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btrfs: Add ctime/mtime update for btrfs device add/remove.

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Btrfs will send uevent to udev inform the device change,
but ctime/mtime for the block device inode is not udpated, which cause
libblkid used by btrfs-progs unable to detect device change and use old
cache, causing 'btrfs dev scan; btrfs dev rmove; btrfs dev scan' give an
error message.

Reported-by: Tsutomu Itoh <t-itoh@jp.fujitsu.com>
Cc: Karel Zak <kzak@redhat.com>
Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: Chris Mason <clm@fb.com>
This commit is contained in:
Qu Wenruo 2014-04-16 17:02:32 +08:00 committed by Chris Mason
parent 61155aa04e
commit 5a1972bd9f
1 changed files with 24 additions and 2 deletions
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26
fs/btrfs/volumes.c
View File

@ -1452,6 +1452,22 @@ out:
return ret;
}
/*
* Function to update ctime/mtime for a given device path.
* Mainly used for ctime/mtime based probe like libblkid.
*/
static void update_dev_time(char *path_name)
{
struct file *filp;
filp = filp_open(path_name, O_RDWR, 0);
if (!filp)
return;
file_update_time(filp);
filp_close(filp, NULL);
return;
}
static int btrfs_rm_dev_item(struct btrfs_root *root,
struct btrfs_device *device)
{
@ -1704,10 +1720,14 @@ int btrfs_rm_device(struct btrfs_root *root, char *device_path)
ret = 0;
/* Notify udev that device has changed */
if (bdev)
if (bdev) {
/* Notify udev that device has changed */
btrfs_kobject_uevent(bdev, KOBJ_CHANGE);
/* Update ctime/mtime for device path for libblkid */
update_dev_time(device_path);
}
error_brelse:
brelse(bh);
if (bdev)
@ -2146,6 +2166,8 @@ int btrfs_init_new_device(struct btrfs_root *root, char *device_path)
ret = btrfs_commit_transaction(trans, root);
}
/* Update ctime/mtime for libblkid */
update_dev_time(device_path);
return ret;
error_trans: