99 lines
3.3 KiB
Diff
99 lines
3.3 KiB
Diff
Making an hfsplus partition bootable requires the ability to "bless" a
|
|
file by putting its inode number in the volume header. Doing this from
|
|
userspace on a mounted filesystem is impractical since the kernel will
|
|
write back the original values on unmount. Add an ioctl to allow userspace
|
|
to update the volume header information based on the target file.
|
|
|
|
Signed-off-by: Matthew Garrett <mjg@redhat.com>
|
|
---
|
|
Kept the ioctl in the hfs code, but moved it to a different range to reduce
|
|
reduce the chances of someone stepping on it with another filesystem.
|
|
Documentation/ioctl/ioctl-number.txt | 1 +
|
|
fs/hfsplus/hfsplus_fs.h | 5 +++++
|
|
fs/hfsplus/ioctl.c | 34 ++++++++++++++++++++++++++++++++++
|
|
3 files changed, 40 insertions(+), 0 deletions(-)
|
|
diff --git a/Documentation/ioctl/ioctl-number.txt b/Documentation/ioctl/ioctl-number.txt
|
|
index 4840334..37a4248 100644
|
|
--- a/Documentation/ioctl/ioctl-number.txt
|
|
+++ b/Documentation/ioctl/ioctl-number.txt
|
|
@@ -218,6 +218,7 @@ Code Seq#(hex) Include File Comments
|
|
'h' 00-7F conflict! Charon filesystem
|
|
<mailto:zapman@interlan.net>
|
|
'h' 00-1F linux/hpet.h conflict!
|
|
+'h' 80-8F fs/hfsplus/ioctl.c
|
|
'i' 00-3F linux/i2o-dev.h conflict!
|
|
'i' 0B-1F linux/ipmi.h conflict!
|
|
'i' 80-8F linux/i8k.h
|
|
diff --git a/fs/hfsplus/hfsplus_fs.h b/fs/hfsplus/hfsplus_fs.h
|
|
index 21a5b7f..4e75ac6 100644
|
|
--- a/fs/hfsplus/hfsplus_fs.h
|
|
+++ b/fs/hfsplus/hfsplus_fs.h
|
|
@@ -317,6 +317,11 @@ static inline unsigned short hfsplus_min_io_size(struct super_block *sb)
|
|
|
|
|
|
/*
|
|
+ * hfs+-specific ioctl for making the filesystem bootable
|
|
+ */
|
|
+#define HFSPLUS_IOC_BLESS _IO('h', 0x80)
|
|
+
|
|
+/*
|
|
* Functions in any *.c used in other files
|
|
*/
|
|
|
|
diff --git a/fs/hfsplus/ioctl.c b/fs/hfsplus/ioctl.c
|
|
index f66c765..c640ba5 100644
|
|
--- a/fs/hfsplus/ioctl.c
|
|
+++ b/fs/hfsplus/ioctl.c
|
|
@@ -20,6 +20,38 @@
|
|
#include <asm/uaccess.h>
|
|
#include "hfsplus_fs.h"
|
|
|
|
+/*
|
|
+ * "Blessing" an HFS+ filesystem writes metadata to the superblock informing
|
|
+ * the platform firmware which file to boot from
|
|
+ */
|
|
+static int hfsplus_ioctl_bless(struct file *file, int __user *user_flags)
|
|
+{
|
|
+ struct dentry *dentry = file->f_path.dentry;
|
|
+ struct inode *inode = dentry->d_inode;
|
|
+ struct hfsplus_sb_info *sbi = HFSPLUS_SB(inode->i_sb);
|
|
+ struct hfsplus_vh *vh = sbi->s_vhdr;
|
|
+ struct hfsplus_vh *bvh = sbi->s_backup_vhdr;
|
|
+
|
|
+ if (!capable(CAP_SYS_ADMIN))
|
|
+ return -EPERM;
|
|
+
|
|
+ mutex_lock(&sbi->vh_mutex);
|
|
+
|
|
+ /* Directory containing the bootable system */
|
|
+ vh->finder_info[0] = bvh->finder_info[0] =
|
|
+ cpu_to_be32(parent_ino(dentry));
|
|
+
|
|
+ /* Bootloader */
|
|
+ vh->finder_info[1] = bvh->finder_info[1] = cpu_to_be32(inode->i_ino);
|
|
+
|
|
+ /* Per spec, the OS X system folder - same as finder_info[0] here */
|
|
+ vh->finder_info[5] = bvh->finder_info[5] =
|
|
+ cpu_to_be32(parent_ino(dentry));
|
|
+
|
|
+ mutex_unlock(&sbi->vh_mutex);
|
|
+ return 0;
|
|
+}
|
|
+
|
|
static int hfsplus_ioctl_getflags(struct file *file, int __user *user_flags)
|
|
{
|
|
struct inode *inode = file->f_path.dentry->d_inode;
|
|
@@ -108,6 +140,8 @@ long hfsplus_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
|
|
return hfsplus_ioctl_getflags(file, argp);
|
|
case HFSPLUS_IOC_EXT2_SETFLAGS:
|
|
return hfsplus_ioctl_setflags(file, argp);
|
|
+ case HFSPLUS_IOC_BLESS:
|
|
+ return hfsplus_ioctl_bless(file, argp);
|
|
default:
|
|
return -ENOTTY;
|
|
}
|
|
--
|
|
1.7.7.6
|
|
|
|
|