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authorJosef Bacik <josef@toxicpanda.com>2021-10-14 13:11:01 -0400
committerDavid Sterba <dsterba@suse.com>2021-10-26 19:08:08 +0200
commit54fde91f52f515e0b1514f0f0fa146e87a672227 (patch)
treefd78049f391bcaa363c13a292df11ca4977a875b
parente60feb445fce9e51c1558a6aa7faf9dd5ded533b (diff)
btrfs: update device path inode time instead of bd_inode
Christoph pointed out that I'm updating bdev->bd_inode for the device time when we remove block devices from a btrfs file system, however this isn't actually exposed to anything. The inode we want to update is the one that's associated with the path to the device, usually on devtmpfs, so that blkid notices the difference. We still don't want to do the blkdev_open, so use kern_path() to get the path to the given device and do the update time on that inode. Fixes: 8f96a5bfa150 ("btrfs: update the bdev time directly when closing") Reported-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Josef Bacik <josef@toxicpanda.com> Signed-off-by: David Sterba <dsterba@suse.com>
-rw-r--r--fs/btrfs/volumes.c21
1 files changed, 13 insertions, 8 deletions
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 9eab8a741166..a8ea3f88c4db 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -14,6 +14,7 @@
#include <linux/semaphore.h>
#include <linux/uuid.h>
#include <linux/list_sort.h>
+#include <linux/namei.h>
#include "misc.h"
#include "ctree.h"
#include "extent_map.h"
@@ -1888,18 +1889,22 @@ out:
/*
* Function to update ctime/mtime for a given device path.
* Mainly used for ctime/mtime based probe like libblkid.
+ *
+ * We don't care about errors here, this is just to be kind to userspace.
*/
-static void update_dev_time(struct block_device *bdev)
+static void update_dev_time(const char *device_path)
{
- struct inode *inode = bdev->bd_inode;
+ struct path path;
struct timespec64 now;
+ int ret;
- /* Shouldn't happen but just in case. */
- if (!inode)
+ ret = kern_path(device_path, LOOKUP_FOLLOW, &path);
+ if (ret)
return;
- now = current_time(inode);
- generic_update_time(inode, &now, S_MTIME | S_CTIME);
+ now = current_time(d_inode(path.dentry));
+ inode_update_time(d_inode(path.dentry), &now, S_MTIME | S_CTIME);
+ path_put(&path);
}
static int btrfs_rm_dev_item(struct btrfs_device *device)
@@ -2077,7 +2082,7 @@ void btrfs_scratch_superblocks(struct btrfs_fs_info *fs_info,
btrfs_kobject_uevent(bdev, KOBJ_CHANGE);
/* Update ctime/mtime for device path for libblkid */
- update_dev_time(bdev);
+ update_dev_time(device_path);
}
int btrfs_rm_device(struct btrfs_fs_info *fs_info,
@@ -2775,7 +2780,7 @@ int btrfs_init_new_device(struct btrfs_fs_info *fs_info, const char *device_path
btrfs_forget_devices(device_path);
/* Update ctime/mtime for blkid or udev */
- update_dev_time(bdev);
+ update_dev_time(device_path);
return ret;