mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-09-22 22:11:38 +08:00
d5a863a153
@server->origin_fullpath already contains the tree name + optional
prefix, so avoid calling __build_path_from_dentry_optional_prefix() as
it might end up duplicating prefix path from @cifs_sb->prepath into
final full path.
Instead, generate DFS full path by simply merging
@server->origin_fullpath with dentry's path.
This fixes the following case
mount.cifs //root/dfs/dir /mnt/ -o ...
ls /mnt/link
where cifs_dfs_do_automount() will call smb3_parse_devname() with
@devname set to "//root/dfs/dir/link" instead of
"//root/dfs/dir/dir/link".
Fixes: 7ad54b98fc ("cifs: use origin fullpath for automounts")
Cc: <stable@vger.kernel.org> # 6.2+
Signed-off-by: Paulo Alcantara (SUSE) <pc@manguebit.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
78 lines
2.0 KiB
C
78 lines
2.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/*
|
|
* Copyright (c) 2022 Paulo Alcantara <palcantara@suse.de>
|
|
*/
|
|
|
|
#ifndef _CIFS_DFS_H
|
|
#define _CIFS_DFS_H
|
|
|
|
#include "cifsglob.h"
|
|
#include "fs_context.h"
|
|
#include "cifs_unicode.h"
|
|
|
|
struct dfs_root_ses {
|
|
struct list_head list;
|
|
struct cifs_ses *ses;
|
|
};
|
|
|
|
int dfs_parse_target_referral(const char *full_path, const struct dfs_info3_param *ref,
|
|
struct smb3_fs_context *ctx);
|
|
int dfs_mount_share(struct cifs_mount_ctx *mnt_ctx, bool *isdfs);
|
|
|
|
static inline char *dfs_get_path(struct cifs_sb_info *cifs_sb, const char *path)
|
|
{
|
|
return dfs_cache_canonical_path(path, cifs_sb->local_nls, cifs_remap(cifs_sb));
|
|
}
|
|
|
|
static inline int dfs_get_referral(struct cifs_mount_ctx *mnt_ctx, const char *path,
|
|
struct dfs_info3_param *ref, struct dfs_cache_tgt_list *tl)
|
|
{
|
|
struct smb3_fs_context *ctx = mnt_ctx->fs_ctx;
|
|
struct cifs_sb_info *cifs_sb = mnt_ctx->cifs_sb;
|
|
|
|
return dfs_cache_find(mnt_ctx->xid, ctx->dfs_root_ses, cifs_sb->local_nls,
|
|
cifs_remap(cifs_sb), path, ref, tl);
|
|
}
|
|
|
|
/* Return DFS full path out of a dentry set for automount */
|
|
static inline char *dfs_get_automount_devname(struct dentry *dentry, void *page)
|
|
{
|
|
struct cifs_sb_info *cifs_sb = CIFS_SB(dentry->d_sb);
|
|
struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
|
|
struct TCP_Server_Info *server = tcon->ses->server;
|
|
size_t len;
|
|
char *s;
|
|
|
|
if (unlikely(!server->origin_fullpath))
|
|
return ERR_PTR(-EREMOTE);
|
|
|
|
s = dentry_path_raw(dentry, page, PATH_MAX);
|
|
if (IS_ERR(s))
|
|
return s;
|
|
/* for root, we want "" */
|
|
if (!s[1])
|
|
s++;
|
|
|
|
len = strlen(server->origin_fullpath);
|
|
if (s < (char *)page + len)
|
|
return ERR_PTR(-ENAMETOOLONG);
|
|
|
|
s -= len;
|
|
memcpy(s, server->origin_fullpath, len);
|
|
convert_delimiter(s, '/');
|
|
return s;
|
|
}
|
|
|
|
static inline void dfs_put_root_smb_sessions(struct list_head *head)
|
|
{
|
|
struct dfs_root_ses *root, *tmp;
|
|
|
|
list_for_each_entry_safe(root, tmp, head, list) {
|
|
list_del_init(&root->list);
|
|
cifs_put_smb_ses(root->ses);
|
|
kfree(root);
|
|
}
|
|
}
|
|
|
|
#endif /* _CIFS_DFS_H */
|