394 lines
14 KiB
C
394 lines
14 KiB
C
/*
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* Copyright (c) 2000-2005 Silicon Graphics, Inc.
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* All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef __XFS_BUF_H__
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#define __XFS_BUF_H__
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#include <linux/list.h>
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#include <linux/types.h>
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#include <linux/spinlock.h>
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#include <asm/system.h>
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#include <linux/mm.h>
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#include <linux/fs.h>
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#include <linux/buffer_head.h>
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#include <linux/uio.h>
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/*
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* Base types
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*/
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#define XFS_BUF_DADDR_NULL ((xfs_daddr_t) (-1LL))
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#define xfs_buf_ctob(pp) ((pp) * PAGE_CACHE_SIZE)
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#define xfs_buf_btoc(dd) (((dd) + PAGE_CACHE_SIZE-1) >> PAGE_CACHE_SHIFT)
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#define xfs_buf_btoct(dd) ((dd) >> PAGE_CACHE_SHIFT)
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#define xfs_buf_poff(aa) ((aa) & ~PAGE_CACHE_MASK)
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typedef enum {
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XBRW_READ = 1, /* transfer into target memory */
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XBRW_WRITE = 2, /* transfer from target memory */
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XBRW_ZERO = 3, /* Zero target memory */
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} xfs_buf_rw_t;
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#define XBF_READ (1 << 0) /* buffer intended for reading from device */
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#define XBF_WRITE (1 << 1) /* buffer intended for writing to device */
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#define XBF_MAPPED (1 << 2) /* buffer mapped (b_addr valid) */
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#define XBF_ASYNC (1 << 4) /* initiator will not wait for completion */
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#define XBF_DONE (1 << 5) /* all pages in the buffer uptodate */
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#define XBF_DELWRI (1 << 6) /* buffer has dirty pages */
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#define XBF_STALE (1 << 7) /* buffer has been staled, do not find it */
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#define XBF_FS_MANAGED (1 << 8) /* filesystem controls freeing memory */
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#define XBF_ORDERED (1 << 11)/* use ordered writes */
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#define XBF_READ_AHEAD (1 << 12)/* asynchronous read-ahead */
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#define XBF_LOG_BUFFER (1 << 13)/* this is a buffer used for the log */
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/* flags used only as arguments to access routines */
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#define XBF_LOCK (1 << 14)/* lock requested */
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#define XBF_TRYLOCK (1 << 15)/* lock requested, but do not wait */
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#define XBF_DONT_BLOCK (1 << 16)/* do not block in current thread */
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/* flags used only internally */
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#define _XBF_PAGE_CACHE (1 << 17)/* backed by pagecache */
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#define _XBF_PAGES (1 << 18)/* backed by refcounted pages */
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#define _XBF_RUN_QUEUES (1 << 19)/* run block device task queue */
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#define _XBF_DELWRI_Q (1 << 21)/* buffer on delwri queue */
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/*
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* Special flag for supporting metadata blocks smaller than a FSB.
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*
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* In this case we can have multiple xfs_buf_t on a single page and
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* need to lock out concurrent xfs_buf_t readers as they only
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* serialise access to the buffer.
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*
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* If the FSB size >= PAGE_CACHE_SIZE case, we have no serialisation
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* between reads of the page. Hence we can have one thread read the
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* page and modify it, but then race with another thread that thinks
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* the page is not up-to-date and hence reads it again.
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*
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* The result is that the first modifcation to the page is lost.
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* This sort of AGF/AGI reading race can happen when unlinking inodes
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* that require truncation and results in the AGI unlinked list
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* modifications being lost.
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*/
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#define _XBF_PAGE_LOCKED (1 << 22)
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/*
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* If we try a barrier write, but it fails we have to communicate
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* this to the upper layers. Unfortunately b_error gets overwritten
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* when the buffer is re-issued so we have to add another flag to
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* keep this information.
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*/
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#define _XFS_BARRIER_FAILED (1 << 23)
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typedef unsigned int xfs_buf_flags_t;
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#define XFS_BUF_FLAGS \
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{ XBF_READ, "READ" }, \
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{ XBF_WRITE, "WRITE" }, \
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{ XBF_MAPPED, "MAPPED" }, \
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{ XBF_ASYNC, "ASYNC" }, \
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{ XBF_DONE, "DONE" }, \
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{ XBF_DELWRI, "DELWRI" }, \
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{ XBF_STALE, "STALE" }, \
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{ XBF_FS_MANAGED, "FS_MANAGED" }, \
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{ XBF_ORDERED, "ORDERED" }, \
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{ XBF_READ_AHEAD, "READ_AHEAD" }, \
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{ XBF_LOCK, "LOCK" }, /* should never be set */\
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{ XBF_TRYLOCK, "TRYLOCK" }, /* ditto */\
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{ XBF_DONT_BLOCK, "DONT_BLOCK" }, /* ditto */\
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{ _XBF_PAGE_CACHE, "PAGE_CACHE" }, \
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{ _XBF_PAGES, "PAGES" }, \
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{ _XBF_RUN_QUEUES, "RUN_QUEUES" }, \
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{ _XBF_DELWRI_Q, "DELWRI_Q" }, \
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{ _XBF_PAGE_LOCKED, "PAGE_LOCKED" }, \
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{ _XFS_BARRIER_FAILED, "BARRIER_FAILED" }
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typedef enum {
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XBT_FORCE_SLEEP = 0,
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XBT_FORCE_FLUSH = 1,
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} xfs_buftarg_flags_t;
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typedef struct xfs_bufhash {
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struct list_head bh_list;
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spinlock_t bh_lock;
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} xfs_bufhash_t;
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typedef struct xfs_buftarg {
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dev_t bt_dev;
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struct block_device *bt_bdev;
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struct address_space *bt_mapping;
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unsigned int bt_bsize;
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unsigned int bt_sshift;
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size_t bt_smask;
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/* per device buffer hash table */
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uint bt_hashshift;
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xfs_bufhash_t *bt_hash;
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/* per device delwri queue */
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struct task_struct *bt_task;
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struct list_head bt_list;
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struct list_head bt_delwrite_queue;
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spinlock_t bt_delwrite_lock;
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unsigned long bt_flags;
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} xfs_buftarg_t;
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/*
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* xfs_buf_t: Buffer structure for pagecache-based buffers
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*
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* This buffer structure is used by the pagecache buffer management routines
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* to refer to an assembly of pages forming a logical buffer.
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*
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* The buffer structure is used on a temporary basis only, and discarded when
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* released. The real data storage is recorded in the pagecache. Buffers are
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* hashed to the block device on which the file system resides.
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*/
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struct xfs_buf;
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typedef void (*xfs_buf_iodone_t)(struct xfs_buf *);
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typedef void (*xfs_buf_relse_t)(struct xfs_buf *);
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typedef int (*xfs_buf_bdstrat_t)(struct xfs_buf *);
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#define XB_PAGES 2
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typedef struct xfs_buf {
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struct semaphore b_sema; /* semaphore for lockables */
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unsigned long b_queuetime; /* time buffer was queued */
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atomic_t b_pin_count; /* pin count */
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wait_queue_head_t b_waiters; /* unpin waiters */
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struct list_head b_list;
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xfs_buf_flags_t b_flags; /* status flags */
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struct list_head b_hash_list; /* hash table list */
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xfs_bufhash_t *b_hash; /* hash table list start */
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xfs_buftarg_t *b_target; /* buffer target (device) */
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atomic_t b_hold; /* reference count */
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xfs_daddr_t b_bn; /* block number for I/O */
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xfs_off_t b_file_offset; /* offset in file */
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size_t b_buffer_length;/* size of buffer in bytes */
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size_t b_count_desired;/* desired transfer size */
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void *b_addr; /* virtual address of buffer */
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struct work_struct b_iodone_work;
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atomic_t b_io_remaining; /* #outstanding I/O requests */
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xfs_buf_iodone_t b_iodone; /* I/O completion function */
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xfs_buf_relse_t b_relse; /* releasing function */
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struct completion b_iowait; /* queue for I/O waiters */
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void *b_fspriv;
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void *b_fspriv2;
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struct xfs_mount *b_mount;
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unsigned short b_error; /* error code on I/O */
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unsigned int b_page_count; /* size of page array */
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unsigned int b_offset; /* page offset in first page */
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struct page **b_pages; /* array of page pointers */
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struct page *b_page_array[XB_PAGES]; /* inline pages */
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#ifdef XFS_BUF_LOCK_TRACKING
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int b_last_holder;
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#endif
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} xfs_buf_t;
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/* Finding and Reading Buffers */
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extern xfs_buf_t *_xfs_buf_find(xfs_buftarg_t *, xfs_off_t, size_t,
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xfs_buf_flags_t, xfs_buf_t *);
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#define xfs_incore(buftarg,blkno,len,lockit) \
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_xfs_buf_find(buftarg, blkno ,len, lockit, NULL)
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extern xfs_buf_t *xfs_buf_get(xfs_buftarg_t *, xfs_off_t, size_t,
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xfs_buf_flags_t);
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extern xfs_buf_t *xfs_buf_read(xfs_buftarg_t *, xfs_off_t, size_t,
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xfs_buf_flags_t);
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extern xfs_buf_t *xfs_buf_get_empty(size_t, xfs_buftarg_t *);
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extern xfs_buf_t *xfs_buf_get_noaddr(size_t, xfs_buftarg_t *);
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extern int xfs_buf_associate_memory(xfs_buf_t *, void *, size_t);
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extern void xfs_buf_hold(xfs_buf_t *);
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extern void xfs_buf_readahead(xfs_buftarg_t *, xfs_off_t, size_t,
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xfs_buf_flags_t);
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/* Releasing Buffers */
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extern void xfs_buf_free(xfs_buf_t *);
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extern void xfs_buf_rele(xfs_buf_t *);
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/* Locking and Unlocking Buffers */
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extern int xfs_buf_cond_lock(xfs_buf_t *);
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extern int xfs_buf_lock_value(xfs_buf_t *);
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extern void xfs_buf_lock(xfs_buf_t *);
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extern void xfs_buf_unlock(xfs_buf_t *);
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/* Buffer Read and Write Routines */
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extern int xfs_bwrite(struct xfs_mount *mp, struct xfs_buf *bp);
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extern void xfs_bdwrite(void *mp, xfs_buf_t *bp);
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extern void xfsbdstrat(struct xfs_mount *, struct xfs_buf *);
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extern int xfs_bdstrat_cb(struct xfs_buf *);
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extern void xfs_buf_ioend(xfs_buf_t *, int);
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extern void xfs_buf_ioerror(xfs_buf_t *, int);
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extern int xfs_buf_iorequest(xfs_buf_t *);
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extern int xfs_buf_iowait(xfs_buf_t *);
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extern void xfs_buf_iomove(xfs_buf_t *, size_t, size_t, void *,
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xfs_buf_rw_t);
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static inline int xfs_buf_geterror(xfs_buf_t *bp)
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{
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return bp ? bp->b_error : ENOMEM;
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}
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/* Buffer Utility Routines */
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extern xfs_caddr_t xfs_buf_offset(xfs_buf_t *, size_t);
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/* Delayed Write Buffer Routines */
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extern void xfs_buf_delwri_dequeue(xfs_buf_t *);
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extern void xfs_buf_delwri_promote(xfs_buf_t *);
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/* Buffer Daemon Setup Routines */
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extern int xfs_buf_init(void);
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extern void xfs_buf_terminate(void);
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#define xfs_buf_target_name(target) \
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({ char __b[BDEVNAME_SIZE]; bdevname((target)->bt_bdev, __b); __b; })
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#define XFS_BUF_BFLAGS(bp) ((bp)->b_flags)
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#define XFS_BUF_ZEROFLAGS(bp) ((bp)->b_flags &= \
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~(XBF_READ|XBF_WRITE|XBF_ASYNC|XBF_DELWRI|XBF_ORDERED))
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#define XFS_BUF_STALE(bp) ((bp)->b_flags |= XBF_STALE)
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#define XFS_BUF_UNSTALE(bp) ((bp)->b_flags &= ~XBF_STALE)
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#define XFS_BUF_ISSTALE(bp) ((bp)->b_flags & XBF_STALE)
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#define XFS_BUF_SUPER_STALE(bp) do { \
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XFS_BUF_STALE(bp); \
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xfs_buf_delwri_dequeue(bp); \
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XFS_BUF_DONE(bp); \
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} while (0)
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#define XFS_BUF_UNMANAGE(bp) ((bp)->b_flags &= ~XBF_FS_MANAGED)
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#define XFS_BUF_DELAYWRITE(bp) ((bp)->b_flags |= XBF_DELWRI)
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#define XFS_BUF_UNDELAYWRITE(bp) xfs_buf_delwri_dequeue(bp)
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#define XFS_BUF_ISDELAYWRITE(bp) ((bp)->b_flags & XBF_DELWRI)
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#define XFS_BUF_ERROR(bp,no) xfs_buf_ioerror(bp,no)
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#define XFS_BUF_GETERROR(bp) xfs_buf_geterror(bp)
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#define XFS_BUF_ISERROR(bp) (xfs_buf_geterror(bp) ? 1 : 0)
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#define XFS_BUF_DONE(bp) ((bp)->b_flags |= XBF_DONE)
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#define XFS_BUF_UNDONE(bp) ((bp)->b_flags &= ~XBF_DONE)
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#define XFS_BUF_ISDONE(bp) ((bp)->b_flags & XBF_DONE)
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#define XFS_BUF_BUSY(bp) do { } while (0)
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#define XFS_BUF_UNBUSY(bp) do { } while (0)
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#define XFS_BUF_ISBUSY(bp) (1)
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#define XFS_BUF_ASYNC(bp) ((bp)->b_flags |= XBF_ASYNC)
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#define XFS_BUF_UNASYNC(bp) ((bp)->b_flags &= ~XBF_ASYNC)
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#define XFS_BUF_ISASYNC(bp) ((bp)->b_flags & XBF_ASYNC)
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#define XFS_BUF_ORDERED(bp) ((bp)->b_flags |= XBF_ORDERED)
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#define XFS_BUF_UNORDERED(bp) ((bp)->b_flags &= ~XBF_ORDERED)
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#define XFS_BUF_ISORDERED(bp) ((bp)->b_flags & XBF_ORDERED)
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#define XFS_BUF_HOLD(bp) xfs_buf_hold(bp)
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#define XFS_BUF_READ(bp) ((bp)->b_flags |= XBF_READ)
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#define XFS_BUF_UNREAD(bp) ((bp)->b_flags &= ~XBF_READ)
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#define XFS_BUF_ISREAD(bp) ((bp)->b_flags & XBF_READ)
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#define XFS_BUF_WRITE(bp) ((bp)->b_flags |= XBF_WRITE)
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#define XFS_BUF_UNWRITE(bp) ((bp)->b_flags &= ~XBF_WRITE)
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#define XFS_BUF_ISWRITE(bp) ((bp)->b_flags & XBF_WRITE)
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#define XFS_BUF_IODONE_FUNC(bp) ((bp)->b_iodone)
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#define XFS_BUF_SET_IODONE_FUNC(bp, func) ((bp)->b_iodone = (func))
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#define XFS_BUF_CLR_IODONE_FUNC(bp) ((bp)->b_iodone = NULL)
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#define XFS_BUF_FSPRIVATE(bp, type) ((type)(bp)->b_fspriv)
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#define XFS_BUF_SET_FSPRIVATE(bp, val) ((bp)->b_fspriv = (void*)(val))
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#define XFS_BUF_FSPRIVATE2(bp, type) ((type)(bp)->b_fspriv2)
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#define XFS_BUF_SET_FSPRIVATE2(bp, val) ((bp)->b_fspriv2 = (void*)(val))
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#define XFS_BUF_SET_START(bp) do { } while (0)
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#define XFS_BUF_SET_BRELSE_FUNC(bp, func) ((bp)->b_relse = (func))
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#define XFS_BUF_PTR(bp) (xfs_caddr_t)((bp)->b_addr)
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#define XFS_BUF_SET_PTR(bp, val, cnt) xfs_buf_associate_memory(bp, val, cnt)
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#define XFS_BUF_ADDR(bp) ((bp)->b_bn)
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#define XFS_BUF_SET_ADDR(bp, bno) ((bp)->b_bn = (xfs_daddr_t)(bno))
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#define XFS_BUF_OFFSET(bp) ((bp)->b_file_offset)
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#define XFS_BUF_SET_OFFSET(bp, off) ((bp)->b_file_offset = (off))
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#define XFS_BUF_COUNT(bp) ((bp)->b_count_desired)
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#define XFS_BUF_SET_COUNT(bp, cnt) ((bp)->b_count_desired = (cnt))
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#define XFS_BUF_SIZE(bp) ((bp)->b_buffer_length)
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#define XFS_BUF_SET_SIZE(bp, cnt) ((bp)->b_buffer_length = (cnt))
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#define XFS_BUF_SET_VTYPE_REF(bp, type, ref) do { } while (0)
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#define XFS_BUF_SET_VTYPE(bp, type) do { } while (0)
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#define XFS_BUF_SET_REF(bp, ref) do { } while (0)
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#define XFS_BUF_ISPINNED(bp) atomic_read(&((bp)->b_pin_count))
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#define XFS_BUF_VALUSEMA(bp) xfs_buf_lock_value(bp)
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#define XFS_BUF_CPSEMA(bp) (xfs_buf_cond_lock(bp) == 0)
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#define XFS_BUF_VSEMA(bp) xfs_buf_unlock(bp)
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#define XFS_BUF_PSEMA(bp,x) xfs_buf_lock(bp)
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#define XFS_BUF_FINISH_IOWAIT(bp) complete(&bp->b_iowait);
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#define XFS_BUF_SET_TARGET(bp, target) ((bp)->b_target = (target))
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#define XFS_BUF_TARGET(bp) ((bp)->b_target)
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#define XFS_BUFTARG_NAME(target) xfs_buf_target_name(target)
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static inline void xfs_buf_relse(xfs_buf_t *bp)
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{
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if (!bp->b_relse)
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xfs_buf_unlock(bp);
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xfs_buf_rele(bp);
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}
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#define xfs_biodone(bp) xfs_buf_ioend(bp, 0)
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#define xfs_biomove(bp, off, len, data, rw) \
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xfs_buf_iomove((bp), (off), (len), (data), \
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((rw) == XBF_WRITE) ? XBRW_WRITE : XBRW_READ)
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#define xfs_biozero(bp, off, len) \
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xfs_buf_iomove((bp), (off), (len), NULL, XBRW_ZERO)
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#define xfs_iowait(bp) xfs_buf_iowait(bp)
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#define xfs_baread(target, rablkno, ralen) \
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xfs_buf_readahead((target), (rablkno), (ralen), XBF_DONT_BLOCK)
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/*
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* Handling of buftargs.
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*/
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extern xfs_buftarg_t *xfs_alloc_buftarg(struct block_device *, int, const char *);
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extern void xfs_free_buftarg(struct xfs_mount *, struct xfs_buftarg *);
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extern void xfs_wait_buftarg(xfs_buftarg_t *);
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extern int xfs_setsize_buftarg(xfs_buftarg_t *, unsigned int, unsigned int);
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extern int xfs_flush_buftarg(xfs_buftarg_t *, int);
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#ifdef CONFIG_KDB_MODULES
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extern struct list_head *xfs_get_buftarg_list(void);
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#endif
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#define xfs_getsize_buftarg(buftarg) block_size((buftarg)->bt_bdev)
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#define xfs_readonly_buftarg(buftarg) bdev_read_only((buftarg)->bt_bdev)
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#define xfs_binval(buftarg) xfs_flush_buftarg(buftarg, 1)
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#define XFS_bflush(buftarg) xfs_flush_buftarg(buftarg, 1)
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#endif /* __XFS_BUF_H__ */
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