Btrfs: fix unexpected return value of fiemap

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btrfs's fiemap is supposed to return 0 on success and return < 0 on
error. however, ret becomes 1 after looking up the last file extent:

  btrfs_lookup_file_extent ->
    btrfs_search_slot(..., ins_len=0, cow=0)

and if the offset is beyond EOF, we'll get 'path' pointed to the place
of potentail insertion, and ret == 1.

This may confuse applications using ioctl(FIEL_IOC_FIEMAP).

Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>

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Liu Bo 2016-05-17 17:21:48 -07:00 • committed by David Sterba

parent 1c8b5b6e8b

commit 2d324f59f3

1 changed files with 5 additions and 1 deletions

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fs/btrfs/extent_io.c

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