diff options
Diffstat (limited to 'fs/xfs/linux-2.6/xfs_export.c')
| -rw-r--r-- | fs/xfs/linux-2.6/xfs_export.c | 188 |
1 files changed, 0 insertions, 188 deletions
diff --git a/fs/xfs/linux-2.6/xfs_export.c b/fs/xfs/linux-2.6/xfs_export.c deleted file mode 100644 index 80eb249f2fa..00000000000 --- a/fs/xfs/linux-2.6/xfs_export.c +++ /dev/null @@ -1,188 +0,0 @@ -/* - * 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_types.h" -#include "xfs_dmapi.h" -#include "xfs_log.h" -#include "xfs_trans.h" -#include "xfs_sb.h" -#include "xfs_dir.h" -#include "xfs_mount.h" -#include "xfs_export.h" - -/* - * XFS encodes and decodes the fileid portion of NFS filehandles - * itself instead of letting the generic NFS code do it. This - * allows filesystems with 64 bit inode numbers to be exported. - * - * Note that a side effect is that xfs_vget() won't be passed a - * zero inode/generation pair under normal circumstances. As - * however a malicious client could send us such data, the check - * remains in that code. - */ - -STATIC struct dentry * -linvfs_decode_fh( - struct super_block *sb, - __u32 *fh, - int fh_len, - int fileid_type, - int (*acceptable)( - void *context, - struct dentry *de), - void *context) -{ - xfs_fid2_t ifid; - xfs_fid2_t pfid; - void *parent = NULL; - int is64 = 0; - __u32 *p = fh; - -#if XFS_BIG_INUMS - is64 = (fileid_type & XFS_FILEID_TYPE_64FLAG); - fileid_type &= ~XFS_FILEID_TYPE_64FLAG; -#endif - - /* - * 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. There's little point printk'ing - * a warning here as we don't have the client information - * which would make such a warning useful. - */ - if (fileid_type > 2 || - fh_len < xfs_fileid_length((fileid_type == 2), is64)) - return NULL; - - p = xfs_fileid_decode_fid2(p, &ifid, is64); - - if (fileid_type == 2) { - p = xfs_fileid_decode_fid2(p, &pfid, is64); - parent = &pfid; - } - - fh = (__u32 *)&ifid; - return find_exported_dentry(sb, fh, parent, acceptable, context); -} - - -STATIC int -linvfs_encode_fh( - struct dentry *dentry, - __u32 *fh, - int *max_len, - int connectable) -{ - struct inode *inode = dentry->d_inode; - int type = 1; - __u32 *p = fh; - int len; - int is64 = 0; -#if XFS_BIG_INUMS - vfs_t *vfs = LINVFS_GET_VFS(inode->i_sb); - - if (!(vfs->vfs_flag & VFS_32BITINODES)) { - /* filesystem may contain 64bit inode numbers */ - is64 = XFS_FILEID_TYPE_64FLAG; - } -#endif - - /* Directories don't need their parent encoded, they have ".." */ - if (S_ISDIR(inode->i_mode)) - connectable = 0; - - /* - * 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(connectable, is64); - if (*max_len < len) - return 255; - *max_len = len; - - p = xfs_fileid_encode_inode(p, inode, is64); - if (connectable) { - spin_lock(&dentry->d_lock); - p = xfs_fileid_encode_inode(p, dentry->d_parent->d_inode, is64); - spin_unlock(&dentry->d_lock); - type = 2; - } - BUG_ON((p - fh) != len); - return type | is64; -} - -STATIC struct dentry * -linvfs_get_dentry( - struct super_block *sb, - void *data) -{ - vnode_t *vp; - struct inode *inode; - struct dentry *result; - vfs_t *vfsp = LINVFS_GET_VFS(sb); - int error; - - VFS_VGET(vfsp, &vp, (fid_t *)data, error); - if (error || vp == NULL) - return ERR_PTR(-ESTALE) ; - - inode = LINVFS_GET_IP(vp); - result = d_alloc_anon(inode); - if (!result) { - iput(inode); - return ERR_PTR(-ENOMEM); - } - return result; -} - -STATIC struct dentry * -linvfs_get_parent( - struct dentry *child) -{ - int error; - vnode_t *vp, *cvp; - struct dentry *parent; - struct dentry dotdot; - - dotdot.d_name.name = ".."; - dotdot.d_name.len = 2; - dotdot.d_inode = NULL; - - cvp = NULL; - vp = LINVFS_GET_VP(child->d_inode); - VOP_LOOKUP(vp, &dotdot, &cvp, 0, NULL, NULL, error); - if (unlikely(error)) - return ERR_PTR(-error); - - parent = d_alloc_anon(LINVFS_GET_IP(cvp)); - if (unlikely(!parent)) { - VN_RELE(cvp); - return ERR_PTR(-ENOMEM); - } - return parent; -} - -struct export_operations linvfs_export_ops = { - .decode_fh = linvfs_decode_fh, - .encode_fh = linvfs_encode_fh, - .get_parent = linvfs_get_parent, - .get_dentry = linvfs_get_dentry, -}; |