diff options
author | David Howells <dhowells@redhat.com> | 2019-03-25 17:38:23 +0100 |
---|---|---|
committer | Al Viro <viro@zeniv.linux.org.uk> | 2019-05-26 00:00:04 +0200 |
commit | 31d6d5ce53400d6dc58e29ddd8dc184b3ba89d66 (patch) | |
tree | 3d2a12d63794b5ab86295001c711d63591e71ffa | |
parent | vfs: Provide sb->s_iflags settings in fs_context struct (diff) | |
download | linux-31d6d5ce53400d6dc58e29ddd8dc184b3ba89d66.tar.xz linux-31d6d5ce53400d6dc58e29ddd8dc184b3ba89d66.zip |
vfs: Provide a mount_pseudo-replacement for the new mount API
Provide a function, init_pseudo(), that provides a common
infrastructure for converting pseudo-filesystems that can never be
mountable.
[AV: once all users of mount_pseudo_xattr() get converted, it will be folded
into pseudo_fs_get_tree()]
Signed-off-by: David Howells <dhowells@redhat.com>
cc: linux-fsdevel@vger.kernel.org
-rw-r--r-- | fs/libfs.c | 46 | ||||
-rw-r--r-- | include/linux/pseudo_fs.h | 16 |
2 files changed, 62 insertions, 0 deletions
diff --git a/fs/libfs.c b/fs/libfs.c index 030e545f586e..edef70d35438 100644 --- a/fs/libfs.c +++ b/fs/libfs.c @@ -16,6 +16,8 @@ #include <linux/exportfs.h> #include <linux/writeback.h> #include <linux/buffer_head.h> /* sync_mapping_buffers */ +#include <linux/fs_context.h> +#include <linux/pseudo_fs.h> #include <linux/uaccess.h> @@ -235,6 +237,50 @@ static const struct super_operations simple_super_operations = { .statfs = simple_statfs, }; +static int pseudo_fs_get_tree(struct fs_context *fc) +{ + struct pseudo_fs_context *ctx = fc->fs_private; + struct dentry *root; + + root = mount_pseudo_xattr(fc->fs_type, + ctx->ops, ctx->xattr, + ctx->dops, ctx->magic); + if (IS_ERR(root)) + return PTR_ERR(root); + + fc->root = root; + return 0; +} + +static void pseudo_fs_free(struct fs_context *fc) +{ + kfree(fc->fs_private); +} + +static const struct fs_context_operations pseudo_fs_context_ops = { + .free = pseudo_fs_free, + .get_tree = pseudo_fs_get_tree, +}; + +/* + * Common helper for pseudo-filesystems (sockfs, pipefs, bdev - stuff that + * will never be mountable) + */ +struct pseudo_fs_context *init_pseudo(struct fs_context *fc, + unsigned long magic) +{ + struct pseudo_fs_context *ctx; + + ctx = kzalloc(sizeof(struct pseudo_fs_context), GFP_KERNEL); + if (likely(ctx)) { + ctx->magic = magic; + fc->fs_private = ctx; + fc->ops = &pseudo_fs_context_ops; + } + return ctx; +} +EXPORT_SYMBOL(init_pseudo); + /* * Common helper for pseudo-filesystems (sockfs, pipefs, bdev - stuff that * will never be mountable) diff --git a/include/linux/pseudo_fs.h b/include/linux/pseudo_fs.h new file mode 100644 index 000000000000..eceda1d1407a --- /dev/null +++ b/include/linux/pseudo_fs.h @@ -0,0 +1,16 @@ +#ifndef __LINUX_PSEUDO_FS__ +#define __LINUX_PSEUDO_FS__ + +#include <linux/fs_context.h> + +struct pseudo_fs_context { + const struct super_operations *ops; + const struct xattr_handler **xattr; + const struct dentry_operations *dops; + unsigned long magic; +}; + +struct pseudo_fs_context *init_pseudo(struct fs_context *fc, + unsigned long magic); + +#endif |