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Fix missing vdev names in zpool status output 

Top-level vdev names in zpool status output should follow a <type-id> naming
convention.  In the case of raidz devices, the type portion of the name was
missing.

This commit fixes a bug in zpool_vdev_name() where in this snprintf call

	(void) snprintf(buf, sizeof (buf), "%s-%llu", path,
		(u_longlong_t)id);

buf and path may point to the same location.  The result is that buf ends up
containing only the "-id" part.  This only occurred for raidz devices because
the code for appending the parity level to the type string stored its result in
buf then set path to point there.  To fix this we allocate a new temporary
buffer on the stack instead of reusing buf.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #57
This commit is contained in:
Ned Bass 2010-09-22 18:53:59 -07:00 committed by Brian Behlendorf
parent 368f4c10ae
commit 858219cc4e
1 changed files with 7 additions and 3 deletions
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10
lib/libzfs/libzfs_pool.c
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@ -3047,6 +3047,8 @@ set_path(zpool_handle_t *zhp, nvlist_t *nv, const char *path)
(void) ioctl(zhp->zpool_hdl->libzfs_fd, ZFS_IOC_VDEV_SETPATH, &zc); (void) ioctl(zhp->zpool_hdl->libzfs_fd, ZFS_IOC_VDEV_SETPATH, &zc);
} }
#define PATH_BUF_LEN 64
/* /*
* Given a vdev, return the name to display in iostat. If the vdev has a path, * Given a vdev, return the name to display in iostat. If the vdev has a path,
* we use that, stripping off any leading "/dev/dsk/"; if not, we use the type. * we use that, stripping off any leading "/dev/dsk/"; if not, we use the type.
@ -3068,7 +3070,7 @@ zpool_vdev_name(libzfs_handle_t *hdl, zpool_handle_t *zhp, nvlist_t *nv,
{ {
char *path, *devid, *type; char *path, *devid, *type;
uint64_t value; uint64_t value;
char buf[64]; char buf[PATH_BUF_LEN];
vdev_stat_t *vs; vdev_stat_t *vs;
uint_t vsc; uint_t vsc;
@ -3160,11 +3162,13 @@ zpool_vdev_name(libzfs_handle_t *hdl, zpool_handle_t *zhp, nvlist_t *nv,
* If it's a raidz device, we need to stick in the parity level. * If it's a raidz device, we need to stick in the parity level.
*/ */
if (strcmp(path, VDEV_TYPE_RAIDZ) == 0) { if (strcmp(path, VDEV_TYPE_RAIDZ) == 0) {
char tmpbuf[PATH_BUF_LEN];
verify(nvlist_lookup_uint64(nv, ZPOOL_CONFIG_NPARITY, verify(nvlist_lookup_uint64(nv, ZPOOL_CONFIG_NPARITY,
&value) == 0); &value) == 0);
(void) snprintf(buf, sizeof (buf), "%s%llu", path, (void) snprintf(tmpbuf, sizeof (tmpbuf), "%s%llu", path,
(u_longlong_t)value); (u_longlong_t)value);
path = buf; path = tmpbuf;
} }
/* /*