forked from luck/tmp_suning_uos_patched
1751e8a6cb
This is a pure automated search-and-replace of the internal kernel
superblock flags.
The s_flags are now called SB_*, with the names and the values for the
moment mirroring the MS_* flags that they're equivalent to.
Note how the MS_xyz flags are the ones passed to the mount system call,
while the SB_xyz flags are what we then use in sb->s_flags.
The script to do this was:
# places to look in; re security/*: it generally should *not* be
# touched (that stuff parses mount(2) arguments directly), but
# there are two places where we really deal with superblock flags.
FILES="drivers/mtd drivers/staging/lustre fs ipc mm \
include/linux/fs.h include/uapi/linux/bfs_fs.h \
security/apparmor/apparmorfs.c security/apparmor/include/lib.h"
# the list of MS_... constants
SYMS="RDONLY NOSUID NODEV NOEXEC SYNCHRONOUS REMOUNT MANDLOCK \
DIRSYNC NOATIME NODIRATIME BIND MOVE REC VERBOSE SILENT \
POSIXACL UNBINDABLE PRIVATE SLAVE SHARED RELATIME KERNMOUNT \
I_VERSION STRICTATIME LAZYTIME SUBMOUNT NOREMOTELOCK NOSEC BORN \
ACTIVE NOUSER"
SED_PROG=
for i in $SYMS; do SED_PROG="$SED_PROG -e s/MS_$i/SB_$i/g"; done
# we want files that contain at least one of MS_...,
# with fs/namespace.c and fs/pnode.c excluded.
L=$(for i in $SYMS; do git grep -w -l MS_$i $FILES; done| sort|uniq|grep -v '^fs/namespace.c'|grep -v '^fs/pnode.c')
for f in $L; do sed -i $f $SED_PROG; done
Requested-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
225 lines
5.5 KiB
C
225 lines
5.5 KiB
C
/* MTD-based superblock management
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*
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* Copyright © 2001-2007 Red Hat, Inc. All Rights Reserved.
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* Copyright © 2001-2010 David Woodhouse <dwmw2@infradead.org>
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*
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* Written by: David Howells <dhowells@redhat.com>
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* David Woodhouse <dwmw2@infradead.org>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/mtd/super.h>
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#include <linux/namei.h>
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#include <linux/export.h>
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#include <linux/ctype.h>
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#include <linux/slab.h>
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#include <linux/major.h>
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#include <linux/backing-dev.h>
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/*
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* compare superblocks to see if they're equivalent
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* - they are if the underlying MTD device is the same
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*/
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static int get_sb_mtd_compare(struct super_block *sb, void *_mtd)
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{
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struct mtd_info *mtd = _mtd;
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if (sb->s_mtd == mtd) {
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pr_debug("MTDSB: Match on device %d (\"%s\")\n",
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mtd->index, mtd->name);
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return 1;
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}
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pr_debug("MTDSB: No match, device %d (\"%s\"), device %d (\"%s\")\n",
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sb->s_mtd->index, sb->s_mtd->name, mtd->index, mtd->name);
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return 0;
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}
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extern struct backing_dev_info *mtd_bdi;
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/*
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* mark the superblock by the MTD device it is using
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* - set the device number to be the correct MTD block device for pesuperstence
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* of NFS exports
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*/
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static int get_sb_mtd_set(struct super_block *sb, void *_mtd)
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{
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struct mtd_info *mtd = _mtd;
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sb->s_mtd = mtd;
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sb->s_dev = MKDEV(MTD_BLOCK_MAJOR, mtd->index);
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sb->s_bdi = bdi_get(mtd_bdi);
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return 0;
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}
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/*
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* get a superblock on an MTD-backed filesystem
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*/
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static struct dentry *mount_mtd_aux(struct file_system_type *fs_type, int flags,
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const char *dev_name, void *data,
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struct mtd_info *mtd,
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int (*fill_super)(struct super_block *, void *, int))
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{
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struct super_block *sb;
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int ret;
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sb = sget(fs_type, get_sb_mtd_compare, get_sb_mtd_set, flags, mtd);
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if (IS_ERR(sb))
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goto out_error;
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if (sb->s_root)
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goto already_mounted;
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/* fresh new superblock */
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pr_debug("MTDSB: New superblock for device %d (\"%s\")\n",
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mtd->index, mtd->name);
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ret = fill_super(sb, data, flags & SB_SILENT ? 1 : 0);
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if (ret < 0) {
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deactivate_locked_super(sb);
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return ERR_PTR(ret);
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}
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/* go */
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sb->s_flags |= SB_ACTIVE;
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return dget(sb->s_root);
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/* new mountpoint for an already mounted superblock */
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already_mounted:
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pr_debug("MTDSB: Device %d (\"%s\") is already mounted\n",
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mtd->index, mtd->name);
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put_mtd_device(mtd);
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return dget(sb->s_root);
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out_error:
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put_mtd_device(mtd);
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return ERR_CAST(sb);
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}
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/*
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* get a superblock on an MTD-backed filesystem by MTD device number
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*/
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static struct dentry *mount_mtd_nr(struct file_system_type *fs_type, int flags,
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const char *dev_name, void *data, int mtdnr,
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int (*fill_super)(struct super_block *, void *, int))
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{
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struct mtd_info *mtd;
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mtd = get_mtd_device(NULL, mtdnr);
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if (IS_ERR(mtd)) {
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pr_debug("MTDSB: Device #%u doesn't appear to exist\n", mtdnr);
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return ERR_CAST(mtd);
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}
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return mount_mtd_aux(fs_type, flags, dev_name, data, mtd, fill_super);
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}
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/*
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* set up an MTD-based superblock
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*/
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struct dentry *mount_mtd(struct file_system_type *fs_type, int flags,
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const char *dev_name, void *data,
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int (*fill_super)(struct super_block *, void *, int))
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{
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#ifdef CONFIG_BLOCK
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struct block_device *bdev;
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int ret, major;
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#endif
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int mtdnr;
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if (!dev_name)
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return ERR_PTR(-EINVAL);
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pr_debug("MTDSB: dev_name \"%s\"\n", dev_name);
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/* the preferred way of mounting in future; especially when
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* CONFIG_BLOCK=n - we specify the underlying MTD device by number or
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* by name, so that we don't require block device support to be present
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* in the kernel. */
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if (dev_name[0] == 'm' && dev_name[1] == 't' && dev_name[2] == 'd') {
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if (dev_name[3] == ':') {
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struct mtd_info *mtd;
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/* mount by MTD device name */
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pr_debug("MTDSB: mtd:%%s, name \"%s\"\n",
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dev_name + 4);
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mtd = get_mtd_device_nm(dev_name + 4);
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if (!IS_ERR(mtd))
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return mount_mtd_aux(
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fs_type, flags,
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dev_name, data, mtd,
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fill_super);
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printk(KERN_NOTICE "MTD:"
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" MTD device with name \"%s\" not found.\n",
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dev_name + 4);
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} else if (isdigit(dev_name[3])) {
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/* mount by MTD device number name */
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char *endptr;
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mtdnr = simple_strtoul(dev_name + 3, &endptr, 0);
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if (!*endptr) {
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/* It was a valid number */
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pr_debug("MTDSB: mtd%%d, mtdnr %d\n",
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mtdnr);
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return mount_mtd_nr(fs_type, flags,
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dev_name, data,
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mtdnr, fill_super);
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}
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}
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}
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#ifdef CONFIG_BLOCK
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/* try the old way - the hack where we allowed users to mount
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* /dev/mtdblock$(n) but didn't actually _use_ the blockdev
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*/
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bdev = lookup_bdev(dev_name);
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if (IS_ERR(bdev)) {
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ret = PTR_ERR(bdev);
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pr_debug("MTDSB: lookup_bdev() returned %d\n", ret);
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return ERR_PTR(ret);
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}
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pr_debug("MTDSB: lookup_bdev() returned 0\n");
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ret = -EINVAL;
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major = MAJOR(bdev->bd_dev);
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mtdnr = MINOR(bdev->bd_dev);
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bdput(bdev);
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if (major != MTD_BLOCK_MAJOR)
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goto not_an_MTD_device;
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return mount_mtd_nr(fs_type, flags, dev_name, data, mtdnr, fill_super);
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not_an_MTD_device:
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#endif /* CONFIG_BLOCK */
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if (!(flags & SB_SILENT))
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printk(KERN_NOTICE
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"MTD: Attempt to mount non-MTD device \"%s\"\n",
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dev_name);
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return ERR_PTR(-EINVAL);
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}
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EXPORT_SYMBOL_GPL(mount_mtd);
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/*
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* destroy an MTD-based superblock
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*/
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void kill_mtd_super(struct super_block *sb)
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{
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generic_shutdown_super(sb);
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put_mtd_device(sb->s_mtd);
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sb->s_mtd = NULL;
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}
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EXPORT_SYMBOL_GPL(kill_mtd_super);
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