[PATCH] [7/13] quota-7-quotactl

This is probably the largest chunk in quota patches. It removes old quotactl interface
and implements new one. New interface should not need arch specific conversions so they
are removed. All quota interface stuff is moved to quota.c so we can
easily separate things which should be compiled even if quota is disabled (mainly
because XFS needs some interface even if standard VFS quota is disabled).
Callbacks to filesystem on quota_on() and quota_off() are implemented (needed by Ext3),
quota operations callbacks are now set in super.c on superblock initialization and
not on quota_on(). This way it starts to make sense to have callbacks on alloc_space(),
alloc_inode() etc. as filesystem can override them on read_super(). This will be used
later for implementing journalled quota.

arch/ia64/ia32/ia32_entry.S

@@ -310,7 +310,7 @@ ia32_syscall_table:
 	data8 sys32_ni_syscall	/* init_module */
 	data8 sys32_ni_syscall	/* delete_module */
 	data8 sys32_ni_syscall	/* get_kernel_syms */  /* 130 */
-	data8 sys32_quotactl
+	data8 sys_quotactl
 	data8 sys_getpgid
 	data8 sys_fchdir
 	data8 sys32_ni_syscall	/* sys_bdflush */

arch/ia64/ia32/sys_ia32.c

@@ -3669,60 +3669,6 @@ getname32 (const char *filename)
 	return result;
 }
 
-struct dqblk32 {
-	__u32 dqb_bhardlimit;
-	__u32 dqb_bsoftlimit;
-	__u32 dqb_curblocks;
-	__u32 dqb_ihardlimit;
-	__u32 dqb_isoftlimit;
-	__u32 dqb_curinodes;
-	__kernel_time_t32 dqb_btime;
-	__kernel_time_t32 dqb_itime;
-};
-
-asmlinkage long
-sys32_quotactl (int cmd, unsigned int special, int id, struct dqblk32 *addr)
-{
-	extern asmlinkage long sys_quotactl (int, const char *, int, caddr_t);
-	int cmds = cmd >> SUBCMDSHIFT;
-	mm_segment_t old_fs;
-	struct dqblk d;
-	char *spec;
-	long err;
-
-	switch (cmds) {
-	      case Q_GETQUOTA:
-		break;
-	      case Q_SETQUOTA:
-	      case Q_SETUSE:
-	      case Q_SETQLIM:
-		if (copy_from_user (&d, addr, sizeof(struct dqblk32)))
-			return -EFAULT;
-		d.dqb_itime = ((struct dqblk32 *)&d)->dqb_itime;
-		d.dqb_btime = ((struct dqblk32 *)&d)->dqb_btime;
-		break;
-	      default:
-		return sys_quotactl(cmd, (void *) A(special), id, (caddr_t) addr);
-	}
-	spec = getname32((void *) A(special));
-	err = PTR_ERR(spec);
-	if (IS_ERR(spec))
-		return err;
-	old_fs = get_fs ();
-	set_fs(KERNEL_DS);
-	err = sys_quotactl(cmd, (const char *)spec, id, (caddr_t)&d);
-	set_fs(old_fs);
-	putname(spec);
-	if (cmds == Q_GETQUOTA) {
-		__kernel_time_t b = d.dqb_btime, i = d.dqb_itime;
-		((struct dqblk32 *)&d)->dqb_itime = i;
-		((struct dqblk32 *)&d)->dqb_btime = b;
-		if (copy_to_user(addr, &d, sizeof(struct dqblk32)))
-			return -EFAULT;
-	}
-	return err;
-}
-
 asmlinkage long
 sys32_sched_rr_get_interval (pid_t pid, struct timespec32 *interval)
 {

arch/s390x/kernel/linux32.c

@@ -897,64 +897,6 @@ asmlinkage long sys32_fcntl64(unsigned int fd, unsigned int cmd, unsigned long a
 	return sys32_fcntl(fd, cmd, arg);
 }
 
-struct mem_dqblk32 {
-    __u32 dqb_ihardlimit;
-    __u32 dqb_isoftlimit;
-    __u32 dqb_curinodes;
-    __u32 dqb_bhardlimit;
-    __u32 dqb_bsoftlimit;
-    __u64 dqb_curspace;
-    __kernel_time_t32 dqb_btime;
-    __kernel_time_t32 dqb_itime;
-};
-                                
-extern asmlinkage long sys_quotactl(int cmd, const char *special, int id, __kernel_caddr_t addr);
-
-asmlinkage int sys32_quotactl(int cmd, const char *special, int id, unsigned long addr)
-{
-	int cmds = cmd >> SUBCMDSHIFT;
-	int err;
-	struct mem_dqblk d;
-	mm_segment_t old_fs;
-	char *spec;
-	
-	switch (cmds) {
-	case Q_GETQUOTA:
-		break;
-	case Q_SETQUOTA:
-	case Q_SETUSE:
-	case Q_SETQLIM:
-		if (copy_from_user (&d, (struct mem_dqblk32 *)addr,
-				    sizeof (struct mem_dqblk32)))
-			return -EFAULT;
-		d.dqb_itime = ((struct mem_dqblk32 *)&d)->dqb_itime;
-		d.dqb_btime = ((struct mem_dqblk32 *)&d)->dqb_btime;
-		break;
-	default:
-		return sys_quotactl(cmd, special,
-				    id, (__kernel_caddr_t)addr);
-	}
-	spec = getname (special);
-	err = PTR_ERR(spec);
-	if (IS_ERR(spec)) return err;
-	old_fs = get_fs ();
-	set_fs (KERNEL_DS);
-	err = sys_quotactl(cmd, (const char *)spec, id, (__kernel_caddr_t)&d);
-	set_fs (old_fs);
-	putname (spec);
-	if (err)
-		return err;
-	if (cmds == Q_GETQUOTA) {
-		__kernel_time_t b = d.dqb_btime, i = d.dqb_itime;
-		((struct mem_dqblk32 *)&d)->dqb_itime = i;
-		((struct mem_dqblk32 *)&d)->dqb_btime = b;
-		if (copy_to_user ((struct mem_dqblk32 *)addr, &d,
-				  sizeof (struct mem_dqblk32)))
-			return -EFAULT;
-	}
-	return 0;
-}
-
 static inline int put_statfs (struct statfs32 *ubuf, struct statfs *kbuf)
 {
 	int err;

arch/s390x/kernel/wrapper32.S

@@ -586,7 +586,7 @@ sys32_quotactl_wrapper:
 	llgtr	%r3,%r3			# const char *
 	lgfr	%r4,%r4			# int
 	llgtr	%r5,%r5			# caddr_t
-	jg	sys32_quotactl		# branch to system call
+	jg	sys_quotactl		# branch to system call
 
 	.globl  sys32_getpgid_wrapper 
 sys32_getpgid_wrapper:

arch/sparc64/kernel/sys_sparc32.c

@@ -889,62 +889,6 @@ asmlinkage long sys32_fcntl64(unsigned int fd, unsigned int cmd, unsigned long a
 	return sys32_fcntl(fd, cmd, arg);
 }
 
-struct dqblk32 {
-    __u32 dqb_bhardlimit;
-    __u32 dqb_bsoftlimit;
-    __u32 dqb_curblocks;
-    __u32 dqb_ihardlimit;
-    __u32 dqb_isoftlimit;
-    __u32 dqb_curinodes;
-    __kernel_time_t32 dqb_btime;
-    __kernel_time_t32 dqb_itime;
-};
-                                
-extern asmlinkage int sys_quotactl(int cmd, const char *special, int id, caddr_t addr);
-
-asmlinkage int sys32_quotactl(int cmd, const char *special, int id, unsigned long addr)
-{
-	int cmds = cmd >> SUBCMDSHIFT;
-	int err;
-	struct dqblk d;
-	mm_segment_t old_fs;
-	char *spec;
-	
-	switch (cmds) {
-	case Q_GETQUOTA:
-		break;
-	case Q_SETQUOTA:
-	case Q_SETUSE:
-	case Q_SETQLIM:
-		if (copy_from_user (&d, (struct dqblk32 *)addr,
-				    sizeof (struct dqblk32)))
-			return -EFAULT;
-		d.dqb_itime = ((struct dqblk32 *)&d)->dqb_itime;
-		d.dqb_btime = ((struct dqblk32 *)&d)->dqb_btime;
-		break;
-	default:
-		return sys_quotactl(cmd, special,
-				    id, (caddr_t)addr);
-	}
-	spec = getname (special);
-	err = PTR_ERR(spec);
-	if (IS_ERR(spec)) return err;
-	old_fs = get_fs ();
-	set_fs (KERNEL_DS);
-	err = sys_quotactl(cmd, (const char *)spec, id, (caddr_t)&d);
-	set_fs (old_fs);
-	putname (spec);
-	if (cmds == Q_GETQUOTA) {
-		__kernel_time_t b = d.dqb_btime, i = d.dqb_itime;
-		((struct dqblk32 *)&d)->dqb_itime = i;
-		((struct dqblk32 *)&d)->dqb_btime = b;
-		if (copy_to_user ((struct dqblk32 *)addr, &d,
-				  sizeof (struct dqblk32)))
-			return -EFAULT;
-	}
-	return err;
-}
-
 static inline int put_statfs (struct statfs32 *ubuf, struct statfs *kbuf)
 {
 	int err;

arch/sparc64/kernel/systbls.S

@@ -52,7 +52,7 @@ sys_call_table32:
 /*150*/	.word sys_nis_syscall, sys_nis_syscall, sys_nis_syscall, sys_poll, sys_getdents64
 	.word sys32_fcntl64, sys_nis_syscall, sys32_statfs, sys32_fstatfs, sys_oldumount
 /*160*/	.word sys32_sched_setaffinity, sys32_sched_getaffinity, sys_getdomainname, sys_setdomainname, sys_nis_syscall
-	.word sys32_quotactl, sys_nis_syscall, sys32_mount, sys_ustat, sys_setxattr
+	.word sys_quotactl, sys_nis_syscall, sys32_mount, sys_ustat, sys_setxattr
 /*170*/	.word sys_lsetxattr, sys_fsetxattr, sys_getxattr, sys_lgetxattr, sys32_getdents
 	.word sys_setsid, sys_fchdir, sys_fgetxattr, sys_listxattr, sys_llistxattr
 /*180*/	.word sys_flistxattr, sys_removexattr, sys_lremovexattr, sys32_sigpending, sys32_query_module
@@ -194,7 +194,7 @@ sunos_sys_table:
 	.word sunos_getdirentries, sys32_statfs, sys32_fstatfs
 	.word sys_oldumount, sunos_nosys, sunos_nosys
 	.word sys_getdomainname, sys_setdomainname
-	.word sunos_nosys, sys32_quotactl, sunos_nosys
+	.word sunos_nosys, sys_quotactl, sunos_nosys
 	.word sunos_mount, sys_ustat, sunos_semsys
 	.word sunos_nosys, sunos_shmsys, sunos_audit
 	.word sunos_nosys, sunos_getdents, sys_setsid

fs/Makefile

@@ -15,7 +15,7 @@ obj-y :=	open.o read_write.o devices.o file_table.o buffer.o \
 		namei.o fcntl.o ioctl.o readdir.o select.o fifo.o locks.o \
 		dcache.o inode.o attr.o bad_inode.o file.o iobuf.o dnotify.o \
 		filesystems.o namespace.o seq_file.o xattr.o libfs.o \
-		fs-writeback.o
+		fs-writeback.o quota.o
 
 ifneq ($(CONFIG_NFSD),n)
 ifneq ($(CONFIG_NFSD),)

fs/quota.c

+/*
+ * Quota code necessary even when VFS quota support is not compiled
+ * into the kernel.  The interesting stuff is over in dquot.c, here
+ * we have symbols for initial quotactl(2) handling, the sysctl(2)
+ * variables, etc - things needed even when quota support disabled.
+ */
+
+#include <linux/fs.h>
+#include <linux/slab.h>
+#include <asm/current.h>
+#include <asm/uaccess.h>
+#include <linux/kernel.h>
+#include <linux/smp_lock.h>
+
+int nr_dquots, nr_free_dquots;
+
+/* Check validity of quotactl */
+static int check_quotactl_valid(struct super_block *sb, int type, int cmd, qid_t id)
+{
+	if (type >= MAXQUOTAS)
+		return -EINVAL;
+	/* Is operation supported? */
+	if (!sb->s_qcop)
+		return -ENOSYS;
+
+	switch (cmd) {
+		case Q_GETFMT:
+			break;
+		case Q_QUOTAON:
+			if (!sb->s_qcop->quota_on)
+				return -ENOSYS;
+			break;
+		case Q_QUOTAOFF:
+			if (!sb->s_qcop->quota_off)
+				return -ENOSYS;
+			break;
+		case Q_SETINFO:
+			if (!sb->s_qcop->set_info)
+				return -ENOSYS;
+			break;
+		case Q_GETINFO:
+			if (!sb->s_qcop->get_info)
+				return -ENOSYS;
+			break;
+		case Q_SETQUOTA:
+			if (!sb->s_qcop->set_dqblk)
+				return -ENOSYS;
+			break;
+		case Q_GETQUOTA:
+			if (!sb->s_qcop->get_dqblk)
+				return -ENOSYS;
+		break;
+		case Q_SYNC:
+			if (!sb->s_qcop->quota_sync)
+				return -ENOSYS;
+			break;
+		case Q_XQUOTAON:
+		case Q_XQUOTAOFF:
+		case Q_XQUOTARM:
+			if (!sb->s_qcop->set_xstate)
+				return -ENOSYS;
+			break;
+		case Q_XGETQSTAT:
+			if (!sb->s_qcop->get_xstate)
+				return -ENOSYS;
+			break;
+		case Q_XSETQLIM:
+			if (!sb->s_qcop->set_xquota)
+				return -ENOSYS;
+			break;
+		case Q_XGETQUOTA:
+			if (!sb->s_qcop->get_xquota)
+				return -ENOSYS;
+			break;
+		default:
+			return -EINVAL;
+	}
+
+	/* Is quota turned on for commands which need it? */
+	switch (cmd) {
+		case Q_GETFMT:
+		case Q_GETINFO:
+		case Q_QUOTAOFF:
+		case Q_SETINFO:
+		case Q_SETQUOTA:
+		case Q_GETQUOTA:
+			if (!sb_has_quota_enabled(sb, type))
+				return -ESRCH;
+	}
+	/* Check privileges */
+	if (cmd == Q_GETQUOTA || cmd == Q_XGETQUOTA) {
+		if (((type == USRQUOTA && current->euid != id) ||
+		     (type == GRPQUOTA && !in_egroup_p(id))) &&
+		    !capable(CAP_SYS_ADMIN))
+			return -EPERM;
+	}
+	else if (cmd != Q_GETFMT && cmd != Q_SYNC && cmd != Q_GETINFO && cmd != Q_XGETQSTAT)
+		if (!capable(CAP_SYS_ADMIN))
+			return -EPERM;
+	return 0;
+}
+
+/* Resolve device pathname to superblock */
+static struct super_block *resolve_dev(const char *path)
+{
+	int ret;
+	mode_t mode;
+	struct nameidata nd;
+	kdev_t dev;
+	struct super_block *sb;
+
+	ret = user_path_walk(path, &nd);
+	if (ret)
+		goto out;
+
+	dev = nd.dentry->d_inode->i_rdev;
+	mode = nd.dentry->d_inode->i_mode;
+	path_release(&nd);
+
+	ret = -ENOTBLK;
+	if (!S_ISBLK(mode))
+		goto out;
+	ret = -ENODEV;
+	sb = get_super(dev);
+	if (!sb)
+		goto out;
+	return sb;
+out:
+	return ERR_PTR(ret);
+}
+
+/* Copy parameters and call proper function */
+static int do_quotactl(struct super_block *sb, int type, int cmd, qid_t id, caddr_t addr)
+{
+	int ret;
+
+	switch (cmd) {
+		case Q_QUOTAON: {
+			char *pathname;
+
+			if (IS_ERR(pathname = getname(addr)))
+				return PTR_ERR(pathname);
+			ret = sb->s_qcop->quota_on(sb, type, id, pathname);
+			putname(pathname);
+			return ret;
+		}
+		case Q_QUOTAOFF:
+			return sb->s_qcop->quota_off(sb, type);
+
+		case Q_GETFMT: {
+			__u32 fmt;
+
+			fmt = sb_dqopt(sb)->info[type].dqi_format->qf_fmt_id;
+			if (copy_to_user(addr, &fmt, sizeof(fmt)))
+				return -EFAULT;
+			return 0;
+		}
+		case Q_GETINFO: {
+			struct if_dqinfo info;
+
+			if ((ret = sb->s_qcop->get_info(sb, type, &info)))
+				return ret;
+			if (copy_to_user(addr, &info, sizeof(info)))
+				return -EFAULT;
+			return 0;
+		}
+		case Q_SETINFO: {
+			struct if_dqinfo info;
+
+			if (copy_from_user(&info, addr, sizeof(info)))
+				return -EFAULT;
+			return sb->s_qcop->set_info(sb, type, &info);
+		}
+		case Q_GETQUOTA: {
+			struct if_dqblk idq;
+
+			if ((ret = sb->s_qcop->get_dqblk(sb, type, id, &idq)))
+				return ret;
+			if (copy_to_user(addr, &idq, sizeof(idq)))
+				return -EFAULT;
+			return 0;
+		}
+		case Q_SETQUOTA: {
+			struct if_dqblk idq;
+
+			if (copy_from_user(&idq, addr, sizeof(idq)))
+				return -EFAULT;
+			return sb->s_qcop->set_dqblk(sb, type, id, &idq);
+		}
+		case Q_SYNC:
+			return sb->s_qcop->quota_sync(sb, type);
+
+		case Q_XQUOTAON:
+		case Q_XQUOTAOFF:
+		case Q_XQUOTARM: {
+			__u32 flags;
+
+			if (copy_from_user(&flags, addr, sizeof(flags)))
+				return -EFAULT;
+			return sb->s_qcop->set_xstate(sb, flags, cmd);
+		}
+		case Q_XGETQSTAT: {
+			struct fs_quota_stat fqs;
+		
+			if ((ret = sb->s_qcop->get_xstate(sb, &fqs)))
+				return ret;
+			if (copy_to_user(addr, &fqs, sizeof(fqs)))
+				return -EFAULT;
+			return 0;
+		}
+		case Q_XSETQLIM: {
+			struct fs_disk_quota fdq;
+
+			if (copy_from_user(&fdq, addr, sizeof(fdq)))
+				return -EFAULT;
+		       return sb->s_qcop->set_xquota(sb, type, id, &fdq);
+		}
+		case Q_XGETQUOTA: {
+			struct fs_disk_quota fdq;
+
+			if ((ret = sb->s_qcop->get_xquota(sb, type, id, &fdq)))
+				return ret;
+			if (copy_to_user(addr, &fdq, sizeof(fdq)))
+				return -EFAULT;
+			return 0;
+		}
+		/* We never reach here unless validity check is broken */
+		default:
+			BUG();
+	}
+	return 0;
+}
+
+/*
+ * This is the system call interface. This communicates with
+ * the user-level programs. Currently this only supports diskquota
+ * calls. Maybe we need to add the process quotas etc. in the future,
+ * but we probably should use rlimits for that.
+ */
+asmlinkage long sys_quotactl(unsigned int cmd, const char *special, qid_t id, caddr_t addr)
+{
+	uint cmds, type;
+	struct super_block *sb = NULL;
+	int ret = -EINVAL;
+
+	lock_kernel();
+	cmds = cmd >> SUBCMDSHIFT;
+	type = cmd & SUBCMDMASK;
+
+	if (IS_ERR(sb = resolve_dev(special))) {
+		ret = PTR_ERR(sb);
+		sb = NULL;
+		goto out;
+	}
+	if ((ret = check_quotactl_valid(sb, type, cmds, id)) < 0)
+		goto out;
+	ret = do_quotactl(sb, type, cmds, id, addr);
+out:
+	if (sb)
+		drop_super(sb);
+	unlock_kernel();
+	return ret;
+}

fs/super.c

@@ -27,6 +27,7 @@
 #include <linux/devfs_fs_kernel.h>
 #include <linux/acct.h>
 #include <linux/blkdev.h>
+#include <linux/quotaops.h>
 #include <asm/uaccess.h>
 
 void get_filesystem(struct file_system_type *fs);
@@ -62,6 +63,8 @@ static struct super_block *alloc_super(void)
 		sema_init(&s->s_dquot.dqio_sem, 1);
 		sema_init(&s->s_dquot.dqoff_sem, 1);
 		s->s_maxbytes = MAX_NON_LFS;
+		s->dq_op = sb_dquot_ops;
+		s->s_qcop = sb_quotactl_ops;
 	}
 	return s;
 }

include/linux/fs.h

@@ -626,7 +626,7 @@ struct quota_info {
 	struct semaphore dqoff_sem;		/* serialize quota_off() and quota_on() on device */
 	struct file *files[MAXQUOTAS];		/* fp's to quotafiles */
 	struct mem_dqinfo info[MAXQUOTAS];	/* Information for each quota type */
-	struct quota_format_ops *ops[MAXQUOTAS];	/* Operations for each format */
+	struct quota_format_ops *ops[MAXQUOTAS];	/* Operations for each type */
 };
 
 /*
@@ -659,6 +659,7 @@ struct super_block {
 	struct file_system_type	*s_type;
 	struct super_operations	*s_op;
 	struct dquot_operations	*dq_op;
+ 	struct quotactl_ops	*s_qcop;
 	struct export_operations *s_export_op;
 	unsigned long		s_flags;
 	unsigned long		s_magic;
@@ -878,16 +879,6 @@ static inline void mark_inode_dirty_sync(struct inode *inode)
 	__mark_inode_dirty(inode, I_DIRTY_SYNC);
 }
 
-struct dquot_operations {
-	void (*initialize) (struct inode *, short);
-	void (*drop) (struct inode *);
-	int (*alloc_space) (struct inode *, qsize_t, int);
-	int (*alloc_inode) (const struct inode *, unsigned long);
-	void (*free_space) (struct inode *, qsize_t);
-	void (*free_inode) (const struct inode *, unsigned long);
-	int (*transfer) (struct inode *, struct iattr *);
-};
-
 
 /**
  * &export_operations - for nfsd to communicate with file systems

include/linux/quota.h

@@ -70,9 +70,6 @@ typedef __u64 qsize_t;          /* Type in which we store sizes */
 	"undefined", \
 };
 
-#define QUOTAFILENAME "quota"
-#define QUOTAGROUP "staff"
-
 /*
  * Command definitions for the 'quotactl' system call.
  * The commands are broken into a main command defined below
@@ -83,7 +80,61 @@ typedef __u64 qsize_t;          /* Type in which we store sizes */
 #define SUBCMDSHIFT 8
 #define QCMD(cmd, type)  (((cmd) << SUBCMDSHIFT) | ((type) & SUBCMDMASK))
 
-#define Q_SYNC     0x0600	/* sync disk copy of a filesystems quotas */
+#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/xqm.h>
 
 /*
  * Data for one user/group kept in memory
@@ -105,7 +156,7 @@ struct mem_dqblk {
 struct quota_format_type;
 
 struct mem_dqinfo {
-	struct quota_format_type * dqi_format;
+	struct quota_format_type *dqi_format;
 	int dqi_flags;
 	unsigned int dqi_bgrace;
 	unsigned int dqi_igrace;
@@ -113,8 +164,6 @@ struct mem_dqinfo {
 	} u;
 };
 
-#ifdef __KERNEL__
-
 #define DQF_MASK 0xffff		/* Mask for format specific flags */
 #define DQF_INFO_DIRTY 0x10000  /* Is info dirty? */
 
@@ -127,24 +176,6 @@ extern inline void mark_info_dirty(struct mem_dqinfo *info)
 
 #define sb_dqopt(sb) (&(sb)->s_dquot)
 
-#endif  /* __KERNEL__ */
-
-/*
- * Shorthand notation.
- */
-#define	dq_bhardlimit	dq_dqb.dqb_bhardlimit
-#define	dq_bsoftlimit	dq_dqb.dqb_bsoftlimit
-#define	dq_curspace	dq_dqb.dqb_curspace
-#define	dq_ihardlimit	dq_dqb.dqb_ihardlimit
-#define	dq_isoftlimit	dq_dqb.dqb_isoftlimit
-#define	dq_curinodes	dq_dqb.dqb_curinodes
-#define	dq_btime	dq_dqb.dqb_btime
-#define	dq_itime	dq_dqb.dqb_itime
-
-#define dqoff(UID)      ((loff_t)((UID) * sizeof (struct dqblk)))
-
-#ifdef __KERNEL__
-
 extern int nr_dquots, nr_free_dquots;
 
 struct dqstats {
@@ -203,25 +234,70 @@ extern inline void mark_dquot_dirty(struct dquot *dquot)
 /* 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 */
+	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 (or delete) structure for one user */
 };
 
+/* Operations working with dquots */
+struct dquot_operations {
+	void (*initialize) (struct inode *, short);
+	void (*drop) (struct inode *);
+	int (*alloc_space) (struct inode *, qsize_t, int);
+	int (*alloc_inode) (const struct inode *, unsigned long);
+	void (*free_space) (struct inode *, qsize_t);
+	void (*free_inode) (const struct inode *, unsigned long);
+	int (*transfer) (struct inode *, struct iattr *);
+};
+
+/* 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;
 };
 
+static inline int is_enabled(struct quota_info *dqopt, int type)
+{
+	switch (type) {
+		case USRQUOTA:
+			return dqopt->flags & DQUOT_USR_ENABLED;
+		case GRPQUOTA:
+			return dqopt->flags & DQUOT_GRP_ENABLED;
+	}
+	return 0;
+}
+
+#define sb_any_quota_enabled(sb) (is_enabled(sb_dqopt(sb), USRQUOTA) | is_enabled(sb_dqopt(sb), GRPQUOTA))
+
+#define sb_has_quota_enabled(sb, type) (is_enabled(sb_dqopt(sb), type))
+
+int register_quota_format(struct quota_format_type *fmt);
+void unregister_quota_format(struct quota_format_type *fmt);
+
 #else
 
 # /* nodep */ include <sys/cdefs.h>
 
 __BEGIN_DECLS
-long quotactl __P ((int, const char *, int, caddr_t));
+long quotactl __P ((unsigned int, const char *, int, caddr_t));
 __END_DECLS
 
 #endif /* __KERNEL__ */

include/linux/quotaops.h

@@ -20,10 +20,10 @@
 /*
  * declaration of quota_function calls in kernel.
  */
+extern int sync_dquots(kdev_t dev, short type);
+
 extern void dquot_initialize(struct inode *inode, short type);
 extern void dquot_drop(struct inode *inode);
-extern int  quota_off(struct super_block *sb, short type);
-extern int  sync_dquots(struct super_block *sb, short type);
 
 extern int  dquot_alloc_space(struct inode *inode, qsize_t number, int prealloc);
 extern int  dquot_alloc_inode(const struct inode *inode, unsigned long number);
@@ -36,7 +36,11 @@ extern int  dquot_transfer(struct inode *inode, struct iattr *iattr);
 /*
  * Operations supported for diskquotas.
  */
-#define sb_any_quota_enabled(sb) ((sb)->s_dquot.flags & (DQUOT_USR_ENABLED | DQUOT_GRP_ENABLED))
+extern struct dquot_operations dquot_operations;
+extern struct quotactl_ops vfs_quotactl_ops;
+
+#define sb_dquot_ops (&dquot_operations)
+#define sb_quotactl_ops (&vfs_quotactl_ops)
 
 static __inline__ void DQUOT_INIT(struct inode *inode)
 {
@@ -160,13 +164,25 @@ static __inline__ int DQUOT_TRANSFER(struct inode *inode, struct iattr *iattr)
 }
 
 #define DQUOT_SYNC(sb)	sync_dquots(sb, -1)
-#define DQUOT_OFF(sb)	quota_off(sb, -1)
+
+static __inline__ int DQUOT_OFF(struct super_block *sb)
+{
+	int ret = -ENOSYS;
+
+	lock_kernel();
+	if (sb->s_qcop && sb->s_qcop->quota_off)
+		ret = sb->s_qcop->quota_off(sb, -1);
+	unlock_kernel();
+	return ret;
+}
 
 #else
 
 /*
  * NO-OP when quota not configured.
  */
+#define sb_dquot_ops				(NULL)
+#define sb_quotactl_ops				(NULL)
 #define DQUOT_INIT(inode)			do { } while(0)
 #define DQUOT_DROP(inode)			do { } while(0)
 #define DQUOT_ALLOC_INODE(inode)		(0)

include/linux/xqm.h

+/*
+ * Copyright (c) 1995-2001 Silicon Graphics, Inc.  All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of version 2.1 of the GNU Lesser 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.
+ *
+ * Further, this software is distributed without any warranty that it is
+ * free of the rightful claim of any third person regarding infringement
+ * or the like.  Any license provided herein, whether implied or
+ * otherwise, applies only to this software file.  Patent licenses, if
+ * any, provided herein do not apply to combinations of this program with
+ * other software, or any other product whatsoever.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, write the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston MA 02111-1307,
+ * USA.
+ *
+ * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
+ * Mountain View, CA  94043, or:
+ *
+ * http://www.sgi.com
+ *
+ * For further information regarding this notice, see:
+ *
+ * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
+ */
+#ifndef _LINUX_XQM_H
+#define _LINUX_XQM_H
+
+#include <linux/types.h>
+
+/*
+ * Disk quota - quotactl(2) commands for the XFS Quota Manager (XQM).
+ */
+
+#define XQM_CMD(x)	(('X'<<8)+(x))	/* note: forms first QCMD argument */
+#define Q_XQUOTAON	XQM_CMD(0x1)	/* enable accounting/enforcement */
+#define Q_XQUOTAOFF	XQM_CMD(0x2)	/* disable accounting/enforcement */
+#define Q_XGETQUOTA	XQM_CMD(0x3)	/* get disk limits and usage */
+#define Q_XSETQLIM	XQM_CMD(0x4)	/* set disk limits */
+#define Q_XGETQSTAT	XQM_CMD(0x5)	/* get quota subsystem status */
+#define Q_XQUOTARM	XQM_CMD(0x6)	/* free disk space used by dquots */
+
+/*
+ * fs_disk_quota structure:
+ *
+ * This contains the current quota information regarding a user/proj/group.
+ * It is 64-bit aligned, and all the blk units are in BBs (Basic Blocks) of
+ * 512 bytes.
+ */
+#define FS_DQUOT_VERSION	1	/* fs_disk_quota.d_version */
+typedef struct fs_disk_quota {
+	__s8		d_version;	/* version of this structure */
+	__s8		d_flags;	/* XFS_{USER,PROJ,GROUP}_QUOTA */
+	__u16		d_fieldmask;	/* field specifier */
+	__u32		d_id;		/* user, project, or group ID */
+	__u64		d_blk_hardlimit;/* absolute limit on disk blks */
+	__u64		d_blk_softlimit;/* preferred limit on disk blks */
+	__u64		d_ino_hardlimit;/* maximum # allocated inodes */
+	__u64		d_ino_softlimit;/* preferred inode limit */
+	__u64		d_bcount;	/* # disk blocks owned by the user */
+	__u64		d_icount;	/* # inodes owned by the user */
+	__s32		d_itimer;	/* zero if within inode limits */
+					/* if not, we refuse service */
+	__s32		d_btimer;	/* similar to above; for disk blocks */
+	__u16	  	d_iwarns;       /* # warnings issued wrt num inodes */
+	__u16	  	d_bwarns;       /* # warnings issued wrt disk blocks */
+	__s32		d_padding2;	/* padding2 - for future use */
+	__u64		d_rtb_hardlimit;/* absolute limit on realtime blks */
+	__u64		d_rtb_softlimit;/* preferred limit on RT disk blks */
+	__u64		d_rtbcount;	/* # realtime blocks owned */
+	__s32		d_rtbtimer;	/* similar to above; for RT disk blks */
+	__u16	  	d_rtbwarns;     /* # warnings issued wrt RT disk blks */
+	__s16		d_padding3;	/* padding3 - for future use */	
+	char		d_padding4[8];	/* yet more padding */
+} fs_disk_quota_t;
+
+/*
+ * These fields are sent to Q_XSETQLIM to specify fields that need to change.
+ */
+#define FS_DQ_ISOFT	(1<<0)
+#define FS_DQ_IHARD	(1<<1)
+#define FS_DQ_BSOFT	(1<<2)
+#define FS_DQ_BHARD 	(1<<3)
+#define FS_DQ_RTBSOFT	(1<<4)
+#define FS_DQ_RTBHARD	(1<<5)
+#define FS_DQ_LIMIT_MASK	(FS_DQ_ISOFT | FS_DQ_IHARD | FS_DQ_BSOFT | \
+				 FS_DQ_BHARD | FS_DQ_RTBSOFT | FS_DQ_RTBHARD)
+/*
+ * These timers can only be set in super user's dquot. For others, timers are
+ * automatically started and stopped. Superusers timer values set the limits
+ * for the rest.  In case these values are zero, the DQ_{F,B}TIMELIMIT values
+ * defined below are used. 
+ * These values also apply only to the d_fieldmask field for Q_XSETQLIM.
+ */
+#define FS_DQ_BTIMER	(1<<6)
+#define FS_DQ_ITIMER	(1<<7)
+#define FS_DQ_RTBTIMER 	(1<<8)
+#define FS_DQ_TIMER_MASK	(FS_DQ_BTIMER | FS_DQ_ITIMER | FS_DQ_RTBTIMER)
+
+/*
+ * The following constants define the default amount of time given a user
+ * before the soft limits are treated as hard limits (usually resulting
+ * in an allocation failure).  These may be modified by the quotactl(2)
+ * system call with the Q_XSETQLIM command.
+ */
+#define	DQ_FTIMELIMIT	(7 * 24*60*60)		/* 1 week */
+#define	DQ_BTIMELIMIT	(7 * 24*60*60)		/* 1 week */
+
+/*
+ * Various flags related to quotactl(2).  Only relevant to XFS filesystems.
+ */
+#define XFS_QUOTA_UDQ_ACCT	(1<<0)  /* user quota accounting */
+#define XFS_QUOTA_UDQ_ENFD	(1<<1)  /* user quota limits enforcement */
+#define XFS_QUOTA_GDQ_ACCT	(1<<2)  /* group quota accounting */
+#define XFS_QUOTA_GDQ_ENFD	(1<<3)  /* group quota limits enforcement */
+
+#define XFS_USER_QUOTA		(1<<0)	/* user quota type */
+#define XFS_PROJ_QUOTA		(1<<1)	/* (IRIX) project quota type */
+#define XFS_GROUP_QUOTA		(1<<2)	/* group quota type */
+
+/*
+ * fs_quota_stat is the struct returned in Q_XGETQSTAT for a given file system.
+ * Provides a centralized way to get meta infomation about the quota subsystem.
+ * eg. space taken up for user and group quotas, number of dquots currently
+ * incore.
+ */
+#define FS_QSTAT_VERSION	1	/* fs_quota_stat.qs_version */
+
+/*
+ * Some basic infomation about 'quota files'.
+ */
+typedef struct fs_qfilestat {
+	__u64		qfs_ino;	/* inode number */
+	__u64		qfs_nblks;	/* number of BBs 512-byte-blks */
+	__u32		qfs_nextents;	/* number of extents */
+} fs_qfilestat_t;
+
+typedef struct fs_quota_stat {
+	__s8		qs_version;	/* version number for future changes */
+	__u16		qs_flags;	/* XFS_QUOTA_{U,P,G}DQ_{ACCT,ENFD} */
+	__s8		qs_pad;		/* unused */
+	fs_qfilestat_t	qs_uquota;	/* user quota storage information */
+	fs_qfilestat_t	qs_gquota;	/* group quota storage information */
+	__u32		qs_incoredqs;	/* number of dquots incore */
+	__s32		qs_btimelimit;  /* limit for blks timer */	
+	__s32		qs_itimelimit;  /* limit for inodes timer */	
+	__s32		qs_rtbtimelimit;/* limit for rt blks timer */	
+	__u16		qs_bwarnlimit;	/* limit for num warnings */
+	__u16		qs_iwarnlimit;	/* limit for num warnings */
+} fs_quota_stat_t;
+
+#endif	/* _LINUX_XQM_H */