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List:       linux-ext4
Subject:    [PATCH v4 1/8] common/filter: add _filter_xfs_io_fiemap()
From:       Eric Biggers <ebiggers () kernel ! org>
Date:       2019-09-30 21:15:46
Message-ID: 20190930211553.64208-2-ebiggers () kernel ! org
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From: Eric Biggers <ebiggers@google.com>

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>
---
 common/filter | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/common/filter b/common/filter
index 26fc2132..2477f386 100644
--- a/common/filter
+++ b/common/filter
@@ -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.
-- 
2.23.0.444.g18eeb5a265-goog

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