/**
* Mount a new fatfs.
* @param mode mount flags.
* @param param contains optional mount parameters.
* @param parm_len length of param string.
* @param[out] sb Returns the superblock of the new mount.
* @return error code, -errno.
*/
static int fatfs_mount(const char * source, uint32_t mode,
const char * parm, int parm_len,
struct fs_superblock ** sb)
{
static dev_t fatfs_vdev_minor;
struct fatfs_sb * fatfs_sb = NULL;
vnode_t * vndev;
char pdrv;
int err, retval = 0;
/* Get device vnode */
err = lookup_vnode(&vndev, curproc->croot, source, 0);
if (err) {
#ifdef configFATFS_DEBUG
KERROR(KERROR_DEBUG, "fatfs source not found\n");
#endif
return err;
}
if (!S_ISBLK(vndev->vn_mode))
return -ENOTBLK;
/* Allocate superblock */
fatfs_sb = kzalloc(sizeof(struct fatfs_sb));
if (!fatfs_sb)
return -ENOMEM;
fs_fildes_set(&fatfs_sb->ff_devfile, vndev, O_RDWR);
fatfs_sb->sb.vdev_id = DEV_MMTODEV(VDEV_MJNR_FATFS, fatfs_vdev_minor++);
/* Insert sb to fatfs_sb_arr lookup array */
fatfs_sb_arr[DEV_MINOR(fatfs_sb->sb.vdev_id)] = fatfs_sb;
/* Mount */
pdrv = (char)DEV_MINOR(fatfs_sb->sb.vdev_id);
err = f_mount(&fatfs_sb->ff_fs, 0);
if (err) {
#ifdef configFATFS_DEBUG
KERROR(KERROR_DEBUG, "Can't init a work area for FAT (%d)\n", err);
#endif
retval = fresult2errno(err);
goto fail;
}
#ifdef configFATFS_DEBUG
KERROR(KERROR_DEBUG, "Initialized a work area for FAT\n");
#endif
#if (_FS_NOFSINFO == 0) /* Commit full scan of free clusters */
DWORD nclst;
f_getfree(&fatfs_sb->ff_fs, &nclst);
#endif
/* Init super block */
fs_init_superblock(&fatfs_sb->sb, &fatfs_fs);
/* TODO Detect if target dev is rdonly */
fatfs_sb->sb.mode_flags = mode;
fatfs_sb->sb.root = create_root(fatfs_sb);
fatfs_sb->sb.sb_dev = vndev;
fatfs_sb->sb.sb_hashseed = fatfs_sb->sb.vdev_id;
/* Function pointers to superblock methods */
fatfs_sb->sb.get_vnode = NULL; /* Not implemented for FAT. */
fatfs_sb->sb.delete_vnode = fatfs_delete_vnode;
fatfs_sb->sb.umount = NULL;
if (!fatfs_sb->sb.root) {
KERROR(KERROR_ERR, "Root of fatfs not found\n");
return -EIO;
}
fs_insert_superblock(&fatfs_fs, &fatfs_sb->sb);
fail:
if (retval) {
fatfs_sb_arr[DEV_MINOR(fatfs_sb->sb.vdev_id)] = NULL;
kfree(fatfs_sb);
}
*sb = &fatfs_sb->sb;
return retval;
}
/* If we have a --backup-dir, then we get here from make_backup().
* We will move the file to be deleted into a parallel directory tree. */
static int keep_backup(const char *fname)
{
STRUCT_STAT st;
struct file_struct *file;
char *buf;
int kept = 0;
int ret_code;
/* return if no file to keep */
if (do_lstat(fname, &st) < 0)
return 1;
if (!(file = make_file(fname, NULL, NULL, 0, NO_FILTERS)))
return 1; /* the file could have disappeared */
if (!(buf = get_backup_name(fname))) {
unmake_file(file);
return 0;
}
/* Check to see if this is a device file, or link */
if ((am_root && preserve_devices && IS_DEVICE(file->mode))
|| (preserve_specials && IS_SPECIAL(file->mode))) {
uint32 *devp = F_RDEV_P(file);
dev_t rdev = MAKEDEV(DEV_MAJOR(devp), DEV_MINOR(devp));
do_unlink(buf);
if (do_mknod(buf, file->mode, rdev) < 0
&& (errno != ENOENT || make_bak_dir(buf) < 0
|| do_mknod(buf, file->mode, rdev) < 0)) {
rsyserr(FERROR, errno, "mknod %s failed",
full_fname(buf));
} else if (verbose > 2) {
rprintf(FINFO, "make_backup: DEVICE %s successful.\n",
fname);
}
kept = 1;
do_unlink(fname);
}
if (!kept && S_ISDIR(file->mode)) {
/* make an empty directory */
if (do_mkdir(buf, file->mode) < 0
&& (errno != ENOENT || make_bak_dir(buf) < 0
|| do_mkdir(buf, file->mode) < 0)) {
rsyserr(FINFO, errno, "mkdir %s failed",
full_fname(buf));
}
ret_code = do_rmdir(fname);
if (verbose > 2) {
rprintf(FINFO, "make_backup: RMDIR %s returns %i\n",
full_fname(fname), ret_code);
}
kept = 1;
}
#ifdef SUPPORT_LINKS
if (!kept && preserve_links && S_ISLNK(file->mode)) {
const char *sl = F_SYMLINK(file);
if (safe_symlinks && unsafe_symlink(sl, buf)) {
if (verbose) {
rprintf(FINFO, "ignoring unsafe symlink %s -> %s\n",
full_fname(buf), sl);
}
kept = 1;
} else {
do_unlink(buf);
if (do_symlink(sl, buf) < 0
&& (errno != ENOENT || make_bak_dir(buf) < 0
|| do_symlink(sl, buf) < 0)) {
rsyserr(FERROR, errno, "link %s -> \"%s\"",
full_fname(buf), sl);
}
do_unlink(fname);
kept = 1;
}
}
#endif
if (!kept && !S_ISREG(file->mode)) {
rprintf(FINFO, "make_bak: skipping non-regular file %s\n",
fname);
unmake_file(file);
return 1;
}
/* move to keep tree if a file */
if (!kept) {
if (robust_move(fname, buf) != 0) {
rsyserr(FERROR, errno, "keep_backup failed: %s -> \"%s\"",
full_fname(fname), buf);
} else if (st.st_nlink > 1) {
/* If someone has hard-linked the file into the backup
* dir, rename() might return success but do nothing! */
robust_unlink(fname); /* Just in case... */
}
}
set_file_attrs(buf, file, NULL, 0);
unmake_file(file);
if (verbose > 1) {
rprintf(FINFO, "backed up %s to %s\n",
fname, buf);
}
return 1;
}