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btrfs-progs: subvol: fix subvol del --commit-after

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Fix 'subvolume delete --commit-after' to work properly:
- SYNC ioctl will be issued even when last delete fails
- SYNC ioctl will be issued on each file system only once in the end

To achieve this, get_fsid() and add_seen_fsid() are called after each
delete to keep only one fd for each fs.

In the end, seen_fsid_hash will be traversed and SYNC is issued on each
fs.

Signed-off-by: Tomohiro Misono <misono.tomohiro@jp.fujitsu.com>
Reviewed-by: Qu Wenruo <quwenruo.btrfs@gmx.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Misono, Tomohiro 2017-09-27 11:03:48 +09:00 committed by David Sterba
parent 26908f6146
commit 8d93d71f6a
1 changed files with 59 additions and 13 deletions
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72
cmds-subvolume.c
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@ -263,6 +263,9 @@ static int cmd_subvol_delete(int argc, char **argv)
DIR *dirstream = NULL;
int verbose = 0;
int commit_mode = 0;
u8 fsid[BTRFS_FSID_SIZE];
char uuidbuf[BTRFS_UUID_UNPARSED_SIZE];
struct seen_fsid *seen_fsid_hash[SEEN_FSID_HASH_SIZE] = { NULL, };
enum { COMMIT_AFTER = 1, COMMIT_EACH = 2 };
while (1) {
@ -358,31 +361,74 @@ again:
path, strerror(errno));
ret = 1;
}
} else if (commit_mode == COMMIT_AFTER) {
res = get_fsid(dname, fsid, 0);
if (res < 0) {
error("unable to get fsid for '%s': %s",
path, strerror(-res));
error(
"delete suceeded but commit may not be done in the end");
ret = 1;
goto out;
}
if (add_seen_fsid(fsid, seen_fsid_hash, fd, dirstream) == 0) {
if (verbose > 0) {
uuid_unparse(fsid, uuidbuf);
printf(" new fs is found for '%s', fsid: %s\n",
path, uuidbuf);
}
/*
* This is the first time a subvolume on this
* filesystem is deleted, keep fd in order to issue
* SYNC ioctl in the end
*/
goto keep_fd;
}
}
out:
close_file_or_dir(fd, dirstream);
keep_fd:
fd = -1;
dirstream = NULL;
free(dupdname);
free(dupvname);
dupdname = NULL;
dupvname = NULL;
cnt++;
if (cnt < argc) {
close_file_or_dir(fd, dirstream);
/* avoid double free */
fd = -1;
dirstream = NULL;
if (cnt < argc)
goto again;
}
if (commit_mode == COMMIT_AFTER && fd != -1) {
res = wait_for_commit(fd);
if (res < 0) {
error("unable to do final sync after deletion: %s",
strerror(errno));
ret = 1;
if (commit_mode == COMMIT_AFTER) {
int slot;
/*
* Traverse seen_fsid_hash and issue SYNC ioctl on each
* filesystem
*/
for (slot = 0; slot < SEEN_FSID_HASH_SIZE; slot++) {
struct seen_fsid *seen = seen_fsid_hash[slot];
while (seen) {
res = wait_for_commit(seen->fd);
if (res < 0) {
uuid_unparse(seen->fsid, uuidbuf);
error(
"unable to do final sync after deletion: %s, fsid: %s",
strerror(errno), uuidbuf);
ret = 1;
} else if (verbose > 0) {
uuid_unparse(seen->fsid, uuidbuf);
printf("final sync is done for fsid: %s\n",
uuidbuf);
}
seen = seen->next;
}
}
/* fd will also be closed in free_seen_fsid */
free_seen_fsid(seen_fsid_hash);
}
close_file_or_dir(fd, dirstream);
return ret;
}