Commit c5502451 authored by Qu Wenruo's avatar Qu Wenruo Committed by David Sterba
Browse files

btrfs: Enhance message when a device is missing during mount 



For a missing device, btrfs will just refuse to mount with almost
meaningless kernel message like:

 BTRFS info (device vdb6): disk space caching is enabled
 BTRFS info (device vdb6): has skinny extents
 BTRFS error (device vdb6): failed to read the system array: -5
 BTRFS error (device vdb6): open_ctree failed

This patch will print a new message about the missing device:

 BTRFS info (device vdb6): disk space caching is enabled
 BTRFS info (device vdb6): has skinny extents
 BTRFS warning (device vdb6): devid 2 uuid 80470722-cad2-4b90-b7c3-fee294552f1b is missing
 BTRFS error (device vdb6): failed to read the system array: -5
 BTRFS error (device vdb6): open_ctree failed

Signed-off-by: default avatarQu Wenruo <quwenruo@cn.fujitsu.com>
Reviewed-by: default avatarAnand Jain <anand.jain@oracle.com>
Reviewed-by: default avatarDavid Sterba <dsterba@suse.com>
Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent bc3cce23

fs/btrfs/volumes.c

+17 −7
Original line number Diff line number Diff line
@@ -6492,6 +6492,7 @@ static int read_one_chunk(struct btrfs_fs_info *fs_info, struct btrfs_key *key, 
		if (!map->stripes[i].dev &&

		    !btrfs_test_opt(fs_info, DEGRADED)) {

			free_extent_map(em);

			btrfs_report_missing_device(fs_info, devid, uuid);

			return -EIO;

		}

		if (!map->stripes[i].dev) {
@@ -6502,8 +6503,7 @@ static int read_one_chunk(struct btrfs_fs_info *fs_info, struct btrfs_key *key, 
				free_extent_map(em);

				return -EIO;

			}

			btrfs_warn(fs_info, "devid %llu uuid %pU is missing",

				   devid, uuid);

			btrfs_report_missing_device(fs_info, devid, uuid);

		}

		map->stripes[i].dev->in_fs_metadata = 1;

	}
@@ -6620,17 +6620,21 @@ static int read_one_dev(struct btrfs_fs_info *fs_info, 


	device = btrfs_find_device(fs_info, devid, dev_uuid, fs_uuid);

	if (!device) {

		if (!btrfs_test_opt(fs_info, DEGRADED))

		if (!btrfs_test_opt(fs_info, DEGRADED)) {

			btrfs_report_missing_device(fs_info, devid, dev_uuid);

			return -EIO;

		}



		device = add_missing_dev(fs_devices, devid, dev_uuid);

		if (!device)

			return -ENOMEM;

		btrfs_warn(fs_info, "devid %llu uuid %pU missing",

				devid, dev_uuid);

		btrfs_report_missing_device(fs_info, devid, dev_uuid);

	} else {

		if (!device->bdev && !btrfs_test_opt(fs_info, DEGRADED))

		if (!device->bdev) {

			btrfs_report_missing_device(fs_info, devid, dev_uuid);

			if (!btrfs_test_opt(fs_info, DEGRADED))

				return -EIO;

		}



		if(!device->bdev && !device->missing) {

			/*
@@ -6796,6 +6800,12 @@ out_short_read: 
	return -EIO;

}



void btrfs_report_missing_device(struct btrfs_fs_info *fs_info, u64 devid,

				 u8 *uuid)

{

	btrfs_warn_rl(fs_info, "devid %llu uuid %pU is missing", devid, uuid);

}



/*

 * Check if all chunks in the fs are OK for read-write degraded mount

 *

fs/btrfs/volumes.h

+2 −0
Original line number Diff line number Diff line
@@ -544,5 +544,7 @@ void btrfs_set_fs_info_ptr(struct btrfs_fs_info *fs_info); 
void btrfs_reset_fs_info_ptr(struct btrfs_fs_info *fs_info);



bool btrfs_check_rw_degradable(struct btrfs_fs_info *fs_info);

void btrfs_report_missing_device(struct btrfs_fs_info *fs_info, u64 devid,

				 u8 *uuid);



#endif

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