[XFS] remove dependency of the quota module on behaviors

Mount options are now parsed by the main XFS module and rejected if quota
support is not available, and there are some new quota operation for the
quotactl syscall and calls to quote in the mount, unmount and sync
callchains.

SGI-PV: 969608
SGI-Modid: xfs-linux-melb:xfs-kern:29503a

Signed-off-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: David Chinner <dgc@sgi.com>
Signed-off-by: Tim Shimmin <tes@sgi.com>

1 files changed, 33 insertions, 206 deletions

diff --git a/fs/xfs/quota/xfs_qm_bhv.c b/fs/xfs/quota/xfs_qm_bhv.c
index ca25ee31a02f..97bb32937585 100644
--- a/fs/xfs/quota/xfs_qm_bhv.c
+++ b/fs/xfs/quota/xfs_qm_bhv.c
@@ -48,172 +48,13 @@
 #include "xfs_buf_item.h"
 #include "xfs_qm.h"
 
-#define MNTOPT_QUOTA	"quota"		/* disk quotas (user) */
-#define MNTOPT_NOQUOTA	"noquota"	/* no quotas */
-#define MNTOPT_USRQUOTA	"usrquota"	/* user quota enabled */
-#define MNTOPT_GRPQUOTA	"grpquota"	/* group quota enabled */
-#define MNTOPT_PRJQUOTA	"prjquota"	/* project quota enabled */
-#define MNTOPT_UQUOTA	"uquota"	/* user quota (IRIX variant) */
-#define MNTOPT_GQUOTA	"gquota"	/* group quota (IRIX variant) */
-#define MNTOPT_PQUOTA	"pquota"	/* project quota (IRIX variant) */
-#define MNTOPT_UQUOTANOENF "uqnoenforce"/* user quota limit enforcement */
-#define MNTOPT_GQUOTANOENF "gqnoenforce"/* group quota limit enforcement */
-#define MNTOPT_PQUOTANOENF "pqnoenforce"/* project quota limit enforcement */
-#define MNTOPT_QUOTANOENF  "qnoenforce"	/* same as uqnoenforce */
 
-STATIC int
-xfs_qm_parseargs(
-	struct bhv_desc		*bhv,
-	char			*options,
-	struct xfs_mount_args	*args,
-	int			update)
-{
-	size_t			length;
-	char			*local_options = options;
-	char			*this_char;
-	int			error;
-	int			referenced = update;
-
-	while ((this_char = strsep(&local_options, ",")) != NULL) {
-		length = strlen(this_char);
-		if (local_options)
-			length++;
-
-		if (!strcmp(this_char, MNTOPT_NOQUOTA)) {
-			args->flags &= ~(XFSMNT_UQUOTAENF|XFSMNT_UQUOTA);
-			args->flags &= ~(XFSMNT_GQUOTAENF|XFSMNT_GQUOTA);
-			referenced = update;
-		} else if (!strcmp(this_char, MNTOPT_QUOTA) ||
-			   !strcmp(this_char, MNTOPT_UQUOTA) ||
-			   !strcmp(this_char, MNTOPT_USRQUOTA)) {
-			args->flags |= XFSMNT_UQUOTA | XFSMNT_UQUOTAENF;
-			referenced = 1;
-		} else if (!strcmp(this_char, MNTOPT_QUOTANOENF) ||
-			   !strcmp(this_char, MNTOPT_UQUOTANOENF)) {
-			args->flags |= XFSMNT_UQUOTA;
-			args->flags &= ~XFSMNT_UQUOTAENF;
-			referenced = 1;
-		} else if (!strcmp(this_char, MNTOPT_PQUOTA) ||
-			   !strcmp(this_char, MNTOPT_PRJQUOTA)) {
-			args->flags |= XFSMNT_PQUOTA | XFSMNT_PQUOTAENF;
-			referenced = 1;
-		} else if (!strcmp(this_char, MNTOPT_PQUOTANOENF)) {
-			args->flags |= XFSMNT_PQUOTA;
-			args->flags &= ~XFSMNT_PQUOTAENF;
-			referenced = 1;
-		} else if (!strcmp(this_char, MNTOPT_GQUOTA) ||
-			   !strcmp(this_char, MNTOPT_GRPQUOTA)) {
-			args->flags |= XFSMNT_GQUOTA | XFSMNT_GQUOTAENF;
-			referenced = 1;
-		} else if (!strcmp(this_char, MNTOPT_GQUOTANOENF)) {
-			args->flags |= XFSMNT_GQUOTA;
-			args->flags &= ~XFSMNT_GQUOTAENF;
-			referenced = 1;
-		} else {
-			if (local_options)
-				*(local_options-1) = ',';
-			continue;
-		}
-
-		while (length--)
-			*this_char++ = ',';
-	}
-
-	if ((args->flags & XFSMNT_GQUOTA) && (args->flags & XFSMNT_PQUOTA)) {
-		cmn_err(CE_WARN,
-			"XFS: cannot mount with both project and group quota");
-		return XFS_ERROR(EINVAL);
-	}
-
-	error = bhv_next_vfs_parseargs(BHV_NEXT(bhv), options, args, update);
-	if (!error && !referenced)
-		bhv_remove_vfsops(bhvtovfs(bhv), VFS_POSITION_QM);
-	return error;
-}
-
-STATIC int
-xfs_qm_showargs(
-	struct bhv_desc		*bhv,
-	struct seq_file		*m)
-{
-	struct bhv_vfs		*vfsp = bhvtovfs(bhv);
-	struct xfs_mount	*mp = XFS_VFSTOM(vfsp);
-
-	if (mp->m_qflags & XFS_UQUOTA_ACCT) {
-		(mp->m_qflags & XFS_UQUOTA_ENFD) ?
-			seq_puts(m, "," MNTOPT_USRQUOTA) :
-			seq_puts(m, "," MNTOPT_UQUOTANOENF);
-	}
-
-	if (mp->m_qflags & XFS_PQUOTA_ACCT) {
-		(mp->m_qflags & XFS_OQUOTA_ENFD) ?
-			seq_puts(m, "," MNTOPT_PRJQUOTA) :
-			seq_puts(m, "," MNTOPT_PQUOTANOENF);
-	}
-
-	if (mp->m_qflags & XFS_GQUOTA_ACCT) {
-		(mp->m_qflags & XFS_OQUOTA_ENFD) ?
-			seq_puts(m, "," MNTOPT_GRPQUOTA) :
-			seq_puts(m, "," MNTOPT_GQUOTANOENF);
-	}
-
-	if (!(mp->m_qflags & XFS_ALL_QUOTA_ACCT))
-		seq_puts(m, "," MNTOPT_NOQUOTA);
-
-	return bhv_next_vfs_showargs(BHV_NEXT(bhv), m);
-}
-
-STATIC int
-xfs_qm_mount(
-	struct bhv_desc		*bhv,
-	struct xfs_mount_args	*args,
-	struct cred		*cr)
-{
-	struct bhv_vfs		*vfsp = bhvtovfs(bhv);
-	struct xfs_mount	*mp = XFS_VFSTOM(vfsp);
-
-	if (args->flags & (XFSMNT_UQUOTA | XFSMNT_GQUOTA | XFSMNT_PQUOTA))
-		xfs_qm_mount_quotainit(mp, args->flags);
-	return bhv_next_vfs_mount(BHV_NEXT(bhv), args, cr);
-}
-
-/*
- * Directory tree accounting is implemented using project quotas, where
- * the project identifier is inherited from parent directories.
- * A statvfs (df, etc.) of a directory that is using project quota should
- * return a statvfs of the project, not the entire filesystem.
- * This makes such trees appear as if they are filesystems in themselves.
- */
-STATIC int
-xfs_qm_statvfs(
-	struct bhv_desc		*bhv,
+STATIC void
+xfs_fill_statvfs_from_dquot(
 	bhv_statvfs_t		*statp,
-	bhv_vnode_t		*vnode)
+	xfs_disk_dquot_t	*dp)
 {
-	xfs_mount_t		*mp;
-	xfs_inode_t		*ip;
-	xfs_dquot_t		*dqp;
-	xfs_disk_dquot_t	*dp;
 	__uint64_t		limit;
-	int			error;
-
-	error = bhv_next_vfs_statvfs(BHV_NEXT(bhv), statp, vnode);
-	if (error || !vnode)
-		return error;
-
-	mp = xfs_vfstom(bhvtovfs(bhv));
-	ip = xfs_vtoi(vnode);
-
-	if (!(ip->i_d.di_flags & XFS_DIFLAG_PROJINHERIT))
-		return 0;
-	if (!(mp->m_qflags & XFS_PQUOTA_ACCT))
-		return 0;
-	if (!(mp->m_qflags & XFS_OQUOTA_ENFD))
-		return 0;
-
-	if (xfs_qm_dqget(mp, NULL, ip->i_d.di_projid, XFS_DQ_PROJ, 0, &dqp))
-		return 0;
-	dp = &dqp->q_core;
 
 	limit = dp->d_blk_softlimit ?
 		be64_to_cpu(dp->d_blk_softlimit) :
@@ -234,37 +75,35 @@ xfs_qm_statvfs(
 			(statp->f_files > be64_to_cpu(dp->d_icount)) ?
 			 (statp->f_ffree - be64_to_cpu(dp->d_icount)) : 0;
 	}
-
-	xfs_qm_dqput(dqp);
-	return 0;
 }
 
-STATIC int
-xfs_qm_syncall(
-	struct bhv_desc		*bhv,
-	int			flags,
-	cred_t			*credp)
+
+/*
+ * Directory tree accounting is implemented using project quotas, where
+ * the project identifier is inherited from parent directories.
+ * A statvfs (df, etc.) of a directory that is using project quota should
+ * return a statvfs of the project, not the entire filesystem.
+ * This makes such trees appear as if they are filesystems in themselves.
+ */
+STATIC void
+xfs_qm_statvfs(
+	xfs_inode_t		*ip,
+	bhv_statvfs_t		*statp)
 {
-	struct bhv_vfs		*vfsp = bhvtovfs(bhv);
-	struct xfs_mount	*mp = XFS_VFSTOM(vfsp);
-	int			error;
+	xfs_mount_t		*mp = ip->i_mount;
+	xfs_dquot_t		*dqp;
 
-	/*
-	 * Get the Quota Manager to flush the dquots.
-	 */
-	if (XFS_IS_QUOTA_ON(mp)) {
-		if ((error = xfs_qm_sync(mp, flags))) {
-			/*
-			 * If we got an IO error, we will be shutting down.
-			 * So, there's nothing more for us to do here.
-			 */
-			ASSERT(error != EIO || XFS_FORCED_SHUTDOWN(mp));
-			if (XFS_FORCED_SHUTDOWN(mp)) {
-				return XFS_ERROR(error);
-			}
-		}
+	if (!(ip->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) ||
+	    !((mp->m_qflags & (XFS_PQUOTA_ACCT|XFS_OQUOTA_ENFD))) ==
+	    		      (XFS_PQUOTA_ACCT|XFS_OQUOTA_ENFD))
+		return;
+
+	if (!xfs_qm_dqget(mp, NULL, ip->i_d.di_projid, XFS_DQ_PROJ, 0, &dqp)) {
+		xfs_disk_dquot_t	*dp = &dqp->q_core;
+
+		xfs_fill_statvfs_from_dquot(statp, dp);
+		xfs_qm_dqput(dqp);
 	}
-	return bhv_next_vfs_sync(BHV_NEXT(bhv), flags, credp);
 }
 
 STATIC int
@@ -382,7 +221,7 @@ xfs_qm_dqrele_null(
 }
 
 
-static struct xfs_qmops xfs_qmcore_xfs = {
+struct xfs_qmops xfs_qmcore_xfs = {
 	.xfs_qminit		= xfs_qm_newmount,
 	.xfs_qmdone		= xfs_qm_unmount_quotadestroy,
 	.xfs_qmmount		= xfs_qm_endmount,
@@ -396,36 +235,24 @@ static struct xfs_qmops xfs_qmcore_xfs = {
 	.xfs_dqvoprename	= xfs_qm_vop_rename_dqattach,
 	.xfs_dqvopchown		= xfs_qm_vop_chown,
 	.xfs_dqvopchownresv	= xfs_qm_vop_chown_reserve,
+	.xfs_dqstatvfs		= xfs_qm_statvfs,
+	.xfs_dqsync		= xfs_qm_sync,
+	.xfs_quotactl		= xfs_qm_quotactl,
 	.xfs_dqtrxops		= &xfs_trans_dquot_ops,
 };
-
-struct bhv_module_vfsops xfs_qmops = { {
-	BHV_IDENTITY_INIT(VFS_BHV_QM, VFS_POSITION_QM),
-	.vfs_parseargs		= xfs_qm_parseargs,
-	.vfs_showargs		= xfs_qm_showargs,
-	.vfs_mount		= xfs_qm_mount,
-	.vfs_statvfs		= xfs_qm_statvfs,
-	.vfs_sync		= xfs_qm_syncall,
-	.vfs_quotactl		= xfs_qm_quotactl, },
-};
-
+EXPORT_SYMBOL(xfs_qmcore_xfs);
 
 void __init
 xfs_qm_init(void)
 {
-	static char	message[] __initdata =
-		KERN_INFO "SGI XFS Quota Management subsystem\n";
-
-	printk(message);
+	printk(KERN_INFO "SGI XFS Quota Management subsystem\n");
 	mutex_init(&xfs_Gqm_lock);
-	vfs_bhv_set_custom(&xfs_qmops, &xfs_qmcore_xfs);
 	xfs_qm_init_procfs();
 }
 
 void __exit
 xfs_qm_exit(void)
 {
-	vfs_bhv_clr_custom(&xfs_qmops);
 	xfs_qm_cleanup_procfs();
 	if (qm_dqzone)
 		kmem_zone_destroy(qm_dqzone);