1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering

8bdbb8d9cbe1d35708385573d70984ab4533812dLennart Poettering#include <stdlib.h>

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering#include <sys/vfs.h>

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering#include <sys/stat.h>

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering#ifdef HAVE_LINUX_BTRFS_H

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering#include <linux/btrfs.h>

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering#endif

04d39279245834494baccfdb9349db8bf80abd13Lennart Poettering

878cd7e95ca303f9851d227a22d2022bd49944b0Lennart Poettering#include "missing.h"

878cd7e95ca303f9851d227a22d2022bd49944b0Lennart Poettering#include "util.h"

f48e75cb9a8112d35855c44a156934f2ee0edb2eLennart Poettering#include "path-util.h"

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering#include "macro.h"

a1da85830bfaa77b9eb9c54693e5573559c97e50Tom Gundersen#include "strv.h"

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering#include "copy.h"

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering#include "selinux-util.h"

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering#include "smack-util.h"

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering#include "btrfs-ctree.h"

a1da85830bfaa77b9eb9c54693e5573559c97e50Tom Gundersen#include "btrfs-util.h"

a1da85830bfaa77b9eb9c54693e5573559c97e50Tom Gundersen

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poetteringstatic int validate_subvolume_name(const char *name) {

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering

aa1936ea1a89c2bb968ba33e3274898a4eeae771Lennart Poettering if (!filename_is_valid(name))

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering return -EINVAL;

9d12709626bccc0cae677a7035f62efe6aabb4abLennart Poettering

04d39279245834494baccfdb9349db8bf80abd13Lennart Poettering if (strlen(name) > BTRFS_SUBVOL_NAME_MAX)

023fb90b83871a15ef7f57e8cd126e3426f99b9eLennart Poettering return -E2BIG;

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering return 0;

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering}

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poetteringstatic int open_parent(const char *path, int flags) {

e56056e93d33619a3acf13e483900b4f8938228fThomas Hindoe Paaboel Andersen _cleanup_free_ char *parent = NULL;

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering int r, fd;

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering

d21ed1ead18d16d35c30299a69d3366847f8a039Lennart Poettering assert(path);

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering r = path_get_parent(path, &parent);

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering if (r < 0)

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering return r;

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering fd = open(parent, flags);

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering if (fd < 0)

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering return -errno;

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering return fd;

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering}

a1da85830bfaa77b9eb9c54693e5573559c97e50Tom Gundersen

a1da85830bfaa77b9eb9c54693e5573559c97e50Tom Gundersenstatic int extract_subvolume_name(const char *path, const char **subvolume) {

a1da85830bfaa77b9eb9c54693e5573559c97e50Tom Gundersen const char *fn;

a1da85830bfaa77b9eb9c54693e5573559c97e50Tom Gundersen int r;

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering assert(path);

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering assert(subvolume);

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering fn = basename(path);

a1da85830bfaa77b9eb9c54693e5573559c97e50Tom Gundersen

a1da85830bfaa77b9eb9c54693e5573559c97e50Tom Gundersen r = validate_subvolume_name(fn);

a1da85830bfaa77b9eb9c54693e5573559c97e50Tom Gundersen if (r < 0)

a1da85830bfaa77b9eb9c54693e5573559c97e50Tom Gundersen return r;

a1da85830bfaa77b9eb9c54693e5573559c97e50Tom Gundersen

a1da85830bfaa77b9eb9c54693e5573559c97e50Tom Gundersen *subvolume = fn;

a1da85830bfaa77b9eb9c54693e5573559c97e50Tom Gundersen return 0;

a1da85830bfaa77b9eb9c54693e5573559c97e50Tom Gundersen}

a1da85830bfaa77b9eb9c54693e5573559c97e50Tom Gundersen

a1da85830bfaa77b9eb9c54693e5573559c97e50Tom Gundersenint btrfs_is_snapshot(int fd) {

a1da85830bfaa77b9eb9c54693e5573559c97e50Tom Gundersen struct stat st;

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering struct statfs sfs;

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering /* On btrfs subvolumes always have the inode 256 */

e56056e93d33619a3acf13e483900b4f8938228fThomas Hindoe Paaboel Andersen

e56056e93d33619a3acf13e483900b4f8938228fThomas Hindoe Paaboel Andersen if (fstat(fd, &st) < 0)

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering return -errno;

a1da85830bfaa77b9eb9c54693e5573559c97e50Tom Gundersen

a1da85830bfaa77b9eb9c54693e5573559c97e50Tom Gundersen if (!S_ISDIR(st.st_mode) || st.st_ino != 256)

5b30bef856e89a571df57b7b953e9a1409d9acedLennart Poettering return 0;

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering

a1da85830bfaa77b9eb9c54693e5573559c97e50Tom Gundersen if (fstatfs(fd, &sfs) < 0)

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering return -errno;

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering return F_TYPE_EQUAL(sfs.f_type, BTRFS_SUPER_MAGIC);

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering}

a1da85830bfaa77b9eb9c54693e5573559c97e50Tom Gundersen

5b30bef856e89a571df57b7b953e9a1409d9acedLennart Poetteringint btrfs_subvol_snapshot(const char *old_path, const char *new_path, bool read_only, bool fallback_copy) {

a1da85830bfaa77b9eb9c54693e5573559c97e50Tom Gundersen struct btrfs_ioctl_vol_args_v2 args = {

a1da85830bfaa77b9eb9c54693e5573559c97e50Tom Gundersen .flags = read_only ? BTRFS_SUBVOL_RDONLY : 0,

a1da85830bfaa77b9eb9c54693e5573559c97e50Tom Gundersen };

5b30bef856e89a571df57b7b953e9a1409d9acedLennart Poettering _cleanup_close_ int old_fd = -1, new_fd = -1;

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering const char *subvolume;

e56056e93d33619a3acf13e483900b4f8938228fThomas Hindoe Paaboel Andersen int r;

e56056e93d33619a3acf13e483900b4f8938228fThomas Hindoe Paaboel Andersen

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering assert(old_path);

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering old_fd = open(old_path, O_RDONLY|O_NOCTTY|O_CLOEXEC|O_DIRECTORY);

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering if (old_fd < 0)

89f7c8465cd1ab37347dd0c15920bce31e8225dfLennart Poettering return -errno;

a1da85830bfaa77b9eb9c54693e5573559c97e50Tom Gundersen

a1da85830bfaa77b9eb9c54693e5573559c97e50Tom Gundersen r = btrfs_is_snapshot(old_fd);

aa1936ea1a89c2bb968ba33e3274898a4eeae771Lennart Poettering if (r < 0)

aa1936ea1a89c2bb968ba33e3274898a4eeae771Lennart Poettering return r;

aa1936ea1a89c2bb968ba33e3274898a4eeae771Lennart Poettering if (r == 0) {

aa1936ea1a89c2bb968ba33e3274898a4eeae771Lennart Poettering

aa1936ea1a89c2bb968ba33e3274898a4eeae771Lennart Poettering if (fallback_copy) {

aa1936ea1a89c2bb968ba33e3274898a4eeae771Lennart Poettering r = btrfs_subvol_make(new_path);

aa1936ea1a89c2bb968ba33e3274898a4eeae771Lennart Poettering if (r < 0)

aa1936ea1a89c2bb968ba33e3274898a4eeae771Lennart Poettering return r;

d21ed1ead18d16d35c30299a69d3366847f8a039Lennart Poettering

aa1936ea1a89c2bb968ba33e3274898a4eeae771Lennart Poettering r = copy_directory_fd(old_fd, new_path, true);

aa1936ea1a89c2bb968ba33e3274898a4eeae771Lennart Poettering if (r < 0) {

aa1936ea1a89c2bb968ba33e3274898a4eeae771Lennart Poettering btrfs_subvol_remove(new_path);

aa1936ea1a89c2bb968ba33e3274898a4eeae771Lennart Poettering return r;

aa1936ea1a89c2bb968ba33e3274898a4eeae771Lennart Poettering }

aa1936ea1a89c2bb968ba33e3274898a4eeae771Lennart Poettering

a7893c6b28772edbc7e1fea3c209caa54d465648Lennart Poettering if (read_only) {

aa1936ea1a89c2bb968ba33e3274898a4eeae771Lennart Poettering r = btrfs_subvol_set_read_only(new_path, true);

aa1936ea1a89c2bb968ba33e3274898a4eeae771Lennart Poettering if (r < 0) {

aa1936ea1a89c2bb968ba33e3274898a4eeae771Lennart Poettering btrfs_subvol_remove(new_path);

89f7c8465cd1ab37347dd0c15920bce31e8225dfLennart Poettering return r;

a7893c6b28772edbc7e1fea3c209caa54d465648Lennart Poettering }

aa1936ea1a89c2bb968ba33e3274898a4eeae771Lennart Poettering }

a1da85830bfaa77b9eb9c54693e5573559c97e50Tom Gundersen

a7893c6b28772edbc7e1fea3c209caa54d465648Lennart Poettering return 0;

aa1936ea1a89c2bb968ba33e3274898a4eeae771Lennart Poettering }

a1da85830bfaa77b9eb9c54693e5573559c97e50Tom Gundersen

aa1936ea1a89c2bb968ba33e3274898a4eeae771Lennart Poettering return -EISDIR;

aa1936ea1a89c2bb968ba33e3274898a4eeae771Lennart Poettering }

aa1936ea1a89c2bb968ba33e3274898a4eeae771Lennart Poettering

a7893c6b28772edbc7e1fea3c209caa54d465648Lennart Poettering r = extract_subvolume_name(new_path, &subvolume);

5b30bef856e89a571df57b7b953e9a1409d9acedLennart Poettering if (r < 0)

5b30bef856e89a571df57b7b953e9a1409d9acedLennart Poettering return r;

aa1936ea1a89c2bb968ba33e3274898a4eeae771Lennart Poettering

9d12709626bccc0cae677a7035f62efe6aabb4abLennart Poettering new_fd = open_parent(new_path, O_RDONLY|O_NOCTTY|O_CLOEXEC|O_DIRECTORY);

9d12709626bccc0cae677a7035f62efe6aabb4abLennart Poettering if (new_fd < 0)

9d12709626bccc0cae677a7035f62efe6aabb4abLennart Poettering return new_fd;

9d12709626bccc0cae677a7035f62efe6aabb4abLennart Poettering

9d12709626bccc0cae677a7035f62efe6aabb4abLennart Poettering strncpy(args.name, subvolume, sizeof(args.name)-1);

9d12709626bccc0cae677a7035f62efe6aabb4abLennart Poettering args.fd = old_fd;

aa1936ea1a89c2bb968ba33e3274898a4eeae771Lennart Poettering

aa1936ea1a89c2bb968ba33e3274898a4eeae771Lennart Poettering if (ioctl(new_fd, BTRFS_IOC_SNAP_CREATE_V2, &args) < 0)

aa1936ea1a89c2bb968ba33e3274898a4eeae771Lennart Poettering return -errno;

aa1936ea1a89c2bb968ba33e3274898a4eeae771Lennart Poettering

aa1936ea1a89c2bb968ba33e3274898a4eeae771Lennart Poettering return 0;

aa1936ea1a89c2bb968ba33e3274898a4eeae771Lennart Poettering}

aa1936ea1a89c2bb968ba33e3274898a4eeae771Lennart Poettering

aa1936ea1a89c2bb968ba33e3274898a4eeae771Lennart Poetteringint btrfs_subvol_make(const char *path) {

aa1936ea1a89c2bb968ba33e3274898a4eeae771Lennart Poettering struct btrfs_ioctl_vol_args args = {};

aa1936ea1a89c2bb968ba33e3274898a4eeae771Lennart Poettering _cleanup_close_ int fd = -1;

9d12709626bccc0cae677a7035f62efe6aabb4abLennart Poettering const char *subvolume;

aa1936ea1a89c2bb968ba33e3274898a4eeae771Lennart Poettering int r;

aa1936ea1a89c2bb968ba33e3274898a4eeae771Lennart Poettering

aa1936ea1a89c2bb968ba33e3274898a4eeae771Lennart Poettering assert(path);

f48e75cb9a8112d35855c44a156934f2ee0edb2eLennart Poettering

878cd7e95ca303f9851d227a22d2022bd49944b0Lennart Poettering r = extract_subvolume_name(path, &subvolume);

878cd7e95ca303f9851d227a22d2022bd49944b0Lennart Poettering if (r < 0)

878cd7e95ca303f9851d227a22d2022bd49944b0Lennart Poettering return r;

878cd7e95ca303f9851d227a22d2022bd49944b0Lennart Poettering

878cd7e95ca303f9851d227a22d2022bd49944b0Lennart Poettering fd = open_parent(path, O_RDONLY|O_NOCTTY|O_CLOEXEC|O_DIRECTORY);

878cd7e95ca303f9851d227a22d2022bd49944b0Lennart Poettering if (fd < 0)

878cd7e95ca303f9851d227a22d2022bd49944b0Lennart Poettering return fd;

878cd7e95ca303f9851d227a22d2022bd49944b0Lennart Poettering

878cd7e95ca303f9851d227a22d2022bd49944b0Lennart Poettering strncpy(args.name, subvolume, sizeof(args.name)-1);

878cd7e95ca303f9851d227a22d2022bd49944b0Lennart Poettering

878cd7e95ca303f9851d227a22d2022bd49944b0Lennart Poettering if (ioctl(fd, BTRFS_IOC_SUBVOL_CREATE, &args) < 0)

878cd7e95ca303f9851d227a22d2022bd49944b0Lennart Poettering return -errno;

878cd7e95ca303f9851d227a22d2022bd49944b0Lennart Poettering

878cd7e95ca303f9851d227a22d2022bd49944b0Lennart Poettering return 0;

878cd7e95ca303f9851d227a22d2022bd49944b0Lennart Poettering}

878cd7e95ca303f9851d227a22d2022bd49944b0Lennart Poettering

878cd7e95ca303f9851d227a22d2022bd49944b0Lennart Poetteringint btrfs_subvol_make_label(const char *path) {

878cd7e95ca303f9851d227a22d2022bd49944b0Lennart Poettering int r;

878cd7e95ca303f9851d227a22d2022bd49944b0Lennart Poettering

0dd25fb9f005d8ab7ac4bc10a609d00569f8c56aLennart Poettering assert(path);

878cd7e95ca303f9851d227a22d2022bd49944b0Lennart Poettering

878cd7e95ca303f9851d227a22d2022bd49944b0Lennart Poettering r = mac_selinux_create_file_prepare(path, S_IFDIR);

878cd7e95ca303f9851d227a22d2022bd49944b0Lennart Poettering if (r < 0)

0dd25fb9f005d8ab7ac4bc10a609d00569f8c56aLennart Poettering return r;

0dd25fb9f005d8ab7ac4bc10a609d00569f8c56aLennart Poettering

878cd7e95ca303f9851d227a22d2022bd49944b0Lennart Poettering r = btrfs_subvol_make(path);

878cd7e95ca303f9851d227a22d2022bd49944b0Lennart Poettering mac_selinux_create_file_clear();

878cd7e95ca303f9851d227a22d2022bd49944b0Lennart Poettering

878cd7e95ca303f9851d227a22d2022bd49944b0Lennart Poettering if (r < 0)

0dd25fb9f005d8ab7ac4bc10a609d00569f8c56aLennart Poettering return r;

878cd7e95ca303f9851d227a22d2022bd49944b0Lennart Poettering

878cd7e95ca303f9851d227a22d2022bd49944b0Lennart Poettering return mac_smack_fix(path, false, false);

878cd7e95ca303f9851d227a22d2022bd49944b0Lennart Poettering}

878cd7e95ca303f9851d227a22d2022bd49944b0Lennart Poettering

878cd7e95ca303f9851d227a22d2022bd49944b0Lennart Poetteringint btrfs_subvol_remove(const char *path) {

878cd7e95ca303f9851d227a22d2022bd49944b0Lennart Poettering struct btrfs_ioctl_vol_args args = {};

878cd7e95ca303f9851d227a22d2022bd49944b0Lennart Poettering _cleanup_close_ int fd = -1;

f48e75cb9a8112d35855c44a156934f2ee0edb2eLennart Poettering const char *subvolume;

f48e75cb9a8112d35855c44a156934f2ee0edb2eLennart Poettering int r;

f48e75cb9a8112d35855c44a156934f2ee0edb2eLennart Poettering

f48e75cb9a8112d35855c44a156934f2ee0edb2eLennart Poettering assert(path);

f48e75cb9a8112d35855c44a156934f2ee0edb2eLennart Poettering

878cd7e95ca303f9851d227a22d2022bd49944b0Lennart Poettering r = extract_subvolume_name(path, &subvolume);

878cd7e95ca303f9851d227a22d2022bd49944b0Lennart Poettering if (r < 0)

878cd7e95ca303f9851d227a22d2022bd49944b0Lennart Poettering return r;

878cd7e95ca303f9851d227a22d2022bd49944b0Lennart Poettering

878cd7e95ca303f9851d227a22d2022bd49944b0Lennart Poettering fd = open_parent(path, O_RDONLY|O_NOCTTY|O_CLOEXEC|O_DIRECTORY);

878cd7e95ca303f9851d227a22d2022bd49944b0Lennart Poettering if (fd < 0)

878cd7e95ca303f9851d227a22d2022bd49944b0Lennart Poettering return fd;

878cd7e95ca303f9851d227a22d2022bd49944b0Lennart Poettering

878cd7e95ca303f9851d227a22d2022bd49944b0Lennart Poettering strncpy(args.name, subvolume, sizeof(args.name)-1);

878cd7e95ca303f9851d227a22d2022bd49944b0Lennart Poettering

878cd7e95ca303f9851d227a22d2022bd49944b0Lennart Poettering if (ioctl(fd, BTRFS_IOC_SNAP_DESTROY, &args) < 0)

878cd7e95ca303f9851d227a22d2022bd49944b0Lennart Poettering return -errno;

878cd7e95ca303f9851d227a22d2022bd49944b0Lennart Poettering

878cd7e95ca303f9851d227a22d2022bd49944b0Lennart Poettering return 0;

878cd7e95ca303f9851d227a22d2022bd49944b0Lennart Poettering}

878cd7e95ca303f9851d227a22d2022bd49944b0Lennart Poettering

878cd7e95ca303f9851d227a22d2022bd49944b0Lennart Poetteringint btrfs_subvol_set_read_only(const char *path, bool b) {

878cd7e95ca303f9851d227a22d2022bd49944b0Lennart Poettering _cleanup_close_ int fd = -1;

717603e391b52983ca1fd218e7333a1b9dfc5c05Lennart Poettering uint64_t flags, nflags;

717603e391b52983ca1fd218e7333a1b9dfc5c05Lennart Poettering

717603e391b52983ca1fd218e7333a1b9dfc5c05Lennart Poettering fd = open(path, O_RDONLY|O_NOCTTY|O_CLOEXEC);

717603e391b52983ca1fd218e7333a1b9dfc5c05Lennart Poettering if (fd < 0)

717603e391b52983ca1fd218e7333a1b9dfc5c05Lennart Poettering return -errno;

717603e391b52983ca1fd218e7333a1b9dfc5c05Lennart Poettering

717603e391b52983ca1fd218e7333a1b9dfc5c05Lennart Poettering if (ioctl(fd, BTRFS_IOC_SUBVOL_GETFLAGS, &flags) < 0)

717603e391b52983ca1fd218e7333a1b9dfc5c05Lennart Poettering return -errno;

717603e391b52983ca1fd218e7333a1b9dfc5c05Lennart Poettering

717603e391b52983ca1fd218e7333a1b9dfc5c05Lennart Poettering if (b)

717603e391b52983ca1fd218e7333a1b9dfc5c05Lennart Poettering nflags = flags | BTRFS_SUBVOL_RDONLY;

717603e391b52983ca1fd218e7333a1b9dfc5c05Lennart Poettering else

717603e391b52983ca1fd218e7333a1b9dfc5c05Lennart Poettering nflags = flags & ~BTRFS_SUBVOL_RDONLY;

717603e391b52983ca1fd218e7333a1b9dfc5c05Lennart Poettering

717603e391b52983ca1fd218e7333a1b9dfc5c05Lennart Poettering if (flags == nflags)

717603e391b52983ca1fd218e7333a1b9dfc5c05Lennart Poettering return 0;

717603e391b52983ca1fd218e7333a1b9dfc5c05Lennart Poettering

717603e391b52983ca1fd218e7333a1b9dfc5c05Lennart Poettering if (ioctl(fd, BTRFS_IOC_SUBVOL_SETFLAGS, &nflags) < 0)

717603e391b52983ca1fd218e7333a1b9dfc5c05Lennart Poettering return -errno;

717603e391b52983ca1fd218e7333a1b9dfc5c05Lennart Poettering

717603e391b52983ca1fd218e7333a1b9dfc5c05Lennart Poettering return 0;

717603e391b52983ca1fd218e7333a1b9dfc5c05Lennart Poettering}

717603e391b52983ca1fd218e7333a1b9dfc5c05Lennart Poettering

717603e391b52983ca1fd218e7333a1b9dfc5c05Lennart Poetteringint btrfs_subvol_get_read_only_fd(int fd) {

717603e391b52983ca1fd218e7333a1b9dfc5c05Lennart Poettering uint64_t flags;

717603e391b52983ca1fd218e7333a1b9dfc5c05Lennart Poettering

717603e391b52983ca1fd218e7333a1b9dfc5c05Lennart Poettering if (ioctl(fd, BTRFS_IOC_SUBVOL_GETFLAGS, &flags) < 0)

717603e391b52983ca1fd218e7333a1b9dfc5c05Lennart Poettering return -errno;

717603e391b52983ca1fd218e7333a1b9dfc5c05Lennart Poettering

717603e391b52983ca1fd218e7333a1b9dfc5c05Lennart Poettering return !!(flags & BTRFS_SUBVOL_RDONLY);

717603e391b52983ca1fd218e7333a1b9dfc5c05Lennart Poettering}

717603e391b52983ca1fd218e7333a1b9dfc5c05Lennart Poettering

717603e391b52983ca1fd218e7333a1b9dfc5c05Lennart Poetteringint btrfs_reflink(int infd, int outfd) {

717603e391b52983ca1fd218e7333a1b9dfc5c05Lennart Poettering int r;

717603e391b52983ca1fd218e7333a1b9dfc5c05Lennart Poettering

717603e391b52983ca1fd218e7333a1b9dfc5c05Lennart Poettering assert(infd >= 0);

717603e391b52983ca1fd218e7333a1b9dfc5c05Lennart Poettering assert(outfd >= 0);

717603e391b52983ca1fd218e7333a1b9dfc5c05Lennart Poettering

717603e391b52983ca1fd218e7333a1b9dfc5c05Lennart Poettering r = ioctl(outfd, BTRFS_IOC_CLONE, infd);

717603e391b52983ca1fd218e7333a1b9dfc5c05Lennart Poettering if (r < 0)

717603e391b52983ca1fd218e7333a1b9dfc5c05Lennart Poettering return -errno;

717603e391b52983ca1fd218e7333a1b9dfc5c05Lennart Poettering

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering return 0;

9f6eb1cd58f2ddf2eb6ba0e4de056e13d938af75Kay Sievers}

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering

9f6eb1cd58f2ddf2eb6ba0e4de056e13d938af75Kay Sieversint btrfs_clone_range(int infd, uint64_t in_offset, int outfd, uint64_t out_offset, uint64_t sz) {

9f6eb1cd58f2ddf2eb6ba0e4de056e13d938af75Kay Sievers struct btrfs_ioctl_clone_range_args args = {

89f7c8465cd1ab37347dd0c15920bce31e8225dfLennart Poettering .src_fd = infd,

9f6eb1cd58f2ddf2eb6ba0e4de056e13d938af75Kay Sievers .src_offset = in_offset,

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering .src_length = sz,

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering .dest_offset = out_offset,

f48e75cb9a8112d35855c44a156934f2ee0edb2eLennart Poettering };

f48e75cb9a8112d35855c44a156934f2ee0edb2eLennart Poettering int r;

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering assert(infd >= 0);

a1da85830bfaa77b9eb9c54693e5573559c97e50Tom Gundersen assert(outfd >= 0);

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering assert(sz > 0);

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering

f48e75cb9a8112d35855c44a156934f2ee0edb2eLennart Poettering r = ioctl(outfd, BTRFS_IOC_CLONE_RANGE, &args);

f48e75cb9a8112d35855c44a156934f2ee0edb2eLennart Poettering if (r < 0)

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering return -errno;

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering return 0;

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering}

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poetteringint btrfs_get_block_device(const char *path, dev_t *dev) {

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering struct btrfs_ioctl_fs_info_args fsi = {};

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering _cleanup_close_ int fd = -1;

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering uint64_t id;

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering assert(path);

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering assert(dev);

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering fd = open(path, O_RDONLY|O_NOCTTY|O_CLOEXEC|O_DIRECTORY);

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering if (fd < 0)

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering return -errno;

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering if (ioctl(fd, BTRFS_IOC_FS_INFO, &fsi) < 0)

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering return -errno;

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering /* We won't do this for btrfs RAID */

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering if (fsi.num_devices != 1)

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering return 0;

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering for (id = 1; id <= fsi.max_id; id++) {

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering struct btrfs_ioctl_dev_info_args di = {

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering .devid = id,

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering };

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering struct stat st;

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering if (ioctl(fd, BTRFS_IOC_DEV_INFO, &di) < 0) {

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering if (errno == ENODEV)

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering continue;

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering return -errno;

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering }

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering if (stat((char*) di.path, &st) < 0)

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering return -errno;

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering if (!S_ISBLK(st.st_mode))

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering return -ENODEV;

f48e75cb9a8112d35855c44a156934f2ee0edb2eLennart Poettering

f48e75cb9a8112d35855c44a156934f2ee0edb2eLennart Poettering if (major(st.st_rdev) == 0)

f48e75cb9a8112d35855c44a156934f2ee0edb2eLennart Poettering return -ENODEV;

f48e75cb9a8112d35855c44a156934f2ee0edb2eLennart Poettering

f48e75cb9a8112d35855c44a156934f2ee0edb2eLennart Poettering *dev = st.st_rdev;

f48e75cb9a8112d35855c44a156934f2ee0edb2eLennart Poettering return 1;

f48e75cb9a8112d35855c44a156934f2ee0edb2eLennart Poettering }

f48e75cb9a8112d35855c44a156934f2ee0edb2eLennart Poettering

f48e75cb9a8112d35855c44a156934f2ee0edb2eLennart Poettering return -ENODEV;

f48e75cb9a8112d35855c44a156934f2ee0edb2eLennart Poettering}

f48e75cb9a8112d35855c44a156934f2ee0edb2eLennart Poettering

f48e75cb9a8112d35855c44a156934f2ee0edb2eLennart Poetteringint btrfs_subvol_get_id_fd(int fd, uint64_t *ret) {

f48e75cb9a8112d35855c44a156934f2ee0edb2eLennart Poettering struct btrfs_ioctl_ino_lookup_args args = {

f48e75cb9a8112d35855c44a156934f2ee0edb2eLennart Poettering .objectid = BTRFS_FIRST_FREE_OBJECTID

f48e75cb9a8112d35855c44a156934f2ee0edb2eLennart Poettering };

f48e75cb9a8112d35855c44a156934f2ee0edb2eLennart Poettering

f48e75cb9a8112d35855c44a156934f2ee0edb2eLennart Poettering assert(fd >= 0);

f48e75cb9a8112d35855c44a156934f2ee0edb2eLennart Poettering assert(ret);

f48e75cb9a8112d35855c44a156934f2ee0edb2eLennart Poettering

f48e75cb9a8112d35855c44a156934f2ee0edb2eLennart Poettering if (ioctl(fd, BTRFS_IOC_INO_LOOKUP, &args) < 0)

f48e75cb9a8112d35855c44a156934f2ee0edb2eLennart Poettering return -errno;

f48e75cb9a8112d35855c44a156934f2ee0edb2eLennart Poettering

f48e75cb9a8112d35855c44a156934f2ee0edb2eLennart Poettering *ret = args.treeid;

f48e75cb9a8112d35855c44a156934f2ee0edb2eLennart Poettering return 0;

878cd7e95ca303f9851d227a22d2022bd49944b0Lennart Poettering}

878cd7e95ca303f9851d227a22d2022bd49944b0Lennart Poettering

878cd7e95ca303f9851d227a22d2022bd49944b0Lennart Poetteringstatic bool btrfs_ioctl_search_args_inc(struct btrfs_ioctl_search_args *args) {

717603e391b52983ca1fd218e7333a1b9dfc5c05Lennart Poettering assert(args);

717603e391b52983ca1fd218e7333a1b9dfc5c05Lennart Poettering

89f7c8465cd1ab37347dd0c15920bce31e8225dfLennart Poettering /* the objectid, type, offset together make up the btrfs key,

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering if (args->key.min_offset < (uint64_t) -1) {

f48e75cb9a8112d35855c44a156934f2ee0edb2eLennart Poettering args->key.min_offset++;

f48e75cb9a8112d35855c44a156934f2ee0edb2eLennart Poettering return true;

f48e75cb9a8112d35855c44a156934f2ee0edb2eLennart Poettering }

f48e75cb9a8112d35855c44a156934f2ee0edb2eLennart Poettering

f48e75cb9a8112d35855c44a156934f2ee0edb2eLennart Poettering if (args->key.min_type < (uint8_t) -1) {

f48e75cb9a8112d35855c44a156934f2ee0edb2eLennart Poettering args->key.min_type++;

f48e75cb9a8112d35855c44a156934f2ee0edb2eLennart Poettering args->key.min_offset = 0;

f48e75cb9a8112d35855c44a156934f2ee0edb2eLennart Poettering return true;

f48e75cb9a8112d35855c44a156934f2ee0edb2eLennart Poettering }

f48e75cb9a8112d35855c44a156934f2ee0edb2eLennart Poettering

e7e9b6bb0b0bc5b1eb256a44f8afec6b634f26efZbigniew Jędrzejewski-Szmek if (args->key.min_objectid < (uint64_t) -1) {

e7e9b6bb0b0bc5b1eb256a44f8afec6b634f26efZbigniew Jędrzejewski-Szmek args->key.min_objectid++;

f48e75cb9a8112d35855c44a156934f2ee0edb2eLennart Poettering args->key.min_offset = 0;

f48e75cb9a8112d35855c44a156934f2ee0edb2eLennart Poettering args->key.min_type = 0;

f48e75cb9a8112d35855c44a156934f2ee0edb2eLennart Poettering return true;

f48e75cb9a8112d35855c44a156934f2ee0edb2eLennart Poettering }

f48e75cb9a8112d35855c44a156934f2ee0edb2eLennart Poettering

f48e75cb9a8112d35855c44a156934f2ee0edb2eLennart Poettering return 0;

f48e75cb9a8112d35855c44a156934f2ee0edb2eLennart Poettering}

f48e75cb9a8112d35855c44a156934f2ee0edb2eLennart Poettering

f48e75cb9a8112d35855c44a156934f2ee0edb2eLennart Poetteringstatic void btrfs_ioctl_search_args_set(struct btrfs_ioctl_search_args *args, const struct btrfs_ioctl_search_header *h) {

9f6eb1cd58f2ddf2eb6ba0e4de056e13d938af75Kay Sievers assert(args);

a6c616024db23fef34152c1432892824a07799ccLennart Poettering assert(h);

9f6eb1cd58f2ddf2eb6ba0e4de056e13d938af75Kay Sievers

f48e75cb9a8112d35855c44a156934f2ee0edb2eLennart Poettering args->key.min_objectid = h->objectid;

f48e75cb9a8112d35855c44a156934f2ee0edb2eLennart Poettering args->key.min_type = h->type;

f48e75cb9a8112d35855c44a156934f2ee0edb2eLennart Poettering args->key.min_offset = h->offset;

f48e75cb9a8112d35855c44a156934f2ee0edb2eLennart Poettering}

f48e75cb9a8112d35855c44a156934f2ee0edb2eLennart Poettering

f48e75cb9a8112d35855c44a156934f2ee0edb2eLennart Poetteringstatic int btrfs_ioctl_search_args_compare(const struct btrfs_ioctl_search_args *args) {

f48e75cb9a8112d35855c44a156934f2ee0edb2eLennart Poettering assert(args);

f48e75cb9a8112d35855c44a156934f2ee0edb2eLennart Poettering

f48e75cb9a8112d35855c44a156934f2ee0edb2eLennart Poettering /* Compare min and max */

9f6eb1cd58f2ddf2eb6ba0e4de056e13d938af75Kay Sievers

9f6eb1cd58f2ddf2eb6ba0e4de056e13d938af75Kay Sievers if (args->key.min_objectid < args->key.max_objectid)

a6c616024db23fef34152c1432892824a07799ccLennart Poettering return -1;

a6c616024db23fef34152c1432892824a07799ccLennart Poettering if (args->key.min_objectid > args->key.max_objectid)

a1da85830bfaa77b9eb9c54693e5573559c97e50Tom Gundersen return 1;

a1da85830bfaa77b9eb9c54693e5573559c97e50Tom Gundersen

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering if (args->key.min_type < args->key.max_type)

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering return -1;

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering if (args->key.min_type > args->key.max_type)

9f6eb1cd58f2ddf2eb6ba0e4de056e13d938af75Kay Sievers return 1;

9f6eb1cd58f2ddf2eb6ba0e4de056e13d938af75Kay Sievers

9f6eb1cd58f2ddf2eb6ba0e4de056e13d938af75Kay Sievers if (args->key.min_offset < args->key.max_offset)

9f6eb1cd58f2ddf2eb6ba0e4de056e13d938af75Kay Sievers return -1;

9f6eb1cd58f2ddf2eb6ba0e4de056e13d938af75Kay Sievers if (args->key.min_offset > args->key.max_offset)

a1da85830bfaa77b9eb9c54693e5573559c97e50Tom Gundersen return 1;

da927ba997d68401563b927f92e6e40e021a8e5cMichal Schmidt

a1da85830bfaa77b9eb9c54693e5573559c97e50Tom Gundersen return 0;

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering}

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering#define FOREACH_BTRFS_IOCTL_SEARCH_HEADER(i, sh, args) \

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering for ((i) = 0, \

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering (sh) = (const struct btrfs_ioctl_search_header*) (args).buf; \

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering (i) < (args).key.nr_items; \

9f6eb1cd58f2ddf2eb6ba0e4de056e13d938af75Kay Sievers (i)++, \

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering (sh) = (const struct btrfs_ioctl_search_header*) ((uint8_t*) (sh) + sizeof(struct btrfs_ioctl_search_header) + (sh)->len))

9f6eb1cd58f2ddf2eb6ba0e4de056e13d938af75Kay Sievers

9f6eb1cd58f2ddf2eb6ba0e4de056e13d938af75Kay Sievers#define BTRFS_IOCTL_SEARCH_HEADER_BODY(sh) \

9f6eb1cd58f2ddf2eb6ba0e4de056e13d938af75Kay Sievers ((void*) ((uint8_t*) sh + sizeof(struct btrfs_ioctl_search_header)))

89f7c8465cd1ab37347dd0c15920bce31e8225dfLennart Poettering

9f6eb1cd58f2ddf2eb6ba0e4de056e13d938af75Kay Sieversint btrfs_subvol_get_info_fd(int fd, BtrfsSubvolInfo *ret) {

f48e75cb9a8112d35855c44a156934f2ee0edb2eLennart Poettering struct btrfs_ioctl_search_args args = {

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering /* Tree of tree roots */

9f6eb1cd58f2ddf2eb6ba0e4de056e13d938af75Kay Sievers .key.tree_id = BTRFS_ROOT_TREE_OBJECTID,

9f6eb1cd58f2ddf2eb6ba0e4de056e13d938af75Kay Sievers

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering /* Look precisely for the subvolume items */

9f6eb1cd58f2ddf2eb6ba0e4de056e13d938af75Kay Sievers .key.min_type = BTRFS_ROOT_ITEM_KEY,

9f6eb1cd58f2ddf2eb6ba0e4de056e13d938af75Kay Sievers .key.max_type = BTRFS_ROOT_ITEM_KEY,

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering

9f6eb1cd58f2ddf2eb6ba0e4de056e13d938af75Kay Sievers .key.min_offset = 0,

9f6eb1cd58f2ddf2eb6ba0e4de056e13d938af75Kay Sievers .key.max_offset = (uint64_t) -1,

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering

9f6eb1cd58f2ddf2eb6ba0e4de056e13d938af75Kay Sievers /* No restrictions on the other components */

a1da85830bfaa77b9eb9c54693e5573559c97e50Tom Gundersen .key.min_transid = 0,

27e72d6b22890ba4a8cbc05c49667cd1cccf1461Simon Peeters .key.max_transid = (uint64_t) -1,

a1da85830bfaa77b9eb9c54693e5573559c97e50Tom Gundersen };

da927ba997d68401563b927f92e6e40e021a8e5cMichal Schmidt

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering uint64_t subvol_id;

a7893c6b28772edbc7e1fea3c209caa54d465648Lennart Poettering bool found = false;

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering int r;

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering

a1da85830bfaa77b9eb9c54693e5573559c97e50Tom Gundersen assert(fd >= 0);

a1da85830bfaa77b9eb9c54693e5573559c97e50Tom Gundersen assert(ret);

a1da85830bfaa77b9eb9c54693e5573559c97e50Tom Gundersen

9f6eb1cd58f2ddf2eb6ba0e4de056e13d938af75Kay Sievers r = btrfs_subvol_get_id_fd(fd, &subvol_id);

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering if (r < 0)

9f6eb1cd58f2ddf2eb6ba0e4de056e13d938af75Kay Sievers return r;

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering args.key.min_objectid = args.key.max_objectid = subvol_id;

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering while (btrfs_ioctl_search_args_compare(&args) <= 0) {

9f6eb1cd58f2ddf2eb6ba0e4de056e13d938af75Kay Sievers const struct btrfs_ioctl_search_header *sh;

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering unsigned i;

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering args.key.nr_items = 256;

9f6eb1cd58f2ddf2eb6ba0e4de056e13d938af75Kay Sievers if (ioctl(fd, BTRFS_IOC_TREE_SEARCH, &args) < 0)

a1da85830bfaa77b9eb9c54693e5573559c97e50Tom Gundersen return -errno;

9f6eb1cd58f2ddf2eb6ba0e4de056e13d938af75Kay Sievers

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering if (args.key.nr_items <= 0)

9f6eb1cd58f2ddf2eb6ba0e4de056e13d938af75Kay Sievers break;

8c841f21f5042b11acc91cc1b039cb162cbbe8f4Djalal Harouni

9f6eb1cd58f2ddf2eb6ba0e4de056e13d938af75Kay Sievers FOREACH_BTRFS_IOCTL_SEARCH_HEADER(i, sh, args) {

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering const struct btrfs_root_item *ri;

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering /* Make sure we start the next search at least from this entry */

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering btrfs_ioctl_search_args_set(&args, sh);

a1da85830bfaa77b9eb9c54693e5573559c97e50Tom Gundersen

a1da85830bfaa77b9eb9c54693e5573559c97e50Tom Gundersen if (sh->objectid != subvol_id)

a1da85830bfaa77b9eb9c54693e5573559c97e50Tom Gundersen continue;

a1da85830bfaa77b9eb9c54693e5573559c97e50Tom Gundersen if (sh->type != BTRFS_ROOT_ITEM_KEY)

a1da85830bfaa77b9eb9c54693e5573559c97e50Tom Gundersen continue;

a1da85830bfaa77b9eb9c54693e5573559c97e50Tom Gundersen

a1da85830bfaa77b9eb9c54693e5573559c97e50Tom Gundersen /* Older versions of the struct lacked the otime setting */

a1da85830bfaa77b9eb9c54693e5573559c97e50Tom Gundersen if (sh->len < offsetof(struct btrfs_root_item, otime) + sizeof(struct btrfs_timespec))

a1da85830bfaa77b9eb9c54693e5573559c97e50Tom Gundersen continue;

a1da85830bfaa77b9eb9c54693e5573559c97e50Tom Gundersen

a1da85830bfaa77b9eb9c54693e5573559c97e50Tom Gundersen ri = BTRFS_IOCTL_SEARCH_HEADER_BODY(sh);

a1da85830bfaa77b9eb9c54693e5573559c97e50Tom Gundersen

a1da85830bfaa77b9eb9c54693e5573559c97e50Tom Gundersen ret->otime = (usec_t) le64toh(ri->otime.sec) * USEC_PER_SEC +

a1da85830bfaa77b9eb9c54693e5573559c97e50Tom Gundersen (usec_t) le32toh(ri->otime.nsec) / NSEC_PER_USEC;

a1da85830bfaa77b9eb9c54693e5573559c97e50Tom Gundersen

5b30bef856e89a571df57b7b953e9a1409d9acedLennart Poettering ret->subvol_id = subvol_id;

5b30bef856e89a571df57b7b953e9a1409d9acedLennart Poettering ret->read_only = !!(le64toh(ri->flags) & BTRFS_ROOT_SUBVOL_RDONLY);

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering

9f6eb1cd58f2ddf2eb6ba0e4de056e13d938af75Kay Sievers assert_cc(sizeof(ri->uuid) == sizeof(ret->uuid));

9f6eb1cd58f2ddf2eb6ba0e4de056e13d938af75Kay Sievers memcpy(&ret->uuid, ri->uuid, sizeof(ret->uuid));

9f6eb1cd58f2ddf2eb6ba0e4de056e13d938af75Kay Sievers memcpy(&ret->parent_uuid, ri->parent_uuid, sizeof(ret->parent_uuid));

9f6eb1cd58f2ddf2eb6ba0e4de056e13d938af75Kay Sievers

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering found = true;

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering goto finish;

9f6eb1cd58f2ddf2eb6ba0e4de056e13d938af75Kay Sievers }

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering /* Increase search key by one, to read the next item, if we can. */

a1da85830bfaa77b9eb9c54693e5573559c97e50Tom Gundersen if (!btrfs_ioctl_search_args_inc(&args))

a1da85830bfaa77b9eb9c54693e5573559c97e50Tom Gundersen break;

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering }

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poetteringfinish:

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering if (!found)

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering return -ENODATA;

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering return 0;

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering}

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poetteringint btrfs_subvol_get_quota_fd(int fd, BtrfsQuotaInfo *ret) {

a1da85830bfaa77b9eb9c54693e5573559c97e50Tom Gundersen

a1da85830bfaa77b9eb9c54693e5573559c97e50Tom Gundersen struct btrfs_ioctl_search_args args = {

a1da85830bfaa77b9eb9c54693e5573559c97e50Tom Gundersen /* Tree of quota items */

a1da85830bfaa77b9eb9c54693e5573559c97e50Tom Gundersen .key.tree_id = BTRFS_QUOTA_TREE_OBJECTID,

a1da85830bfaa77b9eb9c54693e5573559c97e50Tom Gundersen

a1da85830bfaa77b9eb9c54693e5573559c97e50Tom Gundersen /* The object ID is always 0 */

a1da85830bfaa77b9eb9c54693e5573559c97e50Tom Gundersen .key.min_objectid = 0,

a1da85830bfaa77b9eb9c54693e5573559c97e50Tom Gundersen .key.max_objectid = 0,

a1da85830bfaa77b9eb9c54693e5573559c97e50Tom Gundersen

a1da85830bfaa77b9eb9c54693e5573559c97e50Tom Gundersen /* Look precisely for the quota items */

a1da85830bfaa77b9eb9c54693e5573559c97e50Tom Gundersen .key.min_type = BTRFS_QGROUP_STATUS_KEY,

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering .key.max_type = BTRFS_QGROUP_LIMIT_KEY,

a1da85830bfaa77b9eb9c54693e5573559c97e50Tom Gundersen

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering /* No restrictions on the other components */

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering .key.min_transid = 0,

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering .key.max_transid = (uint64_t) -1,

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering };

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering

1dba654b27918c22e413ac5b3c19301f1ff86ad2Lennart Poettering uint64_t subvol_id;

1dba654b27918c22e413ac5b3c19301f1ff86ad2Lennart Poettering bool found_info = false, found_limit = false;

1dba654b27918c22e413ac5b3c19301f1ff86ad2Lennart Poettering int r;

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering

1dba654b27918c22e413ac5b3c19301f1ff86ad2Lennart Poettering assert(fd >= 0);

1dba654b27918c22e413ac5b3c19301f1ff86ad2Lennart Poettering assert(ret);

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering

1dba654b27918c22e413ac5b3c19301f1ff86ad2Lennart Poettering r = btrfs_subvol_get_id_fd(fd, &subvol_id);

1dba654b27918c22e413ac5b3c19301f1ff86ad2Lennart Poettering if (r < 0)

1dba654b27918c22e413ac5b3c19301f1ff86ad2Lennart Poettering return r;

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering

1dba654b27918c22e413ac5b3c19301f1ff86ad2Lennart Poettering args.key.min_offset = args.key.max_offset = subvol_id;

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering

1ee306e1248866617c96ed9f4263f375588ad838Lennart Poettering while (btrfs_ioctl_search_args_compare(&args) <= 0) {

1dba654b27918c22e413ac5b3c19301f1ff86ad2Lennart Poettering const struct btrfs_ioctl_search_header *sh;

923d8fd381bced1c2d90ca53d18629d61a0f454aLennart Poettering unsigned i;

923d8fd381bced1c2d90ca53d18629d61a0f454aLennart Poettering

923d8fd381bced1c2d90ca53d18629d61a0f454aLennart Poettering args.key.nr_items = 256;

923d8fd381bced1c2d90ca53d18629d61a0f454aLennart Poettering if (ioctl(fd, BTRFS_IOC_TREE_SEARCH, &args) < 0)

923d8fd381bced1c2d90ca53d18629d61a0f454aLennart Poettering return -errno;

923d8fd381bced1c2d90ca53d18629d61a0f454aLennart Poettering

1dba654b27918c22e413ac5b3c19301f1ff86ad2Lennart Poettering if (args.key.nr_items <= 0)

923d8fd381bced1c2d90ca53d18629d61a0f454aLennart Poettering break;

923d8fd381bced1c2d90ca53d18629d61a0f454aLennart Poettering

923d8fd381bced1c2d90ca53d18629d61a0f454aLennart Poettering FOREACH_BTRFS_IOCTL_SEARCH_HEADER(i, sh, args) {

923d8fd381bced1c2d90ca53d18629d61a0f454aLennart Poettering

923d8fd381bced1c2d90ca53d18629d61a0f454aLennart Poettering /* Make sure we start the next search at least from this entry */

923d8fd381bced1c2d90ca53d18629d61a0f454aLennart Poettering btrfs_ioctl_search_args_set(&args, sh);

1dba654b27918c22e413ac5b3c19301f1ff86ad2Lennart Poettering

923d8fd381bced1c2d90ca53d18629d61a0f454aLennart Poettering if (sh->objectid != 0)

1dba654b27918c22e413ac5b3c19301f1ff86ad2Lennart Poettering continue;

923d8fd381bced1c2d90ca53d18629d61a0f454aLennart Poettering if (sh->offset != subvol_id)

923d8fd381bced1c2d90ca53d18629d61a0f454aLennart Poettering continue;

1dba654b27918c22e413ac5b3c19301f1ff86ad2Lennart Poettering

923d8fd381bced1c2d90ca53d18629d61a0f454aLennart Poettering if (sh->type == BTRFS_QGROUP_INFO_KEY) {

923d8fd381bced1c2d90ca53d18629d61a0f454aLennart Poettering const struct btrfs_qgroup_info_item *qii = BTRFS_IOCTL_SEARCH_HEADER_BODY(sh);

923d8fd381bced1c2d90ca53d18629d61a0f454aLennart Poettering

923d8fd381bced1c2d90ca53d18629d61a0f454aLennart Poettering ret->referred = le64toh(qii->rfer);

923d8fd381bced1c2d90ca53d18629d61a0f454aLennart Poettering ret->exclusive = le64toh(qii->excl);

923d8fd381bced1c2d90ca53d18629d61a0f454aLennart Poettering

923d8fd381bced1c2d90ca53d18629d61a0f454aLennart Poettering found_info = true;

04d39279245834494baccfdb9349db8bf80abd13Lennart Poettering

3d94f76c99da13e5603831d0b278f8c8c21bcb02Lennart Poettering } else if (sh->type == BTRFS_QGROUP_LIMIT_KEY) {

a4475f577bd0daf762d6c3b4e58bc484e0cb74afLennart Poettering const struct btrfs_qgroup_limit_item *qli = BTRFS_IOCTL_SEARCH_HEADER_BODY(sh);

04d39279245834494baccfdb9349db8bf80abd13Lennart Poettering

04d39279245834494baccfdb9349db8bf80abd13Lennart Poettering ret->referred_max = le64toh(qli->max_rfer);

04d39279245834494baccfdb9349db8bf80abd13Lennart Poettering ret->exclusive_max = le64toh(qli->max_excl);

34a6778fb9d1065f3fbb8e2243b9f0f25d1d18f1Zbigniew Jędrzejewski-Szmek

34a6778fb9d1065f3fbb8e2243b9f0f25d1d18f1Zbigniew Jędrzejewski-Szmek if (ret->referred_max == 0)

34a6778fb9d1065f3fbb8e2243b9f0f25d1d18f1Zbigniew Jędrzejewski-Szmek ret->referred_max = (uint64_t) -1;

34a6778fb9d1065f3fbb8e2243b9f0f25d1d18f1Zbigniew Jędrzejewski-Szmek if (ret->exclusive_max == 0)

34a6778fb9d1065f3fbb8e2243b9f0f25d1d18f1Zbigniew Jędrzejewski-Szmek ret->exclusive_max = (uint64_t) -1;

04d39279245834494baccfdb9349db8bf80abd13Lennart Poettering

f69157a66ffe413b4cf8bd79057487fc8921e78bThomas Hindoe Paaboel Andersen found_limit = true;

04d39279245834494baccfdb9349db8bf80abd13Lennart Poettering }

04d39279245834494baccfdb9349db8bf80abd13Lennart Poettering

04d39279245834494baccfdb9349db8bf80abd13Lennart Poettering if (found_info && found_limit)

878cd7e95ca303f9851d227a22d2022bd49944b0Lennart Poettering goto finish;

bc9fd78c7bfc39881e19457e476393635f8b0442Lennart Poettering }

bc9fd78c7bfc39881e19457e476393635f8b0442Lennart Poettering

04d39279245834494baccfdb9349db8bf80abd13Lennart Poettering /* Increase search key by one, to read the next item, if we can. */

bc9fd78c7bfc39881e19457e476393635f8b0442Lennart Poettering if (!btrfs_ioctl_search_args_inc(&args))

04d39279245834494baccfdb9349db8bf80abd13Lennart Poettering break;

04d39279245834494baccfdb9349db8bf80abd13Lennart Poettering }

04d39279245834494baccfdb9349db8bf80abd13Lennart Poettering

04d39279245834494baccfdb9349db8bf80abd13Lennart Poetteringfinish:

04d39279245834494baccfdb9349db8bf80abd13Lennart Poettering if (!found_limit && !found_info)

04d39279245834494baccfdb9349db8bf80abd13Lennart Poettering return -ENODATA;

04d39279245834494baccfdb9349db8bf80abd13Lennart Poettering

03e334a1c7dc8c20c38902aa039440763acc9b17Lennart Poettering if (!found_info) {

04d39279245834494baccfdb9349db8bf80abd13Lennart Poettering ret->referred = (uint64_t) -1;

878cd7e95ca303f9851d227a22d2022bd49944b0Lennart Poettering ret->exclusive = (uint64_t) -1;

04d39279245834494baccfdb9349db8bf80abd13Lennart Poettering }

04d39279245834494baccfdb9349db8bf80abd13Lennart Poettering

04d39279245834494baccfdb9349db8bf80abd13Lennart Poettering if (!found_limit) {

04d39279245834494baccfdb9349db8bf80abd13Lennart Poettering ret->referred_max = (uint64_t) -1;

04d39279245834494baccfdb9349db8bf80abd13Lennart Poettering ret->exclusive_max = (uint64_t) -1;

04d39279245834494baccfdb9349db8bf80abd13Lennart Poettering }

04d39279245834494baccfdb9349db8bf80abd13Lennart Poettering

04d39279245834494baccfdb9349db8bf80abd13Lennart Poettering return 0;

04d39279245834494baccfdb9349db8bf80abd13Lennart Poettering}

04d39279245834494baccfdb9349db8bf80abd13Lennart Poettering

04d39279245834494baccfdb9349db8bf80abd13Lennart Poetteringint btrfs_defrag_fd(int fd) {

04d39279245834494baccfdb9349db8bf80abd13Lennart Poettering assert(fd >= 0);

04d39279245834494baccfdb9349db8bf80abd13Lennart Poettering

04d39279245834494baccfdb9349db8bf80abd13Lennart Poettering if (ioctl(fd, BTRFS_IOC_DEFRAG, NULL) < 0)

04d39279245834494baccfdb9349db8bf80abd13Lennart Poettering return -errno;

bc9fd78c7bfc39881e19457e476393635f8b0442Lennart Poettering

04d39279245834494baccfdb9349db8bf80abd13Lennart Poettering return 0;

04d39279245834494baccfdb9349db8bf80abd13Lennart Poettering}

04d39279245834494baccfdb9349db8bf80abd13Lennart Poettering

04d39279245834494baccfdb9349db8bf80abd13Lennart Poetteringint btrfs_defrag(const char *p) {

04d39279245834494baccfdb9349db8bf80abd13Lennart Poettering _cleanup_close_ int fd = -1;

03e334a1c7dc8c20c38902aa039440763acc9b17Lennart Poettering

04d39279245834494baccfdb9349db8bf80abd13Lennart Poettering fd = open(p, O_RDWR|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW);

fbadf04511389c4a0687ba5e9baf0ecebdbb07f1Lennart Poettering if (fd < 0)

878cd7e95ca303f9851d227a22d2022bd49944b0Lennart Poettering return -errno;

878cd7e95ca303f9851d227a22d2022bd49944b0Lennart Poettering

878cd7e95ca303f9851d227a22d2022bd49944b0Lennart Poettering return btrfs_defrag_fd(fd);

878cd7e95ca303f9851d227a22d2022bd49944b0Lennart Poettering}

fbadf04511389c4a0687ba5e9baf0ecebdbb07f1Lennart Poettering