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This makes the defautl ext3 data ordering mode (when no explicit ordering is set) configurable, so as to allow people to default to 'data=writeback' and get the resulting latency improvements. This is a non-issue if a filesystem has been explicitly set to some ordering (with 'tune2fs'). Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
87 lines
3.2 KiB
Plaintext
87 lines
3.2 KiB
Plaintext
config EXT3_FS
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tristate "Ext3 journalling file system support"
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select JBD
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help
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This is the journalling version of the Second extended file system
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(often called ext3), the de facto standard Linux file system
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(method to organize files on a storage device) for hard disks.
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The journalling code included in this driver means you do not have
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to run e2fsck (file system checker) on your file systems after a
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crash. The journal keeps track of any changes that were being made
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at the time the system crashed, and can ensure that your file system
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is consistent without the need for a lengthy check.
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Other than adding the journal to the file system, the on-disk format
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of ext3 is identical to ext2. It is possible to freely switch
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between using the ext3 driver and the ext2 driver, as long as the
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file system has been cleanly unmounted, or e2fsck is run on the file
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system.
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To add a journal on an existing ext2 file system or change the
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behavior of ext3 file systems, you can use the tune2fs utility ("man
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tune2fs"). To modify attributes of files and directories on ext3
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file systems, use chattr ("man chattr"). You need to be using
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e2fsprogs version 1.20 or later in order to create ext3 journals
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(available at <http://sourceforge.net/projects/e2fsprogs/>).
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To compile this file system support as a module, choose M here: the
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module will be called ext3.
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config EXT3_DEFAULTS_TO_ORDERED
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bool "Default to 'data=ordered' in ext3 (legacy option)"
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depends on EXT3_FS
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help
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If a filesystem does not explicitly specify a data ordering
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mode, and the journal capability allowed it, ext3 used to
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historically default to 'data=ordered'.
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That was a rather unfortunate choice, because it leads to all
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kinds of latency problems, and the 'data=writeback' mode is more
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appropriate these days.
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You should probably always answer 'n' here, and if you really
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want to use 'data=ordered' mode, set it in the filesystem itself
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with 'tune2fs -o journal_data_ordered'.
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But if you really want to enable the legacy default, you can do
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so by answering 'y' to this question.
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config EXT3_FS_XATTR
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bool "Ext3 extended attributes"
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depends on EXT3_FS
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default y
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help
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Extended attributes are name:value pairs associated with inodes by
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the kernel or by users (see the attr(5) manual page, or visit
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<http://acl.bestbits.at/> for details).
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If unsure, say N.
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You need this for POSIX ACL support on ext3.
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config EXT3_FS_POSIX_ACL
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bool "Ext3 POSIX Access Control Lists"
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depends on EXT3_FS_XATTR
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select FS_POSIX_ACL
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help
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Posix Access Control Lists (ACLs) support permissions for users and
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groups beyond the owner/group/world scheme.
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To learn more about Access Control Lists, visit the Posix ACLs for
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Linux website <http://acl.bestbits.at/>.
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If you don't know what Access Control Lists are, say N
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config EXT3_FS_SECURITY
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bool "Ext3 Security Labels"
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depends on EXT3_FS_XATTR
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help
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Security labels support alternative access control models
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implemented by security modules like SELinux. This option
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enables an extended attribute handler for file security
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labels in the ext3 filesystem.
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If you are not using a security module that requires using
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extended attributes for file security labels, say N.
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