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862 lines
24 KiB
862 lines
24 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* alloc.c - NILFS dat/inode allocator |
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* |
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* Copyright (C) 2006-2008 Nippon Telegraph and Telephone Corporation. |
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* |
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* Originally written by Koji Sato. |
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* Two allocators were unified by Ryusuke Konishi and Amagai Yoshiji. |
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*/ |
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|
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#include <linux/types.h> |
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#include <linux/buffer_head.h> |
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#include <linux/fs.h> |
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#include <linux/bitops.h> |
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#include <linux/slab.h> |
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#include "mdt.h" |
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#include "alloc.h" |
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/** |
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* nilfs_palloc_groups_per_desc_block - get the number of groups that a group |
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* descriptor block can maintain |
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* @inode: inode of metadata file using this allocator |
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*/ |
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static inline unsigned long |
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nilfs_palloc_groups_per_desc_block(const struct inode *inode) |
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{ |
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return i_blocksize(inode) / |
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sizeof(struct nilfs_palloc_group_desc); |
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} |
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|
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/** |
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* nilfs_palloc_groups_count - get maximum number of groups |
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* @inode: inode of metadata file using this allocator |
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*/ |
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static inline unsigned long |
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nilfs_palloc_groups_count(const struct inode *inode) |
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{ |
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return 1UL << (BITS_PER_LONG - (inode->i_blkbits + 3 /* log2(8) */)); |
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} |
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/** |
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* nilfs_palloc_init_blockgroup - initialize private variables for allocator |
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* @inode: inode of metadata file using this allocator |
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* @entry_size: size of the persistent object |
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*/ |
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int nilfs_palloc_init_blockgroup(struct inode *inode, unsigned int entry_size) |
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{ |
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struct nilfs_mdt_info *mi = NILFS_MDT(inode); |
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mi->mi_bgl = kmalloc(sizeof(*mi->mi_bgl), GFP_NOFS); |
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if (!mi->mi_bgl) |
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return -ENOMEM; |
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bgl_lock_init(mi->mi_bgl); |
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nilfs_mdt_set_entry_size(inode, entry_size, 0); |
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mi->mi_blocks_per_group = |
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DIV_ROUND_UP(nilfs_palloc_entries_per_group(inode), |
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mi->mi_entries_per_block) + 1; |
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/* |
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* Number of blocks in a group including entry blocks |
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* and a bitmap block |
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*/ |
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mi->mi_blocks_per_desc_block = |
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nilfs_palloc_groups_per_desc_block(inode) * |
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mi->mi_blocks_per_group + 1; |
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/* |
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* Number of blocks per descriptor including the |
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* descriptor block |
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*/ |
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return 0; |
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} |
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/** |
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* nilfs_palloc_group - get group number and offset from an entry number |
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* @inode: inode of metadata file using this allocator |
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* @nr: serial number of the entry (e.g. inode number) |
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* @offset: pointer to store offset number in the group |
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*/ |
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static unsigned long nilfs_palloc_group(const struct inode *inode, __u64 nr, |
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unsigned long *offset) |
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{ |
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__u64 group = nr; |
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*offset = do_div(group, nilfs_palloc_entries_per_group(inode)); |
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return group; |
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} |
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/** |
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* nilfs_palloc_desc_blkoff - get block offset of a group descriptor block |
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* @inode: inode of metadata file using this allocator |
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* @group: group number |
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* |
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* nilfs_palloc_desc_blkoff() returns block offset of the descriptor |
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* block which contains a descriptor of the specified group. |
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*/ |
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static unsigned long |
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nilfs_palloc_desc_blkoff(const struct inode *inode, unsigned long group) |
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{ |
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unsigned long desc_block = |
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group / nilfs_palloc_groups_per_desc_block(inode); |
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return desc_block * NILFS_MDT(inode)->mi_blocks_per_desc_block; |
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} |
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/** |
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* nilfs_palloc_bitmap_blkoff - get block offset of a bitmap block |
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* @inode: inode of metadata file using this allocator |
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* @group: group number |
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* |
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* nilfs_palloc_bitmap_blkoff() returns block offset of the bitmap |
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* block used to allocate/deallocate entries in the specified group. |
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*/ |
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static unsigned long |
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nilfs_palloc_bitmap_blkoff(const struct inode *inode, unsigned long group) |
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{ |
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unsigned long desc_offset = |
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group % nilfs_palloc_groups_per_desc_block(inode); |
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return nilfs_palloc_desc_blkoff(inode, group) + 1 + |
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desc_offset * NILFS_MDT(inode)->mi_blocks_per_group; |
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} |
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/** |
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* nilfs_palloc_group_desc_nfrees - get the number of free entries in a group |
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* @desc: pointer to descriptor structure for the group |
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* @lock: spin lock protecting @desc |
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*/ |
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static unsigned long |
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nilfs_palloc_group_desc_nfrees(const struct nilfs_palloc_group_desc *desc, |
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spinlock_t *lock) |
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{ |
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unsigned long nfree; |
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spin_lock(lock); |
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nfree = le32_to_cpu(desc->pg_nfrees); |
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spin_unlock(lock); |
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return nfree; |
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} |
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/** |
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* nilfs_palloc_group_desc_add_entries - adjust count of free entries |
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* @desc: pointer to descriptor structure for the group |
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* @lock: spin lock protecting @desc |
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* @n: delta to be added |
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*/ |
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static u32 |
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nilfs_palloc_group_desc_add_entries(struct nilfs_palloc_group_desc *desc, |
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spinlock_t *lock, u32 n) |
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{ |
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u32 nfree; |
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spin_lock(lock); |
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le32_add_cpu(&desc->pg_nfrees, n); |
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nfree = le32_to_cpu(desc->pg_nfrees); |
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spin_unlock(lock); |
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return nfree; |
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} |
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/** |
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* nilfs_palloc_entry_blkoff - get block offset of an entry block |
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* @inode: inode of metadata file using this allocator |
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* @nr: serial number of the entry (e.g. inode number) |
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*/ |
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static unsigned long |
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nilfs_palloc_entry_blkoff(const struct inode *inode, __u64 nr) |
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{ |
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unsigned long group, group_offset; |
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group = nilfs_palloc_group(inode, nr, &group_offset); |
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return nilfs_palloc_bitmap_blkoff(inode, group) + 1 + |
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group_offset / NILFS_MDT(inode)->mi_entries_per_block; |
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} |
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/** |
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* nilfs_palloc_desc_block_init - initialize buffer of a group descriptor block |
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* @inode: inode of metadata file |
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* @bh: buffer head of the buffer to be initialized |
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* @kaddr: kernel address mapped for the page including the buffer |
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*/ |
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static void nilfs_palloc_desc_block_init(struct inode *inode, |
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struct buffer_head *bh, void *kaddr) |
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{ |
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struct nilfs_palloc_group_desc *desc = kaddr + bh_offset(bh); |
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unsigned long n = nilfs_palloc_groups_per_desc_block(inode); |
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__le32 nfrees; |
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nfrees = cpu_to_le32(nilfs_palloc_entries_per_group(inode)); |
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while (n-- > 0) { |
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desc->pg_nfrees = nfrees; |
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desc++; |
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} |
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} |
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static int nilfs_palloc_get_block(struct inode *inode, unsigned long blkoff, |
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int create, |
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void (*init_block)(struct inode *, |
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struct buffer_head *, |
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void *), |
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struct buffer_head **bhp, |
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struct nilfs_bh_assoc *prev, |
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spinlock_t *lock) |
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{ |
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int ret; |
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spin_lock(lock); |
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if (prev->bh && blkoff == prev->blkoff) { |
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get_bh(prev->bh); |
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*bhp = prev->bh; |
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spin_unlock(lock); |
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return 0; |
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} |
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spin_unlock(lock); |
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ret = nilfs_mdt_get_block(inode, blkoff, create, init_block, bhp); |
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if (!ret) { |
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spin_lock(lock); |
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/* |
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* The following code must be safe for change of the |
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* cache contents during the get block call. |
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*/ |
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brelse(prev->bh); |
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get_bh(*bhp); |
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prev->bh = *bhp; |
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prev->blkoff = blkoff; |
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spin_unlock(lock); |
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} |
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return ret; |
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} |
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/** |
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* nilfs_palloc_delete_block - delete a block on the persistent allocator file |
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* @inode: inode of metadata file using this allocator |
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* @blkoff: block offset |
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* @prev: nilfs_bh_assoc struct of the last used buffer |
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* @lock: spin lock protecting @prev |
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*/ |
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static int nilfs_palloc_delete_block(struct inode *inode, unsigned long blkoff, |
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struct nilfs_bh_assoc *prev, |
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spinlock_t *lock) |
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{ |
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spin_lock(lock); |
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if (prev->bh && blkoff == prev->blkoff) { |
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brelse(prev->bh); |
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prev->bh = NULL; |
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} |
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spin_unlock(lock); |
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return nilfs_mdt_delete_block(inode, blkoff); |
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} |
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/** |
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* nilfs_palloc_get_desc_block - get buffer head of a group descriptor block |
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* @inode: inode of metadata file using this allocator |
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* @group: group number |
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* @create: create flag |
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* @bhp: pointer to store the resultant buffer head |
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*/ |
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static int nilfs_palloc_get_desc_block(struct inode *inode, |
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unsigned long group, |
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int create, struct buffer_head **bhp) |
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{ |
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struct nilfs_palloc_cache *cache = NILFS_MDT(inode)->mi_palloc_cache; |
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return nilfs_palloc_get_block(inode, |
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nilfs_palloc_desc_blkoff(inode, group), |
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create, nilfs_palloc_desc_block_init, |
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bhp, &cache->prev_desc, &cache->lock); |
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} |
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/** |
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* nilfs_palloc_get_bitmap_block - get buffer head of a bitmap block |
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* @inode: inode of metadata file using this allocator |
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* @group: group number |
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* @create: create flag |
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* @bhp: pointer to store the resultant buffer head |
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*/ |
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static int nilfs_palloc_get_bitmap_block(struct inode *inode, |
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unsigned long group, |
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int create, struct buffer_head **bhp) |
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{ |
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struct nilfs_palloc_cache *cache = NILFS_MDT(inode)->mi_palloc_cache; |
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return nilfs_palloc_get_block(inode, |
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nilfs_palloc_bitmap_blkoff(inode, group), |
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create, NULL, bhp, |
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&cache->prev_bitmap, &cache->lock); |
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} |
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/** |
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* nilfs_palloc_delete_bitmap_block - delete a bitmap block |
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* @inode: inode of metadata file using this allocator |
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* @group: group number |
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*/ |
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static int nilfs_palloc_delete_bitmap_block(struct inode *inode, |
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unsigned long group) |
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{ |
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struct nilfs_palloc_cache *cache = NILFS_MDT(inode)->mi_palloc_cache; |
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return nilfs_palloc_delete_block(inode, |
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nilfs_palloc_bitmap_blkoff(inode, |
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group), |
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&cache->prev_bitmap, &cache->lock); |
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} |
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/** |
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* nilfs_palloc_get_entry_block - get buffer head of an entry block |
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* @inode: inode of metadata file using this allocator |
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* @nr: serial number of the entry (e.g. inode number) |
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* @create: create flag |
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* @bhp: pointer to store the resultant buffer head |
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*/ |
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int nilfs_palloc_get_entry_block(struct inode *inode, __u64 nr, |
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int create, struct buffer_head **bhp) |
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{ |
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struct nilfs_palloc_cache *cache = NILFS_MDT(inode)->mi_palloc_cache; |
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return nilfs_palloc_get_block(inode, |
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nilfs_palloc_entry_blkoff(inode, nr), |
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create, NULL, bhp, |
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&cache->prev_entry, &cache->lock); |
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} |
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/** |
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* nilfs_palloc_delete_entry_block - delete an entry block |
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* @inode: inode of metadata file using this allocator |
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* @nr: serial number of the entry |
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*/ |
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static int nilfs_palloc_delete_entry_block(struct inode *inode, __u64 nr) |
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{ |
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struct nilfs_palloc_cache *cache = NILFS_MDT(inode)->mi_palloc_cache; |
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return nilfs_palloc_delete_block(inode, |
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nilfs_palloc_entry_blkoff(inode, nr), |
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&cache->prev_entry, &cache->lock); |
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} |
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/** |
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* nilfs_palloc_block_get_group_desc - get kernel address of a group descriptor |
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* @inode: inode of metadata file using this allocator |
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* @group: group number |
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* @bh: buffer head of the buffer storing the group descriptor block |
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* @kaddr: kernel address mapped for the page including the buffer |
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*/ |
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static struct nilfs_palloc_group_desc * |
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nilfs_palloc_block_get_group_desc(const struct inode *inode, |
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unsigned long group, |
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const struct buffer_head *bh, void *kaddr) |
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{ |
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return (struct nilfs_palloc_group_desc *)(kaddr + bh_offset(bh)) + |
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group % nilfs_palloc_groups_per_desc_block(inode); |
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} |
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/** |
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* nilfs_palloc_block_get_entry - get kernel address of an entry |
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* @inode: inode of metadata file using this allocator |
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* @nr: serial number of the entry (e.g. inode number) |
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* @bh: buffer head of the buffer storing the entry block |
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* @kaddr: kernel address mapped for the page including the buffer |
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*/ |
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void *nilfs_palloc_block_get_entry(const struct inode *inode, __u64 nr, |
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const struct buffer_head *bh, void *kaddr) |
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{ |
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unsigned long entry_offset, group_offset; |
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nilfs_palloc_group(inode, nr, &group_offset); |
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entry_offset = group_offset % NILFS_MDT(inode)->mi_entries_per_block; |
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return kaddr + bh_offset(bh) + |
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entry_offset * NILFS_MDT(inode)->mi_entry_size; |
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} |
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/** |
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* nilfs_palloc_find_available_slot - find available slot in a group |
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* @bitmap: bitmap of the group |
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* @target: offset number of an entry in the group (start point) |
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* @bsize: size in bits |
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* @lock: spin lock protecting @bitmap |
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*/ |
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static int nilfs_palloc_find_available_slot(unsigned char *bitmap, |
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unsigned long target, |
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unsigned int bsize, |
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spinlock_t *lock) |
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{ |
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int pos, end = bsize; |
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if (likely(target < bsize)) { |
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pos = target; |
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do { |
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pos = nilfs_find_next_zero_bit(bitmap, end, pos); |
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if (pos >= end) |
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break; |
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if (!nilfs_set_bit_atomic(lock, pos, bitmap)) |
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return pos; |
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} while (++pos < end); |
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end = target; |
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} |
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/* wrap around */ |
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for (pos = 0; pos < end; pos++) { |
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pos = nilfs_find_next_zero_bit(bitmap, end, pos); |
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if (pos >= end) |
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break; |
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if (!nilfs_set_bit_atomic(lock, pos, bitmap)) |
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return pos; |
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} |
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return -ENOSPC; |
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} |
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/** |
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* nilfs_palloc_rest_groups_in_desc_block - get the remaining number of groups |
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* in a group descriptor block |
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* @inode: inode of metadata file using this allocator |
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* @curr: current group number |
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* @max: maximum number of groups |
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*/ |
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static unsigned long |
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nilfs_palloc_rest_groups_in_desc_block(const struct inode *inode, |
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unsigned long curr, unsigned long max) |
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{ |
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return min_t(unsigned long, |
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nilfs_palloc_groups_per_desc_block(inode) - |
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curr % nilfs_palloc_groups_per_desc_block(inode), |
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max - curr + 1); |
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} |
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/** |
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* nilfs_palloc_count_desc_blocks - count descriptor blocks number |
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* @inode: inode of metadata file using this allocator |
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* @desc_blocks: descriptor blocks number [out] |
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*/ |
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static int nilfs_palloc_count_desc_blocks(struct inode *inode, |
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unsigned long *desc_blocks) |
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{ |
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__u64 blknum; |
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int ret; |
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ret = nilfs_bmap_last_key(NILFS_I(inode)->i_bmap, &blknum); |
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if (likely(!ret)) |
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*desc_blocks = DIV_ROUND_UP( |
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(unsigned long)blknum, |
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NILFS_MDT(inode)->mi_blocks_per_desc_block); |
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return ret; |
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} |
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/** |
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* nilfs_palloc_mdt_file_can_grow - check potential opportunity for |
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* MDT file growing |
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* @inode: inode of metadata file using this allocator |
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* @desc_blocks: known current descriptor blocks count |
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*/ |
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static inline bool nilfs_palloc_mdt_file_can_grow(struct inode *inode, |
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unsigned long desc_blocks) |
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{ |
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return (nilfs_palloc_groups_per_desc_block(inode) * desc_blocks) < |
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nilfs_palloc_groups_count(inode); |
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} |
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|
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/** |
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* nilfs_palloc_count_max_entries - count max number of entries that can be |
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* described by descriptor blocks count |
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* @inode: inode of metadata file using this allocator |
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* @nused: current number of used entries |
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* @nmaxp: max number of entries [out] |
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*/ |
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int nilfs_palloc_count_max_entries(struct inode *inode, u64 nused, u64 *nmaxp) |
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{ |
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unsigned long desc_blocks = 0; |
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u64 entries_per_desc_block, nmax; |
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int err; |
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err = nilfs_palloc_count_desc_blocks(inode, &desc_blocks); |
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if (unlikely(err)) |
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return err; |
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entries_per_desc_block = (u64)nilfs_palloc_entries_per_group(inode) * |
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nilfs_palloc_groups_per_desc_block(inode); |
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nmax = entries_per_desc_block * desc_blocks; |
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if (nused == nmax && |
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nilfs_palloc_mdt_file_can_grow(inode, desc_blocks)) |
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nmax += entries_per_desc_block; |
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if (nused > nmax) |
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return -ERANGE; |
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*nmaxp = nmax; |
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return 0; |
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} |
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|
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/** |
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* nilfs_palloc_prepare_alloc_entry - prepare to allocate a persistent object |
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* @inode: inode of metadata file using this allocator |
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* @req: nilfs_palloc_req structure exchanged for the allocation |
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*/ |
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int nilfs_palloc_prepare_alloc_entry(struct inode *inode, |
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struct nilfs_palloc_req *req) |
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{ |
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struct buffer_head *desc_bh, *bitmap_bh; |
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struct nilfs_palloc_group_desc *desc; |
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unsigned char *bitmap; |
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void *desc_kaddr, *bitmap_kaddr; |
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unsigned long group, maxgroup, ngroups; |
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unsigned long group_offset, maxgroup_offset; |
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unsigned long n, entries_per_group; |
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unsigned long i, j; |
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spinlock_t *lock; |
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int pos, ret; |
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ngroups = nilfs_palloc_groups_count(inode); |
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maxgroup = ngroups - 1; |
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group = nilfs_palloc_group(inode, req->pr_entry_nr, &group_offset); |
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entries_per_group = nilfs_palloc_entries_per_group(inode); |
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for (i = 0; i < ngroups; i += n) { |
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if (group >= ngroups) { |
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/* wrap around */ |
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group = 0; |
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maxgroup = nilfs_palloc_group(inode, req->pr_entry_nr, |
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&maxgroup_offset) - 1; |
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} |
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ret = nilfs_palloc_get_desc_block(inode, group, 1, &desc_bh); |
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if (ret < 0) |
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return ret; |
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desc_kaddr = kmap(desc_bh->b_page); |
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desc = nilfs_palloc_block_get_group_desc( |
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inode, group, desc_bh, desc_kaddr); |
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n = nilfs_palloc_rest_groups_in_desc_block(inode, group, |
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maxgroup); |
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for (j = 0; j < n; j++, desc++, group++) { |
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lock = nilfs_mdt_bgl_lock(inode, group); |
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if (nilfs_palloc_group_desc_nfrees(desc, lock) > 0) { |
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ret = nilfs_palloc_get_bitmap_block( |
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inode, group, 1, &bitmap_bh); |
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if (ret < 0) |
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goto out_desc; |
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bitmap_kaddr = kmap(bitmap_bh->b_page); |
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bitmap = bitmap_kaddr + bh_offset(bitmap_bh); |
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pos = nilfs_palloc_find_available_slot( |
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bitmap, group_offset, |
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entries_per_group, lock); |
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if (pos >= 0) { |
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/* found a free entry */ |
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nilfs_palloc_group_desc_add_entries( |
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desc, lock, -1); |
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req->pr_entry_nr = |
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entries_per_group * group + pos; |
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kunmap(desc_bh->b_page); |
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kunmap(bitmap_bh->b_page); |
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|
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req->pr_desc_bh = desc_bh; |
|
req->pr_bitmap_bh = bitmap_bh; |
|
return 0; |
|
} |
|
kunmap(bitmap_bh->b_page); |
|
brelse(bitmap_bh); |
|
} |
|
|
|
group_offset = 0; |
|
} |
|
|
|
kunmap(desc_bh->b_page); |
|
brelse(desc_bh); |
|
} |
|
|
|
/* no entries left */ |
|
return -ENOSPC; |
|
|
|
out_desc: |
|
kunmap(desc_bh->b_page); |
|
brelse(desc_bh); |
|
return ret; |
|
} |
|
|
|
/** |
|
* 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) |
|
{ |
|
mark_buffer_dirty(req->pr_bitmap_bh); |
|
mark_buffer_dirty(req->pr_desc_bh); |
|
nilfs_mdt_mark_dirty(inode); |
|
|
|
brelse(req->pr_bitmap_bh); |
|
brelse(req->pr_desc_bh); |
|
} |
|
|
|
/** |
|
* 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) |
|
{ |
|
struct nilfs_palloc_group_desc *desc; |
|
unsigned long group, group_offset; |
|
unsigned char *bitmap; |
|
void *desc_kaddr, *bitmap_kaddr; |
|
spinlock_t *lock; |
|
|
|
group = nilfs_palloc_group(inode, req->pr_entry_nr, &group_offset); |
|
desc_kaddr = kmap(req->pr_desc_bh->b_page); |
|
desc = nilfs_palloc_block_get_group_desc(inode, group, |
|
req->pr_desc_bh, desc_kaddr); |
|
bitmap_kaddr = kmap(req->pr_bitmap_bh->b_page); |
|
bitmap = bitmap_kaddr + bh_offset(req->pr_bitmap_bh); |
|
lock = nilfs_mdt_bgl_lock(inode, group); |
|
|
|
if (!nilfs_clear_bit_atomic(lock, group_offset, bitmap)) |
|
nilfs_warn(inode->i_sb, |
|
"%s (ino=%lu): entry number %llu already freed", |
|
__func__, inode->i_ino, |
|
(unsigned long long)req->pr_entry_nr); |
|
else |
|
nilfs_palloc_group_desc_add_entries(desc, lock, 1); |
|
|
|
kunmap(req->pr_bitmap_bh->b_page); |
|
kunmap(req->pr_desc_bh->b_page); |
|
|
|
mark_buffer_dirty(req->pr_desc_bh); |
|
mark_buffer_dirty(req->pr_bitmap_bh); |
|
nilfs_mdt_mark_dirty(inode); |
|
|
|
brelse(req->pr_bitmap_bh); |
|
brelse(req->pr_desc_bh); |
|
} |
|
|
|
/** |
|
* 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) |
|
{ |
|
struct nilfs_palloc_group_desc *desc; |
|
void *desc_kaddr, *bitmap_kaddr; |
|
unsigned char *bitmap; |
|
unsigned long group, group_offset; |
|
spinlock_t *lock; |
|
|
|
group = nilfs_palloc_group(inode, req->pr_entry_nr, &group_offset); |
|
desc_kaddr = kmap(req->pr_desc_bh->b_page); |
|
desc = nilfs_palloc_block_get_group_desc(inode, group, |
|
req->pr_desc_bh, desc_kaddr); |
|
bitmap_kaddr = kmap(req->pr_bitmap_bh->b_page); |
|
bitmap = bitmap_kaddr + bh_offset(req->pr_bitmap_bh); |
|
lock = nilfs_mdt_bgl_lock(inode, group); |
|
|
|
if (!nilfs_clear_bit_atomic(lock, group_offset, bitmap)) |
|
nilfs_warn(inode->i_sb, |
|
"%s (ino=%lu): entry number %llu already freed", |
|
__func__, inode->i_ino, |
|
(unsigned long long)req->pr_entry_nr); |
|
else |
|
nilfs_palloc_group_desc_add_entries(desc, lock, 1); |
|
|
|
kunmap(req->pr_bitmap_bh->b_page); |
|
kunmap(req->pr_desc_bh->b_page); |
|
|
|
brelse(req->pr_bitmap_bh); |
|
brelse(req->pr_desc_bh); |
|
|
|
req->pr_entry_nr = 0; |
|
req->pr_bitmap_bh = NULL; |
|
req->pr_desc_bh = NULL; |
|
} |
|
|
|
/** |
|
* 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) |
|
{ |
|
struct buffer_head *desc_bh, *bitmap_bh; |
|
unsigned long group, group_offset; |
|
int ret; |
|
|
|
group = nilfs_palloc_group(inode, req->pr_entry_nr, &group_offset); |
|
ret = nilfs_palloc_get_desc_block(inode, group, 1, &desc_bh); |
|
if (ret < 0) |
|
return ret; |
|
ret = nilfs_palloc_get_bitmap_block(inode, group, 1, &bitmap_bh); |
|
if (ret < 0) { |
|
brelse(desc_bh); |
|
return ret; |
|
} |
|
|
|
req->pr_desc_bh = desc_bh; |
|
req->pr_bitmap_bh = bitmap_bh; |
|
return 0; |
|
} |
|
|
|
/** |
|
* 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) |
|
{ |
|
brelse(req->pr_bitmap_bh); |
|
brelse(req->pr_desc_bh); |
|
|
|
req->pr_entry_nr = 0; |
|
req->pr_bitmap_bh = NULL; |
|
req->pr_desc_bh = NULL; |
|
} |
|
|
|
/** |
|
* 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) |
|
{ |
|
struct buffer_head *desc_bh, *bitmap_bh; |
|
struct nilfs_palloc_group_desc *desc; |
|
unsigned char *bitmap; |
|
void *desc_kaddr, *bitmap_kaddr; |
|
unsigned long group, group_offset; |
|
__u64 group_min_nr, last_nrs[8]; |
|
const unsigned long epg = nilfs_palloc_entries_per_group(inode); |
|
const unsigned int epb = NILFS_MDT(inode)->mi_entries_per_block; |
|
unsigned int entry_start, end, pos; |
|
spinlock_t *lock; |
|
int i, j, k, ret; |
|
u32 nfree; |
|
|
|
for (i = 0; i < nitems; i = j) { |
|
int change_group = false; |
|
int nempties = 0, n = 0; |
|
|
|
group = nilfs_palloc_group(inode, entry_nrs[i], &group_offset); |
|
ret = nilfs_palloc_get_desc_block(inode, group, 0, &desc_bh); |
|
if (ret < 0) |
|
return ret; |
|
ret = nilfs_palloc_get_bitmap_block(inode, group, 0, |
|
&bitmap_bh); |
|
if (ret < 0) { |
|
brelse(desc_bh); |
|
return ret; |
|
} |
|
|
|
/* Get the first entry number of the group */ |
|
group_min_nr = (__u64)group * epg; |
|
|
|
bitmap_kaddr = kmap(bitmap_bh->b_page); |
|
bitmap = bitmap_kaddr + bh_offset(bitmap_bh); |
|
lock = nilfs_mdt_bgl_lock(inode, group); |
|
|
|
j = i; |
|
entry_start = rounddown(group_offset, epb); |
|
do { |
|
if (!nilfs_clear_bit_atomic(lock, group_offset, |
|
bitmap)) { |
|
nilfs_warn(inode->i_sb, |
|
"%s (ino=%lu): entry number %llu already freed", |
|
__func__, inode->i_ino, |
|
(unsigned long long)entry_nrs[j]); |
|
} else { |
|
n++; |
|
} |
|
|
|
j++; |
|
if (j >= nitems || entry_nrs[j] < group_min_nr || |
|
entry_nrs[j] >= group_min_nr + epg) { |
|
change_group = true; |
|
} else { |
|
group_offset = entry_nrs[j] - group_min_nr; |
|
if (group_offset >= entry_start && |
|
group_offset < entry_start + epb) { |
|
/* This entry is in the same block */ |
|
continue; |
|
} |
|
} |
|
|
|
/* Test if the entry block is empty or not */ |
|
end = entry_start + epb; |
|
pos = nilfs_find_next_bit(bitmap, end, entry_start); |
|
if (pos >= end) { |
|
last_nrs[nempties++] = entry_nrs[j - 1]; |
|
if (nempties >= ARRAY_SIZE(last_nrs)) |
|
break; |
|
} |
|
|
|
if (change_group) |
|
break; |
|
|
|
/* Go on to the next entry block */ |
|
entry_start = rounddown(group_offset, epb); |
|
} while (true); |
|
|
|
kunmap(bitmap_bh->b_page); |
|
mark_buffer_dirty(bitmap_bh); |
|
brelse(bitmap_bh); |
|
|
|
for (k = 0; k < nempties; k++) { |
|
ret = nilfs_palloc_delete_entry_block(inode, |
|
last_nrs[k]); |
|
if (ret && ret != -ENOENT) |
|
nilfs_warn(inode->i_sb, |
|
"error %d deleting block that object (entry=%llu, ino=%lu) belongs to", |
|
ret, (unsigned long long)last_nrs[k], |
|
inode->i_ino); |
|
} |
|
|
|
desc_kaddr = kmap_atomic(desc_bh->b_page); |
|
desc = nilfs_palloc_block_get_group_desc( |
|
inode, group, desc_bh, desc_kaddr); |
|
nfree = nilfs_palloc_group_desc_add_entries(desc, lock, n); |
|
kunmap_atomic(desc_kaddr); |
|
mark_buffer_dirty(desc_bh); |
|
nilfs_mdt_mark_dirty(inode); |
|
brelse(desc_bh); |
|
|
|
if (nfree == nilfs_palloc_entries_per_group(inode)) { |
|
ret = nilfs_palloc_delete_bitmap_block(inode, group); |
|
if (ret && ret != -ENOENT) |
|
nilfs_warn(inode->i_sb, |
|
"error %d deleting bitmap block of group=%lu, ino=%lu", |
|
ret, group, inode->i_ino); |
|
} |
|
} |
|
return 0; |
|
} |
|
|
|
void nilfs_palloc_setup_cache(struct inode *inode, |
|
struct nilfs_palloc_cache *cache) |
|
{ |
|
NILFS_MDT(inode)->mi_palloc_cache = cache; |
|
spin_lock_init(&cache->lock); |
|
} |
|
|
|
void nilfs_palloc_clear_cache(struct inode *inode) |
|
{ |
|
struct nilfs_palloc_cache *cache = NILFS_MDT(inode)->mi_palloc_cache; |
|
|
|
spin_lock(&cache->lock); |
|
brelse(cache->prev_desc.bh); |
|
brelse(cache->prev_bitmap.bh); |
|
brelse(cache->prev_entry.bh); |
|
cache->prev_desc.bh = NULL; |
|
cache->prev_bitmap.bh = NULL; |
|
cache->prev_entry.bh = NULL; |
|
spin_unlock(&cache->lock); |
|
} |
|
|
|
void nilfs_palloc_destroy_cache(struct inode *inode) |
|
{ |
|
nilfs_palloc_clear_cache(inode); |
|
NILFS_MDT(inode)->mi_palloc_cache = NULL; |
|
}
|
|
|