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common/filter: add _filter_xfs_io_fiemap()

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Add _filter_xfs_io_fiemap() to clean up the output of
'xfs_io -c fiemap'.  This will be used by a function in common/verity.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Reviewed-by: Eryu Guan <guaneryu@gmail.com>
Signed-off-by: Eryu Guan <guaneryu@gmail.com>
This commit is contained in:
Eric Biggers
2019-09-30 14:15:46 -07:00
committed by Eryu Guan
parent ac92390251
commit 12629d54e2
1 changed files with 24 additions and 0 deletions
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@@ -541,6 +541,30 @@ _filter_filefrag()
$flags, "\n"'
}
# Clean up the extents list output of 'xfs_io -c fiemap', e.g.
#
# file:
# 0: [0..79]: 628365312..628365391
# 1: [80..159]: hole
# 2: [160..319]: 628365472..628365631
# =>
# 0 79 628365312 628365391
# 160 319 628365472 628365631
#
# The fields are:
#
# first_logical_block last_logical_block first_physical_block last_physical_block
#
# Blocks are 512 bytes, and holes are omitted.
#
_filter_xfs_io_fiemap()
{
grep -E '^[[:space:]]+[0-9]+:' \
| grep -v '\<hole\>' \
| sed -E 's/^[[:space:]]+[0-9]+://' \
| tr '][.:' ' '
}
# We generate WARNINGs on purpose when applications mix buffered/mmap IO with
# direct IO on the same file. This is a helper for _check_dmesg() to filter out
# such warnings.