forked from Mirrors/btrfs-progs
btrfs-progs: fix BUG_ON when all devices under seed fs are missing
Steps to reproduce: # mkfs.btrfs -f /dev/sda[1-2] # btrfstune -S 1 /dev/sda1 # mount /dev/sda /mnt # btrfs dev add /dev/sda3 /mnt # umount /mnt # mkfs.ext4 /dev/sda1 // kill seed dev # mkfs.ext4 /dev/sda2 // kill seed dev # btrfs-debug-tree /dev/sda3 <== BUG_ON Output msg: volumes.c:1824: btrfs_read_chunk_tree: Assertion `ret` failed. btrfs-debug-tree[0x41cb36] btrfs-debug-tree(btrfs_read_chunk_tree+0x3ca) btrfs-debug-tree(btrfs_setup_chunk_tree_and_device_map btrfs-debug-tree[0x40f695] btrfs-debug-tree(open_ctree_fs_info+0x86) btrfs-debug-tree(main+0x12d) /lib64/libc.so.6(__libc_start_main+0xf5) btrfs-debug-tree[0x4062e9] This BUG_ON complains about a failed @read_one_dev() call when @open_seed_devices() failed to find the seed @fs_devices object for a dev_item in chunk tree. In this case, just insert a "shadow" @fs_devices with the fsid in dev_item shall make no harm since no other tools will try to make use of the stuff that the "shadow" @fs_devices possesses after its creation. After apply this commit, btrfs-debug-tree will report unable to open the device. Signed-off-by: Gui Hecheng <guihc.fnst@cn.fujitsu.com> Signed-off-by: David Sterba <dsterba@suse.cz>master
parent
0cf497719c
commit
cb37bf83cc
11
volumes.c
11
volumes.c
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@ -1672,8 +1672,15 @@ static int open_seed_devices(struct btrfs_root *root, u8 *fsid)
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fs_devices = find_fsid(fsid);
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if (!fs_devices) {
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ret = -ENOENT;
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goto out;
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/* missing all seed devices */
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fs_devices = kzalloc(sizeof(*fs_devices), GFP_NOFS);
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if (!fs_devices) {
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ret = -ENOMEM;
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goto out;
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}
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INIT_LIST_HEAD(&fs_devices->devices);
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list_add(&fs_devices->list, &fs_uuids);
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memcpy(fs_devices->fsid, fsid, BTRFS_FSID_SIZE);
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}
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ret = btrfs_open_devices(fs_devices, O_RDONLY);
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