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[Qemu-devel] [PATCH v6 16/24] qemu-img: Drop redundant error message in
From: |
Eric Blake |
Subject: |
[Qemu-devel] [PATCH v6 16/24] qemu-img: Drop redundant error message in compare |
Date: |
Wed, 11 Oct 2017 22:47:12 -0500 |
If a read error is encountered during 'qemu-img compare', we
were printing the "Error while reading offset ..." message twice;
this was because our helper function was awkward, printing output
on some but not all paths. Fix it to consistently report errors
on all paths, so that the callers do not risk a redundant message,
and update the testsuite for the improved output.
Further simplify the code by hoisting the conversion from an error
message to an exit code into the helper function, rather than
repeating that logic at all callers (yes, the helper function is
now less generic, but it's a net win in lines of code).
Signed-off-by: Eric Blake <address@hidden>
Reviewed-by: John Snow <address@hidden>
---
v5: tweak commit message, but no code change
v4: no change
v3: new patch
---
qemu-img.c | 19 +++++--------------
tests/qemu-iotests/074.out | 2 --
2 files changed, 5 insertions(+), 16 deletions(-)
diff --git a/qemu-img.c b/qemu-img.c
index 89f1093d81..53cae6bb66 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -1197,8 +1197,10 @@ static int64_t sectors_to_bytes(int64_t sectors)
/*
* Check if passed sectors are empty (not allocated or contain only 0 bytes)
*
- * Returns 0 in case sectors are filled with 0, 1 if sectors contain non-zero
- * data and negative value on error.
+ * Intended for use by 'qemu-img compare': Returns 0 in case sectors are
+ * filled with 0, 1 if sectors contain non-zero data (this is a comparison
+ * failure), and 4 on error (the exit status for read errors), after emitting
+ * an error message.
*
* @param blk: BlockBackend for the image
* @param sect_num: Number of first sector to check
@@ -1219,7 +1221,7 @@ static int check_empty_sectors(BlockBackend *blk, int64_t
sect_num,
if (ret < 0) {
error_report("Error while reading offset %" PRId64 " of %s: %s",
sectors_to_bytes(sect_num), filename, strerror(-ret));
- return ret;
+ return 4;
}
idx = find_nonzero(buffer, sect_count * BDRV_SECTOR_SIZE);
if (idx >= 0) {
@@ -1476,11 +1478,6 @@ static int img_compare(int argc, char **argv)
filename2, buf1, quiet);
}
if (ret) {
- if (ret < 0) {
- error_report("Error while reading offset %" PRId64 ": %s",
- sectors_to_bytes(sector_num), strerror(-ret));
- ret = 4;
- }
goto out;
}
}
@@ -1525,12 +1522,6 @@ static int img_compare(int argc, char **argv)
ret = check_empty_sectors(blk_over, sector_num, nb_sectors,
filename_over, buf1, quiet);
if (ret) {
- if (ret < 0) {
- error_report("Error while reading offset %" PRId64
- " of %s: %s",
sectors_to_bytes(sector_num),
- filename_over, strerror(-ret));
- ret = 4;
- }
goto out;
}
}
diff --git a/tests/qemu-iotests/074.out b/tests/qemu-iotests/074.out
index 8fba5aea9c..ede66c3f81 100644
--- a/tests/qemu-iotests/074.out
+++ b/tests/qemu-iotests/074.out
@@ -4,7 +4,6 @@ Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824
wrote 512/512 bytes at offset 512
512 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
qemu-img: Error while reading offset 0 of
blkdebug:TEST_DIR/blkdebug.conf:TEST_DIR/t.IMGFMT: Input/output error
-qemu-img: Error while reading offset 0: Input/output error
4
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824
Formatting 'TEST_DIR/t.IMGFMT.2', fmt=IMGFMT size=0
@@ -12,7 +11,6 @@ Formatting 'TEST_DIR/t.IMGFMT.2', fmt=IMGFMT size=0
wrote 512/512 bytes at offset 512
512 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
qemu-img: Error while reading offset 0 of
blkdebug:TEST_DIR/blkdebug.conf:TEST_DIR/t.IMGFMT: Input/output error
-qemu-img: Error while reading offset 0 of
blkdebug:TEST_DIR/blkdebug.conf:TEST_DIR/t.IMGFMT: Input/output error
Warning: Image size mismatch!
4
Cleanup
--
2.13.6
- [Qemu-devel] [PATCH v6 10/24] block: Switch bdrv_common_block_status_above() to byte-based, (continued)
- [Qemu-devel] [PATCH v6 13/24] qemu-img: Simplify logic in img_compare(), Eric Blake, 2017/10/11
- [Qemu-devel] [PATCH v6 15/24] qemu-img: Add find_nonzero(), Eric Blake, 2017/10/11
- [Qemu-devel] [PATCH v6 14/24] qemu-img: Speed up compare on pre-allocated larger file, Eric Blake, 2017/10/11
- [Qemu-devel] [PATCH v6 17/24] qemu-img: Change check_empty_sectors() to byte-based, Eric Blake, 2017/10/11
- [Qemu-devel] [PATCH v6 16/24] qemu-img: Drop redundant error message in compare,
Eric Blake <=
- [Qemu-devel] [PATCH v6 18/24] qemu-img: Change compare_sectors() to be byte-based, Eric Blake, 2017/10/11
- [Qemu-devel] [PATCH v6 19/24] qemu-img: Change img_rebase() to be byte-based, Eric Blake, 2017/10/11
- [Qemu-devel] [PATCH v6 20/24] qemu-img: Change img_compare() to be byte-based, Eric Blake, 2017/10/11
- [Qemu-devel] [PATCH v6 22/24] block: Relax bdrv_aligned_preadv() assertion, Eric Blake, 2017/10/11
- [Qemu-devel] [PATCH v6 21/24] block: Align block status requests, Eric Blake, 2017/10/11
- [Qemu-devel] [PATCH v6 23/24] qcow2: Relax is_zero() assertion, Eric Blake, 2017/10/11
[Qemu-devel] [PATCH v6 24/24] qemu-io: Relax 'alloc' now that block-status doesn't assert, Eric Blake, 2017/10/11