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linux/fs/ocfs2/quota_local.c
Jan Kara 15c34a7606 ocfs2: fix quota file corruption 
Global quota files are accessed from different nodes.  Thus we cannot
cache offset of quota structure in the quota file after we drop our node
reference count to it because after that moment quota structure may be
freed and reallocated elsewhere by a different node resulting in
corruption of quota file.

Fix the problem by clearing dq_off when we are releasing dquot structure.
We also remove the DB_READ_B handling because it is useless -
DQ_ACTIVE_B is set iff DQ_READ_B is set.

Signed-off-by: Jan Kara <jack@suse.cz>
Cc: Goldwyn Rodrigues <rgoldwyn@suse.de>
Cc: Joel Becker <jlbec@evilplan.org>
Reviewed-by: Mark Fasheh <mfasheh@suse.de>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2014-03-04 07:55:48 -08:00

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/*
* Implementation of operations over local quota file
*/
#include <linux/fs.h>
#include <linux/slab.h>
#include <linux/quota.h>
#include <linux/quotaops.h>
#include <linux/module.h>
#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"
#include "uptodate.h"
#include "super.h"
#include "ocfs2_trace.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;
}
static unsigned int ol_dqblk_block(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;
}
static unsigned int ol_dqblk_block_off(struct super_block *sb, int c, int off)
{
int epb = ol_quota_entries_per_block(sb);
return (off % epb) * sizeof(struct ocfs2_local_disk_dqblk);
}
/* Offset of the dquot structure in the quota file */
static loff_t ol_dqblk_off(struct super_block *sb, int c, int off)
{
return (ol_dqblk_block(sb, c, off) << sb->s_blocksize_bits) +
ol_dqblk_block_off(sb, c, off);
}
/* 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),
OCFS2_QUOTA_BLOCK_UPDATE_CREDITS);
if (IS_ERR(handle)) {
status = PTR_ERR(handle);
mlog_errno(status);
return status;
}
status = ocfs2_journal_access_dq(handle, INODE_CACHE(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);
ocfs2_journal_dirty(handle, bh);
status = ocfs2_commit_trans(OCFS2_SB(sb), handle);
if (status < 0) {
mlog_errno(status);
return status;
}
return 0;
}
/*
* Read quota block from a given logical offset.
*
* This function acquires ip_alloc_sem and thus it must not be called with a
* transaction started.
*/
static int ocfs2_read_quota_block(struct inode *inode, u64 v_block,
struct buffer_head **bh)
{
int rc = 0;
struct buffer_head *tmp = *bh;
if (i_size_read(inode) >> inode->i_sb->s_blocksize_bits <= v_block) {
ocfs2_error(inode->i_sb,
"Quota file %llu is probably corrupted! Requested "
"to read block %Lu but file has size only %Lu\n",
(unsigned long long)OCFS2_I(inode)->ip_blkno,
(unsigned long long)v_block,
(unsigned long long)i_size_read(inode));
return -EIO;
}
rc = ocfs2_read_virt_blocks(inode, v_block, 1, &tmp, 0,
ocfs2_validate_quota_block);
if (rc)
mlog_errno(rc);
/* If ocfs2_read_virt_blocks() got us a new bh, pass it up. */
if (!rc && !*bh)
*bh = tmp;
return rc;
}
/* 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 = NULL;
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 */
status = ocfs2_read_quota_block(linode, 0, &bh);
if (status) {
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 */
status = ocfs2_read_quota_block(ginode, 0, &bh);
if (status) {
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 = NULL;
status = ocfs2_read_quota_block(inode,
ol_quota_chunk_block(inode->i_sb, i),
&newchunk->qc_headerbh);
if (status) {
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);
}
static int ocfs2_add_recovery_chunk(struct super_block *sb,
struct ocfs2_local_disk_chunk *dchunk,
int chunk,
struct list_head *head)
{
struct ocfs2_recovery_chunk *rc;
rc = kmalloc(sizeof(struct ocfs2_recovery_chunk), GFP_NOFS);
if (!rc)
return -ENOMEM;
rc->rc_chunk = chunk;
rc->rc_bitmap = kmalloc(sb->s_blocksize, GFP_NOFS);
if (!rc->rc_bitmap) {
kfree(rc);
return -ENOMEM;
}
memcpy(rc->rc_bitmap, dchunk->dqc_bitmap,
(ol_chunk_entries(sb) + 7) >> 3);
list_add_tail(&rc->rc_list, head);
return 0;
}
static void free_recovery_list(struct list_head *head)
{
struct ocfs2_recovery_chunk *next;
struct ocfs2_recovery_chunk *rchunk;
list_for_each_entry_safe(rchunk, next, head, rc_list) {
list_del(&rchunk->rc_list);
kfree(rchunk->rc_bitmap);
kfree(rchunk);
}
}
void ocfs2_free_quota_recovery(struct ocfs2_quota_recovery *rec)
{
int type;
for (type = 0; type < MAXQUOTAS; type++)
free_recovery_list(&(rec->r_list[type]));
kfree(rec);
}
/* Load entries in our quota file we have to recover*/
static int ocfs2_recovery_load_quota(struct inode *lqinode,
struct ocfs2_local_disk_dqinfo *ldinfo,
int type,
struct list_head *head)
{
struct super_block *sb = lqinode->i_sb;
struct buffer_head *hbh;
struct ocfs2_local_disk_chunk *dchunk;
int i, chunks = le32_to_cpu(ldinfo->dqi_chunks);
int status = 0;
for (i = 0; i < chunks; i++) {
hbh = NULL;
status = ocfs2_read_quota_block(lqinode,
ol_quota_chunk_block(sb, i),
&hbh);
if (status) {
mlog_errno(status);
break;
}
dchunk = (struct ocfs2_local_disk_chunk *)hbh->b_data;
if (le32_to_cpu(dchunk->dqc_free) < ol_chunk_entries(sb))
status = ocfs2_add_recovery_chunk(sb, dchunk, i, head);
brelse(hbh);
if (status < 0)
break;
}
if (status < 0)
free_recovery_list(head);
return status;
}
static struct ocfs2_quota_recovery *ocfs2_alloc_quota_recovery(void)
{
int type;
struct ocfs2_quota_recovery *rec;
rec = kmalloc(sizeof(struct ocfs2_quota_recovery), GFP_NOFS);
if (!rec)
return NULL;
for (type = 0; type < MAXQUOTAS; type++)
INIT_LIST_HEAD(&(rec->r_list[type]));
return rec;
}
/* Load information we need for quota recovery into memory */
struct ocfs2_quota_recovery *ocfs2_begin_quota_recovery(
struct ocfs2_super *osb,
int slot_num)
{
unsigned int feature[MAXQUOTAS] = { OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
OCFS2_FEATURE_RO_COMPAT_GRPQUOTA};
unsigned int ino[MAXQUOTAS] = { LOCAL_USER_QUOTA_SYSTEM_INODE,
LOCAL_GROUP_QUOTA_SYSTEM_INODE };
struct super_block *sb = osb->sb;
struct ocfs2_local_disk_dqinfo *ldinfo;
struct inode *lqinode;
struct buffer_head *bh;
int type;
int status = 0;
struct ocfs2_quota_recovery *rec;
printk(KERN_NOTICE "ocfs2: Beginning quota recovery on device (%s) for "
"slot %u\n", osb->dev_str, slot_num);
rec = ocfs2_alloc_quota_recovery();
if (!rec)
return ERR_PTR(-ENOMEM);
/* First init... */
for (type = 0; type < MAXQUOTAS; type++) {
if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, feature[type]))
continue;
/* At this point, journal of the slot is already replayed so
* we can trust metadata and data of the quota file */
lqinode = ocfs2_get_system_file_inode(osb, ino[type], slot_num);
if (!lqinode) {
status = -ENOENT;
goto out;
}
status = ocfs2_inode_lock_full(lqinode, NULL, 1,
OCFS2_META_LOCK_RECOVERY);
if (status < 0) {
mlog_errno(status);
goto out_put;
}
/* Now read local header */
bh = NULL;
status = ocfs2_read_quota_block(lqinode, 0, &bh);
if (status) {
mlog_errno(status);
mlog(ML_ERROR, "failed to read quota file info header "
"(slot=%d type=%d)\n", slot_num, type);
goto out_lock;
}
ldinfo = (struct ocfs2_local_disk_dqinfo *)(bh->b_data +
OCFS2_LOCAL_INFO_OFF);
status = ocfs2_recovery_load_quota(lqinode, ldinfo, type,
&rec->r_list[type]);
brelse(bh);
out_lock:
ocfs2_inode_unlock(lqinode, 1);
out_put:
iput(lqinode);
if (status < 0)
break;
}
out:
if (status < 0) {
ocfs2_free_quota_recovery(rec);
rec = ERR_PTR(status);
}
return rec;
}
/* Sync changes in local quota file into global quota file and
* reinitialize local quota file.
* The function expects local quota file to be already locked and
* dqonoff_mutex locked. */
static int ocfs2_recover_local_quota_file(struct inode *lqinode,
int type,
struct ocfs2_quota_recovery *rec)
{
struct super_block *sb = lqinode->i_sb;
struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
struct ocfs2_local_disk_chunk *dchunk;
struct ocfs2_local_disk_dqblk *dqblk;
struct dquot *dquot;
handle_t *handle;
struct buffer_head *hbh = NULL, *qbh = NULL;
int status = 0;
int bit, chunk;
struct ocfs2_recovery_chunk *rchunk, *next;
qsize_t spacechange, inodechange;
trace_ocfs2_recover_local_quota_file((unsigned long)lqinode->i_ino, type);
list_for_each_entry_safe(rchunk, next, &(rec->r_list[type]), rc_list) {
chunk = rchunk->rc_chunk;
hbh = NULL;
status = ocfs2_read_quota_block(lqinode,
ol_quota_chunk_block(sb, chunk),
&hbh);
if (status) {
mlog_errno(status);
break;
}
dchunk = (struct ocfs2_local_disk_chunk *)hbh->b_data;
for_each_set_bit(bit, rchunk->rc_bitmap, ol_chunk_entries(sb)) {
qbh = NULL;
status = ocfs2_read_quota_block(lqinode,
ol_dqblk_block(sb, chunk, bit),
&qbh);
if (status) {
mlog_errno(status);
break;
}
dqblk = (struct ocfs2_local_disk_dqblk *)(qbh->b_data +
ol_dqblk_block_off(sb, chunk, bit));
dquot = dqget(sb,
make_kqid(&init_user_ns, type,
le64_to_cpu(dqblk->dqb_id)));
if (!dquot) {
status = -EIO;
mlog(ML_ERROR, "Failed to get quota structure "
"for id %u, type %d. Cannot finish quota "
"file recovery.\n",
(unsigned)le64_to_cpu(dqblk->dqb_id),
type);
goto out_put_bh;
}
status = ocfs2_lock_global_qf(oinfo, 1);
if (status < 0) {
mlog_errno(status);
goto out_put_dquot;
}
handle = ocfs2_start_trans(OCFS2_SB(sb),
OCFS2_QSYNC_CREDITS);
if (IS_ERR(handle)) {
status = PTR_ERR(handle);
mlog_errno(status);
goto out_drop_lock;
}
mutex_lock(&sb_dqopt(sb)->dqio_mutex);
spin_lock(&dq_data_lock);
/* Add usage from quota entry into quota changes
* of our node. Auxiliary variables are important
* due to signedness */
spacechange = le64_to_cpu(dqblk->dqb_spacemod);
inodechange = le64_to_cpu(dqblk->dqb_inodemod);
dquot->dq_dqb.dqb_curspace += spacechange;
dquot->dq_dqb.dqb_curinodes += inodechange;
spin_unlock(&dq_data_lock);
/* We want to drop reference held by the crashed
* node. Since we have our own reference we know
* global structure actually won't be freed. */
status = ocfs2_global_release_dquot(dquot);
if (status < 0) {
mlog_errno(status);
goto out_commit;
}
/* Release local quota file entry */
status = ocfs2_journal_access_dq(handle,
INODE_CACHE(lqinode),
qbh, OCFS2_JOURNAL_ACCESS_WRITE);
if (status < 0) {
mlog_errno(status);
goto out_commit;
}
lock_buffer(qbh);
WARN_ON(!ocfs2_test_bit_unaligned(bit, dchunk->dqc_bitmap));
ocfs2_clear_bit_unaligned(bit, dchunk->dqc_bitmap);
le32_add_cpu(&dchunk->dqc_free, 1);
unlock_buffer(qbh);
ocfs2_journal_dirty(handle, qbh);
out_commit:
mutex_unlock(&sb_dqopt(sb)->dqio_mutex);
ocfs2_commit_trans(OCFS2_SB(sb), handle);
out_drop_lock:
ocfs2_unlock_global_qf(oinfo, 1);
out_put_dquot:
dqput(dquot);
out_put_bh:
brelse(qbh);
if (status < 0)
break;
}
brelse(hbh);
list_del(&rchunk->rc_list);
kfree(rchunk->rc_bitmap);
kfree(rchunk);
if (status < 0)
break;
}
if (status < 0)
free_recovery_list(&(rec->r_list[type]));
if (status)
mlog_errno(status);
return status;
}
/* Recover local quota files for given node different from us */
int ocfs2_finish_quota_recovery(struct ocfs2_super *osb,
struct ocfs2_quota_recovery *rec,
int slot_num)
{
unsigned int ino[MAXQUOTAS] = { LOCAL_USER_QUOTA_SYSTEM_INODE,
LOCAL_GROUP_QUOTA_SYSTEM_INODE };
struct super_block *sb = osb->sb;
struct ocfs2_local_disk_dqinfo *ldinfo;
struct buffer_head *bh;
handle_t *handle;
int type;
int status = 0;
struct inode *lqinode;
unsigned int flags;
printk(KERN_NOTICE "ocfs2: Finishing quota recovery on device (%s) for "
"slot %u\n", osb->dev_str, slot_num);
mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
for (type = 0; type < MAXQUOTAS; type++) {
if (list_empty(&(rec->r_list[type])))
continue;
trace_ocfs2_finish_quota_recovery(slot_num);
lqinode = ocfs2_get_system_file_inode(osb, ino[type], slot_num);
if (!lqinode) {
status = -ENOENT;
goto out;
}
status = ocfs2_inode_lock_full(lqinode, NULL, 1,
OCFS2_META_LOCK_NOQUEUE);
/* Someone else is holding the lock? Then he must be
* doing the recovery. Just skip the file... */
if (status == -EAGAIN) {
printk(KERN_NOTICE "ocfs2: Skipping quota recovery on "
"device (%s) for slot %d because quota file is "
"locked.\n", osb->dev_str, slot_num);
status = 0;
goto out_put;
} else if (status < 0) {
mlog_errno(status);
goto out_put;
}
/* Now read local header */
bh = NULL;
status = ocfs2_read_quota_block(lqinode, 0, &bh);
if (status) {
mlog_errno(status);
mlog(ML_ERROR, "failed to read quota file info header "
"(slot=%d type=%d)\n", slot_num, type);
goto out_lock;
}
ldinfo = (struct ocfs2_local_disk_dqinfo *)(bh->b_data +
OCFS2_LOCAL_INFO_OFF);
/* Is recovery still needed? */
flags = le32_to_cpu(ldinfo->dqi_flags);
if (!(flags & OLQF_CLEAN))
status = ocfs2_recover_local_quota_file(lqinode,
type,
rec);
/* We don't want to mark file as clean when it is actually
* active */
if (slot_num == osb->slot_num)
goto out_bh;
/* Mark quota file as clean if we are recovering quota file of
* some other node. */
handle = ocfs2_start_trans(osb,
OCFS2_LOCAL_QINFO_WRITE_CREDITS);
if (IS_ERR(handle)) {
status = PTR_ERR(handle);
mlog_errno(status);
goto out_bh;
}
status = ocfs2_journal_access_dq(handle, INODE_CACHE(lqinode),
bh,
OCFS2_JOURNAL_ACCESS_WRITE);
if (status < 0) {
mlog_errno(status);
goto out_trans;
}
lock_buffer(bh);
ldinfo->dqi_flags = cpu_to_le32(flags | OLQF_CLEAN);
unlock_buffer(bh);
ocfs2_journal_dirty(handle, bh);
out_trans:
ocfs2_commit_trans(osb, handle);
out_bh:
brelse(bh);
out_lock:
ocfs2_inode_unlock(lqinode, 1);
out_put:
iput(lqinode);
if (status < 0)
break;
}
out:
mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
kfree(rec);
return status;
}
/* 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;
struct ocfs2_quota_recovery *rec;
int locked = 0;
/* We don't need the lock and we have to acquire quota file locks
* which will later depend on this lock */
mutex_unlock(&sb_dqopt(sb)->dqio_mutex);
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_rec = NULL;
oinfo->dqi_lqi_bh = NULL;
oinfo->dqi_libh = 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 */
status = ocfs2_read_quota_block(lqinode, 0, &bh);
if (status) {
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_libh = bh;
/* We crashed when using local quota file? */
if (!(info->dqi_flags & OLQF_CLEAN)) {
rec = OCFS2_SB(sb)->quota_rec;
if (!rec) {
rec = ocfs2_alloc_quota_recovery();
if (!rec) {
status = -ENOMEM;
mlog_errno(status);
goto out_err;
}
OCFS2_SB(sb)->quota_rec = rec;
}
status = ocfs2_recovery_load_quota(lqinode, ldinfo, type,
&rec->r_list[type]);
if (status < 0) {
mlog_errno(status);
goto out_err;
}
}
status = ocfs2_load_local_quota_bitmaps(lqinode,
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;
}
mutex_lock(&sb_dqopt(sb)->dqio_mutex);
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);
mutex_lock(&sb_dqopt(sb)->dqio_mutex);
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_libh;
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);
/* dqonoff_mutex protects us against racing with recovery thread... */
if (oinfo->dqi_rec) {
ocfs2_free_quota_recovery(oinfo->dqi_rec);
mark_clean = 0;
}
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_libh,
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_libh);
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(from_kqid(&init_user_ns,
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);
trace_olq_set_dquot(
(unsigned long long)le64_to_cpu(dqblk->dqb_spacemod),
(unsigned long long)le64_to_cpu(dqblk->dqb_inodemod),
from_kqid(&init_user_ns, od->dq_dquot.dq_id));
}
/* Write dquot to local quota file */
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;
struct inode *lqinode = sb_dqopt(sb)->files[dquot->dq_id.type];
int status;
status = ocfs2_read_quota_phys_block(lqinode, od->dq_local_phys_blk,
&bh);
if (status) {
mlog_errno(status);
goto out;
}
status = ocfs2_modify_bh(lqinode, 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_unaligned(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, *dbh = NULL;
u64 p_blkno;
/* We are protected by dqio_sem so no locking needed */
status = ocfs2_extend_no_holes(lqinode, NULL,
i_size_read(lqinode) + 2 * sb->s_blocksize,
i_size_read(lqinode));
if (status < 0) {
mlog_errno(status);
goto out;
}
status = ocfs2_simple_size_update(lqinode, oinfo->dqi_lqi_bh,
i_size_read(lqinode) + 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;
}
/* Local quota info and two new blocks we initialize */
handle = ocfs2_start_trans(OCFS2_SB(sb),
OCFS2_LOCAL_QINFO_WRITE_CREDITS +
2 * OCFS2_QUOTA_BLOCK_UPDATE_CREDITS);
if (IS_ERR(handle)) {
status = PTR_ERR(handle);
mlog_errno(status);
goto out;
}
/* Initialize chunk header */
status = ocfs2_extent_map_get_blocks(lqinode, oinfo->dqi_blocks,
&p_blkno, NULL, NULL);
if (status < 0) {
mlog_errno(status);
goto out_trans;
}
bh = sb_getblk(sb, p_blkno);
if (!bh) {
status = -ENOMEM;
mlog_errno(status);
goto out_trans;
}
dchunk = (struct ocfs2_local_disk_chunk *)bh->b_data;
ocfs2_set_new_buffer_uptodate(INODE_CACHE(lqinode), bh);
status = ocfs2_journal_access_dq(handle, INODE_CACHE(lqinode), bh,
OCFS2_JOURNAL_ACCESS_CREATE);
if (status < 0) {
mlog_errno(status);
goto out_trans;
}
lock_buffer(bh);
dchunk->dqc_free = cpu_to_le32(ol_quota_entries_per_block(sb));
memset(dchunk->dqc_bitmap, 0,
sb->s_blocksize - sizeof(struct ocfs2_local_disk_chunk) -
OCFS2_QBLK_RESERVED_SPACE);
unlock_buffer(bh);
ocfs2_journal_dirty(handle, bh);
/* Initialize new block with structures */
status = ocfs2_extent_map_get_blocks(lqinode, oinfo->dqi_blocks + 1,
&p_blkno, NULL, NULL);
if (status < 0) {
mlog_errno(status);
goto out_trans;
}
dbh = sb_getblk(sb, p_blkno);
if (!dbh) {
status = -ENOMEM;
mlog_errno(status);
goto out_trans;
}
ocfs2_set_new_buffer_uptodate(INODE_CACHE(lqinode), dbh);
status = ocfs2_journal_access_dq(handle, INODE_CACHE(lqinode), dbh,
OCFS2_JOURNAL_ACCESS_CREATE);
if (status < 0) {
mlog_errno(status);
goto out_trans;
}
lock_buffer(dbh);
memset(dbh->b_data, 0, sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE);
unlock_buffer(dbh);
ocfs2_journal_dirty(handle, dbh);
/* Update local quotafile info */
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);
brelse(dbh);
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;
struct buffer_head *bh;
u64 p_blkno;
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, NULL,
i_size_read(lqinode) + sb->s_blocksize,
i_size_read(lqinode));
if (status < 0) {
mlog_errno(status);
goto out;
}
status = ocfs2_simple_size_update(lqinode, oinfo->dqi_lqi_bh,
i_size_read(lqinode) + sb->s_blocksize);
if (status < 0) {
mlog_errno(status);
goto out;
}
/* Get buffer from the just added block */
status = ocfs2_extent_map_get_blocks(lqinode, oinfo->dqi_blocks,
&p_blkno, NULL, NULL);
if (status < 0) {
mlog_errno(status);
goto out;
}
bh = sb_getblk(sb, p_blkno);
if (!bh) {
status = -ENOMEM;
mlog_errno(status);
goto out;
}
ocfs2_set_new_buffer_uptodate(INODE_CACHE(lqinode), bh);
/* Local quota info, chunk header and the new block we initialize */
handle = ocfs2_start_trans(OCFS2_SB(sb),
OCFS2_LOCAL_QINFO_WRITE_CREDITS +
2 * OCFS2_QUOTA_BLOCK_UPDATE_CREDITS);
if (IS_ERR(handle)) {
status = PTR_ERR(handle);
mlog_errno(status);
goto out;
}
/* Zero created block */
status = ocfs2_journal_access_dq(handle, INODE_CACHE(lqinode), bh,
OCFS2_JOURNAL_ACCESS_CREATE);
if (status < 0) {
mlog_errno(status);
goto out_trans;
}
lock_buffer(bh);
memset(bh->b_data, 0, sb->s_blocksize);
unlock_buffer(bh);
ocfs2_journal_dirty(handle, bh);
/* Update chunk header */
status = ocfs2_journal_access_dq(handle, INODE_CACHE(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);
ocfs2_journal_dirty(handle, chunk->qc_headerbh);
/* Update file header */
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);
}
static 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_unaligned(*offset, dchunk->dqc_bitmap);
le32_add_cpu(&dchunk->dqc_free, -1);
}
/* Create dquot in the local file for given id */
int ocfs2_create_local_dquot(struct dquot *dquot)
{
struct super_block *sb = dquot->dq_sb;
int type = dquot->dq_id.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;
u64 pcount;
down_write(&OCFS2_I(lqinode)->ip_alloc_sem);
chunk = ocfs2_find_free_entry(sb, type, &offset);
if (!chunk) {
chunk = ocfs2_extend_local_quota_file(sb, type, &offset);
if (IS_ERR(chunk)) {
status = PTR_ERR(chunk);
goto out;
}
} else if (IS_ERR(chunk)) {
status = PTR_ERR(chunk);
goto out;
}
od->dq_local_off = ol_dqblk_off(sb, chunk->qc_num, offset);
od->dq_chunk = chunk;
status = ocfs2_extent_map_get_blocks(lqinode,
ol_dqblk_block(sb, chunk->qc_num, offset),
&od->dq_local_phys_blk,
&pcount,
NULL);
/* 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:
up_write(&OCFS2_I(lqinode)->ip_alloc_sem);
return status;
}
/*
* Release dquot structure from local quota file. ocfs2_release_dquot() has
* already started a transaction and written all changes to global quota file
*/
int ocfs2_local_release_dquot(handle_t *handle, struct dquot *dquot)
{
int status;
int type = dquot->dq_id.type;
struct ocfs2_dquot *od = OCFS2_DQUOT(dquot);
struct super_block *sb = dquot->dq_sb;
struct ocfs2_local_disk_chunk *dchunk;
int offset;
status = ocfs2_journal_access_dq(handle,
INODE_CACHE(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_unaligned(offset, dchunk->dqc_bitmap);
le32_add_cpu(&dchunk->dqc_free, 1);
unlock_buffer(od->dq_chunk->qc_headerbh);
ocfs2_journal_dirty(handle, od->dq_chunk->qc_headerbh);
out:
return status;
}
static const 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,
};
struct quota_format_type ocfs2_quota_format = {
.qf_fmt_id = QFMT_OCFS2,
.qf_ops = &ocfs2_format_ops,
.qf_owner = THIS_MODULE
};
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