#include "util.h"
#include "path-util.h"
#include "macro.h"
-#include "strv.h"
#include "copy.h"
#include "selinux-util.h"
#include "smack-util.h"
+#include "fileio.h"
#include "btrfs-ctree.h"
#include "btrfs-util.h"
return F_TYPE_EQUAL(sfs.f_type, BTRFS_SUPER_MAGIC);
}
-int btrfs_subvol_snapshot(const char *old_path, const char *new_path, bool read_only, bool fallback_copy) {
+int btrfs_subvol_snapshot_fd(int old_fd, const char *new_path, BtrfsSnapshotFlags flags) {
struct btrfs_ioctl_vol_args_v2 args = {
- .flags = read_only ? BTRFS_SUBVOL_RDONLY : 0,
+ .flags = flags & BTRFS_SNAPSHOT_READ_ONLY ? BTRFS_SUBVOL_RDONLY : 0,
};
- _cleanup_close_ int old_fd = -1, new_fd = -1;
+ _cleanup_close_ int new_fd = -1;
const char *subvolume;
int r;
- assert(old_path);
-
- old_fd = open(old_path, O_RDONLY|O_NOCTTY|O_CLOEXEC|O_DIRECTORY);
- if (old_fd < 0)
- return -errno;
+ assert(new_path);
r = btrfs_is_snapshot(old_fd);
if (r < 0)
return r;
if (r == 0) {
+ if (!(flags & BTRFS_SNAPSHOT_FALLBACK_COPY))
+ return -EISDIR;
- if (fallback_copy) {
- r = btrfs_subvol_make(new_path);
- if (r < 0)
- return r;
+ r = btrfs_subvol_make(new_path);
+ if (r < 0)
+ return r;
- r = copy_directory_fd(old_fd, new_path, true);
+ r = copy_directory_fd(old_fd, new_path, true);
+ if (r < 0) {
+ btrfs_subvol_remove(new_path, false);
+ return r;
+ }
+
+ if (flags & BTRFS_SNAPSHOT_READ_ONLY) {
+ r = btrfs_subvol_set_read_only(new_path, true);
if (r < 0) {
- btrfs_subvol_remove(new_path);
+ btrfs_subvol_remove(new_path, false);
return r;
}
-
- if (read_only) {
- r = btrfs_subvol_set_read_only(new_path, true);
- if (r < 0) {
- btrfs_subvol_remove(new_path);
- return r;
- }
- }
-
- return 0;
}
- return -EISDIR;
+ return 0;
}
r = extract_subvolume_name(new_path, &subvolume);
return 0;
}
+int btrfs_subvol_snapshot(const char *old_path, const char *new_path, BtrfsSnapshotFlags flags) {
+ _cleanup_close_ int old_fd = -1;
+
+ assert(old_path);
+ assert(new_path);
+
+ old_fd = open(old_path, O_RDONLY|O_NOCTTY|O_CLOEXEC|O_DIRECTORY);
+ if (old_fd < 0)
+ return -errno;
+
+ return btrfs_subvol_snapshot_fd(old_fd, new_path, flags);
+}
+
int btrfs_subvol_make(const char *path) {
struct btrfs_ioctl_vol_args args = {};
_cleanup_close_ int fd = -1;
return mac_smack_fix(path, false, false);
}
-int btrfs_subvol_remove(const char *path) {
- struct btrfs_ioctl_vol_args args = {};
- _cleanup_close_ int fd = -1;
- const char *subvolume;
- int r;
-
- assert(path);
-
- r = extract_subvolume_name(path, &subvolume);
- if (r < 0)
- return r;
-
- fd = open_parent(path, O_RDONLY|O_NOCTTY|O_CLOEXEC|O_DIRECTORY);
- if (fd < 0)
- return fd;
+int btrfs_subvol_set_read_only_fd(int fd, bool b) {
+ uint64_t flags, nflags;
+ struct stat st;
- strncpy(args.name, subvolume, sizeof(args.name)-1);
+ assert(fd >= 0);
- if (ioctl(fd, BTRFS_IOC_SNAP_DESTROY, &args) < 0)
+ if (fstat(fd, &st) < 0)
return -errno;
- return 0;
-}
-
-int btrfs_subvol_set_read_only(const char *path, bool b) {
- _cleanup_close_ int fd = -1;
- uint64_t flags, nflags;
-
- fd = open(path, O_RDONLY|O_NOCTTY|O_CLOEXEC);
- if (fd < 0)
- return -errno;
+ if (!S_ISDIR(st.st_mode) || st.st_ino != 256)
+ return -EINVAL;
if (ioctl(fd, BTRFS_IOC_SUBVOL_GETFLAGS, &flags) < 0)
return -errno;
return 0;
}
+int btrfs_subvol_set_read_only(const char *path, bool b) {
+ _cleanup_close_ int fd = -1;
+
+ fd = open(path, O_RDONLY|O_NOCTTY|O_CLOEXEC|O_DIRECTORY);
+ if (fd < 0)
+ return -errno;
+
+ return btrfs_subvol_set_read_only_fd(fd, b);
+}
+
int btrfs_subvol_get_read_only_fd(int fd) {
uint64_t flags;
return 0;
}
-int btrfs_get_block_device(const char *path, dev_t *dev) {
+int btrfs_get_block_device_fd(int fd, dev_t *dev) {
struct btrfs_ioctl_fs_info_args fsi = {};
- _cleanup_close_ int fd = -1;
uint64_t id;
- assert(path);
+ assert(fd >= 0);
assert(dev);
- fd = open(path, O_RDONLY|O_NOCTTY|O_CLOEXEC|O_DIRECTORY);
- if (fd < 0)
- return -errno;
-
if (ioctl(fd, BTRFS_IOC_FS_INFO, &fsi) < 0)
return -errno;
return -ENODEV;
}
+int btrfs_get_block_device(const char *path, dev_t *dev) {
+ _cleanup_close_ int fd = -1;
+
+ assert(path);
+ assert(dev);
+
+ fd = open(path, O_RDONLY|O_NOCTTY|O_CLOEXEC);
+ if (fd < 0)
+ return -errno;
+
+ return btrfs_get_block_device_fd(fd, dev);
+}
+
int btrfs_subvol_get_id_fd(int fd, uint64_t *ret) {
struct btrfs_ioctl_ino_lookup_args args = {
.objectid = BTRFS_FIRST_FREE_OBJECTID
if (sh->type == BTRFS_QGROUP_INFO_KEY) {
const struct btrfs_qgroup_info_item *qii = BTRFS_IOCTL_SEARCH_HEADER_BODY(sh);
- ret->referred = le64toh(qii->rfer);
+ ret->referenced = le64toh(qii->rfer);
ret->exclusive = le64toh(qii->excl);
found_info = true;
} else if (sh->type == BTRFS_QGROUP_LIMIT_KEY) {
const struct btrfs_qgroup_limit_item *qli = BTRFS_IOCTL_SEARCH_HEADER_BODY(sh);
- ret->referred_max = le64toh(qli->max_rfer);
+ ret->referenced_max = le64toh(qli->max_rfer);
ret->exclusive_max = le64toh(qli->max_excl);
- if (ret->referred_max == 0)
- ret->referred_max = (uint64_t) -1;
+ if (ret->referenced_max == 0)
+ ret->referenced_max = (uint64_t) -1;
if (ret->exclusive_max == 0)
ret->exclusive_max = (uint64_t) -1;
return -ENODATA;
if (!found_info) {
- ret->referred = (uint64_t) -1;
+ ret->referenced = (uint64_t) -1;
ret->exclusive = (uint64_t) -1;
}
if (!found_limit) {
- ret->referred_max = (uint64_t) -1;
+ ret->referenced_max = (uint64_t) -1;
ret->exclusive_max = (uint64_t) -1;
}
return btrfs_defrag_fd(fd);
}
+
+int btrfs_quota_enable_fd(int fd, bool b) {
+ struct btrfs_ioctl_quota_ctl_args args = {
+ .cmd = b ? BTRFS_QUOTA_CTL_ENABLE : BTRFS_QUOTA_CTL_DISABLE,
+ };
+
+ assert(fd >= 0);
+
+ if (ioctl(fd, BTRFS_IOC_QUOTA_CTL, &args) < 0)
+ return -errno;
+
+ return 0;
+}
+
+int btrfs_quota_enable(const char *path, bool b) {
+ _cleanup_close_ int fd = -1;
+
+ fd = open(path, O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW);
+ if (fd < 0)
+ return -errno;
+
+ return btrfs_quota_enable_fd(fd, b);
+}
+
+int btrfs_quota_limit_fd(int fd, uint64_t referenced_max) {
+ struct btrfs_ioctl_qgroup_limit_args args = {
+ .lim.max_rfer =
+ referenced_max == (uint64_t) -1 ? 0 :
+ referenced_max == 0 ? 1 : referenced_max,
+ .lim.flags = BTRFS_QGROUP_LIMIT_MAX_RFER,
+ };
+
+ assert(fd >= 0);
+
+ if (ioctl(fd, BTRFS_IOC_QGROUP_LIMIT, &args) < 0)
+ return -errno;
+
+ return 0;
+}
+
+int btrfs_quota_limit(const char *path, uint64_t referenced_max) {
+ _cleanup_close_ int fd = -1;
+
+ fd = open(path, O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW);
+ if (fd < 0)
+ return -errno;
+
+ return btrfs_quota_limit_fd(fd, referenced_max);
+}
+
+int btrfs_resize_loopback_fd(int fd, uint64_t new_size, bool grow_only) {
+ struct btrfs_ioctl_vol_args args = {};
+ _cleanup_free_ char *p = NULL, *loop = NULL, *backing = NULL;
+ _cleanup_close_ int loop_fd = -1, backing_fd = -1;
+ struct stat st;
+ dev_t dev = 0;
+ int r;
+
+ /* btrfs cannot handle file systems < 16M, hence use this as minimum */
+ if (new_size < 16*1024*1024)
+ new_size = 16*1024*1024;
+
+ r = btrfs_get_block_device_fd(fd, &dev);
+ if (r < 0)
+ return r;
+ if (r == 0)
+ return -ENODEV;
+
+ if (asprintf(&p, "/sys/dev/block/%u:%u/loop/backing_file", major(dev), minor(dev)) < 0)
+ return -ENOMEM;
+ r = read_one_line_file(p, &backing);
+ if (r == -ENOENT)
+ return -ENODEV;
+ if (r < 0)
+ return r;
+ if (isempty(backing) || !path_is_absolute(backing))
+ return -ENODEV;
+
+ backing_fd = open(backing, O_RDWR|O_CLOEXEC|O_NOCTTY);
+ if (backing_fd < 0)
+ return -errno;
+
+ if (fstat(backing_fd, &st) < 0)
+ return -errno;
+ if (!S_ISREG(st.st_mode))
+ return -ENODEV;
+
+ if (new_size == (uint64_t) st.st_size)
+ return 0;
+
+ if (grow_only && new_size < (uint64_t) st.st_size)
+ return -EINVAL;
+
+ if (asprintf(&loop, "/dev/block/%u:%u", major(dev), minor(dev)) < 0)
+ return -ENOMEM;
+ loop_fd = open(loop, O_RDWR|O_CLOEXEC|O_NOCTTY);
+ if (loop_fd < 0)
+ return -errno;
+
+ if (snprintf(args.name, sizeof(args.name), "%" PRIu64, new_size) >= (int) sizeof(args.name))
+ return -EINVAL;
+
+ if (new_size < (uint64_t) st.st_size) {
+ /* Decrease size: first decrease btrfs size, then shorten loopback */
+ if (ioctl(fd, BTRFS_IOC_RESIZE, &args) < 0)
+ return -errno;
+ }
+
+ if (ftruncate(backing_fd, new_size) < 0)
+ return -errno;
+
+ if (ioctl(loop_fd, LOOP_SET_CAPACITY, 0) < 0)
+ return -errno;
+
+ if (new_size > (uint64_t) st.st_size) {
+ /* Increase size: first enlarge loopback, then increase btrfs size */
+ if (ioctl(fd, BTRFS_IOC_RESIZE, &args) < 0)
+ return -errno;
+ }
+
+ /* Make sure the free disk space is correctly updated for both file systems */
+ (void) fsync(fd);
+ (void) fsync(backing_fd);
+
+ return 1;
+}
+
+int btrfs_resize_loopback(const char *p, uint64_t new_size, bool grow_only) {
+ _cleanup_close_ int fd = -1;
+
+ fd = open(p, O_RDONLY|O_NOCTTY|O_CLOEXEC);
+ if (fd < 0)
+ return -errno;
+
+ return btrfs_resize_loopback_fd(fd, new_size, grow_only);
+}
+
+static int subvol_remove_children(int fd, const char *subvolume, uint64_t subvol_id, bool recursive) {
+ struct btrfs_ioctl_search_args args = {
+ .key.tree_id = BTRFS_ROOT_TREE_OBJECTID,
+
+ .key.min_objectid = BTRFS_FIRST_FREE_OBJECTID,
+ .key.max_objectid = BTRFS_LAST_FREE_OBJECTID,
+
+ .key.min_type = BTRFS_ROOT_BACKREF_KEY,
+ .key.max_type = BTRFS_ROOT_BACKREF_KEY,
+
+ .key.min_transid = 0,
+ .key.max_transid = (uint64_t) -1,
+ };
+
+ struct btrfs_ioctl_vol_args vol_args = {};
+ _cleanup_close_ int subvol_fd = -1;
+ int r;
+
+ assert(fd >= 0);
+ assert(subvolume);
+
+ /* First, try to remove the subvolume. If it happens to be
+ * already empty, this will just work. */
+ strncpy(vol_args.name, subvolume, sizeof(vol_args.name)-1);
+ if (ioctl(fd, BTRFS_IOC_SNAP_DESTROY, &vol_args) >= 0)
+ return 0;
+ if (!recursive || errno != ENOTEMPTY)
+ return -errno;
+
+ /* OK, the subvolume is not empty, let's look for child
+ * subvolumes, and remove them, first */
+ subvol_fd = openat(fd, subvolume, O_RDONLY|O_NOCTTY|O_CLOEXEC|O_DIRECTORY);
+ if (subvol_fd < 0)
+ return -errno;
+
+ if (subvol_id == 0) {
+ r = btrfs_subvol_get_id_fd(subvol_fd, &subvol_id);
+ if (r < 0)
+ return r;
+ }
+
+ args.key.min_offset = args.key.max_offset = subvol_id;
+
+ while (btrfs_ioctl_search_args_compare(&args) <= 0) {
+ const struct btrfs_ioctl_search_header *sh;
+ unsigned i;
+
+ args.key.nr_items = 256;
+ if (ioctl(fd, BTRFS_IOC_TREE_SEARCH, &args) < 0)
+ return -errno;
+
+ if (args.key.nr_items <= 0)
+ break;
+
+ FOREACH_BTRFS_IOCTL_SEARCH_HEADER(i, sh, args) {
+ _cleanup_free_ char *p = NULL;
+ const struct btrfs_root_ref *ref;
+ struct btrfs_ioctl_ino_lookup_args ino_args;
+
+ btrfs_ioctl_search_args_set(&args, sh);
+
+ if (sh->type != BTRFS_ROOT_BACKREF_KEY)
+ continue;
+ if (sh->offset != subvol_id)
+ continue;
+
+ ref = BTRFS_IOCTL_SEARCH_HEADER_BODY(sh);
+
+ p = strndup((char*) ref + sizeof(struct btrfs_root_ref), le64toh(ref->name_len));
+ if (!p)
+ return -ENOMEM;
+
+ zero(ino_args);
+ ino_args.treeid = subvol_id;
+ ino_args.objectid = htole64(ref->dirid);
+
+ if (ioctl(fd, BTRFS_IOC_INO_LOOKUP, &ino_args) < 0)
+ return -errno;
+
+ if (isempty(ino_args.name))
+ /* Subvolume is in the top-level
+ * directory of the subvolume. */
+ r = subvol_remove_children(subvol_fd, p, sh->objectid, recursive);
+ else {
+ _cleanup_close_ int child_fd = -1;
+
+ /* Subvolume is somewhere further down,
+ * hence we need to open the
+ * containing directory first */
+
+ child_fd = openat(subvol_fd, ino_args.name, O_RDONLY|O_NOCTTY|O_CLOEXEC|O_DIRECTORY);
+ if (child_fd < 0)
+ return -errno;
+
+ r = subvol_remove_children(child_fd, p, sh->objectid, recursive);
+ }
+ if (r < 0)
+ return r;
+ }
+
+ /* Increase search key by one, to read the next item, if we can. */
+ if (!btrfs_ioctl_search_args_inc(&args))
+ break;
+ }
+
+ /* OK, the child subvolumes should all be gone now, let's try
+ * again to remove the subvolume */
+ if (ioctl(fd, BTRFS_IOC_SNAP_DESTROY, &vol_args) < 0)
+ return -errno;
+
+ return 0;
+}
+
+int btrfs_subvol_remove(const char *path, bool recursive) {
+ _cleanup_close_ int fd = -1;
+ const char *subvolume;
+ int r;
+
+ assert(path);
+
+ r = extract_subvolume_name(path, &subvolume);
+ if (r < 0)
+ return r;
+
+ fd = open_parent(path, O_RDONLY|O_NOCTTY|O_CLOEXEC|O_DIRECTORY);
+ if (fd < 0)
+ return fd;
+
+ return subvol_remove_children(fd, subvolume, 0, recursive);
+}
+
+int btrfs_subvol_remove_fd(int fd, const char *subvolume, bool recursive) {
+ return subvol_remove_children(fd, subvolume, 0, recursive);
+}
~ianmdlvl / elogind.git / blobdiff