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281 lines
9.9 KiB
281 lines
9.9 KiB
/*
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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
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* 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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*
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* This program is distributed in the hope that it would be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* 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
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* along with this program; if not, write the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef __XFS_BMAP_H__
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#define __XFS_BMAP_H__
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struct getbmap;
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struct xfs_bmbt_irec;
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struct xfs_ifork;
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struct xfs_inode;
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struct xfs_mount;
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struct xfs_trans;
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extern kmem_zone_t *xfs_bmap_free_item_zone;
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/*
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* Argument structure for xfs_bmap_alloc.
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*/
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struct xfs_bmalloca {
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xfs_fsblock_t *firstblock; /* i/o first block allocated */
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struct xfs_defer_ops *dfops; /* bmap freelist */
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struct xfs_trans *tp; /* transaction pointer */
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struct xfs_inode *ip; /* incore inode pointer */
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struct xfs_bmbt_irec prev; /* extent before the new one */
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struct xfs_bmbt_irec got; /* extent after, or delayed */
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xfs_fileoff_t offset; /* offset in file filling in */
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xfs_extlen_t length; /* i/o length asked/allocated */
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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 */
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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 */
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bool eof; /* set if allocating past last extent */
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bool wasdel; /* replacing a delayed allocation */
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bool aeof; /* allocated space at eof */
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bool conv; /* overwriting unwritten extents */
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int datatype;/* data type being allocated */
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int flags;
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};
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/*
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* List of extents to be free "later".
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* The list is kept sorted on xbf_startblock.
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*/
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struct xfs_extent_free_item
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{
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xfs_fsblock_t xefi_startblock;/* starting fs block number */
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xfs_extlen_t xefi_blockcount;/* number of blocks in extent */
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struct list_head xefi_list;
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struct xfs_owner_info xefi_oinfo; /* extent owner */
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};
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#define XFS_BMAP_MAX_NMAP 4
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/*
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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 */
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#define XFS_BMAPI_METADATA 0x002 /* mapping metadata not user data */
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#define XFS_BMAPI_ATTRFORK 0x004 /* use attribute fork not data */
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#define XFS_BMAPI_PREALLOC 0x008 /* preallocation op: unwritten space */
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#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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/*
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* unwritten extent conversion - this needs write cache flushing and no additional
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* allocation alignments. When specified with XFS_BMAPI_PREALLOC it converts
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* from written to unwritten, otherwise convert from unwritten to written.
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*/
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#define XFS_BMAPI_CONVERT 0x040
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/*
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* allocate zeroed extents - this requires all newly allocated user data extents
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* to be initialised to zero. It will be ignored if XFS_BMAPI_METADATA is set.
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* Use in conjunction with XFS_BMAPI_CONVERT to convert unwritten extents found
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* during the allocation range to zeroed written extents.
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*/
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#define XFS_BMAPI_ZERO 0x080
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/*
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* Map the inode offset to the block given in ap->firstblock. Primarily
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* used for reflink. The range must be in a hole, and this flag cannot be
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* turned on with PREALLOC or CONVERT, and cannot be used on the attr fork.
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*
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* For bunmapi, this flag unmaps the range without adjusting quota, reducing
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* refcount, or freeing the blocks.
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*/
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#define XFS_BMAPI_REMAP 0x100
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/* Map something in the CoW fork. */
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#define XFS_BMAPI_COWFORK 0x200
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/* Only convert delalloc space, don't allocate entirely new extents */
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#define XFS_BMAPI_DELALLOC 0x400
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#define XFS_BMAPI_FLAGS \
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{ XFS_BMAPI_ENTIRE, "ENTIRE" }, \
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{ XFS_BMAPI_METADATA, "METADATA" }, \
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{ XFS_BMAPI_ATTRFORK, "ATTRFORK" }, \
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{ XFS_BMAPI_PREALLOC, "PREALLOC" }, \
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{ XFS_BMAPI_IGSTATE, "IGSTATE" }, \
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{ XFS_BMAPI_CONTIG, "CONTIG" }, \
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{ XFS_BMAPI_CONVERT, "CONVERT" }, \
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{ XFS_BMAPI_ZERO, "ZERO" }, \
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{ XFS_BMAPI_REMAP, "REMAP" }, \
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{ XFS_BMAPI_COWFORK, "COWFORK" }, \
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{ XFS_BMAPI_DELALLOC, "DELALLOC" }
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static inline int xfs_bmapi_aflag(int w)
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{
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return (w == XFS_ATTR_FORK ? XFS_BMAPI_ATTRFORK :
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(w == XFS_COW_FORK ? XFS_BMAPI_COWFORK : 0));
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}
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static inline int xfs_bmapi_whichfork(int bmapi_flags)
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{
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if (bmapi_flags & XFS_BMAPI_COWFORK)
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return XFS_COW_FORK;
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else if (bmapi_flags & XFS_BMAPI_ATTRFORK)
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return XFS_ATTR_FORK;
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return XFS_DATA_FORK;
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}
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/*
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* Special values for xfs_bmbt_irec_t br_startblock field.
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*/
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#define DELAYSTARTBLOCK ((xfs_fsblock_t)-1LL)
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#define HOLESTARTBLOCK ((xfs_fsblock_t)-2LL)
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/*
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* Flags for xfs_bmap_add_extent*.
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*/
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#define BMAP_LEFT_CONTIG (1 << 0)
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#define BMAP_RIGHT_CONTIG (1 << 1)
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#define BMAP_LEFT_FILLING (1 << 2)
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#define BMAP_RIGHT_FILLING (1 << 3)
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#define BMAP_LEFT_DELAY (1 << 4)
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#define BMAP_RIGHT_DELAY (1 << 5)
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#define BMAP_LEFT_VALID (1 << 6)
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#define BMAP_RIGHT_VALID (1 << 7)
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#define BMAP_ATTRFORK (1 << 8)
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#define BMAP_COWFORK (1 << 9)
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#define XFS_BMAP_EXT_FLAGS \
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{ BMAP_LEFT_CONTIG, "LC" }, \
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{ BMAP_RIGHT_CONTIG, "RC" }, \
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{ BMAP_LEFT_FILLING, "LF" }, \
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{ BMAP_RIGHT_FILLING, "RF" }, \
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{ BMAP_ATTRFORK, "ATTR" }, \
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{ BMAP_COWFORK, "COW" }
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/*
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* Return true if the extent is a real, allocated extent, or false if it is a
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* delayed allocation, and unwritten extent or a hole.
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*/
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static inline bool xfs_bmap_is_real_extent(struct xfs_bmbt_irec *irec)
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{
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return irec->br_state != XFS_EXT_UNWRITTEN &&
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irec->br_startblock != HOLESTARTBLOCK &&
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irec->br_startblock != DELAYSTARTBLOCK &&
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!isnullstartblock(irec->br_startblock);
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}
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/*
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* This macro is used to determine how many extents will be shifted
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* in one write transaction. We could require two splits,
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* an extent move on the first and an extent merge on the second,
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* So it is proper that one extent is shifted inside write transaction
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* at a time.
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*/
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#define XFS_BMAP_MAX_SHIFT_EXTENTS 1
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enum shift_direction {
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SHIFT_LEFT = 0,
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SHIFT_RIGHT,
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};
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#ifdef DEBUG
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void xfs_bmap_trace_exlist(struct xfs_inode *ip, xfs_extnum_t cnt,
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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_)
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#else
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#define XFS_BMAP_TRACE_EXLIST(ip,c,w)
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#endif
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void xfs_trim_extent(struct xfs_bmbt_irec *irec, xfs_fileoff_t bno,
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xfs_filblks_t len);
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void xfs_trim_extent_eof(struct xfs_bmbt_irec *, struct xfs_inode *);
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int xfs_bmap_add_attrfork(struct xfs_inode *ip, int size, int rsvd);
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void xfs_bmap_local_to_extents_empty(struct xfs_inode *ip, int whichfork);
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void xfs_bmap_add_free(struct xfs_mount *mp, struct xfs_defer_ops *dfops,
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xfs_fsblock_t bno, xfs_filblks_t len,
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struct xfs_owner_info *oinfo);
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void xfs_bmap_compute_maxlevels(struct xfs_mount *mp, int whichfork);
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int xfs_bmap_first_unused(struct xfs_trans *tp, struct xfs_inode *ip,
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xfs_extlen_t len, xfs_fileoff_t *unused, int whichfork);
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int xfs_bmap_last_before(struct xfs_trans *tp, struct xfs_inode *ip,
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xfs_fileoff_t *last_block, int whichfork);
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int xfs_bmap_last_offset(struct xfs_inode *ip, xfs_fileoff_t *unused,
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int whichfork);
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int xfs_bmap_one_block(struct xfs_inode *ip, int whichfork);
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int xfs_bmap_read_extents(struct xfs_trans *tp, struct xfs_inode *ip,
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int whichfork);
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int xfs_bmapi_read(struct xfs_inode *ip, xfs_fileoff_t bno,
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xfs_filblks_t len, struct xfs_bmbt_irec *mval,
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int *nmap, int flags);
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int xfs_bmapi_write(struct xfs_trans *tp, struct xfs_inode *ip,
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xfs_fileoff_t bno, xfs_filblks_t len, int flags,
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xfs_fsblock_t *firstblock, xfs_extlen_t total,
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struct xfs_bmbt_irec *mval, int *nmap,
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struct xfs_defer_ops *dfops);
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int __xfs_bunmapi(struct xfs_trans *tp, struct xfs_inode *ip,
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xfs_fileoff_t bno, xfs_filblks_t *rlen, int flags,
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xfs_extnum_t nexts, xfs_fsblock_t *firstblock,
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struct xfs_defer_ops *dfops);
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int xfs_bunmapi(struct xfs_trans *tp, struct xfs_inode *ip,
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xfs_fileoff_t bno, xfs_filblks_t len, int flags,
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xfs_extnum_t nexts, xfs_fsblock_t *firstblock,
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struct xfs_defer_ops *dfops, int *done);
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int xfs_bmap_del_extent_delay(struct xfs_inode *ip, int whichfork,
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xfs_extnum_t *idx, struct xfs_bmbt_irec *got,
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struct xfs_bmbt_irec *del);
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void xfs_bmap_del_extent_cow(struct xfs_inode *ip, xfs_extnum_t *idx,
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struct xfs_bmbt_irec *got, struct xfs_bmbt_irec *del);
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uint xfs_default_attroffset(struct xfs_inode *ip);
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int xfs_bmap_shift_extents(struct xfs_trans *tp, struct xfs_inode *ip,
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xfs_fileoff_t *next_fsb, xfs_fileoff_t offset_shift_fsb,
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int *done, xfs_fileoff_t stop_fsb, xfs_fsblock_t *firstblock,
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struct xfs_defer_ops *dfops, enum shift_direction direction,
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int num_exts);
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int xfs_bmap_split_extent(struct xfs_inode *ip, xfs_fileoff_t split_offset);
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int xfs_bmapi_reserve_delalloc(struct xfs_inode *ip, int whichfork,
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xfs_fileoff_t off, xfs_filblks_t len, xfs_filblks_t prealloc,
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struct xfs_bmbt_irec *got, xfs_extnum_t *lastx, int eof);
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enum xfs_bmap_intent_type {
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XFS_BMAP_MAP = 1,
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XFS_BMAP_UNMAP,
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};
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struct xfs_bmap_intent {
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struct list_head bi_list;
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enum xfs_bmap_intent_type bi_type;
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struct xfs_inode *bi_owner;
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int bi_whichfork;
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struct xfs_bmbt_irec bi_bmap;
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};
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int xfs_bmap_finish_one(struct xfs_trans *tp, struct xfs_defer_ops *dfops,
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struct xfs_inode *ip, enum xfs_bmap_intent_type type,
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int whichfork, xfs_fileoff_t startoff, xfs_fsblock_t startblock,
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xfs_filblks_t *blockcount, xfs_exntst_t state);
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int xfs_bmap_map_extent(struct xfs_mount *mp, struct xfs_defer_ops *dfops,
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struct xfs_inode *ip, struct xfs_bmbt_irec *imap);
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int xfs_bmap_unmap_extent(struct xfs_mount *mp, struct xfs_defer_ops *dfops,
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struct xfs_inode *ip, struct xfs_bmbt_irec *imap);
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#endif /* __XFS_BMAP_H__ */
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