1 files changed, 406 insertions, 0 deletions
diff --git a/include/linux/quotaops.h b/include/linux/quotaops.h
new file mode 100644
index 000000000..3abd249ec
--- /dev/null
+++ b/include/linux/quotaops.h
@@ -0,0 +1,406 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Definitions for diskquota-operations. When diskquota is configured these
+ * macros expand to the right source-code.
+ *
+ * Author:  Marco van Wieringen <mvw@planets.elm.net>
+ */
+#ifndef _LINUX_QUOTAOPS_
+#define _LINUX_QUOTAOPS_
+
+#include <linux/fs.h>
+
+#define DQUOT_SPACE_WARN	0x1
+#define DQUOT_SPACE_RESERVE	0x2
+#define DQUOT_SPACE_NOFAIL	0x4
+
+static inline struct quota_info *sb_dqopt(struct super_block *sb)
+{
+	return &sb->s_dquot;
+}
+
+/* i_mutex must being held */
+static inline bool is_quota_modification(struct user_namespace *mnt_userns,
+					 struct inode *inode, struct iattr *ia)
+{
+	return ((ia->ia_valid & ATTR_SIZE) ||
+		i_uid_needs_update(mnt_userns, ia, inode) ||
+		i_gid_needs_update(mnt_userns, ia, inode));
+}
+
+#if defined(CONFIG_QUOTA)
+
+#define quota_error(sb, fmt, args...) \
+	__quota_error((sb), __func__, fmt , ## args)
+
+extern __printf(3, 4)
+void __quota_error(struct super_block *sb, const char *func,
+		   const char *fmt, ...);
+
+/*
+ * declaration of quota_function calls in kernel.
+ */
+int dquot_initialize(struct inode *inode);
+bool dquot_initialize_needed(struct inode *inode);
+void dquot_drop(struct inode *inode);
+struct dquot *dqget(struct super_block *sb, struct kqid qid);
+static inline struct dquot *dqgrab(struct dquot *dquot)
+{
+	/* Make sure someone else has active reference to dquot */
+	WARN_ON_ONCE(!atomic_read(&dquot->dq_count));
+	WARN_ON_ONCE(!test_bit(DQ_ACTIVE_B, &dquot->dq_flags));
+	atomic_inc(&dquot->dq_count);
+	return dquot;
+}
+
+static inline bool dquot_is_busy(struct dquot *dquot)
+{
+	if (test_bit(DQ_MOD_B, &dquot->dq_flags))
+		return true;
+	if (atomic_read(&dquot->dq_count) > 0)
+		return true;
+	return false;
+}
+
+void dqput(struct dquot *dquot);
+int dquot_scan_active(struct super_block *sb,
+		      int (*fn)(struct dquot *dquot, unsigned long priv),
+		      unsigned long priv);
+struct dquot *dquot_alloc(struct super_block *sb, int type);
+void dquot_destroy(struct dquot *dquot);
+
+int __dquot_alloc_space(struct inode *inode, qsize_t number, int flags);
+void __dquot_free_space(struct inode *inode, qsize_t number, int flags);
+
+int dquot_alloc_inode(struct inode *inode);
+
+int dquot_claim_space_nodirty(struct inode *inode, qsize_t number);
+void dquot_free_inode(struct inode *inode);
+void dquot_reclaim_space_nodirty(struct inode *inode, qsize_t number);
+
+int dquot_disable(struct super_block *sb, int type, unsigned int flags);
+/* Suspend quotas on remount RO */
+static inline int dquot_suspend(struct super_block *sb, int type)
+{
+	return dquot_disable(sb, type, DQUOT_SUSPENDED);
+}
+int dquot_resume(struct super_block *sb, int type);
+
+int dquot_commit(struct dquot *dquot);
+int dquot_acquire(struct dquot *dquot);
+int dquot_release(struct dquot *dquot);
+int dquot_commit_info(struct super_block *sb, int type);
+int dquot_get_next_id(struct super_block *sb, struct kqid *qid);
+int dquot_mark_dquot_dirty(struct dquot *dquot);
+
+int dquot_file_open(struct inode *inode, struct file *file);
+
+int dquot_load_quota_sb(struct super_block *sb, int type, int format_id,
+	unsigned int flags);
+int dquot_load_quota_inode(struct inode *inode, int type, int format_id,
+	unsigned int flags);
+int dquot_quota_on(struct super_block *sb, int type, int format_id,
+	const struct path *path);
+int dquot_quota_on_mount(struct super_block *sb, char *qf_name,
+ 	int format_id, int type);
+int dquot_quota_off(struct super_block *sb, int type);
+int dquot_writeback_dquots(struct super_block *sb, int type);
+int dquot_quota_sync(struct super_block *sb, int type);
+int dquot_get_state(struct super_block *sb, struct qc_state *state);
+int dquot_set_dqinfo(struct super_block *sb, int type, struct qc_info *ii);
+int dquot_get_dqblk(struct super_block *sb, struct kqid id,
+		struct qc_dqblk *di);
+int dquot_get_next_dqblk(struct super_block *sb, struct kqid *id,
+		struct qc_dqblk *di);
+int dquot_set_dqblk(struct super_block *sb, struct kqid id,
+		struct qc_dqblk *di);
+
+int __dquot_transfer(struct inode *inode, struct dquot **transfer_to);
+int dquot_transfer(struct user_namespace *mnt_userns, struct inode *inode,
+		   struct iattr *iattr);
+
+static inline struct mem_dqinfo *sb_dqinfo(struct super_block *sb, int type)
+{
+	return sb_dqopt(sb)->info + type;
+}
+
+/*
+ * Functions for checking status of quota
+ */
+
+static inline bool sb_has_quota_usage_enabled(struct super_block *sb, int type)
+{
+	return sb_dqopt(sb)->flags &
+				dquot_state_flag(DQUOT_USAGE_ENABLED, type);
+}
+
+static inline bool sb_has_quota_limits_enabled(struct super_block *sb, int type)
+{
+	return sb_dqopt(sb)->flags &
+				dquot_state_flag(DQUOT_LIMITS_ENABLED, type);
+}
+
+static inline bool sb_has_quota_suspended(struct super_block *sb, int type)
+{
+	return sb_dqopt(sb)->flags &
+				dquot_state_flag(DQUOT_SUSPENDED, type);
+}
+
+static inline unsigned sb_any_quota_suspended(struct super_block *sb)
+{
+	return dquot_state_types(sb_dqopt(sb)->flags, DQUOT_SUSPENDED);
+}
+
+/* Does kernel know about any quota information for given sb + type? */
+static inline bool sb_has_quota_loaded(struct super_block *sb, int type)
+{
+	/* Currently if anything is on, then quota usage is on as well */
+	return sb_has_quota_usage_enabled(sb, type);
+}
+
+static inline unsigned sb_any_quota_loaded(struct super_block *sb)
+{
+	return dquot_state_types(sb_dqopt(sb)->flags, DQUOT_USAGE_ENABLED);
+}
+
+static inline bool sb_has_quota_active(struct super_block *sb, int type)
+{
+	return sb_has_quota_loaded(sb, type) &&
+	       !sb_has_quota_suspended(sb, type);
+}
+
+/*
+ * Operations supported for diskquotas.
+ */
+extern const struct dquot_operations dquot_operations;
+extern const struct quotactl_ops dquot_quotactl_sysfile_ops;
+
+#else
+
+static inline int sb_has_quota_usage_enabled(struct super_block *sb, int type)
+{
+	return 0;
+}
+
+static inline int sb_has_quota_limits_enabled(struct super_block *sb, int type)
+{
+	return 0;
+}
+
+static inline int sb_has_quota_suspended(struct super_block *sb, int type)
+{
+	return 0;
+}
+
+static inline int sb_any_quota_suspended(struct super_block *sb)
+{
+	return 0;
+}
+
+/* Does kernel know about any quota information for given sb + type? */
+static inline int sb_has_quota_loaded(struct super_block *sb, int type)
+{
+	return 0;
+}
+
+static inline int sb_any_quota_loaded(struct super_block *sb)
+{
+	return 0;
+}
+
+static inline int sb_has_quota_active(struct super_block *sb, int type)
+{
+	return 0;
+}
+
+static inline int dquot_initialize(struct inode *inode)
+{
+	return 0;
+}
+
+static inline bool dquot_initialize_needed(struct inode *inode)
+{
+	return false;
+}
+
+static inline void dquot_drop(struct inode *inode)
+{
+}
+
+static inline int dquot_alloc_inode(struct inode *inode)
+{
+	return 0;
+}
+
+static inline void dquot_free_inode(struct inode *inode)
+{
+}
+
+static inline int dquot_transfer(struct user_namespace *mnt_userns,
+				 struct inode *inode, struct iattr *iattr)
+{
+	return 0;
+}
+
+static inline int __dquot_alloc_space(struct inode *inode, qsize_t number,
+		int flags)
+{
+	if (!(flags & DQUOT_SPACE_RESERVE))
+		inode_add_bytes(inode, number);
+	return 0;
+}
+
+static inline void __dquot_free_space(struct inode *inode, qsize_t number,
+		int flags)
+{
+	if (!(flags & DQUOT_SPACE_RESERVE))
+		inode_sub_bytes(inode, number);
+}
+
+static inline int dquot_claim_space_nodirty(struct inode *inode, qsize_t number)
+{
+	inode_add_bytes(inode, number);
+	return 0;
+}
+
+static inline int dquot_reclaim_space_nodirty(struct inode *inode,
+					      qsize_t number)
+{
+	inode_sub_bytes(inode, number);
+	return 0;
+}
+
+static inline int dquot_disable(struct super_block *sb, int type,
+		unsigned int flags)
+{
+	return 0;
+}
+
+static inline int dquot_suspend(struct super_block *sb, int type)
+{
+	return 0;
+}
+
+static inline int dquot_resume(struct super_block *sb, int type)
+{
+	return 0;
+}
+
+#define dquot_file_open		generic_file_open
+
+static inline int dquot_writeback_dquots(struct super_block *sb, int type)
+{
+	return 0;
+}
+
+#endif /* CONFIG_QUOTA */
+
+static inline int dquot_alloc_space_nodirty(struct inode *inode, qsize_t nr)
+{
+	return __dquot_alloc_space(inode, nr, DQUOT_SPACE_WARN);
+}
+
+static inline void dquot_alloc_space_nofail(struct inode *inode, qsize_t nr)
+{
+	__dquot_alloc_space(inode, nr, DQUOT_SPACE_WARN|DQUOT_SPACE_NOFAIL);
+	mark_inode_dirty_sync(inode);
+}
+
+static inline int dquot_alloc_space(struct inode *inode, qsize_t nr)
+{
+	int ret;
+
+	ret = dquot_alloc_space_nodirty(inode, nr);
+	if (!ret) {
+		/*
+		 * Mark inode fully dirty. Since we are allocating blocks, inode
+		 * would become fully dirty soon anyway and it reportedly
+		 * reduces lock contention.
+		 */
+		mark_inode_dirty(inode);
+	}
+	return ret;
+}
+
+static inline int dquot_alloc_block_nodirty(struct inode *inode, qsize_t nr)
+{
+	return dquot_alloc_space_nodirty(inode, nr << inode->i_blkbits);
+}
+
+static inline void dquot_alloc_block_nofail(struct inode *inode, qsize_t nr)
+{
+	dquot_alloc_space_nofail(inode, nr << inode->i_blkbits);
+}
+
+static inline int dquot_alloc_block(struct inode *inode, qsize_t nr)
+{
+	return dquot_alloc_space(inode, nr << inode->i_blkbits);
+}
+
+static inline int dquot_prealloc_block_nodirty(struct inode *inode, qsize_t nr)
+{
+	return __dquot_alloc_space(inode, nr << inode->i_blkbits, 0);
+}
+
+static inline int dquot_prealloc_block(struct inode *inode, qsize_t nr)
+{
+	int ret;
+
+	ret = dquot_prealloc_block_nodirty(inode, nr);
+	if (!ret)
+		mark_inode_dirty_sync(inode);
+	return ret;
+}
+
+static inline int dquot_reserve_block(struct inode *inode, qsize_t nr)
+{
+	return __dquot_alloc_space(inode, nr << inode->i_blkbits,
+				DQUOT_SPACE_WARN|DQUOT_SPACE_RESERVE);
+}
+
+static inline int dquot_claim_block(struct inode *inode, qsize_t nr)
+{
+	int ret;
+
+	ret = dquot_claim_space_nodirty(inode, nr << inode->i_blkbits);
+	if (!ret)
+		mark_inode_dirty_sync(inode);
+	return ret;
+}
+
+static inline void dquot_reclaim_block(struct inode *inode, qsize_t nr)
+{
+	dquot_reclaim_space_nodirty(inode, nr << inode->i_blkbits);
+	mark_inode_dirty_sync(inode);
+}
+
+static inline void dquot_free_space_nodirty(struct inode *inode, qsize_t nr)
+{
+	__dquot_free_space(inode, nr, 0);
+}
+
+static inline void dquot_free_space(struct inode *inode, qsize_t nr)
+{
+	dquot_free_space_nodirty(inode, nr);
+	mark_inode_dirty_sync(inode);
+}
+
+static inline void dquot_free_block_nodirty(struct inode *inode, qsize_t nr)
+{
+	dquot_free_space_nodirty(inode, nr << inode->i_blkbits);
+}
+
+static inline void dquot_free_block(struct inode *inode, qsize_t nr)
+{
+	dquot_free_space(inode, nr << inode->i_blkbits);
+}
+
+static inline void dquot_release_reservation_block(struct inode *inode,
+		qsize_t nr)
+{
+	__dquot_free_space(inode, nr << inode->i_blkbits, DQUOT_SPACE_RESERVE);
+}
+
+unsigned int qtype_enforce_flag(int type);
+
+#endif /* _LINUX_QUOTAOPS_ */