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authorLinus Torvalds <torvalds@linux-foundation.org>2010-05-30 09:11:11 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2010-05-30 09:11:11 -0700
commitd28619f1563140526e2f84eae436f39206f40a69 (patch)
treed93284016a0983c8f27b745a3c50738617e50995 /fs/quota/dquot.c
parent021fad8b706849c091f6e682bc5df3ce4f9ab4d7 (diff)
parentf32764bd2bbb6ea003c158b1d276b4dc9f900348 (diff)
Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs-2.6
* 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs-2.6: quota: Convert quota statistics to generic percpu_counter ext3 uses rb_node = NULL; to zero rb_root. quota: Fixup dquot_transfer reiserfs: Fix resuming of quotas on remount read-write pohmelfs: Remove dead quota code ufs: Remove dead quota code udf: Remove dead quota code quota: rename default quotactl methods to dquot_ quota: explicitly set ->dq_op and ->s_qcop quota: drop remount argument to ->quota_on and ->quota_off quota: move unmount handling into the filesystem quota: kill the vfs_dq_off and vfs_dq_quota_on_remount wrappers quota: move remount handling into the filesystem ocfs2: Fix use after free on remount read-only Fix up conflicts in fs/ext4/super.c and fs/ufs/file.c
Diffstat (limited to 'fs/quota/dquot.c')
-rw-r--r--fs/quota/dquot.c190
1 files changed, 79 insertions, 111 deletions
diff --git a/fs/quota/dquot.c b/fs/quota/dquot.c
index 1ad8bf076cf..12c233da1b6 100644
--- a/fs/quota/dquot.c
+++ b/fs/quota/dquot.c
@@ -228,10 +228,6 @@ static struct hlist_head *dquot_hash;
struct dqstats dqstats;
EXPORT_SYMBOL(dqstats);
-#ifdef CONFIG_SMP
-struct dqstats *dqstats_pcpu;
-EXPORT_SYMBOL(dqstats_pcpu);
-#endif
static qsize_t inode_get_rsv_space(struct inode *inode);
static void __dquot_initialize(struct inode *inode, int type);
@@ -584,7 +580,7 @@ out:
}
EXPORT_SYMBOL(dquot_scan_active);
-int vfs_quota_sync(struct super_block *sb, int type, int wait)
+int dquot_quota_sync(struct super_block *sb, int type, int wait)
{
struct list_head *dirty;
struct dquot *dquot;
@@ -656,7 +652,7 @@ int vfs_quota_sync(struct super_block *sb, int type, int wait)
return 0;
}
-EXPORT_SYMBOL(vfs_quota_sync);
+EXPORT_SYMBOL(dquot_quota_sync);
/* Free unused dquots from cache */
static void prune_dqcache(int count)
@@ -676,27 +672,10 @@ static void prune_dqcache(int count)
}
}
-static int dqstats_read(unsigned int type)
-{
- int count = 0;
-#ifdef CONFIG_SMP
- int cpu;
- for_each_possible_cpu(cpu)
- count += per_cpu_ptr(dqstats_pcpu, cpu)->stat[type];
- /* Statistics reading is racy, but absolute accuracy isn't required */
- if (count < 0)
- count = 0;
-#else
- count = dqstats.stat[type];
-#endif
- return count;
-}
-
/*
* This is called from kswapd when we think we need some
* more memory
*/
-
static int shrink_dqcache_memory(int nr, gfp_t gfp_mask)
{
if (nr) {
@@ -704,7 +683,9 @@ static int shrink_dqcache_memory(int nr, gfp_t gfp_mask)
prune_dqcache(nr);
spin_unlock(&dq_list_lock);
}
- return (dqstats_read(DQST_FREE_DQUOTS)/100) * sysctl_vfs_cache_pressure;
+ return ((unsigned)
+ percpu_counter_read_positive(&dqstats.counter[DQST_FREE_DQUOTS])
+ /100) * sysctl_vfs_cache_pressure;
}
static struct shrinker dqcache_shrinker = {
@@ -1815,7 +1796,7 @@ int dquot_transfer(struct inode *inode, struct iattr *iattr)
if (iattr->ia_valid & ATTR_UID && iattr->ia_uid != inode->i_uid)
transfer_to[USRQUOTA] = dqget(sb, iattr->ia_uid, USRQUOTA);
if (iattr->ia_valid & ATTR_GID && iattr->ia_gid != inode->i_gid)
- transfer_to[GRPQUOTA] = dqget(sb, iattr->ia_uid, GRPQUOTA);
+ transfer_to[GRPQUOTA] = dqget(sb, iattr->ia_gid, GRPQUOTA);
ret = __dquot_transfer(inode, transfer_to);
dqput_all(transfer_to);
@@ -1850,6 +1831,7 @@ const struct dquot_operations dquot_operations = {
.alloc_dquot = dquot_alloc,
.destroy_dquot = dquot_destroy,
};
+EXPORT_SYMBOL(dquot_operations);
/*
* Generic helper for ->open on filesystems supporting disk quotas.
@@ -1868,7 +1850,7 @@ EXPORT_SYMBOL(dquot_file_open);
/*
* Turn quota off on a device. type == -1 ==> quotaoff for all types (umount)
*/
-int vfs_quota_disable(struct super_block *sb, int type, unsigned int flags)
+int dquot_disable(struct super_block *sb, int type, unsigned int flags)
{
int cnt, ret = 0;
struct quota_info *dqopt = sb_dqopt(sb);
@@ -1998,14 +1980,15 @@ put_inodes:
}
return ret;
}
-EXPORT_SYMBOL(vfs_quota_disable);
+EXPORT_SYMBOL(dquot_disable);
-int vfs_quota_off(struct super_block *sb, int type, int remount)
+int dquot_quota_off(struct super_block *sb, int type)
{
- return vfs_quota_disable(sb, type, remount ? DQUOT_SUSPENDED :
- (DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED));
+ return dquot_disable(sb, type,
+ DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
}
-EXPORT_SYMBOL(vfs_quota_off);
+EXPORT_SYMBOL(dquot_quota_off);
+
/*
* Turn quotas on on a device
*/
@@ -2123,36 +2106,43 @@ out_fmt:
}
/* Reenable quotas on remount RW */
-static int vfs_quota_on_remount(struct super_block *sb, int type)
+int dquot_resume(struct super_block *sb, int type)
{
struct quota_info *dqopt = sb_dqopt(sb);
struct inode *inode;
- int ret;
+ int ret = 0, cnt;
unsigned int flags;
- mutex_lock(&dqopt->dqonoff_mutex);
- if (!sb_has_quota_suspended(sb, type)) {
+ for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
+ if (type != -1 && cnt != type)
+ continue;
+
+ mutex_lock(&dqopt->dqonoff_mutex);
+ if (!sb_has_quota_suspended(sb, cnt)) {
+ mutex_unlock(&dqopt->dqonoff_mutex);
+ continue;
+ }
+ inode = dqopt->files[cnt];
+ dqopt->files[cnt] = NULL;
+ spin_lock(&dq_state_lock);
+ flags = dqopt->flags & dquot_state_flag(DQUOT_USAGE_ENABLED |
+ DQUOT_LIMITS_ENABLED,
+ cnt);
+ dqopt->flags &= ~dquot_state_flag(DQUOT_STATE_FLAGS, cnt);
+ spin_unlock(&dq_state_lock);
mutex_unlock(&dqopt->dqonoff_mutex);
- return 0;
- }
- inode = dqopt->files[type];
- dqopt->files[type] = NULL;
- spin_lock(&dq_state_lock);
- flags = dqopt->flags & dquot_state_flag(DQUOT_USAGE_ENABLED |
- DQUOT_LIMITS_ENABLED, type);
- dqopt->flags &= ~dquot_state_flag(DQUOT_STATE_FLAGS, type);
- spin_unlock(&dq_state_lock);
- mutex_unlock(&dqopt->dqonoff_mutex);
- flags = dquot_generic_flag(flags, type);
- ret = vfs_load_quota_inode(inode, type, dqopt->info[type].dqi_fmt_id,
- flags);
- iput(inode);
+ flags = dquot_generic_flag(flags, cnt);
+ ret = vfs_load_quota_inode(inode, cnt,
+ dqopt->info[cnt].dqi_fmt_id, flags);
+ iput(inode);
+ }
return ret;
}
+EXPORT_SYMBOL(dquot_resume);
-int vfs_quota_on_path(struct super_block *sb, int type, int format_id,
+int dquot_quota_on_path(struct super_block *sb, int type, int format_id,
struct path *path)
{
int error = security_quota_on(path->dentry);
@@ -2167,40 +2157,36 @@ int vfs_quota_on_path(struct super_block *sb, int type, int format_id,
DQUOT_LIMITS_ENABLED);
return error;
}
-EXPORT_SYMBOL(vfs_quota_on_path);
+EXPORT_SYMBOL(dquot_quota_on_path);
-int vfs_quota_on(struct super_block *sb, int type, int format_id, char *name,
- int remount)
+int dquot_quota_on(struct super_block *sb, int type, int format_id, char *name)
{
struct path path;
int error;
- if (remount)
- return vfs_quota_on_remount(sb, type);
-
error = kern_path(name, LOOKUP_FOLLOW, &path);
if (!error) {
- error = vfs_quota_on_path(sb, type, format_id, &path);
+ error = dquot_quota_on_path(sb, type, format_id, &path);
path_put(&path);
}
return error;
}
-EXPORT_SYMBOL(vfs_quota_on);
+EXPORT_SYMBOL(dquot_quota_on);
/*
* More powerful function for turning on quotas allowing setting
* of individual quota flags
*/
-int vfs_quota_enable(struct inode *inode, int type, int format_id,
- unsigned int flags)
+int dquot_enable(struct inode *inode, int type, int format_id,
+ unsigned int flags)
{
int ret = 0;
struct super_block *sb = inode->i_sb;
struct quota_info *dqopt = sb_dqopt(sb);
/* Just unsuspend quotas? */
- if (flags & DQUOT_SUSPENDED)
- return vfs_quota_on_remount(sb, type);
+ BUG_ON(flags & DQUOT_SUSPENDED);
+
if (!flags)
return 0;
/* Just updating flags needed? */
@@ -2232,13 +2218,13 @@ out_lock:
load_quota:
return vfs_load_quota_inode(inode, type, format_id, flags);
}
-EXPORT_SYMBOL(vfs_quota_enable);
+EXPORT_SYMBOL(dquot_enable);
/*
* This function is used when filesystem needs to initialize quotas
* during mount time.
*/
-int vfs_quota_on_mount(struct super_block *sb, char *qf_name,
+int dquot_quota_on_mount(struct super_block *sb, char *qf_name,
int format_id, int type)
{
struct dentry *dentry;
@@ -2264,24 +2250,7 @@ out:
dput(dentry);
return error;
}
-EXPORT_SYMBOL(vfs_quota_on_mount);
-
-/* Wrapper to turn on quotas when remounting rw */
-int vfs_dq_quota_on_remount(struct super_block *sb)
-{
- int cnt;
- int ret = 0, err;
-
- if (!sb->s_qcop || !sb->s_qcop->quota_on)
- return -ENOSYS;
- for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
- err = sb->s_qcop->quota_on(sb, cnt, 0, NULL, 1);
- if (err < 0 && !ret)
- ret = err;
- }
- return ret;
-}
-EXPORT_SYMBOL(vfs_dq_quota_on_remount);
+EXPORT_SYMBOL(dquot_quota_on_mount);
static inline qsize_t qbtos(qsize_t blocks)
{
@@ -2316,8 +2285,8 @@ static void do_get_dqblk(struct dquot *dquot, struct fs_disk_quota *di)
spin_unlock(&dq_data_lock);
}
-int vfs_get_dqblk(struct super_block *sb, int type, qid_t id,
- struct fs_disk_quota *di)
+int dquot_get_dqblk(struct super_block *sb, int type, qid_t id,
+ struct fs_disk_quota *di)
{
struct dquot *dquot;
@@ -2329,7 +2298,7 @@ int vfs_get_dqblk(struct super_block *sb, int type, qid_t id,
return 0;
}
-EXPORT_SYMBOL(vfs_get_dqblk);
+EXPORT_SYMBOL(dquot_get_dqblk);
#define VFS_FS_DQ_MASK \
(FS_DQ_BCOUNT | FS_DQ_BSOFT | FS_DQ_BHARD | \
@@ -2428,7 +2397,7 @@ static int do_set_dqblk(struct dquot *dquot, struct fs_disk_quota *di)
return 0;
}
-int vfs_set_dqblk(struct super_block *sb, int type, qid_t id,
+int dquot_set_dqblk(struct super_block *sb, int type, qid_t id,
struct fs_disk_quota *di)
{
struct dquot *dquot;
@@ -2444,10 +2413,10 @@ int vfs_set_dqblk(struct super_block *sb, int type, qid_t id,
out:
return rc;
}
-EXPORT_SYMBOL(vfs_set_dqblk);
+EXPORT_SYMBOL(dquot_set_dqblk);
/* Generic routine for getting common part of quota file information */
-int vfs_get_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii)
+int dquot_get_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii)
{
struct mem_dqinfo *mi;
@@ -2466,10 +2435,10 @@ int vfs_get_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii)
mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
return 0;
}
-EXPORT_SYMBOL(vfs_get_dqinfo);
+EXPORT_SYMBOL(dquot_get_dqinfo);
/* Generic routine for setting common part of quota file information */
-int vfs_set_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii)
+int dquot_set_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii)
{
struct mem_dqinfo *mi;
int err = 0;
@@ -2496,27 +2465,27 @@ out:
mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
return err;
}
-EXPORT_SYMBOL(vfs_set_dqinfo);
+EXPORT_SYMBOL(dquot_set_dqinfo);
-const struct quotactl_ops vfs_quotactl_ops = {
- .quota_on = vfs_quota_on,
- .quota_off = vfs_quota_off,
- .quota_sync = vfs_quota_sync,
- .get_info = vfs_get_dqinfo,
- .set_info = vfs_set_dqinfo,
- .get_dqblk = vfs_get_dqblk,
- .set_dqblk = vfs_set_dqblk
+const struct quotactl_ops dquot_quotactl_ops = {
+ .quota_on = dquot_quota_on,
+ .quota_off = dquot_quota_off,
+ .quota_sync = dquot_quota_sync,
+ .get_info = dquot_get_dqinfo,
+ .set_info = dquot_set_dqinfo,
+ .get_dqblk = dquot_get_dqblk,
+ .set_dqblk = dquot_set_dqblk
};
-
+EXPORT_SYMBOL(dquot_quotactl_ops);
static int do_proc_dqstats(struct ctl_table *table, int write,
void __user *buffer, size_t *lenp, loff_t *ppos)
{
-#ifdef CONFIG_SMP
- /* Update global table */
unsigned int type = (int *)table->data - dqstats.stat;
- dqstats.stat[type] = dqstats_read(type);
-#endif
+
+ /* Update global table */
+ dqstats.stat[type] =
+ percpu_counter_sum_positive(&dqstats.counter[type]);
return proc_dointvec(table, write, buffer, lenp, ppos);
}
@@ -2609,7 +2578,7 @@ static ctl_table sys_table[] = {
static int __init dquot_init(void)
{
- int i;
+ int i, ret;
unsigned long nr_hash, order;
printk(KERN_NOTICE "VFS: Disk quotas %s\n", __DQUOT_VERSION__);
@@ -2627,12 +2596,11 @@ static int __init dquot_init(void)
if (!dquot_hash)
panic("Cannot create dquot hash table");
-#ifdef CONFIG_SMP
- dqstats_pcpu = alloc_percpu(struct dqstats);
- if (!dqstats_pcpu)
- panic("Cannot create dquot stats table");
-#endif
- memset(&dqstats, 0, sizeof(struct dqstats));
+ for (i = 0; i < _DQST_DQSTAT_LAST; i++) {
+ ret = percpu_counter_init(&dqstats.counter[i], 0);
+ if (ret)
+ panic("Cannot create dquot stat counters");
+ }
/* Find power-of-two hlist_heads which can fit into allocation */
nr_hash = (1UL << order) * PAGE_SIZE / sizeof(struct hlist_head);