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4efc0c7 |
Making an hfsplus partition bootable requires the ability to "bless" a
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file by putting its inode number in the volume header. Doing this from
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userspace on a mounted filesystem is impractical since the kernel will
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4efc0c7 |
write back the original values on unmount. Add an ioctl to allow userspace
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to update the volume header information based on the target file.
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Signed-off-by: Matthew Garrett <mjg@redhat.com>
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4efc0c7 |
---
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4efc0c7 |
Kept the ioctl in the hfs code, but moved it to a different range to reduce
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reduce the chances of someone stepping on it with another filesystem.
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Documentation/ioctl/ioctl-number.txt | 1 +
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4efc0c7 |
fs/hfsplus/hfsplus_fs.h | 5 +++++
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fs/hfsplus/ioctl.c | 34 ++++++++++++++++++++++++++++++++++
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3 files changed, 40 insertions(+), 0 deletions(-)
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diff --git a/Documentation/ioctl/ioctl-number.txt b/Documentation/ioctl/ioctl-number.txt
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index 4840334..37a4248 100644
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--- a/Documentation/ioctl/ioctl-number.txt
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+++ b/Documentation/ioctl/ioctl-number.txt
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@@ -218,6 +218,7 @@ Code Seq#(hex) Include File Comments
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'h' 00-7F conflict! Charon filesystem
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<mailto:zapman@interlan.net>
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'h' 00-1F linux/hpet.h conflict!
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+'h' 80-8F fs/hfsplus/ioctl.c
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'i' 00-3F linux/i2o-dev.h conflict!
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'i' 0B-1F linux/ipmi.h conflict!
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'i' 80-8F linux/i8k.h
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diff --git a/fs/hfsplus/hfsplus_fs.h b/fs/hfsplus/hfsplus_fs.h
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index 21a5b7f..4e75ac6 100644
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--- a/fs/hfsplus/hfsplus_fs.h
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+++ b/fs/hfsplus/hfsplus_fs.h
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@@ -317,6 +317,11 @@ static inline unsigned short hfsplus_min_io_size(struct super_block *sb)
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4efc0c7 |
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/*
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+ * hfs+-specific ioctl for making the filesystem bootable
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+ */
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+#define HFSPLUS_IOC_BLESS _IO('h', 0x80)
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+
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+/*
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* Functions in any *.c used in other files
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*/
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diff --git a/fs/hfsplus/ioctl.c b/fs/hfsplus/ioctl.c
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index f66c765..c640ba5 100644
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--- a/fs/hfsplus/ioctl.c
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+++ b/fs/hfsplus/ioctl.c
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@@ -20,6 +20,38 @@
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#include <asm/uaccess.h>
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#include "hfsplus_fs.h"
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+/*
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+ * "Blessing" an HFS+ filesystem writes metadata to the superblock informing
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+ * the platform firmware which file to boot from
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+ */
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+static int hfsplus_ioctl_bless(struct file *file, int __user *user_flags)
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+{
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+ struct dentry *dentry = file->f_path.dentry;
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+ struct inode *inode = dentry->d_inode;
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+ struct hfsplus_sb_info *sbi = HFSPLUS_SB(inode->i_sb);
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+ struct hfsplus_vh *vh = sbi->s_vhdr;
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+ struct hfsplus_vh *bvh = sbi->s_backup_vhdr;
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+
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+ if (!capable(CAP_SYS_ADMIN))
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+ return -EPERM;
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+
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+ mutex_lock(&sbi->vh_mutex);
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+
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+ /* Directory containing the bootable system */
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+ vh->finder_info[0] = bvh->finder_info[0] =
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+ cpu_to_be32(parent_ino(dentry));
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+
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+ /* Bootloader */
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+ vh->finder_info[1] = bvh->finder_info[1] = cpu_to_be32(inode->i_ino);
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+
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+ /* Per spec, the OS X system folder - same as finder_info[0] here */
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+ vh->finder_info[5] = bvh->finder_info[5] =
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+ cpu_to_be32(parent_ino(dentry));
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+
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+ mutex_unlock(&sbi->vh_mutex);
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+ return 0;
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+}
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+
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static int hfsplus_ioctl_getflags(struct file *file, int __user *user_flags)
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{
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struct inode *inode = file->f_path.dentry->d_inode;
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@@ -108,6 +140,8 @@ long hfsplus_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
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return hfsplus_ioctl_getflags(file, argp);
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case HFSPLUS_IOC_EXT2_SETFLAGS:
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return hfsplus_ioctl_setflags(file, argp);
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+ case HFSPLUS_IOC_BLESS:
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+ return hfsplus_ioctl_bless(file, argp);
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default:
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return -ENOTTY;
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}
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4efc0c7 |
--
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1.7.7.6
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