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/*
* C Implementation: rmdir
*
* Description: unionfs rmdir() call
* If the directory to remove exists in a lower branch, create a
* file with a tag informing other functions that the file
* is hidden.
*
* original implementation by Radek Podgorny
*
* License: BSD-style license
* Copyright: Radek Podgorny <radek@podgorny.cz>,
* Bernd Schubert <bernd-schubert@gmx.de>
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include <unistd.h>
#include <errno.h>
#include <libgen.h>
#include <sys/types.h>
#include <dirent.h>
#include "unionfs.h"
#include "opts.h"
#include "debug.h"
#include "cow.h"
#include "general.h"
#include "findbranch.h"
#include "string.h"
#include "readdir.h"
#include "usyslog.h"
/**
* If the branch that has the directory to be removed is in read-write mode,
* we can really delete the file.
*/
static int rmdir_rw(const char *path, int branch_rw) {
DBG("%s\n", path);
char p[PATHLEN_MAX];
if (BUILD_PATH(p, uopt.branches[branch_rw].path, path)) return ENAMETOOLONG;
int res = rmdir(p);
if (res == -1) return errno;
return 0;
}
/**
* If the branch that has the directory to be removed is in read-only mode,
* we create a file with a HIDE tag in an upper level branch.
* To other fuse functions this tag means, not to expose the
* lower level directory.
*/
static int rmdir_ro(const char *path, int branch_ro) {
DBG("%s\n", path);
// find a writable branch above branch_ro
int branch_rw = find_lowest_rw_branch(branch_ro);
if (branch_rw < 0) return -EACCES;
DBG("Calling hide_dir\n");
if (hide_dir(path, branch_rw) == -1) {
switch (errno) {
case (EEXIST):
case (ENOTDIR):
case (ENOTEMPTY):
// catch errors not allowed for rmdir()
USYSLOG (LOG_ERR, "%s: Creating the whiteout failed: %s\n",
__func__, strerror(errno));
errno = EFAULT;
}
return errno;
}
return 0;
}
/**
* rmdir() call
*/
int unionfs_rmdir(const char *path) {
DBG("%s\n", path);
if (dir_not_empty(path)) return -ENOTEMPTY;
int i = find_rorw_branch(path);
if (i == -1) return -errno;
int res;
if (!uopt.branches[i].rw) {
// read-only branch
if (!uopt.cow_enabled)
res = EROFS;
else
res = rmdir_ro(path, i);
} else {
// read-write branch
res = rmdir_rw(path, i);
if (res == 0) {
// No need to be root, whiteouts are created as root!
maybe_whiteout(path, i, WHITEOUT_DIR);
}
}
return -res;
}
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