/* * Copyright (c) 2000-2004 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/namei.h>#include <linux/init.h>#include <linux/mount.h>#include <linux/suspend.h>#include <linux/writeback.h>STATIC struct quotactl_ops linvfs_qops;STATIC struct super_operations linvfs_sops;STATIC struct export_operations linvfs_export_ops;STATIC kmem_zone_t *linvfs_inode_zone;STATIC kmem_shaker_t xfs_inode_shaker;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, sb->s_id, 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_txfs_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# if defined(CONFIG_LBD)	ASSERT(sizeof(sector_t) == 8);	pagefactor = PAGE_CACHE_SIZE;	bitshift = BITS_PER_LONG;# else	pagefactor = PAGE_CACHE_SIZE >> (PAGE_CACHE_SHIFT - blockshift);# endif#endif	return (((__uint64_t)pagefactor) << bitshift) - 1;}STATIC __inline__ voidxfs_set_inodeops(	struct inode		*inode){	vnode_t			*vp = LINVFS_GET_VP(inode);	if (vp->v_type == VNON) {		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, inode->i_rdev);	}}STATIC __inline__ voidxfs_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 = 0;	} else {		xfs_dev_t dev = ip->i_df.if_u2.if_rdev;		inode->i_rdev = MKDEV(sysv_major(dev) & 0x1ff, sysv_minor(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.tv_sec	= ip->i_d.di_atime.t_sec;	inode->i_atime.tv_nsec	= ip->i_d.di_atime.t_nsec;	inode->i_mtime.tv_sec	= ip->i_d.di_mtime.t_sec;	inode->i_mtime.tv_nsec	= ip->i_d.di_mtime.t_nsec;	inode->i_ctime.tv_sec	= ip->i_d.di_ctime.t_sec;	inode->i_ctime.tv_nsec	= ip->i_d.di_ctime.t_nsec;	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;}voidxfs_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);	}}voidxfs_flush_inode(	xfs_inode_t	*ip){	struct inode	*inode = LINVFS_GET_IP(XFS_ITOV(ip));	filemap_flush(inode->i_mapping);}voidxfs_flush_device(	xfs_inode_t	*ip){	sync_blockdev(XFS_ITOV(ip)->v_vfsp->vfs_super->s_bdev);	xfs_log_force(ip->i_mount, (xfs_lsn_t)0, XFS_LOG_FORCE|XFS_LOG_SYNC);}intxfs_blkdev_get(	xfs_mount_t		*mp,	const char		*name,	struct block_device	**bdevp){	int			error = 0;	*bdevp = open_bdev_excl(name, 0, mp);	if (IS_ERR(*bdevp)) {		error = PTR_ERR(*bdevp);		printk("XFS: Invalid device [%s], error=%d\n", name, error);	}	return -error;}voidxfs_blkdev_put(	struct block_device	*bdev){	if (bdev)		close_bdev_excl(bdev);}STATIC struct inode *linvfs_alloc_inode(	struct super_block	*sb){	vnode_t			*vp;	vp = (vnode_t *)kmem_cache_alloc(linvfs_inode_zone,                 kmem_flags_convert(KM_SLEEP));	if (!vp)		return NULL;	return LINVFS_GET_IP(vp);}STATIC voidlinvfs_destroy_inode(	struct inode		*inode){	kmem_cache_free(linvfs_inode_zone, LINVFS_GET_VP(inode));}intxfs_inode_shake(	int		priority,	unsigned int	gfp_mask){	int		pages;		pages = kmem_zone_shrink(linvfs_inode_zone);	pages += kmem_zone_shrink(xfs_inode_zone);	return pages;}STATIC voidinit_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)		inode_init_once(LINVFS_GET_IP(vp));}STATIC intinit_inodecache( void ){	linvfs_inode_zone = kmem_cache_create("linvfs_icache",				sizeof(vnode_t), 0,				SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT,				init_once, NULL);	if (linvfs_inode_zone == NULL)		return -ENOMEM;	return 0;}STATIC voiddestroy_inodecache( void ){	if (kmem_cache_destroy(linvfs_inode_zone))		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 voidlinvfs_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 voidlinvfs_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)STATIC intxfssyncd(	void			*arg){	vfs_t			*vfsp = (vfs_t *) arg;	int			error;	daemonize("xfssyncd");	vfsp->vfs_sync_task = current;	wmb();	wake_up(&vfsp->vfs_wait_sync_task);	for (;;) {		set_current_state(TASK_INTERRUPTIBLE);		schedule_timeout((xfs_syncd_centisecs * HZ) / 100);		/* swsusp */		if (current->flags & PF_FREEZE)			refrigerator(PF_FREEZE);		if (vfsp->vfs_flag & VFS_UMOUNT)			break;		if (vfsp->vfs_flag & VFS_RDONLY)			continue;		VFS_SYNC(vfsp, SYNCD_FLAGS, NULL, error);		vfsp->vfs_sync_seq++;		wmb();		wake_up(&vfsp->vfs_wait_single_sync_task);	}	vfsp->vfs_sync_task = NULL;	wmb();	wake_up(&vfsp->vfs_wait_sync_task);	return 0;}STATIC intlinvfs_start_syncd(	vfs_t			*vfsp){	int			pid;	pid = kernel_thread(xfssyncd, (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 voidlinvfs_stop_syncd(	vfs_t			*vfsp){	vfsp->vfs_flag |= VFS_UMOUNT;