FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/module/os/linux/zfs/zpl_export.c

     /*
      * CDDL HEADER START
      *
      * The contents of this file are subject to the terms of the
      * Common Development and Distribution License (the "License").
      * You may not use this file except in compliance with the License.
      *
      * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
      * or https://opensource.org/licenses/CDDL-1.0.
     * See the License for the specific language governing permissions
     * and limitations under the License.
     *
     * When distributing Covered Code, include this CDDL HEADER in each
     * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
     * If applicable, add the following below this CDDL HEADER, with the
     * fields enclosed by brackets "[]" replaced with your own identifying
     * information: Portions Copyright [yyyy] [name of copyright owner]
     *
     * CDDL HEADER END
     */
    /*
     * Copyright (c) 2011 Gunnar Beutner
     * Copyright (c) 2012 Cyril Plisko. All rights reserved.
     */
    
    
    #include <sys/zfs_znode.h>
    #include <sys/zfs_vnops.h>
    #include <sys/zfs_ctldir.h>
    #include <sys/zpl.h>
    
    
    static int
    #ifdef HAVE_ENCODE_FH_WITH_INODE
    zpl_encode_fh(struct inode *ip, __u32 *fh, int *max_len, struct inode *parent)
    {
    #else
    zpl_encode_fh(struct dentry *dentry, __u32 *fh, int *max_len, int connectable)
    {
            /* CSTYLED */
            struct inode *ip = dentry->d_inode;
    #endif /* HAVE_ENCODE_FH_WITH_INODE */
            fstrans_cookie_t cookie;
            ushort_t empty_fid = 0;
            fid_t *fid;
            int len_bytes, rc;
    
            len_bytes = *max_len * sizeof (__u32);
    
            if (len_bytes < offsetof(fid_t, fid_data)) {
                    fid = (fid_t *)&empty_fid;
            } else {
                    fid = (fid_t *)fh;
                    fid->fid_len = len_bytes - offsetof(fid_t, fid_data);
            }
    
            cookie = spl_fstrans_mark();
    
            if (zfsctl_is_node(ip))
                    rc = zfsctl_fid(ip, fid);
            else
                    rc = zfs_fid(ip, fid);
    
            spl_fstrans_unmark(cookie);
            len_bytes = offsetof(fid_t, fid_data) + fid->fid_len;
            *max_len = roundup(len_bytes, sizeof (__u32)) / sizeof (__u32);
    
            return (rc == 0 ? FILEID_INO32_GEN : 255);
    }
    
    static struct dentry *
    zpl_fh_to_dentry(struct super_block *sb, struct fid *fh,
        int fh_len, int fh_type)
    {
            fid_t *fid = (fid_t *)fh;
            fstrans_cookie_t cookie;
            struct inode *ip;
            int len_bytes, rc;
    
            len_bytes = fh_len * sizeof (__u32);
    
            if (fh_type != FILEID_INO32_GEN ||
                len_bytes < offsetof(fid_t, fid_data) ||
                len_bytes < offsetof(fid_t, fid_data) + fid->fid_len)
                    return (ERR_PTR(-EINVAL));
    
            cookie = spl_fstrans_mark();
            rc = zfs_vget(sb, &ip, fid);
            spl_fstrans_unmark(cookie);
    
            if (rc) {
                    /*
                     * If we see ENOENT it might mean that an NFSv4 * client
                     * is using a cached inode value in a file handle and
                     * that the sought after file has had its inode changed
                     * by a third party.  So change the error to ESTALE
                     * which will trigger a full lookup by the client and
                     * will find the new filename/inode pair if it still
                     * exists.
                    */
                   if (rc == ENOENT)
                           rc = ESTALE;
   
                   return (ERR_PTR(-rc));
           }
   
           ASSERT((ip != NULL) && !IS_ERR(ip));
   
           return (d_obtain_alias(ip));
   }
   
   static struct dentry *
   zpl_get_parent(struct dentry *child)
   {
           cred_t *cr = CRED();
           fstrans_cookie_t cookie;
           znode_t *zp;
           int error;
   
           crhold(cr);
           cookie = spl_fstrans_mark();
           error = -zfs_lookup(ITOZ(child->d_inode), "..", &zp, 0, cr, NULL, NULL);
           spl_fstrans_unmark(cookie);
           crfree(cr);
           ASSERT3S(error, <=, 0);
   
           if (error)
                   return (ERR_PTR(error));
   
           return (d_obtain_alias(ZTOI(zp)));
   }
   
   static int
   zpl_commit_metadata(struct inode *inode)
   {
           cred_t *cr = CRED();
           fstrans_cookie_t cookie;
           int error;
   
           if (zfsctl_is_node(inode))
                   return (0);
   
           crhold(cr);
           cookie = spl_fstrans_mark();
           error = -zfs_fsync(ITOZ(inode), 0, cr);
           spl_fstrans_unmark(cookie);
           crfree(cr);
           ASSERT3S(error, <=, 0);
   
           return (error);
   }
   
   const struct export_operations zpl_export_operations = {
           .encode_fh              = zpl_encode_fh,
           .fh_to_dentry           = zpl_fh_to_dentry,
           .get_parent             = zpl_get_parent,
           .commit_metadata        = zpl_commit_metadata,
   };

Cache object: 75fdf6d99b13726d4230bbe9c1250779