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hfsplus: add an ioctl to bless files

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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>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Matthew Garrett 2012-02-06 15:14:40 -05:00 • committed by Al Viro
parent 0347b6e95c
commit a051f71ce9
3 changed files with 40 additions and 0 deletions
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Documentation/ioctl/ioctl-number.txt
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@ -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