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fs/xfs/xfs_ialloc.h
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/* |
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* Copyright (c) 2000,2005 Silicon Graphics, Inc. * All Rights Reserved. |
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* |
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* This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as |
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* published by the Free Software Foundation. * |
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* This program is distributed in the hope that it would be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License * along with this program; if not, write the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ #ifndef __XFS_IALLOC_H__ #define __XFS_IALLOC_H__ struct xfs_buf; struct xfs_dinode; |
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struct xfs_imap; |
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struct xfs_mount; struct xfs_trans; /* * Allocation parameters for inode allocation. */ |
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#define XFS_IALLOC_INODES(mp) (mp)->m_ialloc_inos #define XFS_IALLOC_BLOCKS(mp) (mp)->m_ialloc_blks |
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/* |
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* Move inodes in clusters of this size. |
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*/ #define XFS_INODE_BIG_CLUSTER_SIZE 8192 |
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#define XFS_INODE_CLUSTER_SIZE(mp) (mp)->m_inode_cluster_size /* * Make an inode pointer out of the buffer/offset. */ |
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static inline struct xfs_dinode * xfs_make_iptr(struct xfs_mount *mp, struct xfs_buf *b, int o) { return (xfs_dinode_t *) (xfs_buf_offset(b, o << (mp)->m_sb.sb_inodelog)); } |
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/* * Find a free (set) bit in the inode bitmask. */ |
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static inline int xfs_ialloc_find_free(xfs_inofree_t *fp) { return xfs_lowbit64(*fp); } |
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/* * 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) */ |
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umode_t mode, /* mode bits for new inode */ |
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int okalloc, /* ok to allocate more space */ struct xfs_buf **agbp, /* buf for a.g. inode header */ boolean_t *alloc_done, /* an allocation was done to replenish the free inodes */ 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_bmap_free *flist, /* extents to free */ int *delete, /* set if inode cluster was deleted */ xfs_ino_t *first_ino); /* first inode in deleted cluster */ /* |
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* Return the location of the inode in imap, for mapping it into a buffer. |
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*/ int |
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xfs_imap( |
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struct xfs_mount *mp, /* file system mount structure */ struct xfs_trans *tp, /* transaction pointer */ xfs_ino_t ino, /* inode to locate */ |
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struct xfs_imap *imap, /* location map structure */ |
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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 */ |
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/* * 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 */ |
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/* |
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* Lookup a record by ino in the btree given by cur. |
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*/ |
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int xfs_inobt_lookup(struct xfs_btree_cur *cur, xfs_agino_t ino, xfs_lookup_t dir, int *stat); |
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/* * Get the data from the pointed-to record. */ |
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extern int xfs_inobt_get_rec(struct xfs_btree_cur *cur, xfs_inobt_rec_incore_t *rec, int *stat); |
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#endif /* __XFS_IALLOC_H__ */ |