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c074a7de13
Quoting <linux/exportfs.h>: > encode_fh() should return the fileid_type on success and on error > returns 255 (if the space needed to encode fh is greater than > @max_len*4 bytes). On error @max_len contains the minimum size (in 4 > byte unit) needed to encode the file handle. ZFS was not setting max_len in the case where the handle was too small. As a result of this, the `t_name_to_handle_at.c' example in name_to_handle_at(2) did not work on ZFS. zfsctl_fid() will itself set max_len if called with a fid that is too small, so if we give zfs_fid() that behavior as well, the fix is quite easy: if the handle is too small, just use a zero-size fid instead of the handle. Tested by running t_name_to_handle_at on a normal file, a directory, a .zfs directory, and a snapshot. Thanks-to: Puck Meerburg <puck@puckipedia.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Tony Nguyen <tony.nguyen@delphix.com> Signed-off-by: Alyssa Ross <hi@alyssa.is> Closes #11995
159 lines
3.8 KiB
C
159 lines
3.8 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright (c) 2011 Gunnar Beutner
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* Copyright (c) 2012 Cyril Plisko. All rights reserved.
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*/
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#include <sys/zfs_znode.h>
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#include <sys/zfs_vnops.h>
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#include <sys/zfs_ctldir.h>
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#include <sys/zpl.h>
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static int
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#ifdef HAVE_ENCODE_FH_WITH_INODE
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zpl_encode_fh(struct inode *ip, __u32 *fh, int *max_len, struct inode *parent)
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{
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#else
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zpl_encode_fh(struct dentry *dentry, __u32 *fh, int *max_len, int connectable)
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{
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/* CSTYLED */
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struct inode *ip = dentry->d_inode;
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#endif /* HAVE_ENCODE_FH_WITH_INODE */
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fstrans_cookie_t cookie;
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ushort_t empty_fid = 0;
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fid_t *fid;
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int len_bytes, rc;
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len_bytes = *max_len * sizeof (__u32);
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if (len_bytes < offsetof(fid_t, fid_data)) {
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fid = (fid_t *)&empty_fid;
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} else {
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fid = (fid_t *)fh;
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fid->fid_len = len_bytes - offsetof(fid_t, fid_data);
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}
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cookie = spl_fstrans_mark();
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if (zfsctl_is_node(ip))
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rc = zfsctl_fid(ip, fid);
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else
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rc = zfs_fid(ip, fid);
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spl_fstrans_unmark(cookie);
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len_bytes = offsetof(fid_t, fid_data) + fid->fid_len;
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*max_len = roundup(len_bytes, sizeof (__u32)) / sizeof (__u32);
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return (rc == 0 ? FILEID_INO32_GEN : 255);
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}
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static struct dentry *
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zpl_fh_to_dentry(struct super_block *sb, struct fid *fh,
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int fh_len, int fh_type)
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{
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fid_t *fid = (fid_t *)fh;
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fstrans_cookie_t cookie;
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struct inode *ip;
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int len_bytes, rc;
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len_bytes = fh_len * sizeof (__u32);
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if (fh_type != FILEID_INO32_GEN ||
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len_bytes < offsetof(fid_t, fid_data) ||
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len_bytes < offsetof(fid_t, fid_data) + fid->fid_len)
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return (ERR_PTR(-EINVAL));
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cookie = spl_fstrans_mark();
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rc = zfs_vget(sb, &ip, fid);
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spl_fstrans_unmark(cookie);
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if (rc) {
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/*
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* If we see ENOENT it might mean that an NFSv4 * client
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* is using a cached inode value in a file handle and
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* that the sought after file has had its inode changed
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* by a third party. So change the error to ESTALE
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* which will trigger a full lookup by the client and
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* will find the new filename/inode pair if it still
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* exists.
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*/
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if (rc == ENOENT)
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rc = ESTALE;
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return (ERR_PTR(-rc));
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}
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ASSERT((ip != NULL) && !IS_ERR(ip));
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return (d_obtain_alias(ip));
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}
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static struct dentry *
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zpl_get_parent(struct dentry *child)
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{
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cred_t *cr = CRED();
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fstrans_cookie_t cookie;
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znode_t *zp;
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int error;
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crhold(cr);
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cookie = spl_fstrans_mark();
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error = -zfs_lookup(ITOZ(child->d_inode), "..", &zp, 0, cr, NULL, NULL);
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spl_fstrans_unmark(cookie);
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crfree(cr);
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ASSERT3S(error, <=, 0);
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if (error)
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return (ERR_PTR(error));
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return (d_obtain_alias(ZTOI(zp)));
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}
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static int
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zpl_commit_metadata(struct inode *inode)
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{
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cred_t *cr = CRED();
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fstrans_cookie_t cookie;
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int error;
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if (zfsctl_is_node(inode))
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return (0);
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crhold(cr);
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cookie = spl_fstrans_mark();
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error = -zfs_fsync(ITOZ(inode), 0, cr);
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spl_fstrans_unmark(cookie);
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crfree(cr);
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ASSERT3S(error, <=, 0);
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return (error);
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}
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const struct export_operations zpl_export_operations = {
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.encode_fh = zpl_encode_fh,
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.fh_to_dentry = zpl_fh_to_dentry,
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.get_parent = zpl_get_parent,
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.commit_metadata = zpl_commit_metadata,
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};
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