Andreas Gruenbacher 55d2254fd9 iomap: Fix inline extent handling in iomap_readpage ... commit d8af404ffce71448f29bbc19a05e3d095baf98eb upstream. Before commit 740499c784 ("iomap: fix the iomap_readpage_actor return value for inline data"), when hitting an IOMAP_INLINE extent, iomap_readpage_actor would report having read the entire page. Since then, it only reports having read the inline data (iomap->length). This will force iomap_readpage into another iteration, and the filesystem will report an unaligned hole after the IOMAP_INLINE extent. But iomap_readpage_actor (now iomap_readpage_iter) isn't prepared to deal with unaligned extents, it will get things wrong on filesystems with a block size smaller than the page size, and we'll eventually run into the following warning in iomap_iter_advance: WARN_ON_ONCE(iter->processed > iomap_length(iter)); Fix that by changing iomap_readpage_iter to return 0 when hitting an inline extent; this will cause iomap_iter to stop immediately. To fix readahead as well, change iomap_readahead_iter to pass on iomap_readpage_iter return values less than or equal to zero. Fixes: 740499c784 ("iomap: fix the iomap_readpage_actor return value for inline data") Cc: stable@vger.kernel.org # v5.15+ Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Darrick J. Wong <djwong@kernel.org> Signed-off-by: Darrick J. Wong <djwong@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2021-12-01 09:04:44 +01:00
..
Makefile	iomap: move loop control code to iter.c	2021-08-16 21:26:33 -07:00
buffered-io.c	iomap: Fix inline extent handling in iomap_readpage	2021-12-01 09:04:44 +01:00
direct-io.c	iomap: switch __iomap_dio_rw to use iomap_iter	2021-08-16 21:26:33 -07:00
fiemap.c	iomap: switch iomap_bmap to use iomap_iter	2021-08-16 21:26:33 -07:00
iter.c	iomap: move loop control code to iter.c	2021-08-16 21:26:33 -07:00
seek.c	iomap: switch iomap_seek_data to use iomap_iter	2021-08-16 21:26:33 -07:00
swapfile.c	mm/swap: consider max pages in iomap_swapfile_add_extent	2021-08-18 12:47:52 -07:00
trace.c	iomap: lift common tracing code from xfs to iomap	2019-10-21 08:51:59 -07:00
trace.h	iomap: standardize tracepoint formatting and storage	2021-08-26 09:18:53 -07:00