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Fix using zvol as slog device

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During the original ZoL port the vdev_uses_zvols() function was
disabled until it could be properly implemented.  This prevented
a zpool from use a zvol for its slog device.

This patch implements that missing functionality by adding a
zvol_is_zvol() function to zvol.c.  Given the full path to a
device it will lookup the device and verify its major number
against the registered zvol major number for the system.  If
they match we know the device is a zvol.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #1131
This commit is contained in:
Jorgen Lundman
2012-12-17 10:33:57 +09:00
committed by Brian Behlendorf
parent 5e6320cd12
commit 6c2856726f
4 changed files with 31 additions and 14 deletions
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include/sys/vdev.h
-1
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@@ -48,7 +48,6 @@ extern int zfs_nocacheflush;
extern int vdev_open(vdev_t *);
extern void vdev_open_children(vdev_t *);
extern boolean_t vdev_uses_zvols(vdev_t *);
extern int vdev_validate(vdev_t *, boolean_t);
extern void vdev_close(vdev_t *);
extern int vdev_create(vdev_t *, uint64_t txg, boolean_t isreplace);