diff options
Diffstat (limited to 'fs/xfs/xfs_bmap.h')
| -rw-r--r-- | fs/xfs/xfs_bmap.h | 357 |
1 files changed, 62 insertions, 295 deletions
diff --git a/fs/xfs/xfs_bmap.h b/fs/xfs/xfs_bmap.h index 419dafb9d87..b879ca56a64 100644 --- a/fs/xfs/xfs_bmap.h +++ b/fs/xfs/xfs_bmap.h @@ -28,20 +28,6 @@ struct xfs_trans; extern kmem_zone_t *xfs_bmap_free_item_zone; /* - * DELTA: describe a change to the in-core extent list. - * - * Internally the use of xed_blockount is somewhat funky. - * xed_blockcount contains an offset much of the time because this - * makes merging changes easier. (xfs_fileoff_t and xfs_filblks_t are - * the same underlying type). - */ -typedef struct xfs_extdelta -{ - xfs_fileoff_t xed_startoff; /* offset of range */ - xfs_filblks_t xed_blockcount; /* blocks in range */ -} xfs_extdelta_t; - -/* * List of extents to be free "later". * The list is kept sorted on xbf_startblock. */ @@ -76,34 +62,26 @@ typedef struct xfs_bmap_free #define XFS_BMAP_MAX_NMAP 4 /* - * Flags for xfs_bmapi + * 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 - */ +#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 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_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_FLAGS \ - { XFS_BMAPI_WRITE, "WRITE" }, \ - { XFS_BMAPI_DELAY, "DELAY" }, \ { XFS_BMAPI_ENTIRE, "ENTIRE" }, \ { XFS_BMAPI_METADATA, "METADATA" }, \ - { XFS_BMAPI_EXACT, "EXACT" }, \ { XFS_BMAPI_ATTRFORK, "ATTRFORK" }, \ - { XFS_BMAPI_ASYNC, "ASYNC" }, \ - { XFS_BMAPI_RSVBLOCKS, "RSVBLOCKS" }, \ { XFS_BMAPI_PREALLOC, "PREALLOC" }, \ { XFS_BMAPI_IGSTATE, "IGSTATE" }, \ { XFS_BMAPI_CONTIG, "CONTIG" }, \ @@ -128,29 +106,6 @@ static inline void xfs_bmap_init(xfs_bmap_free_t *flp, xfs_fsblock_t *fbp) } /* - * 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; /* minimum 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; - -/* * Flags for xfs_bmap_add_extent*. */ #define BMAP_LEFT_CONTIG (1 << 0) @@ -170,250 +125,62 @@ typedef struct xfs_bmalloca { { BMAP_RIGHT_FILLING, "RF" }, \ { BMAP_ATTRFORK, "ATTR" } + /* - * Add bmap trace insert entries for all the contents of the extent list. - * - * Quite excessive tracing. Only do this for debug builds. + * 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. */ -#if defined(__KERNEL) && defined(DEBUG) -void -xfs_bmap_trace_exlist( - struct xfs_inode *ip, /* incore inode pointer */ - xfs_extnum_t cnt, /* count of entries in list */ - int whichfork, - unsigned long caller_ip); /* data or attr fork */ +#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 -/* - * 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 */ - -/* - * 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 */ - xfs_extdelta_t *delta); /* o: change made to incore - extents */ - -/* - * 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 */ - xfs_extdelta_t *delta, /* o: change made to incore - extents */ - int *done); /* set if not done yet */ - -/* - * Check an extent list, which has just been read, for - * any bit in the extent flag field. - */ -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); - -#ifdef __KERNEL__ - -/* - * 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 */ - int *committed); /* xact committed or not */ - -/* bmap to userspace formatter - copy to user & advance pointer */ -typedef int (*xfs_bmap_format_t)(void **, struct getbmapx *, int *); - -/* - * Get inode's extents as described in bmv, and format for output. - */ -int /* error code */ -xfs_getbmap( - xfs_inode_t *ip, - struct getbmapx *bmv, /* user bmap structure */ - xfs_bmap_format_t formatter, /* format to user */ - void *arg); /* formatter arg */ - -/* - * 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); - -#endif /* __KERNEL__ */ +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__ */ |