int track_uptodate;
|
|
spinlock_t lock;
|
|
spinlock_t buffer_lock;
|
|
struct extent_io_ops *ops;
|
|
};
|
|
|
|
struct extent_state {
|
|
u64 start;
|
|
u64 end; /* inclusive */
|
|
struct rb_node rb_node;
|
|
|
|
/* ADD NEW ELEMENTS AFTER THIS */
|
|
struct extent_io_tree *tree;
|
|
wait_queue_head_t wq;
|
|
atomic_t refs;
|
|
unsigned long state;
|
|
|
|
/* for use by the FS */
|
|
u64 private;
|
|
|
|
#ifdef CONFIG_BTRFS_DEBUG
|
|
struct list_head leak_list;
|
|
#endif
|
|
};
|
|
|
|
#define INLINE_EXTENT_BUFFER_PAGES 16
|
|
#define MAX_INLINE_EXTENT_BUFFER_SIZE (INLINE_EXTENT_BUFFER_PAGES * PAGE_CACHE_SIZE)
|
|
struct extent_buffer {
|
|
u64 start;
|
|
unsigned long len;
|
|
unsigned long map_start;
|
|
unsigned long map_len;
|
|
unsigned long bflags;
|
|
struct extent_io_tree *tree;
|
|
spinlock_t refs_lock;
|
|
atomic_t refs;
|
|
atomic_t io_pages;
|
|
int read_mirror;
|
|
struct rcu_head rcu_head;
|
|
pid_t lock_owner;
|
|
|
|
/* count of read lock holders on the extent buffer */
|
|
atomic_t write_locks;
|
|
atomic_t read_locks;
|
|
atomic_t blocking_writers;
|
|
atomic_t blocking_readers;
|
|
atomic_t spinning_readers;
|
|
atomic_t spinning_writers;
|
|
int lock_nested;
|
|
|
|
/* protects write locks */
|
|
rwlock_t lock;
|
|
|
|
/* readers use lock_wq while they wait for the write
|
|
* lock holders to unlock
|
|
*/
|
|
wait_queue_head_t write_lock_wq;
|
|
|
|
/* writers use read_lock_wq while they wait for readers
|
|
* to unlock
|
|
*/
|
|
wait_queue_head_t read_lock_wq;
|
|
wait_queue_head_t lock_wq;
|
|
struct page *pages[INLINE_EXTENT_BUFFER_PAGES];
|
|
#ifdef CONFIG_BTRFS_DEBUG
|
|
struct list_head leak_list;
|
|
#endif
|
|
};
|
|
|
|
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 inode *inode,
|
|
struct page *page,
|
|
size_t pg_offset,
|
|
u64 start, u64 len,
|
|
int create);
|
|
|
|
void extent_io_tree_init(struct extent_io_tree *tree,
|
|
struct address_space *mapping);
|
|
int try_release_extent_mapping(struct extent_map_tree *map,
|
|
struct extent_io_tree *tree, struct page *page,
|
|
gfp_t mask);
|
|
int try_release_extent_buffer(struct page *page);
|
|
int lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
|
|
int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
|
|
unsigned long bits, struct extent_state **cached);
|
|
int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end);
|
|
int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end,
|
|
struct extent_state **cached, gfp_t mask);
|
|
int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
|
|
int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
|
|
get_extent_t *get_extent, int mirror_num);
|
|
int extent_read_full_page_nolock(struct extent_io_tree *tree, struct page *page,
|
|
get_extent_t *get_extent, int mirror_num);
|
|
int __init extent_io_init(void);
|
|
void extent_io_exit(void);
|
|
|
|
u64 count_range_bits(struct extent_io_tree *tree,
|
|
u64 *start, u64 search_end,
|
|
u64 max_bytes, unsigned long bits, int contig);
|
|
|
|
void free_extent_state(struct extent_state *state);
|
|
int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
|
|
unsigned long bits, int filled,
|
|
struct extent_state *cached_state);
|
|
int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
|
|
unsigned long bits, gfp_t mask);
|
|
int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
|
|
unsigned long bits, int wake, int delete,
|
|
struct extent_state **cached, gfp_t mask);
|
|
int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
|
|
unsigned long bits, gfp_t mask);
|
|
int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
|
|
unsigned long bits, u64 *failed_start,
|
|
struct extent_state **cached_state, gfp_t mask);
|
|
int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
|
|
struct extent_state **cached_state, gfp_t mask);
|
|
int clear_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
|
|
struct extent_state **cached_state, gfp_t mask);
|
|
int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
|
|
gfp_t mask);
|
|
int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
|
|
gfp_t mask);
|
|
int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
|
|
gfp_t mask);
|
|
int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
|
|
unsigned long bits, unsigned long clear_bits,
|
|
struct extent_state **cached_state, gfp_t mask);
|
|
int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
|
|
struct extent_state **cached_state, gfp_t mask);
|
|
int set_extent_defrag(struct extent_io_tree *tree, u64 start, u64 end,
|
|
struct extent_state **cached_state, gfp_t mask);
|
|
int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
|
|
u64 *start_ret, u64 *end_ret, unsigned long bits,
|
|
struct extent_state **cached_state);
|
|
int extent_invalidatepage(struct extent_io_tree *tree,
|
|
struct page *page, unsigned long offset);
|
|
int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
|
|
get_extent_t *get_extent,
|
|
struct writeback_control *wbc);
|
|
int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode,
|
|
u64 start, u64 end, get_extent_t *get_extent,
|
|
int mode);
|
|
int extent_writepages(struct extent_io_tree *tree,
|
|
struct address_space *mapping,
|
|
get_extent_t *get_extent,
|
|
struct writeback_control *wbc);
|
|
int btree_write_cache_pages(struct address_space *mapping,
|
|
struct writeback_control *wbc);
|
|
int extent_readpages(struct extent_io_tree *tree,
|
|
struct address_space *mapping,
|
|
struct list_head *pages, unsigned nr_pages,
|
|
get_extent_t get_extent);
|
|
int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
|
|
__u64 start, __u64 len, get_extent_t *get_extent);
|
|
int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private);
|
|
void set_page_extent_mapped(struct page *page);
|
|
|
|
struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree,
|
|
u64 start, unsigned long len);
|
|
struct extent_buffer *alloc_dummy_extent_buffer(u64 start, unsigned long len);
|
|
struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src);
|
|
struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree,
|
|
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_io_tree *tree,
|
|
struct extent_buffer *eb, u64 start, int wait,
|
|
get_extent_t *get_extent, int mirror_num);
|
|
void wait_on_extent_buffer_writeback(struct extent_buffer *eb);
|
|
|
|
static inline unsigned long num_extent_pages(u64 start, u64 len)
|
|
{
|
|
return ((start + len + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT) -
|
|
(start >> PAGE_CACHE_SHIFT);
|
|
}
|
|
|
|
static inline struct page *extent_buffer_page(struct extent_buffer *eb,
|
|
unsigned long i)
|
|
{
|
|
return eb->pages[i];
|
|
}
|
|
|
|
static inline void extent_buffer_get(struct extent_buffer *eb)
|
|
{
|
|
atomic_inc(&eb->refs);
|
|
}
|
|
|
|
int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
|
|
unsigned long start,
|
|
unsigned long len);
|
|
void read_extent_buffer(struct extent_buffer *eb, void *dst,
|
|
unsigned long start,
|
|
unsigned long len);
|
|
void write_extent_buffer(struct extent_buffer *eb, const void *src,
|
|
unsigned long start, unsigned long len);
|
|
void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
|
|
unsigned long dst_offset, unsigned long src_offset,
|
|
unsigned long len);
|
|
void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
|
|
unsigned long src_offset, unsigned long len);
|
|
void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
|
|
unsigned long src_offset, unsigned long len);
|
|
void memset_extent_buffer(struct extent_buffer *eb, char c,
|
|
unsigned long start, unsigned long len);
|
|
void clear_extent_buffer_dirty(struct extent_buffer *eb);
|
|
int set_extent_buffer_dirty(struct extent_buffer *eb);
|
|
int set_extent_buffer_uptodate(struct extent_buffer *eb);
|
|
int clear_extent_buffer_uptodate(struct extent_buffer *eb);
|
|
int extent_buffer_uptodate(struct extent_buffer *eb);
|
|
int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
|
|
unsigned long min_len, char **map,
|
|
unsigned long *map_start,
|
|
unsigned long *map_len);
|
|
int extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end);
|
|
int extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end);
|
|
int extent_clear_unlock_delalloc(struct inode *inode, u64 start, u64 end,
|
|
struct page *locked_page,
|
|
unsigned long bits_to_clear,
|
|
unsigned long page_ops);
|
|
struct bio *
|
|
btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs,
|
|
gfp_t gfp_flags);
|
|
struct bio *btrfs_io_bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs);
|
|
struct bio *btrfs_bio_clone(struct bio *bio, gfp_t gfp_mask);
|
|
|
|
struct btrfs_fs_info;
|
|
|
|
int repair_io_failure(struct btrfs_fs_info *fs_info, u64 start,
|
|
u64 length, u64 logical, struct page *page,
|
|
int mirror_num);
|
|
int end_extent_writepage(struct page *page, int err, u64 start, u64 end);
|
|
int repair_eb_io_failure(struct btrfs_root *root, struct extent_buffer *eb,
|
|
int mirror_num);
|
|
#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
|
|
noinline u64 find_lock_delalloc_range(struct inode *inode,
|
|
struct extent_io_tree *tree,
|
|
struct page *locked_page, u64 *start,
|
|
u64 *end, u64 max_bytes);
|
|
#endif
|
|
#endif
|