| /* |
| * Copyright (c) 2000-2005 Silicon Graphics, Inc. |
| * All Rights Reserved. |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License as |
| * published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it would be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #ifndef __LIBXFS_IO_H_ |
| #define __LIBXFS_IO_H_ |
| |
| /* |
| * Kernel equivalent buffer based I/O interface |
| */ |
| |
| struct xfs_buf; |
| struct xfs_mount; |
| struct xfs_perag; |
| |
| /* |
| * IO verifier callbacks need the xfs_mount pointer, so we have to behave |
| * somewhat like the kernel now for userspace IO in terms of having buftarg |
| * based devices... |
| */ |
| struct xfs_buftarg { |
| struct xfs_mount *bt_mount; |
| dev_t dev; |
| }; |
| |
| extern void libxfs_buftarg_init(struct xfs_mount *mp, dev_t ddev, |
| dev_t logdev, dev_t rtdev); |
| |
| #define LIBXFS_BBTOOFF64(bbs) (((xfs_off_t)(bbs)) << BBSHIFT) |
| |
| #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; |
| void (*verify_read)(struct xfs_buf *); |
| void (*verify_write)(struct xfs_buf *); |
| }; |
| |
| typedef struct xfs_buf { |
| struct cache_node b_node; |
| unsigned int b_flags; |
| xfs_daddr_t b_bn; |
| unsigned b_bcount; |
| unsigned int b_length; |
| struct xfs_buftarg *b_target; |
| #define b_dev b_target->dev |
| pthread_mutex_t b_lock; |
| pthread_t b_holder; |
| unsigned int b_recur; |
| void *b_fspriv; |
| void *b_fsprivate2; |
| void *b_fsprivate3; |
| void *b_addr; |
| int b_error; |
| const struct xfs_buf_ops *b_ops; |
| struct xfs_perag *b_pag; |
| struct xfs_buf_map *b_maps; |
| int b_nmaps; |
| #ifdef XFS_BUF_TRACING |
| struct list_head b_lock_list; |
| const char *b_func; |
| const char *b_file; |
| int b_line; |
| #endif |
| } xfs_buf_t; |
| |
| enum xfs_buf_flags_t { /* b_flags bits */ |
| LIBXFS_B_EXIT = 0x0001, /* ==LIBXFS_EXIT_ON_FAILURE */ |
| LIBXFS_B_DIRTY = 0x0002, /* buffer has been modified */ |
| LIBXFS_B_STALE = 0x0004, /* buffer marked as invalid */ |
| LIBXFS_B_UPTODATE = 0x0008, /* buffer is sync'd to disk */ |
| LIBXFS_B_DISCONTIG = 0x0010, /* discontiguous buffer */ |
| LIBXFS_B_UNCHECKED = 0x0020, /* needs verification */ |
| }; |
| |
| #define XFS_BUF_DADDR_NULL ((xfs_daddr_t) (-1LL)) |
| |
| #define XFS_BUF_PTR(bp) ((char *)(bp)->b_addr) |
| #define xfs_buf_offset(bp, offset) ((bp)->b_addr + (offset)) |
| #define XFS_BUF_ADDR(bp) ((bp)->b_bn) |
| #define XFS_BUF_SIZE(bp) ((bp)->b_bcount) |
| #define XFS_BUF_COUNT(bp) ((bp)->b_bcount) |
| #define XFS_BUF_TARGET(bp) ((bp)->b_dev) |
| #define XFS_BUF_SET_PTR(bp,p,cnt) ({ \ |
| (bp)->b_addr = (char *)(p); \ |
| XFS_BUF_SET_COUNT(bp,cnt); \ |
| }) |
| |
| #define XFS_BUF_SET_ADDR(bp,blk) ((bp)->b_bn = (blk)) |
| #define XFS_BUF_SET_COUNT(bp,cnt) ((bp)->b_bcount = (cnt)) |
| |
| #define XFS_BUF_FSPRIVATE(bp,type) ((type)(bp)->b_fspriv) |
| #define XFS_BUF_SET_FSPRIVATE(bp,val) (bp)->b_fspriv = (void *)(val) |
| #define XFS_BUF_FSPRIVATE2(bp,type) ((type)(bp)->b_fsprivate2) |
| #define XFS_BUF_SET_FSPRIVATE2(bp,val) (bp)->b_fsprivate2 = (void *)(val) |
| #define XFS_BUF_FSPRIVATE3(bp,type) ((type)(bp)->b_fsprivate3) |
| #define XFS_BUF_SET_FSPRIVATE3(bp,val) (bp)->b_fsprivate3 = (void *)(val) |
| |
| #define XFS_BUF_SET_PRIORITY(bp,pri) cache_node_set_priority( \ |
| libxfs_bcache, \ |
| (struct cache_node *)(bp), \ |
| (pri)) |
| #define XFS_BUF_PRIORITY(bp) (cache_node_get_priority( \ |
| (struct cache_node *)(bp))) |
| #define xfs_buf_set_ref(bp,ref) ((void) 0) |
| #define xfs_buf_ioerror(bp,err) ((bp)->b_error = (err)) |
| |
| #define xfs_daddr_to_agno(mp,d) \ |
| ((xfs_agnumber_t)(XFS_BB_TO_FSBT(mp, d) / (mp)->m_sb.sb_agblocks)) |
| #define xfs_daddr_to_agbno(mp,d) \ |
| ((xfs_agblock_t)(XFS_BB_TO_FSBT(mp, d) % (mp)->m_sb.sb_agblocks)) |
| |
| /* Buffer Cache Interfaces */ |
| |
| extern struct cache *libxfs_bcache; |
| extern struct cache_operations libxfs_bcache_operations; |
| |
| #define LIBXFS_GETBUF_TRYLOCK (1 << 0) |
| |
| #ifdef XFS_BUF_TRACING |
| |
| #define libxfs_readbuf(dev, daddr, len, flags, ops) \ |
| libxfs_trace_readbuf(__FUNCTION__, __FILE__, __LINE__, \ |
| (dev), (daddr), (len), (flags), (ops)) |
| #define libxfs_readbuf_map(dev, map, nmaps, flags, ops) \ |
| libxfs_trace_readbuf_map(__FUNCTION__, __FILE__, __LINE__, \ |
| (dev), (map), (nmaps), (flags), (ops)) |
| #define libxfs_writebuf(buf, flags) \ |
| libxfs_trace_writebuf(__FUNCTION__, __FILE__, __LINE__, \ |
| (buf), (flags)) |
| #define libxfs_getbuf(dev, daddr, len) \ |
| libxfs_trace_getbuf(__FUNCTION__, __FILE__, __LINE__, \ |
| (dev), (daddr), (len)) |
| #define libxfs_getbuf_map(dev, map, nmaps, flags) \ |
| libxfs_trace_getbuf_map(__FUNCTION__, __FILE__, __LINE__, \ |
| (dev), (map), (nmaps), (flags)) |
| #define libxfs_getbuf_flags(dev, daddr, len, flags) \ |
| libxfs_trace_getbuf_flags(__FUNCTION__, __FILE__, __LINE__, \ |
| (dev), (daddr), (len), (flags)) |
| #define libxfs_putbuf(buf) \ |
| libxfs_trace_putbuf(__FUNCTION__, __FILE__, __LINE__, (buf)) |
| |
| extern xfs_buf_t *libxfs_trace_readbuf(const char *, const char *, int, |
| struct xfs_buftarg *, xfs_daddr_t, int, int, |
| const struct xfs_buf_ops *); |
| extern xfs_buf_t *libxfs_trace_readbuf_map(const char *, const char *, int, |
| struct xfs_buftarg *, struct xfs_buf_map *, int, int, |
| const struct xfs_buf_ops *); |
| extern int libxfs_trace_writebuf(const char *, const char *, int, |
| xfs_buf_t *, int); |
| extern xfs_buf_t *libxfs_trace_getbuf(const char *, const char *, int, |
| struct xfs_buftarg *, xfs_daddr_t, int); |
| extern xfs_buf_t *libxfs_trace_getbuf_map(const char *, const char *, int, |
| struct xfs_buftarg *, struct xfs_buf_map *, int, int); |
| extern xfs_buf_t *libxfs_trace_getbuf_flags(const char *, const char *, int, |
| struct xfs_buftarg *, xfs_daddr_t, int, unsigned int); |
| extern void libxfs_trace_putbuf (const char *, const char *, int, |
| xfs_buf_t *); |
| |
| #else |
| |
| extern xfs_buf_t *libxfs_readbuf(struct xfs_buftarg *, xfs_daddr_t, int, int, |
| const struct xfs_buf_ops *); |
| extern xfs_buf_t *libxfs_readbuf_map(struct xfs_buftarg *, struct xfs_buf_map *, |
| int, int, const struct xfs_buf_ops *); |
| extern int libxfs_writebuf(xfs_buf_t *, int); |
| extern xfs_buf_t *libxfs_getbuf(struct xfs_buftarg *, xfs_daddr_t, int); |
| extern xfs_buf_t *libxfs_getbuf_map(struct xfs_buftarg *, |
| struct xfs_buf_map *, int, int); |
| extern xfs_buf_t *libxfs_getbuf_flags(struct xfs_buftarg *, xfs_daddr_t, |
| int, unsigned int); |
| extern void libxfs_putbuf (xfs_buf_t *); |
| |
| #endif |
| |
| extern void libxfs_readbuf_verify(struct xfs_buf *bp, |
| const struct xfs_buf_ops *ops); |
| extern xfs_buf_t *libxfs_getsb(struct xfs_mount *, int); |
| extern void libxfs_bcache_purge(void); |
| extern void libxfs_bcache_flush(void); |
| extern void libxfs_purgebuf(xfs_buf_t *); |
| extern int libxfs_bcache_overflowed(void); |
| extern int libxfs_bcache_usage(void); |
| |
| /* Buffer (Raw) Interfaces */ |
| extern xfs_buf_t *libxfs_getbufr(struct xfs_buftarg *, xfs_daddr_t, int); |
| extern void libxfs_putbufr(xfs_buf_t *); |
| |
| extern int libxfs_writebuf_int(xfs_buf_t *, int); |
| extern int libxfs_writebufr(struct xfs_buf *); |
| extern int libxfs_readbufr(struct xfs_buftarg *, xfs_daddr_t, xfs_buf_t *, int, int); |
| extern int libxfs_readbufr_map(struct xfs_buftarg *, struct xfs_buf *, int); |
| |
| extern int libxfs_device_zero(struct xfs_buftarg *, xfs_daddr_t, uint); |
| |
| extern int libxfs_bhash_size; |
| |
| #define LIBXFS_BREAD 0x1 |
| #define LIBXFS_BWRITE 0x2 |
| #define LIBXFS_BZERO 0x4 |
| |
| extern void libxfs_iomove (xfs_buf_t *, uint, int, void *, int); |
| |
| 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); |
| } |
| |
| #endif /* __LIBXFS_IO_H__ */ |