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authorPaulo Alcantara <pc@cjr.nz>2022-12-18 20:37:32 +0300
committerSteve French <stfrench@microsoft.com>2022-12-19 17:03:12 +0300
commit7ad54b98fc1f141cfb70cfe2a3d6def5a85169ff (patch)
tree6eb49be25d7938696cb4796d5a46c9a56ca6fc56 /fs
parent25cf01b7c9200d6ace5a59125d8166435dd9dea7 (diff)
downloadlinux-7ad54b98fc1f141cfb70cfe2a3d6def5a85169ff.tar.xz
cifs: use origin fullpath for automounts
Use TCP_Server_Info::origin_fullpath instead of cifs_tcon::tree_name when building source paths for automounts as it will be useful for domain-based DFS referrals where the connections and referrals would get either re-used from the cache or re-created when chasing the dfs link. Signed-off-by: Paulo Alcantara (SUSE) <pc@cjr.nz> Signed-off-by: Steve French <stfrench@microsoft.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/cifs/cifs_dfs_ref.c24
-rw-r--r--fs/cifs/cifsproto.h3
-rw-r--r--fs/cifs/dfs.h15
-rw-r--r--fs/cifs/dir.c21
4 files changed, 53 insertions, 10 deletions
diff --git a/fs/cifs/cifs_dfs_ref.c b/fs/cifs/cifs_dfs_ref.c
index cae8a52c6d9a..2b1a8d55b4ec 100644
--- a/fs/cifs/cifs_dfs_ref.c
+++ b/fs/cifs/cifs_dfs_ref.c
@@ -21,8 +21,7 @@
#include "cifsfs.h"
#include "dns_resolve.h"
#include "cifs_debug.h"
-#include "cifs_unicode.h"
-#include "dfs_cache.h"
+#include "dfs.h"
#include "fs_context.h"
static LIST_HEAD(cifs_dfs_automount_list);
@@ -119,6 +118,17 @@ cifs_build_devname(char *nodename, const char *prepath)
return dev;
}
+static int set_dest_addr(struct smb3_fs_context *ctx, const char *full_path)
+{
+ struct sockaddr *addr = (struct sockaddr *)&ctx->dstaddr;
+ int rc;
+
+ rc = dns_resolve_server_name_to_ip(full_path, addr, NULL);
+ if (!rc)
+ cifs_set_port(addr, ctx->port);
+ return rc;
+}
+
/*
* Create a vfsmount that we can automount
*/
@@ -156,8 +166,7 @@ static struct vfsmount *cifs_dfs_do_automount(struct path *path)
ctx = smb3_fc2context(fc);
page = alloc_dentry_path();
- /* always use tree name prefix */
- full_path = build_path_from_dentry_optional_prefix(mntpt, page, true);
+ full_path = dfs_get_automount_devname(mntpt, page);
if (IS_ERR(full_path)) {
mnt = ERR_CAST(full_path);
goto out;
@@ -168,6 +177,7 @@ static struct vfsmount *cifs_dfs_do_automount(struct path *path)
tmp = *cur_ctx;
tmp.source = full_path;
+ tmp.leaf_fullpath = NULL;
tmp.UNC = tmp.prepath = NULL;
rc = smb3_fs_context_dup(ctx, &tmp);
@@ -176,6 +186,12 @@ static struct vfsmount *cifs_dfs_do_automount(struct path *path)
goto out;
}
+ rc = set_dest_addr(ctx, full_path);
+ if (rc) {
+ mnt = ERR_PTR(rc);
+ goto out;
+ }
+
rc = smb3_parse_devname(full_path, ctx);
if (!rc)
mnt = fc_mount(fc);
diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h
index 4efe1bc9783e..1207b39686fb 100644
--- a/fs/cifs/cifsproto.h
+++ b/fs/cifs/cifsproto.h
@@ -57,6 +57,9 @@ extern void exit_cifs_idmap(void);
extern int init_cifs_spnego(void);
extern void exit_cifs_spnego(void);
extern const char *build_path_from_dentry(struct dentry *, void *);
+char *__build_path_from_dentry_optional_prefix(struct dentry *direntry, void *page,
+ const char *tree, int tree_len,
+ bool prefix);
extern char *build_path_from_dentry_optional_prefix(struct dentry *direntry,
void *page, bool prefix);
static inline void *alloc_dentry_path(void)
diff --git a/fs/cifs/dfs.h b/fs/cifs/dfs.h
index bbe2ec25b0c2..344bea6d8bab 100644
--- a/fs/cifs/dfs.h
+++ b/fs/cifs/dfs.h
@@ -28,4 +28,19 @@ static inline int dfs_get_referral(struct cifs_mount_ctx *mnt_ctx, const char *p
cifs_remap(cifs_sb), path, ref, tl);
}
+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;
+
+ if (unlikely(!server->origin_fullpath))
+ return ERR_PTR(-EREMOTE);
+
+ return __build_path_from_dentry_optional_prefix(dentry, page,
+ server->origin_fullpath,
+ strlen(server->origin_fullpath),
+ true);
+}
+
#endif /* _CIFS_DFS_H */
diff --git a/fs/cifs/dir.c b/fs/cifs/dir.c
index 8b1c37158556..ad4208bf1e32 100644
--- a/fs/cifs/dir.c
+++ b/fs/cifs/dir.c
@@ -78,14 +78,13 @@ build_path_from_dentry(struct dentry *direntry, void *page)
prefix);
}
-char *
-build_path_from_dentry_optional_prefix(struct dentry *direntry, void *page,
- bool prefix)
+char *__build_path_from_dentry_optional_prefix(struct dentry *direntry, void *page,
+ const char *tree, int tree_len,
+ bool prefix)
{
int dfsplen;
int pplen = 0;
struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
- struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
char dirsep = CIFS_DIR_SEP(cifs_sb);
char *s;
@@ -93,7 +92,7 @@ build_path_from_dentry_optional_prefix(struct dentry *direntry, void *page,
return ERR_PTR(-ENOMEM);
if (prefix)
- dfsplen = strnlen(tcon->tree_name, MAX_TREE_SIZE + 1);
+ dfsplen = strnlen(tree, tree_len + 1);
else
dfsplen = 0;
@@ -123,7 +122,7 @@ build_path_from_dentry_optional_prefix(struct dentry *direntry, void *page,
}
if (dfsplen) {
s -= dfsplen;
- memcpy(s, tcon->tree_name, dfsplen);
+ memcpy(s, tree, dfsplen);
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) {
int i;
for (i = 0; i < dfsplen; i++) {
@@ -135,6 +134,16 @@ build_path_from_dentry_optional_prefix(struct dentry *direntry, void *page,
return s;
}
+char *build_path_from_dentry_optional_prefix(struct dentry *direntry, void *page,
+ bool prefix)
+{
+ struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
+ struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
+
+ return __build_path_from_dentry_optional_prefix(direntry, page, tcon->tree_name,
+ MAX_TREE_SIZE, prefix);
+}
+
/*
* Don't allow path components longer than the server max.
* Don't allow the separator character in a path component.