Release 4.11 fs/xfs/xfs_export.c

/*
 * Copyright (c) 2004-2005 Silicon Graphics, Inc.
 * All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms 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.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write the Free Software Foundation,
 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
#include "xfs.h"
#include "xfs_format.h"
#include "xfs_log_format.h"
#include "xfs_trans_resv.h"
#include "xfs_mount.h"
#include "xfs_da_format.h"
#include "xfs_da_btree.h"
#include "xfs_dir2.h"
#include "xfs_export.h"
#include "xfs_inode.h"
#include "xfs_trans.h"
#include "xfs_inode_item.h"
#include "xfs_trace.h"
#include "xfs_icache.h"
#include "xfs_log.h"
#include "xfs_pnfs.h"

/*
 * Note that we only accept fileids which are long enough rather than allow
 * the parent generation number to default to zero.  XFS considers zero a
 * valid generation number not an invalid/wildcard value.
 */


static int xfs_fileid_length(int fileid_type)
{
	switch (fileid_type) {
	case FILEID_INO32_GEN:
		return 2;
	case FILEID_INO32_GEN_PARENT:
		return 4;
	case FILEID_INO32_GEN | XFS_FILEID_TYPE_64FLAG:
		return 3;
	case FILEID_INO32_GEN_PARENT | XFS_FILEID_TYPE_64FLAG:
		return 6;
	}
	return FILEID_INVALID;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Hellwig
45
97.83%
1
50.00%
Namjae Jeon
1
2.17%
1
50.00%
Total
46
100.00%
2
100.00%


STATIC int

xfs_fs_encode_fh(
	struct inode	*inode,
	__u32		*fh,
	int		*max_len,
	struct inode	*parent)
{
	struct fid		*fid = (struct fid *)fh;
	struct xfs_fid64	*fid64 = (struct xfs_fid64 *)fh;
	int			fileid_type;
	int			len;

	/* Directories don't need their parent encoded, they have ".." */
	if (!parent)
		fileid_type = FILEID_INO32_GEN;
	else
		fileid_type = FILEID_INO32_GEN_PARENT;

	/*
         * If the the filesystem may contain 64bit inode numbers, we need
         * to use larger file handles that can represent them.
         *
         * While we only allocate inodes that do not fit into 32 bits any
         * large enough filesystem may contain them, thus the slightly
         * confusing looking conditional below.
         */
	if (!(XFS_M(inode->i_sb)->m_flags & XFS_MOUNT_SMALL_INUMS) ||
	    (XFS_M(inode->i_sb)->m_flags & XFS_MOUNT_32BITINODES))
		fileid_type |= XFS_FILEID_TYPE_64FLAG;

	/*
         * Only encode if there is enough space given.  In practice
         * this means we can't export a filesystem with 64bit inodes
         * over NFSv2 with the subtree_check export option; the other
         * seven combinations work.  The real answer is "don't use v2".
         */
	len = xfs_fileid_length(fileid_type);
	if (*max_len < len) {
		*max_len = len;
		return FILEID_INVALID;
	}
	*max_len = len;

	switch (fileid_type) {
	case FILEID_INO32_GEN_PARENT:
		fid->i32.parent_ino = XFS_I(parent)->i_ino;
		fid->i32.parent_gen = parent->i_generation;
		/*FALLTHRU*/
	case FILEID_INO32_GEN:
		fid->i32.ino = XFS_I(inode)->i_ino;
		fid->i32.gen = inode->i_generation;
		break;
	case FILEID_INO32_GEN_PARENT | XFS_FILEID_TYPE_64FLAG:
		fid64->parent_ino = XFS_I(parent)->i_ino;
		fid64->parent_gen = parent->i_generation;
		/*FALLTHRU*/
	case FILEID_INO32_GEN | XFS_FILEID_TYPE_64FLAG:
		fid64->ino = XFS_I(inode)->i_ino;
		fid64->gen = inode->i_generation;
		break;
	}

	return fileid_type;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Hellwig
195
79.27%
4
40.00%
Greg Banks
16
6.50%
1
10.00%
Samuel Kvasnica
14
5.69%
1
10.00%
Al Viro
11
4.47%
1
10.00%
Aneesh Kumar K.V
7
2.85%
1
10.00%
David Chinner
2
0.81%
1
10.00%
Namjae Jeon
1
0.41%
1
10.00%
Total
246
100.00%
10
100.00%


STATIC struct inode *

xfs_nfs_get_inode(
	struct super_block	*sb,
	u64			ino,
	u32			generation)
 {
 	xfs_mount_t		*mp = XFS_M(sb);
	xfs_inode_t		*ip;
	int			error;

	/*
         * NFS can sometimes send requests for ino 0.  Fail them gracefully.
         */
	if (ino == 0)
		return ERR_PTR(-ESTALE);

	/*
         * The XFS_IGET_UNTRUSTED means that an invalid inode number is just
         * fine and not an indication of a corrupted filesystem as clients can
         * send invalid file handles and we have to handle it gracefully..
         */
	error = xfs_iget(mp, NULL, ino, XFS_IGET_UNTRUSTED, 0, &ip);
	if (error) {
		/*
                 * EINVAL means the inode cluster doesn't exist anymore.
                 * This implies the filehandle is stale, so we should
                 * translate it here.
                 * We don't use ESTALE directly down the chain to not
                 * confuse applications using bulkstat that expect EINVAL.
                 */
		if (error == -EINVAL || error == -ENOENT)
			error = -ESTALE;
		return ERR_PTR(error);
	}

	if (VFS_I(ip)->i_generation != generation) {
		IRELE(ip);
		return ERR_PTR(-ESTALE);
	}

	return VFS_I(ip);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Hellwig
112
86.82%
5
50.00%
Dave Chinner
9
6.98%
3
30.00%
J. Bruce Fields
5
3.88%
1
10.00%
David Chinner
3
2.33%
1
10.00%
Total
129
100.00%
10
100.00%


STATIC struct dentry *

xfs_fs_fh_to_dentry(struct super_block *sb, struct fid *fid,
		 int fh_len, int fileid_type)
{
	struct xfs_fid64	*fid64 = (struct xfs_fid64 *)fid;
	struct inode		*inode = NULL;

	if (fh_len < xfs_fileid_length(fileid_type))
		return NULL;

	switch (fileid_type) {
	case FILEID_INO32_GEN_PARENT:
	case FILEID_INO32_GEN:
		inode = xfs_nfs_get_inode(sb, fid->i32.ino, fid->i32.gen);
		break;
	case FILEID_INO32_GEN_PARENT | XFS_FILEID_TYPE_64FLAG:
	case FILEID_INO32_GEN | XFS_FILEID_TYPE_64FLAG:
		inode = xfs_nfs_get_inode(sb, fid64->ino, fid64->gen);
		break;
	}

	return d_obtain_alias(inode);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Hellwig
83
69.75%
4
80.00%
Greg Banks
36
30.25%
1
20.00%
Total
119
100.00%
5
100.00%


STATIC struct dentry *

xfs_fs_fh_to_parent(struct super_block *sb, struct fid *fid,
		 int fh_len, int fileid_type)
{
	struct xfs_fid64	*fid64 = (struct xfs_fid64 *)fid;
	struct inode		*inode = NULL;

	if (fh_len < xfs_fileid_length(fileid_type))
		return NULL;

	switch (fileid_type) {
	case FILEID_INO32_GEN_PARENT:
		inode = xfs_nfs_get_inode(sb, fid->i32.parent_ino,
					      fid->i32.parent_gen);
		break;
	case FILEID_INO32_GEN_PARENT | XFS_FILEID_TYPE_64FLAG:
		inode = xfs_nfs_get_inode(sb, fid64->parent_ino,
					      fid64->parent_gen);
		break;
	}

	return d_obtain_alias(inode);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Hellwig
97
87.39%
4
57.14%
Hugh Dickins
12
10.81%
1
14.29%
Nathan Scott
1
0.90%
1
14.29%
Greg Banks
1
0.90%
1
14.29%
Total
111
100.00%
7
100.00%


STATIC struct dentry *

xfs_fs_get_parent(
	struct dentry		*child)
{
	int			error;
	struct xfs_inode	*cip;

	error = xfs_lookup(XFS_I(d_inode(child)), &xfs_name_dotdot, &cip, NULL);
	if (unlikely(error))
		return ERR_PTR(error);

	return d_obtain_alias(VFS_I(cip));
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Hellwig
54
84.38%
4
44.44%
Barry Naujok
3
4.69%
2
22.22%
David Chinner
3
4.69%
1
11.11%
David Howells
3
4.69%
1
11.11%
Nathan Scott
1
1.56%
1
11.11%
Total
64
100.00%
9
100.00%


STATIC int

xfs_fs_nfs_commit_metadata(
	struct inode		*inode)
{
	struct xfs_inode	*ip = XFS_I(inode);
	struct xfs_mount	*mp = ip->i_mount;
	xfs_lsn_t		lsn = 0;

	xfs_ilock(ip, XFS_ILOCK_SHARED);
	if (xfs_ipincount(ip))
		lsn = ip->i_itemp->ili_last_lsn;
	xfs_iunlock(ip, XFS_ILOCK_SHARED);

	if (!lsn)
		return 0;
	return _xfs_log_force_lsn(mp, lsn, XFS_LOG_SYNC, NULL);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Ben Myers
63
75.00%
1
50.00%
Christoph Hellwig
21
25.00%
1
50.00%
Total
84
100.00%
2
100.00%


const struct export_operations xfs_export_operations = {
	.encode_fh		= xfs_fs_encode_fh,
	.fh_to_dentry		= xfs_fs_fh_to_dentry,
	.fh_to_parent		= xfs_fs_fh_to_parent,
	.get_parent		= xfs_fs_get_parent,
	.commit_metadata	= xfs_fs_nfs_commit_metadata,
#ifdef CONFIG_EXPORTFS_BLOCK_OPS
	.get_uuid		= xfs_fs_get_uuid,
	.map_blocks		= xfs_fs_map_blocks,
	.commit_blocks		= xfs_fs_commit_blocks,
#endif
};
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Hellwig
663
73.50%
15
36.59%
Ben Myers
71
7.87%
1
2.44%
Greg Banks
65
7.21%
1
2.44%
Dave Chinner
31
3.44%
9
21.95%
Samuel Kvasnica
14
1.55%
1
2.44%
Hugh Dickins
12
1.33%
1
2.44%
Al Viro
11
1.22%
1
2.44%
David Chinner
8
0.89%
2
4.88%
Aneesh Kumar K.V
7
0.78%
1
2.44%
J. Bruce Fields
5
0.55%
1
2.44%
Barry Naujok
5
0.55%
2
4.88%
Nathan Scott
4
0.44%
3
7.32%
David Howells
3
0.33%
1
2.44%
Namjae Jeon
2
0.22%
1
2.44%
Benjamin Coddington
1
0.11%
1
2.44%
Total
902
100.00%
41
100.00%
Directory: fs/xfs

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.