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sockfs: Get rid of getxattr iop

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If we allow pseudo-filesystems created with mount_pseudo to have xattr
handlers, we can replace sockfs_getxattr with a sockfs_xattr_get handler
to use the xattr handler name parsing.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Andreas Gruenbacher 2016-09-29 17:48:35 +02:00 committed by Al Viro
parent 971df15bd5
commit bba0bd31b1
3 changed files with 47 additions and 27 deletions
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7
fs/libfs.c
View File

@ -236,8 +236,8 @@ static const struct super_operations simple_super_operations = {
* Common helper for pseudo-filesystems (sockfs, pipefs, bdev - stuff that
* will never be mountable)
*/
struct dentry *mount_pseudo(struct file_system_type *fs_type, char *name,
const struct super_operations *ops,
struct dentry *mount_pseudo_xattr(struct file_system_type *fs_type, char *name,
const struct super_operations *ops, const struct xattr_handler **xattr,
const struct dentry_operations *dops, unsigned long magic)
{
struct super_block *s;
@ -254,6 +254,7 @@ struct dentry *mount_pseudo(struct file_system_type *fs_type, char *name,
s->s_blocksize_bits = PAGE_SHIFT;
s->s_magic = magic;
s->s_op = ops ? ops : &simple_super_operations;
s->s_xattr = xattr;
s->s_time_gran = 1;
root = new_inode(s);
if (!root)
@ -281,7 +282,7 @@ Enomem:
deactivate_locked_super(s);
return ERR_PTR(-ENOMEM);
}
EXPORT_SYMBOL(mount_pseudo);
EXPORT_SYMBOL(mount_pseudo_xattr);
int simple_open(struct inode *inode, struct file *file)
{

17
include/linux/fs.h
View File

@ -2075,10 +2075,19 @@ struct super_block *sget(struct file_system_type *type,
int (*test)(struct super_block *,void *),
int (*set)(struct super_block *,void *),
int flags, void *data);
extern struct dentry *mount_pseudo(struct file_system_type *, char *,
const struct super_operations *ops,
const struct dentry_operations *dops,
unsigned long);
extern struct dentry *mount_pseudo_xattr(struct file_system_type *, char *,
const struct super_operations *ops,
const struct xattr_handler **xattr,
const struct dentry_operations *dops,
unsigned long);
static inline struct dentry *
mount_pseudo(struct file_system_type *fs_type, char *name,
const struct super_operations *ops,
const struct dentry_operations *dops, unsigned long magic)
{
return mount_pseudo_xattr(fs_type, name, ops, NULL, dops, magic);
}
/* Alas, no aliases. Too much hassle with bringing module.h everywhere */
#define fops_get(fops) \

50
net/socket.c
View File

@ -320,11 +320,38 @@ static const struct dentry_operations sockfs_dentry_operations = {
.d_dname = sockfs_dname,
};
static int sockfs_xattr_get(const struct xattr_handler *handler,
struct dentry *dentry, struct inode *inode,
const char *suffix, void *value, size_t size)
{
if (value) {
if (dentry->d_name.len + 1 > size)
return -ERANGE;
memcpy(value, dentry->d_name.name, dentry->d_name.len + 1);
}
return dentry->d_name.len + 1;
}
#define XATTR_SOCKPROTONAME_SUFFIX "sockprotoname"
#define XATTR_NAME_SOCKPROTONAME (XATTR_SYSTEM_PREFIX XATTR_SOCKPROTONAME_SUFFIX)
#define XATTR_NAME_SOCKPROTONAME_LEN (sizeof(XATTR_NAME_SOCKPROTONAME)-1)
static const struct xattr_handler sockfs_xattr_handler = {
.name = XATTR_NAME_SOCKPROTONAME,
.get = sockfs_xattr_get,
};
static const struct xattr_handler *sockfs_xattr_handlers[] = {
&sockfs_xattr_handler,
NULL
};
static struct dentry *sockfs_mount(struct file_system_type *fs_type,
int flags, const char *dev_name, void *data)
{
return mount_pseudo(fs_type, "socket:", &sockfs_ops,
&sockfs_dentry_operations, SOCKFS_MAGIC);
return mount_pseudo_xattr(fs_type, "socket:", &sockfs_ops,
sockfs_xattr_handlers,
&sockfs_dentry_operations, SOCKFS_MAGIC);
}
static struct vfsmount *sock_mnt __read_mostly;
@ -463,23 +490,6 @@ static struct socket *sockfd_lookup_light(int fd, int *err, int *fput_needed)
return NULL;
}
#define XATTR_SOCKPROTONAME_SUFFIX "sockprotoname"
#define XATTR_NAME_SOCKPROTONAME (XATTR_SYSTEM_PREFIX XATTR_SOCKPROTONAME_SUFFIX)
#define XATTR_NAME_SOCKPROTONAME_LEN (sizeof(XATTR_NAME_SOCKPROTONAME)-1)
static ssize_t sockfs_getxattr(struct dentry *dentry, struct inode *inode,
const char *name, void *value, size_t size)
{
if (!strcmp(name, XATTR_NAME_SOCKPROTONAME)) {
if (value) {
if (dentry->d_name.len + 1 > size)
return -ERANGE;
memcpy(value, dentry->d_name.name, dentry->d_name.len + 1);
}
return dentry->d_name.len + 1;
}
return -EOPNOTSUPP;
}
static ssize_t sockfs_listxattr(struct dentry *dentry, char *buffer,
size_t size)
{
@ -509,7 +519,7 @@ static ssize_t sockfs_listxattr(struct dentry *dentry, char *buffer,
}
static const struct inode_operations sockfs_inode_ops = {
.getxattr = sockfs_getxattr,
.getxattr = generic_getxattr,
.listxattr = sockfs_listxattr,
};