forked from mirrors/linux
1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
327 lines
12 KiB
C
327 lines
12 KiB
C
/*
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* Copyright (c) 1982, 1986 Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Robert Elz at The University of Melbourne.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* Version: $Id: quota.h,v 2.0 1996/11/17 16:48:14 mvw Exp mvw $
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*/
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#ifndef _LINUX_QUOTA_
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#define _LINUX_QUOTA_
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#include <linux/errno.h>
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#include <linux/types.h>
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#include <linux/spinlock.h>
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#define __DQUOT_VERSION__ "dquot_6.5.1"
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#define __DQUOT_NUM_VERSION__ 6*10000+5*100+1
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typedef __kernel_uid32_t qid_t; /* Type in which we store ids in memory */
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typedef __u64 qsize_t; /* Type in which we store sizes */
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extern spinlock_t dq_data_lock;
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/* Size of blocks in which are counted size limits */
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#define QUOTABLOCK_BITS 10
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#define QUOTABLOCK_SIZE (1 << QUOTABLOCK_BITS)
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/* Conversion routines from and to quota blocks */
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#define qb2kb(x) ((x) << (QUOTABLOCK_BITS-10))
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#define kb2qb(x) ((x) >> (QUOTABLOCK_BITS-10))
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#define toqb(x) (((x) + QUOTABLOCK_SIZE - 1) >> QUOTABLOCK_BITS)
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#define MAXQUOTAS 2
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#define USRQUOTA 0 /* element used for user quotas */
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#define GRPQUOTA 1 /* element used for group quotas */
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/*
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* Definitions for the default names of the quotas files.
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*/
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#define INITQFNAMES { \
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"user", /* USRQUOTA */ \
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"group", /* GRPQUOTA */ \
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"undefined", \
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};
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/*
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* Command definitions for the 'quotactl' system call.
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* The commands are broken into a main command defined below
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* and a subcommand that is used to convey the type of
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* quota that is being manipulated (see above).
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*/
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#define SUBCMDMASK 0x00ff
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#define SUBCMDSHIFT 8
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#define QCMD(cmd, type) (((cmd) << SUBCMDSHIFT) | ((type) & SUBCMDMASK))
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#define Q_SYNC 0x800001 /* sync disk copy of a filesystems quotas */
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#define Q_QUOTAON 0x800002 /* turn quotas on */
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#define Q_QUOTAOFF 0x800003 /* turn quotas off */
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#define Q_GETFMT 0x800004 /* get quota format used on given filesystem */
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#define Q_GETINFO 0x800005 /* get information about quota files */
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#define Q_SETINFO 0x800006 /* set information about quota files */
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#define Q_GETQUOTA 0x800007 /* get user quota structure */
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#define Q_SETQUOTA 0x800008 /* set user quota structure */
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/*
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* Quota structure used for communication with userspace via quotactl
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* Following flags are used to specify which fields are valid
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*/
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#define QIF_BLIMITS 1
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#define QIF_SPACE 2
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#define QIF_ILIMITS 4
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#define QIF_INODES 8
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#define QIF_BTIME 16
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#define QIF_ITIME 32
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#define QIF_LIMITS (QIF_BLIMITS | QIF_ILIMITS)
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#define QIF_USAGE (QIF_SPACE | QIF_INODES)
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#define QIF_TIMES (QIF_BTIME | QIF_ITIME)
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#define QIF_ALL (QIF_LIMITS | QIF_USAGE | QIF_TIMES)
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struct if_dqblk {
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__u64 dqb_bhardlimit;
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__u64 dqb_bsoftlimit;
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__u64 dqb_curspace;
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__u64 dqb_ihardlimit;
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__u64 dqb_isoftlimit;
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__u64 dqb_curinodes;
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__u64 dqb_btime;
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__u64 dqb_itime;
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__u32 dqb_valid;
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};
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/*
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* Structure used for setting quota information about file via quotactl
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* Following flags are used to specify which fields are valid
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*/
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#define IIF_BGRACE 1
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#define IIF_IGRACE 2
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#define IIF_FLAGS 4
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#define IIF_ALL (IIF_BGRACE | IIF_IGRACE | IIF_FLAGS)
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struct if_dqinfo {
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__u64 dqi_bgrace;
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__u64 dqi_igrace;
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__u32 dqi_flags;
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__u32 dqi_valid;
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};
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#ifdef __KERNEL__
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#include <linux/dqblk_xfs.h>
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#include <linux/dqblk_v1.h>
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#include <linux/dqblk_v2.h>
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/* Maximal numbers of writes for quota operation (insert/delete/update)
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* (over all formats) - info block, 4 pointer blocks, data block */
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#define DQUOT_MAX_WRITES 6
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/*
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* Data for one user/group kept in memory
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*/
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struct mem_dqblk {
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__u32 dqb_bhardlimit; /* absolute limit on disk blks alloc */
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__u32 dqb_bsoftlimit; /* preferred limit on disk blks */
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qsize_t dqb_curspace; /* current used space */
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__u32 dqb_ihardlimit; /* absolute limit on allocated inodes */
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__u32 dqb_isoftlimit; /* preferred inode limit */
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__u32 dqb_curinodes; /* current # allocated inodes */
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time_t dqb_btime; /* time limit for excessive disk use */
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time_t dqb_itime; /* time limit for excessive inode use */
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};
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/*
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* Data for one quotafile kept in memory
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*/
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struct quota_format_type;
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struct mem_dqinfo {
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struct quota_format_type *dqi_format;
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struct list_head dqi_dirty_list; /* List of dirty dquots */
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unsigned long dqi_flags;
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unsigned int dqi_bgrace;
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unsigned int dqi_igrace;
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union {
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struct v1_mem_dqinfo v1_i;
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struct v2_mem_dqinfo v2_i;
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} u;
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};
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struct super_block;
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#define DQF_MASK 0xffff /* Mask for format specific flags */
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#define DQF_INFO_DIRTY_B 16
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#define DQF_INFO_DIRTY (1 << DQF_INFO_DIRTY_B) /* Is info dirty? */
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extern void mark_info_dirty(struct super_block *sb, int type);
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#define info_dirty(info) test_bit(DQF_INFO_DIRTY_B, &(info)->dqi_flags)
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#define info_any_dquot_dirty(info) (!list_empty(&(info)->dqi_dirty_list))
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#define info_any_dirty(info) (info_dirty(info) || info_any_dquot_dirty(info))
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#define sb_dqopt(sb) (&(sb)->s_dquot)
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#define sb_dqinfo(sb, type) (sb_dqopt(sb)->info+(type))
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struct dqstats {
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int lookups;
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int drops;
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int reads;
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int writes;
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int cache_hits;
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int allocated_dquots;
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int free_dquots;
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int syncs;
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};
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extern struct dqstats dqstats;
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#define DQ_MOD_B 0 /* dquot modified since read */
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#define DQ_BLKS_B 1 /* uid/gid has been warned about blk limit */
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#define DQ_INODES_B 2 /* uid/gid has been warned about inode limit */
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#define DQ_FAKE_B 3 /* no limits only usage */
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#define DQ_READ_B 4 /* dquot was read into memory */
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#define DQ_ACTIVE_B 5 /* dquot is active (dquot_release not called) */
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#define DQ_WAITFREE_B 6 /* dquot being waited (by invalidate_dquots) */
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struct dquot {
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struct hlist_node dq_hash; /* Hash list in memory */
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struct list_head dq_inuse; /* List of all quotas */
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struct list_head dq_free; /* Free list element */
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struct list_head dq_dirty; /* List of dirty dquots */
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struct semaphore dq_lock; /* dquot IO lock */
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atomic_t dq_count; /* Use count */
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wait_queue_head_t dq_wait_unused; /* Wait queue for dquot to become unused */
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struct super_block *dq_sb; /* superblock this applies to */
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unsigned int dq_id; /* ID this applies to (uid, gid) */
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loff_t dq_off; /* Offset of dquot on disk */
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unsigned long dq_flags; /* See DQ_* */
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short dq_type; /* Type of quota */
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struct mem_dqblk dq_dqb; /* Diskquota usage */
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};
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#define NODQUOT (struct dquot *)NULL
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#define QUOTA_OK 0
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#define NO_QUOTA 1
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/* Operations which must be implemented by each quota format */
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struct quota_format_ops {
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int (*check_quota_file)(struct super_block *sb, int type); /* Detect whether file is in our format */
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int (*read_file_info)(struct super_block *sb, int type); /* Read main info about file - called on quotaon() */
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int (*write_file_info)(struct super_block *sb, int type); /* Write main info about file */
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int (*free_file_info)(struct super_block *sb, int type); /* Called on quotaoff() */
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int (*read_dqblk)(struct dquot *dquot); /* Read structure for one user */
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int (*commit_dqblk)(struct dquot *dquot); /* Write structure for one user */
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int (*release_dqblk)(struct dquot *dquot); /* Called when last reference to dquot is being dropped */
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};
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/* Operations working with dquots */
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struct dquot_operations {
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int (*initialize) (struct inode *, int);
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int (*drop) (struct inode *);
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int (*alloc_space) (struct inode *, qsize_t, int);
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int (*alloc_inode) (const struct inode *, unsigned long);
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int (*free_space) (struct inode *, qsize_t);
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int (*free_inode) (const struct inode *, unsigned long);
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int (*transfer) (struct inode *, struct iattr *);
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int (*write_dquot) (struct dquot *); /* Ordinary dquot write */
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int (*acquire_dquot) (struct dquot *); /* Quota is going to be created on disk */
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int (*release_dquot) (struct dquot *); /* Quota is going to be deleted from disk */
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int (*mark_dirty) (struct dquot *); /* Dquot is marked dirty */
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int (*write_info) (struct super_block *, int); /* Write of quota "superblock" */
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};
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/* Operations handling requests from userspace */
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struct quotactl_ops {
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int (*quota_on)(struct super_block *, int, int, char *);
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int (*quota_off)(struct super_block *, int);
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int (*quota_sync)(struct super_block *, int);
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int (*get_info)(struct super_block *, int, struct if_dqinfo *);
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int (*set_info)(struct super_block *, int, struct if_dqinfo *);
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int (*get_dqblk)(struct super_block *, int, qid_t, struct if_dqblk *);
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int (*set_dqblk)(struct super_block *, int, qid_t, struct if_dqblk *);
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int (*get_xstate)(struct super_block *, struct fs_quota_stat *);
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int (*set_xstate)(struct super_block *, unsigned int, int);
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int (*get_xquota)(struct super_block *, int, qid_t, struct fs_disk_quota *);
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int (*set_xquota)(struct super_block *, int, qid_t, struct fs_disk_quota *);
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};
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struct quota_format_type {
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int qf_fmt_id; /* Quota format id */
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struct quota_format_ops *qf_ops; /* Operations of format */
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struct module *qf_owner; /* Module implementing quota format */
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struct quota_format_type *qf_next;
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};
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#define DQUOT_USR_ENABLED 0x01 /* User diskquotas enabled */
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#define DQUOT_GRP_ENABLED 0x02 /* Group diskquotas enabled */
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struct quota_info {
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unsigned int flags; /* Flags for diskquotas on this device */
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struct semaphore dqio_sem; /* lock device while I/O in progress */
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struct semaphore dqonoff_sem; /* Serialize quotaon & quotaoff */
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struct rw_semaphore dqptr_sem; /* serialize ops using quota_info struct, pointers from inode to dquots */
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struct inode *files[MAXQUOTAS]; /* inodes of quotafiles */
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struct vfsmount *mnt[MAXQUOTAS]; /* mountpoint entries of filesystems with quota files */
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struct mem_dqinfo info[MAXQUOTAS]; /* Information for each quota type */
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struct quota_format_ops *ops[MAXQUOTAS]; /* Operations for each type */
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};
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/* Inline would be better but we need to dereference super_block which is not defined yet */
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int mark_dquot_dirty(struct dquot *dquot);
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#define dquot_dirty(dquot) test_bit(DQ_MOD_B, &(dquot)->dq_flags)
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#define sb_has_quota_enabled(sb, type) ((type)==USRQUOTA ? \
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(sb_dqopt(sb)->flags & DQUOT_USR_ENABLED) : (sb_dqopt(sb)->flags & DQUOT_GRP_ENABLED))
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#define sb_any_quota_enabled(sb) (sb_has_quota_enabled(sb, USRQUOTA) | \
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sb_has_quota_enabled(sb, GRPQUOTA))
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int register_quota_format(struct quota_format_type *fmt);
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void unregister_quota_format(struct quota_format_type *fmt);
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struct quota_module_name {
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int qm_fmt_id;
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char *qm_mod_name;
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};
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#define INIT_QUOTA_MODULE_NAMES {\
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{QFMT_VFS_OLD, "quota_v1"},\
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{QFMT_VFS_V0, "quota_v2"},\
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{0, NULL}}
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#else
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# /* nodep */ include <sys/cdefs.h>
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__BEGIN_DECLS
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long quotactl __P ((unsigned int, const char *, int, caddr_t));
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__END_DECLS
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#endif /* __KERNEL__ */
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#endif /* _QUOTA_ */
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