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Diffstat (limited to 'include/linux/quota.h')
| -rw-r--r-- | include/linux/quota.h | 327 |
1 files changed, 327 insertions, 0 deletions
diff --git a/include/linux/quota.h b/include/linux/quota.h new file mode 100644 index 0000000..ac5b90f --- /dev/null +++ b/include/linux/quota.h @@ -0,0 +1,327 @@ +/* + * Copyright (c) 1982, 1986 Regents of the University of California. + * All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * Robert Elz at The University of Melbourne. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * Version: $Id: quota.h,v 2.0 1996/11/17 16:48:14 mvw Exp mvw $ + */ + +#ifndef _LINUX_QUOTA_ +#define _LINUX_QUOTA_ + +#include <linux/errno.h> +#include <linux/types.h> +#include <linux/spinlock.h> + +#define __DQUOT_VERSION__ "dquot_6.5.1" +#define __DQUOT_NUM_VERSION__ 6*10000+5*100+1 + +typedef __kernel_uid32_t qid_t; /* Type in which we store ids in memory */ +typedef __u64 qsize_t; /* Type in which we store sizes */ + +extern spinlock_t dq_data_lock; + +/* Size of blocks in which are counted size limits */ +#define QUOTABLOCK_BITS 10 +#define QUOTABLOCK_SIZE (1 << QUOTABLOCK_BITS) + +/* Conversion routines from and to quota blocks */ +#define qb2kb(x) ((x) << (QUOTABLOCK_BITS-10)) +#define kb2qb(x) ((x) >> (QUOTABLOCK_BITS-10)) +#define toqb(x) (((x) + QUOTABLOCK_SIZE - 1) >> QUOTABLOCK_BITS) + +#define MAXQUOTAS 2 +#define USRQUOTA 0 /* element used for user quotas */ +#define GRPQUOTA 1 /* element used for group quotas */ + +/* + * Definitions for the default names of the quotas files. + */ +#define INITQFNAMES { \ + "user", /* USRQUOTA */ \ + "group", /* GRPQUOTA */ \ + "undefined", \ +}; + +/* + * Command definitions for the 'quotactl' system call. + * The commands are broken into a main command defined below + * and a subcommand that is used to convey the type of + * quota that is being manipulated (see above). + */ +#define SUBCMDMASK 0x00ff +#define SUBCMDSHIFT 8 +#define QCMD(cmd, type) (((cmd) << SUBCMDSHIFT) | ((type) & SUBCMDMASK)) + +#define Q_SYNC 0x800001 /* sync disk copy of a filesystems quotas */ +#define Q_QUOTAON 0x800002 /* turn quotas on */ +#define Q_QUOTAOFF 0x800003 /* turn quotas off */ +#define Q_GETFMT 0x800004 /* get quota format used on given filesystem */ +#define Q_GETINFO 0x800005 /* get information about quota files */ +#define Q_SETINFO 0x800006 /* set information about quota files */ +#define Q_GETQUOTA 0x800007 /* get user quota structure */ +#define Q_SETQUOTA 0x800008 /* set user quota structure */ + +/* + * Quota structure used for communication with userspace via quotactl + * Following flags are used to specify which fields are valid + */ +#define QIF_BLIMITS 1 +#define QIF_SPACE 2 +#define QIF_ILIMITS 4 +#define QIF_INODES 8 +#define QIF_BTIME 16 +#define QIF_ITIME 32 +#define QIF_LIMITS (QIF_BLIMITS | QIF_ILIMITS) +#define QIF_USAGE (QIF_SPACE | QIF_INODES) +#define QIF_TIMES (QIF_BTIME | QIF_ITIME) +#define QIF_ALL (QIF_LIMITS | QIF_USAGE | QIF_TIMES) + +struct if_dqblk { + __u64 dqb_bhardlimit; + __u64 dqb_bsoftlimit; + __u64 dqb_curspace; + __u64 dqb_ihardlimit; + __u64 dqb_isoftlimit; + __u64 dqb_curinodes; + __u64 dqb_btime; + __u64 dqb_itime; + __u32 dqb_valid; +}; + +/* + * Structure used for setting quota information about file via quotactl + * Following flags are used to specify which fields are valid + */ +#define IIF_BGRACE 1 +#define IIF_IGRACE 2 +#define IIF_FLAGS 4 +#define IIF_ALL (IIF_BGRACE | IIF_IGRACE | IIF_FLAGS) + +struct if_dqinfo { + __u64 dqi_bgrace; + __u64 dqi_igrace; + __u32 dqi_flags; + __u32 dqi_valid; +}; + +#ifdef __KERNEL__ + +#include <linux/dqblk_xfs.h> +#include <linux/dqblk_v1.h> +#include <linux/dqblk_v2.h> + +/* Maximal numbers of writes for quota operation (insert/delete/update) + * (over all formats) - info block, 4 pointer blocks, data block */ +#define DQUOT_MAX_WRITES 6 + +/* + * Data for one user/group kept in memory + */ +struct mem_dqblk { + __u32 dqb_bhardlimit; /* absolute limit on disk blks alloc */ + __u32 dqb_bsoftlimit; /* preferred limit on disk blks */ + qsize_t dqb_curspace; /* current used space */ + __u32 dqb_ihardlimit; /* absolute limit on allocated inodes */ + __u32 dqb_isoftlimit; /* preferred inode limit */ + __u32 dqb_curinodes; /* current # allocated inodes */ + time_t dqb_btime; /* time limit for excessive disk use */ + time_t dqb_itime; /* time limit for excessive inode use */ +}; + +/* + * Data for one quotafile kept in memory + */ +struct quota_format_type; + +struct mem_dqinfo { + struct quota_format_type *dqi_format; + struct list_head dqi_dirty_list; /* List of dirty dquots */ + unsigned long dqi_flags; + unsigned int dqi_bgrace; + unsigned int dqi_igrace; + union { + struct v1_mem_dqinfo v1_i; + struct v2_mem_dqinfo v2_i; + } u; +}; + +struct super_block; + +#define DQF_MASK 0xffff /* Mask for format specific flags */ +#define DQF_INFO_DIRTY_B 16 +#define DQF_INFO_DIRTY (1 << DQF_INFO_DIRTY_B) /* Is info dirty? */ + +extern void mark_info_dirty(struct super_block *sb, int type); +#define info_dirty(info) test_bit(DQF_INFO_DIRTY_B, &(info)->dqi_flags) +#define info_any_dquot_dirty(info) (!list_empty(&(info)->dqi_dirty_list)) +#define info_any_dirty(info) (info_dirty(info) || info_any_dquot_dirty(info)) + +#define sb_dqopt(sb) (&(sb)->s_dquot) +#define sb_dqinfo(sb, type) (sb_dqopt(sb)->info+(type)) + +struct dqstats { + int lookups; + int drops; + int reads; + int writes; + int cache_hits; + int allocated_dquots; + int free_dquots; + int syncs; +}; + +extern struct dqstats dqstats; + +#define DQ_MOD_B 0 /* dquot modified since read */ +#define DQ_BLKS_B 1 /* uid/gid has been warned about blk limit */ +#define DQ_INODES_B 2 /* uid/gid has been warned about inode limit */ +#define DQ_FAKE_B 3 /* no limits only usage */ +#define DQ_READ_B 4 /* dquot was read into memory */ +#define DQ_ACTIVE_B 5 /* dquot is active (dquot_release not called) */ +#define DQ_WAITFREE_B 6 /* dquot being waited (by invalidate_dquots) */ + +struct dquot { + struct hlist_node dq_hash; /* Hash list in memory */ + struct list_head dq_inuse; /* List of all quotas */ + struct list_head dq_free; /* Free list element */ + struct list_head dq_dirty; /* List of dirty dquots */ + struct semaphore dq_lock; /* dquot IO lock */ + atomic_t dq_count; /* Use count */ + wait_queue_head_t dq_wait_unused; /* Wait queue for dquot to become unused */ + struct super_block *dq_sb; /* superblock this applies to */ + unsigned int dq_id; /* ID this applies to (uid, gid) */ + loff_t dq_off; /* Offset of dquot on disk */ + unsigned long dq_flags; /* See DQ_* */ + short dq_type; /* Type of quota */ + struct mem_dqblk dq_dqb; /* Diskquota usage */ +}; + +#define NODQUOT (struct dquot *)NULL + +#define QUOTA_OK 0 +#define NO_QUOTA 1 + +/* Operations which must be implemented by each quota format */ +struct quota_format_ops { + int (*check_quota_file)(struct super_block *sb, int type); /* Detect whether file is in our format */ + int (*read_file_info)(struct super_block *sb, int type); /* Read main info about file - called on quotaon() */ + int (*write_file_info)(struct super_block *sb, int type); /* Write main info about file */ + int (*free_file_info)(struct super_block *sb, int type); /* Called on quotaoff() */ + int (*read_dqblk)(struct dquot *dquot); /* Read structure for one user */ + int (*commit_dqblk)(struct dquot *dquot); /* Write structure for one user */ + int (*release_dqblk)(struct dquot *dquot); /* Called when last reference to dquot is being dropped */ +}; + +/* Operations working with dquots */ +struct dquot_operations { + int (*initialize) (struct inode *, int); + int (*drop) (struct inode *); + int (*alloc_space) (struct inode *, qsize_t, int); + int (*alloc_inode) (const struct inode *, unsigned long); + int (*free_space) (struct inode *, qsize_t); + int (*free_inode) (const struct inode *, unsigned long); + int (*transfer) (struct inode *, struct iattr *); + int (*write_dquot) (struct dquot *); /* Ordinary dquot write */ + int (*acquire_dquot) (struct dquot *); /* Quota is going to be created on disk */ + int (*release_dquot) (struct dquot *); /* Quota is going to be deleted from disk */ + int (*mark_dirty) (struct dquot *); /* Dquot is marked dirty */ + int (*write_info) (struct super_block *, int); /* Write of quota "superblock" */ +}; + +/* Operations handling requests from userspace */ +struct quotactl_ops { + int (*quota_on)(struct super_block *, int, int, char *); + int (*quota_off)(struct super_block *, int); + int (*quota_sync)(struct super_block *, int); + int (*get_info)(struct super_block *, int, struct if_dqinfo *); + int (*set_info)(struct super_block *, int, struct if_dqinfo *); + int (*get_dqblk)(struct super_block *, int, qid_t, struct if_dqblk *); + int (*set_dqblk)(struct super_block *, int, qid_t, struct if_dqblk *); + int (*get_xstate)(struct super_block *, struct fs_quota_stat *); + int (*set_xstate)(struct super_block *, unsigned int, int); + int (*get_xquota)(struct super_block *, int, qid_t, struct fs_disk_quota *); + int (*set_xquota)(struct super_block *, int, qid_t, struct fs_disk_quota *); +}; + +struct quota_format_type { + int qf_fmt_id; /* Quota format id */ + struct quota_format_ops *qf_ops; /* Operations of format */ + struct module *qf_owner; /* Module implementing quota format */ + struct quota_format_type *qf_next; +}; + +#define DQUOT_USR_ENABLED 0x01 /* User diskquotas enabled */ +#define DQUOT_GRP_ENABLED 0x02 /* Group diskquotas enabled */ + +struct quota_info { + unsigned int flags; /* Flags for diskquotas on this device */ + struct semaphore dqio_sem; /* lock device while I/O in progress */ + struct semaphore dqonoff_sem; /* Serialize quotaon & quotaoff */ + struct rw_semaphore dqptr_sem; /* serialize ops using quota_info struct, pointers from inode to dquots */ + struct inode *files[MAXQUOTAS]; /* inodes of quotafiles */ + struct vfsmount *mnt[MAXQUOTAS]; /* mountpoint entries of filesystems with quota files */ + struct mem_dqinfo info[MAXQUOTAS]; /* Information for each quota type */ + struct quota_format_ops *ops[MAXQUOTAS]; /* Operations for each type */ +}; + +/* Inline would be better but we need to dereference super_block which is not defined yet */ +int mark_dquot_dirty(struct dquot *dquot); + +#define dquot_dirty(dquot) test_bit(DQ_MOD_B, &(dquot)->dq_flags) + +#define sb_has_quota_enabled(sb, type) ((type)==USRQUOTA ? \ + (sb_dqopt(sb)->flags & DQUOT_USR_ENABLED) : (sb_dqopt(sb)->flags & DQUOT_GRP_ENABLED)) + +#define sb_any_quota_enabled(sb) (sb_has_quota_enabled(sb, USRQUOTA) | \ + sb_has_quota_enabled(sb, GRPQUOTA)) + +int register_quota_format(struct quota_format_type *fmt); +void unregister_quota_format(struct quota_format_type *fmt); + +struct quota_module_name { + int qm_fmt_id; + char *qm_mod_name; +}; + +#define INIT_QUOTA_MODULE_NAMES {\ + {QFMT_VFS_OLD, "quota_v1"},\ + {QFMT_VFS_V0, "quota_v2"},\ + {0, NULL}} + +#else + +# /* nodep */ include <sys/cdefs.h> + +__BEGIN_DECLS +long quotactl __P ((unsigned int, const char *, int, caddr_t)); +__END_DECLS + +#endif /* __KERNEL__ */ +#endif /* _QUOTA_ */ |
