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We must decide in xfs_alloc_fix_freelist if we can perform an allocation from a given AG is possible or not based on the available space, and should not fail the allocation past that point on a healthy file system. But currently we have two additional places that second-guess xfs_alloc_fix_freelist: xfs_alloc_ag_vextent tries to adjust the maxlen parameter to remove the reservation before doing the allocation (but ignores the various minium freespace requirements), and xfs_alloc_fix_minleft tries to fix up the allocated length after we've found an extent, but ignores the reservations and also doesn't take the AGFL into account (and thus fails allocations for not matching minlen in some cases). Remove all these later fixups and just correct the maxlen argument inside xfs_alloc_fix_freelist once we have the AGF buffer locked. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Brian Foster <bfoster@redhat.com> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
227 lines
8.0 KiB
C
227 lines
8.0 KiB
C
/*
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* Copyright (c) 2000-2002,2005 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_ALLOC_H__
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#define __XFS_ALLOC_H__
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struct xfs_buf;
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struct xfs_btree_cur;
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struct xfs_mount;
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struct xfs_perag;
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struct xfs_trans;
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extern struct workqueue_struct *xfs_alloc_wq;
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/*
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* Freespace allocation types. Argument to xfs_alloc_[v]extent.
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*/
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#define XFS_ALLOCTYPE_ANY_AG 0x01 /* allocate anywhere, use rotor */
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#define XFS_ALLOCTYPE_FIRST_AG 0x02 /* ... start at ag 0 */
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#define XFS_ALLOCTYPE_START_AG 0x04 /* anywhere, start in this a.g. */
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#define XFS_ALLOCTYPE_THIS_AG 0x08 /* anywhere in this a.g. */
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#define XFS_ALLOCTYPE_START_BNO 0x10 /* near this block else anywhere */
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#define XFS_ALLOCTYPE_NEAR_BNO 0x20 /* in this a.g. and near this block */
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#define XFS_ALLOCTYPE_THIS_BNO 0x40 /* at exactly this block */
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/* this should become an enum again when the tracing code is fixed */
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typedef unsigned int xfs_alloctype_t;
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#define XFS_ALLOC_TYPES \
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{ XFS_ALLOCTYPE_ANY_AG, "ANY_AG" }, \
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{ XFS_ALLOCTYPE_FIRST_AG, "FIRST_AG" }, \
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{ XFS_ALLOCTYPE_START_AG, "START_AG" }, \
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{ XFS_ALLOCTYPE_THIS_AG, "THIS_AG" }, \
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{ XFS_ALLOCTYPE_START_BNO, "START_BNO" }, \
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{ XFS_ALLOCTYPE_NEAR_BNO, "NEAR_BNO" }, \
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{ XFS_ALLOCTYPE_THIS_BNO, "THIS_BNO" }
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/*
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* Flags for xfs_alloc_fix_freelist.
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*/
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#define XFS_ALLOC_FLAG_TRYLOCK 0x00000001 /* use trylock for buffer locking */
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#define XFS_ALLOC_FLAG_FREEING 0x00000002 /* indicate caller is freeing extents*/
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#define XFS_ALLOC_FLAG_NORMAP 0x00000004 /* don't modify the rmapbt */
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#define XFS_ALLOC_FLAG_NOSHRINK 0x00000008 /* don't shrink the freelist */
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#define XFS_ALLOC_FLAG_CHECK 0x00000010 /* test only, don't modify args */
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/*
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* Argument structure for xfs_alloc routines.
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* This is turned into a structure to avoid having 20 arguments passed
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* down several levels of the stack.
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*/
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typedef struct xfs_alloc_arg {
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struct xfs_trans *tp; /* transaction pointer */
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struct xfs_mount *mp; /* file system mount point */
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struct xfs_buf *agbp; /* buffer for a.g. freelist header */
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struct xfs_perag *pag; /* per-ag struct for this agno */
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struct xfs_inode *ip; /* for userdata zeroing method */
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xfs_fsblock_t fsbno; /* file system block number */
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xfs_agnumber_t agno; /* allocation group number */
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xfs_agblock_t agbno; /* allocation group-relative block # */
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xfs_extlen_t minlen; /* minimum size of extent */
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xfs_extlen_t maxlen; /* maximum size of extent */
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xfs_extlen_t mod; /* mod value for extent size */
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xfs_extlen_t prod; /* prod value for extent size */
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xfs_extlen_t minleft; /* min blocks must be left after us */
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xfs_extlen_t total; /* total blocks needed in xaction */
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xfs_extlen_t alignment; /* align answer to multiple of this */
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xfs_extlen_t minalignslop; /* slop for minlen+alignment calcs */
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xfs_agblock_t min_agbno; /* set an agbno range for NEAR allocs */
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xfs_agblock_t max_agbno; /* ... */
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xfs_extlen_t len; /* output: actual size of extent */
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xfs_alloctype_t type; /* allocation type XFS_ALLOCTYPE_... */
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xfs_alloctype_t otype; /* original allocation type */
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int datatype; /* mask defining data type treatment */
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char wasdel; /* set if allocation was prev delayed */
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char wasfromfl; /* set if allocation is from freelist */
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xfs_fsblock_t firstblock; /* io first block allocated */
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struct xfs_owner_info oinfo; /* owner of blocks being allocated */
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enum xfs_ag_resv_type resv; /* block reservation to use */
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} xfs_alloc_arg_t;
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/*
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* Defines for datatype
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*/
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#define XFS_ALLOC_USERDATA (1 << 0)/* allocation is for user data*/
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#define XFS_ALLOC_INITIAL_USER_DATA (1 << 1)/* special case start of file */
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#define XFS_ALLOC_USERDATA_ZERO (1 << 2)/* zero extent on allocation */
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#define XFS_ALLOC_NOBUSY (1 << 3)/* Busy extents not allowed */
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static inline bool
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xfs_alloc_is_userdata(int datatype)
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{
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return (datatype & ~XFS_ALLOC_NOBUSY) != 0;
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}
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static inline bool
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xfs_alloc_allow_busy_reuse(int datatype)
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{
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return (datatype & XFS_ALLOC_NOBUSY) == 0;
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}
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/* freespace limit calculations */
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#define XFS_ALLOC_AGFL_RESERVE 4
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unsigned int xfs_alloc_set_aside(struct xfs_mount *mp);
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unsigned int xfs_alloc_ag_max_usable(struct xfs_mount *mp);
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xfs_extlen_t xfs_alloc_longest_free_extent(struct xfs_mount *mp,
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struct xfs_perag *pag, xfs_extlen_t need,
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xfs_extlen_t reserved);
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unsigned int xfs_alloc_min_freelist(struct xfs_mount *mp,
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struct xfs_perag *pag);
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/*
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* Compute and fill in value of m_ag_maxlevels.
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*/
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void
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xfs_alloc_compute_maxlevels(
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struct xfs_mount *mp); /* file system mount structure */
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/*
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* Get a block from the freelist.
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* Returns with the buffer for the block gotten.
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*/
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int /* error */
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xfs_alloc_get_freelist(
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struct xfs_trans *tp, /* transaction pointer */
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struct xfs_buf *agbp, /* buffer containing the agf structure */
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xfs_agblock_t *bnop, /* block address retrieved from freelist */
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int btreeblk); /* destination is a AGF btree */
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/*
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* Log the given fields from the agf structure.
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*/
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void
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xfs_alloc_log_agf(
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struct xfs_trans *tp, /* transaction pointer */
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struct xfs_buf *bp, /* buffer for a.g. freelist header */
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int fields);/* mask of fields to be logged (XFS_AGF_...) */
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/*
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* Interface for inode allocation to force the pag data to be initialized.
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*/
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int /* error */
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xfs_alloc_pagf_init(
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struct xfs_mount *mp, /* file system mount structure */
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struct xfs_trans *tp, /* transaction pointer */
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xfs_agnumber_t agno, /* allocation group number */
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int flags); /* XFS_ALLOC_FLAGS_... */
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/*
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* Put the block on the freelist for the allocation group.
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*/
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int /* error */
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xfs_alloc_put_freelist(
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struct xfs_trans *tp, /* transaction pointer */
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struct xfs_buf *agbp, /* buffer for a.g. freelist header */
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struct xfs_buf *agflbp,/* buffer for a.g. free block array */
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xfs_agblock_t bno, /* block being freed */
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int btreeblk); /* owner was a AGF btree */
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/*
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* Read in the allocation group header (free/alloc section).
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*/
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int /* error */
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xfs_alloc_read_agf(
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struct xfs_mount *mp, /* mount point structure */
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struct xfs_trans *tp, /* transaction pointer */
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xfs_agnumber_t agno, /* allocation group number */
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int flags, /* XFS_ALLOC_FLAG_... */
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struct xfs_buf **bpp); /* buffer for the ag freelist header */
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/*
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* Allocate an extent (variable-size).
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*/
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int /* error */
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xfs_alloc_vextent(
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xfs_alloc_arg_t *args); /* allocation argument structure */
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/*
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* Free an extent.
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*/
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int /* error */
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xfs_free_extent(
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struct xfs_trans *tp, /* transaction pointer */
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xfs_fsblock_t bno, /* starting block number of extent */
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xfs_extlen_t len, /* length of extent */
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struct xfs_owner_info *oinfo, /* extent owner */
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enum xfs_ag_resv_type type); /* block reservation type */
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int /* error */
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xfs_alloc_lookup_ge(
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struct xfs_btree_cur *cur, /* btree cursor */
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xfs_agblock_t bno, /* starting block of extent */
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xfs_extlen_t len, /* length of extent */
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int *stat); /* success/failure */
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int /* error */
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xfs_alloc_get_rec(
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struct xfs_btree_cur *cur, /* btree cursor */
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xfs_agblock_t *bno, /* output: starting block of extent */
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xfs_extlen_t *len, /* output: length of extent */
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int *stat); /* output: success/failure */
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int xfs_read_agf(struct xfs_mount *mp, struct xfs_trans *tp,
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xfs_agnumber_t agno, int flags, struct xfs_buf **bpp);
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int xfs_alloc_fix_freelist(struct xfs_alloc_arg *args, int flags);
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int xfs_free_extent_fix_freelist(struct xfs_trans *tp, xfs_agnumber_t agno,
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struct xfs_buf **agbp);
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xfs_extlen_t xfs_prealloc_blocks(struct xfs_mount *mp);
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#endif /* __XFS_ALLOC_H__ */
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