Christoph Hellwig b53fdb215d iomap: improve shared block detection in iomap_unshare_iter ... Currently iomap_unshare_iter relies on the IOMAP_F_SHARED flag to detect blocks to unshare. This is reasonable, but IOMAP_F_SHARED is also useful for the file system to do internal book keeping for out of place writes. XFS used to that, until it got removed in commit 72a048c105 ("xfs: only set IOMAP_F_SHARED when providing a srcmap to a write") because unshare for incorrectly unshare such blocks. Add an extra safeguard by checking the explicitly provided srcmap instead of the fallback to the iomap for valid data, as that catches the case where we'd just copy from the same place we'd write to easily, allowing to reinstate setting IOMAP_F_SHARED for all XFS writes that go to the COW fork. Signed-off-by: Christoph Hellwig <hch@lst.de> Link: https://lore.kernel.org/r/20240910043949.3481298-3-hch@lst.de Reviewed-by: Darrick J. Wong <djwong@kernel.org> Signed-off-by: Christian Brauner <brauner@kernel.org>		2024-09-10 11:13:43 +02:00
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buffered-io.c	iomap: improve shared block detection in iomap_unshare_iter	2024-09-10 11:13:43 +02:00
direct-io.c	iomap: remove set_memor_ro() on zero page	2024-09-03 15:01:23 +02:00
fiemap.c	fs: Move many prototypes to pagemap.h	2022-03-21 12:59:02 -04:00
iter.c	iomap: write iomap validity checks	2022-11-29 09:09:17 +11:00
Makefile	kbuild: use $(src) instead of $(srctree)/$(src) for source directory	2024-05-10 04:34:52 +09:00
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: Add DIO tracepoints	2023-04-21 08:54:47 -07:00
trace.h	iomap: Add processed for iomap_iter	2024-02-21 08:37:50 +01:00