diff options
Diffstat (limited to 'fs/xfs/libxfs/xfs_ialloc.h')
| -rw-r--r-- | fs/xfs/libxfs/xfs_ialloc.h | 172 |
1 files changed, 172 insertions, 0 deletions
diff --git a/fs/xfs/libxfs/xfs_ialloc.h b/fs/xfs/libxfs/xfs_ialloc.h new file mode 100644 index 000000000..e936b7cc9 --- /dev/null +++ b/fs/xfs/libxfs/xfs_ialloc.h @@ -0,0 +1,172 @@ +// 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__ */ |