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author | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-06-04 17:54:09 -0700 |
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committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-06-04 17:54:09 -0700 |
commit | ec4883b015c3212f6f6d04fb2ff45f528492f598 (patch) | |
tree | 0e393eb198a35a90adafcd8129564d0173aafad4 /drivers/mtd | |
parent | 464cf177df7727efcc5506322fc5d0c8b896f545 (diff) | |
parent | 0477d24e2a87a9077b62298b01b031929f5cf2a2 (diff) | |
download | linux-3.10-ec4883b015c3212f6f6d04fb2ff45f528492f598.tar.gz linux-3.10-ec4883b015c3212f6f6d04fb2ff45f528492f598.tar.bz2 linux-3.10-ec4883b015c3212f6f6d04fb2ff45f528492f598.zip |
Merge git://git.infradead.org/mtd-2.6
* git://git.infradead.org/mtd-2.6:
[JFFS2] Fix obsoletion of metadata nodes in jffs2_add_tn_to_tree()
[MTD] Fix error checking after get_mtd_device() in get_sb_mtd functions
[JFFS2] Fix buffer length calculations in jffs2_get_inode_nodes()
[JFFS2] Fix potential memory leak of dead xattrs on unmount.
[JFFS2] Fix BUG() caused by failing to discard xattrs on deleted files.
[MTD] generalise the handling of MTD-specific superblocks
[MTD] [MAPS] don't force uclinux mtd map to be root dev
Diffstat (limited to 'drivers/mtd')
-rw-r--r-- | drivers/mtd/Makefile | 3 | ||||
-rw-r--r-- | drivers/mtd/maps/uclinux.c | 5 | ||||
-rw-r--r-- | drivers/mtd/mtdsuper.c | 232 |
3 files changed, 233 insertions, 7 deletions
diff --git a/drivers/mtd/Makefile b/drivers/mtd/Makefile index 92055405cb3..451adcc52b3 100644 --- a/drivers/mtd/Makefile +++ b/drivers/mtd/Makefile @@ -1,10 +1,9 @@ # # Makefile for the memory technology device drivers. # -# $Id: Makefile.common,v 1.7 2005/07/11 10:39:27 gleixner Exp $ # Core functionality. -mtd-y := mtdcore.o +mtd-y := mtdcore.o mtdsuper.o mtd-$(CONFIG_MTD_PARTITIONS) += mtdpart.o obj-$(CONFIG_MTD) += $(mtd-y) diff --git a/drivers/mtd/maps/uclinux.c b/drivers/mtd/maps/uclinux.c index 389fea28b9a..14ffb1a9302 100644 --- a/drivers/mtd/maps/uclinux.c +++ b/drivers/mtd/maps/uclinux.c @@ -16,7 +16,6 @@ #include <linux/kernel.h> #include <linux/fs.h> #include <linux/major.h> -#include <linux/root_dev.h> #include <linux/mtd/mtd.h> #include <linux/mtd/map.h> #include <linux/mtd/partitions.h> @@ -89,10 +88,6 @@ int __init uclinux_mtd_init(void) uclinux_ram_mtdinfo = mtd; add_mtd_partitions(mtd, uclinux_romfs, NUM_PARTITIONS); - printk("uclinux[mtd]: set %s to be root filesystem\n", - uclinux_romfs[0].name); - ROOT_DEV = MKDEV(MTD_BLOCK_MAJOR, 0); - return(0); } diff --git a/drivers/mtd/mtdsuper.c b/drivers/mtd/mtdsuper.c new file mode 100644 index 00000000000..aca33197120 --- /dev/null +++ b/drivers/mtd/mtdsuper.c @@ -0,0 +1,232 @@ +/* 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); + + 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); |