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Linux/fs/xfs/xfs_dquot.h

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  * Copyright (c) 2000-2005 Silicon Graphics, Inc.
  4  * All Rights Reserved.
  5  */
  6 #ifndef __XFS_DQUOT_H__
  7 #define __XFS_DQUOT_H__
  8 
  9 /*
 10  * Dquots are structures that hold quota information about a user or a group,
 11  * much like inodes are for files. In fact, dquots share many characteristics
 12  * with inodes. However, dquots can also be a centralized resource, relative
 13  * to a collection of inodes. In this respect, dquots share some characteristics
 14  * of the superblock.
 15  * XFS dquots exploit both those in its algorithms. They make every attempt
 16  * to not be a bottleneck when quotas are on and have minimal impact, if any,
 17  * when quotas are off.
 18  */
 19 
 20 struct xfs_mount;
 21 struct xfs_trans;
 22 
 23 enum {
 24         XFS_QLOWSP_1_PCNT = 0,
 25         XFS_QLOWSP_3_PCNT,
 26         XFS_QLOWSP_5_PCNT,
 27         XFS_QLOWSP_MAX
 28 };
 29 
 30 /*
 31  * The incore dquot structure
 32  */
 33 typedef struct xfs_dquot {
 34         uint             dq_flags;      /* various flags (XFS_DQ_*) */
 35         struct list_head q_lru;         /* global free list of dquots */
 36         struct xfs_mount*q_mount;       /* filesystem this relates to */
 37         uint             q_nrefs;       /* # active refs from inodes */
 38         xfs_daddr_t      q_blkno;       /* blkno of dquot buffer */
 39         int              q_bufoffset;   /* off of dq in buffer (# dquots) */
 40         xfs_fileoff_t    q_fileoffset;  /* offset in quotas file */
 41 
 42         xfs_disk_dquot_t q_core;        /* actual usage & quotas */
 43         xfs_dq_logitem_t q_logitem;     /* dquot log item */
 44         xfs_qcnt_t       q_res_bcount;  /* total regular nblks used+reserved */
 45         xfs_qcnt_t       q_res_icount;  /* total inos allocd+reserved */
 46         xfs_qcnt_t       q_res_rtbcount;/* total realtime blks used+reserved */
 47         xfs_qcnt_t       q_prealloc_lo_wmark;/* prealloc throttle wmark */
 48         xfs_qcnt_t       q_prealloc_hi_wmark;/* prealloc disabled wmark */
 49         int64_t          q_low_space[XFS_QLOWSP_MAX];
 50         struct mutex     q_qlock;       /* quota lock */
 51         struct completion q_flush;      /* flush completion queue */
 52         atomic_t          q_pincount;   /* dquot pin count */
 53         wait_queue_head_t q_pinwait;    /* dquot pinning wait queue */
 54 } xfs_dquot_t;
 55 
 56 /*
 57  * Lock hierarchy for q_qlock:
 58  *      XFS_QLOCK_NORMAL is the implicit default,
 59  *      XFS_QLOCK_NESTED is the dquot with the higher id in xfs_dqlock2
 60  */
 61 enum {
 62         XFS_QLOCK_NORMAL = 0,
 63         XFS_QLOCK_NESTED,
 64 };
 65 
 66 /*
 67  * Manage the q_flush completion queue embedded in the dquot.  This completion
 68  * queue synchronizes processes attempting to flush the in-core dquot back to
 69  * disk.
 70  */
 71 static inline void xfs_dqflock(xfs_dquot_t *dqp)
 72 {
 73         wait_for_completion(&dqp->q_flush);
 74 }
 75 
 76 static inline bool xfs_dqflock_nowait(xfs_dquot_t *dqp)
 77 {
 78         return try_wait_for_completion(&dqp->q_flush);
 79 }
 80 
 81 static inline void xfs_dqfunlock(xfs_dquot_t *dqp)
 82 {
 83         complete(&dqp->q_flush);
 84 }
 85 
 86 static inline int xfs_dqlock_nowait(struct xfs_dquot *dqp)
 87 {
 88         return mutex_trylock(&dqp->q_qlock);
 89 }
 90 
 91 static inline void xfs_dqlock(struct xfs_dquot *dqp)
 92 {
 93         mutex_lock(&dqp->q_qlock);
 94 }
 95 
 96 static inline void xfs_dqunlock(struct xfs_dquot *dqp)
 97 {
 98         mutex_unlock(&dqp->q_qlock);
 99 }
100 
101 static inline int xfs_this_quota_on(struct xfs_mount *mp, int type)
102 {
103         switch (type & XFS_DQ_ALLTYPES) {
104         case XFS_DQ_USER:
105                 return XFS_IS_UQUOTA_ON(mp);
106         case XFS_DQ_GROUP:
107                 return XFS_IS_GQUOTA_ON(mp);
108         case XFS_DQ_PROJ:
109                 return XFS_IS_PQUOTA_ON(mp);
110         default:
111                 return 0;
112         }
113 }
114 
115 static inline xfs_dquot_t *xfs_inode_dquot(struct xfs_inode *ip, int type)
116 {
117         switch (type & XFS_DQ_ALLTYPES) {
118         case XFS_DQ_USER:
119                 return ip->i_udquot;
120         case XFS_DQ_GROUP:
121                 return ip->i_gdquot;
122         case XFS_DQ_PROJ:
123                 return ip->i_pdquot;
124         default:
125                 return NULL;
126         }
127 }
128 
129 /*
130  * Check whether a dquot is under low free space conditions. We assume the quota
131  * is enabled and enforced.
132  */
133 static inline bool xfs_dquot_lowsp(struct xfs_dquot *dqp)
134 {
135         int64_t freesp;
136 
137         freesp = be64_to_cpu(dqp->q_core.d_blk_hardlimit) - dqp->q_res_bcount;
138         if (freesp < dqp->q_low_space[XFS_QLOWSP_1_PCNT])
139                 return true;
140 
141         return false;
142 }
143 
144 #define XFS_DQ_IS_LOCKED(dqp)   (mutex_is_locked(&((dqp)->q_qlock)))
145 #define XFS_DQ_IS_DIRTY(dqp)    ((dqp)->dq_flags & XFS_DQ_DIRTY)
146 #define XFS_QM_ISUDQ(dqp)       ((dqp)->dq_flags & XFS_DQ_USER)
147 #define XFS_QM_ISPDQ(dqp)       ((dqp)->dq_flags & XFS_DQ_PROJ)
148 #define XFS_QM_ISGDQ(dqp)       ((dqp)->dq_flags & XFS_DQ_GROUP)
149 
150 extern void             xfs_qm_dqdestroy(xfs_dquot_t *);
151 extern int              xfs_qm_dqflush(struct xfs_dquot *, struct xfs_buf **);
152 extern void             xfs_qm_dqunpin_wait(xfs_dquot_t *);
153 extern void             xfs_qm_adjust_dqtimers(xfs_mount_t *,
154                                         xfs_disk_dquot_t *);
155 extern void             xfs_qm_adjust_dqlimits(struct xfs_mount *,
156                                                struct xfs_dquot *);
157 extern xfs_dqid_t       xfs_qm_id_for_quotatype(struct xfs_inode *ip,
158                                         uint type);
159 extern int              xfs_qm_dqget(struct xfs_mount *mp, xfs_dqid_t id,
160                                         uint type, bool can_alloc,
161                                         struct xfs_dquot **dqpp);
162 extern int              xfs_qm_dqget_inode(struct xfs_inode *ip, uint type,
163                                         bool can_alloc,
164                                         struct xfs_dquot **dqpp);
165 extern int              xfs_qm_dqget_next(struct xfs_mount *mp, xfs_dqid_t id,
166                                         uint type, struct xfs_dquot **dqpp);
167 extern int              xfs_qm_dqget_uncached(struct xfs_mount *mp,
168                                         xfs_dqid_t id, uint type,
169                                         struct xfs_dquot **dqpp);
170 extern void             xfs_qm_dqput(xfs_dquot_t *);
171 
172 extern void             xfs_dqlock2(struct xfs_dquot *, struct xfs_dquot *);
173 
174 extern void             xfs_dquot_set_prealloc_limits(struct xfs_dquot *);
175 
176 static inline struct xfs_dquot *xfs_qm_dqhold(struct xfs_dquot *dqp)
177 {
178         xfs_dqlock(dqp);
179         dqp->q_nrefs++;
180         xfs_dqunlock(dqp);
181         return dqp;
182 }
183 
184 typedef int (*xfs_qm_dqiterate_fn)(struct xfs_dquot *dq, uint dqtype,
185                 void *priv);
186 int xfs_qm_dqiterate(struct xfs_mount *mp, uint dqtype,
187                 xfs_qm_dqiterate_fn iter_fn, void *priv);
188 
189 #endif /* __XFS_DQUOT_H__ */
190 

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