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-rw-r--r--ANDROID_3.4.5/fs/nilfs2/alloc.c721
1 files changed, 0 insertions, 721 deletions
diff --git a/ANDROID_3.4.5/fs/nilfs2/alloc.c b/ANDROID_3.4.5/fs/nilfs2/alloc.c
deleted file mode 100644
index eed4d7b2..00000000
--- a/ANDROID_3.4.5/fs/nilfs2/alloc.c
+++ /dev/null
@@ -1,721 +0,0 @@
-/*
- * alloc.c - NILFS dat/inode allocator
- *
- * Copyright (C) 2006-2008 Nippon Telegraph and Telephone Corporation.
- *
- * 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- *
- * Original code was written by Koji Sato <koji@osrg.net>.
- * Two allocators were unified by Ryusuke Konishi <ryusuke@osrg.net>,
- * Amagai Yoshiji <amagai@osrg.net>.
- */
-
-#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)
-{
- return (1UL << inode->i_blkbits) /
- sizeof(struct nilfs_palloc_group_desc);
-}
-
-/**
- * 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)
-{
- return 1UL << (BITS_PER_LONG - (inode->i_blkbits + 3 /* log2(8) */));
-}
-
-/**
- * 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 entry_size)
-{
- struct nilfs_mdt_info *mi = NILFS_MDT(inode);
-
- mi->mi_bgl = kmalloc(sizeof(*mi->mi_bgl), GFP_NOFS);
- if (!mi->mi_bgl)
- return -ENOMEM;
-
- bgl_lock_init(mi->mi_bgl);
-
- nilfs_mdt_set_entry_size(inode, entry_size, 0);
-
- mi->mi_blocks_per_group =
- DIV_ROUND_UP(nilfs_palloc_entries_per_group(inode),
- mi->mi_entries_per_block) + 1;
- /* Number of blocks in a group including entry blocks and
- a bitmap block */
- mi->mi_blocks_per_desc_block =
- nilfs_palloc_groups_per_desc_block(inode) *
- mi->mi_blocks_per_group + 1;
- /* Number of blocks per descriptor including the
- descriptor block */
- return 0;
-}
-
-/**
- * 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)
-{
- __u64 group = nr;
-
- *offset = do_div(group, nilfs_palloc_entries_per_group(inode));
- return group;
-}
-
-/**
- * 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)
-{
- unsigned long desc_block =
- group / nilfs_palloc_groups_per_desc_block(inode);
- return desc_block * NILFS_MDT(inode)->mi_blocks_per_desc_block;
-}
-
-/**
- * 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)
-{
- unsigned long desc_offset =
- group % nilfs_palloc_groups_per_desc_block(inode);
- return nilfs_palloc_desc_blkoff(inode, group) + 1 +
- desc_offset * NILFS_MDT(inode)->mi_blocks_per_group;
-}
-
-/**
- * nilfs_palloc_group_desc_nfrees - get the number of free entries in a group
- * @inode: inode of metadata file using this allocator
- * @group: group number
- * @desc: pointer to descriptor structure for the group
- */
-static unsigned long
-nilfs_palloc_group_desc_nfrees(struct inode *inode, unsigned long group,
- const struct nilfs_palloc_group_desc *desc)
-{
- unsigned long nfree;
-
- spin_lock(nilfs_mdt_bgl_lock(inode, group));
- nfree = le32_to_cpu(desc->pg_nfrees);
- spin_unlock(nilfs_mdt_bgl_lock(inode, group));
- return nfree;
-}
-
-/**
- * nilfs_palloc_group_desc_add_entries - adjust count of free entries
- * @inode: inode of metadata file using this allocator
- * @group: group number
- * @desc: pointer to descriptor structure for the group
- * @n: delta to be added
- */
-static void
-nilfs_palloc_group_desc_add_entries(struct inode *inode,
- unsigned long group,
- struct nilfs_palloc_group_desc *desc,
- u32 n)
-{
- spin_lock(nilfs_mdt_bgl_lock(inode, group));
- le32_add_cpu(&desc->pg_nfrees, n);
- spin_unlock(nilfs_mdt_bgl_lock(inode, group));
-}
-
-/**
- * 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)
-{
- unsigned long group, group_offset;
-
- group = nilfs_palloc_group(inode, nr, &group_offset);
-
- return nilfs_palloc_bitmap_blkoff(inode, group) + 1 +
- group_offset / NILFS_MDT(inode)->mi_entries_per_block;
-}
-
-/**
- * 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)
-{
- struct nilfs_palloc_group_desc *desc = kaddr + bh_offset(bh);
- unsigned long n = nilfs_palloc_groups_per_desc_block(inode);
- __le32 nfrees;
-
- nfrees = cpu_to_le32(nilfs_palloc_entries_per_group(inode));
- while (n-- > 0) {
- desc->pg_nfrees = nfrees;
- desc++;
- }
-}
-
-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)
-{
- int ret;
-
- spin_lock(lock);
- if (prev->bh && blkoff == prev->blkoff) {
- get_bh(prev->bh);
- *bhp = prev->bh;
- spin_unlock(lock);
- return 0;
- }
- spin_unlock(lock);
-
- ret = nilfs_mdt_get_block(inode, blkoff, create, init_block, bhp);
- if (!ret) {
- spin_lock(lock);
- /*
- * The following code must be safe for change of the
- * cache contents during the get block call.
- */
- brelse(prev->bh);
- get_bh(*bhp);
- prev->bh = *bhp;
- prev->blkoff = blkoff;
- spin_unlock(lock);
- }
- return ret;
-}
-
-/**
- * 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)
-{
- struct nilfs_palloc_cache *cache = NILFS_MDT(inode)->mi_palloc_cache;
-
- return nilfs_palloc_get_block(inode,
- nilfs_palloc_desc_blkoff(inode, group),
- create, nilfs_palloc_desc_block_init,
- bhp, &cache->prev_desc, &cache->lock);
-}
-
-/**
- * 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)
-{
- struct nilfs_palloc_cache *cache = NILFS_MDT(inode)->mi_palloc_cache;
-
- return nilfs_palloc_get_block(inode,
- nilfs_palloc_bitmap_blkoff(inode, group),
- create, NULL, bhp,
- &cache->prev_bitmap, &cache->lock);
-}
-
-/**
- * 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)
-{
- struct nilfs_palloc_cache *cache = NILFS_MDT(inode)->mi_palloc_cache;
-
- return nilfs_palloc_get_block(inode,
- nilfs_palloc_entry_blkoff(inode, nr),
- create, NULL, bhp,
- &cache->prev_entry, &cache->lock);
-}
-
-/**
- * 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)
-{
- return (struct nilfs_palloc_group_desc *)(kaddr + bh_offset(bh)) +
- group % nilfs_palloc_groups_per_desc_block(inode);
-}
-
-/**
- * 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)
-{
- unsigned long entry_offset, group_offset;
-
- nilfs_palloc_group(inode, nr, &group_offset);
- entry_offset = group_offset % NILFS_MDT(inode)->mi_entries_per_block;
-
- return kaddr + bh_offset(bh) +
- entry_offset * NILFS_MDT(inode)->mi_entry_size;
-}
-
-/**
- * nilfs_palloc_find_available_slot - find available slot in a group
- * @inode: inode of metadata file using this allocator
- * @group: group number
- * @target: offset number of an entry in the group (start point)
- * @bitmap: bitmap of the group
- * @bsize: size in bits
- */
-static int nilfs_palloc_find_available_slot(struct inode *inode,
- unsigned long group,
- unsigned long target,
- unsigned char *bitmap,
- int bsize)
-{
- int curr, pos, end, i;
-
- if (target > 0) {
- end = (target + BITS_PER_LONG - 1) & ~(BITS_PER_LONG - 1);
- if (end > bsize)
- end = bsize;
- pos = nilfs_find_next_zero_bit(bitmap, end, target);
- if (pos < end &&
- !nilfs_set_bit_atomic(
- nilfs_mdt_bgl_lock(inode, group), pos, bitmap))
- return pos;
- } else
- end = 0;
-
- for (i = 0, curr = end;
- i < bsize;
- i += BITS_PER_LONG, curr += BITS_PER_LONG) {
- /* wrap around */
- if (curr >= bsize)
- curr = 0;
- while (*((unsigned long *)bitmap + curr / BITS_PER_LONG)
- != ~0UL) {
- end = curr + BITS_PER_LONG;
- if (end > bsize)
- end = bsize;
- pos = nilfs_find_next_zero_bit(bitmap, end, curr);
- if ((pos < end) &&
- !nilfs_set_bit_atomic(
- nilfs_mdt_bgl_lock(inode, group), pos,
- bitmap))
- return pos;
- }
- }
- return -ENOSPC;
-}
-
-/**
- * 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)
-{
- return min_t(unsigned long,
- nilfs_palloc_groups_per_desc_block(inode) -
- curr % nilfs_palloc_groups_per_desc_block(inode),
- max - curr + 1);
-}
-
-/**
- * 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
- */
-int nilfs_palloc_prepare_alloc_entry(struct inode *inode,
- struct nilfs_palloc_req *req)
-{
- struct buffer_head *desc_bh, *bitmap_bh;
- struct nilfs_palloc_group_desc *desc;
- unsigned char *bitmap;
- void *desc_kaddr, *bitmap_kaddr;
- unsigned long group, maxgroup, ngroups;
- unsigned long group_offset, maxgroup_offset;
- unsigned long n, entries_per_group, groups_per_desc_block;
- unsigned long i, j;
- int pos, ret;
-
- ngroups = nilfs_palloc_groups_count(inode);
- maxgroup = ngroups - 1;
- group = nilfs_palloc_group(inode, req->pr_entry_nr, &group_offset);
- entries_per_group = nilfs_palloc_entries_per_group(inode);
- groups_per_desc_block = nilfs_palloc_groups_per_desc_block(inode);
-
- for (i = 0; i < ngroups; i += n) {
- if (group >= ngroups) {
- /* wrap around */
- group = 0;
- maxgroup = nilfs_palloc_group(inode, req->pr_entry_nr,
- &maxgroup_offset) - 1;
- }
- ret = nilfs_palloc_get_desc_block(inode, group, 1, &desc_bh);
- if (ret < 0)
- return ret;
- desc_kaddr = kmap(desc_bh->b_page);
- desc = nilfs_palloc_block_get_group_desc(
- inode, group, desc_bh, desc_kaddr);
- n = nilfs_palloc_rest_groups_in_desc_block(inode, group,
- maxgroup);
- for (j = 0; j < n; j++, desc++, group++) {
- if (nilfs_palloc_group_desc_nfrees(inode, group, desc)
- > 0) {
- ret = nilfs_palloc_get_bitmap_block(
- inode, group, 1, &bitmap_bh);
- if (ret < 0)
- goto out_desc;
- bitmap_kaddr = kmap(bitmap_bh->b_page);
- bitmap = bitmap_kaddr + bh_offset(bitmap_bh);
- pos = nilfs_palloc_find_available_slot(
- inode, group, group_offset, bitmap,
- entries_per_group);
- if (pos >= 0) {
- /* found a free entry */
- nilfs_palloc_group_desc_add_entries(
- inode, group, desc, -1);
- req->pr_entry_nr =
- entries_per_group * group + pos;
- kunmap(desc_bh->b_page);
- kunmap(bitmap_bh->b_page);
-
- 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;
-
- 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);
-
- if (!nilfs_clear_bit_atomic(nilfs_mdt_bgl_lock(inode, group),
- group_offset, bitmap))
- printk(KERN_WARNING "%s: entry number %llu already freed\n",
- __func__, (unsigned long long)req->pr_entry_nr);
- else
- nilfs_palloc_group_desc_add_entries(inode, group, desc, 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;
-
- 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);
- if (!nilfs_clear_bit_atomic(nilfs_mdt_bgl_lock(inode, group),
- group_offset, bitmap))
- printk(KERN_WARNING "%s: entry number %llu already freed\n",
- __func__, (unsigned long long)req->pr_entry_nr);
- else
- nilfs_palloc_group_desc_add_entries(inode, group, desc, 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_group_is_in - judge if an entry is in a group
- * @inode: inode of metadata file using this allocator
- * @group: group number
- * @nr: serial number of the entry (e.g. inode number)
- */
-static int
-nilfs_palloc_group_is_in(struct inode *inode, unsigned long group, __u64 nr)
-{
- __u64 first, last;
-
- first = group * nilfs_palloc_entries_per_group(inode);
- last = first + nilfs_palloc_entries_per_group(inode) - 1;
- return (nr >= first) && (nr <= last);
-}
-
-/**
- * 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;
- int i, j, n, ret;
-
- for (i = 0; i < nitems; i = j) {
- 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;
- }
- desc_kaddr = kmap(desc_bh->b_page);
- desc = nilfs_palloc_block_get_group_desc(
- inode, group, desc_bh, desc_kaddr);
- bitmap_kaddr = kmap(bitmap_bh->b_page);
- bitmap = bitmap_kaddr + bh_offset(bitmap_bh);
- for (j = i, n = 0;
- (j < nitems) && nilfs_palloc_group_is_in(inode, group,
- entry_nrs[j]);
- j++) {
- nilfs_palloc_group(inode, entry_nrs[j], &group_offset);
- if (!nilfs_clear_bit_atomic(
- nilfs_mdt_bgl_lock(inode, group),
- group_offset, bitmap)) {
- printk(KERN_WARNING
- "%s: entry number %llu already freed\n",
- __func__,
- (unsigned long long)entry_nrs[j]);
- } else {
- n++;
- }
- }
- nilfs_palloc_group_desc_add_entries(inode, group, desc, n);
-
- kunmap(bitmap_bh->b_page);
- kunmap(desc_bh->b_page);
-
- mark_buffer_dirty(desc_bh);
- mark_buffer_dirty(bitmap_bh);
- nilfs_mdt_mark_dirty(inode);
-
- brelse(bitmap_bh);
- brelse(desc_bh);
- }
- 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;
-}
generated by cgit (git 2.34.1) at 2025-01-09 10:23:34 +0000