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Turn on/off enclosure slot fault LED even when disk isn't present

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Previously when a drive faulted, the statechange-led.sh script would lookup
the drive's LED sysfs entry in /sys/block/sd*/device/enclosure_device, and
turn it on.  During testing we noticed that if you pulled out a drive, or if
the drive was so badly broken that it no longer appeared to Linux, that the
/sys/block/sd* path would be removed, and the script could not lookup the
LED entry.

To fix this, this patch looks up the disks's more persistent
"/sys/class/enclosure/X:X:X:X/Slot N" LED sysfs path at pool import.  It then
passes that path to the statechange-led script to use, rather than having the
script look it up on the fly.  This allows the script to turn on/off the slot
LEDs even when the drive is missing.

Closes #5309 
Closes #2375
This commit is contained in:
Tony Hutter
2016-10-24 10:45:59 -07:00
committed by Brian Behlendorf
parent a85cefa35c
commit 1bbd877049
13 changed files with 217 additions and 82 deletions
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include/libzfs.h
+3 -2
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@@ -280,8 +280,9 @@ extern nvlist_t *zpool_find_vdev_by_physpath(zpool_handle_t *, const char *,
extern int zpool_label_disk_wait(char *, int);
extern int zpool_label_disk(libzfs_handle_t *, zpool_handle_t *, char *);
int dev_is_dm(char *devname);
char *get_underlying_path(libzfs_handle_t *hdl, char *dev_name);
int zfs_dev_is_dm(char *dev_name);
char *zfs_get_underlying_path(char *dev_name);
char *zfs_get_enclosure_sysfs_path(char *dev_name);
/*
* Functions to manage pool properties