patch-2.4.25 linux-2.4.25/fs/xfs/linux/xfs_super.c

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diff -urN linux-2.4.24/fs/xfs/linux/xfs_super.c linux-2.4.25/fs/xfs/linux/xfs_super.c
@@ -0,0 +1,974 @@
+/*
+ * Copyright (c) 2000-2003 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 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.
+ *
+ * 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 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/
+ */
+
+#include "xfs.h"
+
+#include "xfs_inum.h"
+#include "xfs_log.h"
+#include "xfs_clnt.h"
+#include "xfs_trans.h"
+#include "xfs_sb.h"
+#include "xfs_dir.h"
+#include "xfs_dir2.h"
+#include "xfs_alloc.h"
+#include "xfs_dmapi.h"
+#include "xfs_quota.h"
+#include "xfs_mount.h"
+#include "xfs_alloc_btree.h"
+#include "xfs_bmap_btree.h"
+#include "xfs_ialloc_btree.h"
+#include "xfs_btree.h"
+#include "xfs_ialloc.h"
+#include "xfs_attr_sf.h"
+#include "xfs_dir_sf.h"
+#include "xfs_dir2_sf.h"
+#include "xfs_dinode.h"
+#include "xfs_inode.h"
+#include "xfs_bmap.h"
+#include "xfs_bit.h"
+#include "xfs_rtalloc.h"
+#include "xfs_error.h"
+#include "xfs_itable.h"
+#include "xfs_rw.h"
+#include "xfs_acl.h"
+#include "xfs_cap.h"
+#include "xfs_mac.h"
+#include "xfs_attr.h"
+#include "xfs_buf_item.h"
+#include "xfs_utils.h"
+#include "xfs_version.h"
+
+#include <linux/blkdev.h>
+#include <linux/init.h>
+
+STATIC struct quotactl_ops linvfs_qops;
+STATIC struct super_operations linvfs_sops;
+STATIC kmem_cache_t * linvfs_inode_cachep;
+
+STATIC struct xfs_mount_args *
+xfs_args_allocate(
+	struct super_block	*sb)
+{
+	struct xfs_mount_args	*args;
+
+	args = kmem_zalloc(sizeof(struct xfs_mount_args), KM_SLEEP);
+	args->logbufs = args->logbufsize = -1;
+	strncpy(args->fsname, bdevname(sb->s_dev), MAXNAMELEN);
+
+	/* Copy the already-parsed mount(2) flags we're interested in */
+	if (sb->s_flags & MS_NOATIME)
+		args->flags |= XFSMNT_NOATIME;
+
+	/* Default to 32 bit inodes on Linux all the time */
+	args->flags |= XFSMNT_32BITINODES;
+
+	return args;
+}
+
+__uint64_t
+xfs_max_file_offset(
+	unsigned int		blockshift)
+{
+	unsigned int		pagefactor = 1;
+	unsigned int		bitshift = BITS_PER_LONG - 1;
+
+	/* Figure out maximum filesize, on Linux this can depend on
+	 * the filesystem blocksize (on 32 bit platforms).
+	 * __block_prepare_write does this in an [unsigned] long...
+	 *      page->index << (PAGE_CACHE_SHIFT - bbits)
+	 * So, for page sized blocks (4K on 32 bit platforms),
+	 * this wraps at around 8Tb (hence MAX_LFS_FILESIZE which is
+	 *      (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1)
+	 * but for smaller blocksizes it is less (bbits = log2 bsize).
+	 * Note1: get_block_t takes a long (implicit cast from above)
+	 * Note2: The Large Block Device (LBD and HAVE_SECTOR_T) patch
+	 * can optionally convert the [unsigned] long from above into
+	 * an [unsigned] long long.
+	 */
+
+#if BITS_PER_LONG == 32
+	pagefactor = PAGE_CACHE_SIZE >> (PAGE_CACHE_SHIFT - blockshift);
+#endif
+
+	return (((__uint64_t)pagefactor) << bitshift) - 1;
+}
+
+STATIC __inline__ void
+xfs_set_inodeops(
+	struct inode		*inode)
+{
+	vnode_t			*vp = LINVFS_GET_VP(inode);
+
+	if (vp->v_type == VNON) {
+		remove_inode_hash(inode);
+		make_bad_inode(inode);
+	} else if (S_ISREG(inode->i_mode)) {
+		inode->i_op = &linvfs_file_inode_operations;
+		inode->i_fop = &linvfs_file_operations;
+		inode->i_mapping->a_ops = &linvfs_aops;
+	} else if (S_ISDIR(inode->i_mode)) {
+		inode->i_op = &linvfs_dir_inode_operations;
+		inode->i_fop = &linvfs_dir_operations;
+	} else if (S_ISLNK(inode->i_mode)) {
+		inode->i_op = &linvfs_symlink_inode_operations;
+		if (inode->i_blocks)
+			inode->i_mapping->a_ops = &linvfs_aops;
+	} else {
+		inode->i_op = &linvfs_file_inode_operations;
+		init_special_inode(inode, inode->i_mode,
+					kdev_t_to_nr(inode->i_rdev));
+	}
+}
+
+STATIC __inline__ void
+xfs_revalidate_inode(
+	xfs_mount_t		*mp,
+	vnode_t			*vp,
+	xfs_inode_t		*ip)
+{
+	struct inode		*inode = LINVFS_GET_IP(vp);
+
+	inode->i_mode	= (ip->i_d.di_mode & MODEMASK) | VTTOIF(vp->v_type);
+	inode->i_nlink	= ip->i_d.di_nlink;
+	inode->i_uid	= ip->i_d.di_uid;
+	inode->i_gid	= ip->i_d.di_gid;
+	if (((1 << vp->v_type) & ((1<<VBLK) | (1<<VCHR))) == 0) {
+		inode->i_rdev = NODEV;
+	} else {
+		xfs_dev_t dev = ip->i_df.if_u2.if_rdev;
+		inode->i_rdev = XFS_DEV_TO_KDEVT(dev);
+	}
+	inode->i_blksize = PAGE_CACHE_SIZE;
+	inode->i_generation = ip->i_d.di_gen;
+	i_size_write(inode, ip->i_d.di_size);
+	inode->i_blocks =
+		XFS_FSB_TO_BB(mp, ip->i_d.di_nblocks + ip->i_delayed_blks);
+	inode->i_atime	= ip->i_d.di_atime.t_sec;
+	inode->i_mtime	= ip->i_d.di_mtime.t_sec;
+	inode->i_ctime	= ip->i_d.di_ctime.t_sec;
+	if (ip->i_d.di_flags & XFS_DIFLAG_IMMUTABLE)
+		inode->i_flags |= S_IMMUTABLE;
+	else
+		inode->i_flags &= ~S_IMMUTABLE;
+	if (ip->i_d.di_flags & XFS_DIFLAG_APPEND)
+		inode->i_flags |= S_APPEND;
+	else
+		inode->i_flags &= ~S_APPEND;
+	if (ip->i_d.di_flags & XFS_DIFLAG_SYNC)
+		inode->i_flags |= S_SYNC;
+	else
+		inode->i_flags &= ~S_SYNC;
+	if (ip->i_d.di_flags & XFS_DIFLAG_NOATIME)
+		inode->i_flags |= S_NOATIME;
+	else
+		inode->i_flags &= ~S_NOATIME;
+
+	vp->v_flag &= ~VMODIFIED;
+}
+
+void
+xfs_initialize_vnode(
+	bhv_desc_t		*bdp,
+	vnode_t			*vp,
+	bhv_desc_t		*inode_bhv,
+	int			unlock)
+{
+	xfs_inode_t		*ip = XFS_BHVTOI(inode_bhv);
+	struct inode		*inode = LINVFS_GET_IP(vp);
+
+	if (!inode_bhv->bd_vobj) {
+		vp->v_vfsp = bhvtovfs(bdp);
+		bhv_desc_init(inode_bhv, ip, vp, &xfs_vnodeops);
+		bhv_insert(VN_BHV_HEAD(vp), inode_bhv);
+	}
+
+	vp->v_type = IFTOVT(ip->i_d.di_mode);
+
+	/* Have we been called during the new inode create process,
+	 * in which case we are too early to fill in the Linux inode.
+	 */
+	if (vp->v_type == VNON)
+		return;
+
+	xfs_revalidate_inode(XFS_BHVTOM(bdp), vp, ip);
+
+	/* For new inodes we need to set the ops vectors,
+	 * and unlock the inode.
+	 */
+	if (unlock && (inode->i_state & I_NEW)) {
+		xfs_set_inodeops(inode);
+		unlock_new_inode(inode);
+	}
+}
+
+struct inode *
+xfs_get_inode(
+	bhv_desc_t	*bdp,
+	xfs_ino_t	ino,
+	int		flags)
+{
+	struct vfs	*vfsp = bhvtovfs(bdp);
+
+	return iget_locked(vfsp->vfs_super, ino);
+}
+
+void
+xfs_flush_inode(
+	xfs_inode_t	*ip)
+{
+	struct inode	*inode = LINVFS_GET_IP(XFS_ITOV(ip));
+
+	filemap_fdatawrite(inode->i_mapping);
+}
+
+void
+xfs_flush_device(
+	xfs_inode_t	*ip)
+{
+	struct inode	*inode = LINVFS_GET_IP(XFS_ITOV(ip));
+
+	fsync_no_super(inode->i_dev);
+	xfs_log_force(ip->i_mount, (xfs_lsn_t)0, XFS_LOG_FORCE|XFS_LOG_SYNC);
+}
+
+/*ARGSUSED*/
+int
+xfs_blkdev_get(
+	xfs_mount_t		*mp,
+	const char		*name,
+	struct block_device	**bdevp)
+{
+	struct nameidata	nd;
+	int			error;
+
+	error = path_lookup(name, LOOKUP_POSITIVE|LOOKUP_FOLLOW, &nd);
+	if (error) {
+		printk("XFS: Invalid device [%s], error=%d\n", name, error);
+		return -error;
+	}
+
+	/* I think we actually want bd_acquire here..  --hch */
+	*bdevp = bdget(kdev_t_to_nr(nd.dentry->d_inode->i_rdev));
+	if (*bdevp)
+		error = blkdev_get(*bdevp, FMODE_READ|FMODE_WRITE, 0, BDEV_FS);
+	else
+		error = -ENOMEM;
+
+	path_release(&nd);
+	return -error;
+}
+
+void
+xfs_blkdev_put(
+	struct block_device	*bdev)
+{
+	if (bdev)
+		blkdev_put(bdev, BDEV_FS);
+}
+
+void
+xfs_flush_buftarg(
+	xfs_buftarg_t		*btp)
+{
+	pagebuf_delwri_flush(btp, PBDF_WAIT, NULL);
+}
+
+void
+xfs_free_buftarg(
+	xfs_buftarg_t		*btp)
+{
+	xfs_flush_buftarg(btp);
+	kmem_free(btp, sizeof(*btp));
+}
+
+int
+xfs_readonly_buftarg(
+	xfs_buftarg_t		*btp)
+{
+	return is_read_only(btp->pbr_kdev);
+}
+
+void
+xfs_relse_buftarg(
+	xfs_buftarg_t		*btp)
+{
+	destroy_buffers(btp->pbr_kdev);
+	truncate_inode_pages(btp->pbr_mapping, 0LL);
+}
+
+unsigned int
+xfs_getsize_buftarg(
+	xfs_buftarg_t		*btp)
+{
+	return block_size(btp->pbr_kdev);
+}
+
+void
+xfs_setsize_buftarg(
+	xfs_buftarg_t		*btp,
+	unsigned int		blocksize,
+	unsigned int		sectorsize)
+{
+	btp->pbr_bsize = blocksize;
+	btp->pbr_sshift = ffs(sectorsize) - 1;
+	btp->pbr_smask = sectorsize - 1;
+
+	if (set_blocksize(btp->pbr_kdev, sectorsize)) {
+		printk(KERN_WARNING
+			"XFS: Cannot set_blocksize to %u on device 0x%x\n",
+			sectorsize, kdev_t_to_nr(btp->pbr_kdev));
+	}
+}
+
+xfs_buftarg_t *
+xfs_alloc_buftarg(
+	struct block_device	*bdev)
+{
+	xfs_buftarg_t		*btp;
+
+	btp = kmem_zalloc(sizeof(*btp), KM_SLEEP);
+
+	btp->pbr_dev =  bdev->bd_dev;
+	btp->pbr_kdev = to_kdev_t(btp->pbr_dev);
+	btp->pbr_bdev = bdev;
+	btp->pbr_mapping = bdev->bd_inode->i_mapping;
+	xfs_setsize_buftarg(btp, PAGE_CACHE_SIZE,
+			    get_hardsect_size(btp->pbr_kdev));
+
+	switch (MAJOR(btp->pbr_dev)) {
+	case MD_MAJOR:
+	case EVMS_MAJOR:
+		btp->pbr_flags = PBR_ALIGNED_ONLY;
+		break;
+	case LVM_BLK_MAJOR:
+		btp->pbr_flags = PBR_SECTOR_ONLY;
+		break;
+	}
+
+	return btp;
+}
+
+STATIC struct inode *
+linvfs_alloc_inode(
+	struct super_block	*sb)
+{
+	vnode_t			*vp;
+
+	vp = (vnode_t *)kmem_cache_alloc(linvfs_inode_cachep, 
+                kmem_flags_convert(KM_SLEEP));
+	if (!vp)
+		return NULL;
+	return LINVFS_GET_IP(vp);
+}
+
+STATIC void
+linvfs_destroy_inode(
+	struct inode		*inode)
+{
+	kmem_cache_free(linvfs_inode_cachep, LINVFS_GET_VP(inode));
+}
+
+#define VNODE_SIZE	\
+	(sizeof(vnode_t) - sizeof(struct inode) + offsetof(struct inode, u))
+
+STATIC void
+init_once(
+	void			*data,
+	kmem_cache_t		*cachep,
+	unsigned long		flags)
+{
+	vnode_t			*vp = (vnode_t *)data;
+
+	if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
+	    SLAB_CTOR_CONSTRUCTOR) {
+		struct inode *inode = LINVFS_GET_IP(vp);
+		memset(vp, 0, VNODE_SIZE);
+		__inode_init_once(inode);
+	}
+}
+
+STATIC int
+init_inodecache( void )
+{
+	linvfs_inode_cachep = kmem_cache_create("linvfs_icache",
+				VNODE_SIZE, 0, SLAB_HWCACHE_ALIGN,
+				init_once, NULL);
+
+	if (linvfs_inode_cachep == NULL)
+		return -ENOMEM;
+	return 0;
+}
+
+STATIC void
+destroy_inodecache( void )
+{
+	if (kmem_cache_destroy(linvfs_inode_cachep))
+		printk(KERN_WARNING "%s: cache still in use!\n", __FUNCTION__);
+}
+
+/*
+ * Attempt to flush the inode, this will actually fail
+ * if the inode is pinned, but we dirty the inode again
+ * at the point when it is unpinned after a log write,
+ * since this is when the inode itself becomes flushable. 
+ */
+STATIC void
+linvfs_write_inode(
+	struct inode		*inode,
+	int			sync)
+{
+	vnode_t			*vp = LINVFS_GET_VP(inode);
+	int			error, flags = FLUSH_INODE;
+
+	if (vp) {
+		vn_trace_entry(vp, __FUNCTION__, (inst_t *)__return_address);
+		if (sync)
+			flags |= FLUSH_SYNC;
+		VOP_IFLUSH(vp, flags, error);
+	}
+}
+
+STATIC void
+linvfs_clear_inode(
+	struct inode		*inode)
+{
+	vnode_t			*vp = LINVFS_GET_VP(inode);
+
+	if (vp) {
+		vn_rele(vp);
+		vn_trace_entry(vp, __FUNCTION__, (inst_t *)__return_address);
+		/*
+		 * Do all our cleanup, and remove this vnode.
+		 */
+		vn_remove(vp);
+	}
+}
+
+
+#define SYNCD_FLAGS	(SYNC_FSDATA|SYNC_BDFLUSH|SYNC_ATTR|SYNC_REFCACHE)
+
+STATIC int
+syncd(void *arg)
+{
+	vfs_t			*vfsp = (vfs_t *) arg;
+	int			error;
+
+	daemonize();
+	reparent_to_init();
+	spin_lock_irq(&current->sigmask_lock);
+	sigfillset(&current->blocked);
+	recalc_sigpending(current);
+	spin_unlock_irq(&current->sigmask_lock);
+
+	sprintf(current->comm, "xfssyncd");
+
+	vfsp->vfs_sync_task = current;
+	wmb();
+	wake_up(&vfsp->vfs_wait_sync_task);
+
+	for (;;) {
+		set_current_state(TASK_INTERRUPTIBLE);
+		schedule_timeout(xfs_syncd_interval);
+		if (vfsp->vfs_flag & VFS_UMOUNT)
+			break;
+		if (vfsp->vfs_flag & VFS_RDONLY)
+			continue;
+		VFS_SYNC(vfsp, SYNCD_FLAGS, NULL, error);
+	}
+
+	vfsp->vfs_sync_task = NULL;
+	wmb();
+	wake_up(&vfsp->vfs_wait_sync_task);
+
+	return 0;
+}
+
+STATIC int
+linvfs_start_syncd(vfs_t *vfsp)
+{
+	int pid;
+
+	pid = kernel_thread(syncd, (void *) vfsp,
+			CLONE_VM | CLONE_FS | CLONE_FILES);
+	if (pid < 0)
+		return pid;
+	wait_event(vfsp->vfs_wait_sync_task, vfsp->vfs_sync_task);
+	return 0;
+}
+
+STATIC void
+linvfs_stop_syncd(vfs_t *vfsp)
+{
+	vfsp->vfs_flag |= VFS_UMOUNT;
+	wmb();
+
+	wake_up_process(vfsp->vfs_sync_task);
+	wait_event(vfsp->vfs_wait_sync_task, !vfsp->vfs_sync_task);
+}
+
+STATIC void
+linvfs_put_super(
+	struct super_block	*sb)
+{
+	vfs_t			*vfsp = LINVFS_GET_VFS(sb);
+	int			error;
+
+	linvfs_stop_syncd(vfsp);
+	VFS_SYNC(vfsp, SYNC_ATTR|SYNC_DELWRI, NULL, error);
+	if (!error)
+		VFS_UNMOUNT(vfsp, 0, NULL, error);
+	if (error) {
+		printk("XFS unmount got error %d\n", error);
+		printk("%s: vfsp/0x%p left dangling!\n", __FUNCTION__, vfsp);
+		return;
+	}
+
+	vfs_deallocate(vfsp);
+}
+
+STATIC void
+linvfs_write_super(
+	struct super_block	*sb)
+{
+	vfs_t			*vfsp = LINVFS_GET_VFS(sb);
+	int			error;
+
+	if (sb->s_flags & MS_RDONLY) {
+		sb->s_dirt = 0; /* paranoia */
+		return;
+	}
+	/* Push the log and superblock a little */
+	VFS_SYNC(vfsp, SYNC_FSDATA, NULL, error);
+	sb->s_dirt = 0;
+}
+
+STATIC int
+linvfs_sync_super(
+	struct super_block	*sb)
+{
+	vfs_t		*vfsp = LINVFS_GET_VFS(sb);
+	int		error;
+
+	VFS_SYNC(vfsp, SYNC_FSDATA|SYNC_WAIT, NULL, error);
+	return -error;
+}
+
+STATIC int
+linvfs_statfs(
+	struct super_block	*sb,
+	struct statfs		*statp)
+{
+	vfs_t			*vfsp = LINVFS_GET_VFS(sb);
+	int			error;
+
+	VFS_STATVFS(vfsp, statp, NULL, error);
+	return -error;
+}
+
+STATIC int
+linvfs_remount(
+	struct super_block	*sb,
+	int			*flags,
+	char			*options)
+{
+	vfs_t			*vfsp = LINVFS_GET_VFS(sb);
+	struct xfs_mount_args	*args = xfs_args_allocate(sb);
+	int			error;
+
+	VFS_PARSEARGS(vfsp, options, args, 1, error);
+	if (!error)
+		VFS_MNTUPDATE(vfsp, flags, args, error);
+	kmem_free(args, sizeof(*args));
+	return -error;
+}
+
+STATIC void
+linvfs_freeze_fs(
+	struct super_block	*sb)
+{
+	vfs_t			*vfsp = LINVFS_GET_VFS(sb);
+	vnode_t			*vp;
+	int			error;
+
+	if (sb->s_flags & MS_RDONLY)
+		return;
+	VFS_ROOT(vfsp, &vp, error);
+	VOP_IOCTL(vp, LINVFS_GET_IP(vp), NULL, 0, XFS_IOC_FREEZE, 0, error);
+	VN_RELE(vp);
+}
+
+STATIC void
+linvfs_unfreeze_fs(
+	struct super_block	*sb)
+{
+	vfs_t			*vfsp = LINVFS_GET_VFS(sb);
+	vnode_t			*vp;
+	int			error;
+
+	VFS_ROOT(vfsp, &vp, error);
+	VOP_IOCTL(vp, LINVFS_GET_IP(vp), NULL, 0, XFS_IOC_THAW, 0, error);
+	VN_RELE(vp);
+}
+
+STATIC int
+linvfs_dentry_to_fh(
+	struct dentry		*dentry,
+	__u32			*data,
+	int			*lenp,
+	int			need_parent)
+{
+	struct inode		*inode = dentry->d_inode ;
+	vnode_t			*vp = LINVFS_GET_VP(inode);
+	int			maxlen = *lenp;
+	xfs_fid2_t		fid;
+	int			error;
+
+	if (maxlen < 3)
+		return 255 ;
+
+	VOP_FID2(vp, (struct fid *)&fid, error);
+	data[0] = (__u32)fid.fid_ino;	/* 32 bits of inode is OK */
+	data[1] = fid.fid_gen;
+
+	*lenp = 2 ;
+	if (maxlen < 4 || ! need_parent)
+		return 2 ;
+
+	inode = dentry->d_parent->d_inode ;
+	vp = LINVFS_GET_VP(inode);
+
+	VOP_FID2(vp, (struct fid *)&fid, error);
+	data[2] = (__u32)fid.fid_ino;	/* 32 bits of inode is OK */
+	*lenp = 3 ;
+	if (maxlen < 4)
+		return 3 ;
+	data[3] = fid.fid_gen;
+	*lenp = 4 ;
+	return 4 ;
+}
+
+STATIC struct dentry *
+linvfs_fh_to_dentry(
+	struct super_block	*sb,
+	__u32			*data,
+	int			len,
+	int			fhtype,
+	int			parent)
+{
+	vnode_t			*vp;
+	struct inode		*inode = NULL;
+	struct list_head	*lp;
+	struct dentry		*result;
+	xfs_fid2_t		xfid;
+	vfs_t			*vfsp = LINVFS_GET_VFS(sb);
+	int			error;
+
+	xfid.fid_len = sizeof(xfs_fid2_t) - sizeof(xfid.fid_len);
+	xfid.fid_pad = 0;
+
+	if (!parent) {
+		xfid.fid_gen = data[1];
+		xfid.fid_ino = (__u64)data[0];
+	} else {
+		if (fhtype == 4)
+			xfid.fid_gen = data[3];
+		else
+			xfid.fid_gen = 0;
+		xfid.fid_ino = (__u64)data[2];
+	}
+
+	VFS_VGET(vfsp, &vp, (fid_t *)&xfid, error);
+	if (error || vp == NULL)
+		return ERR_PTR(-ESTALE) ;
+
+	inode = LINVFS_GET_IP(vp);
+	spin_lock(&dcache_lock);
+	for (lp = inode->i_dentry.next; lp != &inode->i_dentry ; lp=lp->next) {
+		result = list_entry(lp,struct dentry, d_alias);
+		if (! (result->d_flags & DCACHE_NFSD_DISCONNECTED)) {
+			dget_locked(result);
+			result->d_vfs_flags |= DCACHE_REFERENCED;
+			spin_unlock(&dcache_lock);
+			iput(inode);
+			return result;
+		}
+	}
+	spin_unlock(&dcache_lock);
+	result = d_alloc_root(inode);
+	if (result == NULL) {
+		iput(inode);
+		return ERR_PTR(-ENOMEM);
+	}
+	result->d_flags |= DCACHE_NFSD_DISCONNECTED;
+	return result;
+}
+
+STATIC int
+linvfs_show_options(
+	struct seq_file		*m,
+	struct vfsmount		*mnt)
+{
+	struct vfs		*vfsp = LINVFS_GET_VFS(mnt->mnt_sb);
+	int			error;
+
+	VFS_SHOWARGS(vfsp, m, error);
+	return error;
+}
+
+STATIC int
+linvfs_getxstate(
+	struct super_block	*sb,
+	struct fs_quota_stat	*fqs)
+{
+	struct vfs		*vfsp = LINVFS_GET_VFS(sb);
+	int			error;
+
+	VFS_QUOTACTL(vfsp, Q_XGETQSTAT, 0, (caddr_t)fqs, error);
+	return -error;
+}
+
+STATIC int
+linvfs_setxstate(
+	struct super_block	*sb,
+	unsigned int		flags,
+	int			op)
+{
+	struct vfs		*vfsp = LINVFS_GET_VFS(sb);
+	int			error;
+
+	VFS_QUOTACTL(vfsp, op, 0, (caddr_t)&flags, error);
+	return -error;
+}
+
+STATIC int
+linvfs_getxquota(
+	struct super_block	*sb,
+	int			type,
+	qid_t			id,
+	struct fs_disk_quota	*fdq)
+{
+	struct vfs		*vfsp = LINVFS_GET_VFS(sb);
+	int			error, getmode;
+
+	getmode = (type == GRPQUOTA) ? Q_XGETGQUOTA : Q_XGETQUOTA;
+	VFS_QUOTACTL(vfsp, getmode, id, (caddr_t)fdq, error);
+	return -error;
+}
+
+STATIC int
+linvfs_setxquota(
+	struct super_block	*sb,
+	int			type,
+	qid_t			id,
+	struct fs_disk_quota	*fdq)
+{
+	struct vfs		*vfsp = LINVFS_GET_VFS(sb);
+	int			error, setmode;
+
+	setmode = (type == GRPQUOTA) ? Q_XSETGQLIM : Q_XSETQLIM;
+	VFS_QUOTACTL(vfsp, setmode, id, (caddr_t)fdq, error);
+	return -error;
+}
+
+STATIC struct super_block *
+linvfs_read_super(
+	struct super_block	*sb,
+	void			*data,
+	int			silent)
+{
+	vnode_t			*rootvp;
+	struct vfs		*vfsp = vfs_allocate();
+	struct xfs_mount_args	*args = xfs_args_allocate(sb);
+	struct statfs		statvfs;
+	int			error;
+
+	vfsp->vfs_super = sb;
+	LINVFS_SET_VFS(sb, vfsp);
+	if (sb->s_flags & MS_RDONLY)
+		vfsp->vfs_flag |= VFS_RDONLY;
+	bhv_insert_all_vfsops(vfsp);
+
+	VFS_PARSEARGS(vfsp, (char *)data, args, 0, error);
+	if (error) {
+		bhv_remove_all_vfsops(vfsp, 1);
+		goto fail_vfsop;
+	}
+
+	sb_min_blocksize(sb, BBSIZE);
+	sb->s_qcop = &linvfs_qops;
+	sb->s_op = &linvfs_sops;
+
+	VFS_MOUNT(vfsp, args, NULL, error);
+	if (error) {
+		bhv_remove_all_vfsops(vfsp, 1);
+		goto fail_vfsop;
+	}
+
+	VFS_STATVFS(vfsp, &statvfs, NULL, error);
+	if (error)
+		goto fail_unmount;
+
+	sb->s_dirt = 1;
+	sb->s_magic = statvfs.f_type;
+	sb->s_blocksize = statvfs.f_bsize;
+	sb->s_blocksize_bits = ffs(statvfs.f_bsize) - 1;
+	sb->s_maxbytes = xfs_max_file_offset(sb->s_blocksize_bits);
+	set_posix_acl_flag(sb);
+
+	VFS_ROOT(vfsp, &rootvp, error);
+	if (error)
+		goto fail_unmount;
+
+	sb->s_root = d_alloc_root(LINVFS_GET_IP(rootvp));
+	if (!sb->s_root)
+		goto fail_vnrele;
+	if (is_bad_inode(sb->s_root->d_inode))
+		goto fail_vnrele;
+	if (linvfs_start_syncd(vfsp))
+		goto fail_vnrele;
+	vn_trace_exit(rootvp, __FUNCTION__, (inst_t *)__return_address);
+
+	kmem_free(args, sizeof(*args));
+	return sb;
+
+fail_vnrele:
+	if (sb->s_root) {
+		dput(sb->s_root);
+		sb->s_root = NULL;
+	} else {
+		VN_RELE(rootvp);
+	}
+
+fail_unmount:
+	VFS_UNMOUNT(vfsp, 0, NULL, error);
+
+fail_vfsop:
+	vfs_deallocate(vfsp);
+	kmem_free(args, sizeof(*args));
+	return NULL;
+}
+
+
+STATIC struct super_operations linvfs_sops = {
+	.alloc_inode		= linvfs_alloc_inode,
+	.destroy_inode		= linvfs_destroy_inode,
+	.write_inode		= linvfs_write_inode,
+	.clear_inode		= linvfs_clear_inode,
+	.put_super		= linvfs_put_super,
+	.write_super		= linvfs_write_super,
+	.sync_fs		= linvfs_sync_super,
+	.write_super_lockfs	= linvfs_freeze_fs,
+	.unlockfs		= linvfs_unfreeze_fs,
+	.statfs			= linvfs_statfs,
+	.remount_fs		= linvfs_remount,
+	.fh_to_dentry		= linvfs_fh_to_dentry,
+	.dentry_to_fh		= linvfs_dentry_to_fh,
+	.show_options		= linvfs_show_options,
+};
+
+STATIC struct quotactl_ops linvfs_qops = {
+	.get_xstate		= linvfs_getxstate,
+	.set_xstate		= linvfs_setxstate,
+	.get_xquota		= linvfs_getxquota,
+	.set_xquota		= linvfs_setxquota,
+};
+
+STATIC struct file_system_type xfs_fs_type = {
+	.owner			= THIS_MODULE,
+	.name			= "xfs",
+	.read_super		= linvfs_read_super,
+	.fs_flags		= FS_REQUIRES_DEV,
+};
+
+
+STATIC int __init
+init_xfs_fs( void )
+{
+	int			error;
+	struct sysinfo		si;
+	static char		message[] __initdata = KERN_INFO \
+		XFS_VERSION_STRING " with " XFS_BUILD_OPTIONS " enabled\n";
+
+	printk(message);
+
+	si_meminfo(&si);
+	xfs_physmem = si.totalram;
+
+	ktrace_init(64);
+
+	error = init_inodecache();
+	if (error < 0)
+		goto undo_inodecache;
+
+	error = pagebuf_init();
+	if (error < 0)
+		goto undo_pagebuf;
+
+	vn_init();
+	xfs_init();
+	uuid_init();
+	vfs_initdmapi();
+	vfs_initquota();
+
+	error = register_filesystem(&xfs_fs_type);
+	if (error)
+		goto undo_register;
+	return 0;
+
+undo_register:
+	pagebuf_terminate();
+
+undo_pagebuf:
+	destroy_inodecache();
+
+undo_inodecache:
+	return error;
+}
+
+STATIC void __exit
+exit_xfs_fs( void )
+{
+	unregister_filesystem(&xfs_fs_type);
+	xfs_cleanup();
+	vfs_exitquota();
+	vfs_exitdmapi();
+	pagebuf_terminate();
+	destroy_inodecache();
+	ktrace_uninit();
+}
+
+module_init(init_xfs_fs);
+module_exit(exit_xfs_fs);
+
+MODULE_AUTHOR("Silicon Graphics, Inc.");
+MODULE_DESCRIPTION(XFS_VERSION_STRING " with " XFS_BUILD_OPTIONS " enabled");
+MODULE_LICENSE("GPL");
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)