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/* 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 <[email protected]>
*/
#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 inode *inode, struct iattr *ia)
{
return (ia->ia_valid & ATTR_SIZE) ||
(ia->ia_valid & ATTR_UID && !uid_eq(ia->ia_uid, inode->i_uid)) ||
(ia->ia_valid & ATTR_GID && !gid_eq(ia->ia_gid, inode->i_gid));
}
int kernel_quotactl(unsigned int cmd, const char __user *special,
qid_t id, void __user *addr);
#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_enable(struct inode *inode, int type, int format_id,
unsigned int flags);
int dquot_load_quota_sb(struct super_block *sb, 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 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 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_ */
