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btrfs-util: define helper that creates a btrfs subvol if we can, and a directory as fallback

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This commit is contained in:
Lennart Poettering 2020-04-09 11:56:23 +02:00
parent a1db42eb0b
commit d78a95d751
2 changed files with 27 additions and 0 deletions
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25
src/basic/btrfs-util.c
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@ -160,6 +160,31 @@ int btrfs_subvol_make(const char *path) {
return btrfs_subvol_make_fd(fd, subvolume);
}
int btrfs_subvol_make_fallback(const char *path, mode_t mode) {
mode_t old, combined;
int r;
assert(path);
/* Let's work like mkdir(), i.e. take the specified mode, and mask it with the current umask. */
old = umask(~mode);
combined = old | ~mode;
if (combined != ~mode)
umask(combined);
r = btrfs_subvol_make(path);
umask(old);
if (r >= 0)
return 1; /* subvol worked */
if (r != -ENOTTY)
return r;
if (mkdir(path, mode) < 0)
return -errno;
return 0; /* plain directory */
}
int btrfs_subvol_set_read_only_fd(int fd, bool b) {
uint64_t flags, nflags;
struct stat st;

2
src/basic/btrfs-util.h
View File

@ -66,6 +66,8 @@ int btrfs_quota_scan_ongoing(int fd);
int btrfs_subvol_make(const char *path);
int btrfs_subvol_make_fd(int fd, const char *subvolume);
int btrfs_subvol_make_fallback(const char *path, mode_t);
int btrfs_subvol_snapshot_fd_full(int old_fd, const char *new_path, BtrfsSnapshotFlags flags, copy_progress_path_t progress_path, copy_progress_bytes_t progress_bytes, void *userdata);
static inline int btrfs_subvol_snapshot_fd(int old_fd, const char *new_path, BtrfsSnapshotFlags flags) {
return btrfs_subvol_snapshot_fd_full(old_fd, new_path, flags, NULL, NULL, NULL);