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Diffstat (limited to 'fs/xfs/libxfs/xfs_bmap.h')
| -rw-r--r-- | fs/xfs/libxfs/xfs_bmap.h | 188 |
1 files changed, 188 insertions, 0 deletions
diff --git a/fs/xfs/libxfs/xfs_bmap.h b/fs/xfs/libxfs/xfs_bmap.h new file mode 100644 index 000000000000..38ba36e9b2f0 --- /dev/null +++ b/fs/xfs/libxfs/xfs_bmap.h @@ -0,0 +1,188 @@ +/* + * 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; + +/* + * List of extents to be free "later". + * The list is kept sorted on xbf_startblock. + */ +typedef struct xfs_bmap_free_item +{ + xfs_fsblock_t xbfi_startblock;/* starting fs block number */ + xfs_extlen_t xbfi_blockcount;/* number of blocks in extent */ + struct xfs_bmap_free_item *xbfi_next; /* link to next entry */ +} xfs_bmap_free_item_t; + +/* + * Header for free extent list. + * + * xbf_low is used by the allocator to activate the lowspace algorithm - + * when free space is running low the extent allocator may choose to + * allocate an extent from an AG without leaving sufficient space for + * a btree split when inserting the new extent. In this case the allocator + * will enable the lowspace algorithm which is supposed to allow further + * allocations (such as btree splits and newroots) to allocate from + * sequential AGs. In order to avoid locking AGs out of order the lowspace + * algorithm will start searching for free space from AG 0. If the correct + * transaction reservations have been made then this algorithm will eventually + * find all the space it needs. + */ +typedef struct xfs_bmap_free +{ + xfs_bmap_free_item_t *xbf_first; /* list of to-be-free extents */ + int xbf_count; /* count of items on list */ + int xbf_low; /* alloc in low mode */ +} xfs_bmap_free_t; + +#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 +#define XFS_BMAPI_STACK_SWITCH 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_STACK_SWITCH, "STACK_SWITCH" } + + +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) + +static inline void xfs_bmap_init(xfs_bmap_free_t *flp, xfs_fsblock_t *fbp) +{ + ((flp)->xbf_first = NULL, (flp)->xbf_count = 0, \ + (flp)->xbf_low = 0, *(fbp) = NULLFSBLOCK); +} + +/* + * 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 + +#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(xfs_fsblock_t bno, xfs_filblks_t len, + struct xfs_bmap_free *flist, struct xfs_mount *mp); +void xfs_bmap_cancel(struct xfs_bmap_free *flist); +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_bmap_free *flist); +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_bmap_free *flist, 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, + int *done, xfs_fileoff_t start_fsb, + xfs_fileoff_t offset_shift_fsb, xfs_extnum_t *current_ext, + xfs_fsblock_t *firstblock, struct xfs_bmap_free *flist, + int num_exts); + +#endif /* __XFS_BMAP_H__ */ |