Commit d1b6c95f authored by Hongbo Li's avatar Hongbo Li Committed by Wentao Guan
Browse files

hostfs: convert hostfs to use the new mount API 

stable inclusion
from stable-v6.6.76
commit d073828fe0f5cd9531bb918ab0b5a7b920b1bfdb
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/IBW08Q

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=d073828fe0f5cd9531bb918ab0b5a7b920b1bfdb



--------------------------------

[ Upstream commit cd140ce9f611a5e9d2a5989a282b75e55c71dab3 ]

Convert the hostfs filesystem to the new internal mount API as the old
one will be obsoleted and removed.  This allows greater flexibility in
communication of mount parameters between userspace, the VFS and the
filesystem.

See Documentation/filesystems/mount_api.txt for more information.

Signed-off-by: default avatarHongbo Li <lihongbo22@huawei.com>
Link: https://lore.kernel.org/r/20240530120111.3794664-1-lihongbo22@huawei.com


Signed-off-by: default avatarChristian Brauner <brauner@kernel.org>
Stable-dep-of: 60a600243244 ("hostfs: fix string handling in __dentry_name()")
Signed-off-by: default avatarSasha Levin <sashal@kernel.org>
(cherry picked from commit d073828fe0f5cd9531bb918ab0b5a7b920b1bfdb)
Signed-off-by: default avatarWentao Guan <guanwentao@uniontech.com>
parent 42cb8653

fs/hostfs/hostfs_kern.c

+62 −21
Original line number Diff line number Diff line
@@ -16,11 +16,16 @@ 
#include <linux/seq_file.h>

#include <linux/writeback.h>

#include <linux/mount.h>

#include <linux/fs_context.h>

#include <linux/namei.h>

#include "hostfs.h"

#include <init.h>

#include <kern.h>



struct hostfs_fs_info {

	char *host_root_path;

};



struct hostfs_inode_info {

	int fd;

	fmode_t mode;
@@ -90,8 +95,10 @@ static char *__dentry_name(struct dentry *dentry, char *name) 
	char *p = dentry_path_raw(dentry, name, PATH_MAX);

	char *root;

	size_t len;

	struct hostfs_fs_info *fsi;



	root = dentry->d_sb->s_fs_info;

	fsi = dentry->d_sb->s_fs_info;

	root = fsi->host_root_path;

	len = strlen(root);

	if (IS_ERR(p)) {

		__putname(name);
@@ -196,8 +203,10 @@ static int hostfs_statfs(struct dentry *dentry, struct kstatfs *sf) 
	long long f_bavail;

	long long f_files;

	long long f_ffree;

	struct hostfs_fs_info *fsi;



	err = do_statfs(dentry->d_sb->s_fs_info,

	fsi = dentry->d_sb->s_fs_info;

	err = do_statfs(fsi->host_root_path,

			&sf->f_bsize, &f_blocks, &f_bfree, &f_bavail, &f_files,

			&f_ffree, &sf->f_fsid, sizeof(sf->f_fsid),

			&sf->f_namelen);
@@ -245,7 +254,11 @@ static void hostfs_free_inode(struct inode *inode) 


static int hostfs_show_options(struct seq_file *seq, struct dentry *root)

{

	const char *root_path = root->d_sb->s_fs_info;

	struct hostfs_fs_info *fsi;

	const char *root_path;



	fsi = root->d_sb->s_fs_info;

	root_path = fsi->host_root_path;

	size_t offset = strlen(root_ino) + 1;



	if (strlen(root_path) > offset)
@@ -924,10 +937,11 @@ static const struct inode_operations hostfs_link_iops = { 
	.get_link	= hostfs_get_link,

};



static int hostfs_fill_sb_common(struct super_block *sb, void *d, int silent)

static int hostfs_fill_super(struct super_block *sb, struct fs_context *fc)

{

	struct hostfs_fs_info *fsi = sb->s_fs_info;

	struct inode *root_inode;

	char *host_root_path, *req_root = d;

	char *host_root = fc->source;

	int err;



	sb->s_blocksize = 1024;
@@ -941,15 +955,15 @@ static int hostfs_fill_sb_common(struct super_block *sb, void *d, int silent) 
		return err;



	/* NULL is printed as '(null)' by printf(): avoid that. */

	if (req_root == NULL)

		req_root = "";

	if (fc->source == NULL)

		host_root = "";



	sb->s_fs_info = host_root_path =

		kasprintf(GFP_KERNEL, "%s/%s", root_ino, req_root);

	if (host_root_path == NULL)

	fsi->host_root_path =

		kasprintf(GFP_KERNEL, "%s/%s", root_ino, host_root);

	if (fsi->host_root_path == NULL)

		return -ENOMEM;



	root_inode = hostfs_iget(sb, host_root_path);

	root_inode = hostfs_iget(sb, fsi->host_root_path);

	if (IS_ERR(root_inode))

		return PTR_ERR(root_inode);
@@ -957,7 +971,7 @@ static int hostfs_fill_sb_common(struct super_block *sb, void *d, int silent) 
		char *name;



		iput(root_inode);

		name = follow_link(host_root_path);

		name = follow_link(fsi->host_root_path);

		if (IS_ERR(name))

			return PTR_ERR(name);
@@ -974,11 +988,38 @@ static int hostfs_fill_sb_common(struct super_block *sb, void *d, int silent) 
	return 0;

}



static struct dentry *hostfs_read_sb(struct file_system_type *type,

			  int flags, const char *dev_name,

			  void *data)

static int hostfs_fc_get_tree(struct fs_context *fc)

{

	return mount_nodev(type, flags, data, hostfs_fill_sb_common);

	return get_tree_nodev(fc, hostfs_fill_super);

}



static void hostfs_fc_free(struct fs_context *fc)

{

	struct hostfs_fs_info *fsi = fc->s_fs_info;



	if (!fsi)

		return;



	kfree(fsi->host_root_path);

	kfree(fsi);

}



static const struct fs_context_operations hostfs_context_ops = {

	.get_tree	= hostfs_fc_get_tree,

	.free		= hostfs_fc_free,

};



static int hostfs_init_fs_context(struct fs_context *fc)

{

	struct hostfs_fs_info *fsi;



	fsi = kzalloc(sizeof(*fsi), GFP_KERNEL);

	if (!fsi)

		return -ENOMEM;



	fc->s_fs_info = fsi;

	fc->ops = &hostfs_context_ops;

	return 0;

}



static void hostfs_kill_sb(struct super_block *s)
@@ -990,7 +1031,7 @@ static void hostfs_kill_sb(struct super_block *s) 
static struct file_system_type hostfs_type = {

	.owner			= THIS_MODULE,

	.name			= "hostfs",

	.mount	 	= hostfs_read_sb,

	.init_fs_context	= hostfs_init_fs_context,

	.kill_sb		= hostfs_kill_sb,

	.fs_flags		= 0,

};