exofs: Add option to mount by osdname
If /dev/osd* devices are shuffled because more devices
where added, and/or login order has changed. It is hard to
mount the FS you want.
Add an option to mount by osdname. osdname is any osd-device's
osdname as specified to the mkfs.exofs command when formatting
the osd-devices.
The new mount format is:
OPT="osdname=$UUID0,pid=$PID,_netdev"
mount -t exofs -o $OPT $DEV_OSD0 $MOUNTDIR
if "osdname=" is specified in options above $DEV_OSD0 is
ignored and can be empty.
Also while at it: Removed some old unused Opt_* enums.
Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
diff --git a/fs/exofs/super.c b/fs/exofs/super.c
index e87510f..474989e 100644
--- a/fs/exofs/super.c
+++ b/fs/exofs/super.c
@@ -48,6 +48,7 @@
* struct to hold what we get from mount options
*/
struct exofs_mountopt {
+ bool is_osdname;
const char *dev_name;
uint64_t pid;
int timeout;
@@ -56,7 +57,7 @@
/*
* exofs-specific mount-time options.
*/
-enum { Opt_pid, Opt_to, Opt_mkfs, Opt_format, Opt_err };
+enum { Opt_name, Opt_pid, Opt_to, Opt_err };
/*
* Our mount-time options. These should ideally be 64-bit unsigned, but the
@@ -64,6 +65,7 @@
* sufficient for most applications now.
*/
static match_table_t tokens = {
+ {Opt_name, "osdname=%s"},
{Opt_pid, "pid=%u"},
{Opt_to, "to=%u"},
{Opt_err, NULL}
@@ -94,6 +96,14 @@
token = match_token(p, tokens, args);
switch (token) {
+ case Opt_name:
+ opts->dev_name = match_strdup(&args[0]);
+ if (unlikely(!opts->dev_name)) {
+ EXOFS_ERR("Error allocating dev_name");
+ return -ENOMEM;
+ }
+ opts->is_osdname = true;
+ break;
case Opt_pid:
if (0 == match_strlcpy(str, &args[0], sizeof(str)))
return -EINVAL;
@@ -575,9 +585,17 @@
goto free_bdi;
/* use mount options to fill superblock */
- od = osduld_path_lookup(opts->dev_name);
+ if (opts->is_osdname) {
+ struct osd_dev_info odi = {.systemid_len = 0};
+
+ odi.osdname_len = strlen(opts->dev_name);
+ odi.osdname = (u8 *)opts->dev_name;
+ od = osduld_info_lookup(&odi);
+ } else {
+ od = osduld_path_lookup(opts->dev_name);
+ }
if (IS_ERR(od)) {
- ret = PTR_ERR(od);
+ ret = -EINVAL;
goto free_sbi;
}
@@ -670,6 +688,8 @@
_exofs_print_device("Mounting", opts->dev_name, sbi->layout.s_ods[0],
sbi->layout.s_pid);
+ if (opts->is_osdname)
+ kfree(opts->dev_name);
return 0;
free_sbi:
@@ -678,6 +698,8 @@
EXOFS_ERR("Unable to mount exofs on %s pid=0x%llx err=%d\n",
opts->dev_name, sbi->layout.s_pid, ret);
exofs_free_sbi(sbi);
+ if (opts->is_osdname)
+ kfree(opts->dev_name);
return ret;
}
@@ -695,7 +717,8 @@
if (ret)
return ERR_PTR(ret);
- opts.dev_name = dev_name;
+ if (!opts.dev_name)
+ opts.dev_name = dev_name;
return mount_nodev(type, flags, &opts, exofs_fill_super);
}