kevin/linux
1
Fork 0
Code

Convert coda to use the new mount API

Browse Source 
Convert the coda 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.rst for more information.

Note this is slightly tricky as coda currently only has a binary mount data
interface.  This is handled through the parse_monolithic hook.

Also add a more conventional interface with a parameter named "fd" that
takes an fd that refers to a coda psdev, thereby specifying the index to
use.

Signed-off-by: David Howells <dhowells@redhat.com>
Co-developed-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: Eric Sandeen <sandeen@redhat.com>
[sandeen: forward port to current upstream mount API interfaces]
Link: https://lore.kernel.org/r/97650eeb-94c7-4041-b58c-90e81e76b699@redhat.com
Tested-by: Jan Harkes <jaharkes@cs.cmu.edu>
Reviewed-by: Ian Kent <raven@themaw.net>
cc: coda@cs.cmu.edu
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
David Howells 2024-02-21 09:40:03 -06:00 committed by Christian Brauner
parent 0611a640e6
commit 5916f439f2
1 changed files with 101 additions and 48 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

149
fs/coda/inode.c
View File

@ -24,6 +24,8 @@
#include <linux/pid_namespace.h>
#include <linux/uaccess.h>
#include <linux/fs.h>
#include <linux/fs_context.h>
#include <linux/fs_parser.h>
#include <linux/vmalloc.h>
#include <linux/coda.h>
@ -87,10 +89,10 @@ void coda_destroy_inodecache(void)
kmem_cache_destroy(coda_inode_cachep);
}
static int coda_remount(struct super_block *sb, int *flags, char *data)
static int coda_reconfigure(struct fs_context *fc)
{
sync_filesystem(sb);
*flags |= SB_NOATIME;
sync_filesystem(fc->root->d_sb);
fc->sb_flags |= SB_NOATIME;
return 0;
}
@ -102,78 +104,102 @@ static const struct super_operations coda_super_operations =
.evict_inode = coda_evict_inode,
.put_super = coda_put_super,
.statfs = coda_statfs,
.remount_fs = coda_remount,
};
static int get_device_index(struct coda_mount_data *data)
struct coda_fs_context {
int idx;
};
enum {
Opt_fd,
};
static const struct fs_parameter_spec coda_param_specs[] = {
fsparam_fd ("fd", Opt_fd),
{}
};
static int coda_parse_fd(struct fs_context *fc, int fd)
{
struct coda_fs_context *ctx = fc->fs_private;
struct fd f;
struct inode *inode;
int idx;
if (data == NULL) {
pr_warn("%s: Bad mount data\n", __func__);
return -1;
}
if (data->version != CODA_MOUNT_VERSION) {
pr_warn("%s: Bad mount version\n", __func__);
return -1;
}
f = fdget(data->fd);
f = fdget(fd);
if (!f.file)
goto Ebadf;
return -EBADF;
inode = file_inode(f.file);
if (!S_ISCHR(inode->i_mode) || imajor(inode) != CODA_PSDEV_MAJOR) {
fdput(f);
goto Ebadf;
return invalf(fc, "code: Not coda psdev");
}
idx = iminor(inode);
fdput(f);
if (idx < 0 || idx >= MAX_CODADEVS) {
pr_warn("%s: Bad minor number\n", __func__);
return -1;
if (idx < 0 || idx >= MAX_CODADEVS)
return invalf(fc, "coda: Bad minor number");
ctx->idx = idx;
return 0;
}
return idx;
Ebadf:
pr_warn("%s: Bad file\n", __func__);
return -1;
}
static int coda_fill_super(struct super_block *sb, void *data, int silent)
static int coda_parse_param(struct fs_context *fc, struct fs_parameter *param)
{
struct fs_parse_result result;
int opt;
opt = fs_parse(fc, coda_param_specs, param, &result);
if (opt < 0)
return opt;
switch (opt) {
case Opt_fd:
return coda_parse_fd(fc, result.uint_32);
}
return 0;
}
/*
* Parse coda's binary mount data form. We ignore any errors and go with index
* 0 if we get one for backward compatibility.
*/
static int coda_parse_monolithic(struct fs_context *fc, void *_data)
{
struct coda_mount_data *data = _data;
if (!data)
return invalf(fc, "coda: Bad mount data");
if (data->version != CODA_MOUNT_VERSION)
return invalf(fc, "coda: Bad mount version");
coda_parse_fd(fc, data->fd);
return 0;
}
static int coda_fill_super(struct super_block *sb, struct fs_context *fc)
{
struct coda_fs_context *ctx = fc->fs_private;
struct inode *root = NULL;
struct venus_comm *vc;
struct CodaFid fid;
int error;
int idx;
if (task_active_pid_ns(current) != &init_pid_ns)
return -EINVAL;
infof(fc, "coda: device index: %i\n", ctx->idx);
idx = get_device_index((struct coda_mount_data *) data);
/* Ignore errors in data, for backward compatibility */
if(idx == -1)
idx = 0;
pr_info("%s: device index: %i\n", __func__, idx);
vc = &coda_comms[idx];
vc = &coda_comms[ctx->idx];
mutex_lock(&vc->vc_mutex);
if (!vc->vc_inuse) {
pr_warn("%s: No pseudo device\n", __func__);
errorf(fc, "coda: No pseudo device");
error = -EINVAL;
goto unlock_out;
}
if (vc->vc_sb) {
pr_warn("%s: Device already mounted\n", __func__);
errorf(fc, "coda: Device already mounted");
error = -EBUSY;
goto unlock_out;
}
@ -313,18 +339,45 @@ static int coda_statfs(struct dentry *dentry, struct kstatfs *buf)
return 0;
}
/* init_coda: used by filesystems.c to register coda */
static struct dentry *coda_mount(struct file_system_type *fs_type,
int flags, const char *dev_name, void *data)
static int coda_get_tree(struct fs_context *fc)
{
return mount_nodev(fs_type, flags, data, coda_fill_super);
if (task_active_pid_ns(current) != &init_pid_ns)
return -EINVAL;
return get_tree_nodev(fc, coda_fill_super);
}
static void coda_free_fc(struct fs_context *fc)
{
kfree(fc->fs_private);
}
static const struct fs_context_operations coda_context_ops = {
.free = coda_free_fc,
.parse_param = coda_parse_param,
.parse_monolithic = coda_parse_monolithic,
.get_tree = coda_get_tree,
.reconfigure = coda_reconfigure,
};
static int coda_init_fs_context(struct fs_context *fc)
{
struct coda_fs_context *ctx;
ctx = kzalloc(sizeof(struct coda_fs_context), GFP_KERNEL);
if (!ctx)
return -ENOMEM;
fc->fs_private = ctx;
fc->ops = &coda_context_ops;
return 0;
}
struct file_system_type coda_fs_type = {
.owner = THIS_MODULE,
.name = "coda",
.mount = coda_mount,
.init_fs_context = coda_init_fs_context,
.parameters = coda_param_specs,
.kill_sb = kill_anon_super,
.fs_flags = FS_BINARY_MOUNTDATA,
};