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Message-Id: <20200411115422.001067703@linuxfoundation.org>
Date: Sat, 11 Apr 2020 14:09:03 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, Xiubo Li <xiubli@...hat.com>,
Jeff Layton <jlayton@...nel.org>,
Ilya Dryomov <idryomov@...il.com>,
Luis Henriques <lhenriques@...e.com>
Subject: [PATCH 4.9 24/32] ceph: remove the extra slashes in the server path
From: Xiubo Li <xiubli@...hat.com>
commit 4fbc0c711b2464ee1551850b85002faae0b775d5 upstream.
It's possible to pass the mount helper a server path that has more
than one contiguous slash character. For example:
$ mount -t ceph 192.168.195.165:40176:/// /mnt/cephfs/
In the MDS server side the extra slashes of the server path will be
treated as snap dir, and then we can get the following debug logs:
ceph: mount opening path //
ceph: open_root_inode opening '//'
ceph: fill_trace 0000000059b8a3bc is_dentry 0 is_target 1
ceph: alloc_inode 00000000dc4ca00b
ceph: get_inode created new inode 00000000dc4ca00b 1.ffffffffffffffff ino 1
ceph: get_inode on 1=1.ffffffffffffffff got 00000000dc4ca00b
And then when creating any new file or directory under the mount
point, we can hit the following BUG_ON in ceph_fill_trace():
BUG_ON(ceph_snap(dir) != dvino.snap);
Have the client ignore the extra slashes in the server path when
mounting. This will also canonicalize the path, so that identical mounts
can be consilidated.
1) "//mydir1///mydir//"
2) "/mydir1/mydir"
3) "/mydir1/mydir/"
Regardless of the internal treatment of these paths, the kernel still
stores the original string including the leading '/' for presentation
to userland.
URL: https://tracker.ceph.com/issues/42771
Signed-off-by: Xiubo Li <xiubli@...hat.com>
Reviewed-by: Jeff Layton <jlayton@...nel.org>
Signed-off-by: Ilya Dryomov <idryomov@...il.com>
Signed-off-by: Luis Henriques <lhenriques@...e.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
fs/ceph/super.c | 118 ++++++++++++++++++++++++++++++++++++++++++++++----------
1 file changed, 99 insertions(+), 19 deletions(-)
--- a/fs/ceph/super.c
+++ b/fs/ceph/super.c
@@ -85,7 +85,6 @@ static int ceph_statfs(struct dentry *de
return 0;
}
-
static int ceph_sync_fs(struct super_block *sb, int wait)
{
struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
@@ -321,6 +320,73 @@ static int strcmp_null(const char *s1, c
return strcmp(s1, s2);
}
+/**
+ * path_remove_extra_slash - Remove the extra slashes in the server path
+ * @server_path: the server path and could be NULL
+ *
+ * Return NULL if the path is NULL or only consists of "/", or a string
+ * without any extra slashes including the leading slash(es) and the
+ * slash(es) at the end of the server path, such as:
+ * "//dir1////dir2///" --> "dir1/dir2"
+ */
+static char *path_remove_extra_slash(const char *server_path)
+{
+ const char *path = server_path;
+ const char *cur, *end;
+ char *buf, *p;
+ int len;
+
+ /* if the server path is omitted */
+ if (!path)
+ return NULL;
+
+ /* remove all the leading slashes */
+ while (*path == '/')
+ path++;
+
+ /* if the server path only consists of slashes */
+ if (*path == '\0')
+ return NULL;
+
+ len = strlen(path);
+
+ buf = kmalloc(len + 1, GFP_KERNEL);
+ if (!buf)
+ return ERR_PTR(-ENOMEM);
+
+ end = path + len;
+ p = buf;
+ do {
+ cur = strchr(path, '/');
+ if (!cur)
+ cur = end;
+
+ len = cur - path;
+
+ /* including one '/' */
+ if (cur != end)
+ len += 1;
+
+ memcpy(p, path, len);
+ p += len;
+
+ while (cur <= end && *cur == '/')
+ cur++;
+ path = cur;
+ } while (path < end);
+
+ *p = '\0';
+
+ /*
+ * remove the last slash if there has and just to make sure that
+ * we will get something like "dir1/dir2"
+ */
+ if (*(--p) == '/')
+ *p = '\0';
+
+ return buf;
+}
+
static int compare_mount_options(struct ceph_mount_options *new_fsopt,
struct ceph_options *new_opt,
struct ceph_fs_client *fsc)
@@ -328,6 +394,7 @@ static int compare_mount_options(struct
struct ceph_mount_options *fsopt1 = new_fsopt;
struct ceph_mount_options *fsopt2 = fsc->mount_options;
int ofs = offsetof(struct ceph_mount_options, snapdir_name);
+ char *p1, *p2;
int ret;
ret = memcmp(fsopt1, fsopt2, ofs);
@@ -341,7 +408,17 @@ static int compare_mount_options(struct
if (ret)
return ret;
- ret = strcmp_null(fsopt1->server_path, fsopt2->server_path);
+ p1 = path_remove_extra_slash(fsopt1->server_path);
+ if (IS_ERR(p1))
+ return PTR_ERR(p1);
+ p2 = path_remove_extra_slash(fsopt2->server_path);
+ if (IS_ERR(p2)) {
+ kfree(p1);
+ return PTR_ERR(p2);
+ }
+ ret = strcmp_null(p1, p2);
+ kfree(p1);
+ kfree(p2);
if (ret)
return ret;
@@ -396,12 +473,14 @@ static int parse_mount_options(struct ce
*/
dev_name_end = strchr(dev_name, '/');
if (dev_name_end) {
- if (strlen(dev_name_end) > 1) {
- fsopt->server_path = kstrdup(dev_name_end, GFP_KERNEL);
- if (!fsopt->server_path) {
- err = -ENOMEM;
- goto out;
- }
+ /*
+ * The server_path will include the whole chars from userland
+ * including the leading '/'.
+ */
+ fsopt->server_path = kstrdup(dev_name_end, GFP_KERNEL);
+ if (!fsopt->server_path) {
+ err = -ENOMEM;
+ goto out;
}
} else {
dev_name_end = dev_name + strlen(dev_name);
@@ -725,7 +804,6 @@ static void destroy_caches(void)
ceph_fscache_unregister();
}
-
/*
* ceph_umount_begin - initiate forced umount. Tear down down the
* mount, skipping steps that may hang while waiting for server(s).
@@ -812,9 +890,6 @@ out:
return root;
}
-
-
-
/*
* mount: join the ceph cluster, and open root directory.
*/
@@ -828,24 +903,29 @@ static struct dentry *ceph_real_mount(st
mutex_lock(&fsc->client->mount_mutex);
if (!fsc->sb->s_root) {
- const char *path;
+ const char *path, *p;
err = __ceph_open_session(fsc->client, started);
if (err < 0)
goto out;
- if (!fsc->mount_options->server_path) {
- path = "";
- dout("mount opening path \\t\n");
- } else {
- path = fsc->mount_options->server_path + 1;
- dout("mount opening path %s\n", path);
+ p = path_remove_extra_slash(fsc->mount_options->server_path);
+ if (IS_ERR(p)) {
+ err = PTR_ERR(p);
+ goto out;
}
+ /* if the server path is omitted or just consists of '/' */
+ if (!p)
+ path = "";
+ else
+ path = p;
+ dout("mount opening path '%s'\n", path);
err = ceph_fs_debugfs_init(fsc);
if (err < 0)
goto out;
root = open_root_dentry(fsc, path, started);
+ kfree(p);
if (IS_ERR(root)) {
err = PTR_ERR(root);
goto out;
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