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btrfs: allow scanning multiple devices during mount 

Allows to specify one or multiple device=/dev/foo options during mount
so that ioctls on the control device can be avoided.  Especially useful
when trying to mount a multi-device setup as root.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Christoph Hellwig 2008-06-10 10:40:46 -04:00 committed by Chris Mason
parent edf24abe51
commit 43e570b08a
1 changed files with 16 additions and 5 deletions
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21
fs/btrfs/super.c
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@ -65,7 +65,7 @@ static void btrfs_put_super (struct super_block * sb)
}
enum {
Opt_degraded, Opt_subvol, Opt_nodatasum, Opt_nodatacow,
Opt_degraded, Opt_subvol, Opt_device, Opt_nodatasum, Opt_nodatacow,
Opt_max_extent, Opt_max_inline, Opt_alloc_start, Opt_nobarrier,
Opt_ssd, Opt_err,
};
@ -73,6 +73,7 @@ enum {
static match_table_t tokens = {
{Opt_degraded, "degraded"},
{Opt_subvol, "subvol=%s"},
{Opt_device, "device=%s"},
{Opt_nodatasum, "nodatasum"},
{Opt_nodatacow, "nodatacow"},
{Opt_nobarrier, "nobarrier"},
@ -142,8 +143,9 @@ int btrfs_parse_options(struct btrfs_root *root, char *options)
btrfs_set_opt(info->mount_opt, DEGRADED);
break;
case Opt_subvol:
case Opt_device:
/*
* This one is parsed by btrfs_parse_early_options
* These are parsed by btrfs_parse_early_options
* and can be happily ignored here.
*/
break;
@ -212,8 +214,9 @@ int btrfs_parse_options(struct btrfs_root *root, char *options)
* All other options will be parsed on much later in the mount process and
* only when we need to allocate a new super block.
*/
static int btrfs_parse_early_options(const char *options,
char **subvol_name)
static int btrfs_parse_early_options(const char *options, int flags,
void *holder, char **subvol_name,
struct btrfs_fs_devices **fs_devices)
{
substring_t args[MAX_OPT_ARGS];
char *opts, *p;
@ -240,11 +243,18 @@ static int btrfs_parse_early_options(const char *options,
case Opt_subvol:
*subvol_name = match_strdup(&args[0]);
break;
case Opt_device:
error = btrfs_scan_one_device(match_strdup(&args[0]),
flags, holder, fs_devices);
if (error)
goto out_free_opts;
break;
default:
break;
}
}
out_free_opts:
kfree(opts);
out:
/*
@ -380,7 +390,8 @@ static int btrfs_get_sb(struct file_system_type *fs_type, int flags,
struct btrfs_fs_devices *fs_devices = NULL;
int error = 0;
error = btrfs_parse_early_options(data, &subvol_name);
error = btrfs_parse_early_options(data, flags, fs_type,
&subvol_name, &fs_devices);
if (error)
goto error;