linux.git/include/linux/iomap.h, branch v5.15-rc2

iomap: constify iomap_iter_srcmap

2021-08-17T04:26:33+00:00

The srcmap returned from iomap_iter_srcmap is never modified, so mark
the iomap returned from it const and constify a lot of code that never
modifies the iomap.

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

iomap: rework unshare flag

2021-08-17T04:26:33+00:00

Instead of another internal flags namespace inside of buffered-io.c,
just pass a UNSHARE hint in the main iomap flags field.

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

iomap: remove iomap_apply

2021-08-17T04:26:33+00:00

iomap_apply is unused now, so remove it.

Signed-off-by: Christoph Hellwig 
[djwong: rebase this patch to preserve git history of iomap loop control]
Reviewed-by: Darrick J. Wong 
Signed-off-by: Darrick J. Wong 
Reviewed-by: Dave Chinner

iomap: switch __iomap_dio_rw to use iomap_iter

2021-08-17T04:26:33+00:00

Switch __iomap_dio_rw to use iomap_iter.

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

iomap: add the new iomap_iter model

2021-08-17T04:26:33+00:00

The iomap_iter struct provides a convenient way to package up and
maintain all the arguments to the various mapping and operation
functions.  It is operated on using the iomap_iter() function that
is called in loop until the whole range has been processed.  Compared
to the existing iomap_apply() function this avoid an indirect call
for each iteration.

For now iomap_iter() calls back into the existing ->iomap_begin and
->iomap_end methods, but in the future this could be further optimized
to avoid indirect calls entirely.

Based on an earlier patch from Matthew Wilcox .

Signed-off-by: Christoph Hellwig 
[djwong: add to apply.c to preserve git history of iomap loop control]
Reviewed-by: Darrick J. Wong 
Signed-off-by: Darrick J. Wong 
Reviewed-by: Dave Chinner

iomap: mark the iomap argument to iomap_inline_data_valid const

2021-08-17T04:26:33+00:00

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

iomap: mark the iomap argument to iomap_inline_data const

2021-08-17T04:26:33+00:00

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

iomap: mark the iomap argument to iomap_sector const

2021-08-17T04:26:33+00:00

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

iomap: remove the iomap arguments to ->page_{prepare,done}

2021-08-17T04:26:33+00:00

These aren't actually used by the only instance implementing the methods.

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

iomap: support reading inline data from non-zero pos

2021-08-03T16:43:13+00:00

The existing inline data support only works for cases where the entire
file is stored as inline data.  For larger files, EROFS stores the
initial blocks separately and the remainder of the file ("file tail")
adjacent to the inode.  Generalise inline data to allow reading the
inline file tail.  Tails may not cross a page boundary in memory.

We currently have no filesystems that support tails and writing,
so that case is currently disabled (see iomap_write_begin_inline).

Reviewed-by: Darrick J. Wong 
Reviewed-by: Christoph Hellwig 
Reviewed-by: Matthew Wilcox (Oracle) 
Signed-off-by: Andreas Gruenbacher 
Signed-off-by: Gao Xiang 
Signed-off-by: Darrick J. Wong