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| author | Matthew Wilcox <matthew.r.wilcox@intel.com> | 2015-02-16 15:59:35 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-02-16 17:56:04 -0800 |
| commit | 25726bc15731d42112b579cf73f30edbc43d3973 (patch) | |
| tree | aa8e2d0e7d0e6c92a581c88559b03027fb8f5589 /Documentation/filesystems | |
| parent | 9c3ce9ec58716733232b97771b10f31901caf62e (diff) | |
| download | blackbird-op-linux-25726bc15731d42112b579cf73f30edbc43d3973.tar.gz blackbird-op-linux-25726bc15731d42112b579cf73f30edbc43d3973.zip | |
dax: add dax_zero_page_range
This new function allows us to support hole-punch for DAX files by zeroing
a partial page, as opposed to the dax_truncate_page() function which can
only truncate to the end of the page. Reimplement dax_truncate_page() to
call dax_zero_page_range().
[ross.zwisler@linux.intel.com: ported to 3.13-rc2]
[akpm@linux-foundation.org: fix typos in comments]
Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
Signed-off-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Cc: Andreas Dilger <andreas.dilger@intel.com>
Cc: Boaz Harrosh <boaz@plexistor.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation/filesystems')
| -rw-r--r-- | Documentation/filesystems/dax.txt | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/Documentation/filesystems/dax.txt b/Documentation/filesystems/dax.txt index 635adaa1e425..ebcd97f03654 100644 --- a/Documentation/filesystems/dax.txt +++ b/Documentation/filesystems/dax.txt @@ -62,6 +62,7 @@ Filesystem support consists of for fault and page_mkwrite (which should probably call dax_fault() and dax_mkwrite(), passing the appropriate get_block() callback) - calling dax_truncate_page() instead of block_truncate_page() for DAX files +- calling dax_zero_page_range() instead of zero_user() for DAX files - ensuring that there is sufficient locking between reads, writes, truncates and page faults |
