summaryrefslogtreecommitdiff
path: root/fs/xfs/xfs_dquot.h
diff options
context:
space:
mode:
authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /fs/xfs/xfs_dquot.h
Initial import
Diffstat (limited to 'fs/xfs/xfs_dquot.h')
-rw-r--r--fs/xfs/xfs_dquot.h188
1 files changed, 188 insertions, 0 deletions
diff --git a/fs/xfs/xfs_dquot.h b/fs/xfs/xfs_dquot.h
new file mode 100644
index 000000000..2f536f33c
--- /dev/null
+++ b/fs/xfs/xfs_dquot.h
@@ -0,0 +1,188 @@
+/*
+ * Copyright (c) 2000-2005 Silicon Graphics, Inc.
+ * All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+#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
+};
+
+/*
+ * The incore dquot structure
+ */
+typedef struct xfs_dquot {
+ uint dq_flags; /* various flags (XFS_DQ_*) */
+ struct list_head q_lru; /* global free list of dquots */
+ struct xfs_mount*q_mount; /* filesystem this relates to */
+ struct xfs_trans*q_transp; /* trans this belongs to currently */
+ uint q_nrefs; /* # active refs from inodes */
+ xfs_daddr_t q_blkno; /* blkno of dquot buffer */
+ int q_bufoffset; /* off of dq in buffer (# dquots) */
+ xfs_fileoff_t q_fileoffset; /* offset in quotas file */
+
+ xfs_disk_dquot_t q_core; /* actual usage & quotas */
+ xfs_dq_logitem_t q_logitem; /* dquot log item */
+ xfs_qcnt_t q_res_bcount; /* total regular nblks used+reserved */
+ xfs_qcnt_t q_res_icount; /* total inos allocd+reserved */
+ xfs_qcnt_t q_res_rtbcount;/* total realtime blks used+reserved */
+ xfs_qcnt_t q_prealloc_lo_wmark;/* prealloc throttle wmark */
+ xfs_qcnt_t q_prealloc_hi_wmark;/* prealloc disabled wmark */
+ int64_t q_low_space[XFS_QLOWSP_MAX];
+ struct mutex q_qlock; /* quota lock */
+ struct completion q_flush; /* flush completion queue */
+ atomic_t q_pincount; /* dquot pin count */
+ wait_queue_head_t q_pinwait; /* dquot pinning wait queue */
+} xfs_dquot_t;
+
+/*
+ * 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(xfs_dquot_t *dqp)
+{
+ wait_for_completion(&dqp->q_flush);
+}
+
+static inline bool xfs_dqflock_nowait(xfs_dquot_t *dqp)
+{
+ return try_wait_for_completion(&dqp->q_flush);
+}
+
+static inline void xfs_dqfunlock(xfs_dquot_t *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_this_quota_on(struct xfs_mount *mp, int type)
+{
+ switch (type & XFS_DQ_ALLTYPES) {
+ case XFS_DQ_USER:
+ return XFS_IS_UQUOTA_ON(mp);
+ case XFS_DQ_GROUP:
+ return XFS_IS_GQUOTA_ON(mp);
+ case XFS_DQ_PROJ:
+ return XFS_IS_PQUOTA_ON(mp);
+ default:
+ return 0;
+ }
+}
+
+static inline xfs_dquot_t *xfs_inode_dquot(struct xfs_inode *ip, int type)
+{
+ switch (type & XFS_DQ_ALLTYPES) {
+ case XFS_DQ_USER:
+ return ip->i_udquot;
+ case XFS_DQ_GROUP:
+ return ip->i_gdquot;
+ case XFS_DQ_PROJ:
+ return ip->i_pdquot;
+ default:
+ return NULL;
+ }
+}
+
+/*
+ * 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 = be64_to_cpu(dqp->q_core.d_blk_hardlimit) - dqp->q_res_bcount;
+ if (freesp < dqp->q_low_space[XFS_QLOWSP_1_PCNT])
+ return true;
+
+ return false;
+}
+
+#define XFS_DQ_IS_LOCKED(dqp) (mutex_is_locked(&((dqp)->q_qlock)))
+#define XFS_DQ_IS_DIRTY(dqp) ((dqp)->dq_flags & XFS_DQ_DIRTY)
+#define XFS_QM_ISUDQ(dqp) ((dqp)->dq_flags & XFS_DQ_USER)
+#define XFS_QM_ISPDQ(dqp) ((dqp)->dq_flags & XFS_DQ_PROJ)
+#define XFS_QM_ISGDQ(dqp) ((dqp)->dq_flags & XFS_DQ_GROUP)
+
+extern int xfs_qm_dqread(struct xfs_mount *, xfs_dqid_t, uint,
+ uint, struct xfs_dquot **);
+extern void xfs_qm_dqdestroy(xfs_dquot_t *);
+extern int xfs_qm_dqflush(struct xfs_dquot *, struct xfs_buf **);
+extern void xfs_qm_dqunpin_wait(xfs_dquot_t *);
+extern void xfs_qm_adjust_dqtimers(xfs_mount_t *,
+ xfs_disk_dquot_t *);
+extern void xfs_qm_adjust_dqlimits(struct xfs_mount *,
+ struct xfs_dquot *);
+extern int xfs_qm_dqget(xfs_mount_t *, xfs_inode_t *,
+ xfs_dqid_t, uint, uint, xfs_dquot_t **);
+extern void xfs_qm_dqput(xfs_dquot_t *);
+
+extern void xfs_dqlock2(struct xfs_dquot *, struct xfs_dquot *);
+
+extern 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;
+}
+
+#endif /* __XFS_DQUOT_H__ */