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![Christoph Hellwig](/assets/img/avatar_default.png)
Now that nfsd has stopped writing to the find_exported_dentry member we an mark the export_operations const Signed-off-by: Christoph Hellwig <hch@lst.de> Cc: Neil Brown <neilb@suse.de> Cc: "J. Bruce Fields" <bfields@fieldses.org> Cc: <linux-ext4@vger.kernel.org> Cc: Dave Kleikamp <shaggy@austin.ibm.com> Cc: Anton Altaparmakov <aia21@cantab.net> Cc: David Chinner <dgc@sgi.com> Cc: Timothy Shimmin <tes@sgi.com> Cc: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> Cc: Hugh Dickins <hugh@veritas.com> Cc: Chris Mason <mason@suse.com> Cc: Jeff Mahoney <jeffm@suse.com> Cc: "Vladimir V. Saveliev" <vs@namesys.com> Cc: Steven Whitehouse <swhiteho@redhat.com> Cc: Mark Fasheh <mark.fasheh@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
228 lines
5.7 KiB
C
228 lines
5.7 KiB
C
/*
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* Copyright (c) 2004-2005 Silicon Graphics, Inc.
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* All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "xfs.h"
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#include "xfs_types.h"
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#include "xfs_inum.h"
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#include "xfs_log.h"
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#include "xfs_trans.h"
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#include "xfs_sb.h"
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#include "xfs_ag.h"
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#include "xfs_dmapi.h"
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#include "xfs_mount.h"
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#include "xfs_export.h"
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#include "xfs_vnodeops.h"
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#include "xfs_bmap_btree.h"
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#include "xfs_inode.h"
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#include "xfs_vfsops.h"
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static struct dentry dotdot = { .d_name.name = "..", .d_name.len = 2, };
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/*
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* Note that we only accept fileids which are long enough rather than allow
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* the parent generation number to default to zero. XFS considers zero a
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* valid generation number not an invalid/wildcard value.
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*/
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static int xfs_fileid_length(int fileid_type)
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{
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switch (fileid_type) {
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case FILEID_INO32_GEN:
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return 2;
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case FILEID_INO32_GEN_PARENT:
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return 4;
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case FILEID_INO32_GEN | XFS_FILEID_TYPE_64FLAG:
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return 3;
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case FILEID_INO32_GEN_PARENT | XFS_FILEID_TYPE_64FLAG:
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return 6;
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}
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return 255; /* invalid */
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}
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STATIC int
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xfs_fs_encode_fh(
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struct dentry *dentry,
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__u32 *fh,
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int *max_len,
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int connectable)
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{
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struct fid *fid = (struct fid *)fh;
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struct xfs_fid64 *fid64 = (struct xfs_fid64 *)fh;
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struct inode *inode = dentry->d_inode;
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int fileid_type;
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int len;
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/* Directories don't need their parent encoded, they have ".." */
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if (S_ISDIR(inode->i_mode))
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fileid_type = FILEID_INO32_GEN;
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else
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fileid_type = FILEID_INO32_GEN_PARENT;
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/* filesystem may contain 64bit inode numbers */
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if (!(XFS_M(inode->i_sb)->m_flags & XFS_MOUNT_SMALL_INUMS))
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fileid_type |= XFS_FILEID_TYPE_64FLAG;
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/*
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* Only encode if there is enough space given. In practice
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* this means we can't export a filesystem with 64bit inodes
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* over NFSv2 with the subtree_check export option; the other
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* seven combinations work. The real answer is "don't use v2".
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*/
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len = xfs_fileid_length(fileid_type);
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if (*max_len < len)
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return 255;
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*max_len = len;
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switch (fileid_type) {
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case FILEID_INO32_GEN_PARENT:
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spin_lock(&dentry->d_lock);
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fid->i32.parent_ino = dentry->d_parent->d_inode->i_ino;
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fid->i32.parent_gen = dentry->d_parent->d_inode->i_generation;
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spin_unlock(&dentry->d_lock);
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/*FALLTHRU*/
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case FILEID_INO32_GEN:
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fid->i32.ino = inode->i_ino;
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fid->i32.gen = inode->i_generation;
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break;
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case FILEID_INO32_GEN_PARENT | XFS_FILEID_TYPE_64FLAG:
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spin_lock(&dentry->d_lock);
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fid64->parent_ino = dentry->d_parent->d_inode->i_ino;
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fid64->parent_gen = dentry->d_parent->d_inode->i_generation;
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spin_unlock(&dentry->d_lock);
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/*FALLTHRU*/
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case FILEID_INO32_GEN | XFS_FILEID_TYPE_64FLAG:
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fid64->ino = inode->i_ino;
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fid64->gen = inode->i_generation;
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break;
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}
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return fileid_type;
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}
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STATIC struct inode *
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xfs_nfs_get_inode(
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struct super_block *sb,
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u64 ino,
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u32 generation)
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{
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xfs_fid_t xfid;
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bhv_vnode_t *vp;
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int error;
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xfid.fid_len = sizeof(xfs_fid_t) - sizeof(xfid.fid_len);
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xfid.fid_pad = 0;
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xfid.fid_ino = ino;
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xfid.fid_gen = generation;
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error = xfs_vget(XFS_M(sb), &vp, &xfid);
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if (error)
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return ERR_PTR(-error);
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return vp ? vn_to_inode(vp) : NULL;
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}
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STATIC struct dentry *
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xfs_fs_fh_to_dentry(struct super_block *sb, struct fid *fid,
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int fh_len, int fileid_type)
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{
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struct xfs_fid64 *fid64 = (struct xfs_fid64 *)fid;
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struct inode *inode = NULL;
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struct dentry *result;
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if (fh_len < xfs_fileid_length(fileid_type))
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return NULL;
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switch (fileid_type) {
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case FILEID_INO32_GEN_PARENT:
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case FILEID_INO32_GEN:
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inode = xfs_nfs_get_inode(sb, fid->i32.ino, fid->i32.gen);
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break;
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case FILEID_INO32_GEN_PARENT | XFS_FILEID_TYPE_64FLAG:
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case FILEID_INO32_GEN | XFS_FILEID_TYPE_64FLAG:
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inode = xfs_nfs_get_inode(sb, fid64->ino, fid64->gen);
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break;
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}
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if (!inode)
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return NULL;
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if (IS_ERR(inode))
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return ERR_PTR(PTR_ERR(inode));
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result = d_alloc_anon(inode);
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if (!result) {
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iput(inode);
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return ERR_PTR(-ENOMEM);
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}
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return result;
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}
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STATIC struct dentry *
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xfs_fs_fh_to_parent(struct super_block *sb, struct fid *fid,
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int fh_len, int fileid_type)
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{
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struct xfs_fid64 *fid64 = (struct xfs_fid64 *)fid;
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struct inode *inode = NULL;
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struct dentry *result;
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switch (fileid_type) {
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case FILEID_INO32_GEN_PARENT:
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inode = xfs_nfs_get_inode(sb, fid->i32.parent_ino,
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fid->i32.parent_gen);
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break;
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case FILEID_INO32_GEN_PARENT | XFS_FILEID_TYPE_64FLAG:
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inode = xfs_nfs_get_inode(sb, fid64->parent_ino,
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fid64->parent_gen);
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break;
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}
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if (!inode)
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return NULL;
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if (IS_ERR(inode))
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return ERR_PTR(PTR_ERR(inode));
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result = d_alloc_anon(inode);
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if (!result) {
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iput(inode);
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return ERR_PTR(-ENOMEM);
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}
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return result;
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}
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STATIC struct dentry *
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xfs_fs_get_parent(
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struct dentry *child)
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{
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int error;
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bhv_vnode_t *cvp;
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struct dentry *parent;
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cvp = NULL;
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error = xfs_lookup(XFS_I(child->d_inode), &dotdot, &cvp);
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if (unlikely(error))
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return ERR_PTR(-error);
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parent = d_alloc_anon(vn_to_inode(cvp));
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if (unlikely(!parent)) {
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VN_RELE(cvp);
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return ERR_PTR(-ENOMEM);
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}
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return parent;
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}
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const struct export_operations xfs_export_operations = {
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.encode_fh = xfs_fs_encode_fh,
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.fh_to_dentry = xfs_fs_fh_to_dentry,
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.fh_to_parent = xfs_fs_fh_to_parent,
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.get_parent = xfs_fs_get_parent,
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};
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