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Revision 020ac5b6bef15785f9dde9de89d2734ff97da733 authored by Artem Bityutskiy on 31 May 2012, 23:26:12 UTC, committed by Linus Torvalds on 01 June 2012, 00:49:27 UTC 
fat: introduce special inode for managing the FSINFO block
 
This is patchset makes fatfs stop using the VFS '->write_super()' method
for writing out the FSINFO block.

The final goal is to get rid of the 'sync_supers()' kernel thread.  This
kernel thread wakes up every 5 seconds (by default) and calls
'->write_super()' for all mounted file-systems.  And the bad thing is that
this is done even if all the superblocks are clean.  Moreover, some
file-systems do not even need this end they do not register the
'->write_super()' method at all (e.g., btrfs).

So 'sync_supers()' most often just generates useless wake-ups and wastes
power.  I am trying to make all file-systems independent of
'->write_super()' and plan to remove 'sync_supers()' and '->write_super'
completely once there are no more users.

The '->write_supers()' method is mostly used by baroque file-systems like
hfs, udf, etc.  Modern file-systems like btrfs and xfs do not use it.
This justifies removing this stuff from VFS completely and make every FS
self-manage own superblock.

Tested with xfstests.

This patch:

Preparation for further changes.  It introduces a special inode
('fsinfo_inode') in FAT file-system which we'll later use for managing the
FSINFO block.  Note, this there is already one special inode ('fat_inode')
which is used for managing the FAT tables.

Introduce new 'MSDOS_FSINFO_INO' constant for this special inode.  It is
safe to do because FAT file-system does not store inode numbers on the
media but generates them run-time.

I've also cleaned up the comment to existing 'MSDOS_ROOT_INO' constant,
while on it.

Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Cc: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1 parent 7bc1bac
Raw File
Kconfig 
menuconfig SOUND
	tristate "Sound card support"
	depends on HAS_IOMEM
	help
	  If you have a sound card in your computer, i.e. if it can say more
	  than an occasional beep, say Y.  Be sure to have all the information
	  about your sound card and its configuration down (I/O port,
	  interrupt and DMA channel), because you will be asked for it.

	  You want to read the Sound-HOWTO, available from
	  <http://www.tldp.org/docs.html#howto>. General information about
	  the modular sound system is contained in the files
	  <file:Documentation/sound/oss/Introduction>.  The file
	  <file:Documentation/sound/oss/README.OSS> contains some slightly
	  outdated but still useful information as well.  Newer sound
	  driver documentation is found in <file:Documentation/sound/alsa/*>.

	  If you have a PnP sound card and you want to configure it at boot
	  time using the ISA PnP tools (read
	  <http://www.roestock.demon.co.uk/isapnptools/>), then you need to
	  compile the sound card support as a module and load that module
	  after the PnP configuration is finished.  To do this, choose M here
	  and read <file:Documentation/sound/oss/README.modules>; the module
	  will be called soundcore.

if SOUND

config SOUND_OSS_CORE
	bool
	default n

config SOUND_OSS_CORE_PRECLAIM
	bool "Preclaim OSS device numbers"
	depends on SOUND_OSS_CORE
	default y
	help
	  With this option enabled, the kernel will claim all OSS device
	  numbers if any OSS support (native or emulation) is enabled
	  whether the respective module is loaded or not and try to load the
	  appropriate module using sound-slot/service-* and char-major-*
	  module aliases when one of the device numbers is opened.  With
	  this option disabled, kernel will only claim actually in-use
	  device numbers and opening a missing device will generate only the
	  standard char-major-* aliases.

	  The only visible difference is use of additional module aliases
	  and whether OSS sound devices appear multiple times in
	  /proc/devices.  sound-slot/service-* module aliases are scheduled
	  to be removed (ie. PRECLAIM won't be available) and this option is
	  to make the transition easier.  This option can be overridden
	  during boot using the kernel parameter soundcore.preclaim_oss.

	  Disabling this allows alternative OSS implementations.

	  Please read Documentation/feature-removal-schedule.txt for
	  details.

	  If unsure, say Y.

source "sound/oss/dmasound/Kconfig"

if !M68K && !UML

menuconfig SND
	tristate "Advanced Linux Sound Architecture"
	help
	  Say 'Y' or 'M' to enable ALSA (Advanced Linux Sound Architecture),
	  the new base sound system.

	  For more information, see <http://www.alsa-project.org/>

if SND

source "sound/core/Kconfig"

source "sound/drivers/Kconfig"

source "sound/isa/Kconfig"

source "sound/pci/Kconfig"

source "sound/ppc/Kconfig"

source "sound/aoa/Kconfig"

source "sound/arm/Kconfig"

source "sound/atmel/Kconfig"

source "sound/spi/Kconfig"

source "sound/mips/Kconfig"

source "sound/sh/Kconfig"

# the following will depend on the order of config.
# here assuming USB is defined before ALSA
source "sound/usb/Kconfig"

source "sound/firewire/Kconfig"

# the following will depend on the order of config.
# here assuming PCMCIA is defined before ALSA
source "sound/pcmcia/Kconfig"

source "sound/sparc/Kconfig"

source "sound/parisc/Kconfig"

source "sound/soc/Kconfig"

endif # SND

menuconfig SOUND_PRIME
	tristate "Open Sound System (DEPRECATED)"
	select SOUND_OSS_CORE
	help
	  Say 'Y' or 'M' to enable Open Sound System drivers.

if SOUND_PRIME

source "sound/oss/Kconfig"

endif # SOUND_PRIME

endif # !M68K

endif # SOUND

# AC97_BUS is used from both sound and ucb1400
config AC97_BUS
	tristate
	help
	  This is used to avoid config and link hard dependencies between the
	  sound subsystem and other function drivers completely unrelated to
	  sound although they're sharing the AC97 bus. Concerned drivers
	  should "select" this.
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