]>
git.ipfire.org Git - thirdparty/xfsprogs-dev.git/blob - libxfs/xfs_ialloc.h
1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (c) 2000,2005 Silicon Graphics, Inc.
6 #ifndef __XFS_IALLOC_H__
7 #define __XFS_IALLOC_H__
16 /* Move inodes in clusters of this size */
17 #define XFS_INODE_BIG_CLUSTER_SIZE 8192
20 bool deleted
; /* record is deleted */
21 xfs_ino_t first_ino
; /* first inode number */
22 uint64_t alloc
; /* inode phys. allocation bitmap for
26 /* Calculate and return the number of filesystem blocks per inode cluster */
28 xfs_icluster_size_fsb(
31 if (mp
->m_sb
.sb_blocksize
>= mp
->m_inode_cluster_size
)
33 return mp
->m_inode_cluster_size
>> mp
->m_sb
.sb_blocklog
;
37 * Make an inode pointer out of the buffer/offset.
39 static inline struct xfs_dinode
*
40 xfs_make_iptr(struct xfs_mount
*mp
, struct xfs_buf
*b
, int o
)
42 return xfs_buf_offset(b
, o
<< (mp
)->m_sb
.sb_inodelog
);
46 * Allocate an inode on disk.
47 * Mode is used to tell whether the new inode will need space, and whether
50 * To work within the constraint of one allocation per transaction,
51 * xfs_dialloc() is designed to be called twice if it has to do an
52 * allocation to make more free inodes. If an inode is
53 * available without an allocation, agbp would be set to the current
54 * agbp and alloc_done set to false.
55 * If an allocation needed to be done, agbp would be set to the
56 * inode header of the allocation group and alloc_done set to true.
57 * The caller should then commit the current transaction and allocate a new
58 * transaction. xfs_dialloc() should then be called again with
59 * the agbp value returned from the previous call.
61 * Once we successfully pick an inode its number is returned and the
62 * on-disk data structures are updated. The inode itself is not read
63 * in, since doing so would break ordering constraints with xfs_reclaim.
65 * *agbp should be set to NULL on the first call, *alloc_done set to FALSE.
69 struct xfs_trans
*tp
, /* transaction pointer */
70 xfs_ino_t parent
, /* parent inode (directory) */
71 umode_t mode
, /* mode bits for new inode */
72 struct xfs_buf
**agbp
, /* buf for a.g. inode header */
73 xfs_ino_t
*inop
); /* inode number allocated */
76 * Free disk inode. Carefully avoids touching the incore inode, all
77 * manipulations incore are the caller's responsibility.
78 * The on-disk inode is not changed by this operation, only the
79 * btree (free inode mask) is changed.
83 struct xfs_trans
*tp
, /* transaction pointer */
84 xfs_ino_t inode
, /* inode to be freed */
85 struct xfs_icluster
*ifree
); /* cluster info if deleted */
88 * Return the location of the inode in imap, for mapping it into a buffer.
92 struct xfs_mount
*mp
, /* file system mount structure */
93 struct xfs_trans
*tp
, /* transaction pointer */
94 xfs_ino_t ino
, /* inode to locate */
95 struct xfs_imap
*imap
, /* location map structure */
96 uint flags
); /* flags for inode btree lookup */
99 * Compute and fill in value of m_in_maxlevels.
102 xfs_ialloc_compute_maxlevels(
103 struct xfs_mount
*mp
); /* file system mount structure */
106 * Log specified fields for the ag hdr (inode section)
110 struct xfs_trans
*tp
, /* transaction pointer */
111 struct xfs_buf
*bp
, /* allocation group header buffer */
112 int fields
); /* bitmask of fields to log */
115 * Read in the allocation group header (inode allocation section)
119 struct xfs_mount
*mp
, /* file system mount structure */
120 struct xfs_trans
*tp
, /* transaction pointer */
121 xfs_agnumber_t agno
, /* allocation group number */
122 struct xfs_buf
**bpp
); /* allocation group hdr buf */
125 * Read in the allocation group header to initialise the per-ag data
126 * in the mount structure
129 xfs_ialloc_pagi_init(
130 struct xfs_mount
*mp
, /* file system mount structure */
131 struct xfs_trans
*tp
, /* transaction pointer */
132 xfs_agnumber_t agno
); /* allocation group number */
135 * Lookup a record by ino in the btree given by cur.
137 int xfs_inobt_lookup(struct xfs_btree_cur
*cur
, xfs_agino_t ino
,
138 xfs_lookup_t dir
, int *stat
);
141 * Get the data from the pointed-to record.
143 int xfs_inobt_get_rec(struct xfs_btree_cur
*cur
,
144 xfs_inobt_rec_incore_t
*rec
, int *stat
);
147 * Inode chunk initialisation routine
149 int xfs_ialloc_inode_init(struct xfs_mount
*mp
, struct xfs_trans
*tp
,
150 struct list_head
*buffer_list
, int icount
,
151 xfs_agnumber_t agno
, xfs_agblock_t agbno
,
152 xfs_agblock_t length
, unsigned int gen
);
154 int xfs_read_agi(struct xfs_mount
*mp
, struct xfs_trans
*tp
,
155 xfs_agnumber_t agno
, struct xfs_buf
**bpp
);
158 void xfs_inobt_btrec_to_irec(struct xfs_mount
*mp
, union xfs_btree_rec
*rec
,
159 struct xfs_inobt_rec_incore
*irec
);
160 int xfs_ialloc_has_inodes_at_extent(struct xfs_btree_cur
*cur
,
161 xfs_agblock_t bno
, xfs_extlen_t len
, bool *exists
);
162 int xfs_ialloc_has_inode_record(struct xfs_btree_cur
*cur
, xfs_agino_t low
,
163 xfs_agino_t high
, bool *exists
);
164 int xfs_ialloc_count_inodes(struct xfs_btree_cur
*cur
, xfs_agino_t
*count
,
165 xfs_agino_t
*freecount
);
166 int xfs_inobt_insert_rec(struct xfs_btree_cur
*cur
, uint16_t holemask
,
167 uint8_t count
, int32_t freecount
, xfs_inofree_t free
,
170 int xfs_ialloc_cluster_alignment(struct xfs_mount
*mp
);
172 #endif /* __XFS_IALLOC_H__ */