/*
* Implementation of operations over local quota file
*/
#include <linux/fs.h>
#include <linux/quota.h>
#include <linux/quotaops.h>
#include <linux/module.h>
#define MLOG_MASK_PREFIX ML_QUOTA
#include <cluster/masklog.h>
#include "ocfs2_fs.h"
#include "ocfs2.h"
#include "inode.h"
#include "alloc.h"
#include "file.h"
#include "buffer_head_io.h"
#include "journal.h"
#include "sysfile.h"
#include "dlmglue.h"
#include "quota.h"
/* Number of local quota structures per block */
static inline unsigned int ol_quota_entries_per_block(struct super_block *sb)
{
return ((sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE) /
sizeof(struct ocfs2_local_disk_dqblk));
}
/* Number of blocks with entries in one chunk */
static inline unsigned int ol_chunk_blocks(struct super_block *sb)
{
return ((sb->s_blocksize - sizeof(struct ocfs2_local_disk_chunk) -
OCFS2_QBLK_RESERVED_SPACE) << 3) /
ol_quota_entries_per_block(sb);
}
/* Number of entries in a chunk bitmap */
static unsigned int ol_chunk_entries(struct super_block *sb)
{
return ol_chunk_blocks(sb) * ol_quota_entries_per_block(sb);
}
/* Offset of the chunk in quota file */
static unsigned int ol_quota_chunk_block(struct super_block *sb, int c)
{
/* 1 block for local quota file info, 1 block per chunk for chunk info */
return 1 + (ol_chunk_blocks(sb) + 1) * c;
}
/* Offset of the dquot structure in the quota file */
static loff_t ol_dqblk_off(struct super_block *sb, int c, int off)
{
int epb = ol_quota_entries_per_block(sb);
return ((ol_quota_chunk_block(sb, c) + 1 + off / epb)
<< sb->s_blocksize_bits) +
(off % epb) * sizeof(struct ocfs2_local_disk_dqblk);
}
/* Compute block number from given offset */
static inline unsigned int ol_dqblk_file_block(struct super_block *sb, loff_t off)
{
return off >> sb->s_blocksize_bits;
}
static inline unsigned int ol_dqblk_block_offset(struct super_block *sb, loff_t off)
{
return off & ((1 << sb->s_blocksize_bits) - 1);
}
/* Compute offset in the chunk of a structure with the given offset */
static int ol_dqblk_chunk_off(struct super_block *sb, int c, loff_t off)
{
int epb = ol_quota_entries_per_block(sb);
return ((off >> sb->s_blocksize_bits) -
ol_quota_chunk_block(sb, c) - 1) * epb
+ ((unsigned int)(off & ((1 << sb->s_blocksize_bits) - 1))) /
sizeof(struct ocfs2_local_disk_dqblk);
}
/* Write bufferhead into the fs */
static int ocfs2_modify_bh(struct inode *inode, struct buffer_head *bh,
void (*modify)(struct buffer_head *, void *), void *private)
{
struct super_block *sb = inode->i_sb;
handle_t *handle;
int status;
handle = ocfs2_start_trans(OCFS2_SB(sb), 1);
if (IS_ERR(handle)) {
status = PTR_ERR(handle);
mlog_errno(status);
return status;
}
status = ocfs2_journal_access(handle, inode, bh,
OCFS2_JOURNAL_ACCESS_WRITE);
if (status < 0) {
mlog_errno(status);
ocfs2_commit_trans(OCFS2_SB(sb), handle);
return status;
}
lock_buffer(bh);
modify(bh, private);
unlock_buffer(bh);
status = ocfs2_journal_dirty(handle, bh);
if (status < 0) {
mlog_errno(status);
ocfs2_commit_trans(OCFS2_SB(sb), handle);
return status;
}
status = ocfs2_commit_trans(OCFS2_SB(sb), handle);
if (status < 0) {
mlog_errno(status);
return status;
}
return 0;
}
/* Check whether we understand format of quota files */
static int ocfs2_local_check_quota_file(struct super_block *sb, int type)
{
unsigned int lmagics[MAXQUOTAS] = OCFS2_LOCAL_QMAGICS;
unsigned int lversions[MAXQUOTAS] = OCFS2_LOCAL_QVERSIONS;
unsigned int gmagics[MAXQUOTAS] = OCFS2_GLOBAL_QMAGICS;
unsigned int gversions[MAXQUOTAS] = OCFS2_GLOBAL_QVERSIONS;
unsigned int ino[MAXQUOTAS] = { USER_QUOTA_SYSTEM_INODE,
GROUP_QUOTA_SYSTEM_INODE };
struct buffer_head *bh;
struct inode *linode = sb_dqopt(sb)->files[type];
struct inode *ginode = NULL;
struct ocfs2_disk_dqheader *dqhead;
int status, ret = 0;
/* First check whether we understand local quota file */
bh = ocfs2_read_quota_block(linode, 0, &status);
if (!bh) {
mlog_errno(status);
mlog(ML_ERROR, "failed to read quota file header (type=%d)\n",
type);
goto out_err;
}
dqhead = (struct ocfs2_disk_dqheader *)(bh->b_data);
if (le32_to_cpu(dqhead->dqh_magic) != lmagics[type]) {
mlog(ML_ERROR, "quota file magic does not match (%u != %u),"
" type=%d\n", le32_to_cpu(dqhead->dqh_magic),
lmagics[type], type);
goto out_err;
}
if (le32_to_cpu(dqhead->dqh_version) != lversions[type]) {
mlog(ML_ERROR, "quota file version does not match (%u != %u),"
" type=%d\n", le32_to_cpu(dqhead->dqh_version),
lversions[type], type);
goto out_err;
}
brelse(bh);
bh = NULL;
/* Next check whether we understand global quota file */
ginode = ocfs2_get_system_file_inode(OCFS2_SB(sb), ino[type],
OCFS2_INVALID_SLOT);
if (!ginode) {
mlog(ML_ERROR, "cannot get global quota file inode "
"(type=%d)\n", type);
goto out_err;
}
/* Since the header is read only, we don't care about locking */
bh = ocfs2_read_quota_block(ginode, 0, &status);
if (!bh) {
mlog_errno(status);
mlog(ML_ERROR, "failed to read global quota file header "
"(type=%d)\n", type);
goto out_err;
}
dqhead = (struct ocfs2_disk_dqheader *)(bh->b_data);
if (le32_to_cpu(dqhead->dqh_magic) != gmagics[type]) {
mlog(ML_ERROR, "global quota file magic does not match "
"(%u != %u), type=%d\n",
le32_to_cpu(dqhead->dqh_magic), gmagics[type], type);
goto out_err;
}
if (le32_to_cpu(dqhead->dqh_version) != gversions[type]) {
mlog(ML_ERROR, "global quota file version does not match "
"(%u != %u), type=%d\n",
le32_to_cpu(dqhead->dqh_version), gversions[type],
type);
goto out_err;
}
ret = 1;
out_err:
brelse(bh);
iput(ginode);
return ret;
}
/* Release given list of quota file chunks */
static void ocfs2_release_local_quota_bitmaps(struct list_head *head)
{
struct ocfs2_quota_chunk *pos, *next;
list_for_each_entry_safe(pos, next, head, qc_chunk) {
list_del(&pos->qc_chunk);
brelse(pos->qc_headerbh);
kmem_cache_free(ocfs2_qf_chunk_cachep, pos);
}
}
/* Load quota bitmaps into memory */
static int ocfs2_load_local_quota_bitmaps(struct inode *inode,
struct ocfs2_local_disk_dqinfo *ldinfo,
struct list_head *head)
{
struct ocfs2_quota_chunk *newchunk;
int i, status;
INIT_LIST_HEAD(head);
for (i = 0; i < le32_to_cpu(ldinfo->dqi_chunks); i++) {
newchunk = kmem_cache_alloc(ocfs2_qf_chunk_cachep, GFP_NOFS);
if (!newchunk) {
ocfs2_release_local_quota_bitmaps(head);
return -ENOMEM;
}
newchunk->qc_num = i;
newchunk->qc_headerbh = ocfs2_read_quota_block(inode,
ol_quota_chunk_block(inode->i_sb, i),
&status);
if (!newchunk->qc_headerbh) {
mlog_errno(status);
kmem_cache_free(ocfs2_qf_chunk_cachep, newchunk);
ocfs2_release_local_quota_bitmaps(head);
return status;
}
list_add_tail(&newchunk->qc_chunk, head);
}
return 0;
}
static void olq_update_info(struct buffer_head *bh, void *private)
{
struct mem_dqinfo *info = private;
struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
struct ocfs2_local_disk_dqinfo *ldinfo;
ldinfo = (struct ocfs2_local_disk_dqinfo *)(bh->b_data +
OCFS2_LOCAL_INFO_OFF);
spin_lock(&dq_data_lock);
ldinfo->dqi_flags = cpu_to_le32(info->dqi_flags & DQF_MASK);
ldinfo->dqi_chunks = cpu_to_le32(oinfo->dqi_chunks);
ldinfo->dqi_blocks = cpu_to_le32(oinfo->dqi_blocks);
spin_unlock(&dq_data_lock);
}
/* Read information header from quota file */
static int ocfs2_local_read_info(struct super_block *sb, int type)
{
struct ocfs2_local_disk_dqinfo *ldinfo;
struct mem_dqinfo *info = sb_dqinfo(sb, type);
struct ocfs2_mem_dqinfo *oinfo;
struct inode *lqinode = sb_dqopt(sb)->files[type];
int status;
struct buffer_head *bh = NULL;
int locked = 0;
info->dqi_maxblimit = 0x7fffffffffffffffLL;
info->dqi_maxilimit = 0x7fffffffffffffffLL;
oinfo = kmalloc(sizeof(struct ocfs2_mem_dqinfo), GFP_NOFS);
if (!oinfo) {
mlog(ML_ERROR, "failed to allocate memory for ocfs2 quota"
" info.");
goto out_err;
}
info->dqi_priv = oinfo;
oinfo->dqi_type = type;
INIT_LIST_HEAD(&oinfo->dqi_chunk);
oinfo->dqi_lqi_bh = NULL;
oinfo->dqi_ibh = NULL;
status = ocfs2_global_read_info(sb, type);
if (status < 0)
goto out_err;
status = ocfs2_inode_lock(lqinode, &oinfo->dqi_lqi_bh, 1);
if (status < 0) {
mlog_errno(status);
goto out_err;
}
locked = 1;
/* Now read local header */
bh = ocfs2_read_quota_block(lqinode, 0, &status);
if (!bh) {
mlog_errno(status);
mlog(ML_ERROR, "failed to read quota file info header "
"(type=%d)\n", type);
goto out_err;
}
ldinfo = (struct ocfs2_local_disk_dqinfo *)(bh->b_data +
OCFS2_LOCAL_INFO_OFF);
info->dqi_flags = le32_to_cpu(ldinfo->dqi_flags);
oinfo->dqi_chunks = le32_to_cpu(ldinfo->dqi_chunks);
oinfo->dqi_blocks = le32_to_cpu(ldinfo->dqi_blocks);
oinfo->dqi_ibh = bh;
/* We crashed when using local quota file? */
if (!(info->dqi_flags & OLQF_CLEAN))
goto out_err; /* So far we just bail out. Later we should resync here */
status = ocfs2_load_local_quota_bitmaps(sb_dqopt(sb)->files[type],
ldinfo,
&oinfo->dqi_chunk);
if (status < 0) {
mlog_errno(status);
goto out_err;
}
/* Now mark quota file as used */
info->dqi_flags &= ~OLQF_CLEAN;
status = ocfs2_modify_bh(lqinode, bh, olq_update_info, info);
if (status < 0) {
mlog_errno(status);
goto out_err;
}
return 0;
out_err:
if (oinfo) {
iput(oinfo->dqi_gqinode);
ocfs2_simple_drop_lockres(OCFS2_SB(sb), &oinfo->dqi_gqlock);
ocfs2_lock_res_free(&oinfo->dqi_gqlock);
brelse(oinfo->dqi_lqi_bh);
if (locked)
ocfs2_inode_unlock(lqinode, 1);
ocfs2_release_local_quota_bitmaps(&oinfo->dqi_chunk);
kfree(oinfo);
}
brelse(bh);
return -1;
}
/* Write local info to quota file */
static int ocfs2_local_write_info(struct super_block *sb, int type)
{
struct mem_dqinfo *info = sb_dqinfo(sb, type);
struct buffer_head *bh = ((struct ocfs2_mem_dqinfo *)info->dqi_priv)
->dqi_ibh;
int status;
status = ocfs2_modify_bh(sb_dqopt(sb)->files[type], bh, olq_update_info,
info);
if (status < 0) {
mlog_errno(status);
return -1;
}
return 0;
}
/* Release info from memory */
static int ocfs2_local_free_info(struct super_block *sb, int type)
{
struct mem_dqinfo *info = sb_dqinfo(sb, type);
struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
struct ocfs2_quota_chunk *chunk;
struct ocfs2_local_disk_chunk *dchunk;
int mark_clean = 1, len;
int status;
iput(oinfo->dqi_gqinode);
ocfs2_simple_drop_lockres(OCFS2_SB(sb), &oinfo->dqi_gqlock);
ocfs2_lock_res_free(&oinfo->dqi_gqlock);
list_for_each_entry(chunk, &oinfo->dqi_chunk, qc_chunk) {
dchunk = (struct ocfs2_local_disk_chunk *)
(chunk->qc_headerbh->b_data);
if (chunk->qc_num < oinfo->dqi_chunks - 1) {
len = ol_chunk_entries(sb);
} else {
len = (oinfo->dqi_blocks -
ol_quota_chunk_block(sb, chunk->qc_num) - 1)
* ol_quota_entries_per_block(sb);
}
/* Not all entries free? Bug! */
if (le32_to_cpu(dchunk->dqc_free) != len) {
mlog(ML_ERROR, "releasing quota file with used "
"entries (type=%d)\n", type);
mark_clean = 0;
}
}
ocfs2_release_local_quota_bitmaps(&oinfo->dqi_chunk);
if (!mark_clean)
goto out;
/* Mark local file as clean */
info->dqi_flags |= OLQF_CLEAN;
status = ocfs2_modify_bh(sb_dqopt(sb)->files[type],
oinfo->dqi_ibh,
olq_update_info,
info);
if (status < 0) {
mlog_errno(status);
goto out;
}
out:
ocfs2_inode_unlock(sb_dqopt(sb)->files[type], 1);
brelse(oinfo->dqi_ibh);
brelse(oinfo->dqi_lqi_bh);
kfree(oinfo);
return 0;
}
static void olq_set_dquot(struct buffer_head *bh, void *private)
{
struct ocfs2_dquot *od = private;
struct ocfs2_local_disk_dqblk *dqblk;
struct super_block *sb = od->dq_dquot.dq_sb;
dqblk = (struct ocfs2_local_disk_dqblk *)(bh->b_data
+ ol_dqblk_block_offset(sb, od->dq_local_off));
dqblk->dqb_id = cpu_to_le64(od->dq_dquot.dq_id);
spin_lock(&dq_data_lock);
dqblk->dqb_spacemod = cpu_to_le64(od->dq_dquot.dq_dqb.dqb_curspace -
od->dq_origspace);
dqblk->dqb_inodemod = cpu_to_le64(od->dq_dquot.dq_dqb.dqb_curinodes -
od->dq_originodes);
spin_unlock(&dq_data_lock);
mlog(0, "Writing local dquot %u space %lld inodes %lld\n",
od->dq_dquot.dq_id, dqblk->dqb_spacemod, dqblk->dqb_inodemod);
}
/* Write dquot to local quota file */
static int ocfs2_local_write_dquot(struct dquot *dquot)
{
struct super_block *sb = dquot->dq_sb;
struct ocfs2_dquot *od = OCFS2_DQUOT(dquot);
struct buffer_head *bh;
int status;
bh = ocfs2_read_quota_block(sb_dqopt(sb)->files[dquot->dq_type],
ol_dqblk_file_block(sb, od->dq_local_off),
&status);
if (!bh) {
mlog_errno(status);
goto out;
}
status = ocfs2_modify_bh(sb_dqopt(sb)->files[dquot->dq_type], bh,
olq_set_dquot, od);
if (status < 0) {
mlog_errno(status);
goto out;
}
out:
brelse(bh);
return status;
}
/* Find free entry in local quota file */
static struct ocfs2_quota_chunk *ocfs2_find_free_entry(struct super_block *sb,
int type,
int *offset)
{
struct mem_dqinfo *info = sb_dqinfo(sb, type);
struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
struct ocfs2_quota_chunk *chunk;
struct ocfs2_local_disk_chunk *dchunk;
int found = 0, len;
list_for_each_entry(chunk, &oinfo->dqi_chunk, qc_chunk) {
dchunk = (struct ocfs2_local_disk_chunk *)
chunk->qc_headerbh->b_data;
if (le32_to_cpu(dchunk->dqc_free) > 0) {
found = 1;
break;
}
}
if (!found)
return NULL;
if (chunk->qc_num < oinfo->dqi_chunks - 1) {
len = ol_chunk_entries(sb);
} else {
len = (oinfo->dqi_blocks -
ol_quota_chunk_block(sb, chunk->qc_num) - 1)
* ol_quota_entries_per_block(sb);
}
found = ocfs2_find_next_zero_bit(dchunk->dqc_bitmap, len, 0);
/* We failed? */
if (found == len) {
mlog(ML_ERROR, "Did not find empty entry in chunk %d with %u"
" entries free (type=%d)\n", chunk->qc_num,
le32_to_cpu(dchunk->dqc_free), type);
return ERR_PTR(-EIO);
}
*offset = found;
return chunk;
}
/* Add new chunk to the local quota file */
static struct ocfs2_quota_chunk *ocfs2_local_quota_add_chunk(
struct super_block *sb,
int type,
int *offset)
{
struct mem_dqinfo *info = sb_dqinfo(sb, type);
struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
struct inode *lqinode = sb_dqopt(sb)->files[type];
struct ocfs2_quota_chunk *chunk = NULL;
struct ocfs2_local_disk_chunk *dchunk;
int status;
handle_t *handle;
struct buffer_head *bh = NULL;
u64 p_blkno;
/* We are protected by dqio_sem so no locking needed */
status = ocfs2_extend_no_holes(lqinode,
lqinode->i_size + 2 * sb->s_blocksize,
lqinode->i_size);
if (status < 0) {
mlog_errno(status);
goto out;
}
status = ocfs2_simple_size_update(lqinode, oinfo->dqi_lqi_bh,
lqinode->i_size + 2 * sb->s_blocksize);
if (status < 0) {
mlog_errno(status);
goto out;
}
chunk = kmem_cache_alloc(ocfs2_qf_chunk_cachep, GFP_NOFS);
if (!chunk) {
status = -ENOMEM;
mlog_errno(status);
goto out;
}
down_read(&OCFS2_I(lqinode)->ip_alloc_sem);
status = ocfs2_extent_map_get_blocks(lqinode, oinfo->dqi_blocks,
&p_blkno, NULL, NULL);
up_read(&OCFS2_I(lqinode)->ip_alloc_sem);
if (status < 0) {
mlog_errno(status);
goto out;
}
bh = sb_getblk(sb, p_blkno);
if (!bh) {
status = -ENOMEM;
mlog_errno(status);
goto out;
}
dchunk = (struct ocfs2_local_disk_chunk *)bh->b_data;
handle = ocfs2_start_trans(OCFS2_SB(sb), 2);
if (IS_ERR(handle)) {
status = PTR_ERR(handle);
mlog_errno(status);
goto out;
}
status = ocfs2_journal_access(handle, lqinode, bh,
OCFS2_JOURNAL_ACCESS_WRITE);
if (status < 0) {
mlog_errno(status);
goto out_trans;
}
lock_buffer(bh);
dchunk->dqc_free = ol_quota_entries_per_block(sb);
memset(dchunk->dqc_bitmap, 0,
sb->s_blocksize - sizeof(struct ocfs2_local_disk_chunk) -
OCFS2_QBLK_RESERVED_SPACE);
set_buffer_uptodate(bh);
unlock_buffer(bh);
status = ocfs2_journal_dirty(handle, bh);
if (status < 0) {
mlog_errno(status);
goto out_trans;
}
oinfo->dqi_blocks += 2;
oinfo->dqi_chunks++;
status = ocfs2_local_write_info(sb, type);
if (status < 0) {
mlog_errno(status);
goto out_trans;
}
status = ocfs2_commit_trans(OCFS2_SB(sb), handle);
if (status < 0) {
mlog_errno(status);
goto out;
}
list_add_tail(&chunk->qc_chunk, &oinfo->dqi_chunk);
chunk->qc_num = list_entry(chunk->qc_chunk.prev,
struct ocfs2_quota_chunk,
qc_chunk)->qc_num + 1;
chunk->qc_headerbh = bh;
*offset = 0;
return chunk;
out_trans:
ocfs2_commit_trans(OCFS2_SB(sb), handle);
out:
brelse(bh);
kmem_cache_free(ocfs2_qf_chunk_cachep, chunk);
return ERR_PTR(status);
}
/* Find free entry in local quota file */
static struct ocfs2_quota_chunk *ocfs2_extend_local_quota_file(
struct super_block *sb,
int type,
int *offset)
{
struct mem_dqinfo *info = sb_dqinfo(sb, type);
struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
struct ocfs2_quota_chunk *chunk;
struct inode *lqinode = sb_dqopt(sb)->files[type];
struct ocfs2_local_disk_chunk *dchunk;
int epb = ol_quota_entries_per_block(sb);
unsigned int chunk_blocks;
int status;
handle_t *handle;
if (list_empty(&oinfo->dqi_chunk))
return ocfs2_local_quota_add_chunk(sb, type, offset);
/* Is the last chunk full? */
chunk = list_entry(oinfo->dqi_chunk.prev,
struct ocfs2_quota_chunk, qc_chunk);
chunk_blocks = oinfo->dqi_blocks -
ol_quota_chunk_block(sb, chunk->qc_num) - 1;
if (ol_chunk_blocks(sb) == chunk_blocks)
return ocfs2_local_quota_add_chunk(sb, type, offset);
/* We are protected by dqio_sem so no locking needed */
status = ocfs2_extend_no_holes(lqinode,
lqinode->i_size + sb->s_blocksize,
lqinode->i_size);
if (status < 0) {
mlog_errno(status);
goto out;
}
status = ocfs2_simple_size_update(lqinode, oinfo->dqi_lqi_bh,
lqinode->i_size + sb->s_blocksize);
if (status < 0) {
mlog_errno(status);
goto out;
}
handle = ocfs2_start_trans(OCFS2_SB(sb), 2);
if (IS_ERR(handle)) {
status = PTR_ERR(handle);
mlog_errno(status);
goto out;
}
status = ocfs2_journal_access(handle, lqinode, chunk->qc_headerbh,
OCFS2_JOURNAL_ACCESS_WRITE);
if (status < 0) {
mlog_errno(status);
goto out_trans;
}
dchunk = (struct ocfs2_local_disk_chunk *)chunk->qc_headerbh->b_data;
lock_buffer(chunk->qc_headerbh);
le32_add_cpu(&dchunk->dqc_free, ol_quota_entries_per_block(sb));
unlock_buffer(chunk->qc_headerbh);
status = ocfs2_journal_dirty(handle, chunk->qc_headerbh);
if (status < 0) {
mlog_errno(status);
goto out_trans;
}
oinfo->dqi_blocks++;
status = ocfs2_local_write_info(sb, type);
if (status < 0) {
mlog_errno(status);
goto out_trans;
}
status = ocfs2_commit_trans(OCFS2_SB(sb), handle);
if (status < 0) {
mlog_errno(status);
goto out;
}
*offset = chunk_blocks * epb;
return chunk;
out_trans:
ocfs2_commit_trans(OCFS2_SB(sb), handle);
out:
return ERR_PTR(status);
}
void olq_alloc_dquot(struct buffer_head *bh, void *private)
{
int *offset = private;
struct ocfs2_local_disk_chunk *dchunk;
dchunk = (struct ocfs2_local_disk_chunk *)bh->b_data;
ocfs2_set_bit(*offset, dchunk->dqc_bitmap);
le32_add_cpu(&dchunk->dqc_free, -1);
}
/* Create dquot in the local file for given id */
static int ocfs2_create_local_dquot(struct dquot *dquot)
{
struct super_block *sb = dquot->dq_sb;
int type = dquot->dq_type;
struct inode *lqinode = sb_dqopt(sb)->files[type];
struct ocfs2_quota_chunk *chunk;
struct ocfs2_dquot *od = OCFS2_DQUOT(dquot);
int offset;
int status;
chunk = ocfs2_find_free_entry(sb, type, &offset);
if (!chunk) {
chunk = ocfs2_extend_local_quota_file(sb, type, &offset);
if (IS_ERR(chunk))
return PTR_ERR(chunk);
} else if (IS_ERR(chunk)) {
return PTR_ERR(chunk);
}
od->dq_local_off = ol_dqblk_off(sb, chunk->qc_num, offset);
od->dq_chunk = chunk;
/* Initialize dquot structure on disk */
status = ocfs2_local_write_dquot(dquot);
if (status < 0) {
mlog_errno(status);
goto out;
}
/* Mark structure as allocated */
status = ocfs2_modify_bh(lqinode, chunk->qc_headerbh, olq_alloc_dquot,
&offset);
if (status < 0) {
mlog_errno(status);
goto out;
}
out:
return status;
}
/* Create entry in local file for dquot, load data from the global file */
static int ocfs2_local_read_dquot(struct dquot *dquot)
{
int status;
mlog_entry("id=%u, type=%d\n", dquot->dq_id, dquot->dq_type);
status = ocfs2_global_read_dquot(dquot);
if (status < 0) {
mlog_errno(status);
goto out_err;
}
/* Now create entry in the local quota file */
status = ocfs2_create_local_dquot(dquot);
if (status < 0) {
mlog_errno(status);
goto out_err;
}
mlog_exit(0);
return 0;
out_err:
mlog_exit(status);
return status;
}
/* Release dquot structure from local quota file. ocfs2_release_dquot() has
* already started a transaction and obtained exclusive lock for global
* quota file. */
static int ocfs2_local_release_dquot(struct dquot *dquot)
{
int status;
int type = dquot->dq_type;
struct ocfs2_dquot *od = OCFS2_DQUOT(dquot);
struct super_block *sb = dquot->dq_sb;
struct ocfs2_local_disk_chunk *dchunk;
int offset;
handle_t *handle = journal_current_handle();
BUG_ON(!handle);
/* First write all local changes to global file */
status = ocfs2_global_release_dquot(dquot);
if (status < 0) {
mlog_errno(status);
goto out;
}
status = ocfs2_journal_access(handle, sb_dqopt(sb)->files[type],
od->dq_chunk->qc_headerbh, OCFS2_JOURNAL_ACCESS_WRITE);
if (status < 0) {
mlog_errno(status);
goto out;
}
offset = ol_dqblk_chunk_off(sb, od->dq_chunk->qc_num,
od->dq_local_off);
dchunk = (struct ocfs2_local_disk_chunk *)
(od->dq_chunk->qc_headerbh->b_data);
/* Mark structure as freed */
lock_buffer(od->dq_chunk->qc_headerbh);
ocfs2_clear_bit(offset, dchunk->dqc_bitmap);
le32_add_cpu(&dchunk->dqc_free, 1);
unlock_buffer(od->dq_chunk->qc_headerbh);
status = ocfs2_journal_dirty(handle, od->dq_chunk->qc_headerbh);
if (status < 0) {
mlog_errno(status);
goto out;
}
status = 0;
out:
/* Clear the read bit so that next time someone uses this
* dquot he reads fresh info from disk and allocates local
* dquot structure */
clear_bit(DQ_READ_B, &dquot->dq_flags);
return status;
}
static struct quota_format_ops ocfs2_format_ops = {
.check_quota_file = ocfs2_local_check_quota_file,
.read_file_info = ocfs2_local_read_info,
.write_file_info = ocfs2_global_write_info,
.free_file_info = ocfs2_local_free_info,
.read_dqblk = ocfs2_local_read_dquot,
.commit_dqblk = ocfs2_local_write_dquot,
.release_dqblk = ocfs2_local_release_dquot,
};
struct quota_format_type ocfs2_quota_format = {
.qf_fmt_id = QFMT_OCFS2,
.qf_ops = &ocfs2_format_ops,
.qf_owner = THIS_MODULE
};
