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Allow fetching the pool from the device at mount

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To simplify integration with the xfstests test suite the
mount.zfs helper has been extended.  When passed a block
device (/dev/sdX) to mount, instead of a pool/dataset,
the pool name will be read from any existing zfs label
and used.  This allows you to mount the root dataset of
a zfs filesystem by specifing any of the member vdevs.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
This commit is contained in:
Brian Behlendorf 2013-06-25 15:43:09 -07:00
parent 389cf730ce
commit 0c1171dcb5
1 changed files with 42 additions and 4 deletions
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46
cmd/mount_zfs/mount_zfs.c
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@ -211,17 +211,55 @@ out:
}
/*
* If a file or directory in your current working directory is named
* 'dataset' then mount(8) will prepend your current working directory
* to dataset. The is no way to prevent this behavior so we simply
* check for it and strip the prepended patch when it is added.
* Return the pool/dataset to mount given the name passed to mount. This
* is expected to be of the form pool/dataset, however may also refer to
* a block device if that device contains a valid zfs label.
*/
static char *
parse_dataset(char *dataset)
{
char cwd[PATH_MAX];
struct stat64 statbuf;
int error;
int len;
/*
* We expect a pool/dataset to be provided, however if we're
* given a device which is a member of a zpool we attempt to
* extract the pool name stored in the label. Given the pool
* name we can mount the root dataset.
*/
error = stat64(dataset, &statbuf);
if (error == 0) {
nvlist_t *config;
char *name;
int fd;
fd = open(dataset, O_RDONLY);
if (fd < 0)
goto out;
error = zpool_read_label(fd, &config);
(void) close(fd);
if (error)
goto out;
error = nvlist_lookup_string(config,
ZPOOL_CONFIG_POOL_NAME, &name);
if (error == 0)
dataset = strdup(name);
nvlist_free(config);
return (dataset);
}
out:
/*
* If a file or directory in your current working directory is
* named 'dataset' then mount(8) will prepend your current working
* directory to the dataset. There is no way to prevent this
* behavior so we simply check for it and strip the prepended
* patch when it is added.
*/
if (getcwd(cwd, PATH_MAX) == NULL)
return (dataset);