diff options
Diffstat (limited to 'fs/xfs/xfs_dquot.h')
| -rw-r--r-- | fs/xfs/xfs_dquot.h | 245 |
1 files changed, 245 insertions, 0 deletions
diff --git a/fs/xfs/xfs_dquot.h b/fs/xfs/xfs_dquot.h new file mode 100644 index 000000000..80c8f851a --- /dev/null +++ b/fs/xfs/xfs_dquot.h @@ -0,0 +1,245 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2000-2005 Silicon Graphics, Inc. + * All Rights Reserved. + */ +#ifndef __XFS_DQUOT_H__ +#define __XFS_DQUOT_H__ + +/* + * Dquots are structures that hold quota information about a user or a group, + * much like inodes are for files. In fact, dquots share many characteristics + * with inodes. However, dquots can also be a centralized resource, relative + * to a collection of inodes. In this respect, dquots share some characteristics + * of the superblock. + * XFS dquots exploit both those in its algorithms. They make every attempt + * to not be a bottleneck when quotas are on and have minimal impact, if any, + * when quotas are off. + */ + +struct xfs_mount; +struct xfs_trans; + +enum { + XFS_QLOWSP_1_PCNT = 0, + XFS_QLOWSP_3_PCNT, + XFS_QLOWSP_5_PCNT, + XFS_QLOWSP_MAX +}; + +struct xfs_dquot_res { + /* Total resources allocated and reserved. */ + xfs_qcnt_t reserved; + + /* Total resources allocated. */ + xfs_qcnt_t count; + + /* Absolute and preferred limits. */ + xfs_qcnt_t hardlimit; + xfs_qcnt_t softlimit; + + /* + * For root dquots, this is the default grace period, in seconds. + * Otherwise, this is when the quota grace period expires, + * in seconds since the Unix epoch. + */ + time64_t timer; +}; + +static inline bool +xfs_dquot_res_over_limits( + const struct xfs_dquot_res *qres) +{ + if ((qres->softlimit && qres->softlimit < qres->reserved) || + (qres->hardlimit && qres->hardlimit < qres->reserved)) + return true; + return false; +} + +/* + * The incore dquot structure + */ +struct xfs_dquot { + struct list_head q_lru; + struct xfs_mount *q_mount; + xfs_dqtype_t q_type; + uint16_t q_flags; + xfs_dqid_t q_id; + uint q_nrefs; + int q_bufoffset; + xfs_daddr_t q_blkno; + xfs_fileoff_t q_fileoffset; + + struct xfs_dquot_res q_blk; /* regular blocks */ + struct xfs_dquot_res q_ino; /* inodes */ + struct xfs_dquot_res q_rtb; /* realtime blocks */ + + struct xfs_dq_logitem q_logitem; + + xfs_qcnt_t q_prealloc_lo_wmark; + xfs_qcnt_t q_prealloc_hi_wmark; + int64_t q_low_space[XFS_QLOWSP_MAX]; + struct mutex q_qlock; + struct completion q_flush; + atomic_t q_pincount; + struct wait_queue_head q_pinwait; +}; + +/* + * Lock hierarchy for q_qlock: + * XFS_QLOCK_NORMAL is the implicit default, + * XFS_QLOCK_NESTED is the dquot with the higher id in xfs_dqlock2 + */ +enum { + XFS_QLOCK_NORMAL = 0, + XFS_QLOCK_NESTED, +}; + +/* + * Manage the q_flush completion queue embedded in the dquot. This completion + * queue synchronizes processes attempting to flush the in-core dquot back to + * disk. + */ +static inline void xfs_dqflock(struct xfs_dquot *dqp) +{ + wait_for_completion(&dqp->q_flush); +} + +static inline bool xfs_dqflock_nowait(struct xfs_dquot *dqp) +{ + return try_wait_for_completion(&dqp->q_flush); +} + +static inline void xfs_dqfunlock(struct xfs_dquot *dqp) +{ + complete(&dqp->q_flush); +} + +static inline int xfs_dqlock_nowait(struct xfs_dquot *dqp) +{ + return mutex_trylock(&dqp->q_qlock); +} + +static inline void xfs_dqlock(struct xfs_dquot *dqp) +{ + mutex_lock(&dqp->q_qlock); +} + +static inline void xfs_dqunlock(struct xfs_dquot *dqp) +{ + mutex_unlock(&dqp->q_qlock); +} + +static inline int +xfs_dquot_type(const struct xfs_dquot *dqp) +{ + return dqp->q_type & XFS_DQTYPE_REC_MASK; +} + +static inline int xfs_this_quota_on(struct xfs_mount *mp, xfs_dqtype_t type) +{ + switch (type) { + case XFS_DQTYPE_USER: + return XFS_IS_UQUOTA_ON(mp); + case XFS_DQTYPE_GROUP: + return XFS_IS_GQUOTA_ON(mp); + case XFS_DQTYPE_PROJ: + return XFS_IS_PQUOTA_ON(mp); + default: + return 0; + } +} + +static inline struct xfs_dquot *xfs_inode_dquot( + struct xfs_inode *ip, + xfs_dqtype_t type) +{ + switch (type) { + case XFS_DQTYPE_USER: + return ip->i_udquot; + case XFS_DQTYPE_GROUP: + return ip->i_gdquot; + case XFS_DQTYPE_PROJ: + return ip->i_pdquot; + default: + return NULL; + } +} + +/* Decide if the dquot's limits are actually being enforced. */ +static inline bool +xfs_dquot_is_enforced( + const struct xfs_dquot *dqp) +{ + switch (xfs_dquot_type(dqp)) { + case XFS_DQTYPE_USER: + return XFS_IS_UQUOTA_ENFORCED(dqp->q_mount); + case XFS_DQTYPE_GROUP: + return XFS_IS_GQUOTA_ENFORCED(dqp->q_mount); + case XFS_DQTYPE_PROJ: + return XFS_IS_PQUOTA_ENFORCED(dqp->q_mount); + } + ASSERT(0); + return false; +} + +/* + * Check whether a dquot is under low free space conditions. We assume the quota + * is enabled and enforced. + */ +static inline bool xfs_dquot_lowsp(struct xfs_dquot *dqp) +{ + int64_t freesp; + + freesp = dqp->q_blk.hardlimit - dqp->q_blk.reserved; + if (freesp < dqp->q_low_space[XFS_QLOWSP_1_PCNT]) + return true; + + return false; +} + +void xfs_dquot_to_disk(struct xfs_disk_dquot *ddqp, struct xfs_dquot *dqp); + +#define XFS_DQ_IS_LOCKED(dqp) (mutex_is_locked(&((dqp)->q_qlock))) +#define XFS_DQ_IS_DIRTY(dqp) ((dqp)->q_flags & XFS_DQFLAG_DIRTY) + +void xfs_qm_dqdestroy(struct xfs_dquot *dqp); +int xfs_qm_dqflush(struct xfs_dquot *dqp, struct xfs_buf **bpp); +void xfs_qm_dqunpin_wait(struct xfs_dquot *dqp); +void xfs_qm_adjust_dqtimers(struct xfs_dquot *d); +void xfs_qm_adjust_dqlimits(struct xfs_dquot *d); +xfs_dqid_t xfs_qm_id_for_quotatype(struct xfs_inode *ip, + xfs_dqtype_t type); +int xfs_qm_dqget(struct xfs_mount *mp, xfs_dqid_t id, + xfs_dqtype_t type, bool can_alloc, + struct xfs_dquot **dqpp); +int xfs_qm_dqget_inode(struct xfs_inode *ip, xfs_dqtype_t type, + bool can_alloc, struct xfs_dquot **dqpp); +int xfs_qm_dqget_next(struct xfs_mount *mp, xfs_dqid_t id, + xfs_dqtype_t type, struct xfs_dquot **dqpp); +int xfs_qm_dqget_uncached(struct xfs_mount *mp, + xfs_dqid_t id, xfs_dqtype_t type, + struct xfs_dquot **dqpp); +void xfs_qm_dqput(struct xfs_dquot *dqp); + +void xfs_dqlock2(struct xfs_dquot *, struct xfs_dquot *); + +void xfs_dquot_set_prealloc_limits(struct xfs_dquot *); + +static inline struct xfs_dquot *xfs_qm_dqhold(struct xfs_dquot *dqp) +{ + xfs_dqlock(dqp); + dqp->q_nrefs++; + xfs_dqunlock(dqp); + return dqp; +} + +typedef int (*xfs_qm_dqiterate_fn)(struct xfs_dquot *dq, + xfs_dqtype_t type, void *priv); +int xfs_qm_dqiterate(struct xfs_mount *mp, xfs_dqtype_t type, + xfs_qm_dqiterate_fn iter_fn, void *priv); + +time64_t xfs_dquot_set_timeout(struct xfs_mount *mp, time64_t timeout); +time64_t xfs_dquot_set_grace_period(time64_t grace); + +#endif /* __XFS_DQUOT_H__ */ |