Release 4.12 drivers/mtd/mtdsuper.c
/* MTD-based superblock management
*
* Copyright © 2001-2007 Red Hat, Inc. All Rights Reserved.
* Copyright © 2001-2010 David Woodhouse <dwmw2@infradead.org>
*
* 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/export.h>
#include <linux/ctype.h>
#include <linux/slab.h>
#include <linux/major.h>
#include <linux/backing-dev.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) {
pr_debug("MTDSB: Match on device %d (\"%s\")\n",
mtd->index, mtd->name);
return 1;
}
pr_debug("MTDSB: No match, device %d (\"%s\"), device %d (\"%s\")\n",
sb->s_mtd->index, sb->s_mtd->name, mtd->index, mtd->name);
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| David Howells | 74 | 97.37% | 1 | 50.00% |
| Brian Norris | 2 | 2.63% | 1 | 50.00% |
| Total | 76 | 100.00% | 2 | 100.00% |
extern struct backing_dev_info *mtd_bdi;
/*
* 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);
sb->s_bdi = bdi_get(mtd_bdi);
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| David Howells | 44 | 83.02% | 1 | 33.33% |
| Jan Kara | 5 | 9.43% | 1 | 33.33% |
| Jörn Engel | 4 | 7.55% | 1 | 33.33% |
| Total | 53 | 100.00% | 3 | 100.00% |
/*
* get a superblock on an MTD-backed filesystem
*/
static struct dentry *mount_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 super_block *sb;
int ret;
sb = sget(fs_type, get_sb_mtd_compare, get_sb_mtd_set, flags, mtd);
if (IS_ERR(sb))
goto out_error;
if (sb->s_root)
goto already_mounted;
/* fresh new superblock */
pr_debug("MTDSB: New superblock for device %d (\"%s\")\n",
mtd->index, mtd->name);
ret = fill_super(sb, data, flags & MS_SILENT ? 1 : 0);
if (ret < 0) {
deactivate_locked_super(sb);
return ERR_PTR(ret);
}
/* go */
sb->s_flags |= MS_ACTIVE;
return dget(sb->s_root);
/* new mountpoint for an already mounted superblock */
already_mounted:
pr_debug("MTDSB: Device %d (\"%s\") is already mounted\n",
mtd->index, mtd->name);
put_mtd_device(mtd);
return dget(sb->s_root);
out_error:
put_mtd_device(mtd);
return ERR_CAST(sb);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| David Howells | 169 | 86.67% | 2 | 40.00% |
| Al Viro | 24 | 12.31% | 2 | 40.00% |
| Brian Norris | 2 | 1.03% | 1 | 20.00% |
| Total | 195 | 100.00% | 5 | 100.00% |
/*
* get a superblock on an MTD-backed filesystem by MTD device number
*/
static struct dentry *mount_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 mtd_info *mtd;
mtd = get_mtd_device(NULL, mtdnr);
if (IS_ERR(mtd)) {
pr_debug("MTDSB: Device #%u doesn't appear to exist\n", mtdnr);
return ERR_CAST(mtd);
}
return mount_mtd_aux(fs_type, flags, dev_name, data, mtd, fill_super);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| David Howells | 83 | 86.46% | 1 | 25.00% |
| Al Viro | 6 | 6.25% | 1 | 25.00% |
| David Woodhouse | 6 | 6.25% | 1 | 25.00% |
| Brian Norris | 1 | 1.04% | 1 | 25.00% |
| Total | 96 | 100.00% | 4 | 100.00% |
/*
* set up an MTD-based superblock
*/
struct dentry *mount_mtd(struct file_system_type *fs_type, int flags,
const char *dev_name, void *data,
int (*fill_super)(struct super_block *, void *, int))
{
#ifdef CONFIG_BLOCK
struct block_device *bdev;
int ret, major;
#endif
int mtdnr;
if (!dev_name)
return ERR_PTR(-EINVAL);
pr_debug("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 */
pr_debug("MTDSB: mtd:%%s, name \"%s\"\n",
dev_name + 4);
mtd = get_mtd_device_nm(dev_name + 4);
if (!IS_ERR(mtd))
return mount_mtd_aux(
fs_type, flags,
dev_name, data, mtd,
fill_super);
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 */
pr_debug("MTDSB: mtd%%d, mtdnr %d\n",
mtdnr);
return mount_mtd_nr(fs_type, flags,
dev_name, data,
mtdnr, fill_super);
}
}
}
#ifdef CONFIG_BLOCK
/* try the old way - the hack where we allowed users to mount
* /dev/mtdblock$(n) but didn't actually _use_ the blockdev
*/
bdev = lookup_bdev(dev_name);
if (IS_ERR(bdev)) {
ret = PTR_ERR(bdev);
pr_debug("MTDSB: lookup_bdev() returned %d\n", ret);
return ERR_PTR(ret);
}
pr_debug("MTDSB: lookup_bdev() returned 0\n");
ret = -EINVAL;
major = MAJOR(bdev->bd_dev);
mtdnr = MINOR(bdev->bd_dev);
bdput(bdev);
if (major != MTD_BLOCK_MAJOR)
goto not_an_MTD_device;
return mount_mtd_nr(fs_type, flags, dev_name, data, mtdnr, fill_super);
not_an_MTD_device:
#endif /* CONFIG_BLOCK */
if (!(flags & MS_SILENT))
printk(KERN_NOTICE
"MTD: Attempt to mount non-MTD device \"%s\"\n",
dev_name);
return ERR_PTR(-EINVAL);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| David Howells | 272 | 74.73% | 1 | 14.29% |
| Al Viro | 49 | 13.46% | 2 | 28.57% |
| David Woodhouse | 34 | 9.34% | 2 | 28.57% |
| Brian Norris | 5 | 1.37% | 1 | 14.29% |
| Ben Hutchings | 4 | 1.10% | 1 | 14.29% |
| Total | 364 | 100.00% | 7 | 100.00% |
EXPORT_SYMBOL_GPL(mount_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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| David Howells | 28 | 100.00% | 1 | 100.00% |
| Total | 28 | 100.00% | 1 | 100.00% |
EXPORT_SYMBOL_GPL(kill_mtd_super);
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| David Howells | 694 | 81.07% | 2 | 14.29% |
| Al Viro | 80 | 9.35% | 3 | 21.43% |
| David Woodhouse | 41 | 4.79% | 3 | 21.43% |
| Jan Kara | 14 | 1.64% | 1 | 7.14% |
| Brian Norris | 10 | 1.17% | 1 | 7.14% |
| Jörn Engel | 7 | 0.82% | 1 | 7.14% |
| Ben Hutchings | 4 | 0.47% | 1 | 7.14% |
| Ezequiel García | 3 | 0.35% | 1 | 7.14% |
| Paul Gortmaker | 3 | 0.35% | 1 | 7.14% |
| Total | 856 | 100.00% | 14 | 100.00% |
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