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https://github.com/edk2-porting/linux-next.git
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bc8e5f0739
Currently, __dquot_transfer() acquires its own references of dquot structures that will be put into inode. But for OCFS2, this creates a lock inversion between dq_lock (waited on in dqget) and transaction start (started in ocfs2_setattr). Currently, deadlock is impossible because dq_lock is acquired only during dquot_acquire and dquot_release and we already hold a reference to dquot structures in ocfs2_setattr so neither of these functions can be called while we call dquot_transfer. But this is rather subtle and it is hard to teach lockdep about it. So provide __dquot_transfer function that can be passed dquot references directly. OCFS2 can then pass acquired dquot references directly to __dquot_transfer with proper locking. Signed-off-by: Jan Kara <jack@suse.cz>
352 lines
8.8 KiB
C
352 lines
8.8 KiB
C
/*
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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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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 && ia->ia_size != inode->i_size) ||
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(ia->ia_valid & ATTR_UID && ia->ia_uid != inode->i_uid) ||
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(ia->ia_valid & ATTR_GID && ia->ia_gid != inode->i_gid);
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}
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#if defined(CONFIG_QUOTA)
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/*
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* declaration of quota_function calls in kernel.
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*/
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void inode_add_rsv_space(struct inode *inode, qsize_t number);
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void inode_claim_rsv_space(struct inode *inode, qsize_t number);
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void inode_sub_rsv_space(struct inode *inode, qsize_t number);
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void dquot_initialize(struct inode *inode);
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void dquot_drop(struct inode *inode);
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struct dquot *dqget(struct super_block *sb, unsigned int id, int type);
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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,
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int warn, int reserve);
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void __dquot_free_space(struct inode *inode, qsize_t number, int reserve);
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int dquot_alloc_inode(const 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(const struct inode *inode);
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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_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 vfs_quota_on(struct super_block *sb, int type, int format_id,
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char *path, int remount);
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int vfs_quota_enable(struct inode *inode, int type, int format_id,
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unsigned int flags);
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int vfs_quota_on_path(struct super_block *sb, int type, int format_id,
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struct path *path);
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int vfs_quota_on_mount(struct super_block *sb, char *qf_name,
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int format_id, int type);
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int vfs_quota_off(struct super_block *sb, int type, int remount);
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int vfs_quota_disable(struct super_block *sb, int type, unsigned int flags);
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int vfs_quota_sync(struct super_block *sb, int type, int wait);
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int vfs_get_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii);
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int vfs_set_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii);
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int vfs_get_dqblk(struct super_block *sb, int type, qid_t id,
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struct fs_disk_quota *di);
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int vfs_set_dqblk(struct super_block *sb, int type, qid_t id,
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struct fs_disk_quota *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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int vfs_dq_quota_on_remount(struct super_block *sb);
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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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unsigned type, tmsk = 0;
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for (type = 0; type < MAXQUOTAS; type++)
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tmsk |= sb_has_quota_suspended(sb, type) << type;
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return tmsk;
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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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unsigned type, tmsk = 0;
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for (type = 0; type < MAXQUOTAS; type++)
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tmsk |= sb_has_quota_loaded(sb, type) << type;
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return tmsk;
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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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static inline unsigned sb_any_quota_active(struct super_block *sb)
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{
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return sb_any_quota_loaded(sb) & ~sb_any_quota_suspended(sb);
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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 vfs_quotactl_ops;
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#define sb_dquot_ops (&dquot_operations)
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#define sb_quotactl_ops (&vfs_quotactl_ops)
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/* Cannot be called inside a transaction */
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static inline int vfs_dq_off(struct super_block *sb, int remount)
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{
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int ret = -ENOSYS;
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if (sb->s_qcop && sb->s_qcop->quota_off)
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ret = sb->s_qcop->quota_off(sb, -1, remount);
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return ret;
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}
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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 sb_any_quota_active(struct super_block *sb)
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{
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return 0;
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}
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/*
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* NO-OP when quota not configured.
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*/
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#define sb_dquot_ops (NULL)
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#define sb_quotactl_ops (NULL)
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static inline void dquot_initialize(struct inode *inode)
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{
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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(const 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(const struct inode *inode)
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{
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}
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static inline int vfs_dq_off(struct super_block *sb, int remount)
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{
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return 0;
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}
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static inline int vfs_dq_quota_on_remount(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 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 warn, int reserve)
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{
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if (!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 reserve)
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{
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if (!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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#define dquot_file_open generic_file_open
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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, 1, 0);
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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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mark_inode_dirty(inode);
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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 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, 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(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, 1, 1);
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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(inode);
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return ret;
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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(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, 1);
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}
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#endif /* _LINUX_QUOTAOPS_ */
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