xfs/libxfs/xfs_ialloc.h

0001 // SPDX-License-Identifier: GPL-2.0
0002 /*
0003  * Copyright (c) 2000,2005 Silicon Graphics, Inc.
0004  * All Rights Reserved.
0005  */
0006 #ifndef __XFS_IALLOC_H__
0007 #define __XFS_IALLOC_H__
0008
0009 struct xfs_buf;
0010 struct xfs_dinode;
0011 struct xfs_imap;
0012 struct xfs_mount;
0013 struct xfs_trans;
0014 struct xfs_btree_cur;
0015
0016 /* Move inodes in clusters of this size */
0017 #define XFS_INODE_BIG_CLUSTER_SIZE  8192
0018
0019 struct xfs_icluster {
0020     bool        deleted;    /* record is deleted */
0021     xfs_ino_t   first_ino;  /* first inode number */
0022     uint64_t    alloc;      /* inode phys. allocation bitmap for
0023                      * sparse chunks */
0024 };
0025
0026 /*
0027  * Make an inode pointer out of the buffer/offset.
0028  */
0029 static inline struct xfs_dinode *
0030 xfs_make_iptr(struct xfs_mount *mp, struct xfs_buf *b, int o)
0031 {
0032     return xfs_buf_offset(b, o << (mp)->m_sb.sb_inodelog);
0033 }
0034
0035 /*
0036  * Allocate an inode on disk.  Mode is used to tell whether the new inode will
0037  * need space, and whether it is a directory.
0038  */
0039 int xfs_dialloc(struct xfs_trans **tpp, xfs_ino_t parent, umode_t mode,
0040         xfs_ino_t *new_ino);
0041
0042 int xfs_difree(struct xfs_trans *tp, struct xfs_perag *pag,
0043         xfs_ino_t ino, struct xfs_icluster *ifree);
0044
0045 /*
0046  * Return the location of the inode in imap, for mapping it into a buffer.
0047  */
0048 int
0049 xfs_imap(
0050     struct xfs_mount *mp,       /* file system mount structure */
0051     struct xfs_trans *tp,       /* transaction pointer */
0052     xfs_ino_t   ino,        /* inode to locate */
0053     struct xfs_imap *imap,      /* location map structure */
0054     uint        flags);     /* flags for inode btree lookup */
0055
0056 /*
0057  * Log specified fields for the ag hdr (inode section)
0058  */
0059 void
0060 xfs_ialloc_log_agi(
0061     struct xfs_trans *tp,       /* transaction pointer */
0062     struct xfs_buf  *bp,        /* allocation group header buffer */
0063     uint32_t    fields);    /* bitmask of fields to log */
0064
0065 int xfs_read_agi(struct xfs_perag *pag, struct xfs_trans *tp,
0066         struct xfs_buf **agibpp);
0067 int xfs_ialloc_read_agi(struct xfs_perag *pag, struct xfs_trans *tp,
0068         struct xfs_buf **agibpp);
0069
0070 /*
0071  * Lookup a record by ino in the btree given by cur.
0072  */
0073 int xfs_inobt_lookup(struct xfs_btree_cur *cur, xfs_agino_t ino,
0074         xfs_lookup_t dir, int *stat);
0075
0076 /*
0077  * Get the data from the pointed-to record.
0078  */
0079 int xfs_inobt_get_rec(struct xfs_btree_cur *cur,
0080         xfs_inobt_rec_incore_t *rec, int *stat);
0081
0082 /*
0083  * Inode chunk initialisation routine
0084  */
0085 int xfs_ialloc_inode_init(struct xfs_mount *mp, struct xfs_trans *tp,
0086               struct list_head *buffer_list, int icount,
0087               xfs_agnumber_t agno, xfs_agblock_t agbno,
0088               xfs_agblock_t length, unsigned int gen);
0089
0090
0091 union xfs_btree_rec;
0092 void xfs_inobt_btrec_to_irec(struct xfs_mount *mp,
0093         const union xfs_btree_rec *rec,
0094         struct xfs_inobt_rec_incore *irec);
0095 int xfs_ialloc_has_inodes_at_extent(struct xfs_btree_cur *cur,
0096         xfs_agblock_t bno, xfs_extlen_t len, bool *exists);
0097 int xfs_ialloc_has_inode_record(struct xfs_btree_cur *cur, xfs_agino_t low,
0098         xfs_agino_t high, bool *exists);
0099 int xfs_ialloc_count_inodes(struct xfs_btree_cur *cur, xfs_agino_t *count,
0100         xfs_agino_t *freecount);
0101 int xfs_inobt_insert_rec(struct xfs_btree_cur *cur, uint16_t holemask,
0102         uint8_t count, int32_t freecount, xfs_inofree_t free,
0103         int *stat);
0104
0105 int xfs_ialloc_cluster_alignment(struct xfs_mount *mp);
0106 void xfs_ialloc_setup_geometry(struct xfs_mount *mp);
0107 xfs_ino_t xfs_ialloc_calc_rootino(struct xfs_mount *mp, int sunit);
0108
0109 int xfs_ialloc_check_shrink(struct xfs_trans *tp, xfs_agnumber_t agno,
0110         struct xfs_buf *agibp, xfs_agblock_t new_length);
0111
0112 #endif  /* __XFS_IALLOC_H__ */