mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-06 02:26:38 +07:00
48440e893d
Initialise s_flags in get_sb_mtd_aux() from the flags parameter. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
235 lines
5.6 KiB
C
235 lines
5.6 KiB
C
/* MTD-based superblock management
|
|
*
|
|
* Copyright © 2001-2007 Red Hat, Inc. All Rights Reserved.
|
|
* Written by: David Howells <dhowells@redhat.com>
|
|
* David Woodhouse <dwmw2@infradead.org>
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*/
|
|
|
|
#include <linux/mtd/super.h>
|
|
#include <linux/namei.h>
|
|
#include <linux/ctype.h>
|
|
|
|
/*
|
|
* compare superblocks to see if they're equivalent
|
|
* - they are if the underlying MTD device is the same
|
|
*/
|
|
static int get_sb_mtd_compare(struct super_block *sb, void *_mtd)
|
|
{
|
|
struct mtd_info *mtd = _mtd;
|
|
|
|
if (sb->s_mtd == mtd) {
|
|
DEBUG(2, "MTDSB: Match on device %d (\"%s\")\n",
|
|
mtd->index, mtd->name);
|
|
return 1;
|
|
}
|
|
|
|
DEBUG(2, "MTDSB: No match, device %d (\"%s\"), device %d (\"%s\")\n",
|
|
sb->s_mtd->index, sb->s_mtd->name, mtd->index, mtd->name);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* mark the superblock by the MTD device it is using
|
|
* - set the device number to be the correct MTD block device for pesuperstence
|
|
* of NFS exports
|
|
*/
|
|
static int get_sb_mtd_set(struct super_block *sb, void *_mtd)
|
|
{
|
|
struct mtd_info *mtd = _mtd;
|
|
|
|
sb->s_mtd = mtd;
|
|
sb->s_dev = MKDEV(MTD_BLOCK_MAJOR, mtd->index);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* get a superblock on an MTD-backed filesystem
|
|
*/
|
|
static int get_sb_mtd_aux(struct file_system_type *fs_type, int flags,
|
|
const char *dev_name, void *data,
|
|
struct mtd_info *mtd,
|
|
int (*fill_super)(struct super_block *, void *, int),
|
|
struct vfsmount *mnt)
|
|
{
|
|
struct super_block *sb;
|
|
int ret;
|
|
|
|
sb = sget(fs_type, get_sb_mtd_compare, get_sb_mtd_set, mtd);
|
|
if (IS_ERR(sb))
|
|
goto out_error;
|
|
|
|
if (sb->s_root)
|
|
goto already_mounted;
|
|
|
|
/* fresh new superblock */
|
|
DEBUG(1, "MTDSB: New superblock for device %d (\"%s\")\n",
|
|
mtd->index, mtd->name);
|
|
|
|
sb->s_flags = flags;
|
|
|
|
ret = fill_super(sb, data, flags & MS_SILENT ? 1 : 0);
|
|
if (ret < 0) {
|
|
up_write(&sb->s_umount);
|
|
deactivate_super(sb);
|
|
return ret;
|
|
}
|
|
|
|
/* go */
|
|
sb->s_flags |= MS_ACTIVE;
|
|
return simple_set_mnt(mnt, sb);
|
|
|
|
/* new mountpoint for an already mounted superblock */
|
|
already_mounted:
|
|
DEBUG(1, "MTDSB: Device %d (\"%s\") is already mounted\n",
|
|
mtd->index, mtd->name);
|
|
ret = simple_set_mnt(mnt, sb);
|
|
goto out_put;
|
|
|
|
out_error:
|
|
ret = PTR_ERR(sb);
|
|
out_put:
|
|
put_mtd_device(mtd);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* get a superblock on an MTD-backed filesystem by MTD device number
|
|
*/
|
|
static int get_sb_mtd_nr(struct file_system_type *fs_type, int flags,
|
|
const char *dev_name, void *data, int mtdnr,
|
|
int (*fill_super)(struct super_block *, void *, int),
|
|
struct vfsmount *mnt)
|
|
{
|
|
struct mtd_info *mtd;
|
|
|
|
mtd = get_mtd_device(NULL, mtdnr);
|
|
if (IS_ERR(mtd)) {
|
|
DEBUG(0, "MTDSB: Device #%u doesn't appear to exist\n", mtdnr);
|
|
return PTR_ERR(mtd);
|
|
}
|
|
|
|
return get_sb_mtd_aux(fs_type, flags, dev_name, data, mtd, fill_super,
|
|
mnt);
|
|
}
|
|
|
|
/*
|
|
* set up an MTD-based superblock
|
|
*/
|
|
int get_sb_mtd(struct file_system_type *fs_type, int flags,
|
|
const char *dev_name, void *data,
|
|
int (*fill_super)(struct super_block *, void *, int),
|
|
struct vfsmount *mnt)
|
|
{
|
|
struct nameidata nd;
|
|
int mtdnr, ret;
|
|
|
|
if (!dev_name)
|
|
return -EINVAL;
|
|
|
|
DEBUG(2, "MTDSB: dev_name \"%s\"\n", dev_name);
|
|
|
|
/* the preferred way of mounting in future; especially when
|
|
* CONFIG_BLOCK=n - we specify the underlying MTD device by number or
|
|
* by name, so that we don't require block device support to be present
|
|
* in the kernel. */
|
|
if (dev_name[0] == 'm' && dev_name[1] == 't' && dev_name[2] == 'd') {
|
|
if (dev_name[3] == ':') {
|
|
struct mtd_info *mtd;
|
|
|
|
/* mount by MTD device name */
|
|
DEBUG(1, "MTDSB: mtd:%%s, name \"%s\"\n",
|
|
dev_name + 4);
|
|
|
|
for (mtdnr = 0; mtdnr < MAX_MTD_DEVICES; mtdnr++) {
|
|
mtd = get_mtd_device(NULL, mtdnr);
|
|
if (!IS_ERR(mtd)) {
|
|
if (!strcmp(mtd->name, dev_name + 4))
|
|
return get_sb_mtd_aux(
|
|
fs_type, flags,
|
|
dev_name, data, mtd,
|
|
fill_super, mnt);
|
|
|
|
put_mtd_device(mtd);
|
|
}
|
|
}
|
|
|
|
printk(KERN_NOTICE "MTD:"
|
|
" MTD device with name \"%s\" not found.\n",
|
|
dev_name + 4);
|
|
|
|
} else if (isdigit(dev_name[3])) {
|
|
/* mount by MTD device number name */
|
|
char *endptr;
|
|
|
|
mtdnr = simple_strtoul(dev_name + 3, &endptr, 0);
|
|
if (!*endptr) {
|
|
/* It was a valid number */
|
|
DEBUG(1, "MTDSB: mtd%%d, mtdnr %d\n",
|
|
mtdnr);
|
|
return get_sb_mtd_nr(fs_type, flags,
|
|
dev_name, data,
|
|
mtdnr, fill_super, mnt);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* try the old way - the hack where we allowed users to mount
|
|
* /dev/mtdblock$(n) but didn't actually _use_ the blockdev
|
|
*/
|
|
ret = path_lookup(dev_name, LOOKUP_FOLLOW, &nd);
|
|
|
|
DEBUG(1, "MTDSB: path_lookup() returned %d, inode %p\n",
|
|
ret, nd.dentry ? nd.dentry->d_inode : NULL);
|
|
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = -EINVAL;
|
|
|
|
if (!S_ISBLK(nd.dentry->d_inode->i_mode))
|
|
goto out;
|
|
|
|
if (nd.mnt->mnt_flags & MNT_NODEV) {
|
|
ret = -EACCES;
|
|
goto out;
|
|
}
|
|
|
|
if (imajor(nd.dentry->d_inode) != MTD_BLOCK_MAJOR)
|
|
goto not_an_MTD_device;
|
|
|
|
mtdnr = iminor(nd.dentry->d_inode);
|
|
path_release(&nd);
|
|
|
|
return get_sb_mtd_nr(fs_type, flags, dev_name, data, mtdnr, fill_super,
|
|
mnt);
|
|
|
|
not_an_MTD_device:
|
|
if (!(flags & MS_SILENT))
|
|
printk(KERN_NOTICE
|
|
"MTD: Attempt to mount non-MTD device \"%s\"\n",
|
|
dev_name);
|
|
out:
|
|
path_release(&nd);
|
|
return ret;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(get_sb_mtd);
|
|
|
|
/*
|
|
* destroy an MTD-based superblock
|
|
*/
|
|
void kill_mtd_super(struct super_block *sb)
|
|
{
|
|
generic_shutdown_super(sb);
|
|
put_mtd_device(sb->s_mtd);
|
|
sb->s_mtd = NULL;
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(kill_mtd_super);
|