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vfs: Convert pipe to use the new mount API

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Convert the pipe 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: David Howells <dhowells@redhat.com>
cc: linux-fsdevel@vger.kernel.org
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
David Howells 2019-03-25 16:38:23 +00:00 committed by Al Viro
parent 059b20d9da
commit 4fa7ec5db7
1 changed files with 10 additions and 5 deletions
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15
fs/pipe.c
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@ -14,6 +14,7 @@
#include <linux/fs.h> #include <linux/fs.h>
#include <linux/log2.h> #include <linux/log2.h>
#include <linux/mount.h> #include <linux/mount.h>
#include <linux/pseudo_fs.h>
#include <linux/magic.h> #include <linux/magic.h>
#include <linux/pipe_fs_i.h> #include <linux/pipe_fs_i.h>
#include <linux/uio.h> #include <linux/uio.h>
@ -1182,16 +1183,20 @@ static const struct super_operations pipefs_ops = {
* any operations on the root directory. However, we need a non-trivial * any operations on the root directory. However, we need a non-trivial
* d_name - pipe: will go nicely and kill the special-casing in procfs. * d_name - pipe: will go nicely and kill the special-casing in procfs.
*/ */
static struct dentry *pipefs_mount(struct file_system_type *fs_type,
int flags, const char *dev_name, void *data) static int pipefs_init_fs_context(struct fs_context *fc)
{ {
return mount_pseudo(fs_type, &pipefs_ops, struct pseudo_fs_context *ctx = init_pseudo(fc, PIPEFS_MAGIC);
&pipefs_dentry_operations, PIPEFS_MAGIC); if (!ctx)
return -ENOMEM;
ctx->ops = &pipefs_ops;
ctx->dops = &pipefs_dentry_operations;
return 0;
} }
static struct file_system_type pipe_fs_type = { static struct file_system_type pipe_fs_type = {
.name = "pipefs", .name = "pipefs",
.mount = pipefs_mount, .init_fs_context = pipefs_init_fs_context,
.kill_sb = kill_anon_super, .kill_sb = kill_anon_super,
}; };