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/* * Copyright (c) 2000-2003,2005 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 __XFS_BMAP_H__ #define __XFS_BMAP_H__ struct getbmap; struct xfs_bmbt_irec; struct xfs_inode; struct xfs_mount; struct xfs_trans; /* * 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. */ 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; /* kludge: alloc in low mode */ } xfs_bmap_free_t; #define XFS_BMAP_MAX_NMAP 4 /* * Flags for xfs_bmapi */ #define XFS_BMAPI_WRITE 0x001 /* write operation: allocate space */ #define XFS_BMAPI_DELAY 0x002 /* delayed write operation */ #define XFS_BMAPI_ENTIRE 0x004 /* return entire extent, not trimmed */ #define XFS_BMAPI_METADATA 0x008 /* mapping metadata not user data */ #define XFS_BMAPI_EXACT 0x010 /* allocate only to spec'd bounds */ #define XFS_BMAPI_ATTRFORK 0x020 /* use attribute fork not data */ #define XFS_BMAPI_ASYNC 0x040 /* bunmapi xactions can be async */ #define XFS_BMAPI_RSVBLOCKS 0x080 /* OK to alloc. reserved data blocks */ #define XFS_BMAPI_PREALLOC 0x100 /* preallocation op: unwritten space */ #define XFS_BMAPI_IGSTATE 0x200 /* Ignore state - */ /* combine contig. space */ #define XFS_BMAPI_CONTIG 0x400 /* must allocate only one extent */ /* XFS_BMAPI_DIRECT_IO 0x800 */ #define XFS_BMAPI_CONVERT 0x1000 /* unwritten extent conversion - */ /* need write cache flushing and no */ /* additional allocation alignments */ #define XFS_BMAPI_AFLAG(w) xfs_bmapi_aflag(w) 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) #define XFS_BMAP_INIT(flp,fbp) xfs_bmap_init(flp,fbp) 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); } /* * Argument structure for xfs_bmap_alloc. */ typedef struct xfs_bmalloca { xfs_fsblock_t firstblock; /* i/o first block allocated */ xfs_fsblock_t rval; /* starting block of new extent */ xfs_fileoff_t off; /* offset in file filling in */ struct xfs_trans *tp; /* transaction pointer */ struct xfs_inode *ip; /* incore inode pointer */ struct xfs_bmbt_irec *prevp; /* extent before the new one */ struct xfs_bmbt_irec *gotp; /* extent after, or delayed */ xfs_extlen_t alen; /* i/o length asked/allocated */ xfs_extlen_t total; /* total blocks needed for xaction */ xfs_extlen_t minlen; /* mininum allocation size (blocks) */ xfs_extlen_t minleft; /* amount must be left after alloc */ char eof; /* set if allocating past last extent */ char wasdel; /* replacing a delayed allocation */ char userdata;/* set if is user data */ char low; /* low on space, using seq'l ags */ char aeof; /* allocated space at eof */ char conv; /* overwriting unwritten extents */ } xfs_bmalloca_t; #ifdef __KERNEL__ #if defined(XFS_BMAP_TRACE) /* * Trace operations for bmap extent tracing */ #define XFS_BMAP_KTRACE_DELETE 1 #define XFS_BMAP_KTRACE_INSERT 2 #define XFS_BMAP_KTRACE_PRE_UP 3 #define XFS_BMAP_KTRACE_POST_UP 4 #define XFS_BMAP_TRACE_SIZE 4096 /* size of global trace buffer */ #define XFS_BMAP_KTRACE_SIZE 32 /* size of per-inode trace buffer */ extern ktrace_t *xfs_bmap_trace_buf; /* * Add bmap trace insert entries for all the contents of the extent list. */ void xfs_bmap_trace_exlist( char *fname, /* function name */ struct xfs_inode *ip, /* incore inode pointer */ xfs_extnum_t cnt, /* count of entries in list */ int whichfork); /* data or attr fork */ #else #define xfs_bmap_trace_exlist(f,ip,c,w) #endif /* * Convert inode from non-attributed to attributed. * Must not be in a transaction, ip must not be locked. */ int /* error code */ xfs_bmap_add_attrfork( struct xfs_inode *ip, /* incore inode pointer */ int size, /* space needed for new attribute */ int rsvd); /* flag for reserved block allocation */ /* * Add the extent to the list of extents to be free at transaction end. * The list is maintained sorted (by block number). */ void xfs_bmap_add_free( xfs_fsblock_t bno, /* fs block number of extent */ xfs_filblks_t len, /* length of extent */ xfs_bmap_free_t *flist, /* list of extents */ struct xfs_mount *mp); /* mount point structure */ /* * Routine to clean up the free list data structure when * an error occurs during a transaction. */ void xfs_bmap_cancel( xfs_bmap_free_t *flist); /* free list to clean up */ /* * Compute and fill in the value of the maximum depth of a bmap btree * in this filesystem. Done once, during mount. */ void xfs_bmap_compute_maxlevels( struct xfs_mount *mp, /* file system mount structure */ int whichfork); /* data or attr fork */ /* * Routine to be called at transaction's end by xfs_bmapi, xfs_bunmapi * caller. Frees all the extents that need freeing, which must be done * last due to locking considerations. * * Return 1 if the given transaction was committed and a new one allocated, * and 0 otherwise. */ int /* error */ xfs_bmap_finish( struct xfs_trans **tp, /* transaction pointer addr */ xfs_bmap_free_t *flist, /* i/o: list extents to free */ xfs_fsblock_t firstblock, /* controlled a.g. for allocs */ int *committed); /* xact committed or not */ /* * Returns the file-relative block number of the first unused block in the file. * This is the lowest-address hole if the file has holes, else the first block * past the end of file. */ int /* error */ xfs_bmap_first_unused( struct xfs_trans *tp, /* transaction pointer */ struct xfs_inode *ip, /* incore inode */ xfs_extlen_t len, /* size of hole to find */ xfs_fileoff_t *unused, /* unused block num */ int whichfork); /* data or attr fork */ /* * Returns the file-relative block number of the last block + 1 before * last_block (input value) in the file. * This is not based on i_size, it is based on the extent list. * Returns 0 for local files, as they do not have an extent list. */ int /* error */ xfs_bmap_last_before( struct xfs_trans *tp, /* transaction pointer */ struct xfs_inode *ip, /* incore inode */ xfs_fileoff_t *last_block, /* last block */ int whichfork); /* data or attr fork */ /* * Returns the file-relative block number of the first block past eof in * the file. This is not based on i_size, it is based on the extent list. * Returns 0 for local files, as they do not have an extent list. */ int /* error */ xfs_bmap_last_offset( struct xfs_trans *tp, /* transaction pointer */ struct xfs_inode *ip, /* incore inode */ xfs_fileoff_t *unused, /* last block num */ int whichfork); /* data or attr fork */ /* * Returns whether the selected fork of the inode has exactly one * block or not. For the data fork we check this matches di_size, * implying the file's range is 0..bsize-1. */ int xfs_bmap_one_block( struct xfs_inode *ip, /* incore inode */ int whichfork); /* data or attr fork */ /* * Read in the extents to iu_extents. * All inode fields are set up by caller, we just traverse the btree * and copy the records in. */ int /* error */ xfs_bmap_read_extents( struct xfs_trans *tp, /* transaction pointer */ struct xfs_inode *ip, /* incore inode */ int whichfork); /* data or attr fork */ /* * Map file blocks to filesystem blocks. * File range is given by the bno/len pair. * Adds blocks to file if a write ("flags & XFS_BMAPI_WRITE" set) * into a hole or past eof. * Only allocates blocks from a single allocation group, * to avoid locking problems. * The returned value in "firstblock" from the first call in a transaction * must be remembered and presented to subsequent calls in "firstblock". * An upper bound for the number of blocks to be allocated is supplied to * the first call in "total"; if no allocation group has that many free * blocks then the call will fail (return NULLFSBLOCK in "firstblock"). */ int /* error */ xfs_bmapi( struct xfs_trans *tp, /* transaction pointer */ struct xfs_inode *ip, /* incore inode */ xfs_fileoff_t bno, /* starting file offs. mapped */ xfs_filblks_t len, /* length to map in file */ int flags, /* XFS_BMAPI_... */ xfs_fsblock_t *firstblock, /* first allocated block controls a.g. for allocs */ xfs_extlen_t total, /* total blocks needed */ struct xfs_bmbt_irec *mval, /* output: map values */ int *nmap, /* i/o: mval size/count */ xfs_bmap_free_t *flist); /* i/o: list extents to free */ /* * Map file blocks to filesystem blocks, simple version. * One block only, read-only. * For flags, only the XFS_BMAPI_ATTRFORK flag is examined. * For the other flag values, the effect is as if XFS_BMAPI_METADATA * was set and all the others were clear. */ int /* error */ xfs_bmapi_single( struct xfs_trans *tp, /* transaction pointer */ struct xfs_inode *ip, /* incore inode */ int whichfork, /* data or attr fork */ xfs_fsblock_t *fsb, /* output: mapped block */ xfs_fileoff_t bno); /* starting file offs. mapped */ /* * Unmap (remove) blocks from a file. * If nexts is nonzero then the number of extents to remove is limited to * that value. If not all extents in the block range can be removed then * *done is set. */ int /* error */ xfs_bunmapi( struct xfs_trans *tp, /* transaction pointer */ struct xfs_inode *ip, /* incore inode */ xfs_fileoff_t bno, /* starting offset to unmap */ xfs_filblks_t len, /* length to unmap in file */ int flags, /* XFS_BMAPI_... */ xfs_extnum_t nexts, /* number of extents max */ xfs_fsblock_t *firstblock, /* first allocated block controls a.g. for allocs */ xfs_bmap_free_t *flist, /* i/o: list extents to free */ int *done); /* set if not done yet */ /* * Fcntl interface to xfs_bmapi. */ int /* error code */ xfs_getbmap( bhv_desc_t *bdp, /* XFS behavior descriptor*/ struct getbmap *bmv, /* user bmap structure */ void __user *ap, /* pointer to user's array */ int iflags); /* interface flags */ /* * Check if the endoff is outside the last extent. If so the caller will grow * the allocation to a stripe unit boundary */ int xfs_bmap_eof( struct xfs_inode *ip, xfs_fileoff_t endoff, int whichfork, int *eof); /* * Count fsblocks of the given fork. */ int xfs_bmap_count_blocks( xfs_trans_t *tp, struct xfs_inode *ip, int whichfork, int *count); /* * Check an extent list, which has just been read, for * any bit in the extent flag field. */ int xfs_check_nostate_extents( xfs_bmbt_rec_t *ep, xfs_extnum_t num); #endif /* __KERNEL__ */ #endif /* __XFS_BMAP_H__ */