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