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Diffstat (limited to 'fs/xfs/libxfs/xfs_alloc.h')
| -rw-r--r-- | fs/xfs/libxfs/xfs_alloc.h | 253 |
1 files changed, 253 insertions, 0 deletions
diff --git a/fs/xfs/libxfs/xfs_alloc.h b/fs/xfs/libxfs/xfs_alloc.h new file mode 100644 index 000000000..00cd5ec4c --- /dev/null +++ b/fs/xfs/libxfs/xfs_alloc.h @@ -0,0 +1,253 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2000-2002,2005 Silicon Graphics, Inc. + * All Rights Reserved. + */ +#ifndef __XFS_ALLOC_H__ +#define __XFS_ALLOC_H__ + +struct xfs_buf; +struct xfs_btree_cur; +struct xfs_mount; +struct xfs_perag; +struct xfs_trans; + +extern struct workqueue_struct *xfs_alloc_wq; + +unsigned int xfs_agfl_size(struct xfs_mount *mp); + +/* + * Freespace allocation types. Argument to xfs_alloc_[v]extent. + */ +#define XFS_ALLOCTYPE_FIRST_AG 0x02 /* ... start at ag 0 */ +#define XFS_ALLOCTYPE_THIS_AG 0x08 /* anywhere in this a.g. */ +#define XFS_ALLOCTYPE_START_BNO 0x10 /* near this block else anywhere */ +#define XFS_ALLOCTYPE_NEAR_BNO 0x20 /* in this a.g. and near this block */ +#define XFS_ALLOCTYPE_THIS_BNO 0x40 /* at exactly this block */ + +/* this should become an enum again when the tracing code is fixed */ +typedef unsigned int xfs_alloctype_t; + +#define XFS_ALLOC_TYPES \ + { XFS_ALLOCTYPE_FIRST_AG, "FIRST_AG" }, \ + { XFS_ALLOCTYPE_THIS_AG, "THIS_AG" }, \ + { XFS_ALLOCTYPE_START_BNO, "START_BNO" }, \ + { XFS_ALLOCTYPE_NEAR_BNO, "NEAR_BNO" }, \ + { XFS_ALLOCTYPE_THIS_BNO, "THIS_BNO" } + +/* + * Flags for xfs_alloc_fix_freelist. + */ +#define XFS_ALLOC_FLAG_TRYLOCK 0x00000001 /* use trylock for buffer locking */ +#define XFS_ALLOC_FLAG_FREEING 0x00000002 /* indicate caller is freeing extents*/ +#define XFS_ALLOC_FLAG_NORMAP 0x00000004 /* don't modify the rmapbt */ +#define XFS_ALLOC_FLAG_NOSHRINK 0x00000008 /* don't shrink the freelist */ +#define XFS_ALLOC_FLAG_CHECK 0x00000010 /* test only, don't modify args */ + +/* + * Argument structure for xfs_alloc routines. + * This is turned into a structure to avoid having 20 arguments passed + * down several levels of the stack. + */ +typedef struct xfs_alloc_arg { + struct xfs_trans *tp; /* transaction pointer */ + struct xfs_mount *mp; /* file system mount point */ + struct xfs_buf *agbp; /* buffer for a.g. freelist header */ + struct xfs_perag *pag; /* per-ag struct for this agno */ + struct xfs_inode *ip; /* for userdata zeroing method */ + xfs_fsblock_t fsbno; /* file system block number */ + xfs_agnumber_t agno; /* allocation group number */ + xfs_agblock_t agbno; /* allocation group-relative block # */ + xfs_extlen_t minlen; /* minimum size of extent */ + xfs_extlen_t maxlen; /* maximum size of extent */ + xfs_extlen_t mod; /* mod value for extent size */ + xfs_extlen_t prod; /* prod value for extent size */ + xfs_extlen_t minleft; /* min blocks must be left after us */ + xfs_extlen_t total; /* total blocks needed in xaction */ + xfs_extlen_t alignment; /* align answer to multiple of this */ + xfs_extlen_t minalignslop; /* slop for minlen+alignment calcs */ + xfs_agblock_t min_agbno; /* set an agbno range for NEAR allocs */ + xfs_agblock_t max_agbno; /* ... */ + xfs_extlen_t len; /* output: actual size of extent */ + xfs_alloctype_t type; /* allocation type XFS_ALLOCTYPE_... */ + xfs_alloctype_t otype; /* original allocation type */ + int datatype; /* mask defining data type treatment */ + char wasdel; /* set if allocation was prev delayed */ + char wasfromfl; /* set if allocation is from freelist */ + struct xfs_owner_info oinfo; /* owner of blocks being allocated */ + enum xfs_ag_resv_type resv; /* block reservation to use */ +} xfs_alloc_arg_t; + +/* + * Defines for datatype + */ +#define XFS_ALLOC_USERDATA (1 << 0)/* allocation is for user data*/ +#define XFS_ALLOC_INITIAL_USER_DATA (1 << 1)/* special case start of file */ +#define XFS_ALLOC_USERDATA_ZERO (1 << 2)/* zero extent on allocation */ +#define XFS_ALLOC_NOBUSY (1 << 3)/* Busy extents not allowed */ + +static inline bool +xfs_alloc_is_userdata(int datatype) +{ + return (datatype & ~XFS_ALLOC_NOBUSY) != 0; +} + +static inline bool +xfs_alloc_allow_busy_reuse(int datatype) +{ + return (datatype & XFS_ALLOC_NOBUSY) == 0; +} + +/* freespace limit calculations */ +#define XFS_ALLOC_AGFL_RESERVE 4 +unsigned int xfs_alloc_set_aside(struct xfs_mount *mp); +unsigned int xfs_alloc_ag_max_usable(struct xfs_mount *mp); + +xfs_extlen_t xfs_alloc_longest_free_extent(struct xfs_perag *pag, + xfs_extlen_t need, xfs_extlen_t reserved); +unsigned int xfs_alloc_min_freelist(struct xfs_mount *mp, + struct xfs_perag *pag); + +/* + * Compute and fill in value of m_ag_maxlevels. + */ +void +xfs_alloc_compute_maxlevels( + struct xfs_mount *mp); /* file system mount structure */ + +/* + * Get a block from the freelist. + * Returns with the buffer for the block gotten. + */ +int /* error */ +xfs_alloc_get_freelist( + struct xfs_trans *tp, /* transaction pointer */ + struct xfs_buf *agbp, /* buffer containing the agf structure */ + xfs_agblock_t *bnop, /* block address retrieved from freelist */ + int btreeblk); /* destination is a AGF btree */ + +/* + * Log the given fields from the agf structure. + */ +void +xfs_alloc_log_agf( + struct xfs_trans *tp, /* transaction pointer */ + struct xfs_buf *bp, /* buffer for a.g. freelist header */ + int fields);/* mask of fields to be logged (XFS_AGF_...) */ + +/* + * Interface for inode allocation to force the pag data to be initialized. + */ +int /* error */ +xfs_alloc_pagf_init( + struct xfs_mount *mp, /* file system mount structure */ + struct xfs_trans *tp, /* transaction pointer */ + xfs_agnumber_t agno, /* allocation group number */ + int flags); /* XFS_ALLOC_FLAGS_... */ + +/* + * Put the block on the freelist for the allocation group. + */ +int /* error */ +xfs_alloc_put_freelist( + struct xfs_trans *tp, /* transaction pointer */ + struct xfs_buf *agbp, /* buffer for a.g. freelist header */ + struct xfs_buf *agflbp,/* buffer for a.g. free block array */ + xfs_agblock_t bno, /* block being freed */ + int btreeblk); /* owner was a AGF btree */ + +/* + * Read in the allocation group header (free/alloc section). + */ +int /* error */ +xfs_alloc_read_agf( + struct xfs_mount *mp, /* mount point structure */ + struct xfs_trans *tp, /* transaction pointer */ + xfs_agnumber_t agno, /* allocation group number */ + int flags, /* XFS_ALLOC_FLAG_... */ + struct xfs_buf **bpp); /* buffer for the ag freelist header */ + +/* + * Allocate an extent (variable-size). + */ +int /* error */ +xfs_alloc_vextent( + xfs_alloc_arg_t *args); /* allocation argument structure */ + +/* + * Free an extent. + */ +int /* error */ +__xfs_free_extent( + struct xfs_trans *tp, /* transaction pointer */ + xfs_fsblock_t bno, /* starting block number of extent */ + xfs_extlen_t len, /* length of extent */ + struct xfs_owner_info *oinfo, /* extent owner */ + enum xfs_ag_resv_type type, /* block reservation type */ + bool skip_discard); + +static inline int +xfs_free_extent( + struct xfs_trans *tp, + xfs_fsblock_t bno, + xfs_extlen_t len, + struct xfs_owner_info *oinfo, + enum xfs_ag_resv_type type) +{ + return __xfs_free_extent(tp, bno, len, oinfo, type, false); +} + +int /* error */ +xfs_alloc_lookup_le( + struct xfs_btree_cur *cur, /* btree cursor */ + xfs_agblock_t bno, /* starting block of extent */ + xfs_extlen_t len, /* length of extent */ + int *stat); /* success/failure */ + +int /* error */ +xfs_alloc_lookup_ge( + struct xfs_btree_cur *cur, /* btree cursor */ + xfs_agblock_t bno, /* starting block of extent */ + xfs_extlen_t len, /* length of extent */ + int *stat); /* success/failure */ + +int /* error */ +xfs_alloc_get_rec( + struct xfs_btree_cur *cur, /* btree cursor */ + xfs_agblock_t *bno, /* output: starting block of extent */ + xfs_extlen_t *len, /* output: length of extent */ + int *stat); /* output: success/failure */ + +int xfs_read_agf(struct xfs_mount *mp, struct xfs_trans *tp, + xfs_agnumber_t agno, int flags, struct xfs_buf **bpp); +int xfs_alloc_read_agfl(struct xfs_mount *mp, struct xfs_trans *tp, + xfs_agnumber_t agno, struct xfs_buf **bpp); +int xfs_free_agfl_block(struct xfs_trans *, xfs_agnumber_t, xfs_agblock_t, + struct xfs_buf *, struct xfs_owner_info *); +int xfs_alloc_fix_freelist(struct xfs_alloc_arg *args, int flags); +int xfs_free_extent_fix_freelist(struct xfs_trans *tp, xfs_agnumber_t agno, + struct xfs_buf **agbp); + +xfs_extlen_t xfs_prealloc_blocks(struct xfs_mount *mp); + +typedef int (*xfs_alloc_query_range_fn)( + struct xfs_btree_cur *cur, + struct xfs_alloc_rec_incore *rec, + void *priv); + +int xfs_alloc_query_range(struct xfs_btree_cur *cur, + struct xfs_alloc_rec_incore *low_rec, + struct xfs_alloc_rec_incore *high_rec, + xfs_alloc_query_range_fn fn, void *priv); +int xfs_alloc_query_all(struct xfs_btree_cur *cur, xfs_alloc_query_range_fn fn, + void *priv); + +int xfs_alloc_has_record(struct xfs_btree_cur *cur, xfs_agblock_t bno, + xfs_extlen_t len, bool *exist); + +typedef int (*xfs_agfl_walk_fn)(struct xfs_mount *mp, xfs_agblock_t bno, + void *priv); +int xfs_agfl_walk(struct xfs_mount *mp, struct xfs_agf *agf, + struct xfs_buf *agflbp, xfs_agfl_walk_fn walk_fn, void *priv); + +#endif /* __XFS_ALLOC_H__ */ |