linux-stable.git/include/linux/iomap.h, branch v4.10.2

iomap: implement direct I/O

2016-11-30T03:36:01+00:00

This adds a full fledget direct I/O implementation using the iomap
interface. Full fledged in this case means all features are supported:
AIO, vectored I/O, any iov_iter type including kernel pointers, bvecs
and pipes, support for hole filling and async apending writes.  It does
not mean supporting all the warts of the old generic code.  We expect
i_rwsem to be held over the duration of the call, and we expect to
maintain i_dio_count ourselves, and we pass on any kinds of mapping
to the file system for now.

The algorithm used is very simple: We use iomap_apply to iterate over
the range of the I/O, and then we use the new bio_iov_iter_get_pages
helper to lock down the user range for the size of the extent.
bio_iov_iter_get_pages can currently lock down twice as many pages as
the old direct I/O code did, which means that we will have a better
batch factor for everything but overwrites of badly fragmented files.

Signed-off-by: Christoph Hellwig 
Reviewed-by: Kent Overstreet 
Tested-by: Jens Axboe 
Reviewed-by: Darrick J. Wong 
Signed-off-by: Dave Chinner

Merge branch 'xfs-4.10-misc-fixes-2' into iomap-4.10-directio

2016-11-30T01:49:38+00:00

dax: Introduce IOMAP_FAULT flag

2016-11-09T23:26:50+00:00

Introduce a flag telling iomap operations whether they are handling a
fault or other IO. That may influence behavior wrt inode size and
similar things.

Signed-off-by: Jan Kara 
Reviewed-by: Dave Chinner 
Reviewed-by: Christoph Hellwig 
Signed-off-by: Dave Chinner

iomap: add IOMAP_REPORT

2016-10-20T04:51:28+00:00

This allows the file system to tell a FIEMAP from a read operation, and thus
avoids the need to report flags that aren't actually used in the read path.

Signed-off-by: Christoph Hellwig 
Reviewed-by: Darrick J. Wong 
Reviewed-by: Brian Foster 
Signed-off-by: Dave Chinner

Merge branch 'iomap-4.9-dax' into for-next

2016-10-02T22:53:59+00:00

iomap: add IOMAP_F_NEW flag

2016-09-19T01:24:37+00:00

Signed-off-by: Christoph Hellwig 
Reviewed-by: Ross Zwisler 
Signed-off-by: Dave Chinner

iomap: add a flag to report shared extents

2016-09-19T00:13:02+00:00

Signed-off-by: Darrick J. Wong 
Reviewed-by: Christoph Hellwig 
Signed-off-by: Dave Chinner

fs: add iomap_file_dirty

2016-09-19T00:12:45+00:00

Originally-From: Christoph Hellwig 

This function uses the iomap infrastructure to re-write all pages
in a given range.  This is useful for doing a copy-up of COW ranges,
and might be useful for scrubbing in the future.

Signed-off-by: Christoph Hellwig 
Reviewed-by: Dave Chinner 
Signed-off-by: Dave Chinner

iomap: don't set FIEMAP_EXTENT_MERGED for extent based filesystems

2016-08-29T01:33:58+00:00

Filesystems like XFS that use extents should not set the
FIEMAP_EXTENT_MERGED flag in the fiemap extent structures.  To allow
for both behaviors for the upcoming gfs2 usage split the iomap
type field into type and flags, and only set FIEMAP_EXTENT_MERGED if
the IOMAP_F_MERGED flag is set.  The flags field will also come in
handy for future features such as shared extents on reflink-enabled
file systems.

Reported-by: Andreas Gruenbacher 
Signed-off-by: Christoph Hellwig 
Acked-by: Darrick J. Wong 
Signed-off-by: Dave Chinner

fs: iomap based fiemap implementation

2016-06-20T23:38:45+00:00

Add a simple fiemap implementation based on iomap_ops, partially based
on a previous implementation from Bob Peterson .

Signed-off-by: Christoph Hellwig 
Reviewed-by: Dave Chinner 
Signed-off-by: Dave Chinner