250 lines
6.2 KiB
C
250 lines
6.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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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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#include "xfs.h"
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#include "xfs_shared.h"
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#include "xfs_format.h"
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#include "xfs_log_format.h"
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#include "xfs_trans_resv.h"
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#include "xfs_mount.h"
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#include "xfs_dir2.h"
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#include "xfs_export.h"
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#include "xfs_inode.h"
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#include "xfs_trans.h"
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#include "xfs_inode_item.h"
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#include "xfs_icache.h"
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#include "xfs_log.h"
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#include "xfs_pnfs.h"
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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 FILEID_INVALID;
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}
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STATIC int
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xfs_fs_encode_fh(
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struct inode *inode,
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__u32 *fh,
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int *max_len,
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struct inode *parent)
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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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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 (!parent)
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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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/*
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* If the the filesystem may contain 64bit inode numbers, we need
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* to use larger file handles that can represent them.
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*
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* While we only allocate inodes that do not fit into 32 bits any
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* large enough filesystem may contain them, thus the slightly
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* confusing looking conditional below.
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*/
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if (!(XFS_M(inode->i_sb)->m_flags & XFS_MOUNT_SMALL_INUMS) ||
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(XFS_M(inode->i_sb)->m_flags & XFS_MOUNT_32BITINODES))
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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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*max_len = len;
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return FILEID_INVALID;
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}
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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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fid->i32.parent_ino = XFS_I(parent)->i_ino;
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fid->i32.parent_gen = parent->i_generation;
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/*FALLTHRU*/
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case FILEID_INO32_GEN:
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fid->i32.ino = XFS_I(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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fid64->parent_ino = XFS_I(parent)->i_ino;
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fid64->parent_gen = parent->i_generation;
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/*FALLTHRU*/
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case FILEID_INO32_GEN | XFS_FILEID_TYPE_64FLAG:
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fid64->ino = XFS_I(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_mount_t *mp = XFS_M(sb);
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xfs_inode_t *ip;
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int error;
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/*
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* NFS can sometimes send requests for ino 0. Fail them gracefully.
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*/
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if (ino == 0)
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return ERR_PTR(-ESTALE);
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/*
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* The XFS_IGET_UNTRUSTED means that an invalid inode number is just
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* fine and not an indication of a corrupted filesystem as clients can
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* send invalid file handles and we have to handle it gracefully..
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*/
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error = xfs_iget(mp, NULL, ino, XFS_IGET_UNTRUSTED, 0, &ip);
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if (error) {
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/*
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* EINVAL means the inode cluster doesn't exist anymore.
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* EFSCORRUPTED means the metadata pointing to the inode cluster
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* or the inode cluster itself is corrupt. This implies the
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* filehandle is stale, so we should translate it here.
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* We don't use ESTALE directly down the chain to not
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* confuse applications using bulkstat that expect EINVAL.
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*/
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switch (error) {
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case -EINVAL:
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case -ENOENT:
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case -EFSCORRUPTED:
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error = -ESTALE;
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break;
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default:
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break;
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}
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return ERR_PTR(error);
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}
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if (VFS_I(ip)->i_generation != generation) {
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xfs_irele(ip);
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return ERR_PTR(-ESTALE);
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}
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return VFS_I(ip);
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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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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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return d_obtain_alias(inode);
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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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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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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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return d_obtain_alias(inode);
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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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struct xfs_inode *cip;
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error = xfs_lookup(XFS_I(d_inode(child)), &xfs_name_dotdot, &cip, NULL);
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if (unlikely(error))
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return ERR_PTR(error);
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return d_obtain_alias(VFS_I(cip));
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}
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STATIC int
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xfs_fs_nfs_commit_metadata(
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struct inode *inode)
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{
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struct xfs_inode *ip = XFS_I(inode);
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struct xfs_mount *mp = ip->i_mount;
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xfs_lsn_t lsn = 0;
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xfs_ilock(ip, XFS_ILOCK_SHARED);
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if (xfs_ipincount(ip))
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lsn = ip->i_itemp->ili_last_lsn;
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xfs_iunlock(ip, XFS_ILOCK_SHARED);
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if (!lsn)
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return 0;
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return xfs_log_force_lsn(mp, lsn, XFS_LOG_SYNC, NULL);
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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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.commit_metadata = xfs_fs_nfs_commit_metadata,
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#ifdef CONFIG_EXPORTFS_BLOCK_OPS
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.get_uuid = xfs_fs_get_uuid,
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.map_blocks = xfs_fs_map_blocks,
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.commit_blocks = xfs_fs_commit_blocks,
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#endif
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};
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