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-rw-r--r--fs/quota/Kconfig7
-rw-r--r--fs/quota/dquot.c111
-rw-r--r--fs/quota/netlink.c16
-rw-r--r--fs/quota/quota.c48
4 files changed, 146 insertions, 36 deletions
diff --git a/fs/quota/Kconfig b/fs/quota/Kconfig
index 880fd988436..c51df1dd237 100644
--- a/fs/quota/Kconfig
+++ b/fs/quota/Kconfig
@@ -8,9 +8,10 @@ config QUOTA
help
If you say Y here, you will be able to set per user limits for disk
usage (also called disk quotas). Currently, it works for the
- ext2, ext3, and reiserfs file system. ext3 also supports journalled
- quotas for which you don't need to run quotacheck(8) after an unclean
- shutdown.
+ ext2, ext3, ext4, jfs, ocfs2 and reiserfs file systems.
+ Note that gfs2 and xfs use their own quota system.
+ Ext3, ext4 and reiserfs also support journaled quotas for which
+ you don't need to run quotacheck(8) after an unclean shutdown.
For further details, read the Quota mini-HOWTO, available from
<http://www.tldp.org/docs.html#howto>, or the documentation provided
with the quota tools. Probably the quota support is only useful for
diff --git a/fs/quota/dquot.c b/fs/quota/dquot.c
index 05ae3c97f7a..7f30bdc57d1 100644
--- a/fs/quota/dquot.c
+++ b/fs/quota/dquot.c
@@ -528,7 +528,7 @@ restart:
if (atomic_read(&dquot->dq_count)) {
DEFINE_WAIT(wait);
- atomic_inc(&dquot->dq_count);
+ dqgrab(dquot);
prepare_to_wait(&dquot->dq_wait_unused, &wait,
TASK_UNINTERRUPTIBLE);
spin_unlock(&dq_list_lock);
@@ -581,9 +581,17 @@ int dquot_scan_active(struct super_block *sb,
dqstats_inc(DQST_LOOKUPS);
dqput(old_dquot);
old_dquot = dquot;
- ret = fn(dquot, priv);
- if (ret < 0)
- goto out;
+ /*
+ * ->release_dquot() can be racing with us. Our reference
+ * protects us from new calls to it so just wait for any
+ * outstanding call and recheck the DQ_ACTIVE_B after that.
+ */
+ wait_on_dquot(dquot);
+ if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) {
+ ret = fn(dquot, priv);
+ if (ret < 0)
+ goto out;
+ }
spin_lock(&dq_list_lock);
/* We are safe to continue now because our dquot could not
* be moved out of the inuse list while we hold the reference */
@@ -624,7 +632,7 @@ int dquot_writeback_dquots(struct super_block *sb, int type)
/* Now we have active dquot from which someone is
* holding reference so we can safely just increase
* use count */
- atomic_inc(&dquot->dq_count);
+ dqgrab(dquot);
spin_unlock(&dq_list_lock);
dqstats_inc(DQST_LOOKUPS);
err = sb->dq_op->write_dquot(dquot);
@@ -687,45 +695,39 @@ int dquot_quota_sync(struct super_block *sb, int type)
}
EXPORT_SYMBOL(dquot_quota_sync);
-/* Free unused dquots from cache */
-static void prune_dqcache(int count)
+static unsigned long
+dqcache_shrink_scan(struct shrinker *shrink, struct shrink_control *sc)
{
struct list_head *head;
struct dquot *dquot;
+ unsigned long freed = 0;
+ spin_lock(&dq_list_lock);
head = free_dquots.prev;
- while (head != &free_dquots && count) {
+ while (head != &free_dquots && sc->nr_to_scan) {
dquot = list_entry(head, struct dquot, dq_free);
remove_dquot_hash(dquot);
remove_free_dquot(dquot);
remove_inuse(dquot);
do_destroy_dquot(dquot);
- count--;
+ sc->nr_to_scan--;
+ freed++;
head = free_dquots.prev;
}
+ spin_unlock(&dq_list_lock);
+ return freed;
}
-/*
- * This is called from kswapd when we think we need some
- * more memory
- */
-static int shrink_dqcache_memory(struct shrinker *shrink,
- struct shrink_control *sc)
+static unsigned long
+dqcache_shrink_count(struct shrinker *shrink, struct shrink_control *sc)
{
- int nr = sc->nr_to_scan;
-
- if (nr) {
- spin_lock(&dq_list_lock);
- prune_dqcache(nr);
- spin_unlock(&dq_list_lock);
- }
- return ((unsigned)
- percpu_counter_read_positive(&dqstats.counter[DQST_FREE_DQUOTS])
- /100) * sysctl_vfs_cache_pressure;
+ return vfs_pressure_ratio(
+ percpu_counter_read_positive(&dqstats.counter[DQST_FREE_DQUOTS]));
}
static struct shrinker dqcache_shrinker = {
- .shrink = shrink_dqcache_memory,
+ .count_objects = dqcache_shrink_count,
+ .scan_objects = dqcache_shrink_scan,
.seeks = DEFAULT_SEEKS,
};
@@ -1094,6 +1096,14 @@ static void dquot_claim_reserved_space(struct dquot *dquot, qsize_t number)
dquot->dq_dqb.dqb_rsvspace -= number;
}
+static void dquot_reclaim_reserved_space(struct dquot *dquot, qsize_t number)
+{
+ if (WARN_ON_ONCE(dquot->dq_dqb.dqb_curspace < number))
+ number = dquot->dq_dqb.dqb_curspace;
+ dquot->dq_dqb.dqb_rsvspace += number;
+ dquot->dq_dqb.dqb_curspace -= number;
+}
+
static inline
void dquot_free_reserved_space(struct dquot *dquot, qsize_t number)
{
@@ -1439,8 +1449,11 @@ static void __dquot_initialize(struct inode *inode, int type)
* did a write before quota was turned on
*/
rsv = inode_get_rsv_space(inode);
- if (unlikely(rsv))
+ if (unlikely(rsv)) {
+ spin_lock(&dq_data_lock);
dquot_resv_space(inode->i_dquot[cnt], rsv);
+ spin_unlock(&dq_data_lock);
+ }
}
}
out_err:
@@ -1525,6 +1538,15 @@ void inode_claim_rsv_space(struct inode *inode, qsize_t number)
}
EXPORT_SYMBOL(inode_claim_rsv_space);
+void inode_reclaim_rsv_space(struct inode *inode, qsize_t number)
+{
+ spin_lock(&inode->i_lock);
+ *inode_reserved_space(inode) += number;
+ __inode_sub_bytes(inode, number);
+ spin_unlock(&inode->i_lock);
+}
+EXPORT_SYMBOL(inode_reclaim_rsv_space);
+
void inode_sub_rsv_space(struct inode *inode, qsize_t number)
{
spin_lock(&inode->i_lock);
@@ -1699,6 +1721,35 @@ int dquot_claim_space_nodirty(struct inode *inode, qsize_t number)
EXPORT_SYMBOL(dquot_claim_space_nodirty);
/*
+ * Convert allocated space back to in-memory reserved quotas
+ */
+void dquot_reclaim_space_nodirty(struct inode *inode, qsize_t number)
+{
+ int cnt;
+
+ if (!dquot_active(inode)) {
+ inode_reclaim_rsv_space(inode, number);
+ return;
+ }
+
+ down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
+ spin_lock(&dq_data_lock);
+ /* Claim reserved quotas to allocated quotas */
+ for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
+ if (inode->i_dquot[cnt])
+ dquot_reclaim_reserved_space(inode->i_dquot[cnt],
+ number);
+ }
+ /* Update inode bytes */
+ inode_reclaim_rsv_space(inode, number);
+ spin_unlock(&dq_data_lock);
+ mark_all_dquot_dirty(inode->i_dquot);
+ up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
+ return;
+}
+EXPORT_SYMBOL(dquot_reclaim_space_nodirty);
+
+/*
* This operation can block, but only after everything is updated
*/
void __dquot_free_space(struct inode *inode, qsize_t number, int flags)
@@ -2582,7 +2633,7 @@ static int do_proc_dqstats(struct ctl_table *table, int write,
return proc_dointvec(table, write, buffer, lenp, ppos);
}
-static ctl_table fs_dqstats_table[] = {
+static struct ctl_table fs_dqstats_table[] = {
{
.procname = "lookups",
.data = &dqstats.stat[DQST_LOOKUPS],
@@ -2651,7 +2702,7 @@ static ctl_table fs_dqstats_table[] = {
{ },
};
-static ctl_table fs_table[] = {
+static struct ctl_table fs_table[] = {
{
.procname = "quota",
.mode = 0555,
@@ -2660,7 +2711,7 @@ static ctl_table fs_table[] = {
{ },
};
-static ctl_table sys_table[] = {
+static struct ctl_table sys_table[] = {
{
.procname = "fs",
.mode = 0555,
diff --git a/fs/quota/netlink.c b/fs/quota/netlink.c
index 16e8abb7709..72d29177998 100644
--- a/fs/quota/netlink.c
+++ b/fs/quota/netlink.c
@@ -9,13 +9,25 @@
#include <net/netlink.h>
#include <net/genetlink.h>
+static const struct genl_multicast_group quota_mcgrps[] = {
+ { .name = "events", },
+};
+
/* Netlink family structure for quota */
static struct genl_family quota_genl_family = {
- .id = GENL_ID_GENERATE,
+ /*
+ * Needed due to multicast group ID abuse - old code assumed
+ * the family ID was also a valid multicast group ID (which
+ * isn't true) and userspace might thus rely on it. Assign a
+ * static ID for this group to make dealing with that easier.
+ */
+ .id = GENL_ID_VFS_DQUOT,
.hdrsize = 0,
.name = "VFS_DQUOT",
.version = 1,
.maxattr = QUOTA_NL_A_MAX,
+ .mcgrps = quota_mcgrps,
+ .n_mcgrps = ARRAY_SIZE(quota_mcgrps),
};
/**
@@ -78,7 +90,7 @@ void quota_send_warning(struct kqid qid, dev_t dev,
goto attr_err_out;
genlmsg_end(skb, msg_head);
- genlmsg_multicast(skb, 0, quota_genl_family.id, GFP_NOFS);
+ genlmsg_multicast(&quota_genl_family, skb, 0, 0, GFP_NOFS);
return;
attr_err_out:
printk(KERN_ERR "VFS: Not enough space to compose quota message!\n");
diff --git a/fs/quota/quota.c b/fs/quota/quota.c
index af1661f7a54..ff3f0b3cfdb 100644
--- a/fs/quota/quota.c
+++ b/fs/quota/quota.c
@@ -27,6 +27,7 @@ static int check_quotactl_permission(struct super_block *sb, int type, int cmd,
case Q_SYNC:
case Q_GETINFO:
case Q_XGETQSTAT:
+ case Q_XGETQSTATV:
case Q_XQUOTASYNC:
break;
/* allow to query information for dquots we "own" */
@@ -116,6 +117,7 @@ static int quota_setinfo(struct super_block *sb, int type, void __user *addr)
static void copy_to_if_dqblk(struct if_dqblk *dst, struct fs_disk_quota *src)
{
+ memset(dst, 0, sizeof(*dst));
dst->dqb_bhardlimit = src->d_blk_hardlimit;
dst->dqb_bsoftlimit = src->d_blk_softlimit;
dst->dqb_curspace = src->d_bcount;
@@ -217,6 +219,31 @@ static int quota_getxstate(struct super_block *sb, void __user *addr)
return ret;
}
+static int quota_getxstatev(struct super_block *sb, void __user *addr)
+{
+ struct fs_quota_statv fqs;
+ int ret;
+
+ if (!sb->s_qcop->get_xstatev)
+ return -ENOSYS;
+
+ memset(&fqs, 0, sizeof(fqs));
+ if (copy_from_user(&fqs, addr, 1)) /* Just read qs_version */
+ return -EFAULT;
+
+ /* If this kernel doesn't support user specified version, fail */
+ switch (fqs.qs_version) {
+ case FS_QSTATV_VERSION1:
+ break;
+ default:
+ return -EINVAL;
+ }
+ ret = sb->s_qcop->get_xstatev(sb, &fqs);
+ if (!ret && copy_to_user(addr, &fqs, sizeof(fqs)))
+ return -EFAULT;
+ return ret;
+}
+
static int quota_setxquota(struct super_block *sb, int type, qid_t id,
void __user *addr)
{
@@ -251,6 +278,17 @@ static int quota_getxquota(struct super_block *sb, int type, qid_t id,
return ret;
}
+static int quota_rmxquota(struct super_block *sb, void __user *addr)
+{
+ __u32 flags;
+
+ if (copy_from_user(&flags, addr, sizeof(flags)))
+ return -EFAULT;
+ if (!sb->s_qcop->rm_xquota)
+ return -ENOSYS;
+ return sb->s_qcop->rm_xquota(sb, flags);
+}
+
/* Copy parameters and call proper function */
static int do_quotactl(struct super_block *sb, int type, int cmd, qid_t id,
void __user *addr, struct path *path)
@@ -289,10 +327,13 @@ static int do_quotactl(struct super_block *sb, int type, int cmd, qid_t id,
return sb->s_qcop->quota_sync(sb, type);
case Q_XQUOTAON:
case Q_XQUOTAOFF:
- case Q_XQUOTARM:
return quota_setxstate(sb, cmd, addr);
+ case Q_XQUOTARM:
+ return quota_rmxquota(sb, addr);
case Q_XGETQSTAT:
return quota_getxstate(sb, addr);
+ case Q_XGETQSTATV:
+ return quota_getxstatev(sb, addr);
case Q_XSETQLIM:
return quota_setxquota(sb, type, id, addr);
case Q_XGETQUOTA:
@@ -307,6 +348,8 @@ static int do_quotactl(struct super_block *sb, int type, int cmd, qid_t id,
}
}
+#ifdef CONFIG_BLOCK
+
/* Return 1 if 'cmd' will block on frozen filesystem */
static int quotactl_cmd_write(int cmd)
{
@@ -315,6 +358,7 @@ static int quotactl_cmd_write(int cmd)
case Q_GETINFO:
case Q_SYNC:
case Q_XGETQSTAT:
+ case Q_XGETQSTATV:
case Q_XGETQUOTA:
case Q_XQUOTASYNC:
return 0;
@@ -322,6 +366,8 @@ static int quotactl_cmd_write(int cmd)
return 1;
}
+#endif /* CONFIG_BLOCK */
+
/*
* look up a superblock on which quota ops will be performed
* - use the name of a block device to find the superblock thereon
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-10 15:05:41 +0000