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btrfs-progs: introduce btrfs_register_all_device()

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This function is to register all devices found after scanning
the system. Before we had this functionality with in the
btrfs_scan_lblkid(), however scanning and registering are two
different distinct operation its better keep them separate.
Also we want to optimize btrfs_scan_lblkid and avoid multiple
system scans unless needed. As of now device scan uses this function.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.cz>
This commit is contained in:
Anand Jain 2014-10-31 12:11:19 +08:00 committed by David Sterba
parent dcf11c371c
commit 53cb7fbe8d
2 changed files with 28 additions and 0 deletions
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27
utils.c
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@ -1266,6 +1266,33 @@ int btrfs_register_one_device(const char *fname)
return ret;
}
/*
* Register all devices in the fs_uuid list created in the user
* space. Ensure btrfs_scan_lblkid() is called before this func.
*/
int btrfs_register_all_devices(void)
{
int err;
struct btrfs_fs_devices *fs_devices;
struct btrfs_device *device;
struct list_head *all_uuids;
all_uuids = btrfs_scanned_uuids();
list_for_each_entry(fs_devices, all_uuids, list) {
list_for_each_entry(device, &fs_devices->devices, dev_list) {
if (strlen(device->name) != 0) {
err = btrfs_register_one_device(device->name);
if (err < 0)
return err;
if (err > 0)
return -err;
}
}
}
return 0;
}
int btrfs_device_already_in_root(struct btrfs_root *root, int fd,
int super_offset)
{

1
utils.h
View File

@ -82,6 +82,7 @@ int btrfs_add_to_fsid(struct btrfs_trans_handle *trans,
u32 sectorsize);
int btrfs_scan_for_fsid(int run_ioctls);
int btrfs_register_one_device(const char *fname);
int btrfs_register_all_devices(void);
char *canonicalize_dm_name(const char *ptname);
char *canonicalize_path(const char *path);
int check_mounted(const char *devicename);