[PATCH 05/25] quota: Wire up ->quota_{enable, disable} callbacks into Q_QUOTA{ON, OFF}

Jan Kara
2014-12-18T15:37:57Z

Make Q_QUOTAON / Q_QUOTAOFF quotactl call ->quota_enable /
->quota_disable callback when provided. To match current behavior of
ocfs2 & ext4 we make these quotactls turn on / off quota enforcement for
appropriate quota type.

Signed-off-by: Jan Kara <jack@suse.cz>
---
fs/quota/quota.c | 31 +++++++++++++++++++++++++++----
include/linux/quotaops.h | 2 ++
2 files changed, 29 insertions(+), 4 deletions(-)

diff --git a/fs/quota/quota.c b/fs/quota/quota.c
index 5b307e2b5719..748716ffee48 100644
--- a/fs/quota/quota.c
+++ b/fs/quota/quota.c
@@ -66,18 +66,43 @@ static int quota_sync_all(int type)
return ret;
}

+unsigned int qtype_limit_flag(int type)
+{
+ switch (type) {
+ case USRQUOTA:
+ return FS_QUOTA_UDQ_ENFD;
+ case GRPQUOTA:
+ return FS_QUOTA_GDQ_ENFD;
+ case PRJQUOTA:
+ return FS_QUOTA_PDQ_ENFD;
+ }
+ return 0;
+}
+
static int quota_quotaon(struct super_block *sb, int type, int cmd, qid_t id,
struct path *path)
{
- if (!sb->s_qcop->quota_on && !sb->s_qcop->quota_on_meta)
+ if (!sb->s_qcop->quota_on && !sb->s_qcop->quota_on_meta &&
+ !sb->s_qcop->quota_enable)
return -ENOSYS;
if (sb->s_qcop->quota_on_meta)
return sb->s_qcop->quota_on_meta(sb, type, id);
+ if (sb->s_qcop->quota_enable)
+ return sb->s_qcop->quota_enable(sb, qtype_limit_flag(type));
if (IS_ERR(path))
return PTR_ERR(path);
return sb->s_qcop->quota_on(sb, type, id, path);
}

+static int quota_quotaoff(struct super_block *sb, int type)
+{
+ if (!sb->s_qcop->quota_off && !sb->s_qcop->quota_disable)
+ return -ENOSYS;
+ if (sb->s_qcop->quota_disable)
+ return sb->s_qcop->quota_disable(sb, qtype_limit_flag(type));
+ return sb->s_qcop->quota_off(sb, type);
+}
+
static int quota_getfmt(struct super_block *sb, int type, void __user *addr)
{
__u32 fmt;
@@ -328,9 +353,7 @@ static int do_quotactl(struct super_block *sb, int type, int cmd, qid_t id,
case Q_QUOTAON:
return quota_quotaon(sb, type, cmd, id, path);
case Q_QUOTAOFF:
- if (!sb->s_qcop->quota_off)
- return -ENOSYS;
- return sb->s_qcop->quota_off(sb, type);
+ return quota_quotaoff(sb, type);
case Q_GETFMT:
return quota_getfmt(sb, type, addr);
case Q_GETINFO:
diff --git a/include/linux/quotaops.h b/include/linux/quotaops.h
index f23538a6e411..20b77d115551 100644
--- a/include/linux/quotaops.h
+++ b/include/linux/quotaops.h
@@ -386,4 +386,6 @@ static inline void dquot_release_reservation_block(struct inode *inode,
__dquot_free_space(inode, nr << inode->i_blkbits, DQUOT_SPACE_RESERVE);
}

+unsigned int qtype_limit_flag(int type);
+
#endif /* _LINUX_QUOTAOPS_ */