5 # lfs_migrate: a simple tool to copy and check files.
7 # To avoid allocating objects on one or more OSTs, they should be
8 # deactivated on the MDS via "lctl --device {device_number} deactivate",
9 # where {device_number} is from the output of "lctl dl" on the MDS.
11 # To guard against corruption, the file is compared after migration
12 # to verify the copy is correct and the file has not been modified.
13 # This is not a protection against the file being open by another
14 # process, but it would catch the worst cases of in-use files, but
15 # to be 100% safe the administrator needs to ensure this is safe.
24 usage: lfs_migrate [-c <stripe_count>] [-h] [-l] [-n] [-q] [-R] [-s] [-y] [-0]
27 restripe file using the specified stripe count
28 -h show this usage message
29 -l migrate files with hard links (skip by default)
30 -n only print the names of files to be migrated
31 -q run quietly (don't print filenames or status)
32 -R restripe file using default directory striping
33 -s skip file data comparison after migrate
34 -y answer 'y' to usage question
35 -0 input file names on stdin are separated by a null character
37 The -c <stripe_count> option may not be specified at the same time as
40 If a directory is an argument, all files in the directory are migrated.
41 If no file/directory is given, the file list is read from standard input.
43 e.g.: lfs_migrate /mnt/lustre/dir
44 lfs find /test -O test-OST0004 -size +4G | lfs_migrate -y
52 while getopts "c:hlnqRsy0" opt $*; do
54 c) OPT_STRIPE_COUNT=$OPTARG;;
56 n) OPT_DRYRUN=n; OPT_YES=y;;
67 if [ "$OPT_STRIPE_COUNT" -a "$OPT_RESTRIPE" ]; then
69 echo "$(basename $0) error: The -c <stripe_count> option may not" 1>&2
70 echo "be specified at the same time as the -R option." 1>&2
74 if [ -z "$OPT_YES" ]; then
76 echo "lfs_migrate is currently NOT SAFE for moving in-use files." 1>&2
77 echo "Use it only when you are sure migrated files are unused." 1>&2
79 echo "If emptying OST(s) that are not disabled on the MDS, new" 1>&2
80 echo "files may use them. To prevent MDS allocating any files on" 1>&2
81 echo "OSTNNNN run 'lctl --device %{fsname}-OSTNNNN-osc deactivate'" 1>&2
82 echo "on the MDS." 1>&2
83 echo -n "Continue? (y/n) "
85 [ "$CHECK" != "y" -a "$CHECK" != "yes" ] && exit 1
88 # if rsync has --xattr support, then try to copy the xattrs.
89 $RSYNC --help 2>&1 | grep -q xattr && RSYNC_OPTS="$RSYNC_OPTS -X"
90 $RSYNC --help 2>&1 | grep -q acls && RSYNC_OPTS="$RSYNC_OPTS -A"
91 # If rsync copies lustre xattrs in the future, then we can skip lfs (bug 22189)
92 strings $(which $RSYNC) 2>&1 | grep -q lustre && LFS=:
94 # rsync creates its temporary files with lenient permissions, even if
95 # permissions on the original files are more strict. Tighten umask here
96 # to avoid the brief window where unprivileged users might be able to
97 # access the temporary file.
100 # This is needed for 1.8 Interoperability and can be removed in the future
101 $LFS getstripe --help 2>&1 | grep -q stripe-size && LFS_SIZE_OPT="-S"
104 local RSYNC_MODE=false
106 while IFS='' read -d '' OLDNAME; do
107 $ECHO -n "$OLDNAME: "
109 # avoid duplicate stat if possible
110 TYPE_LINK=($(LANG=C stat -c "%h %F" "$OLDNAME" || true))
112 # skip non-regular files, since they don't have any objects
113 # and there is no point in trying to migrate them.
114 if [ "${TYPE_LINK[1]}" != "regular" ]; then
115 echo -e "not a regular file, skipped"
119 if [ -z "$OPT_NLINK" -a ${TYPE_LINK[0]} -gt 1 ]; then
120 echo -e "multiple hard links, skipped"
124 # working out write perms is hard, let the shell do it
125 if [ ! -w "$OLDNAME" ]; then
126 echo -e "no write permission, skipped"
130 if [ "$OPT_DRYRUN" ]; then
131 echo -e "dry run, skipped"
135 if [ "$OPT_RESTRIPE" ]; then
138 # if rsync copies Lustre xattrs properly in the future
139 # (i.e. before the file data, so that it preserves striping)
140 # then we don't need to do this getstripe/mktemp stuff.
143 [ "$OPT_STRIPE_COUNT" ] && COUNT=$OPT_STRIPE_COUNT ||
144 COUNT=$($LFS getstripe -c "$OLDNAME" \
146 SIZE=$($LFS getstripe $LFS_SIZE_OPT "$OLDNAME" \
149 [ -z "$COUNT" -o -z "$SIZE" ] && UNLINK=""
150 SIZE=${LFS_SIZE_OPT}${SIZE}
153 # first try to migrate inside lustre
154 # if failed go back to old rsync mode
155 if [[ $RSYNC_MODE == false ]]; then
156 if $LFS migrate -c${COUNT} ${SIZE} "$OLDNAME"; then
160 echo "falling back to rsync-based migration"
165 NEWNAME=$(mktemp $UNLINK "$OLDNAME.tmp.XXXXXX")
166 if [ $? -ne 0 -o -z "$NEWNAME" ]; then
167 echo -e "\r$OLDNAME: can't make temp file, skipped" 1>&2
171 [ "$UNLINK" ] && $LFS setstripe -c${COUNT} ${SIZE} "$NEWNAME"
173 # we use --inplace, since we created our own temp file already
174 if ! $RSYNC -a --inplace $RSYNC_OPTS "$OLDNAME" "$NEWNAME";then
175 echo -e "\r$OLDNAME: copy error, exiting" 1>&2
180 if [ "$OPT_CHECK" ] && ! cmp "$OLDNAME" "$NEWNAME"; then
181 echo -e "\r$NEWNAME: compare failed, exiting" 1>&2
185 if ! mv "$NEWNAME" "$OLDNAME"; then
186 echo -e "\r$OLDNAME: rename error, exiting" 1>&2
193 if [ "$#" -eq 0 ]; then
194 if [ "$OPT_NULL" ]; then
197 tr '\n' '\0' | lfs_migrate
202 lfs find "$1" -type f -print0 | lfs_migrate
204 echo -en "$1\0" | lfs_migrate