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Revert all this. It can cause device-mapper to receive a different major from
earlier kernels and it turns out that the Amanda backup program (via GNU tar,
apparently) checks major numbers on files when performing incremental backups.
Which is a bit broken of Amanda (or tar), but this feature isn't important
enough to justify the churn.
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Several people have reported failures in dynamic major device number handling
due to the recent changes in there to avoid handing out the local/experimental
majors.
Rolf reports that this is due to a gcc-4.1.0 bug.
The patch refactors that code a lot in an attempt to provoke the compiler into
behaving.
Cc: Rolf Eike Beer <eike-kernel@sf-tec.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Starting the conversion:
* internal dev_t made 32bit.
* new helpers - new_encode_dev(), new_decode_dev(), huge_encode_dev(),
huge_decode_dev(), new_valid_dev(). They do encoding/decoding of 32bit and
64bit values; for now huge_... are aliases for new_... and new_valid_dev()
is always true. We do 12:20 for 32bit; representation is compatible with
16bit one - we have major in bits 19--8 and minor in 31--20,7--0. That's
what the userland sees; internally we have (major << 20)|minor, of course.
* MKDEV(), MAJOR() and MINOR() updated.
* several places used to handle Missed'em'V dev_t (14:18 split)
manually; that stuff had been taken into common helpers.
Now we can start replacing old_... with new_... and huge_..., depending
on the width available. MKDEV() callers should (for now) make sure that major
and minor are within 12:20. That's what the next chunk will do.
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kdev_t, to_kdev_t(), etc. are gone - there is no more objects
of that type and no remaining callers of these functions.
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tty redirect handling sanitized. Such ttys (/dev/tty and
/dev/console) get a different file_operations; its ->write() handles
redirects; checks for file->f_op == &tty_fops updated, checks for
major:minor being that of a redirector replaced with check for
->f_op->write value. Piece of code in tty_io.c that had been #if 0
since 0.99<something> had been finally put out of its misery. kdev_val()
is gone.
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removed unused kdev_t stuff, fixed a typo left from the
console->device() conversion.
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From: Greg KH <greg@kroah.com>
Different architectures use different types for dev_t, so it is hard to
print dev_t variables out correctly. Quite a lot of code is wrong now, and
will continue to be wrong when 64-bit dev_t is merged.
Greg's patch introduces a little wrapper function which can be used to
safely form a dev_t for printing. I added the format_dev_t function as
well, which is needed for direct insertion in a printk statement.
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fbdev.node converted from kdev_t to int - all of its users
have register_framebuffer() which sets .node to mk_kdev(FB_MAJOR, index)
already called and all of them start with applying minor(). IOW, what
they actually want is framebuffer number.
* type of ->node changed to int
* register_framebuffer() sets it to index instead of mk_kdev(...)
* users converted from minor(foo.node) to foo.node
* useless assignments (typically to NODEV) removed - we never
look at that field before register_framebuffer() overwrites it and thus
any assignments prior to register_framebuffer() call are dead code.
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RIP. It's not used anymore, so we kill assignments to it and the
field itself. That was the last serious use of kdev_t in block drivers.
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Now that the devicemapper hit the tree there's no more reason
to keep the uncompiling LVM1 code around and it's various hacks
to other files around, this patch removes it.
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* ->i_dev followed the example of ->s_dev - it's dev_t now. All
remaining uses of ->i_dev either outright want dev_t (stat()) or couldn't
care less (printing major:minor in /proc/<pid>/maps, etc.)
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->s_dev is switched to dev_t. Everything that uses it uses it as
a number - i.e. all instances are either minor() or kdev_t_to_nr().
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- Davide Libenzi: nicer timeslices for scheduler
- Arnaldo: wd7000 scsi driver cleanups and bio update
- Greg KH: USB update (including initial 2.0 support)
- me: strict typechecking on "kdev_t"
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- sync up more with Alan
- Urban Widmark: smbfs and HIGHMEM fix
- Chris Mason: reiserfs tail unpacking fix ("null bytes in reiserfs files")
- Adan Richter: new cpia usb ID
- Hugh Dickins: misc small sysv ipc fixes
- Andries Brouwer: remove overly restrictive sector size check for
SCSI cd-roms
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