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Fiemap add physical length #10

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wants to merge 3 commits into from
Closed

Fiemap add physical length #10

wants to merge 3 commits into from

Commits on Mar 8, 2024

  1. fs: add physical_length field to fiemap extents 

    Some filesystems support compressed extents which have a larger logical
size than physical, and for those filesystems, it can be useful for
userspace to know how much space those extents actually use. For
instance, the compsize [1] tool for btrfs currently uses btrfs-internal,
root-only ioctl to find the actual disk space used by a file; it would
be better and more useful for this information to require fewer
privileges and to be usable on more filesystems. Therefore, use one of
the padding u64s in the fiemap extent structure to return the actual
physical length; and, for now, return this as equal to the logical
length.

[1] https://github.com/kilobyte/compsize

Signed-off-by: Sweet Tea Dorminy <[email protected]>
    @sweettea
    sweettea committed Mar 8, 2024
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  2. fs: update fiemap_fill_next_extent() signature 

    In order to allow filesystems to send both physical and logical length
for fiemap_extent population, update the signature of
fiemap_fill_next_extent() and update all callers to pass the same
logical and physical lengths.

Signed-off-by: Sweet Tea Dorminy <[email protected]>
    @sweettea
    sweettea committed Mar 8, 2024
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  3. btrfs: return extent disk size in fiemap 

    Now that fiemap allows returning extent disk size, plumb this through
btrfs.

Signed-off-by: Sweet Tea Dorminy <[email protected]>
    @sweettea
    sweettea committed Mar 8, 2024
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