7a62d0f073
This commit continues hardening the scanning code to handle cases where power loss could have caused disks in a multi-disk filesystem to be in inconsistent state. Namely handle the situation that can occur when some of the disks in multi-disk fs have completed their fsid change i.e they have METADATA_UUID incompat flag set, have cleared the CHANGING_FSID_V2 flag and their fsid/metadata_uuid are different. At the same time the other half of the disks will have their fsid/metadata_uuid unchanged and will only have CHANGING_FSID_V2 flag. This is handled by introducing code in the scan path which: a) Handles the case when a device with CHANGING_FSID_V2 flag is scanned and as a result btrfs_fs_devices is created with matching fsid/metdata_uuid. Subsequently, when a device with completed fsid change is scanned it will detect this via the new code in find_fsid i.e that such an fs_devices exist that fsid_change flag is set to true, it's metadata_uuid/fsid match and the metadata_uuid of the scanned device matches that of the fs_devices. In this case, it's important to note that the devices which has its fsid change completed will have a higher generation number than the device with FSID_CHANGING_V2 flag set, so its superblock block will be used during mount. To prevent an assertion triggering because the sb used for mounting will have differing fsid/metadata_uuid than the ones in the fs_devices struct also add code in device_list_add which overwrites the values in fs_devices. b) Alternatively we can end up with a device that completed its fsid change be scanned first which will create the respective btrfs_fs_devices struct with differing fsid/metadata_uuid. In this case when a device with FSID_CHANGING_V2 flag set is scanned it will call the newly added find_fsid_inprogress function which will return the correct fs_devices. Signed-off-by: Nikolay Borisov <nborisov@suse.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com> |
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.. | ||
tests | ||
acl.c | ||
async-thread.c | ||
async-thread.h | ||
backref.c | ||
backref.h | ||
btrfs_inode.h | ||
check-integrity.c | ||
check-integrity.h | ||
compression.c | ||
compression.h | ||
ctree.c | ||
ctree.h | ||
dedupe.h | ||
delayed-inode.c | ||
delayed-inode.h | ||
delayed-ref.c | ||
delayed-ref.h | ||
dev-replace.c | ||
dev-replace.h | ||
dir-item.c | ||
disk-io.c | ||
disk-io.h | ||
export.c | ||
export.h | ||
extent-tree.c | ||
extent_io.c | ||
extent_io.h | ||
extent_map.c | ||
extent_map.h | ||
file-item.c | ||
file.c | ||
free-space-cache.c | ||
free-space-cache.h | ||
free-space-tree.c | ||
free-space-tree.h | ||
inode-item.c | ||
inode-map.c | ||
inode-map.h | ||
inode.c | ||
ioctl.c | ||
Kconfig | ||
locking.c | ||
locking.h | ||
lzo.c | ||
Makefile | ||
math.h | ||
ordered-data.c | ||
ordered-data.h | ||
orphan.c | ||
print-tree.c | ||
print-tree.h | ||
props.c | ||
props.h | ||
qgroup.c | ||
qgroup.h | ||
raid56.c | ||
raid56.h | ||
rcu-string.h | ||
reada.c | ||
ref-verify.c | ||
ref-verify.h | ||
relocation.c | ||
root-tree.c | ||
scrub.c | ||
send.c | ||
send.h | ||
struct-funcs.c | ||
super.c | ||
sysfs.c | ||
sysfs.h | ||
transaction.c | ||
transaction.h | ||
tree-checker.c | ||
tree-checker.h | ||
tree-defrag.c | ||
tree-log.c | ||
tree-log.h | ||
ulist.c | ||
ulist.h | ||
uuid-tree.c | ||
volumes.c | ||
volumes.h | ||
xattr.c | ||
xattr.h | ||
zlib.c | ||
zstd.c |