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237 lines
5.8 KiB
237 lines
5.8 KiB
// 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_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 xfs_mount *mp = XFS_M(inode->i_sb); |
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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 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_has_small_inums(mp) || xfs_is_inode32(mp)) |
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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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fallthrough; |
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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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fallthrough; |
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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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return xfs_log_force_inode(XFS_I(inode)); |
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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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