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Fix intermittent 'zpool add' failures 

Creating whole-disk vdevs can intermittently fail if a udev-managed symlink to
the disk partition is already in place.  To avoid this, we now remove any such
symlink before partitioning the disk.  This makes zpool_label_disk_wait() truly
wait for the new link to show up instead of returning if it finds an old link
still in place.  Otherwise there is a window between when udev deletes and
recreates the link during which access attempts will fail with ENOENT.

Also, clean up a comment about waiting for udev to create symlinks.  It no
longer needs to describe the special cases for the link names, since that is
now handled in a separate helper function.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
This commit is contained in:
Ned Bass 2010-10-21 17:08:30 -07:00 committed by Brian Behlendorf
parent d4055aac3c
commit d877ac6bfe
1 changed files with 27 additions and 15 deletions
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42
cmd/zpool/zpool_vdev.c
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@ -909,8 +909,10 @@ make_disks(zpool_handle_t *zhp, nvlist_t *nv)
nvlist_t **child; nvlist_t **child;
uint_t c, children; uint_t c, children;
char *type, *path, *diskname; char *type, *path, *diskname;
char buf[MAXPATHLEN]; char devpath[MAXPATHLEN];
char udevpath[MAXPATHLEN];
uint64_t wholedisk; uint64_t wholedisk;
struct stat64 statbuf;
int ret; int ret;
verify(nvlist_lookup_string(nv, ZPOOL_CONFIG_TYPE, &type) == 0); verify(nvlist_lookup_string(nv, ZPOOL_CONFIG_TYPE, &type) == 0);
@ -937,32 +939,42 @@ make_disks(zpool_handle_t *zhp, nvlist_t *nv)
return (ret); return (ret);
} }
if (realpath(path, buf) == NULL) { if (realpath(path, devpath) == NULL) {
ret = errno; ret = errno;
(void) fprintf(stderr, (void) fprintf(stderr,
gettext("cannot resolve path '%s'\n"), path); gettext("cannot resolve path '%s'\n"), path);
return (ret); return (ret);
} }
diskname = strrchr(buf, '/'); /*
* Remove any previously existing symlink from a udev path to
* the device before labeling the disk. This makes
* zpool_label_disk_wait() truly wait for the new link to show
* up instead of returning if it finds an old link still in
* place. Otherwise there is a window between when udev
* deletes and recreates the link during which access attempts
* will fail with ENOENT.
*/
zfs_append_partition(path, udevpath, sizeof (udevpath));
if ((strncmp(udevpath, UDISK_ROOT, strlen(UDISK_ROOT)) == 0) &&
(lstat64(udevpath, &statbuf) == 0) &&
S_ISLNK(statbuf.st_mode))
(void) unlink(udevpath);
diskname = strrchr(devpath, '/');
assert(diskname != NULL); assert(diskname != NULL);
diskname++; diskname++;
if (zpool_label_disk(g_zfs, zhp, diskname) == -1) if (zpool_label_disk(g_zfs, zhp, diskname) == -1)
return (-1); return (-1);
/* /*
* Now the we've labeled the disk and the partitions have * Now we've labeled the disk and the partitions have been
* been created. We still need to wait for udev to create * created. We still need to wait for udev to create the
* the symlinks to those partitions. If we are accessing * symlinks to those partitions.
* the devices via a udev disk path, /dev/disk, then wait
* for *-part# to be created. Otherwise just use the normal
* syntax for devices in /dev.
*/ */
zfs_append_partition(path, buf, sizeof (buf)); if ((ret = zpool_label_disk_wait(udevpath, 1000)) != 0) {
if ((ret = zpool_label_disk_wait(buf, 1000)) != 0) {
(void) fprintf(stderr, (void) fprintf(stderr,
gettext( "cannot resolve path '%s'\n"), buf); gettext( "cannot resolve path '%s'\n"), udevpath);
return (-1); return (-1);
} }
@ -972,10 +984,10 @@ make_disks(zpool_handle_t *zhp, nvlist_t *nv)
* chop off the slice number when displaying the device in * chop off the slice number when displaying the device in
* future output. * future output.
*/ */
verify(nvlist_add_string(nv, ZPOOL_CONFIG_PATH, buf) == 0); verify(nvlist_add_string(nv, ZPOOL_CONFIG_PATH, udevpath) == 0);
/* Just in case this partition already existed. */ /* Just in case this partition already existed. */
(void) zero_label(buf); (void) zero_label(udevpath);
return (0); return (0);
} }