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[PATCH] switch mtd and dm-table to lookup_bdev()

Browse source 
No need to open-code it...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2008-08-01 05:00:11 -04:00
parent a95164d979
commit d5686b444f
3 changed files with 18 additions and 45 deletions
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29
drivers/md/dm-table.c
View file

@ -316,29 +316,12 @@ static inline int check_space(struct dm_table *t)
*/
static int lookup_device(const char *path, dev_t *dev)
{
int r;
struct nameidata nd;
struct inode *inode;
if ((r = path_lookup(path, LOOKUP_FOLLOW, &nd)))
return r;
inode = nd.path.dentry->d_inode;
if (!inode) {
r = -ENOENT;
goto out;
}
if (!S_ISBLK(inode->i_mode)) {
r = -ENOTBLK;
goto out;
}
*dev = inode->i_rdev;
out:
path_put(&nd.path);
return r;
struct block_device *bdev = lookup_bdev(path);
if (IS_ERR(bdev))
return PTR_ERR(bdev);
*dev = bdev->bd_dev;
bdput(bdev);
return 0;
}
/*

33
drivers/mtd/mtdsuper.c
View file

@ -125,7 +125,7 @@ int get_sb_mtd(struct file_system_type *fs_type, int flags,
int (*fill_super)(struct super_block *, void *, int),
struct vfsmount *mnt)
{
struct nameidata nd;
struct block_device *bdev;
int mtdnr, ret;
if (!dev_name)
@ -181,29 +181,20 @@ int get_sb_mtd(struct file_system_type *fs_type, int flags,
/* 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.path.dentry ? nd.path.dentry->d_inode : NULL);
if (ret)
bdev = lookup_bdev(dev_name);
if (IS_ERR(bdev)) {
ret = PTR_ERR(bdev);
DEBUG(1, "MTDSB: lookup_bdev() returned %d\n", ret);
return ret;
}
DEBUG(1, "MTDSB: lookup_bdev() returned 0\n");
ret = -EINVAL;
if (!S_ISBLK(nd.path.dentry->d_inode->i_mode))
goto out;
if (nd.path.mnt->mnt_flags & MNT_NODEV) {
ret = -EACCES;
goto out;
}
if (imajor(nd.path.dentry->d_inode) != MTD_BLOCK_MAJOR)
if (MAJOR(bdev->bd_dev) != MTD_BLOCK_MAJOR)
goto not_an_MTD_device;
mtdnr = iminor(nd.path.dentry->d_inode);
path_put(&nd.path);
mtdnr = MINOR(bdev->bd_dev);
bdput(bdev);
return get_sb_mtd_nr(fs_type, flags, dev_name, data, mtdnr, fill_super,
mnt);
@ -213,10 +204,8 @@ not_an_MTD_device:
printk(KERN_NOTICE
"MTD: Attempt to mount non-MTD device \"%s\"\n",
dev_name);
out:
path_put(&nd.path);
bdput(bdev);
return ret;
}
EXPORT_SYMBOL_GPL(get_sb_mtd);

1
fs/block_dev.c
View file

@ -1236,6 +1236,7 @@ fail:
bdev = ERR_PTR(error);
goto out;
}
EXPORT_SYMBOL(lookup_bdev);
/**
* open_bdev_excl - open a block device by name and set it up for use