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c98e9daa59
Several existing dprink()/dfprintk() calls were converted to use the new mount API logging macros by commitce8866f091
("NFS: Attach supplementary error information to fs_context"). If the fs_context was not created using fsopen() then it will not have had a log buffer allocated for it, and the new mount API logging macros will wind up calling printk(). This can result in syslog messages being logged where previously there were none... most notably "NFS4: Couldn't follow remote path", which can happen if the client is auto-negotiating a protocol version with an NFS server that doesn't support the higher v4.x versions. Convert the nfs_errorf(), nfs_invalf(), and nfs_warnf() macros to check for the existence of the fs_context's log buffer and call dprintk() if it doesn't exist. Add nfs_ferrorf(), nfs_finvalf(), and nfs_warnf(), which do the same thing but take an NFS debug flag as an argument and call dfprintk(). Finally, modify the "NFS4: Couldn't follow remote path" message to use nfs_ferrorf(). Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=207385 Signed-off-by: Scott Mayhew <smayhew@redhat.com> Reviewed-by: Benjamin Coddington <bcodding@redhat.com> Fixes:ce8866f091
("NFS: Attach supplementary error information to fs_context.") Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
315 lines
6.9 KiB
C
315 lines
6.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2012 Bryan Schumaker <bjschuma@netapp.com>
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/mount.h>
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#include <linux/nfs4_mount.h>
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#include <linux/nfs_fs.h>
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#include <linux/nfs_ssc.h>
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#include "delegation.h"
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#include "internal.h"
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#include "nfs4_fs.h"
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#include "nfs4idmap.h"
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#include "dns_resolve.h"
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#include "pnfs.h"
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#include "nfs.h"
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#define NFSDBG_FACILITY NFSDBG_VFS
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static int nfs4_write_inode(struct inode *inode, struct writeback_control *wbc);
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static void nfs4_evict_inode(struct inode *inode);
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static const struct super_operations nfs4_sops = {
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.alloc_inode = nfs_alloc_inode,
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.free_inode = nfs_free_inode,
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.write_inode = nfs4_write_inode,
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.drop_inode = nfs_drop_inode,
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.statfs = nfs_statfs,
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.evict_inode = nfs4_evict_inode,
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.umount_begin = nfs_umount_begin,
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.show_options = nfs_show_options,
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.show_devname = nfs_show_devname,
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.show_path = nfs_show_path,
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.show_stats = nfs_show_stats,
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};
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struct nfs_subversion nfs_v4 = {
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.owner = THIS_MODULE,
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.nfs_fs = &nfs4_fs_type,
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.rpc_vers = &nfs_version4,
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.rpc_ops = &nfs_v4_clientops,
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.sops = &nfs4_sops,
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.xattr = nfs4_xattr_handlers,
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};
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static int nfs4_write_inode(struct inode *inode, struct writeback_control *wbc)
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{
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int ret = nfs_write_inode(inode, wbc);
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if (ret == 0)
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ret = pnfs_layoutcommit_inode(inode,
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wbc->sync_mode == WB_SYNC_ALL);
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return ret;
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}
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/*
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* Clean out any remaining NFSv4 state that might be left over due
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* to open() calls that passed nfs_atomic_lookup, but failed to call
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* nfs_open().
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*/
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static void nfs4_evict_inode(struct inode *inode)
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{
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truncate_inode_pages_final(&inode->i_data);
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clear_inode(inode);
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/* If we are holding a delegation, return and free it */
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nfs_inode_evict_delegation(inode);
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/* Note that above delegreturn would trigger pnfs return-on-close */
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pnfs_return_layout(inode);
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pnfs_destroy_layout_final(NFS_I(inode));
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/* First call standard NFS clear_inode() code */
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nfs_clear_inode(inode);
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nfs4_xattr_cache_zap(inode);
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}
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struct nfs_referral_count {
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struct list_head list;
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const struct task_struct *task;
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unsigned int referral_count;
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};
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static LIST_HEAD(nfs_referral_count_list);
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static DEFINE_SPINLOCK(nfs_referral_count_list_lock);
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static struct nfs_referral_count *nfs_find_referral_count(void)
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{
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struct nfs_referral_count *p;
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list_for_each_entry(p, &nfs_referral_count_list, list) {
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if (p->task == current)
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return p;
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}
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return NULL;
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}
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#define NFS_MAX_NESTED_REFERRALS 2
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static int nfs_referral_loop_protect(void)
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{
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struct nfs_referral_count *p, *new;
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int ret = -ENOMEM;
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new = kmalloc(sizeof(*new), GFP_KERNEL);
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if (!new)
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goto out;
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new->task = current;
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new->referral_count = 1;
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ret = 0;
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spin_lock(&nfs_referral_count_list_lock);
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p = nfs_find_referral_count();
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if (p != NULL) {
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if (p->referral_count >= NFS_MAX_NESTED_REFERRALS)
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ret = -ELOOP;
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else
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p->referral_count++;
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} else {
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list_add(&new->list, &nfs_referral_count_list);
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new = NULL;
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}
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spin_unlock(&nfs_referral_count_list_lock);
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kfree(new);
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out:
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return ret;
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}
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static void nfs_referral_loop_unprotect(void)
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{
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struct nfs_referral_count *p;
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spin_lock(&nfs_referral_count_list_lock);
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p = nfs_find_referral_count();
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p->referral_count--;
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if (p->referral_count == 0)
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list_del(&p->list);
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else
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p = NULL;
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spin_unlock(&nfs_referral_count_list_lock);
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kfree(p);
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}
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static int do_nfs4_mount(struct nfs_server *server,
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struct fs_context *fc,
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const char *hostname,
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const char *export_path)
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{
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struct nfs_fs_context *root_ctx;
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struct fs_context *root_fc;
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struct vfsmount *root_mnt;
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struct dentry *dentry;
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size_t len;
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int ret;
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struct fs_parameter param = {
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.key = "source",
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.type = fs_value_is_string,
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.dirfd = -1,
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};
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if (IS_ERR(server))
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return PTR_ERR(server);
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root_fc = vfs_dup_fs_context(fc);
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if (IS_ERR(root_fc)) {
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nfs_free_server(server);
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return PTR_ERR(root_fc);
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}
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kfree(root_fc->source);
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root_fc->source = NULL;
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root_ctx = nfs_fc2context(root_fc);
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root_ctx->internal = true;
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root_ctx->server = server;
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/* We leave export_path unset as it's not used to find the root. */
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len = strlen(hostname) + 5;
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param.string = kmalloc(len, GFP_KERNEL);
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if (param.string == NULL) {
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put_fs_context(root_fc);
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return -ENOMEM;
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}
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/* Does hostname needs to be enclosed in brackets? */
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if (strchr(hostname, ':'))
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param.size = snprintf(param.string, len, "[%s]:/", hostname);
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else
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param.size = snprintf(param.string, len, "%s:/", hostname);
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ret = vfs_parse_fs_param(root_fc, ¶m);
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kfree(param.string);
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if (ret < 0) {
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put_fs_context(root_fc);
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return ret;
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}
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root_mnt = fc_mount(root_fc);
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put_fs_context(root_fc);
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if (IS_ERR(root_mnt))
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return PTR_ERR(root_mnt);
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ret = nfs_referral_loop_protect();
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if (ret) {
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mntput(root_mnt);
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return ret;
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}
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dentry = mount_subtree(root_mnt, export_path);
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nfs_referral_loop_unprotect();
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if (IS_ERR(dentry))
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return PTR_ERR(dentry);
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fc->root = dentry;
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return 0;
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}
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int nfs4_try_get_tree(struct fs_context *fc)
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{
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struct nfs_fs_context *ctx = nfs_fc2context(fc);
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int err;
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dfprintk(MOUNT, "--> nfs4_try_get_tree()\n");
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/* We create a mount for the server's root, walk to the requested
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* location and then create another mount for that.
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*/
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err= do_nfs4_mount(nfs4_create_server(fc),
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fc, ctx->nfs_server.hostname,
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ctx->nfs_server.export_path);
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if (err) {
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nfs_ferrorf(fc, MOUNT, "NFS4: Couldn't follow remote path");
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dfprintk(MOUNT, "<-- nfs4_try_get_tree() = %d [error]\n", err);
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} else {
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dfprintk(MOUNT, "<-- nfs4_try_get_tree() = 0\n");
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}
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return err;
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}
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/*
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* Create an NFS4 server record on referral traversal
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*/
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int nfs4_get_referral_tree(struct fs_context *fc)
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{
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struct nfs_fs_context *ctx = nfs_fc2context(fc);
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int err;
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dprintk("--> nfs4_referral_mount()\n");
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/* create a new volume representation */
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err = do_nfs4_mount(nfs4_create_referral_server(fc),
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fc, ctx->nfs_server.hostname,
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ctx->nfs_server.export_path);
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if (err) {
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nfs_ferrorf(fc, MOUNT, "NFS4: Couldn't follow remote path");
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dfprintk(MOUNT, "<-- nfs4_get_referral_tree() = %d [error]\n", err);
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} else {
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dfprintk(MOUNT, "<-- nfs4_get_referral_tree() = 0\n");
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}
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return err;
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}
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static int __init init_nfs_v4(void)
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{
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int err;
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err = nfs_dns_resolver_init();
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if (err)
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goto out;
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err = nfs_idmap_init();
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if (err)
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goto out1;
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#ifdef CONFIG_NFS_V4_2
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err = nfs4_xattr_cache_init();
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if (err)
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goto out2;
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#endif
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err = nfs4_register_sysctl();
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if (err)
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goto out2;
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#ifdef CONFIG_NFS_V4_2
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nfs42_ssc_register_ops();
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#endif
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register_nfs_version(&nfs_v4);
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return 0;
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out2:
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nfs_idmap_quit();
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out1:
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nfs_dns_resolver_destroy();
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out:
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return err;
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}
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static void __exit exit_nfs_v4(void)
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{
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/* Not called in the _init(), conditionally loaded */
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nfs4_pnfs_v3_ds_connect_unload();
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unregister_nfs_version(&nfs_v4);
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#ifdef CONFIG_NFS_V4_2
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nfs4_xattr_cache_exit();
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nfs42_ssc_unregister_ops();
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#endif
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nfs4_unregister_sysctl();
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nfs_idmap_quit();
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nfs_dns_resolver_destroy();
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}
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MODULE_LICENSE("GPL");
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module_init(init_nfs_v4);
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module_exit(exit_nfs_v4);
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