On Thu, Aug 19, 2021 at 02:05:52PM +0800, Qu Wenruo wrote:

On 2021/8/19 下午2:03, Qu Wenruo wrote:

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On 2021/8/18 上午8:38, Sidong Yang wrote:

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On Tue, Aug 17, 2021 at 03:30:22PM +0200, David Sterba wrote:

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On Sun, Jul 18, 2021 at 06:46:01AM +0000, Sidong Yang wrote:

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This patch adds an subcommand in inspect-internal. It dumps file
extents of
the file that user provided. It helps to show the internal information
about file extents comprise the file.

Do you have an example of the output? That's the most interesting part.
Thanks.

Thanks for reply.
This is an example of the output below.

# ./btrfs inspect-internal dump-file-extent /mnt/test1
type = regular, start = 2097152, len = 3227648, disk_bytenr = 0,
disk_num_bytes = 0, offset = 0, compression = none
type = regular, start = 5324800, len = 16728064, disk_bytenr = 0,
disk_num_bytes = 0, offset = 0, compression = none
type = regular, start = 22052864, len = 8486912, disk_bytenr = 0,
disk_num_bytes = 0, offset = 0, compression = none
type = regular, start = 30572544, len = 36540416, disk_bytenr = 0,
disk_num_bytes = 0, offset = 0, compression = none
type = regular, start = 67112960, len = 5299630080, disk_bytenr = 0,
disk_num_bytes = 0, offset = 0, compression = none

Could you give an example which includes both real (non-hole) extents
and real extents (better to include regular, compressed, preallocated
and inline).

Tons of typos... I mean to include both holes (like the existing
example) and non-holes extents...

Sorry, I had no idea about holes. But I found some test code in
xfstests. It helpes me to make hole in file.

xfs_io -c "fpunch 96K 32K" /mnt/a/foobar
xfs_io -c "fpunch 64K 128K" /mnt/a/foobar

and the example is below.

# ./btrfs inspect dump-file-extent /mnt/a/foobar 
type = regular, start = 0, len = 98304, disk_bytenr = 21651456,
disk_num_bytes = 4096, offset = 0, compression = zstd
type = regular, start = 98304, len = 32768, disk_bytenr = 0,
disk_num_bytes = 0, offset = 0, compression = none

I'm afaid that I understand your request correctly. Is it what you want?

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Currently the output only contains holes, and for holes, a lot of
members makes no sense, like disk_bytenr/disk_num_bytes/offset (even it
can be non-zero) and compression.

Thanks,
Qu

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Thanks,
Sidong