xfs_vfsops.c

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/*
 * XFS filesystem operations.
 *
 * 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_macros.h"
#include "xfs_types.h"
#include "xfs_inum.h"
#include "xfs_log.h"
#include "xfs_trans.h"
#include "xfs_sb.h"
#include "xfs_dir.h"
#include "xfs_dir2.h"
#include "xfs_dmapi.h"
#include "xfs_mount.h"
#include "xfs_bmap_btree.h"
#include "xfs_ialloc_btree.h"
#include "xfs_alloc_btree.h"
#include "xfs_btree.h"
#include "xfs_alloc.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_item.h"
#include "xfs_inode.h"
#include "xfs_ag.h"
#include "xfs_error.h"
#include "xfs_bmap.h"
#include "xfs_da_btree.h"
#include "xfs_rw.h"
#include "xfs_refcache.h"
#include "xfs_buf_item.h"
#include "xfs_extfree_item.h"
#include "xfs_quota.h"
#include "xfs_dir2_trace.h"
#include "xfs_acl.h"
#include "xfs_attr.h"
#include "xfs_clnt.h"
#include "xfs_log_priv.h"

STATIC int xfs_sync(bhv_desc_t *, int, cred_t *);

int
xfs_init(void)
{
	extern kmem_zone_t	*xfs_bmap_free_item_zone;
	extern kmem_zone_t	*xfs_btree_cur_zone;
	extern kmem_zone_t	*xfs_trans_zone;
	extern kmem_zone_t	*xfs_buf_item_zone;
	extern kmem_zone_t	*xfs_dabuf_zone;
#ifdef XFS_DABUF_DEBUG
	extern lock_t	        xfs_dabuf_global_lock;
	spinlock_init(&xfs_dabuf_global_lock, "xfsda");
#endif

	/*
	 * Initialize all of the zone allocators we use.
	 */
	xfs_bmap_free_item_zone = kmem_zone_init(sizeof(xfs_bmap_free_item_t),
						 "xfs_bmap_free_item");
	xfs_btree_cur_zone = kmem_zone_init(sizeof(xfs_btree_cur_t),
					    "xfs_btree_cur");
	xfs_inode_zone = kmem_zone_init(sizeof(xfs_inode_t), "xfs_inode");
	xfs_trans_zone = kmem_zone_init(sizeof(xfs_trans_t), "xfs_trans");
	xfs_da_state_zone =
		kmem_zone_init(sizeof(xfs_da_state_t), "xfs_da_state");
	xfs_dabuf_zone = kmem_zone_init(sizeof(xfs_dabuf_t), "xfs_dabuf");

	/*
	 * The size of the zone allocated buf log item is the maximum
	 * size possible under XFS.  This wastes a little bit of memory,
	 * but it is much faster.
	 */
	xfs_buf_item_zone =
		kmem_zone_init((sizeof(xfs_buf_log_item_t) +
				(((XFS_MAX_BLOCKSIZE / XFS_BLI_CHUNK) /
				  NBWORD) * sizeof(int))),
			       "xfs_buf_item");
	xfs_efd_zone = kmem_zone_init((sizeof(xfs_efd_log_item_t) +
				       ((XFS_EFD_MAX_FAST_EXTENTS - 1) * sizeof(xfs_extent_t))),
				      "xfs_efd_item");
	xfs_efi_zone = kmem_zone_init((sizeof(xfs_efi_log_item_t) +
				       ((XFS_EFI_MAX_FAST_EXTENTS - 1) * sizeof(xfs_extent_t))),
				      "xfs_efi_item");
	xfs_ifork_zone = kmem_zone_init(sizeof(xfs_ifork_t), "xfs_ifork");
	xfs_ili_zone = kmem_zone_init(sizeof(xfs_inode_log_item_t), "xfs_ili");
	xfs_chashlist_zone = kmem_zone_init(sizeof(xfs_chashlist_t),
					    "xfs_chashlist");
	xfs_acl_zone_init(xfs_acl_zone, "xfs_acl");

	/*
	 * Allocate global trace buffers.
	 */
#ifdef XFS_ALLOC_TRACE
	xfs_alloc_trace_buf = ktrace_alloc(XFS_ALLOC_TRACE_SIZE, KM_SLEEP);
#endif
#ifdef XFS_BMAP_TRACE
	xfs_bmap_trace_buf = ktrace_alloc(XFS_BMAP_TRACE_SIZE, KM_SLEEP);
#endif
#ifdef XFS_BMBT_TRACE
	xfs_bmbt_trace_buf = ktrace_alloc(XFS_BMBT_TRACE_SIZE, KM_SLEEP);
#endif
#ifdef XFS_DIR_TRACE
	xfs_dir_trace_buf = ktrace_alloc(XFS_DIR_TRACE_SIZE, KM_SLEEP);
#endif
#ifdef XFS_ATTR_TRACE
	xfs_attr_trace_buf = ktrace_alloc(XFS_ATTR_TRACE_SIZE, KM_SLEEP);
#endif
#ifdef XFS_DIR2_TRACE
	xfs_dir2_trace_buf = ktrace_alloc(XFS_DIR2_GTRACE_SIZE, KM_SLEEP);
#endif

	xfs_dir_startup();

#if (defined(DEBUG) || defined(INDUCE_IO_ERROR))
	xfs_error_test_init();
#endif /* DEBUG || INDUCE_IO_ERROR */

	xfs_init_procfs();
	xfs_sysctl_register();
	return 0;
}

void
xfs_cleanup(void)
{
	extern kmem_zone_t	*xfs_bmap_free_item_zone;
	extern kmem_zone_t	*xfs_btree_cur_zone;
	extern kmem_zone_t	*xfs_inode_zone;
	extern kmem_zone_t	*xfs_trans_zone;
	extern kmem_zone_t	*xfs_da_state_zone;
	extern kmem_zone_t	*xfs_dabuf_zone;
	extern kmem_zone_t	*xfs_efd_zone;
	extern kmem_zone_t	*xfs_efi_zone;
	extern kmem_zone_t	*xfs_buf_item_zone;
	extern kmem_zone_t	*xfs_chashlist_zone;

	xfs_cleanup_procfs();
	xfs_sysctl_unregister();
	xfs_refcache_destroy();
	xfs_acl_zone_destroy(xfs_acl_zone);

#ifdef XFS_DIR2_TRACE
	ktrace_free(xfs_dir2_trace_buf);
#endif
#ifdef XFS_ATTR_TRACE
	ktrace_free(xfs_attr_trace_buf);
#endif
#ifdef XFS_DIR_TRACE
	ktrace_free(xfs_dir_trace_buf);
#endif
#ifdef XFS_BMBT_TRACE
	ktrace_free(xfs_bmbt_trace_buf);
#endif
#ifdef XFS_BMAP_TRACE
	ktrace_free(xfs_bmap_trace_buf);
#endif
#ifdef XFS_ALLOC_TRACE
	ktrace_free(xfs_alloc_trace_buf);
#endif

	kmem_cache_destroy(xfs_bmap_free_item_zone);
	kmem_cache_destroy(xfs_btree_cur_zone);
	kmem_cache_destroy(xfs_inode_zone);
	kmem_cache_destroy(xfs_trans_zone);
	kmem_cache_destroy(xfs_da_state_zone);
	kmem_cache_destroy(xfs_dabuf_zone);
	kmem_cache_destroy(xfs_buf_item_zone);
	kmem_cache_destroy(xfs_efd_zone);
	kmem_cache_destroy(xfs_efi_zone);
	kmem_cache_destroy(xfs_ifork_zone);
	kmem_cache_destroy(xfs_ili_zone);
	kmem_cache_destroy(xfs_chashlist_zone);
}

/*
 * xfs_start_flags
 *
 * This function fills in xfs_mount_t fields based on mount args.
 * Note: the superblock has _not_ yet been read in.
 */
STATIC int
xfs_start_flags(
	struct vfs		*vfs,
	struct xfs_mount_args	*ap,
	struct xfs_mount	*mp)
{
	/* Values are in BBs */
	if ((ap->flags & XFSMNT_NOALIGN) != XFSMNT_NOALIGN) {
		/*
		 * At this point the superblock has not been read
		 * in, therefore we do not know the block size.
		 * Before the mount call ends we will convert
		 * these to FSBs.
		 */
		mp->m_dalign = ap->sunit;
		mp->m_swidth = ap->swidth;
	}

	if (ap->logbufs != -1 &&
#if defined(DEBUG) || defined(XLOG_NOLOG)
	    ap->logbufs != 0 &&
#endif
	    (ap->logbufs < XLOG_MIN_ICLOGS ||
	     ap->logbufs > XLOG_MAX_ICLOGS)) {
		cmn_err(CE_WARN,
			"XFS: invalid logbufs value: %d [not %d-%d]",
			ap->logbufs, XLOG_MIN_ICLOGS, XLOG_MAX_ICLOGS);
		return XFS_ERROR(EINVAL);
	}
	mp->m_logbufs = ap->logbufs;
	if (ap->logbufsize != -1 &&
	    ap->logbufsize != 16 * 1024 &&
	    ap->logbufsize != 32 * 1024 &&
	    ap->logbufsize != 64 * 1024 &&
	    ap->logbufsize != 128 * 1024 &&
	    ap->logbufsize != 256 * 1024) {
		cmn_err(CE_WARN,
	"XFS: invalid logbufsize: %d [not 16k,32k,64k,128k or 256k]",
			ap->logbufsize);
		return XFS_ERROR(EINVAL);
	}
	mp->m_logbsize = ap->logbufsize;
	mp->m_fsname_len = strlen(ap->fsname) + 1;
	mp->m_fsname = kmem_alloc(mp->m_fsname_len, KM_SLEEP);
	strcpy(mp->m_fsname, ap->fsname);

	/*
	 * Pull in the 'wsync' and 'ino64' mount options before we do the real
	 * work of mounting and recovery.  The arg pointer will
	 * be NULL when we are being called from the root mount code.
	 */
	if (ap->flags & XFSMNT_WSYNC)
		mp->m_flags |= XFS_MOUNT_WSYNC;
#if XFS_BIG_INUMS
	if (ap->flags & XFSMNT_INO64) {
		mp->m_flags |= XFS_MOUNT_INO64;
		mp->m_inoadd = XFS_INO64_OFFSET;
	}
#endif
	if (ap->flags & XFSMNT_NOATIME)
		mp->m_flags |= XFS_MOUNT_NOATIME;

	if (ap->flags & XFSMNT_RETERR)
		mp->m_flags |= XFS_MOUNT_RETERR;

	if (ap->flags & XFSMNT_NOALIGN)
		mp->m_flags |= XFS_MOUNT_NOALIGN;

	if (ap->flags & XFSMNT_SWALLOC)
		mp->m_flags |= XFS_MOUNT_SWALLOC;

	if (ap->flags & XFSMNT_OSYNCISOSYNC)
		mp->m_flags |= XFS_MOUNT_OSYNCISOSYNC;

	if (ap->flags & XFSMNT_32BITINODES)
		mp->m_flags |= (XFS_MOUNT_32BITINODES | XFS_MOUNT_32BITINOOPT);

	if (ap->flags & XFSMNT_IOSIZE) {
		if (ap->iosizelog > XFS_MAX_IO_LOG ||
		    ap->iosizelog < XFS_MIN_IO_LOG) {
			cmn_err(CE_WARN,
		"XFS: invalid log iosize: %d [not %d-%d]",
				ap->iosizelog, XFS_MIN_IO_LOG,
				XFS_MAX_IO_LOG);
			return XFS_ERROR(EINVAL);
		}

		mp->m_flags |= XFS_MOUNT_DFLT_IOSIZE;
		mp->m_readio_log = mp->m_writeio_log = ap->iosizelog;
	}
	if (ap->flags & XFSMNT_IDELETE)
		mp->m_flags |= XFS_MOUNT_IDELETE;

	/*
	 * no recovery flag requires a read-only mount
	 */
	if (ap->flags & XFSMNT_NORECOVERY) {
		if (!(vfs->vfs_flag & VFS_RDONLY)) {
			cmn_err(CE_WARN,
	"XFS: tried to mount a FS read-write without recovery!");
			return XFS_ERROR(EINVAL);
		}
		mp->m_flags |= XFS_MOUNT_NORECOVERY;
	}

	if (ap->flags & XFSMNT_NOUUID)
		mp->m_flags |= XFS_MOUNT_NOUUID;
	if (ap->flags & XFSMNT_NOLOGFLUSH)
		mp->m_flags |= XFS_MOUNT_NOLOGFLUSH;

	return 0;
}

/*
 * This function fills in xfs_mount_t fields based on mount args.
 * Note: the superblock _has_ now been read in.
 */
STATIC int
xfs_finish_flags(
	struct vfs		*vfs,
	struct xfs_mount_args	*ap,
	struct xfs_mount	*mp)
{
	int			ronly = (vfs->vfs_flag & VFS_RDONLY);

	/* Fail a mount where the logbuf is smaller then the log stripe */
	if (XFS_SB_VERSION_HASLOGV2(&mp->m_sb)) {
		if ((ap->logbufsize == -1) &&
		    (mp->m_sb.sb_logsunit > XLOG_BIG_RECORD_BSIZE)) {
			mp->m_logbsize = mp->m_sb.sb_logsunit;
		} else if (ap->logbufsize < mp->m_sb.sb_logsunit) {
			cmn_err(CE_WARN,
	"XFS: logbuf size must be greater than or equal to log stripe size");
			return XFS_ERROR(EINVAL);
		}
	} else {
		/* Fail a mount if the logbuf is larger than 32K */
		if (ap->logbufsize > XLOG_BIG_RECORD_BSIZE) {
			cmn_err(CE_WARN,
	"XFS: logbuf size for version 1 logs must be 16K or 32K");
			return XFS_ERROR(EINVAL);
		}
	}

	/*
	 * prohibit r/w mounts of read-only filesystems
	 */
	if ((mp->m_sb.sb_flags & XFS_SBF_READONLY) && !ronly) {
		cmn_err(CE_WARN,
	"XFS: cannot mount a read-only filesystem as read-write");
		return XFS_ERROR(EROFS);
	}

	/*
	 * disallow mount attempts with (IRIX) project quota enabled
	 */
	if (XFS_SB_VERSION_HASQUOTA(&mp->m_sb) &&
	    (mp->m_sb.sb_qflags & XFS_PQUOTA_ACCT)) {
		cmn_err(CE_WARN,
	"XFS: cannot mount a filesystem with IRIX project quota enabled");
		return XFS_ERROR(ENOSYS);
	}

	/*
	 * check for shared mount.
	 */
	if (ap->flags & XFSMNT_SHARED) {
		if (!XFS_SB_VERSION_HASSHARED(&mp->m_sb))
			return XFS_ERROR(EINVAL);

		/*
		 * For IRIX 6.5, shared mounts must have the shared
		 * version bit set, have the persistent readonly
		 * field set, must be version 0 and can only be mounted
		 * read-only.
		 */
		if (!ronly || !(mp->m_sb.sb_flags & XFS_SBF_READONLY) ||
		     (mp->m_sb.sb_shared_vn != 0))
			return XFS_ERROR(EINVAL);

		mp->m_flags |= XFS_MOUNT_SHARED;

		/*
		 * Shared XFS V0 can't deal with DMI.  Return EINVAL.
		 */
		if (mp->m_sb.sb_shared_vn == 0 && (ap->flags & XFSMNT_DMAPI))
			return XFS_ERROR(EINVAL);
	}

	return 0;
}

/*
 * xfs_mount
 *
 * The file system configurations are:
 *	(1) device (partition) with data and internal log
 *	(2) logical volume with data and log subvolumes.
 *	(3) logical volume with data, log, and realtime subvolumes.
 *
 * We only have to handle opening the log and realtime volumes here if
 * they are present.  The data subvolume has already been opened by
 * get_sb_bdev() and is stored in vfsp->vfs_super->s_bdev.
 */
STATIC int
xfs_mount(
	struct bhv_desc		*bhvp,
	struct xfs_mount_args	*args,
	cred_t			*credp)
{
	struct vfs		*vfsp = bhvtovfs(bhvp);
	struct bhv_desc		*p;
	struct xfs_mount	*mp = XFS_BHVTOM(bhvp);
	struct block_device	*ddev, *logdev, *rtdev;
	int			flags = 0, error;

	ddev = vfsp->vfs_super->s_bdev;
	logdev = rtdev = NULL;

	/*
	 * Setup xfs_mount function vectors from available behaviors
	 */
	p = vfs_bhv_lookup(vfsp, VFS_POSITION_DM);
	mp->m_dm_ops = p ? *(xfs_dmops_t *) vfs_bhv_custom(p) : xfs_dmcore_stub;
	p = vfs_bhv_lookup(vfsp, VFS_POSITION_QM);
	mp->m_qm_ops = p ? *(xfs_qmops_t *) vfs_bhv_custom(p) : xfs_qmcore_stub;
	p = vfs_bhv_lookup(vfsp, VFS_POSITION_IO);
	mp->m_io_ops = p ? *(xfs_ioops_t *) vfs_bhv_custom(p) : xfs_iocore_xfs;

	/*
	 * Open real time and log devices - order is important.
	 */
	if (args->logname[0]) {
		error = xfs_blkdev_get(mp, args->logname, &logdev);
		if (error)
			return error;
	}
	if (args->rtname[0]) {
		error = xfs_blkdev_get(mp, args->rtname, &rtdev);
		if (error) {
			xfs_blkdev_put(logdev);
			return error;
		}

		if (rtdev == ddev || rtdev == logdev) {
			cmn_err(CE_WARN,
	"XFS: Cannot mount filesystem with identical rtdev and ddev/logdev.");
			xfs_blkdev_put(logdev);
			xfs_blkdev_put(rtdev);
			return EINVAL;
		}
	}

	/*
	 * Setup xfs_mount buffer target pointers
	 */
	error = ENOMEM;
	mp->m_ddev_targp = xfs_alloc_buftarg(ddev);
	if (!mp->m_ddev_targp) {
		xfs_blkdev_put(logdev);
		xfs_blkdev_put(rtdev);
		return error;
	}
	if (rtdev) {
		mp->m_rtdev_targp = xfs_alloc_buftarg(rtdev);
		if (!mp->m_rtdev_targp)
			goto error0;
	}
	mp->m_logdev_targp = (logdev && logdev != ddev) ?