From 9999e48639b3cecb08ffb37358bcba3b48161b29 Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Fri, 10 May 2024 08:50:17 +0000
Subject: [PATCH] add ax88772_rst
---
kernel/fs/afs/mntpt.c | 195 +++++++++++++++++++++++++-----------------------
1 files changed, 100 insertions(+), 95 deletions(-)
diff --git a/kernel/fs/afs/mntpt.c b/kernel/fs/afs/mntpt.c
index 99fd135..bbb2c21 100644
--- a/kernel/fs/afs/mntpt.c
+++ b/kernel/fs/afs/mntpt.c
@@ -1,12 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
/* mountpoint management
*
* Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
*/
#include <linux/kernel.h>
@@ -17,6 +13,7 @@
#include <linux/mount.h>
#include <linux/namei.h>
#include <linux/gfp.h>
+#include <linux/fs_context.h>
#include "internal.h"
@@ -35,7 +32,6 @@
.lookup = afs_mntpt_lookup,
.readlink = page_readlink,
.getattr = afs_getattr,
- .listxattr = afs_listxattr,
};
const struct inode_operations afs_autocell_inode_operations = {
@@ -46,6 +42,8 @@
static DECLARE_DELAYED_WORK(afs_mntpt_expiry_timer, afs_mntpt_expiry_timed_out);
static unsigned long afs_mntpt_expiry_timeout = 10 * 60;
+
+static const char afs_root_volume[] = "root.cell";
/*
* no valid lookup procedure on this sort of dir
@@ -68,107 +66,114 @@
}
/*
+ * Set the parameters for the proposed superblock.
+ */
+static int afs_mntpt_set_params(struct fs_context *fc, struct dentry *mntpt)
+{
+ struct afs_fs_context *ctx = fc->fs_private;
+ struct afs_super_info *src_as = AFS_FS_S(mntpt->d_sb);
+ struct afs_vnode *vnode = AFS_FS_I(d_inode(mntpt));
+ struct afs_cell *cell;
+ const char *p;
+ int ret;
+
+ if (fc->net_ns != src_as->net_ns) {
+ put_net(fc->net_ns);
+ fc->net_ns = get_net(src_as->net_ns);
+ }
+
+ if (src_as->volume && src_as->volume->type == AFSVL_RWVOL) {
+ ctx->type = AFSVL_RWVOL;
+ ctx->force = true;
+ }
+ if (ctx->cell) {
+ afs_unuse_cell(ctx->net, ctx->cell, afs_cell_trace_unuse_mntpt);
+ ctx->cell = NULL;
+ }
+ if (test_bit(AFS_VNODE_PSEUDODIR, &vnode->flags)) {
+ /* if the directory is a pseudo directory, use the d_name */
+ unsigned size = mntpt->d_name.len;
+
+ if (size < 2)
+ return -ENOENT;
+
+ p = mntpt->d_name.name;
+ if (mntpt->d_name.name[0] == '.') {
+ size--;
+ p++;
+ ctx->type = AFSVL_RWVOL;
+ ctx->force = true;
+ }
+ if (size > AFS_MAXCELLNAME)
+ return -ENAMETOOLONG;
+
+ cell = afs_lookup_cell(ctx->net, p, size, NULL, false);
+ if (IS_ERR(cell)) {
+ pr_err("kAFS: unable to lookup cell '%pd'\n", mntpt);
+ return PTR_ERR(cell);
+ }
+ ctx->cell = cell;
+
+ ctx->volname = afs_root_volume;
+ ctx->volnamesz = sizeof(afs_root_volume) - 1;
+ } else {
+ /* read the contents of the AFS special symlink */
+ struct page *page;
+ loff_t size = i_size_read(d_inode(mntpt));
+ char *buf;
+
+ if (src_as->cell)
+ ctx->cell = afs_use_cell(src_as->cell, afs_cell_trace_use_mntpt);
+
+ if (size < 2 || size > PAGE_SIZE - 1)
+ return -EINVAL;
+
+ page = read_mapping_page(d_inode(mntpt)->i_mapping, 0, NULL);
+ if (IS_ERR(page))
+ return PTR_ERR(page);
+
+ if (PageError(page)) {
+ ret = afs_bad(AFS_FS_I(d_inode(mntpt)), afs_file_error_mntpt);
+ put_page(page);
+ return ret;
+ }
+
+ buf = kmap(page);
+ ret = -EINVAL;
+ if (buf[size - 1] == '.')
+ ret = vfs_parse_fs_string(fc, "source", buf, size - 1);
+ kunmap(page);
+ put_page(page);
+ if (ret < 0)
+ return ret;
+ }
+
+ return 0;
+}
+
+/*
* create a vfsmount to be automounted
*/
static struct vfsmount *afs_mntpt_do_automount(struct dentry *mntpt)
{
- struct afs_super_info *as;
+ struct fs_context *fc;
struct vfsmount *mnt;
- struct afs_vnode *vnode;
- struct page *page;
- char *devname, *options;
- bool rwpath = false;
int ret;
-
- _enter("{%pd}", mntpt);
BUG_ON(!d_inode(mntpt));
- ret = -ENOMEM;
- devname = (char *) get_zeroed_page(GFP_KERNEL);
- if (!devname)
- goto error_no_devname;
+ fc = fs_context_for_submount(&afs_fs_type, mntpt);
+ if (IS_ERR(fc))
+ return ERR_CAST(fc);
- options = (char *) get_zeroed_page(GFP_KERNEL);
- if (!options)
- goto error_no_options;
+ ret = afs_mntpt_set_params(fc, mntpt);
+ if (!ret)
+ mnt = fc_mount(fc);
+ else
+ mnt = ERR_PTR(ret);
- vnode = AFS_FS_I(d_inode(mntpt));
- if (test_bit(AFS_VNODE_PSEUDODIR, &vnode->flags)) {
- /* if the directory is a pseudo directory, use the d_name */
- static const char afs_root_cell[] = ":root.cell.";
- unsigned size = mntpt->d_name.len;
-
- ret = -ENOENT;
- if (size < 2 || size > AFS_MAXCELLNAME)
- goto error_no_page;
-
- if (mntpt->d_name.name[0] == '.') {
- devname[0] = '%';
- memcpy(devname + 1, mntpt->d_name.name + 1, size - 1);
- memcpy(devname + size, afs_root_cell,
- sizeof(afs_root_cell));
- rwpath = true;
- } else {
- devname[0] = '#';
- memcpy(devname + 1, mntpt->d_name.name, size);
- memcpy(devname + size + 1, afs_root_cell,
- sizeof(afs_root_cell));
- }
- } else {
- /* read the contents of the AFS special symlink */
- loff_t size = i_size_read(d_inode(mntpt));
- char *buf;
-
- ret = -EINVAL;
- if (size > PAGE_SIZE - 1)
- goto error_no_page;
-
- page = read_mapping_page(d_inode(mntpt)->i_mapping, 0, NULL);
- if (IS_ERR(page)) {
- ret = PTR_ERR(page);
- goto error_no_page;
- }
-
- ret = -EIO;
- if (PageError(page))
- goto error;
-
- buf = kmap_atomic(page);
- memcpy(devname, buf, size);
- kunmap_atomic(buf);
- put_page(page);
- page = NULL;
- }
-
- /* work out what options we want */
- as = AFS_FS_S(mntpt->d_sb);
- if (as->cell) {
- memcpy(options, "cell=", 5);
- strcpy(options + 5, as->cell->name);
- if ((as->volume && as->volume->type == AFSVL_RWVOL) || rwpath)
- strcat(options, ",rwpath");
- }
-
- /* try and do the mount */
- _debug("--- attempting mount %s -o %s ---", devname, options);
- mnt = vfs_submount(mntpt, &afs_fs_type, devname, options);
- _debug("--- mount result %p ---", mnt);
-
- free_page((unsigned long) devname);
- free_page((unsigned long) options);
- _leave(" = %p", mnt);
+ put_fs_context(fc);
return mnt;
-
-error:
- put_page(page);
-error_no_page:
- free_page((unsigned long) options);
-error_no_options:
- free_page((unsigned long) devname);
-error_no_devname:
- _leave(" = %d", ret);
- return ERR_PTR(ret);
}
/*
--
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