mirror of
https://github.com/torvalds/linux.git
synced 2024-11-14 16:12:02 +00:00
b9b3fe152e
5.18 w/ std=gnu11 compiled with gcc-5 wants flags stored in unsigned fields to be unsigned. This manifests as a compiler error such as: /kisskb/src/fs/xfs/./xfs_trace.h:432:2: note: in expansion of macro 'TP_printk' TP_printk("dev %d:%d daddr 0x%llx bbcount 0x%x hold %d pincount %d " ^ /kisskb/src/fs/xfs/./xfs_trace.h:440:5: note: in expansion of macro '__print_flags' __print_flags(__entry->flags, "|", XFS_BUF_FLAGS), ^ /kisskb/src/fs/xfs/xfs_buf.h:67:4: note: in expansion of macro 'XBF_UNMAPPED' { XBF_UNMAPPED, "UNMAPPED" } ^ /kisskb/src/fs/xfs/./xfs_trace.h:440:40: note: in expansion of macro 'XFS_BUF_FLAGS' __print_flags(__entry->flags, "|", XFS_BUF_FLAGS), ^ /kisskb/src/fs/xfs/./xfs_trace.h: In function 'trace_raw_output_xfs_buf_flags_class': /kisskb/src/fs/xfs/xfs_buf.h:46:23: error: initializer element is not constant #define XBF_UNMAPPED (1 << 31)/* do not map the buffer */ as __print_flags assigns XFS_BUF_FLAGS to a structure that uses an unsigned long for the flag. Since this results in the value of XBF_UNMAPPED causing a signed integer overflow, the result is technically undefined behavior, which gcc-5 does not accept as an integer constant. This is based on a patch from Arnd Bergman <arnd@arndb.de>. Reported-by: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Chandan Babu R <chandan.babu@oracle.com> Signed-off-by: Dave Chinner <david@fromorbit.com>
357 lines
12 KiB
C
357 lines
12 KiB
C
// 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 (1u << 0) /* buffer intended for reading from device */
|
|
#define XBF_WRITE (1u << 1) /* buffer intended for writing to device */
|
|
#define XBF_READ_AHEAD (1u << 2) /* asynchronous read-ahead */
|
|
#define XBF_NO_IOACCT (1u << 3) /* bypass I/O accounting (non-LRU bufs) */
|
|
#define XBF_ASYNC (1u << 4) /* initiator will not wait for completion */
|
|
#define XBF_DONE (1u << 5) /* all pages in the buffer uptodate */
|
|
#define XBF_STALE (1u << 6) /* buffer has been staled, do not find it */
|
|
#define XBF_WRITE_FAIL (1u << 7) /* async writes have failed on this buffer */
|
|
|
|
/* buffer type flags for write callbacks */
|
|
#define _XBF_INODES (1u << 16)/* inode buffer */
|
|
#define _XBF_DQUOTS (1u << 17)/* dquot buffer */
|
|
#define _XBF_LOGRECOVERY (1u << 18)/* log recovery buffer */
|
|
|
|
/* flags used only internally */
|
|
#define _XBF_PAGES (1u << 20)/* backed by refcounted pages */
|
|
#define _XBF_KMEM (1u << 21)/* backed by heap memory */
|
|
#define _XBF_DELWRI_Q (1u << 22)/* buffer on a delwri queue */
|
|
|
|
/* flags used only as arguments to access routines */
|
|
#define XBF_TRYLOCK (1u << 30)/* lock requested, but do not wait */
|
|
#define XBF_UNMAPPED (1u << 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;
|
|
u64 bt_dax_part_off;
|
|
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);
|
|
};
|
|
|
|
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_rhash_key; /* buffer cache index */
|
|
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;
|
|
struct xfs_buftarg *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 of b_addr,
|
|
only for _XBF_KMEM buffers */
|
|
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;
|
|
};
|
|
|
|
/* 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,
|
|
xfs_buf_flags_t flags, struct xfs_buf **bpp);
|
|
int xfs_buf_read_uncached(struct xfs_buftarg *target, xfs_daddr_t daddr,
|
|
size_t numblks, xfs_buf_flags_t 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(struct xfs_buf *);
|
|
|
|
/* Locking and Unlocking Buffers */
|
|
extern int xfs_buf_trylock(struct xfs_buf *);
|
|
extern void xfs_buf_lock(struct xfs_buf *);
|
|
extern void xfs_buf_unlock(struct xfs_buf *);
|
|
#define xfs_buf_islocked(bp) \
|
|
((bp)->b_sema.count <= 0)
|
|
|
|
static inline void xfs_buf_relse(struct xfs_buf *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);
|
|
|
|
static inline xfs_daddr_t xfs_buf_daddr(struct xfs_buf *bp)
|
|
{
|
|
return bp->b_maps[0].bm_bn;
|
|
}
|
|
|
|
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.
|
|
*/
|
|
struct xfs_buftarg *xfs_alloc_buftarg(struct xfs_mount *mp,
|
|
struct block_device *bdev);
|
|
extern void xfs_free_buftarg(struct xfs_buftarg *);
|
|
extern void xfs_buftarg_wait(struct xfs_buftarg *);
|
|
extern void xfs_buftarg_drain(struct xfs_buftarg *);
|
|
extern int xfs_setsize_buftarg(struct xfs_buftarg *, unsigned int);
|
|
|
|
#define xfs_getsize_buftarg(buftarg) block_size((buftarg)->bt_bdev)
|
|
#define xfs_readonly_buftarg(buftarg) bdev_read_only((buftarg)->bt_bdev)
|
|
|
|
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__ */
|