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ext4: add DAX functionality

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This is a port of the DAX functionality found in the current version of
ext2.

[[email protected]: heavily tweaked]
[[email protected]: remap_pages went away]
Signed-off-by: Ross Zwisler <[email protected]>
Reviewed-by: Andreas Dilger <[email protected]>
Signed-off-by: Matthew Wilcox <[email protected]>
Cc: Boaz Harrosh <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Cc: Dave Chinner <[email protected]>
Cc: Jan Kara <[email protected]>
Cc: Jens Axboe <[email protected]>
Cc: Kirill A. Shutemov <[email protected]>
Cc: Mathieu Desnoyers <[email protected]>
Cc: Randy Dunlap <[email protected]>
Cc: Theodore Ts'o <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Ross Zwisler 2015-02-16 15:59:38 -08:00 • committed by Linus Torvalds
commit 923ae0ff92
8 changed files with 179 additions and 37 deletions
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1
Documentation/filesystems/dax.txt
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@ -73,6 +73,7 @@ or a write()) work correctly.
These filesystems may be used for inspiration:
- ext2: the second extended filesystem, see Documentation/filesystems/ext2.txt
- ext4: the fourth extended filesystem, see Documentation/filesystems/ext4.txt
Shortcomings

4
Documentation/filesystems/ext4.txt
View file

@ -386,6 +386,10 @@ max_dir_size_kb=n This limits the size of directories so that any
i_version Enable 64-bit inode version support. This option is
off by default.
dax Use direct access (no page cache). See
Documentation/filesystems/dax.txt. Note that
this option is incompatible with data=journal.
Data Mode
=========
There are 3 different data modes: