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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <linux/btrfs.h>
#include <linux/magic.h>
#include <sys/ioctl.h>
#include <sys/vfs.h>
#include "blockdev-util.h"
#include "fs-util.h"
#include "missing_fs.h"
#include "missing_magic.h"
#include "missing_xfs.h"
#include "resize-fs.h"
#include "stat-util.h"
int resize_fs(int fd, uint64_t sz, uint64_t *ret_size) {
struct statfs sfs;
assert(fd >= 0);
/* Rounds down to next block size */
if (sz <= 0 || sz == UINT64_MAX)
return -ERANGE;
if (fstatfs(fd, &sfs) < 0)
return -errno;
if (is_fs_type(&sfs, EXT4_SUPER_MAGIC)) {
uint64_t u;
if (sz < EXT4_MINIMAL_SIZE)
return -ERANGE;
u = sz / sfs.f_bsize;
if (ioctl(fd, EXT4_IOC_RESIZE_FS, &u) < 0)
return -errno;
if (ret_size)
*ret_size = u * sfs.f_bsize;
} else if (is_fs_type(&sfs, BTRFS_SUPER_MAGIC)) {
struct btrfs_ioctl_vol_args args = {};
/* 256M is the minimize size enforced by the btrfs kernel code when resizing (which is
* strange btw, as mkfs.btrfs is fine creating file systems > 109M). It will return EINVAL in
* that case, let's catch this error beforehand though, and report a more explanatory
* error. */
if (sz < BTRFS_MINIMAL_SIZE)
return -ERANGE;
sz -= sz % sfs.f_bsize;
xsprintf(args.name, "%" PRIu64, sz);
if (ioctl(fd, BTRFS_IOC_RESIZE, &args) < 0)
return -errno;
if (ret_size)
*ret_size = sz;
} else if (is_fs_type(&sfs, XFS_SUPER_MAGIC)) {
xfs_fsop_geom_t geo;
xfs_growfs_data_t d;
if (sz < XFS_MINIMAL_SIZE)
return -ERANGE;
if (ioctl(fd, XFS_IOC_FSGEOMETRY, &geo) < 0)
return -errno;
d = (xfs_growfs_data_t) {
.imaxpct = geo.imaxpct,
.newblocks = sz / geo.blocksize,
};
if (ioctl(fd, XFS_IOC_FSGROWFSDATA, &d) < 0)
return -errno;
if (ret_size)
*ret_size = d.newblocks * geo.blocksize;
} else
return -EOPNOTSUPP;
return 0;
}
uint64_t minimal_size_by_fs_magic(statfs_f_type_t magic) {
switch (magic) {
case (statfs_f_type_t) EXT4_SUPER_MAGIC:
return EXT4_MINIMAL_SIZE;
case (statfs_f_type_t) XFS_SUPER_MAGIC:
return XFS_MINIMAL_SIZE;
case (statfs_f_type_t) BTRFS_SUPER_MAGIC:
return BTRFS_MINIMAL_SIZE;
default:
return UINT64_MAX;
}
}
uint64_t minimal_size_by_fs_name(const char *name) {
if (streq_ptr(name, "ext4"))
return EXT4_MINIMAL_SIZE;
if (streq_ptr(name, "xfs"))
return XFS_MINIMAL_SIZE;
if (streq_ptr(name, "btrfs"))
return BTRFS_MINIMAL_SIZE;
return UINT64_MAX;
}
/* Returns true for the only fs that can online shrink *and* grow */
bool fs_can_online_shrink_and_grow(statfs_f_type_t magic) {
return magic == (statfs_f_type_t) BTRFS_SUPER_MAGIC;
}
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