linux/fs/nilfs2/alloc.c

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/*
* 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 cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 08:04:11 +00:00
#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;
}