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SubjectRe: [f2fs-dev] [PATCH v3] f2fs: change fiemap way in printing compression chunk
On Fri, Jul 23, 2021 at 12:49:28AM -0700, Daeho Jeong wrote:
> From: Daeho Jeong <daehojeong@google.com>
>
> When we print out a discontinuous compression chunk, it shows like a
> continuous chunk now. To show it more correctly, I've changed the way of
> printing fiemap info like below. Plus, eliminated NEW_ADDR(-1) in fiemap
> info, since it is not in fiemap user api manual.
>
> Let's assume 16KB compression cluster.
>
> <before>
> Logical Physical Length Flags
> 0: 0000000000000000 00000002c091f000 0000000000004000 1008
> 1: 0000000000004000 00000002c0920000 0000000000004000 1008
> ...
> 9: 0000000000034000 0000000f8c623000 0000000000004000 1008
> 10: 0000000000038000 000000101a6eb000 0000000000004000 1008
>
> <after>
> 0: 0000000000000000 00000002c091f000 0000000000004000 1008
> 1: 0000000000004000 00000002c0920000 0000000000004000 1008
> ...
> 9: 0000000000034000 0000000f8c623000 0000000000001000 1008
> 10: 0000000000035000 000000101a6ea000 0000000000003000 1008
> 11: 0000000000038000 000000101a6eb000 0000000000002000 1008
> 12: 000000000003a000 00000002c3544000 0000000000002000 1008
>
> Flags
> 0x1000 => FIEMAP_EXTENT_MERGED
> 0x0008 => FIEMAP_EXTENT_ENCODED
>
> Signed-off-by: Daeho Jeong <daehojeong@google.com>
>
> ---
> v3: fix the missing last extent flag issue
> v2: changed the print format
> ---
> fs/f2fs/data.c | 75 ++++++++++++++++++++++++++++----------------------
> 1 file changed, 42 insertions(+), 33 deletions(-)

I can't understand the code in f2fs_fiemap(), but I tested that my two
compression+encryption tests (xfstest f2fs/002 and Android
vts_kernel_encryption_test) pass reliably when this patch is applied.

Tested-by: Eric Biggers <ebiggers@google.com>

- Eric

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