// SPDX-License-Identifier: GPL-2.0+ /* * NILFS dat/inode allocator * * Copyright (C) 2006-2008 Nippon Telegraph and Telephone Corporation. * * Originally written by Koji Sato. * Two allocators were unified by Ryusuke Konishi and Amagai Yoshiji. */ #include <linux/types.h> #include <linux/buffer_head.h> #include <linux/fs.h> #include <linux/bitops.h> #include <linux/slab.h> #include "mdt.h" #include "alloc.h" /** * nilfs_palloc_groups_per_desc_block - get the number of groups that a group * descriptor block can maintain * @inode: inode of metadata file using this allocator */ static inline unsigned long nilfs_palloc_groups_per_desc_block(const struct inode *inode) { … } /** * nilfs_palloc_groups_count - get maximum number of groups * @inode: inode of metadata file using this allocator */ static inline unsigned long nilfs_palloc_groups_count(const struct inode *inode) { … } /** * nilfs_palloc_init_blockgroup - initialize private variables for allocator * @inode: inode of metadata file using this allocator * @entry_size: size of the persistent object */ int nilfs_palloc_init_blockgroup(struct inode *inode, unsigned int entry_size) { … } /** * nilfs_palloc_group - get group number and offset from an entry number * @inode: inode of metadata file using this allocator * @nr: serial number of the entry (e.g. inode number) * @offset: pointer to store offset number in the group */ static unsigned long nilfs_palloc_group(const struct inode *inode, __u64 nr, unsigned long *offset) { … } /** * nilfs_palloc_desc_blkoff - get block offset of a group descriptor block * @inode: inode of metadata file using this allocator * @group: group number * * nilfs_palloc_desc_blkoff() returns block offset of the descriptor * block which contains a descriptor of the specified group. */ static unsigned long nilfs_palloc_desc_blkoff(const struct inode *inode, unsigned long group) { … } /** * nilfs_palloc_bitmap_blkoff - get block offset of a bitmap block * @inode: inode of metadata file using this allocator * @group: group number * * nilfs_palloc_bitmap_blkoff() returns block offset of the bitmap * block used to allocate/deallocate entries in the specified group. */ static unsigned long nilfs_palloc_bitmap_blkoff(const struct inode *inode, unsigned long group) { … } /** * nilfs_palloc_group_desc_nfrees - get the number of free entries in a group * @desc: pointer to descriptor structure for the group * @lock: spin lock protecting @desc */ static unsigned long nilfs_palloc_group_desc_nfrees(const struct nilfs_palloc_group_desc *desc, spinlock_t *lock) { … } /** * nilfs_palloc_group_desc_add_entries - adjust count of free entries * @desc: pointer to descriptor structure for the group * @lock: spin lock protecting @desc * @n: delta to be added */ static u32 nilfs_palloc_group_desc_add_entries(struct nilfs_palloc_group_desc *desc, spinlock_t *lock, u32 n) { … } /** * nilfs_palloc_entry_blkoff - get block offset of an entry block * @inode: inode of metadata file using this allocator * @nr: serial number of the entry (e.g. inode number) */ static unsigned long nilfs_palloc_entry_blkoff(const struct inode *inode, __u64 nr) { … } /** * nilfs_palloc_desc_block_init - initialize buffer of a group descriptor block * @inode: inode of metadata file * @bh: buffer head of the buffer to be initialized * @kaddr: kernel address mapped for the page including the buffer */ static void nilfs_palloc_desc_block_init(struct inode *inode, struct buffer_head *bh, void *kaddr) { … } static int nilfs_palloc_get_block(struct inode *inode, unsigned long blkoff, int create, void (*init_block)(struct inode *, struct buffer_head *, void *), struct buffer_head **bhp, struct nilfs_bh_assoc *prev, spinlock_t *lock) { … } /** * nilfs_palloc_delete_block - delete a block on the persistent allocator file * @inode: inode of metadata file using this allocator * @blkoff: block offset * @prev: nilfs_bh_assoc struct of the last used buffer * @lock: spin lock protecting @prev */ static int nilfs_palloc_delete_block(struct inode *inode, unsigned long blkoff, struct nilfs_bh_assoc *prev, spinlock_t *lock) { … } /** * nilfs_palloc_get_desc_block - get buffer head of a group descriptor block * @inode: inode of metadata file using this allocator * @group: group number * @create: create flag * @bhp: pointer to store the resultant buffer head */ static int nilfs_palloc_get_desc_block(struct inode *inode, unsigned long group, int create, struct buffer_head **bhp) { … } /** * nilfs_palloc_get_bitmap_block - get buffer head of a bitmap block * @inode: inode of metadata file using this allocator * @group: group number * @create: create flag * @bhp: pointer to store the resultant buffer head */ static int nilfs_palloc_get_bitmap_block(struct inode *inode, unsigned long group, int create, struct buffer_head **bhp) { … } /** * nilfs_palloc_delete_bitmap_block - delete a bitmap block * @inode: inode of metadata file using this allocator * @group: group number */ static int nilfs_palloc_delete_bitmap_block(struct inode *inode, unsigned long group) { … } /** * nilfs_palloc_get_entry_block - get buffer head of an entry block * @inode: inode of metadata file using this allocator * @nr: serial number of the entry (e.g. inode number) * @create: create flag * @bhp: pointer to store the resultant buffer head */ int nilfs_palloc_get_entry_block(struct inode *inode, __u64 nr, int create, struct buffer_head **bhp) { … } /** * nilfs_palloc_delete_entry_block - delete an entry block * @inode: inode of metadata file using this allocator * @nr: serial number of the entry */ static int nilfs_palloc_delete_entry_block(struct inode *inode, __u64 nr) { … } /** * nilfs_palloc_block_get_group_desc - get kernel address of a group descriptor * @inode: inode of metadata file using this allocator * @group: group number * @bh: buffer head of the buffer storing the group descriptor block * @kaddr: kernel address mapped for the page including the buffer */ static struct nilfs_palloc_group_desc * nilfs_palloc_block_get_group_desc(const struct inode *inode, unsigned long group, const struct buffer_head *bh, void *kaddr) { … } /** * nilfs_palloc_block_get_entry - get kernel address of an entry * @inode: inode of metadata file using this allocator * @nr: serial number of the entry (e.g. inode number) * @bh: buffer head of the buffer storing the entry block * @kaddr: kernel address mapped for the page including the buffer */ void *nilfs_palloc_block_get_entry(const struct inode *inode, __u64 nr, const struct buffer_head *bh, void *kaddr) { … } /** * nilfs_palloc_find_available_slot - find available slot in a group * @bitmap: bitmap of the group * @target: offset number of an entry in the group (start point) * @bsize: size in bits * @lock: spin lock protecting @bitmap * @wrap: whether to wrap around */ static int nilfs_palloc_find_available_slot(unsigned char *bitmap, unsigned long target, unsigned int bsize, spinlock_t *lock, bool wrap) { … } /** * nilfs_palloc_rest_groups_in_desc_block - get the remaining number of groups * in a group descriptor block * @inode: inode of metadata file using this allocator * @curr: current group number * @max: maximum number of groups */ static unsigned long nilfs_palloc_rest_groups_in_desc_block(const struct inode *inode, unsigned long curr, unsigned long max) { … } /** * nilfs_palloc_count_desc_blocks - count descriptor blocks number * @inode: inode of metadata file using this allocator * @desc_blocks: descriptor blocks number [out] */ static int nilfs_palloc_count_desc_blocks(struct inode *inode, unsigned long *desc_blocks) { … } /** * nilfs_palloc_mdt_file_can_grow - check potential opportunity for * MDT file growing * @inode: inode of metadata file using this allocator * @desc_blocks: known current descriptor blocks count */ static inline bool nilfs_palloc_mdt_file_can_grow(struct inode *inode, unsigned long desc_blocks) { … } /** * nilfs_palloc_count_max_entries - count max number of entries that can be * described by descriptor blocks count * @inode: inode of metadata file using this allocator * @nused: current number of used entries * @nmaxp: max number of entries [out] */ int nilfs_palloc_count_max_entries(struct inode *inode, u64 nused, u64 *nmaxp) { … } /** * nilfs_palloc_prepare_alloc_entry - prepare to allocate a persistent object * @inode: inode of metadata file using this allocator * @req: nilfs_palloc_req structure exchanged for the allocation * @wrap: whether to wrap around */ int nilfs_palloc_prepare_alloc_entry(struct inode *inode, struct nilfs_palloc_req *req, bool wrap) { … } /** * nilfs_palloc_commit_alloc_entry - finish allocation of a persistent object * @inode: inode of metadata file using this allocator * @req: nilfs_palloc_req structure exchanged for the allocation */ void nilfs_palloc_commit_alloc_entry(struct inode *inode, struct nilfs_palloc_req *req) { … } /** * nilfs_palloc_commit_free_entry - finish deallocating a persistent object * @inode: inode of metadata file using this allocator * @req: nilfs_palloc_req structure exchanged for the removal */ void nilfs_palloc_commit_free_entry(struct inode *inode, struct nilfs_palloc_req *req) { … } /** * nilfs_palloc_abort_alloc_entry - cancel allocation of a persistent object * @inode: inode of metadata file using this allocator * @req: nilfs_palloc_req structure exchanged for the allocation */ void nilfs_palloc_abort_alloc_entry(struct inode *inode, struct nilfs_palloc_req *req) { … } /** * nilfs_palloc_prepare_free_entry - prepare to deallocate a persistent object * @inode: inode of metadata file using this allocator * @req: nilfs_palloc_req structure exchanged for the removal */ int nilfs_palloc_prepare_free_entry(struct inode *inode, struct nilfs_palloc_req *req) { … } /** * nilfs_palloc_abort_free_entry - cancel deallocating a persistent object * @inode: inode of metadata file using this allocator * @req: nilfs_palloc_req structure exchanged for the removal */ void nilfs_palloc_abort_free_entry(struct inode *inode, struct nilfs_palloc_req *req) { … } /** * nilfs_palloc_freev - deallocate a set of persistent objects * @inode: inode of metadata file using this allocator * @entry_nrs: array of entry numbers to be deallocated * @nitems: number of entries stored in @entry_nrs */ int nilfs_palloc_freev(struct inode *inode, __u64 *entry_nrs, size_t nitems) { … } void nilfs_palloc_setup_cache(struct inode *inode, struct nilfs_palloc_cache *cache) { … } void nilfs_palloc_clear_cache(struct inode *inode) { … } void nilfs_palloc_destroy_cache(struct inode *inode) { … }
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