mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
366 lines
12 KiB
366 lines
12 KiB
// SPDX-License-Identifier: GPL-2.0 |
|
/* |
|
* Copyright (c) 2000-2005 Silicon Graphics, Inc. |
|
* All Rights Reserved. |
|
*/ |
|
#ifndef __XFS_BUF_H__ |
|
#define __XFS_BUF_H__ |
|
|
|
#include <linux/list.h> |
|
#include <linux/types.h> |
|
#include <linux/spinlock.h> |
|
#include <linux/mm.h> |
|
#include <linux/fs.h> |
|
#include <linux/dax.h> |
|
#include <linux/uio.h> |
|
#include <linux/list_lru.h> |
|
|
|
/* |
|
* Base types |
|
*/ |
|
struct xfs_buf; |
|
|
|
#define XFS_BUF_DADDR_NULL ((xfs_daddr_t) (-1LL)) |
|
|
|
#define XBF_READ (1 << 0) /* buffer intended for reading from device */ |
|
#define XBF_WRITE (1 << 1) /* buffer intended for writing to device */ |
|
#define XBF_READ_AHEAD (1 << 2) /* asynchronous read-ahead */ |
|
#define XBF_NO_IOACCT (1 << 3) /* bypass I/O accounting (non-LRU bufs) */ |
|
#define XBF_ASYNC (1 << 4) /* initiator will not wait for completion */ |
|
#define XBF_DONE (1 << 5) /* all pages in the buffer uptodate */ |
|
#define XBF_STALE (1 << 6) /* buffer has been staled, do not find it */ |
|
#define XBF_WRITE_FAIL (1 << 7) /* async writes have failed on this buffer */ |
|
|
|
/* buffer type flags for write callbacks */ |
|
#define _XBF_INODES (1 << 16)/* inode buffer */ |
|
#define _XBF_DQUOTS (1 << 17)/* dquot buffer */ |
|
#define _XBF_LOGRECOVERY (1 << 18)/* log recovery buffer */ |
|
|
|
/* flags used only internally */ |
|
#define _XBF_PAGES (1 << 20)/* backed by refcounted pages */ |
|
#define _XBF_KMEM (1 << 21)/* backed by heap memory */ |
|
#define _XBF_DELWRI_Q (1 << 22)/* buffer on a delwri queue */ |
|
|
|
/* flags used only as arguments to access routines */ |
|
#define XBF_TRYLOCK (1 << 30)/* lock requested, but do not wait */ |
|
#define XBF_UNMAPPED (1 << 31)/* do not map the buffer */ |
|
|
|
typedef unsigned int xfs_buf_flags_t; |
|
|
|
#define XFS_BUF_FLAGS \ |
|
{ XBF_READ, "READ" }, \ |
|
{ XBF_WRITE, "WRITE" }, \ |
|
{ XBF_READ_AHEAD, "READ_AHEAD" }, \ |
|
{ XBF_NO_IOACCT, "NO_IOACCT" }, \ |
|
{ XBF_ASYNC, "ASYNC" }, \ |
|
{ XBF_DONE, "DONE" }, \ |
|
{ XBF_STALE, "STALE" }, \ |
|
{ XBF_WRITE_FAIL, "WRITE_FAIL" }, \ |
|
{ _XBF_INODES, "INODES" }, \ |
|
{ _XBF_DQUOTS, "DQUOTS" }, \ |
|
{ _XBF_LOGRECOVERY, "LOG_RECOVERY" }, \ |
|
{ _XBF_PAGES, "PAGES" }, \ |
|
{ _XBF_KMEM, "KMEM" }, \ |
|
{ _XBF_DELWRI_Q, "DELWRI_Q" }, \ |
|
/* The following interface flags should never be set */ \ |
|
{ XBF_TRYLOCK, "TRYLOCK" }, \ |
|
{ XBF_UNMAPPED, "UNMAPPED" } |
|
|
|
/* |
|
* Internal state flags. |
|
*/ |
|
#define XFS_BSTATE_DISPOSE (1 << 0) /* buffer being discarded */ |
|
#define XFS_BSTATE_IN_FLIGHT (1 << 1) /* I/O in flight */ |
|
|
|
/* |
|
* The xfs_buftarg contains 2 notions of "sector size" - |
|
* |
|
* 1) The metadata sector size, which is the minimum unit and |
|
* alignment of IO which will be performed by metadata operations. |
|
* 2) The device logical sector size |
|
* |
|
* The first is specified at mkfs time, and is stored on-disk in the |
|
* superblock's sb_sectsize. |
|
* |
|
* The latter is derived from the underlying device, and controls direct IO |
|
* alignment constraints. |
|
*/ |
|
typedef struct xfs_buftarg { |
|
dev_t bt_dev; |
|
struct block_device *bt_bdev; |
|
struct dax_device *bt_daxdev; |
|
struct xfs_mount *bt_mount; |
|
unsigned int bt_meta_sectorsize; |
|
size_t bt_meta_sectormask; |
|
size_t bt_logical_sectorsize; |
|
size_t bt_logical_sectormask; |
|
|
|
/* LRU control structures */ |
|
struct shrinker bt_shrinker; |
|
struct list_lru bt_lru; |
|
|
|
struct percpu_counter bt_io_count; |
|
struct ratelimit_state bt_ioerror_rl; |
|
} xfs_buftarg_t; |
|
|
|
#define XB_PAGES 2 |
|
|
|
struct xfs_buf_map { |
|
xfs_daddr_t bm_bn; /* block number for I/O */ |
|
int bm_len; /* size of I/O */ |
|
}; |
|
|
|
#define DEFINE_SINGLE_BUF_MAP(map, blkno, numblk) \ |
|
struct xfs_buf_map (map) = { .bm_bn = (blkno), .bm_len = (numblk) }; |
|
|
|
struct xfs_buf_ops { |
|
char *name; |
|
union { |
|
__be32 magic[2]; /* v4 and v5 on disk magic values */ |
|
__be16 magic16[2]; /* v4 and v5 on disk magic values */ |
|
}; |
|
void (*verify_read)(struct xfs_buf *); |
|
void (*verify_write)(struct xfs_buf *); |
|
xfs_failaddr_t (*verify_struct)(struct xfs_buf *bp); |
|
}; |
|
|
|
typedef struct xfs_buf { |
|
/* |
|
* first cacheline holds all the fields needed for an uncontended cache |
|
* hit to be fully processed. The semaphore straddles the cacheline |
|
* boundary, but the counter and lock sits on the first cacheline, |
|
* which is the only bit that is touched if we hit the semaphore |
|
* fast-path on locking. |
|
*/ |
|
struct rhash_head b_rhash_head; /* pag buffer hash node */ |
|
xfs_daddr_t b_bn; /* block number of buffer */ |
|
int b_length; /* size of buffer in BBs */ |
|
atomic_t b_hold; /* reference count */ |
|
atomic_t b_lru_ref; /* lru reclaim ref count */ |
|
xfs_buf_flags_t b_flags; /* status flags */ |
|
struct semaphore b_sema; /* semaphore for lockables */ |
|
|
|
/* |
|
* concurrent access to b_lru and b_lru_flags are protected by |
|
* bt_lru_lock and not by b_sema |
|
*/ |
|
struct list_head b_lru; /* lru list */ |
|
spinlock_t b_lock; /* internal state lock */ |
|
unsigned int b_state; /* internal state flags */ |
|
int b_io_error; /* internal IO error state */ |
|
wait_queue_head_t b_waiters; /* unpin waiters */ |
|
struct list_head b_list; |
|
struct xfs_perag *b_pag; /* contains rbtree root */ |
|
struct xfs_mount *b_mount; |
|
xfs_buftarg_t *b_target; /* buffer target (device) */ |
|
void *b_addr; /* virtual address of buffer */ |
|
struct work_struct b_ioend_work; |
|
struct completion b_iowait; /* queue for I/O waiters */ |
|
struct xfs_buf_log_item *b_log_item; |
|
struct list_head b_li_list; /* Log items list head */ |
|
struct xfs_trans *b_transp; |
|
struct page **b_pages; /* array of page pointers */ |
|
struct page *b_page_array[XB_PAGES]; /* inline pages */ |
|
struct xfs_buf_map *b_maps; /* compound buffer map */ |
|
struct xfs_buf_map __b_map; /* inline compound buffer map */ |
|
int b_map_count; |
|
atomic_t b_pin_count; /* pin count */ |
|
atomic_t b_io_remaining; /* #outstanding I/O requests */ |
|
unsigned int b_page_count; /* size of page array */ |
|
unsigned int b_offset; /* page offset in first page */ |
|
int b_error; /* error code on I/O */ |
|
|
|
/* |
|
* async write failure retry count. Initialised to zero on the first |
|
* failure, then when it exceeds the maximum configured without a |
|
* success the write is considered to be failed permanently and the |
|
* iodone handler will take appropriate action. |
|
* |
|
* For retry timeouts, we record the jiffie of the first failure. This |
|
* means that we can change the retry timeout for buffers already under |
|
* I/O and thus avoid getting stuck in a retry loop with a long timeout. |
|
* |
|
* last_error is used to ensure that we are getting repeated errors, not |
|
* different errors. e.g. a block device might change ENOSPC to EIO when |
|
* a failure timeout occurs, so we want to re-initialise the error |
|
* retry behaviour appropriately when that happens. |
|
*/ |
|
int b_retries; |
|
unsigned long b_first_retry_time; /* in jiffies */ |
|
int b_last_error; |
|
|
|
const struct xfs_buf_ops *b_ops; |
|
} xfs_buf_t; |
|
|
|
/* Finding and Reading Buffers */ |
|
struct xfs_buf *xfs_buf_incore(struct xfs_buftarg *target, |
|
xfs_daddr_t blkno, size_t numblks, |
|
xfs_buf_flags_t flags); |
|
|
|
int xfs_buf_get_map(struct xfs_buftarg *target, struct xfs_buf_map *map, |
|
int nmaps, xfs_buf_flags_t flags, struct xfs_buf **bpp); |
|
int xfs_buf_read_map(struct xfs_buftarg *target, struct xfs_buf_map *map, |
|
int nmaps, xfs_buf_flags_t flags, struct xfs_buf **bpp, |
|
const struct xfs_buf_ops *ops, xfs_failaddr_t fa); |
|
void xfs_buf_readahead_map(struct xfs_buftarg *target, |
|
struct xfs_buf_map *map, int nmaps, |
|
const struct xfs_buf_ops *ops); |
|
|
|
static inline int |
|
xfs_buf_get( |
|
struct xfs_buftarg *target, |
|
xfs_daddr_t blkno, |
|
size_t numblks, |
|
struct xfs_buf **bpp) |
|
{ |
|
DEFINE_SINGLE_BUF_MAP(map, blkno, numblks); |
|
|
|
return xfs_buf_get_map(target, &map, 1, 0, bpp); |
|
} |
|
|
|
static inline int |
|
xfs_buf_read( |
|
struct xfs_buftarg *target, |
|
xfs_daddr_t blkno, |
|
size_t numblks, |
|
xfs_buf_flags_t flags, |
|
struct xfs_buf **bpp, |
|
const struct xfs_buf_ops *ops) |
|
{ |
|
DEFINE_SINGLE_BUF_MAP(map, blkno, numblks); |
|
|
|
return xfs_buf_read_map(target, &map, 1, flags, bpp, ops, |
|
__builtin_return_address(0)); |
|
} |
|
|
|
static inline void |
|
xfs_buf_readahead( |
|
struct xfs_buftarg *target, |
|
xfs_daddr_t blkno, |
|
size_t numblks, |
|
const struct xfs_buf_ops *ops) |
|
{ |
|
DEFINE_SINGLE_BUF_MAP(map, blkno, numblks); |
|
return xfs_buf_readahead_map(target, &map, 1, ops); |
|
} |
|
|
|
int xfs_buf_get_uncached(struct xfs_buftarg *target, size_t numblks, int flags, |
|
struct xfs_buf **bpp); |
|
int xfs_buf_read_uncached(struct xfs_buftarg *target, xfs_daddr_t daddr, |
|
size_t numblks, int flags, struct xfs_buf **bpp, |
|
const struct xfs_buf_ops *ops); |
|
int _xfs_buf_read(struct xfs_buf *bp, xfs_buf_flags_t flags); |
|
void xfs_buf_hold(struct xfs_buf *bp); |
|
|
|
/* Releasing Buffers */ |
|
extern void xfs_buf_rele(xfs_buf_t *); |
|
|
|
/* Locking and Unlocking Buffers */ |
|
extern int xfs_buf_trylock(xfs_buf_t *); |
|
extern void xfs_buf_lock(xfs_buf_t *); |
|
extern void xfs_buf_unlock(xfs_buf_t *); |
|
#define xfs_buf_islocked(bp) \ |
|
((bp)->b_sema.count <= 0) |
|
|
|
static inline void xfs_buf_relse(xfs_buf_t *bp) |
|
{ |
|
xfs_buf_unlock(bp); |
|
xfs_buf_rele(bp); |
|
} |
|
|
|
/* Buffer Read and Write Routines */ |
|
extern int xfs_bwrite(struct xfs_buf *bp); |
|
|
|
extern void __xfs_buf_ioerror(struct xfs_buf *bp, int error, |
|
xfs_failaddr_t failaddr); |
|
#define xfs_buf_ioerror(bp, err) __xfs_buf_ioerror((bp), (err), __this_address) |
|
extern void xfs_buf_ioerror_alert(struct xfs_buf *bp, xfs_failaddr_t fa); |
|
void xfs_buf_ioend_fail(struct xfs_buf *); |
|
void xfs_buf_zero(struct xfs_buf *bp, size_t boff, size_t bsize); |
|
void __xfs_buf_mark_corrupt(struct xfs_buf *bp, xfs_failaddr_t fa); |
|
#define xfs_buf_mark_corrupt(bp) __xfs_buf_mark_corrupt((bp), __this_address) |
|
|
|
/* Buffer Utility Routines */ |
|
extern void *xfs_buf_offset(struct xfs_buf *, size_t); |
|
extern void xfs_buf_stale(struct xfs_buf *bp); |
|
|
|
/* Delayed Write Buffer Routines */ |
|
extern void xfs_buf_delwri_cancel(struct list_head *); |
|
extern bool xfs_buf_delwri_queue(struct xfs_buf *, struct list_head *); |
|
extern int xfs_buf_delwri_submit(struct list_head *); |
|
extern int xfs_buf_delwri_submit_nowait(struct list_head *); |
|
extern int xfs_buf_delwri_pushbuf(struct xfs_buf *, struct list_head *); |
|
|
|
/* Buffer Daemon Setup Routines */ |
|
extern int xfs_buf_init(void); |
|
extern void xfs_buf_terminate(void); |
|
|
|
/* |
|
* These macros use the IO block map rather than b_bn. b_bn is now really |
|
* just for the buffer cache index for cached buffers. As IO does not use b_bn |
|
* anymore, uncached buffers do not use b_bn at all and hence must modify the IO |
|
* map directly. Uncached buffers are not allowed to be discontiguous, so this |
|
* is safe to do. |
|
* |
|
* In future, uncached buffers will pass the block number directly to the io |
|
* request function and hence these macros will go away at that point. |
|
*/ |
|
#define XFS_BUF_ADDR(bp) ((bp)->b_maps[0].bm_bn) |
|
#define XFS_BUF_SET_ADDR(bp, bno) ((bp)->b_maps[0].bm_bn = (xfs_daddr_t)(bno)) |
|
|
|
void xfs_buf_set_ref(struct xfs_buf *bp, int lru_ref); |
|
|
|
/* |
|
* If the buffer is already on the LRU, do nothing. Otherwise set the buffer |
|
* up with a reference count of 0 so it will be tossed from the cache when |
|
* released. |
|
*/ |
|
static inline void xfs_buf_oneshot(struct xfs_buf *bp) |
|
{ |
|
if (!list_empty(&bp->b_lru) || atomic_read(&bp->b_lru_ref) > 1) |
|
return; |
|
atomic_set(&bp->b_lru_ref, 0); |
|
} |
|
|
|
static inline int xfs_buf_ispinned(struct xfs_buf *bp) |
|
{ |
|
return atomic_read(&bp->b_pin_count); |
|
} |
|
|
|
static inline int |
|
xfs_buf_verify_cksum(struct xfs_buf *bp, unsigned long cksum_offset) |
|
{ |
|
return xfs_verify_cksum(bp->b_addr, BBTOB(bp->b_length), |
|
cksum_offset); |
|
} |
|
|
|
static inline void |
|
xfs_buf_update_cksum(struct xfs_buf *bp, unsigned long cksum_offset) |
|
{ |
|
xfs_update_cksum(bp->b_addr, BBTOB(bp->b_length), |
|
cksum_offset); |
|
} |
|
|
|
/* |
|
* Handling of buftargs. |
|
*/ |
|
extern xfs_buftarg_t *xfs_alloc_buftarg(struct xfs_mount *, |
|
struct block_device *, struct dax_device *); |
|
extern void xfs_free_buftarg(struct xfs_buftarg *); |
|
extern void xfs_wait_buftarg(xfs_buftarg_t *); |
|
extern int xfs_setsize_buftarg(xfs_buftarg_t *, unsigned int); |
|
|
|
#define xfs_getsize_buftarg(buftarg) block_size((buftarg)->bt_bdev) |
|
#define xfs_readonly_buftarg(buftarg) bdev_read_only((buftarg)->bt_bdev) |
|
|
|
static inline int |
|
xfs_buftarg_dma_alignment(struct xfs_buftarg *bt) |
|
{ |
|
return queue_dma_alignment(bt->bt_bdev->bd_disk->queue); |
|
} |
|
|
|
int xfs_buf_reverify(struct xfs_buf *bp, const struct xfs_buf_ops *ops); |
|
bool xfs_verify_magic(struct xfs_buf *bp, __be32 dmagic); |
|
bool xfs_verify_magic16(struct xfs_buf *bp, __be16 dmagic); |
|
|
|
#endif /* __XFS_BUF_H__ */
|
|
|