925c86a19b
Add a new config option that controls building the buffer_head code, and select it from all file systems and stacking drivers that need it. For the block device nodes and alternative iomap based buffered I/O path is provided when buffer_head support is not enabled, and iomap needs a a small tweak to define the IOMAP_F_BUFFER_HEAD flag to 0 to not call into the buffer_head code when it doesn't exist. Otherwise this is just Kconfig and ifdef changes. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Luis Chamberlain <mcgrof@kernel.org> Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Link: https://lore.kernel.org/r/20230801172201.1923299-7-hch@lst.de Signed-off-by: Jens Axboe <axboe@kernel.dk>
4.0 KiB
SPDX-License-Identifier: GPL-2.0-only
Ext3 configs are here for backward compatibility with old configs which may
have EXT3_FS set but not EXT4_FS set and thus would result in non-bootable
kernels after the removal of ext3 driver.
config EXT3_FS tristate "The Extended 3 (ext3) filesystem" select EXT4_FS help This config option is here only for backward compatibility. ext3 filesystem is now handled by the ext4 driver.
config EXT3_FS_POSIX_ACL bool "Ext3 POSIX Access Control Lists" depends on EXT3_FS select EXT4_FS_POSIX_ACL select FS_POSIX_ACL help This config option is here only for backward compatibility. ext3 filesystem is now handled by the ext4 driver.
config EXT3_FS_SECURITY bool "Ext3 Security Labels" depends on EXT3_FS select EXT4_FS_SECURITY help This config option is here only for backward compatibility. ext3 filesystem is now handled by the ext4 driver.
config EXT4_FS tristate "The Extended 4 (ext4) filesystem" select BUFFER_HEAD select JBD2 select CRC16 select CRYPTO select CRYPTO_CRC32C select FS_IOMAP select FS_ENCRYPTION_ALGS if FS_ENCRYPTION help This is the next generation of the ext3 filesystem.
Unlike the change from ext2 filesystem to ext3 filesystem,
the on-disk format of ext4 is not forwards compatible with
ext3; it is based on extent maps and it supports 48-bit
physical block numbers. The ext4 filesystem also supports delayed
allocation, persistent preallocation, high resolution time stamps,
and a number of other features to improve performance and speed
up fsck time. For more information, please see the web pages at
http://ext4.wiki.kernel.org.
The ext4 filesystem supports mounting an ext3 filesystem; while there
are some performance gains from the delayed allocation and inode
table readahead, the best performance gains require enabling ext4
features in the filesystem using tune2fs, or formatting a new
filesystem as an ext4 filesystem initially. Without explicit enabling
of ext4 features, the on disk filesystem format stays fully backward
compatible.
To compile this file system support as a module, choose M here. The
module will be called ext4.
If unsure, say N.
config EXT4_USE_FOR_EXT2 bool "Use ext4 for ext2 file systems" depends on EXT4_FS depends on EXT2_FS=n default y help Allow the ext4 file system driver code to be used for ext2 file system mounts. This allows users to reduce their compiled kernel size by using one file system driver for ext2, ext3, and ext4 file systems.
config EXT4_FS_POSIX_ACL bool "Ext4 POSIX Access Control Lists" depends on EXT4_FS select FS_POSIX_ACL help POSIX Access Control Lists (ACLs) support permissions for users and groups beyond the owner/group/world scheme.
If you don't know what Access Control Lists are, say N
config EXT4_FS_SECURITY bool "Ext4 Security Labels" depends on EXT4_FS help Security labels support alternative access control models implemented by security modules like SELinux. This option enables an extended attribute handler for file security labels in the ext4 filesystem.
If you are not using a security module that requires using
extended attributes for file security labels, say N.
config EXT4_DEBUG bool "Ext4 debugging support" depends on EXT4_FS help Enables run-time debugging support for the ext4 filesystem.
If you select Y here, then you will be able to turn on debugging
using dynamic debug control for mb_debug() / ext_debug() msgs.
config EXT4_KUNIT_TESTS tristate "KUnit tests for ext4" if !KUNIT_ALL_TESTS depends on EXT4_FS && KUNIT default KUNIT_ALL_TESTS help This builds the ext4 KUnit tests.
KUnit tests run during boot and output the results to the debug log
in TAP format (https://testanything.org/). Only useful for kernel devs
running KUnit test harness and are not for inclusion into a production
build.
For more information on KUnit and unit tests in general please refer
to the KUnit documentation in Documentation/dev-tools/kunit/.
If unsure, say N.