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linux/fs/ocfs2/quota_global.c
Joel Becker 13723d00e3 ocfs2: Use metadata-specific ocfs2_journal_access_*() functions. 
The per-metadata-type ocfs2_journal_access_*() functions hook up jbd2
commit triggers and allow us to compute metadata ecc right before the
buffers are written out.  This commit provides ecc for inodes, extent
blocks, group descriptors, and quota blocks.  It is not safe to use
extened attributes and metaecc at the same time yet.

The ocfs2_extent_tree and ocfs2_path abstractions in alloc.c both hide
the type of block at their root.  Before, it didn't matter, but now the
root block must use the appropriate ocfs2_journal_access_*() function.
To keep this abstract, the structures now have a pointer to the matching
journal_access function and a wrapper call to call it.

A few places use naked ocfs2_write_block() calls instead of adding the
blocks to the journal.  We make sure to calculate their checksum and ecc
before the write.

Since we pass around the journal_access functions.  Let's typedef them
in ocfs2.h.

Signed-off-by: Joel Becker <joel.becker@oracle.com>
Signed-off-by: Mark Fasheh <mfasheh@suse.com>
2009-01-05 08:40:32 -08:00

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/*
* Implementation of operations over global quota file
*/
#include <linux/spinlock.h>
#include <linux/fs.h>
#include <linux/quota.h>
#include <linux/quotaops.h>
#include <linux/dqblk_qtree.h>
#include <linux/jiffies.h>
#include <linux/writeback.h>
#include <linux/workqueue.h>
#define MLOG_MASK_PREFIX ML_QUOTA
#include <cluster/masklog.h>
#include "ocfs2_fs.h"
#include "ocfs2.h"
#include "alloc.h"
#include "blockcheck.h"
#include "inode.h"
#include "journal.h"
#include "file.h"
#include "sysfile.h"
#include "dlmglue.h"
#include "uptodate.h"
#include "quota.h"
static struct workqueue_struct *ocfs2_quota_wq = NULL;
static void qsync_work_fn(struct work_struct *work);
static void ocfs2_global_disk2memdqb(struct dquot *dquot, void *dp)
{
struct ocfs2_global_disk_dqblk *d = dp;
struct mem_dqblk *m = &dquot->dq_dqb;
/* Update from disk only entries not set by the admin */
if (!test_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags)) {
m->dqb_ihardlimit = le64_to_cpu(d->dqb_ihardlimit);
m->dqb_isoftlimit = le64_to_cpu(d->dqb_isoftlimit);
}
if (!test_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags))
m->dqb_curinodes = le64_to_cpu(d->dqb_curinodes);
if (!test_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags)) {
m->dqb_bhardlimit = le64_to_cpu(d->dqb_bhardlimit);
m->dqb_bsoftlimit = le64_to_cpu(d->dqb_bsoftlimit);
}
if (!test_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags))
m->dqb_curspace = le64_to_cpu(d->dqb_curspace);
if (!test_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags))
m->dqb_btime = le64_to_cpu(d->dqb_btime);
if (!test_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags))
m->dqb_itime = le64_to_cpu(d->dqb_itime);
OCFS2_DQUOT(dquot)->dq_use_count = le32_to_cpu(d->dqb_use_count);
}
static void ocfs2_global_mem2diskdqb(void *dp, struct dquot *dquot)
{
struct ocfs2_global_disk_dqblk *d = dp;
struct mem_dqblk *m = &dquot->dq_dqb;
d->dqb_id = cpu_to_le32(dquot->dq_id);
d->dqb_use_count = cpu_to_le32(OCFS2_DQUOT(dquot)->dq_use_count);
d->dqb_ihardlimit = cpu_to_le64(m->dqb_ihardlimit);
d->dqb_isoftlimit = cpu_to_le64(m->dqb_isoftlimit);
d->dqb_curinodes = cpu_to_le64(m->dqb_curinodes);
d->dqb_bhardlimit = cpu_to_le64(m->dqb_bhardlimit);
d->dqb_bsoftlimit = cpu_to_le64(m->dqb_bsoftlimit);
d->dqb_curspace = cpu_to_le64(m->dqb_curspace);
d->dqb_btime = cpu_to_le64(m->dqb_btime);
d->dqb_itime = cpu_to_le64(m->dqb_itime);
}
static int ocfs2_global_is_id(void *dp, struct dquot *dquot)
{
struct ocfs2_global_disk_dqblk *d = dp;
struct ocfs2_mem_dqinfo *oinfo =
sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv;
if (qtree_entry_unused(&oinfo->dqi_gi, dp))
return 0;
return le32_to_cpu(d->dqb_id) == dquot->dq_id;
}
struct qtree_fmt_operations ocfs2_global_ops = {
.mem2disk_dqblk = ocfs2_global_mem2diskdqb,
.disk2mem_dqblk = ocfs2_global_disk2memdqb,
.is_id = ocfs2_global_is_id,
};
static int ocfs2_validate_quota_block(struct super_block *sb,
struct buffer_head *bh)
{
struct ocfs2_disk_dqtrailer *dqt =
ocfs2_block_dqtrailer(sb->s_blocksize, bh->b_data);
mlog(0, "Validating quota block %llu\n",
(unsigned long long)bh->b_blocknr);
BUG_ON(!buffer_uptodate(bh));
/*
* If the ecc fails, we return the error but otherwise
* leave the filesystem running. We know any error is
* local to this block.
*/
return ocfs2_validate_meta_ecc(sb, bh->b_data, &dqt->dq_check);
}
int ocfs2_read_quota_block(struct inode *inode, u64 v_block,
struct buffer_head **bh)
{
int rc = 0;
struct buffer_head *tmp = *bh;
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;
}
static int ocfs2_get_quota_block(struct inode *inode, int block,
struct buffer_head **bh)
{
u64 pblock, pcount;
int err;
down_read(&OCFS2_I(inode)->ip_alloc_sem);
err = ocfs2_extent_map_get_blocks(inode, block, &pblock, &pcount, NULL);
up_read(&OCFS2_I(inode)->ip_alloc_sem);
if (err) {
mlog_errno(err);
return err;
}
*bh = sb_getblk(inode->i_sb, pblock);
if (!*bh) {
err = -EIO;
mlog_errno(err);
}
return err;;
}
/* Read data from global quotafile - avoid pagecache and such because we cannot
* afford acquiring the locks... We use quota cluster lock to serialize
* operations. Caller is responsible for acquiring it. */
ssize_t ocfs2_quota_read(struct super_block *sb, int type, char *data,
size_t len, loff_t off)
{
struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
struct inode *gqinode = oinfo->dqi_gqinode;
loff_t i_size = i_size_read(gqinode);
int offset = off & (sb->s_blocksize - 1);
sector_t blk = off >> sb->s_blocksize_bits;
int err = 0;
struct buffer_head *bh;
size_t toread, tocopy;
if (off > i_size)
return 0;
if (off + len > i_size)
len = i_size - off;
toread = len;
while (toread > 0) {
tocopy = min((size_t)(sb->s_blocksize - offset), toread);
bh = NULL;
err = ocfs2_read_quota_block(gqinode, blk, &bh);
if (err) {
mlog_errno(err);
return err;
}
memcpy(data, bh->b_data + offset, tocopy);
brelse(bh);
offset = 0;
toread -= tocopy;
data += tocopy;
blk++;
}
return len;
}
/* Write to quotafile (we know the transaction is already started and has
* enough credits) */
ssize_t ocfs2_quota_write(struct super_block *sb, int type,
const char *data, size_t len, loff_t off)
{
struct mem_dqinfo *info = sb_dqinfo(sb, type);
struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
struct inode *gqinode = oinfo->dqi_gqinode;
int offset = off & (sb->s_blocksize - 1);
sector_t blk = off >> sb->s_blocksize_bits;
int err = 0, new = 0, ja_type;
struct buffer_head *bh = NULL;
handle_t *handle = journal_current_handle();
if (!handle) {
mlog(ML_ERROR, "Quota write (off=%llu, len=%llu) cancelled "
"because transaction was not started.\n",
(unsigned long long)off, (unsigned long long)len);
return -EIO;
}
if (len > sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE - offset) {
WARN_ON(1);
len = sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE - offset;
}
mutex_lock_nested(&gqinode->i_mutex, I_MUTEX_QUOTA);
if (gqinode->i_size < off + len) {
down_write(&OCFS2_I(gqinode)->ip_alloc_sem);
err = ocfs2_extend_no_holes(gqinode, off + len, off);
up_write(&OCFS2_I(gqinode)->ip_alloc_sem);
if (err < 0)
goto out;
err = ocfs2_simple_size_update(gqinode,
oinfo->dqi_gqi_bh,
off + len);
if (err < 0)
goto out;
new = 1;
}
/* Not rewriting whole block? */
if ((offset || len < sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE) &&
!new) {
err = ocfs2_read_quota_block(gqinode, blk, &bh);
ja_type = OCFS2_JOURNAL_ACCESS_WRITE;
} else {
err = ocfs2_get_quota_block(gqinode, blk, &bh);
ja_type = OCFS2_JOURNAL_ACCESS_CREATE;
}
if (err) {
mlog_errno(err);
return err;
}
lock_buffer(bh);
if (new)
memset(bh->b_data, 0, sb->s_blocksize);
memcpy(bh->b_data + offset, data, len);
flush_dcache_page(bh->b_page);
set_buffer_uptodate(bh);
unlock_buffer(bh);
ocfs2_set_buffer_uptodate(gqinode, bh);
err = ocfs2_journal_access_dq(handle, gqinode, bh, ja_type);
if (err < 0) {
brelse(bh);
goto out;
}
err = ocfs2_journal_dirty(handle, bh);
brelse(bh);
if (err < 0)
goto out;
out:
if (err) {
mutex_unlock(&gqinode->i_mutex);
mlog_errno(err);
return err;
}
gqinode->i_version++;
ocfs2_mark_inode_dirty(handle, gqinode, oinfo->dqi_gqi_bh);
mutex_unlock(&gqinode->i_mutex);
return len;
}
int ocfs2_lock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex)
{
int status;
struct buffer_head *bh = NULL;
status = ocfs2_inode_lock(oinfo->dqi_gqinode, &bh, ex);
if (status < 0)
return status;
spin_lock(&dq_data_lock);
if (!oinfo->dqi_gqi_count++)
oinfo->dqi_gqi_bh = bh;
else
WARN_ON(bh != oinfo->dqi_gqi_bh);
spin_unlock(&dq_data_lock);
return 0;
}
void ocfs2_unlock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex)
{
ocfs2_inode_unlock(oinfo->dqi_gqinode, ex);
brelse(oinfo->dqi_gqi_bh);
spin_lock(&dq_data_lock);
if (!--oinfo->dqi_gqi_count)
oinfo->dqi_gqi_bh = NULL;
spin_unlock(&dq_data_lock);
}
/* Read information header from global quota file */
int ocfs2_global_read_info(struct super_block *sb, int type)
{
struct inode *gqinode = NULL;
unsigned int ino[MAXQUOTAS] = { USER_QUOTA_SYSTEM_INODE,
GROUP_QUOTA_SYSTEM_INODE };
struct ocfs2_global_disk_dqinfo dinfo;
struct mem_dqinfo *info = sb_dqinfo(sb, type);
struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
int status;
mlog_entry_void();
/* Read global header */
gqinode = ocfs2_get_system_file_inode(OCFS2_SB(sb), ino[type],
OCFS2_INVALID_SLOT);
if (!gqinode) {
mlog(ML_ERROR, "failed to get global quota inode (type=%d)\n",
type);
status = -EINVAL;
goto out_err;
}
oinfo->dqi_gi.dqi_sb = sb;
oinfo->dqi_gi.dqi_type = type;
ocfs2_qinfo_lock_res_init(&oinfo->dqi_gqlock, oinfo);
oinfo->dqi_gi.dqi_entry_size = sizeof(struct ocfs2_global_disk_dqblk);
oinfo->dqi_gi.dqi_ops = &ocfs2_global_ops;
oinfo->dqi_gqi_bh = NULL;
oinfo->dqi_gqi_count = 0;
oinfo->dqi_gqinode = gqinode;
status = ocfs2_lock_global_qf(oinfo, 0);
if (status < 0) {
mlog_errno(status);
goto out_err;
}
status = sb->s_op->quota_read(sb, type, (char *)&dinfo,
sizeof(struct ocfs2_global_disk_dqinfo),
OCFS2_GLOBAL_INFO_OFF);
ocfs2_unlock_global_qf(oinfo, 0);
if (status != sizeof(struct ocfs2_global_disk_dqinfo)) {
mlog(ML_ERROR, "Cannot read global quota info (%d).\n",
status);
if (status >= 0)
status = -EIO;
mlog_errno(status);
goto out_err;
}
info->dqi_bgrace = le32_to_cpu(dinfo.dqi_bgrace);
info->dqi_igrace = le32_to_cpu(dinfo.dqi_igrace);
oinfo->dqi_syncms = le32_to_cpu(dinfo.dqi_syncms);
oinfo->dqi_syncjiff = msecs_to_jiffies(oinfo->dqi_syncms);
oinfo->dqi_gi.dqi_blocks = le32_to_cpu(dinfo.dqi_blocks);
oinfo->dqi_gi.dqi_free_blk = le32_to_cpu(dinfo.dqi_free_blk);
oinfo->dqi_gi.dqi_free_entry = le32_to_cpu(dinfo.dqi_free_entry);
oinfo->dqi_gi.dqi_blocksize_bits = sb->s_blocksize_bits;
oinfo->dqi_gi.dqi_usable_bs = sb->s_blocksize -
OCFS2_QBLK_RESERVED_SPACE;
oinfo->dqi_gi.dqi_qtree_depth = qtree_depth(&oinfo->dqi_gi);
INIT_DELAYED_WORK(&oinfo->dqi_sync_work, qsync_work_fn);
queue_delayed_work(ocfs2_quota_wq, &oinfo->dqi_sync_work,
oinfo->dqi_syncjiff);
out_err:
mlog_exit(status);
return status;
}
/* Write information to global quota file. Expects exlusive lock on quota
* file inode and quota info */
static int __ocfs2_global_write_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_global_disk_dqinfo dinfo;
ssize_t size;
spin_lock(&dq_data_lock);
info->dqi_flags &= ~DQF_INFO_DIRTY;
dinfo.dqi_bgrace = cpu_to_le32(info->dqi_bgrace);
dinfo.dqi_igrace = cpu_to_le32(info->dqi_igrace);
spin_unlock(&dq_data_lock);
dinfo.dqi_syncms = cpu_to_le32(oinfo->dqi_syncms);
dinfo.dqi_blocks = cpu_to_le32(oinfo->dqi_gi.dqi_blocks);
dinfo.dqi_free_blk = cpu_to_le32(oinfo->dqi_gi.dqi_free_blk);
dinfo.dqi_free_entry = cpu_to_le32(oinfo->dqi_gi.dqi_free_entry);
size = sb->s_op->quota_write(sb, type, (char *)&dinfo,
sizeof(struct ocfs2_global_disk_dqinfo),
OCFS2_GLOBAL_INFO_OFF);
if (size != sizeof(struct ocfs2_global_disk_dqinfo)) {
mlog(ML_ERROR, "Cannot write global quota info structure\n");
if (size >= 0)
size = -EIO;
return size;
}
return 0;
}
int ocfs2_global_write_info(struct super_block *sb, int type)
{
int err;
struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv;
err = ocfs2_qinfo_lock(info, 1);
if (err < 0)
return err;
err = __ocfs2_global_write_info(sb, type);
ocfs2_qinfo_unlock(info, 1);
return err;
}
/* Read in information from global quota file and acquire a reference to it.
* dquot_acquire() has already started the transaction and locked quota file */
int ocfs2_global_read_dquot(struct dquot *dquot)
{
int err, err2, ex = 0;
struct ocfs2_mem_dqinfo *info =
sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv;
err = ocfs2_qinfo_lock(info, 0);
if (err < 0)
goto out;
err = qtree_read_dquot(&info->dqi_gi, dquot);
if (err < 0)
goto out_qlock;
OCFS2_DQUOT(dquot)->dq_use_count++;
OCFS2_DQUOT(dquot)->dq_origspace = dquot->dq_dqb.dqb_curspace;
OCFS2_DQUOT(dquot)->dq_originodes = dquot->dq_dqb.dqb_curinodes;
if (!dquot->dq_off) { /* No real quota entry? */
/* Upgrade to exclusive lock for allocation */
err = ocfs2_qinfo_lock(info, 1);
if (err < 0)
goto out_qlock;
ex = 1;
}
err = qtree_write_dquot(&info->dqi_gi, dquot);
if (ex && info_dirty(sb_dqinfo(dquot->dq_sb, dquot->dq_type))) {
err2 = __ocfs2_global_write_info(dquot->dq_sb, dquot->dq_type);
if (!err)
err = err2;
}
out_qlock:
if (ex)
ocfs2_qinfo_unlock(info, 1);
ocfs2_qinfo_unlock(info, 0);
out:
if (err < 0)
mlog_errno(err);
return err;
}
/* Sync local information about quota modifications with global quota file.
* Caller must have started the transaction and obtained exclusive lock for
* global quota file inode */
int __ocfs2_sync_dquot(struct dquot *dquot, int freeing)
{
int err, err2;
struct super_block *sb = dquot->dq_sb;
int type = dquot->dq_type;
struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv;
struct ocfs2_global_disk_dqblk dqblk;
s64 spacechange, inodechange;
time_t olditime, oldbtime;
err = sb->s_op->quota_read(sb, type, (char *)&dqblk,
sizeof(struct ocfs2_global_disk_dqblk),
dquot->dq_off);
if (err != sizeof(struct ocfs2_global_disk_dqblk)) {
if (err >= 0) {
mlog(ML_ERROR, "Short read from global quota file "
"(%u read)\n", err);
err = -EIO;
}
goto out;
}
/* Update space and inode usage. Get also other information from
* global quota file so that we don't overwrite any changes there.
* We are */
spin_lock(&dq_data_lock);
spacechange = dquot->dq_dqb.dqb_curspace -
OCFS2_DQUOT(dquot)->dq_origspace;
inodechange = dquot->dq_dqb.dqb_curinodes -
OCFS2_DQUOT(dquot)->dq_originodes;
olditime = dquot->dq_dqb.dqb_itime;
oldbtime = dquot->dq_dqb.dqb_btime;
ocfs2_global_disk2memdqb(dquot, &dqblk);
mlog(0, "Syncing global dquot %u space %lld+%lld, inodes %lld+%lld\n",
dquot->dq_id, dquot->dq_dqb.dqb_curspace, (long long)spacechange,
dquot->dq_dqb.dqb_curinodes, (long long)inodechange);
if (!test_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags))
dquot->dq_dqb.dqb_curspace += spacechange;
if (!test_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags))
dquot->dq_dqb.dqb_curinodes += inodechange;
/* Set properly space grace time... */
if (dquot->dq_dqb.dqb_bsoftlimit &&
dquot->dq_dqb.dqb_curspace > dquot->dq_dqb.dqb_bsoftlimit) {
if (!test_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags) &&
oldbtime > 0) {
if (dquot->dq_dqb.dqb_btime > 0)
dquot->dq_dqb.dqb_btime =
min(dquot->dq_dqb.dqb_btime, oldbtime);
else
dquot->dq_dqb.dqb_btime = oldbtime;
}
} else {
dquot->dq_dqb.dqb_btime = 0;
clear_bit(DQ_BLKS_B, &dquot->dq_flags);
}
/* Set properly inode grace time... */
if (dquot->dq_dqb.dqb_isoftlimit &&
dquot->dq_dqb.dqb_curinodes > dquot->dq_dqb.dqb_isoftlimit) {
if (!test_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags) &&
olditime > 0) {
if (dquot->dq_dqb.dqb_itime > 0)
dquot->dq_dqb.dqb_itime =
min(dquot->dq_dqb.dqb_itime, olditime);
else
dquot->dq_dqb.dqb_itime = olditime;
}
} else {
dquot->dq_dqb.dqb_itime = 0;
clear_bit(DQ_INODES_B, &dquot->dq_flags);
}
/* All information is properly updated, clear the flags */
__clear_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags);
__clear_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags);
__clear_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags);
__clear_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags);
__clear_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags);
__clear_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags);
OCFS2_DQUOT(dquot)->dq_origspace = dquot->dq_dqb.dqb_curspace;
OCFS2_DQUOT(dquot)->dq_originodes = dquot->dq_dqb.dqb_curinodes;
spin_unlock(&dq_data_lock);
err = ocfs2_qinfo_lock(info, freeing);
if (err < 0) {
mlog(ML_ERROR, "Failed to lock quota info, loosing quota write"
" (type=%d, id=%u)\n", dquot->dq_type,
(unsigned)dquot->dq_id);
goto out;
}
if (freeing)
OCFS2_DQUOT(dquot)->dq_use_count--;
err = qtree_write_dquot(&info->dqi_gi, dquot);
if (err < 0)
goto out_qlock;
if (freeing && !OCFS2_DQUOT(dquot)->dq_use_count) {
err = qtree_release_dquot(&info->dqi_gi, dquot);
if (info_dirty(sb_dqinfo(sb, type))) {
err2 = __ocfs2_global_write_info(sb, type);
if (!err)
err = err2;
}
}
out_qlock:
ocfs2_qinfo_unlock(info, freeing);
out:
if (err < 0)
mlog_errno(err);
return err;
}
/*
* Functions for periodic syncing of dquots with global file
*/
static int ocfs2_sync_dquot_helper(struct dquot *dquot, unsigned long type)
{
handle_t *handle;
struct super_block *sb = dquot->dq_sb;
struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
struct ocfs2_super *osb = OCFS2_SB(sb);
int status = 0;
mlog_entry("id=%u qtype=%u type=%lu device=%s\n", dquot->dq_id,
dquot->dq_type, type, sb->s_id);
if (type != dquot->dq_type)
goto out;
status = ocfs2_lock_global_qf(oinfo, 1);
if (status < 0)
goto out;
handle = ocfs2_start_trans(osb, OCFS2_QSYNC_CREDITS);
if (IS_ERR(handle)) {
status = PTR_ERR(handle);
mlog_errno(status);
goto out_ilock;
}
mutex_lock(&sb_dqopt(sb)->dqio_mutex);
status = ocfs2_sync_dquot(dquot);
mutex_unlock(&sb_dqopt(sb)->dqio_mutex);
if (status < 0)
mlog_errno(status);
/* We have to write local structure as well... */
dquot_mark_dquot_dirty(dquot);
status = dquot_commit(dquot);
if (status < 0)
mlog_errno(status);
ocfs2_commit_trans(osb, handle);
out_ilock:
ocfs2_unlock_global_qf(oinfo, 1);
out:
mlog_exit(status);
return status;
}
static void qsync_work_fn(struct work_struct *work)
{
struct ocfs2_mem_dqinfo *oinfo = container_of(work,
struct ocfs2_mem_dqinfo,
dqi_sync_work.work);
struct super_block *sb = oinfo->dqi_gqinode->i_sb;
dquot_scan_active(sb, ocfs2_sync_dquot_helper, oinfo->dqi_type);
queue_delayed_work(ocfs2_quota_wq, &oinfo->dqi_sync_work,
oinfo->dqi_syncjiff);
}
/*
* Wrappers for generic quota functions
*/
static int ocfs2_write_dquot(struct dquot *dquot)
{
handle_t *handle;
struct ocfs2_super *osb = OCFS2_SB(dquot->dq_sb);
int status = 0;
mlog_entry("id=%u, type=%d", dquot->dq_id, dquot->dq_type);
handle = ocfs2_start_trans(osb, OCFS2_QWRITE_CREDITS);
if (IS_ERR(handle)) {
status = PTR_ERR(handle);
mlog_errno(status);
goto out;
}
status = dquot_commit(dquot);
ocfs2_commit_trans(osb, handle);
out:
mlog_exit(status);
return status;
}
int ocfs2_calc_qdel_credits(struct super_block *sb, int type)
{
struct ocfs2_mem_dqinfo *oinfo;
int features[MAXQUOTAS] = { OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
OCFS2_FEATURE_RO_COMPAT_GRPQUOTA };
if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, features[type]))
return 0;
oinfo = sb_dqinfo(sb, type)->dqi_priv;
/* We modify tree, leaf block, global info, local chunk header,
* global and local inode */
return oinfo->dqi_gi.dqi_qtree_depth + 2 + 1 +
2 * OCFS2_INODE_UPDATE_CREDITS;
}
static int ocfs2_release_dquot(struct dquot *dquot)
{
handle_t *handle;
struct ocfs2_mem_dqinfo *oinfo =
sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv;
struct ocfs2_super *osb = OCFS2_SB(dquot->dq_sb);
int status = 0;
mlog_entry("id=%u, type=%d", dquot->dq_id, dquot->dq_type);
status = ocfs2_lock_global_qf(oinfo, 1);
if (status < 0)
goto out;
handle = ocfs2_start_trans(osb,
ocfs2_calc_qdel_credits(dquot->dq_sb, dquot->dq_type));
if (IS_ERR(handle)) {
status = PTR_ERR(handle);
mlog_errno(status);
goto out_ilock;
}
status = dquot_release(dquot);
ocfs2_commit_trans(osb, handle);
out_ilock:
ocfs2_unlock_global_qf(oinfo, 1);
out:
mlog_exit(status);
return status;
}
int ocfs2_calc_qinit_credits(struct super_block *sb, int type)
{
struct ocfs2_mem_dqinfo *oinfo;
int features[MAXQUOTAS] = { OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
OCFS2_FEATURE_RO_COMPAT_GRPQUOTA };
struct ocfs2_dinode *lfe, *gfe;
if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, features[type]))
return 0;
oinfo = sb_dqinfo(sb, type)->dqi_priv;
gfe = (struct ocfs2_dinode *)oinfo->dqi_gqi_bh->b_data;
lfe = (struct ocfs2_dinode *)oinfo->dqi_lqi_bh->b_data;
/* We can extend local file + global file. In local file we
* can modify info, chunk header block and dquot block. In
* global file we can modify info, tree and leaf block */
return ocfs2_calc_extend_credits(sb, &lfe->id2.i_list, 0) +
ocfs2_calc_extend_credits(sb, &gfe->id2.i_list, 0) +
3 + oinfo->dqi_gi.dqi_qtree_depth + 2;
}
static int ocfs2_acquire_dquot(struct dquot *dquot)
{
handle_t *handle;
struct ocfs2_mem_dqinfo *oinfo =
sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv;
struct ocfs2_super *osb = OCFS2_SB(dquot->dq_sb);
int status = 0;
mlog_entry("id=%u, type=%d", dquot->dq_id, dquot->dq_type);
/* We need an exclusive lock, because we're going to update use count
* and instantiate possibly new dquot structure */
status = ocfs2_lock_global_qf(oinfo, 1);
if (status < 0)
goto out;
handle = ocfs2_start_trans(osb,
ocfs2_calc_qinit_credits(dquot->dq_sb, dquot->dq_type));
if (IS_ERR(handle)) {
status = PTR_ERR(handle);
mlog_errno(status);
goto out_ilock;
}
status = dquot_acquire(dquot);
ocfs2_commit_trans(osb, handle);
out_ilock:
ocfs2_unlock_global_qf(oinfo, 1);
out:
mlog_exit(status);
return status;
}
static int ocfs2_mark_dquot_dirty(struct dquot *dquot)
{
unsigned long mask = (1 << (DQ_LASTSET_B + QIF_ILIMITS_B)) |
(1 << (DQ_LASTSET_B + QIF_BLIMITS_B)) |
(1 << (DQ_LASTSET_B + QIF_INODES_B)) |
(1 << (DQ_LASTSET_B + QIF_SPACE_B)) |
(1 << (DQ_LASTSET_B + QIF_BTIME_B)) |
(1 << (DQ_LASTSET_B + QIF_ITIME_B));
int sync = 0;
int status;
struct super_block *sb = dquot->dq_sb;
int type = dquot->dq_type;
struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
handle_t *handle;
struct ocfs2_super *osb = OCFS2_SB(sb);
mlog_entry("id=%u, type=%d", dquot->dq_id, type);
dquot_mark_dquot_dirty(dquot);
/* In case user set some limits, sync dquot immediately to global
* quota file so that information propagates quicker */
spin_lock(&dq_data_lock);
if (dquot->dq_flags & mask)
sync = 1;
spin_unlock(&dq_data_lock);
if (!sync) {
status = ocfs2_write_dquot(dquot);
goto out;
}
status = ocfs2_lock_global_qf(oinfo, 1);
if (status < 0)
goto out;
handle = ocfs2_start_trans(osb, OCFS2_QSYNC_CREDITS);
if (IS_ERR(handle)) {
status = PTR_ERR(handle);
mlog_errno(status);
goto out_ilock;
}
status = ocfs2_sync_dquot(dquot);
if (status < 0) {
mlog_errno(status);
goto out_trans;
}
/* Now write updated local dquot structure */
status = dquot_commit(dquot);
out_trans:
ocfs2_commit_trans(osb, handle);
out_ilock:
ocfs2_unlock_global_qf(oinfo, 1);
out:
mlog_exit(status);
return status;
}
/* This should happen only after set_dqinfo(). */
static int ocfs2_write_info(struct super_block *sb, int type)
{
handle_t *handle;
int status = 0;
struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
mlog_entry_void();
status = ocfs2_lock_global_qf(oinfo, 1);
if (status < 0)
goto out;
handle = ocfs2_start_trans(OCFS2_SB(sb), OCFS2_QINFO_WRITE_CREDITS);
if (IS_ERR(handle)) {
status = PTR_ERR(handle);
mlog_errno(status);
goto out_ilock;
}
status = dquot_commit_info(sb, type);
ocfs2_commit_trans(OCFS2_SB(sb), handle);
out_ilock:
ocfs2_unlock_global_qf(oinfo, 1);
out:
mlog_exit(status);
return status;
}
/* This is difficult. We have to lock quota inode and start transaction
* in this function but we don't want to take the penalty of exlusive
* quota file lock when we are just going to use cached structures. So
* we just take read lock check whether we have dquot cached and if so,
* we don't have to take the write lock... */
static int ocfs2_dquot_initialize(struct inode *inode, int type)
{
handle_t *handle = NULL;
int status = 0;
struct super_block *sb = inode->i_sb;
struct ocfs2_mem_dqinfo *oinfo;
int exclusive = 0;
int cnt;
qid_t id;
mlog_entry_void();
for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
if (type != -1 && cnt != type)
continue;
if (!sb_has_quota_active(sb, cnt))
continue;
oinfo = sb_dqinfo(sb, cnt)->dqi_priv;
status = ocfs2_lock_global_qf(oinfo, 0);
if (status < 0)
goto out;
/* This is just a performance optimization not a reliable test.
* Since we hold an inode lock, noone can actually release
* the structure until we are finished with initialization. */
if (inode->i_dquot[cnt] != NODQUOT) {
ocfs2_unlock_global_qf(oinfo, 0);
continue;
}
/* When we have inode lock, we know that no dquot_release() can
* run and thus we can safely check whether we need to
* read+modify global file to get quota information or whether
* our node already has it. */
if (cnt == USRQUOTA)
id = inode->i_uid;
else if (cnt == GRPQUOTA)
id = inode->i_gid;
else
BUG();
/* Obtain exclusion from quota off... */
down_write(&sb_dqopt(sb)->dqptr_sem);
exclusive = !dquot_is_cached(sb, id, cnt);
up_write(&sb_dqopt(sb)->dqptr_sem);
if (exclusive) {
status = ocfs2_lock_global_qf(oinfo, 1);
if (status < 0) {
exclusive = 0;
mlog_errno(status);
goto out_ilock;
}
handle = ocfs2_start_trans(OCFS2_SB(sb),
ocfs2_calc_qinit_credits(sb, cnt));
if (IS_ERR(handle)) {
status = PTR_ERR(handle);
mlog_errno(status);
goto out_ilock;
}
}
dquot_initialize(inode, cnt);
if (exclusive) {
ocfs2_commit_trans(OCFS2_SB(sb), handle);
ocfs2_unlock_global_qf(oinfo, 1);
}
ocfs2_unlock_global_qf(oinfo, 0);
}
mlog_exit(0);
return 0;
out_ilock:
if (exclusive)
ocfs2_unlock_global_qf(oinfo, 1);
ocfs2_unlock_global_qf(oinfo, 0);
out:
mlog_exit(status);
return status;
}
static int ocfs2_dquot_drop_slow(struct inode *inode)
{
int status = 0;
int cnt;
int got_lock[MAXQUOTAS] = {0, 0};
handle_t *handle;
struct super_block *sb = inode->i_sb;
struct ocfs2_mem_dqinfo *oinfo;
for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
if (!sb_has_quota_active(sb, cnt))
continue;
oinfo = sb_dqinfo(sb, cnt)->dqi_priv;
status = ocfs2_lock_global_qf(oinfo, 1);
if (status < 0)
goto out;
got_lock[cnt] = 1;
}
handle = ocfs2_start_trans(OCFS2_SB(sb),
ocfs2_calc_qinit_credits(sb, USRQUOTA) +
ocfs2_calc_qinit_credits(sb, GRPQUOTA));
if (IS_ERR(handle)) {
status = PTR_ERR(handle);
mlog_errno(status);
goto out;
}
dquot_drop(inode);
ocfs2_commit_trans(OCFS2_SB(sb), handle);
out:
for (cnt = 0; cnt < MAXQUOTAS; cnt++)
if (got_lock[cnt]) {
oinfo = sb_dqinfo(sb, cnt)->dqi_priv;
ocfs2_unlock_global_qf(oinfo, 1);
}
return status;
}
/* See the comment before ocfs2_dquot_initialize. */
static int ocfs2_dquot_drop(struct inode *inode)
{
int status = 0;
struct super_block *sb = inode->i_sb;
struct ocfs2_mem_dqinfo *oinfo;
int exclusive = 0;
int cnt;
int got_lock[MAXQUOTAS] = {0, 0};
mlog_entry_void();
for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
if (!sb_has_quota_active(sb, cnt))
continue;
oinfo = sb_dqinfo(sb, cnt)->dqi_priv;
status = ocfs2_lock_global_qf(oinfo, 0);
if (status < 0)
goto out;
got_lock[cnt] = 1;
}
/* Lock against anyone releasing references so that when when we check
* we know we are not going to be last ones to release dquot */
down_write(&sb_dqopt(sb)->dqptr_sem);
/* Urgh, this is a terrible hack :( */
for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
if (inode->i_dquot[cnt] != NODQUOT &&
atomic_read(&inode->i_dquot[cnt]->dq_count) > 1) {
exclusive = 1;
break;
}
}
if (!exclusive)
dquot_drop_locked(inode);
up_write(&sb_dqopt(sb)->dqptr_sem);
out:
for (cnt = 0; cnt < MAXQUOTAS; cnt++)
if (got_lock[cnt]) {
oinfo = sb_dqinfo(sb, cnt)->dqi_priv;
ocfs2_unlock_global_qf(oinfo, 0);
}
/* In case we bailed out because we had to do expensive locking
* do it now... */
if (exclusive)
status = ocfs2_dquot_drop_slow(inode);
mlog_exit(status);
return status;
}
static struct dquot *ocfs2_alloc_dquot(struct super_block *sb, int type)
{
struct ocfs2_dquot *dquot =
kmem_cache_zalloc(ocfs2_dquot_cachep, GFP_NOFS);
if (!dquot)
return NULL;
return &dquot->dq_dquot;
}
static void ocfs2_destroy_dquot(struct dquot *dquot)
{
kmem_cache_free(ocfs2_dquot_cachep, dquot);
}
struct dquot_operations ocfs2_quota_operations = {
.initialize = ocfs2_dquot_initialize,
.drop = ocfs2_dquot_drop,
.alloc_space = dquot_alloc_space,
.alloc_inode = dquot_alloc_inode,
.free_space = dquot_free_space,
.free_inode = dquot_free_inode,
.transfer = dquot_transfer,
.write_dquot = ocfs2_write_dquot,
.acquire_dquot = ocfs2_acquire_dquot,
.release_dquot = ocfs2_release_dquot,
.mark_dirty = ocfs2_mark_dquot_dirty,
.write_info = ocfs2_write_info,
.alloc_dquot = ocfs2_alloc_dquot,
.destroy_dquot = ocfs2_destroy_dquot,
};
int ocfs2_quota_setup(void)
{
ocfs2_quota_wq = create_workqueue("o2quot");
if (!ocfs2_quota_wq)
return -ENOMEM;
return 0;
}
void ocfs2_quota_shutdown(void)
{
if (ocfs2_quota_wq) {
flush_workqueue(ocfs2_quota_wq);
destroy_workqueue(ocfs2_quota_wq);
ocfs2_quota_wq = NULL;
}
}
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