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Diffstat (limited to 'kernel/fs/ocfs2/suballoc.h')
| -rw-r--r-- | kernel/fs/ocfs2/suballoc.h | 237 |
1 files changed, 237 insertions, 0 deletions
diff --git a/kernel/fs/ocfs2/suballoc.h b/kernel/fs/ocfs2/suballoc.h new file mode 100644 index 000000000..2d2501767 --- /dev/null +++ b/kernel/fs/ocfs2/suballoc.h @@ -0,0 +1,237 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * suballoc.h + * + * Defines sub allocator api + * + * Copyright (C) 2003, 2004 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will 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. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + +#ifndef _CHAINALLOC_H_ +#define _CHAINALLOC_H_ + +struct ocfs2_suballoc_result; +typedef int (group_search_t)(struct inode *, + struct buffer_head *, + u32, /* bits_wanted */ + u32, /* min_bits */ + u64, /* max_block */ + struct ocfs2_suballoc_result *); + /* found bits */ + +struct ocfs2_alloc_context { + struct inode *ac_inode; /* which bitmap are we allocating from? */ + struct buffer_head *ac_bh; /* file entry bh */ + u32 ac_alloc_slot; /* which slot are we allocating from? */ + u32 ac_bits_wanted; + u32 ac_bits_given; +#define OCFS2_AC_USE_LOCAL 1 +#define OCFS2_AC_USE_MAIN 2 +#define OCFS2_AC_USE_INODE 3 +#define OCFS2_AC_USE_META 4 + u32 ac_which; + + /* these are used by the chain search */ + u16 ac_chain; + int ac_disable_chain_relink; + group_search_t *ac_group_search; + + u64 ac_last_group; + u64 ac_max_block; /* Highest block number to allocate. 0 is + is the same as ~0 - unlimited */ + + int ac_find_loc_only; /* hack for reflink operation ordering */ + struct ocfs2_suballoc_result *ac_find_loc_priv; /* */ + + struct ocfs2_alloc_reservation *ac_resv; +}; + +void ocfs2_init_steal_slots(struct ocfs2_super *osb); +void ocfs2_free_alloc_context(struct ocfs2_alloc_context *ac); +static inline int ocfs2_alloc_context_bits_left(struct ocfs2_alloc_context *ac) +{ + return ac->ac_bits_wanted - ac->ac_bits_given; +} + +/* + * Please note that the caller must make sure that root_el is the root + * of extent tree. So for an inode, it should be &fe->id2.i_list. Otherwise + * the result may be wrong. + */ +int ocfs2_reserve_new_metadata(struct ocfs2_super *osb, + struct ocfs2_extent_list *root_el, + struct ocfs2_alloc_context **ac); +int ocfs2_reserve_new_metadata_blocks(struct ocfs2_super *osb, + int blocks, + struct ocfs2_alloc_context **ac); +int ocfs2_reserve_new_inode(struct ocfs2_super *osb, + struct ocfs2_alloc_context **ac); +int ocfs2_reserve_clusters(struct ocfs2_super *osb, + u32 bits_wanted, + struct ocfs2_alloc_context **ac); + +int ocfs2_alloc_dinode_update_counts(struct inode *inode, + handle_t *handle, + struct buffer_head *di_bh, + u32 num_bits, + u16 chain); +void ocfs2_rollback_alloc_dinode_counts(struct inode *inode, + struct buffer_head *di_bh, + u32 num_bits, + u16 chain); +int ocfs2_block_group_set_bits(handle_t *handle, + struct inode *alloc_inode, + struct ocfs2_group_desc *bg, + struct buffer_head *group_bh, + unsigned int bit_off, + unsigned int num_bits); + +int ocfs2_claim_metadata(handle_t *handle, + struct ocfs2_alloc_context *ac, + u32 bits_wanted, + u64 *suballoc_loc, + u16 *suballoc_bit_start, + u32 *num_bits, + u64 *blkno_start); +int ocfs2_claim_new_inode(handle_t *handle, + struct inode *dir, + struct buffer_head *parent_fe_bh, + struct ocfs2_alloc_context *ac, + u64 *suballoc_loc, + u16 *suballoc_bit, + u64 *fe_blkno); +int ocfs2_claim_clusters(handle_t *handle, + struct ocfs2_alloc_context *ac, + u32 min_clusters, + u32 *cluster_start, + u32 *num_clusters); +/* + * Use this variant of ocfs2_claim_clusters to specify a maxiumum + * number of clusters smaller than the allocation reserved. + */ +int __ocfs2_claim_clusters(handle_t *handle, + struct ocfs2_alloc_context *ac, + u32 min_clusters, + u32 max_clusters, + u32 *cluster_start, + u32 *num_clusters); + +int ocfs2_free_suballoc_bits(handle_t *handle, + struct inode *alloc_inode, + struct buffer_head *alloc_bh, + unsigned int start_bit, + u64 bg_blkno, + unsigned int count); +int ocfs2_free_dinode(handle_t *handle, + struct inode *inode_alloc_inode, + struct buffer_head *inode_alloc_bh, + struct ocfs2_dinode *di); +int ocfs2_free_clusters(handle_t *handle, + struct inode *bitmap_inode, + struct buffer_head *bitmap_bh, + u64 start_blk, + unsigned int num_clusters); +int ocfs2_release_clusters(handle_t *handle, + struct inode *bitmap_inode, + struct buffer_head *bitmap_bh, + u64 start_blk, + unsigned int num_clusters); + +static inline u64 ocfs2_which_suballoc_group(u64 block, unsigned int bit) +{ + u64 group = block - (u64) bit; + + return group; +} + +static inline u32 ocfs2_cluster_from_desc(struct ocfs2_super *osb, + u64 bg_blkno) +{ + /* This should work for all block group descriptors as only + * the 1st group descriptor of the cluster bitmap is + * different. */ + + if (bg_blkno == osb->first_cluster_group_blkno) + return 0; + + /* the rest of the block groups are located at the beginning + * of their 1st cluster, so a direct translation just + * works. */ + return ocfs2_blocks_to_clusters(osb->sb, bg_blkno); +} + +static inline int ocfs2_is_cluster_bitmap(struct inode *inode) +{ + struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); + return osb->bitmap_blkno == OCFS2_I(inode)->ip_blkno; +} + +/* This is for local alloc ONLY. Others should use the task-specific + * apis above. */ +int ocfs2_reserve_cluster_bitmap_bits(struct ocfs2_super *osb, + struct ocfs2_alloc_context *ac); +void ocfs2_free_ac_resource(struct ocfs2_alloc_context *ac); + +/* given a cluster offset, calculate which block group it belongs to + * and return that block offset. */ +u64 ocfs2_which_cluster_group(struct inode *inode, u32 cluster); + +/* + * By default, ocfs2_read_group_descriptor() calls ocfs2_error() when it + * finds a problem. A caller that wants to check a group descriptor + * without going readonly should read the block with ocfs2_read_block[s]() + * and then checking it with this function. This is only resize, really. + * Everyone else should be using ocfs2_read_group_descriptor(). + */ +int ocfs2_check_group_descriptor(struct super_block *sb, + struct ocfs2_dinode *di, + struct buffer_head *bh); +/* + * Read a group descriptor block into *bh. If *bh is NULL, a bh will be + * allocated. This is a cached read. The descriptor will be validated with + * ocfs2_validate_group_descriptor(). + */ +int ocfs2_read_group_descriptor(struct inode *inode, struct ocfs2_dinode *di, + u64 gd_blkno, struct buffer_head **bh); + +int ocfs2_lock_allocators(struct inode *inode, struct ocfs2_extent_tree *et, + u32 clusters_to_add, u32 extents_to_split, + struct ocfs2_alloc_context **data_ac, + struct ocfs2_alloc_context **meta_ac); + +int ocfs2_test_inode_bit(struct ocfs2_super *osb, u64 blkno, int *res); + + + +/* + * The following two interfaces are for ocfs2_create_inode_in_orphan(). + */ +int ocfs2_find_new_inode_loc(struct inode *dir, + struct buffer_head *parent_fe_bh, + struct ocfs2_alloc_context *ac, + u64 *fe_blkno); + +int ocfs2_claim_new_inode_at_loc(handle_t *handle, + struct inode *dir, + struct ocfs2_alloc_context *ac, + u64 *suballoc_loc, + u16 *suballoc_bit, + u64 di_blkno); + +#endif /* _CHAINALLOC_H_ */ |