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403 lines
10 KiB
403 lines
10 KiB
/* 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 <[email protected]> |
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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 inode *inode, struct iattr *ia) |
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{ |
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return (ia->ia_valid & ATTR_SIZE) || |
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(ia->ia_valid & ATTR_UID && !uid_eq(ia->ia_uid, inode->i_uid)) || |
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(ia->ia_valid & ATTR_GID && !gid_eq(ia->ia_gid, inode->i_gid)); |
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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 inode *inode, 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 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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