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git.proxmox.com Git - mirror_ubuntu-jammy-kernel.git/blob - fs/xfs/libxfs/xfs_ialloc.h
2 * Copyright (c) 2000,2005 Silicon Graphics, Inc.
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation.
9 * This program is distributed in the hope that it would be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18 #ifndef __XFS_IALLOC_H__
19 #define __XFS_IALLOC_H__
28 /* Move inodes in clusters of this size */
29 #define XFS_INODE_BIG_CLUSTER_SIZE 8192
32 bool deleted
; /* record is deleted */
33 xfs_ino_t first_ino
; /* first inode number */
34 uint64_t alloc
; /* inode phys. allocation bitmap for
38 /* Calculate and return the number of filesystem blocks per inode cluster */
40 xfs_icluster_size_fsb(
43 if (mp
->m_sb
.sb_blocksize
>= mp
->m_inode_cluster_size
)
45 return mp
->m_inode_cluster_size
>> mp
->m_sb
.sb_blocklog
;
49 * Make an inode pointer out of the buffer/offset.
51 static inline struct xfs_dinode
*
52 xfs_make_iptr(struct xfs_mount
*mp
, struct xfs_buf
*b
, int o
)
54 return xfs_buf_offset(b
, o
<< (mp
)->m_sb
.sb_inodelog
);
58 * Allocate an inode on disk.
59 * Mode is used to tell whether the new inode will need space, and whether
62 * To work within the constraint of one allocation per transaction,
63 * xfs_dialloc() is designed to be called twice if it has to do an
64 * allocation to make more free inodes. If an inode is
65 * available without an allocation, agbp would be set to the current
66 * agbp and alloc_done set to false.
67 * If an allocation needed to be done, agbp would be set to the
68 * inode header of the allocation group and alloc_done set to true.
69 * The caller should then commit the current transaction and allocate a new
70 * transaction. xfs_dialloc() should then be called again with
71 * the agbp value returned from the previous call.
73 * Once we successfully pick an inode its number is returned and the
74 * on-disk data structures are updated. The inode itself is not read
75 * in, since doing so would break ordering constraints with xfs_reclaim.
77 * *agbp should be set to NULL on the first call, *alloc_done set to FALSE.
81 struct xfs_trans
*tp
, /* transaction pointer */
82 xfs_ino_t parent
, /* parent inode (directory) */
83 umode_t mode
, /* mode bits for new inode */
84 struct xfs_buf
**agbp
, /* buf for a.g. inode header */
85 xfs_ino_t
*inop
); /* inode number allocated */
88 * Free disk inode. Carefully avoids touching the incore inode, all
89 * manipulations incore are the caller's responsibility.
90 * The on-disk inode is not changed by this operation, only the
91 * btree (free inode mask) is changed.
95 struct xfs_trans
*tp
, /* transaction pointer */
96 xfs_ino_t inode
, /* inode to be freed */
97 struct xfs_defer_ops
*dfops
, /* extents to free */
98 struct xfs_icluster
*ifree
); /* cluster info if deleted */
101 * Return the location of the inode in imap, for mapping it into a buffer.
105 struct xfs_mount
*mp
, /* file system mount structure */
106 struct xfs_trans
*tp
, /* transaction pointer */
107 xfs_ino_t ino
, /* inode to locate */
108 struct xfs_imap
*imap
, /* location map structure */
109 uint flags
); /* flags for inode btree lookup */
112 * Compute and fill in value of m_in_maxlevels.
115 xfs_ialloc_compute_maxlevels(
116 struct xfs_mount
*mp
); /* file system mount structure */
119 * Log specified fields for the ag hdr (inode section)
123 struct xfs_trans
*tp
, /* transaction pointer */
124 struct xfs_buf
*bp
, /* allocation group header buffer */
125 int fields
); /* bitmask of fields to log */
128 * Read in the allocation group header (inode allocation section)
132 struct xfs_mount
*mp
, /* file system mount structure */
133 struct xfs_trans
*tp
, /* transaction pointer */
134 xfs_agnumber_t agno
, /* allocation group number */
135 struct xfs_buf
**bpp
); /* allocation group hdr buf */
138 * Read in the allocation group header to initialise the per-ag data
139 * in the mount structure
142 xfs_ialloc_pagi_init(
143 struct xfs_mount
*mp
, /* file system mount structure */
144 struct xfs_trans
*tp
, /* transaction pointer */
145 xfs_agnumber_t agno
); /* allocation group number */
148 * Lookup a record by ino in the btree given by cur.
150 int xfs_inobt_lookup(struct xfs_btree_cur
*cur
, xfs_agino_t ino
,
151 xfs_lookup_t dir
, int *stat
);
154 * Get the data from the pointed-to record.
156 int xfs_inobt_get_rec(struct xfs_btree_cur
*cur
,
157 xfs_inobt_rec_incore_t
*rec
, int *stat
);
160 * Inode chunk initialisation routine
162 int xfs_ialloc_inode_init(struct xfs_mount
*mp
, struct xfs_trans
*tp
,
163 struct list_head
*buffer_list
, int icount
,
164 xfs_agnumber_t agno
, xfs_agblock_t agbno
,
165 xfs_agblock_t length
, unsigned int gen
);
167 int xfs_read_agi(struct xfs_mount
*mp
, struct xfs_trans
*tp
,
168 xfs_agnumber_t agno
, struct xfs_buf
**bpp
);
171 void xfs_inobt_btrec_to_irec(struct xfs_mount
*mp
, union xfs_btree_rec
*rec
,
172 struct xfs_inobt_rec_incore
*irec
);
174 int xfs_ialloc_cluster_alignment(struct xfs_mount
*mp
);
175 void xfs_ialloc_agino_range(struct xfs_mount
*mp
, xfs_agnumber_t agno
,
176 xfs_agino_t
*first
, xfs_agino_t
*last
);
177 bool xfs_verify_agino(struct xfs_mount
*mp
, xfs_agnumber_t agno
,
179 bool xfs_verify_ino(struct xfs_mount
*mp
, xfs_ino_t ino
);
180 bool xfs_internal_inum(struct xfs_mount
*mp
, xfs_ino_t ino
);
181 bool xfs_verify_dir_ino(struct xfs_mount
*mp
, xfs_ino_t ino
);
183 #endif /* __XFS_IALLOC_H__ */