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block: enable by default support for large devices and files on 32-bit archs 

Enable by default support for large devices and files (CONFIG_LBD):

- With 1TB disks being a commodity hardware it is quite easy to hit 2TB
  limitation while building RAIDs etc. and many distros have been using
  CONFIG_LBD=y by default already (at least Fedora 10 and openSUSE 11.1).

- This should also prevent a subtle ext4 filesystem compatibility issue:
  mke2fs.ext4 defaults to creating filesystems with huge_files feature
  enabled and such filesystems cannot be later mounted read-write on
  machines with CONFIG_LBD=n (it should be quite easy to hit this issue
  when trying to use filesystem created using distro kernel on system
  running the self-build kernel, think about USB disk enclosures & co.).

While at it:

- Clarify config option help text w.r.t. mounting ext4 filesystems
  (they can be mounted with CONFIG_LBD=n but in the read-only mode).

Cc: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Bartlomiej Zolnierkiewicz 2009-04-21 09:27:03 +02:00 committed by Jens Axboe
parent 586cf2681f
commit db29a6b496
1 changed files with 7 additions and 4 deletions
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11
block/Kconfig
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@ -26,6 +26,7 @@ if BLOCK
config LBD config LBD
bool "Support for large block devices and files" bool "Support for large block devices and files"
depends on !64BIT depends on !64BIT
default y
help help
Enable block devices or files of size 2TB and larger. Enable block devices or files of size 2TB and larger.
@ -38,11 +39,13 @@ config LBD
The ext4 filesystem requires that this feature be enabled in The ext4 filesystem requires that this feature be enabled in
order to support filesystems that have the huge_file feature order to support filesystems that have the huge_file feature
enabled. Otherwise, it will refuse to mount any filesystems enabled. Otherwise, it will refuse to mount in the read-write
that use the huge_file feature, which is enabled by default mode any filesystems that use the huge_file feature, which is
by mke2fs.ext4. The GFS2 filesystem also requires this feature. enabled by default by mke2fs.ext4.
If unsure, say N. The GFS2 filesystem also requires this feature.
If unsure, say Y.
config BLK_DEV_BSG config BLK_DEV_BSG
bool "Block layer SG support v4 (EXPERIMENTAL)" bool "Block layer SG support v4 (EXPERIMENTAL)"