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699 lines
17 KiB
699 lines
17 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* Provide a way to create a superblock configuration context within the kernel |
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* that allows a superblock to be set up prior to mounting. |
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* |
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* Copyright (C) 2017 Red Hat, Inc. All Rights Reserved. |
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* Written by David Howells ([email protected]) |
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*/ |
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|
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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#include <linux/module.h> |
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#include <linux/fs_context.h> |
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#include <linux/fs_parser.h> |
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#include <linux/fs.h> |
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#include <linux/mount.h> |
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#include <linux/nsproxy.h> |
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#include <linux/slab.h> |
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#include <linux/magic.h> |
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#include <linux/security.h> |
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#include <linux/mnt_namespace.h> |
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#include <linux/pid_namespace.h> |
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#include <linux/user_namespace.h> |
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#include <net/net_namespace.h> |
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#include <asm/sections.h> |
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#include "mount.h" |
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#include "internal.h" |
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|
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enum legacy_fs_param { |
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LEGACY_FS_UNSET_PARAMS, |
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LEGACY_FS_MONOLITHIC_PARAMS, |
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LEGACY_FS_INDIVIDUAL_PARAMS, |
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}; |
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|
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struct legacy_fs_context { |
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char *legacy_data; /* Data page for legacy filesystems */ |
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size_t data_size; |
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enum legacy_fs_param param_type; |
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}; |
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|
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static int legacy_init_fs_context(struct fs_context *fc); |
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|
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static const struct constant_table common_set_sb_flag[] = { |
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{ "dirsync", SB_DIRSYNC }, |
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{ "lazytime", SB_LAZYTIME }, |
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{ "mand", SB_MANDLOCK }, |
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{ "ro", SB_RDONLY }, |
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{ "sync", SB_SYNCHRONOUS }, |
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{ }, |
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}; |
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|
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static const struct constant_table common_clear_sb_flag[] = { |
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{ "async", SB_SYNCHRONOUS }, |
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{ "nolazytime", SB_LAZYTIME }, |
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{ "nomand", SB_MANDLOCK }, |
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{ "rw", SB_RDONLY }, |
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{ }, |
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}; |
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|
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/* |
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* Check for a common mount option that manipulates s_flags. |
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*/ |
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static int vfs_parse_sb_flag(struct fs_context *fc, const char *key) |
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{ |
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unsigned int token; |
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|
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token = lookup_constant(common_set_sb_flag, key, 0); |
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if (token) { |
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fc->sb_flags |= token; |
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fc->sb_flags_mask |= token; |
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return 0; |
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} |
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token = lookup_constant(common_clear_sb_flag, key, 0); |
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if (token) { |
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fc->sb_flags &= ~token; |
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fc->sb_flags_mask |= token; |
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return 0; |
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} |
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|
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return -ENOPARAM; |
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} |
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|
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/** |
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* vfs_parse_fs_param - Add a single parameter to a superblock config |
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* @fc: The filesystem context to modify |
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* @param: The parameter |
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* |
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* A single mount option in string form is applied to the filesystem context |
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* being set up. Certain standard options (for example "ro") are translated |
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* into flag bits without going to the filesystem. The active security module |
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* is allowed to observe and poach options. Any other options are passed over |
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* to the filesystem to parse. |
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* |
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* This may be called multiple times for a context. |
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* |
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* Returns 0 on success and a negative error code on failure. In the event of |
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* failure, supplementary error information may have been set. |
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*/ |
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int vfs_parse_fs_param(struct fs_context *fc, struct fs_parameter *param) |
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{ |
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int ret; |
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|
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if (!param->key) |
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return invalf(fc, "Unnamed parameter\n"); |
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|
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ret = vfs_parse_sb_flag(fc, param->key); |
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if (ret != -ENOPARAM) |
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return ret; |
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|
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ret = security_fs_context_parse_param(fc, param); |
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if (ret != -ENOPARAM) |
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/* Param belongs to the LSM or is disallowed by the LSM; so |
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* don't pass to the FS. |
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*/ |
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return ret; |
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|
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if (fc->ops->parse_param) { |
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ret = fc->ops->parse_param(fc, param); |
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if (ret != -ENOPARAM) |
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return ret; |
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} |
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|
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/* If the filesystem doesn't take any arguments, give it the |
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* default handling of source. |
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*/ |
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if (strcmp(param->key, "source") == 0) { |
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if (param->type != fs_value_is_string) |
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return invalf(fc, "VFS: Non-string source"); |
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if (fc->source) |
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return invalf(fc, "VFS: Multiple sources"); |
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fc->source = param->string; |
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param->string = NULL; |
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return 0; |
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} |
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|
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return invalf(fc, "%s: Unknown parameter '%s'", |
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fc->fs_type->name, param->key); |
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} |
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EXPORT_SYMBOL(vfs_parse_fs_param); |
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|
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/** |
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* vfs_parse_fs_string - Convenience function to just parse a string. |
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*/ |
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int vfs_parse_fs_string(struct fs_context *fc, const char *key, |
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const char *value, size_t v_size) |
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{ |
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int ret; |
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struct fs_parameter param = { |
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.key = key, |
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.type = fs_value_is_flag, |
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.size = v_size, |
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}; |
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if (value) { |
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param.string = kmemdup_nul(value, v_size, GFP_KERNEL); |
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if (!param.string) |
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return -ENOMEM; |
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param.type = fs_value_is_string; |
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} |
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ret = vfs_parse_fs_param(fc, ¶m); |
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kfree(param.string); |
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return ret; |
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} |
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EXPORT_SYMBOL(vfs_parse_fs_string); |
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|
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/** |
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* generic_parse_monolithic - Parse key[=val][,key[=val]]* mount data |
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* @ctx: The superblock configuration to fill in. |
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* @data: The data to parse |
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* |
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* Parse a blob of data that's in key[=val][,key[=val]]* form. This can be |
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* called from the ->monolithic_mount_data() fs_context operation. |
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* |
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* Returns 0 on success or the error returned by the ->parse_option() fs_context |
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* operation on failure. |
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*/ |
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int generic_parse_monolithic(struct fs_context *fc, void *data) |
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{ |
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char *options = data, *key; |
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int ret = 0; |
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if (!options) |
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return 0; |
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ret = security_sb_eat_lsm_opts(options, &fc->security); |
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if (ret) |
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return ret; |
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while ((key = strsep(&options, ",")) != NULL) { |
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if (*key) { |
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size_t v_len = 0; |
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char *value = strchr(key, '='); |
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|
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if (value) { |
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if (value == key) |
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continue; |
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*value++ = 0; |
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v_len = strlen(value); |
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} |
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ret = vfs_parse_fs_string(fc, key, value, v_len); |
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if (ret < 0) |
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break; |
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} |
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} |
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return ret; |
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} |
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EXPORT_SYMBOL(generic_parse_monolithic); |
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|
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/** |
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* alloc_fs_context - Create a filesystem context. |
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* @fs_type: The filesystem type. |
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* @reference: The dentry from which this one derives (or NULL) |
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* @sb_flags: Filesystem/superblock flags (SB_*) |
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* @sb_flags_mask: Applicable members of @sb_flags |
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* @purpose: The purpose that this configuration shall be used for. |
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* |
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* Open a filesystem and create a mount context. The mount context is |
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* initialised with the supplied flags and, if a submount/automount from |
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* another superblock (referred to by @reference) is supplied, may have |
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* parameters such as namespaces copied across from that superblock. |
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*/ |
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static struct fs_context *alloc_fs_context(struct file_system_type *fs_type, |
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struct dentry *reference, |
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unsigned int sb_flags, |
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unsigned int sb_flags_mask, |
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enum fs_context_purpose purpose) |
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{ |
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int (*init_fs_context)(struct fs_context *); |
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struct fs_context *fc; |
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int ret = -ENOMEM; |
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fc = kzalloc(sizeof(struct fs_context), GFP_KERNEL); |
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if (!fc) |
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return ERR_PTR(-ENOMEM); |
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fc->purpose = purpose; |
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fc->sb_flags = sb_flags; |
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fc->sb_flags_mask = sb_flags_mask; |
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fc->fs_type = get_filesystem(fs_type); |
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fc->cred = get_current_cred(); |
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fc->net_ns = get_net(current->nsproxy->net_ns); |
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fc->log.prefix = fs_type->name; |
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mutex_init(&fc->uapi_mutex); |
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switch (purpose) { |
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case FS_CONTEXT_FOR_MOUNT: |
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fc->user_ns = get_user_ns(fc->cred->user_ns); |
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break; |
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case FS_CONTEXT_FOR_SUBMOUNT: |
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fc->user_ns = get_user_ns(reference->d_sb->s_user_ns); |
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break; |
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case FS_CONTEXT_FOR_RECONFIGURE: |
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atomic_inc(&reference->d_sb->s_active); |
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fc->user_ns = get_user_ns(reference->d_sb->s_user_ns); |
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fc->root = dget(reference); |
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break; |
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} |
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/* TODO: Make all filesystems support this unconditionally */ |
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init_fs_context = fc->fs_type->init_fs_context; |
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if (!init_fs_context) |
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init_fs_context = legacy_init_fs_context; |
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ret = init_fs_context(fc); |
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if (ret < 0) |
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goto err_fc; |
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fc->need_free = true; |
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return fc; |
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err_fc: |
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put_fs_context(fc); |
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return ERR_PTR(ret); |
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} |
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struct fs_context *fs_context_for_mount(struct file_system_type *fs_type, |
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unsigned int sb_flags) |
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{ |
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return alloc_fs_context(fs_type, NULL, sb_flags, 0, |
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FS_CONTEXT_FOR_MOUNT); |
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} |
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EXPORT_SYMBOL(fs_context_for_mount); |
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struct fs_context *fs_context_for_reconfigure(struct dentry *dentry, |
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unsigned int sb_flags, |
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unsigned int sb_flags_mask) |
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{ |
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return alloc_fs_context(dentry->d_sb->s_type, dentry, sb_flags, |
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sb_flags_mask, FS_CONTEXT_FOR_RECONFIGURE); |
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} |
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EXPORT_SYMBOL(fs_context_for_reconfigure); |
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struct fs_context *fs_context_for_submount(struct file_system_type *type, |
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struct dentry *reference) |
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{ |
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return alloc_fs_context(type, reference, 0, 0, FS_CONTEXT_FOR_SUBMOUNT); |
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} |
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EXPORT_SYMBOL(fs_context_for_submount); |
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void fc_drop_locked(struct fs_context *fc) |
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{ |
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struct super_block *sb = fc->root->d_sb; |
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dput(fc->root); |
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fc->root = NULL; |
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deactivate_locked_super(sb); |
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} |
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static void legacy_fs_context_free(struct fs_context *fc); |
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/** |
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* vfs_dup_fc_config: Duplicate a filesystem context. |
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* @src_fc: The context to copy. |
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*/ |
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struct fs_context *vfs_dup_fs_context(struct fs_context *src_fc) |
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{ |
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struct fs_context *fc; |
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int ret; |
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if (!src_fc->ops->dup) |
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return ERR_PTR(-EOPNOTSUPP); |
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fc = kmemdup(src_fc, sizeof(struct fs_context), GFP_KERNEL); |
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if (!fc) |
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return ERR_PTR(-ENOMEM); |
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mutex_init(&fc->uapi_mutex); |
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fc->fs_private = NULL; |
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fc->s_fs_info = NULL; |
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fc->source = NULL; |
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fc->security = NULL; |
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get_filesystem(fc->fs_type); |
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get_net(fc->net_ns); |
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get_user_ns(fc->user_ns); |
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get_cred(fc->cred); |
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if (fc->log.log) |
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refcount_inc(&fc->log.log->usage); |
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/* Can't call put until we've called ->dup */ |
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ret = fc->ops->dup(fc, src_fc); |
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if (ret < 0) |
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goto err_fc; |
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ret = security_fs_context_dup(fc, src_fc); |
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if (ret < 0) |
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goto err_fc; |
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return fc; |
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err_fc: |
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put_fs_context(fc); |
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return ERR_PTR(ret); |
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} |
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EXPORT_SYMBOL(vfs_dup_fs_context); |
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/** |
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* logfc - Log a message to a filesystem context |
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* @fc: The filesystem context to log to. |
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* @fmt: The format of the buffer. |
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*/ |
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void logfc(struct fc_log *log, const char *prefix, char level, const char *fmt, ...) |
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{ |
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va_list va; |
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struct va_format vaf = {.fmt = fmt, .va = &va}; |
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va_start(va, fmt); |
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if (!log) { |
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switch (level) { |
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case 'w': |
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printk(KERN_WARNING "%s%s%pV\n", prefix ? prefix : "", |
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prefix ? ": " : "", &vaf); |
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break; |
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case 'e': |
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printk(KERN_ERR "%s%s%pV\n", prefix ? prefix : "", |
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prefix ? ": " : "", &vaf); |
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break; |
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default: |
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printk(KERN_NOTICE "%s%s%pV\n", prefix ? prefix : "", |
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prefix ? ": " : "", &vaf); |
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break; |
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} |
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} else { |
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unsigned int logsize = ARRAY_SIZE(log->buffer); |
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u8 index; |
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char *q = kasprintf(GFP_KERNEL, "%c %s%s%pV\n", level, |
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prefix ? prefix : "", |
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prefix ? ": " : "", &vaf); |
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index = log->head & (logsize - 1); |
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BUILD_BUG_ON(sizeof(log->head) != sizeof(u8) || |
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sizeof(log->tail) != sizeof(u8)); |
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if ((u8)(log->head - log->tail) == logsize) { |
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/* The buffer is full, discard the oldest message */ |
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if (log->need_free & (1 << index)) |
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kfree(log->buffer[index]); |
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log->tail++; |
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} |
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log->buffer[index] = q ? q : "OOM: Can't store error string"; |
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if (q) |
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log->need_free |= 1 << index; |
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else |
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log->need_free &= ~(1 << index); |
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log->head++; |
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} |
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va_end(va); |
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} |
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EXPORT_SYMBOL(logfc); |
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/* |
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* Free a logging structure. |
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*/ |
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static void put_fc_log(struct fs_context *fc) |
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{ |
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struct fc_log *log = fc->log.log; |
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int i; |
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if (log) { |
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if (refcount_dec_and_test(&log->usage)) { |
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fc->log.log = NULL; |
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for (i = 0; i <= 7; i++) |
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if (log->need_free & (1 << i)) |
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kfree(log->buffer[i]); |
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kfree(log); |
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} |
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} |
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} |
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/** |
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* put_fs_context - Dispose of a superblock configuration context. |
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* @fc: The context to dispose of. |
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*/ |
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void put_fs_context(struct fs_context *fc) |
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{ |
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struct super_block *sb; |
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if (fc->root) { |
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sb = fc->root->d_sb; |
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dput(fc->root); |
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fc->root = NULL; |
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deactivate_super(sb); |
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} |
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if (fc->need_free && fc->ops && fc->ops->free) |
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fc->ops->free(fc); |
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security_free_mnt_opts(&fc->security); |
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put_net(fc->net_ns); |
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put_user_ns(fc->user_ns); |
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put_cred(fc->cred); |
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put_fc_log(fc); |
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put_filesystem(fc->fs_type); |
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kfree(fc->source); |
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kfree(fc); |
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} |
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EXPORT_SYMBOL(put_fs_context); |
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|
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/* |
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* Free the config for a filesystem that doesn't support fs_context. |
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*/ |
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static void legacy_fs_context_free(struct fs_context *fc) |
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{ |
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struct legacy_fs_context *ctx = fc->fs_private; |
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|
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if (ctx) { |
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if (ctx->param_type == LEGACY_FS_INDIVIDUAL_PARAMS) |
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kfree(ctx->legacy_data); |
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kfree(ctx); |
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} |
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} |
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/* |
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* Duplicate a legacy config. |
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*/ |
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static int legacy_fs_context_dup(struct fs_context *fc, struct fs_context *src_fc) |
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{ |
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struct legacy_fs_context *ctx; |
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struct legacy_fs_context *src_ctx = src_fc->fs_private; |
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ctx = kmemdup(src_ctx, sizeof(*src_ctx), GFP_KERNEL); |
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if (!ctx) |
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return -ENOMEM; |
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|
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if (ctx->param_type == LEGACY_FS_INDIVIDUAL_PARAMS) { |
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ctx->legacy_data = kmemdup(src_ctx->legacy_data, |
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src_ctx->data_size, GFP_KERNEL); |
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if (!ctx->legacy_data) { |
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kfree(ctx); |
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return -ENOMEM; |
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} |
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} |
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fc->fs_private = ctx; |
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return 0; |
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} |
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|
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/* |
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* Add a parameter to a legacy config. We build up a comma-separated list of |
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* options. |
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*/ |
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static int legacy_parse_param(struct fs_context *fc, struct fs_parameter *param) |
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{ |
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struct legacy_fs_context *ctx = fc->fs_private; |
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unsigned int size = ctx->data_size; |
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size_t len = 0; |
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if (strcmp(param->key, "source") == 0) { |
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if (param->type != fs_value_is_string) |
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return invalf(fc, "VFS: Legacy: Non-string source"); |
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if (fc->source) |
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return invalf(fc, "VFS: Legacy: Multiple sources"); |
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fc->source = param->string; |
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param->string = NULL; |
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return 0; |
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} |
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|
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if (ctx->param_type == LEGACY_FS_MONOLITHIC_PARAMS) |
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return invalf(fc, "VFS: Legacy: Can't mix monolithic and individual options"); |
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|
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switch (param->type) { |
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case fs_value_is_string: |
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len = 1 + param->size; |
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fallthrough; |
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case fs_value_is_flag: |
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len += strlen(param->key); |
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break; |
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default: |
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return invalf(fc, "VFS: Legacy: Parameter type for '%s' not supported", |
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param->key); |
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} |
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|
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if (len > PAGE_SIZE - 2 - size) |
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return invalf(fc, "VFS: Legacy: Cumulative options too large"); |
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if (strchr(param->key, ',') || |
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(param->type == fs_value_is_string && |
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memchr(param->string, ',', param->size))) |
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return invalf(fc, "VFS: Legacy: Option '%s' contained comma", |
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param->key); |
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if (!ctx->legacy_data) { |
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ctx->legacy_data = kmalloc(PAGE_SIZE, GFP_KERNEL); |
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if (!ctx->legacy_data) |
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return -ENOMEM; |
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} |
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|
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ctx->legacy_data[size++] = ','; |
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len = strlen(param->key); |
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memcpy(ctx->legacy_data + size, param->key, len); |
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size += len; |
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if (param->type == fs_value_is_string) { |
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ctx->legacy_data[size++] = '='; |
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memcpy(ctx->legacy_data + size, param->string, param->size); |
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size += param->size; |
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} |
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ctx->legacy_data[size] = '\0'; |
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ctx->data_size = size; |
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ctx->param_type = LEGACY_FS_INDIVIDUAL_PARAMS; |
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return 0; |
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} |
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|
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/* |
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* Add monolithic mount data. |
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*/ |
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static int legacy_parse_monolithic(struct fs_context *fc, void *data) |
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{ |
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struct legacy_fs_context *ctx = fc->fs_private; |
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|
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if (ctx->param_type != LEGACY_FS_UNSET_PARAMS) { |
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pr_warn("VFS: Can't mix monolithic and individual options\n"); |
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return -EINVAL; |
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} |
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|
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ctx->legacy_data = data; |
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ctx->param_type = LEGACY_FS_MONOLITHIC_PARAMS; |
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if (!ctx->legacy_data) |
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return 0; |
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|
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if (fc->fs_type->fs_flags & FS_BINARY_MOUNTDATA) |
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return 0; |
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return security_sb_eat_lsm_opts(ctx->legacy_data, &fc->security); |
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} |
|
|
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/* |
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* Get a mountable root with the legacy mount command. |
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*/ |
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static int legacy_get_tree(struct fs_context *fc) |
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{ |
|
struct legacy_fs_context *ctx = fc->fs_private; |
|
struct super_block *sb; |
|
struct dentry *root; |
|
|
|
root = fc->fs_type->mount(fc->fs_type, fc->sb_flags, |
|
fc->source, ctx->legacy_data); |
|
if (IS_ERR(root)) |
|
return PTR_ERR(root); |
|
|
|
sb = root->d_sb; |
|
BUG_ON(!sb); |
|
|
|
fc->root = root; |
|
return 0; |
|
} |
|
|
|
/* |
|
* Handle remount. |
|
*/ |
|
static int legacy_reconfigure(struct fs_context *fc) |
|
{ |
|
struct legacy_fs_context *ctx = fc->fs_private; |
|
struct super_block *sb = fc->root->d_sb; |
|
|
|
if (!sb->s_op->remount_fs) |
|
return 0; |
|
|
|
return sb->s_op->remount_fs(sb, &fc->sb_flags, |
|
ctx ? ctx->legacy_data : NULL); |
|
} |
|
|
|
const struct fs_context_operations legacy_fs_context_ops = { |
|
.free = legacy_fs_context_free, |
|
.dup = legacy_fs_context_dup, |
|
.parse_param = legacy_parse_param, |
|
.parse_monolithic = legacy_parse_monolithic, |
|
.get_tree = legacy_get_tree, |
|
.reconfigure = legacy_reconfigure, |
|
}; |
|
|
|
/* |
|
* Initialise a legacy context for a filesystem that doesn't support |
|
* fs_context. |
|
*/ |
|
static int legacy_init_fs_context(struct fs_context *fc) |
|
{ |
|
fc->fs_private = kzalloc(sizeof(struct legacy_fs_context), GFP_KERNEL); |
|
if (!fc->fs_private) |
|
return -ENOMEM; |
|
fc->ops = &legacy_fs_context_ops; |
|
return 0; |
|
} |
|
|
|
int parse_monolithic_mount_data(struct fs_context *fc, void *data) |
|
{ |
|
int (*monolithic_mount_data)(struct fs_context *, void *); |
|
|
|
monolithic_mount_data = fc->ops->parse_monolithic; |
|
if (!monolithic_mount_data) |
|
monolithic_mount_data = generic_parse_monolithic; |
|
|
|
return monolithic_mount_data(fc, data); |
|
} |
|
|
|
/* |
|
* Clean up a context after performing an action on it and put it into a state |
|
* from where it can be used to reconfigure a superblock. |
|
* |
|
* Note that here we do only the parts that can't fail; the rest is in |
|
* finish_clean_context() below and in between those fs_context is marked |
|
* FS_CONTEXT_AWAITING_RECONF. The reason for splitup is that after |
|
* successful mount or remount we need to report success to userland. |
|
* Trying to do full reinit (for the sake of possible subsequent remount) |
|
* and failing to allocate memory would've put us into a nasty situation. |
|
* So here we only discard the old state and reinitialization is left |
|
* until we actually try to reconfigure. |
|
*/ |
|
void vfs_clean_context(struct fs_context *fc) |
|
{ |
|
if (fc->need_free && fc->ops && fc->ops->free) |
|
fc->ops->free(fc); |
|
fc->need_free = false; |
|
fc->fs_private = NULL; |
|
fc->s_fs_info = NULL; |
|
fc->sb_flags = 0; |
|
security_free_mnt_opts(&fc->security); |
|
kfree(fc->source); |
|
fc->source = NULL; |
|
|
|
fc->purpose = FS_CONTEXT_FOR_RECONFIGURE; |
|
fc->phase = FS_CONTEXT_AWAITING_RECONF; |
|
} |
|
|
|
int finish_clean_context(struct fs_context *fc) |
|
{ |
|
int error; |
|
|
|
if (fc->phase != FS_CONTEXT_AWAITING_RECONF) |
|
return 0; |
|
|
|
if (fc->fs_type->init_fs_context) |
|
error = fc->fs_type->init_fs_context(fc); |
|
else |
|
error = legacy_init_fs_context(fc); |
|
if (unlikely(error)) { |
|
fc->phase = FS_CONTEXT_FAILED; |
|
return error; |
|
} |
|
fc->need_free = true; |
|
fc->phase = FS_CONTEXT_RECONF_PARAMS; |
|
return 0; |
|
}
|
|
|