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authorDavid Howells <dhowells@redhat.com>2019-03-25 16:38:31 +0000
committerAl Viro <viro@zeniv.linux.org.uk>2019-09-12 21:05:34 -0400
commitf32356261d44d580649a7abce1156d15d49cf20f (patch)
tree140effa4ef1e1ff107ec8028d7c55862191264e6 /fs/ramfs
parent626c3920aeb4575f53c96b0d4ad4e651a21cbb66 (diff)
vfs: Convert ramfs, shmem, tmpfs, devtmpfs, rootfs to use the new mount API
Convert the ramfs, shmem, tmpfs, devtmpfs and rootfs filesystems 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. Note that tmpfs is slightly tricky as it can contain embedded commas, so it can't be trivially split up using strsep() to break on commas in generic_parse_monolithic(). Instead, tmpfs has to supply its own generic parser. However, if tmpfs changes, then devtmpfs and rootfs, which are wrappers around tmpfs or ramfs, must change too - and thus so must ramfs, so these had to be converted also. [AV: rewritten] Signed-off-by: David Howells <dhowells@redhat.com> cc: Hugh Dickins <hughd@google.com> cc: linux-mm@kvack.org Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/ramfs')
-rw-r--r--fs/ramfs/inode.c99
1 files changed, 58 insertions, 41 deletions
diff --git a/fs/ramfs/inode.c b/fs/ramfs/inode.c
index b85d1e77e934..d82636e8eb65 100644
--- a/fs/ramfs/inode.c
+++ b/fs/ramfs/inode.c
@@ -36,6 +36,8 @@
#include <linux/magic.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
+#include <linux/fs_context.h>
+#include <linux/fs_parser.h>
#include "internal.h"
struct ramfs_mount_opts {
@@ -175,62 +177,52 @@ static const struct super_operations ramfs_ops = {
.show_options = ramfs_show_options,
};
-enum {
+enum ramfs_param {
Opt_mode,
- Opt_err
};
-static const match_table_t tokens = {
- {Opt_mode, "mode=%o"},
- {Opt_err, NULL}
+static const struct fs_parameter_spec ramfs_param_specs[] = {
+ fsparam_u32oct("mode", Opt_mode),
+ {}
};
-static int ramfs_parse_options(char *data, struct ramfs_mount_opts *opts)
+const struct fs_parameter_description ramfs_fs_parameters = {
+ .name = "ramfs",
+ .specs = ramfs_param_specs,
+};
+
+static int ramfs_parse_param(struct fs_context *fc, struct fs_parameter *param)
{
- substring_t args[MAX_OPT_ARGS];
- int option;
- int token;
- char *p;
-
- opts->mode = RAMFS_DEFAULT_MODE;
-
- while ((p = strsep(&data, ",")) != NULL) {
- if (!*p)
- continue;
-
- token = match_token(p, tokens, args);
- switch (token) {
- case Opt_mode:
- if (match_octal(&args[0], &option))
- return -EINVAL;
- opts->mode = option & S_IALLUGO;
- break;
+ struct fs_parse_result result;
+ struct ramfs_fs_info *fsi = fc->s_fs_info;
+ int opt;
+
+ opt = fs_parse(fc, &ramfs_fs_parameters, param, &result);
+ if (opt < 0) {
/*
* We might like to report bad mount options here;
* but traditionally ramfs has ignored all mount options,
* and as it is used as a !CONFIG_SHMEM simple substitute
* for tmpfs, better continue to ignore other mount options.
*/
- }
+ if (opt == -ENOPARAM)
+ opt = 0;
+ return opt;
+ }
+
+ switch (opt) {
+ case Opt_mode:
+ fsi->mount_opts.mode = result.uint_32 & S_IALLUGO;
+ break;
}
return 0;
}
-static int ramfs_fill_super(struct super_block *sb, void *data, int silent)
+static int ramfs_fill_super(struct super_block *sb, struct fs_context *fc)
{
- struct ramfs_fs_info *fsi;
+ struct ramfs_fs_info *fsi = sb->s_fs_info;
struct inode *inode;
- int err;
-
- fsi = kzalloc(sizeof(struct ramfs_fs_info), GFP_KERNEL);
- sb->s_fs_info = fsi;
- if (!fsi)
- return -ENOMEM;
-
- err = ramfs_parse_options(data, &fsi->mount_opts);
- if (err)
- return err;
sb->s_maxbytes = MAX_LFS_FILESIZE;
sb->s_blocksize = PAGE_SIZE;
@@ -247,10 +239,34 @@ static int ramfs_fill_super(struct super_block *sb, void *data, int silent)
return 0;
}
-struct dentry *ramfs_mount(struct file_system_type *fs_type,
- int flags, const char *dev_name, void *data)
+static int ramfs_get_tree(struct fs_context *fc)
{
- return mount_nodev(fs_type, flags, data, ramfs_fill_super);
+ return get_tree_nodev(fc, ramfs_fill_super);
+}
+
+static void ramfs_free_fc(struct fs_context *fc)
+{
+ kfree(fc->s_fs_info);
+}
+
+static const struct fs_context_operations ramfs_context_ops = {
+ .free = ramfs_free_fc,
+ .parse_param = ramfs_parse_param,
+ .get_tree = ramfs_get_tree,
+};
+
+int ramfs_init_fs_context(struct fs_context *fc)
+{
+ struct ramfs_fs_info *fsi;
+
+ fsi = kzalloc(sizeof(*fsi), GFP_KERNEL);
+ if (!fsi)
+ return -ENOMEM;
+
+ fsi->mount_opts.mode = RAMFS_DEFAULT_MODE;
+ fc->s_fs_info = fsi;
+ fc->ops = &ramfs_context_ops;
+ return 0;
}
static void ramfs_kill_sb(struct super_block *sb)
@@ -261,7 +277,8 @@ static void ramfs_kill_sb(struct super_block *sb)
static struct file_system_type ramfs_fs_type = {
.name = "ramfs",
- .mount = ramfs_mount,
+ .init_fs_context = ramfs_init_fs_context,
+ .parameters = &ramfs_fs_parameters,
.kill_sb = ramfs_kill_sb,
.fs_flags = FS_USERNS_MOUNT,
};