kernel/linux.git/include/linux/iomap.h, branch v5.15.209

iomap: Add done_before argument to iomap_dio_rw

2022-05-01T15:22:32+00:00

commit 4fdccaa0d184c202f98d73b24e3ec8eeee88ab8d upstream Add a done_before argument to iomap_dio_rw that indicates how much of the request has already been transferred. When the request succeeds, we report that done_before additional bytes were tranferred. This is useful for finishing a request asynchronously when part of the request has already been completed synchronously. We'll use that to allow iomap_dio_rw to be used with page faults disabled: when a page fault occurs while submitting a request, we synchronously complete the part of the request that has already been submitted. The caller can then take care of the page fault and call iomap_dio_rw again for the rest of the request, passing in the number of bytes already tranferred. Signed-off-by: Andreas Gruenbacher Reviewed-by: Darrick J. Wong Signed-off-by: Anand Jain Signed-off-by: Greg Kroah-Hartman

iomap: Support partial direct I/O on user copy failures

2022-05-01T15:22:31+00:00

commit 97308f8b0d867e9ef59528cd97f0db55ffdf5651 upstream In iomap_dio_rw, when iomap_apply returns an -EFAULT error and the IOMAP_DIO_PARTIAL flag is set, complete the request synchronously and return a partial result. This allows the caller to deal with the page fault and retry the remainder of the request. Signed-off-by: Andreas Gruenbacher Reviewed-by: Darrick J. Wong Signed-off-by: Anand Jain Signed-off-by: Greg Kroah-Hartman

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