Contributors: 35
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Chris Mason |
464 |
35.66% |
31 |
21.53% |
| Qu Wenruo |
208 |
15.99% |
13 |
9.03% |
| David Sterba |
115 |
8.84% |
22 |
15.28% |
| Josef Whiter |
91 |
6.99% |
9 |
6.25% |
| Josef Bacik |
85 |
6.53% |
15 |
10.42% |
| Omar Sandoval |
74 |
5.69% |
3 |
2.08% |
| Jan Schmidt |
35 |
2.69% |
2 |
1.39% |
| Christoph Hellwig |
28 |
2.15% |
7 |
4.86% |
| Arne Jansen |
21 |
1.61% |
4 |
2.78% |
| Naohiro Aota |
18 |
1.38% |
3 |
2.08% |
| Jeff Mahoney |
17 |
1.31% |
5 |
3.47% |
| Anand Jain |
17 |
1.31% |
1 |
0.69% |
| Yehuda Sadeh Weinraub |
17 |
1.31% |
1 |
0.69% |
| Sweet Tea Dorminy |
14 |
1.08% |
1 |
0.69% |
| Eric Sandeen |
13 |
1.00% |
2 |
1.39% |
| Nikolay Borisov |
12 |
0.92% |
5 |
3.47% |
| Yan Zheng |
12 |
0.92% |
1 |
0.69% |
| Robin Dong |
10 |
0.77% |
1 |
0.69% |
| Gerhard Heift |
9 |
0.69% |
1 |
0.69% |
| Matthew Wilcox |
8 |
0.61% |
2 |
1.39% |
| Miao Xie |
4 |
0.31% |
1 |
0.69% |
| Stefan Behrens |
4 |
0.31% |
1 |
0.69% |
| Linus Torvalds |
3 |
0.23% |
1 |
0.69% |
| Mark Fasheh |
3 |
0.23% |
1 |
0.69% |
| Wan Jiabing |
3 |
0.23% |
1 |
0.69% |
| Elena Reshetova |
3 |
0.23% |
1 |
0.69% |
| Filipe David Borba Manana |
3 |
0.23% |
1 |
0.69% |
| Zheng Yan |
2 |
0.15% |
1 |
0.69% |
| Geert Uytterhoeven |
2 |
0.15% |
1 |
0.69% |
| Kirill A. Shutemov |
1 |
0.08% |
1 |
0.69% |
| Greg Kroah-Hartman |
1 |
0.08% |
1 |
0.69% |
| Johannes Thumshirn |
1 |
0.08% |
1 |
0.69% |
| Lu Fengqi |
1 |
0.08% |
1 |
0.69% |
| Liu Bo |
1 |
0.08% |
1 |
0.69% |
| Ethan Lien |
1 |
0.08% |
1 |
0.69% |
| Total |
1301 |
|
144 |
|
/* 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 "compression.h"
#include "ulist.h"
#include "misc.h"
struct btrfs_trans_handle;
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,
/* Indicate that extent buffer pages a being read */
EXTENT_BUFFER_READING,
};
/* these are flags for __process_pages_contig */
enum {
ENUM_BIT(PAGE_UNLOCK),
/* Page starts writeback, clear dirty bit and set writeback bit */
ENUM_BIT(PAGE_START_WRITEBACK),
ENUM_BIT(PAGE_END_WRITEBACK),
ENUM_BIT(PAGE_SET_ORDERED),
};
/*
* 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_fs_info;
struct extent_io_tree;
struct btrfs_tree_parent_check;
int __init extent_buffer_init_cachep(void);
void __cold extent_buffer_free_cachep(void);
#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;
int read_mirror;
/* >= 0 if eb belongs to a log tree, -1 otherwise */
s8 log_index;
struct rcu_head rcu_head;
struct rw_semaphore lock;
struct page *pages[INLINE_EXTENT_BUFFER_PAGES];
#ifdef CONFIG_BTRFS_DEBUG
struct list_head leak_list;
pid_t lock_owner;
#endif
};
struct btrfs_eb_write_context {
struct writeback_control *wbc;
struct extent_buffer *eb;
/* Block group @eb resides in. Only used for zoned mode. */
struct btrfs_block_group *zoned_bg;
};
/*
* Get the correct offset inside the page of extent buffer.
*
* @eb: target extent buffer
* @start: offset inside the extent buffer
*
* Will handle both sectorsize == PAGE_SIZE and sectorsize < PAGE_SIZE cases.
*/
static inline size_t get_eb_offset_in_page(const struct extent_buffer *eb,
unsigned long offset)
{
/*
* For sectorsize == PAGE_SIZE case, eb->start will always be aligned
* to PAGE_SIZE, thus adding it won't cause any difference.
*
* For sectorsize < PAGE_SIZE, we must only read the data that belongs
* to the eb, thus we have to take the eb->start into consideration.
*/
return offset_in_page(offset + eb->start);
}
static inline unsigned long get_eb_page_index(unsigned long offset)
{
/*
* For sectorsize == PAGE_SIZE case, plain >> PAGE_SHIFT is enough.
*
* For sectorsize < PAGE_SIZE case, we only support 64K PAGE_SIZE,
* and have ensured that all tree blocks are contained in one page,
* thus we always get index == 0.
*/
return offset >> PAGE_SHIFT;
}
/*
* 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);
}
struct extent_map_tree;
int try_release_extent_mapping(struct page *page, gfp_t mask);
int try_release_extent_buffer(struct page *page);
int btrfs_read_folio(struct file *file, struct folio *folio);
void extent_write_locked_range(struct inode *inode, struct page *locked_page,
u64 start, u64 end, struct writeback_control *wbc,
bool pages_dirty);
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,
struct btrfs_tree_parent_check *parent_check);
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(const struct extent_buffer *eb, const void *src,
unsigned long start, unsigned long len);
static inline void write_extent_buffer_chunk_tree_uuid(
const struct extent_buffer *eb, const void *chunk_tree_uuid)
{
write_extent_buffer(eb, chunk_tree_uuid,
offsetof(struct btrfs_header, chunk_tree_uuid),
BTRFS_FSID_SIZE);
}
static inline void write_extent_buffer_fsid(const struct extent_buffer *eb,
const void *fsid)
{
write_extent_buffer(eb, fsid, offsetof(struct btrfs_header, fsid),
BTRFS_FSID_SIZE);
}
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 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);
void extent_range_clear_dirty_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);
int extent_invalidate_folio(struct extent_io_tree *tree,
struct folio *folio, size_t offset);
void btrfs_clear_buffer_dirty(struct btrfs_trans_handle *trans,
struct extent_buffer *buf);
int btrfs_alloc_page_array(unsigned int nr_pages, struct page **page_array);
#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