173 строки
5.4 KiB
C
173 строки
5.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Copyright (c) 2000,2005 Silicon Graphics, Inc.
|
|
* All Rights Reserved.
|
|
*/
|
|
#ifndef __XFS_IALLOC_H__
|
|
#define __XFS_IALLOC_H__
|
|
|
|
struct xfs_buf;
|
|
struct xfs_dinode;
|
|
struct xfs_imap;
|
|
struct xfs_mount;
|
|
struct xfs_trans;
|
|
struct xfs_btree_cur;
|
|
|
|
/* Move inodes in clusters of this size */
|
|
#define XFS_INODE_BIG_CLUSTER_SIZE 8192
|
|
|
|
struct xfs_icluster {
|
|
bool deleted; /* record is deleted */
|
|
xfs_ino_t first_ino; /* first inode number */
|
|
uint64_t alloc; /* inode phys. allocation bitmap for
|
|
* sparse chunks */
|
|
};
|
|
|
|
/* Calculate and return the number of filesystem blocks per inode cluster */
|
|
static inline int
|
|
xfs_icluster_size_fsb(
|
|
struct xfs_mount *mp)
|
|
{
|
|
if (mp->m_sb.sb_blocksize >= mp->m_inode_cluster_size)
|
|
return 1;
|
|
return mp->m_inode_cluster_size >> mp->m_sb.sb_blocklog;
|
|
}
|
|
|
|
/*
|
|
* Make an inode pointer out of the buffer/offset.
|
|
*/
|
|
static inline struct xfs_dinode *
|
|
xfs_make_iptr(struct xfs_mount *mp, struct xfs_buf *b, int o)
|
|
{
|
|
return xfs_buf_offset(b, o << (mp)->m_sb.sb_inodelog);
|
|
}
|
|
|
|
/*
|
|
* Allocate an inode on disk.
|
|
* Mode is used to tell whether the new inode will need space, and whether
|
|
* it is a directory.
|
|
*
|
|
* To work within the constraint of one allocation per transaction,
|
|
* xfs_dialloc() is designed to be called twice if it has to do an
|
|
* allocation to make more free inodes. If an inode is
|
|
* available without an allocation, agbp would be set to the current
|
|
* agbp and alloc_done set to false.
|
|
* If an allocation needed to be done, agbp would be set to the
|
|
* inode header of the allocation group and alloc_done set to true.
|
|
* The caller should then commit the current transaction and allocate a new
|
|
* transaction. xfs_dialloc() should then be called again with
|
|
* the agbp value returned from the previous call.
|
|
*
|
|
* Once we successfully pick an inode its number is returned and the
|
|
* on-disk data structures are updated. The inode itself is not read
|
|
* in, since doing so would break ordering constraints with xfs_reclaim.
|
|
*
|
|
* *agbp should be set to NULL on the first call, *alloc_done set to FALSE.
|
|
*/
|
|
int /* error */
|
|
xfs_dialloc(
|
|
struct xfs_trans *tp, /* transaction pointer */
|
|
xfs_ino_t parent, /* parent inode (directory) */
|
|
umode_t mode, /* mode bits for new inode */
|
|
struct xfs_buf **agbp, /* buf for a.g. inode header */
|
|
xfs_ino_t *inop); /* inode number allocated */
|
|
|
|
/*
|
|
* Free disk inode. Carefully avoids touching the incore inode, all
|
|
* manipulations incore are the caller's responsibility.
|
|
* The on-disk inode is not changed by this operation, only the
|
|
* btree (free inode mask) is changed.
|
|
*/
|
|
int /* error */
|
|
xfs_difree(
|
|
struct xfs_trans *tp, /* transaction pointer */
|
|
xfs_ino_t inode, /* inode to be freed */
|
|
struct xfs_icluster *ifree); /* cluster info if deleted */
|
|
|
|
/*
|
|
* Return the location of the inode in imap, for mapping it into a buffer.
|
|
*/
|
|
int
|
|
xfs_imap(
|
|
struct xfs_mount *mp, /* file system mount structure */
|
|
struct xfs_trans *tp, /* transaction pointer */
|
|
xfs_ino_t ino, /* inode to locate */
|
|
struct xfs_imap *imap, /* location map structure */
|
|
uint flags); /* flags for inode btree lookup */
|
|
|
|
/*
|
|
* Compute and fill in value of m_in_maxlevels.
|
|
*/
|
|
void
|
|
xfs_ialloc_compute_maxlevels(
|
|
struct xfs_mount *mp); /* file system mount structure */
|
|
|
|
/*
|
|
* Log specified fields for the ag hdr (inode section)
|
|
*/
|
|
void
|
|
xfs_ialloc_log_agi(
|
|
struct xfs_trans *tp, /* transaction pointer */
|
|
struct xfs_buf *bp, /* allocation group header buffer */
|
|
int fields); /* bitmask of fields to log */
|
|
|
|
/*
|
|
* Read in the allocation group header (inode allocation section)
|
|
*/
|
|
int /* error */
|
|
xfs_ialloc_read_agi(
|
|
struct xfs_mount *mp, /* file system mount structure */
|
|
struct xfs_trans *tp, /* transaction pointer */
|
|
xfs_agnumber_t agno, /* allocation group number */
|
|
struct xfs_buf **bpp); /* allocation group hdr buf */
|
|
|
|
/*
|
|
* Read in the allocation group header to initialise the per-ag data
|
|
* in the mount structure
|
|
*/
|
|
int
|
|
xfs_ialloc_pagi_init(
|
|
struct xfs_mount *mp, /* file system mount structure */
|
|
struct xfs_trans *tp, /* transaction pointer */
|
|
xfs_agnumber_t agno); /* allocation group number */
|
|
|
|
/*
|
|
* Lookup a record by ino in the btree given by cur.
|
|
*/
|
|
int xfs_inobt_lookup(struct xfs_btree_cur *cur, xfs_agino_t ino,
|
|
xfs_lookup_t dir, int *stat);
|
|
|
|
/*
|
|
* Get the data from the pointed-to record.
|
|
*/
|
|
int xfs_inobt_get_rec(struct xfs_btree_cur *cur,
|
|
xfs_inobt_rec_incore_t *rec, int *stat);
|
|
|
|
/*
|
|
* Inode chunk initialisation routine
|
|
*/
|
|
int xfs_ialloc_inode_init(struct xfs_mount *mp, struct xfs_trans *tp,
|
|
struct list_head *buffer_list, int icount,
|
|
xfs_agnumber_t agno, xfs_agblock_t agbno,
|
|
xfs_agblock_t length, unsigned int gen);
|
|
|
|
int xfs_read_agi(struct xfs_mount *mp, struct xfs_trans *tp,
|
|
xfs_agnumber_t agno, struct xfs_buf **bpp);
|
|
|
|
union xfs_btree_rec;
|
|
void xfs_inobt_btrec_to_irec(struct xfs_mount *mp, union xfs_btree_rec *rec,
|
|
struct xfs_inobt_rec_incore *irec);
|
|
int xfs_ialloc_has_inodes_at_extent(struct xfs_btree_cur *cur,
|
|
xfs_agblock_t bno, xfs_extlen_t len, bool *exists);
|
|
int xfs_ialloc_has_inode_record(struct xfs_btree_cur *cur, xfs_agino_t low,
|
|
xfs_agino_t high, bool *exists);
|
|
int xfs_ialloc_count_inodes(struct xfs_btree_cur *cur, xfs_agino_t *count,
|
|
xfs_agino_t *freecount);
|
|
int xfs_inobt_insert_rec(struct xfs_btree_cur *cur, uint16_t holemask,
|
|
uint8_t count, int32_t freecount, xfs_inofree_t free,
|
|
int *stat);
|
|
|
|
int xfs_ialloc_cluster_alignment(struct xfs_mount *mp);
|
|
|
|
#endif /* __XFS_IALLOC_H__ */
|