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quota: quota core changes for quotaon on remount
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Currently, we just turn quotas off on remount of filesystem to read-only
state.  The patch below adds necessary framework so that we can turn quotas
off on remount RO but we are able to automatically reenable them again when
filesystem is remounted to RW state.  All we need to do is to keep references
to inodes of quota files when remounting RO and using these references to
reenable quotas when remounting RW.

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Jan Kara authored and Linus Torvalds committed Apr 28, 2008
1 parent 03f6e92 commit 0ff5af8
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Showing 5 changed files with 113 additions and 22 deletions.
77 changes: 68 additions & 9 deletions fs/dquot.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -1449,31 +1449,43 @@ static inline void set_enable_flags(struct quota_info *dqopt, int type)
switch (type) {
case USRQUOTA:
dqopt->flags |= DQUOT_USR_ENABLED;
dqopt->flags &= ~DQUOT_USR_SUSPENDED;
break;
case GRPQUOTA:
dqopt->flags |= DQUOT_GRP_ENABLED;
dqopt->flags &= ~DQUOT_GRP_SUSPENDED;
break;
}
}

static inline void reset_enable_flags(struct quota_info *dqopt, int type)
static inline void reset_enable_flags(struct quota_info *dqopt, int type,
int remount)
{
switch (type) {
case USRQUOTA:
dqopt->flags &= ~DQUOT_USR_ENABLED;
if (remount)
dqopt->flags |= DQUOT_USR_SUSPENDED;
else
dqopt->flags &= ~DQUOT_USR_SUSPENDED;
break;
case GRPQUOTA:
dqopt->flags &= ~DQUOT_GRP_ENABLED;
if (remount)
dqopt->flags |= DQUOT_GRP_SUSPENDED;
else
dqopt->flags &= ~DQUOT_GRP_SUSPENDED;
break;
}
}


/*
* Turn quota off on a device. type == -1 ==> quotaoff for all types (umount)
*/
int vfs_quota_off(struct super_block *sb, int type)
int vfs_quota_off(struct super_block *sb, int type, int remount)
{
int cnt;
int cnt, ret = 0;
struct quota_info *dqopt = sb_dqopt(sb);
struct inode *toputinode[MAXQUOTAS];

Expand All @@ -1483,9 +1495,17 @@ int vfs_quota_off(struct super_block *sb, int type)
toputinode[cnt] = NULL;
if (type != -1 && cnt != type)
continue;
/* If we keep inodes of quota files after remount and quotaoff
* is called, drop kept inodes. */
if (!remount && sb_has_quota_suspended(sb, cnt)) {
iput(dqopt->files[cnt]);
dqopt->files[cnt] = NULL;
reset_enable_flags(dqopt, cnt, 0);
continue;
}
if (!sb_has_quota_enabled(sb, cnt))
continue;
reset_enable_flags(dqopt, cnt);
reset_enable_flags(dqopt, cnt, remount);

/* Note: these are blocking operations */
drop_dquot_ref(sb, cnt);
Expand All @@ -1501,7 +1521,8 @@ int vfs_quota_off(struct super_block *sb, int type)
put_quota_format(dqopt->info[cnt].dqi_format);

toputinode[cnt] = dqopt->files[cnt];
dqopt->files[cnt] = NULL;
if (!remount)
dqopt->files[cnt] = NULL;
dqopt->info[cnt].dqi_flags = 0;
dqopt->info[cnt].dqi_igrace = 0;
dqopt->info[cnt].dqi_bgrace = 0;
Expand Down Expand Up @@ -1531,12 +1552,19 @@ int vfs_quota_off(struct super_block *sb, int type)
mutex_unlock(&toputinode[cnt]->i_mutex);
mark_inode_dirty(toputinode[cnt]);
}
iput(toputinode[cnt]);
mutex_unlock(&dqopt->dqonoff_mutex);
/* On remount RO, we keep the inode pointer so that we
* can reenable quota on the subsequent remount RW.
* But we have better not keep inode pointer when there
* is pending delete on the quota file... */
if (!remount)
iput(toputinode[cnt]);
else if (!toputinode[cnt]->i_nlink)
ret = -EBUSY;
}
if (sb->s_bdev)
invalidate_bdev(sb->s_bdev);
return 0;
return ret;
}

/*
Expand Down Expand Up @@ -1574,7 +1602,8 @@ static int vfs_quota_on_inode(struct inode *inode, int type, int format_id)
invalidate_bdev(sb->s_bdev);
mutex_lock(&inode->i_mutex);
mutex_lock(&dqopt->dqonoff_mutex);
if (sb_has_quota_enabled(sb, type)) {
if (sb_has_quota_enabled(sb, type) ||
sb_has_quota_suspended(sb, type)) {
error = -EBUSY;
goto out_lock;
}
Expand All @@ -1597,6 +1626,7 @@ static int vfs_quota_on_inode(struct inode *inode, int type, int format_id)

dqopt->ops[type] = fmt->qf_ops;
dqopt->info[type].dqi_format = fmt;
dqopt->info[type].dqi_fmt_id = format_id;
INIT_LIST_HEAD(&dqopt->info[type].dqi_dirty_list);
mutex_lock(&dqopt->dqio_mutex);
if ((error = dqopt->ops[type]->read_file_info(sb, type)) < 0) {
Expand Down Expand Up @@ -1632,12 +1662,41 @@ static int vfs_quota_on_inode(struct inode *inode, int type, int format_id)
return error;
}

/* Reenable quotas on remount RW */
static int vfs_quota_on_remount(struct super_block *sb, int type)
{
struct quota_info *dqopt = sb_dqopt(sb);
struct inode *inode;
int ret;

mutex_lock(&dqopt->dqonoff_mutex);
if (!sb_has_quota_suspended(sb, type)) {
mutex_unlock(&dqopt->dqonoff_mutex);
return 0;
}
BUG_ON(sb_has_quota_enabled(sb, type));

inode = dqopt->files[type];
dqopt->files[type] = NULL;
reset_enable_flags(dqopt, type, 0);
mutex_unlock(&dqopt->dqonoff_mutex);

ret = vfs_quota_on_inode(inode, type, dqopt->info[type].dqi_fmt_id);
iput(inode);

return ret;
}

/* Actual function called from quotactl() */
int vfs_quota_on(struct super_block *sb, int type, int format_id, char *path)
int vfs_quota_on(struct super_block *sb, int type, int format_id, char *path,
int remount)
{
struct nameidata nd;
int error;

if (remount)
return vfs_quota_on_remount(sb, type);

error = path_lookup(path, LOOKUP_FOLLOW, &nd);
if (error < 0)
return error;
Expand Down
5 changes: 2 additions & 3 deletions fs/quota.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -69,7 +69,6 @@ static int generic_quotactl_valid(struct super_block *sb, int type, int cmd, qid
switch (cmd) {
case Q_GETFMT:
case Q_GETINFO:
case Q_QUOTAOFF:
case Q_SETINFO:
case Q_SETQUOTA:
case Q_GETQUOTA:
Expand Down Expand Up @@ -229,12 +228,12 @@ static int do_quotactl(struct super_block *sb, int type, int cmd, qid_t id, void

if (IS_ERR(pathname = getname(addr)))
return PTR_ERR(pathname);
ret = sb->s_qcop->quota_on(sb, type, id, pathname);
ret = sb->s_qcop->quota_on(sb, type, id, pathname, 0);
putname(pathname);
return ret;
}
case Q_QUOTAOFF:
return sb->s_qcop->quota_off(sb, type);
return sb->s_qcop->quota_off(sb, type, 0);

case Q_GETFMT: {
__u32 fmt;
Expand Down
10 changes: 8 additions & 2 deletions fs/super.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -179,7 +179,7 @@ void deactivate_super(struct super_block *s)
if (atomic_dec_and_lock(&s->s_active, &sb_lock)) {
s->s_count -= S_BIAS-1;
spin_unlock(&sb_lock);
DQUOT_OFF(s);
DQUOT_OFF(s, 0);
down_write(&s->s_umount);
fs->kill_sb(s);
put_filesystem(fs);
Expand Down Expand Up @@ -608,6 +608,7 @@ static void mark_files_ro(struct super_block *sb)
int do_remount_sb(struct super_block *sb, int flags, void *data, int force)
{
int retval;
int remount_rw;

#ifdef CONFIG_BLOCK
if (!(flags & MS_RDONLY) && bdev_read_only(sb->s_bdev))
Expand All @@ -625,8 +626,11 @@ int do_remount_sb(struct super_block *sb, int flags, void *data, int force)
mark_files_ro(sb);
else if (!fs_may_remount_ro(sb))
return -EBUSY;
DQUOT_OFF(sb);
retval = DQUOT_OFF(sb, 1);
if (retval < 0 && retval != -ENOSYS)
return -EBUSY;
}
remount_rw = !(flags & MS_RDONLY) && (sb->s_flags & MS_RDONLY);

if (sb->s_op->remount_fs) {
lock_super(sb);
Expand All @@ -636,6 +640,8 @@ int do_remount_sb(struct super_block *sb, int flags, void *data, int force)
return retval;
}
sb->s_flags = (sb->s_flags & ~MS_RMT_MASK) | (flags & MS_RMT_MASK);
if (remount_rw)
DQUOT_ON_REMOUNT(sb);
return 0;
}

Expand Down
14 changes: 12 additions & 2 deletions include/linux/quota.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -202,6 +202,8 @@ struct quota_format_type;

struct mem_dqinfo {
struct quota_format_type *dqi_format;
int dqi_fmt_id; /* Id of the dqi_format - used when turning
* quotas on after remount RW */
struct list_head dqi_dirty_list; /* List of dirty dquots */
unsigned long dqi_flags;
unsigned int dqi_bgrace;
Expand Down Expand Up @@ -298,8 +300,8 @@ struct dquot_operations {

/* Operations handling requests from userspace */
struct quotactl_ops {
int (*quota_on)(struct super_block *, int, int, char *);
int (*quota_off)(struct super_block *, int);
int (*quota_on)(struct super_block *, int, int, char *, int);
int (*quota_off)(struct super_block *, int, int);
int (*quota_sync)(struct super_block *, int);
int (*get_info)(struct super_block *, int, struct if_dqinfo *);
int (*set_info)(struct super_block *, int, struct if_dqinfo *);
Expand All @@ -320,6 +322,10 @@ struct quota_format_type {

#define DQUOT_USR_ENABLED 0x01 /* User diskquotas enabled */
#define DQUOT_GRP_ENABLED 0x02 /* Group diskquotas enabled */
#define DQUOT_USR_SUSPENDED 0x04 /* User diskquotas are off, but
* we have necessary info in
* memory to turn them on */
#define DQUOT_GRP_SUSPENDED 0x08 /* The same for group quotas */

struct quota_info {
unsigned int flags; /* Flags for diskquotas on this device */
Expand All @@ -337,6 +343,10 @@ struct quota_info {
#define sb_any_quota_enabled(sb) (sb_has_quota_enabled(sb, USRQUOTA) | \
sb_has_quota_enabled(sb, GRPQUOTA))

#define sb_has_quota_suspended(sb, type) \
((type) == USRQUOTA ? (sb_dqopt(sb)->flags & DQUOT_USR_SUSPENDED) : \
(sb_dqopt(sb)->flags & DQUOT_GRP_SUSPENDED))

int register_quota_format(struct quota_format_type *fmt);
void unregister_quota_format(struct quota_format_type *fmt);

Expand Down
29 changes: 23 additions & 6 deletions include/linux/quotaops.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -37,10 +37,11 @@ extern int dquot_release(struct dquot *dquot);
extern int dquot_commit_info(struct super_block *sb, int type);
extern int dquot_mark_dquot_dirty(struct dquot *dquot);

extern int vfs_quota_on(struct super_block *sb, int type, int format_id, char *path);
extern int vfs_quota_on(struct super_block *sb, int type, int format_id,
char *path, int remount);
extern int vfs_quota_on_mount(struct super_block *sb, char *qf_name,
int format_id, int type);
extern int vfs_quota_off(struct super_block *sb, int type);
extern int vfs_quota_off(struct super_block *sb, int type, int remount);
extern int vfs_quota_sync(struct super_block *sb, int type);
extern int vfs_get_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii);
extern int vfs_set_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii);
Expand Down Expand Up @@ -175,12 +176,27 @@ static inline void DQUOT_SYNC(struct super_block *sb)
sync_dquots(sb, -1);
}

static inline int DQUOT_OFF(struct super_block *sb)
static inline int DQUOT_OFF(struct super_block *sb, int remount)
{
int ret = -ENOSYS;

if (sb_any_quota_enabled(sb) && sb->s_qcop && sb->s_qcop->quota_off)
ret = sb->s_qcop->quota_off(sb, -1);
if (sb->s_qcop && sb->s_qcop->quota_off)
ret = sb->s_qcop->quota_off(sb, -1, remount);
return ret;
}

static inline int DQUOT_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;
}

Expand All @@ -196,7 +212,8 @@ static inline int DQUOT_OFF(struct super_block *sb)
#define DQUOT_ALLOC_INODE(inode) (0)
#define DQUOT_FREE_INODE(inode) do { } while(0)
#define DQUOT_SYNC(sb) do { } while(0)
#define DQUOT_OFF(sb) (0)
#define DQUOT_OFF(sb, remount) (0)
#define DQUOT_ON_REMOUNT(sb) (0)
#define DQUOT_TRANSFER(inode, iattr) (0)
static inline int DQUOT_PREALLOC_SPACE_NODIRTY(struct inode *inode, qsize_t nr)
{
Expand Down

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