| /* |
| * Copyright (c) 2000-2006 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 __XFS_BMAP_H__ |
| #define __XFS_BMAP_H__ |
| |
| struct getbmap; |
| struct xfs_bmbt_irec; |
| struct xfs_ifork; |
| struct xfs_inode; |
| struct xfs_mount; |
| struct xfs_trans; |
| |
| extern kmem_zone_t *xfs_bmap_free_item_zone; |
| |
| /* |
| * Argument structure for xfs_bmap_alloc. |
| */ |
| struct xfs_bmalloca { |
| xfs_fsblock_t *firstblock; /* i/o first block allocated */ |
| struct xfs_defer_ops *dfops; /* bmap freelist */ |
| struct xfs_trans *tp; /* transaction pointer */ |
| struct xfs_inode *ip; /* incore inode pointer */ |
| struct xfs_bmbt_irec prev; /* extent before the new one */ |
| struct xfs_bmbt_irec got; /* extent after, or delayed */ |
| |
| xfs_fileoff_t offset; /* offset in file filling in */ |
| xfs_extlen_t length; /* i/o length asked/allocated */ |
| xfs_fsblock_t blkno; /* starting block of new extent */ |
| |
| struct xfs_btree_cur *cur; /* btree cursor */ |
| xfs_extnum_t idx; /* current extent index */ |
| int nallocs;/* number of extents alloc'd */ |
| int logflags;/* flags for transaction logging */ |
| |
| xfs_extlen_t total; /* total blocks needed for xaction */ |
| xfs_extlen_t minlen; /* minimum allocation size (blocks) */ |
| xfs_extlen_t minleft; /* amount must be left after alloc */ |
| bool eof; /* set if allocating past last extent */ |
| bool wasdel; /* replacing a delayed allocation */ |
| bool aeof; /* allocated space at eof */ |
| bool conv; /* overwriting unwritten extents */ |
| char userdata;/* userdata mask */ |
| int flags; |
| }; |
| |
| /* |
| * List of extents to be free "later". |
| * The list is kept sorted on xbf_startblock. |
| */ |
| struct xfs_extent_free_item |
| { |
| xfs_fsblock_t xefi_startblock;/* starting fs block number */ |
| xfs_extlen_t xefi_blockcount;/* number of blocks in extent */ |
| struct list_head xefi_list; |
| struct xfs_owner_info xefi_oinfo; /* extent owner */ |
| }; |
| |
| #define XFS_BMAP_MAX_NMAP 4 |
| |
| /* |
| * Flags for xfs_bmapi_* |
| */ |
| #define XFS_BMAPI_ENTIRE 0x001 /* return entire extent, not trimmed */ |
| #define XFS_BMAPI_METADATA 0x002 /* mapping metadata not user data */ |
| #define XFS_BMAPI_ATTRFORK 0x004 /* use attribute fork not data */ |
| #define XFS_BMAPI_PREALLOC 0x008 /* preallocation op: unwritten space */ |
| #define XFS_BMAPI_IGSTATE 0x010 /* Ignore state - */ |
| /* combine contig. space */ |
| #define XFS_BMAPI_CONTIG 0x020 /* must allocate only one extent */ |
| /* |
| * unwritten extent conversion - this needs write cache flushing and no additional |
| * allocation alignments. When specified with XFS_BMAPI_PREALLOC it converts |
| * from written to unwritten, otherwise convert from unwritten to written. |
| */ |
| #define XFS_BMAPI_CONVERT 0x040 |
| |
| /* |
| * allocate zeroed extents - this requires all newly allocated user data extents |
| * to be initialised to zero. It will be ignored if XFS_BMAPI_METADATA is set. |
| * Use in conjunction with XFS_BMAPI_CONVERT to convert unwritten extents found |
| * during the allocation range to zeroed written extents. |
| */ |
| #define XFS_BMAPI_ZERO 0x080 |
| |
| #define XFS_BMAPI_FLAGS \ |
| { XFS_BMAPI_ENTIRE, "ENTIRE" }, \ |
| { XFS_BMAPI_METADATA, "METADATA" }, \ |
| { XFS_BMAPI_ATTRFORK, "ATTRFORK" }, \ |
| { XFS_BMAPI_PREALLOC, "PREALLOC" }, \ |
| { XFS_BMAPI_IGSTATE, "IGSTATE" }, \ |
| { XFS_BMAPI_CONTIG, "CONTIG" }, \ |
| { XFS_BMAPI_CONVERT, "CONVERT" }, \ |
| { XFS_BMAPI_ZERO, "ZERO" } |
| |
| |
| static inline int xfs_bmapi_aflag(int w) |
| { |
| return (w == XFS_ATTR_FORK ? XFS_BMAPI_ATTRFORK : 0); |
| } |
| |
| /* |
| * Special values for xfs_bmbt_irec_t br_startblock field. |
| */ |
| #define DELAYSTARTBLOCK ((xfs_fsblock_t)-1LL) |
| #define HOLESTARTBLOCK ((xfs_fsblock_t)-2LL) |
| |
| /* |
| * Flags for xfs_bmap_add_extent*. |
| */ |
| #define BMAP_LEFT_CONTIG (1 << 0) |
| #define BMAP_RIGHT_CONTIG (1 << 1) |
| #define BMAP_LEFT_FILLING (1 << 2) |
| #define BMAP_RIGHT_FILLING (1 << 3) |
| #define BMAP_LEFT_DELAY (1 << 4) |
| #define BMAP_RIGHT_DELAY (1 << 5) |
| #define BMAP_LEFT_VALID (1 << 6) |
| #define BMAP_RIGHT_VALID (1 << 7) |
| #define BMAP_ATTRFORK (1 << 8) |
| |
| #define XFS_BMAP_EXT_FLAGS \ |
| { BMAP_LEFT_CONTIG, "LC" }, \ |
| { BMAP_RIGHT_CONTIG, "RC" }, \ |
| { BMAP_LEFT_FILLING, "LF" }, \ |
| { BMAP_RIGHT_FILLING, "RF" }, \ |
| { BMAP_ATTRFORK, "ATTR" } |
| |
| |
| /* |
| * This macro is used to determine how many extents will be shifted |
| * in one write transaction. We could require two splits, |
| * an extent move on the first and an extent merge on the second, |
| * So it is proper that one extent is shifted inside write transaction |
| * at a time. |
| */ |
| #define XFS_BMAP_MAX_SHIFT_EXTENTS 1 |
| |
| enum shift_direction { |
| SHIFT_LEFT = 0, |
| SHIFT_RIGHT, |
| }; |
| |
| #ifdef DEBUG |
| void xfs_bmap_trace_exlist(struct xfs_inode *ip, xfs_extnum_t cnt, |
| int whichfork, unsigned long caller_ip); |
| #define XFS_BMAP_TRACE_EXLIST(ip,c,w) \ |
| xfs_bmap_trace_exlist(ip,c,w, _THIS_IP_) |
| #else |
| #define XFS_BMAP_TRACE_EXLIST(ip,c,w) |
| #endif |
| |
| int xfs_bmap_add_attrfork(struct xfs_inode *ip, int size, int rsvd); |
| void xfs_bmap_local_to_extents_empty(struct xfs_inode *ip, int whichfork); |
| void xfs_bmap_add_free(struct xfs_mount *mp, struct xfs_defer_ops *dfops, |
| xfs_fsblock_t bno, xfs_filblks_t len, |
| struct xfs_owner_info *oinfo); |
| void xfs_bmap_compute_maxlevels(struct xfs_mount *mp, int whichfork); |
| int xfs_bmap_first_unused(struct xfs_trans *tp, struct xfs_inode *ip, |
| xfs_extlen_t len, xfs_fileoff_t *unused, int whichfork); |
| int xfs_bmap_last_before(struct xfs_trans *tp, struct xfs_inode *ip, |
| xfs_fileoff_t *last_block, int whichfork); |
| int xfs_bmap_last_offset(struct xfs_inode *ip, xfs_fileoff_t *unused, |
| int whichfork); |
| int xfs_bmap_one_block(struct xfs_inode *ip, int whichfork); |
| int xfs_bmap_read_extents(struct xfs_trans *tp, struct xfs_inode *ip, |
| int whichfork); |
| int xfs_bmapi_read(struct xfs_inode *ip, xfs_fileoff_t bno, |
| xfs_filblks_t len, struct xfs_bmbt_irec *mval, |
| int *nmap, int flags); |
| int xfs_bmapi_delay(struct xfs_inode *ip, xfs_fileoff_t bno, |
| xfs_filblks_t len, struct xfs_bmbt_irec *mval, |
| int *nmap, int flags); |
| int xfs_bmapi_write(struct xfs_trans *tp, struct xfs_inode *ip, |
| xfs_fileoff_t bno, xfs_filblks_t len, int flags, |
| xfs_fsblock_t *firstblock, xfs_extlen_t total, |
| struct xfs_bmbt_irec *mval, int *nmap, |
| struct xfs_defer_ops *dfops); |
| int xfs_bunmapi(struct xfs_trans *tp, struct xfs_inode *ip, |
| xfs_fileoff_t bno, xfs_filblks_t len, int flags, |
| xfs_extnum_t nexts, xfs_fsblock_t *firstblock, |
| struct xfs_defer_ops *dfops, int *done); |
| int xfs_check_nostate_extents(struct xfs_ifork *ifp, xfs_extnum_t idx, |
| xfs_extnum_t num); |
| uint xfs_default_attroffset(struct xfs_inode *ip); |
| int xfs_bmap_shift_extents(struct xfs_trans *tp, struct xfs_inode *ip, |
| xfs_fileoff_t *next_fsb, xfs_fileoff_t offset_shift_fsb, |
| int *done, xfs_fileoff_t stop_fsb, xfs_fsblock_t *firstblock, |
| struct xfs_defer_ops *dfops, enum shift_direction direction, |
| int num_exts); |
| int xfs_bmap_split_extent(struct xfs_inode *ip, xfs_fileoff_t split_offset); |
| |
| #endif /* __XFS_BMAP_H__ */ |