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fs/xfs/xfs_bmap.h
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/* |
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* Copyright (c) 2000-2006 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 * 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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* 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. |
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* |
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* 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 |
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*/ #ifndef __XFS_BMAP_H__ #define __XFS_BMAP_H__ struct getbmap; struct xfs_bmbt_irec; |
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struct xfs_ifork; |
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struct xfs_inode; struct xfs_mount; struct xfs_trans; |
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extern kmem_zone_t *xfs_bmap_free_item_zone; |
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/* * 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. |
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* * 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. |
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*/ 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 */ |
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int xbf_low; /* alloc in low mode */ |
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} xfs_bmap_free_t; #define XFS_BMAP_MAX_NMAP 4 /* |
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* Flags for xfs_bmapi_* |
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*/ |
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#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 - */ |
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/* combine contig. space */ |
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#define XFS_BMAPI_CONTIG 0x020 /* must allocate only one extent */ |
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/* * 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. */ |
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#define XFS_BMAPI_CONVERT 0x040 |
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#define XFS_BMAPI_FLAGS \ |
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{ XFS_BMAPI_ENTIRE, "ENTIRE" }, \ { XFS_BMAPI_METADATA, "METADATA" }, \ |
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{ XFS_BMAPI_ATTRFORK, "ATTRFORK" }, \ |
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{ XFS_BMAPI_PREALLOC, "PREALLOC" }, \ { XFS_BMAPI_IGSTATE, "IGSTATE" }, \ { XFS_BMAPI_CONTIG, "CONTIG" }, \ { XFS_BMAPI_CONVERT, "CONVERT" } |
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static inline int xfs_bmapi_aflag(int w) { return (w == XFS_ATTR_FORK ? XFS_BMAPI_ATTRFORK : 0); } |
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/* * Special values for xfs_bmbt_irec_t br_startblock field. */ #define DELAYSTARTBLOCK ((xfs_fsblock_t)-1LL) #define HOLESTARTBLOCK ((xfs_fsblock_t)-2LL) |
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static inline void xfs_bmap_init(xfs_bmap_free_t *flp, xfs_fsblock_t *fbp) { |
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((flp)->xbf_first = NULL, (flp)->xbf_count = 0, \ |
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(flp)->xbf_low = 0, *(fbp) = NULLFSBLOCK); } |
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/* * Argument structure for xfs_bmap_alloc. */ typedef struct xfs_bmalloca { |
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xfs_fsblock_t *firstblock; /* i/o first block allocated */ struct xfs_bmap_free *flist; /* bmap freelist */ |
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struct xfs_trans *tp; /* transaction pointer */ struct xfs_inode *ip; /* incore inode pointer */ |
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struct xfs_bmbt_irec prev; /* extent before the new one */ struct xfs_bmbt_irec got; /* extent after, or delayed */ |
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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 */ |
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struct xfs_btree_cur *cur; /* btree cursor */ |
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xfs_extnum_t idx; /* current extent index */ int nallocs;/* number of extents alloc'd */ |
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int logflags;/* flags for transaction logging */ |
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xfs_extlen_t total; /* total blocks needed for xaction */ |
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xfs_extlen_t minlen; /* minimum allocation size (blocks) */ |
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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 */ |
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char aeof; /* allocated space at eof */ char conv; /* overwriting unwritten extents */ |
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} xfs_bmalloca_t; |
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/* * 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) |
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#define BMAP_ATTRFORK (1 << 8) |
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#define XFS_BMAP_EXT_FLAGS \ { BMAP_LEFT_CONTIG, "LC" }, \ { BMAP_RIGHT_CONTIG, "RC" }, \ { BMAP_LEFT_FILLING, "LF" }, \ { BMAP_RIGHT_FILLING, "RF" }, \ { BMAP_ATTRFORK, "ATTR" } |
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#if defined(__KERNEL) && defined(DEBUG) |
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void xfs_bmap_trace_exlist(struct xfs_inode *ip, xfs_extnum_t cnt, int whichfork, unsigned long caller_ip); |
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#define XFS_BMAP_TRACE_EXLIST(ip,c,w) \ |
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xfs_bmap_trace_exlist(ip,c,w, _THIS_IP_) #else |
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#define XFS_BMAP_TRACE_EXLIST(ip,c,w) |
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#endif |
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int xfs_bmap_add_attrfork(struct xfs_inode *ip, int size, int rsvd); 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_trans *tp, 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); |
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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); |
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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); |
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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); |
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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); |
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#ifdef __KERNEL__ |
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/* bmap to userspace formatter - copy to user & advance pointer */ typedef int (*xfs_bmap_format_t)(void **, struct getbmapx *, int *); |
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int xfs_bmap_finish(struct xfs_trans **tp, struct xfs_bmap_free *flist, int *committed); int xfs_getbmap(struct xfs_inode *ip, struct getbmapx *bmv, xfs_bmap_format_t formatter, void *arg); int xfs_bmap_eof(struct xfs_inode *ip, xfs_fileoff_t endoff, int whichfork, int *eof); int xfs_bmap_count_blocks(struct xfs_trans *tp, struct xfs_inode *ip, int whichfork, int *count); int xfs_bmap_punch_delalloc_range(struct xfs_inode *ip, xfs_fileoff_t start_fsb, xfs_fileoff_t length); |
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#endif /* __KERNEL__ */ #endif /* __XFS_BMAP_H__ */ |