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blockdev-util: update comment for blockdev_partscan_enabled

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Follow-up for aa6fe772e1

Also, the 'partscan' sysattr has been backported to v6.6.
This commit is contained in:
Mike Yuan
2024-05-30 10:57:30 +02:00
committed by Luca Boccassi
parent d24ceef937
commit a6117106e4
1 changed files with 5 additions and 4 deletions
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src/shared/blockdev-util.c
+5 -4
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@@ -398,14 +398,15 @@ int blockdev_partscan_enabled(int fd) {
* the 'capability' sysfs attribute is deprecated, hence we cannot check flags from it. 💣💣💣
*
* With https://github.com/torvalds/linux/commit/a4217c6740dc64a3eb6815868a9260825e8c68c6 (v6.10,
* backported to v6.9), the partscan status is directly exposed as 'partscan' sysattr.
* backported to v6.6+), the partscan status is directly exposed as 'partscan' sysattr.
*
* To support both old and new kernels, we need to do the following:
* 1) check 'partscan' sysfs attribute where the information is made directly available,
* 2) check 'loop/partscan' sysfs attribute for loopback block devices, and if '0' we can conclude
* 2) check if the blockdev refers to a partition, where partscan is not supported,
* 3) check 'loop/partscan' sysfs attribute for loopback block devices, and if '0' we can conclude
* partition scanning is disabled,
* 3) check 'ext_range' sysfs attribute, and if '1' we can conclude partition scanning is disabled,
* 4) otherwise check 'capability' sysfs attribute for ancient version. */
* 4) check 'ext_range' sysfs attribute, and if '1' we can conclude partition scanning is disabled,
* 5) otherwise check 'capability' sysfs attribute for ancient version. */
assert(fd >= 0);