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Merge pull request #15376 from poettering/homed-btrfs-subvol-luks

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homed: when doing luks homedir with btrfs inside, place subvol at top of fs
This commit is contained in:
Zbigniew Jędrzejewski-Szmek 2020-04-11 16:26:01 +02:00 committed by GitHub
commit bba97c98b8
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5 changed files with 40 additions and 16 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
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@ -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);

7
src/home/homework-luks.c
View File

@ -8,6 +8,7 @@
#include "blkid-util.h"
#include "blockdev-util.h"
#include "btrfs-util.h"
#include "chattr-util.h"
#include "dm-util.h"
#include "errno-util.h"
@ -2037,8 +2038,10 @@ int home_create_luks(
goto fail;
}
if (mkdir(subdir, 0700) < 0) {
r = log_error_errno(errno, "Failed to create user directory in mounted image file: %m");
/* Prefer using a btrfs subvolume if we can, fall back to directory otherwise */
r = btrfs_subvol_make_fallback(subdir, 0700);
if (r < 0) {
log_error_errno(r, "Failed to create user directory in mounted image file: %m");
goto fail;
}

11
src/import/import-tar.c
View File

@ -220,13 +220,10 @@ static int tar_import_fork_tar(TarImport *i) {
(void) mkdir_parents_label(i->temp_path, 0700);
r = btrfs_subvol_make(i->temp_path);
if (r == -ENOTTY) {
if (mkdir(i->temp_path, 0755) < 0)
return log_error_errno(errno, "Failed to create directory %s: %m", i->temp_path);
} else if (r < 0)
return log_error_errno(r, "Failed to create subvolume %s: %m", i->temp_path);
else
r = btrfs_subvol_make_fallback(i->temp_path, 0755);
if (r < 0)
return log_error_errno(r, "Failed to create directory/subvolume %s: %m", i->temp_path);
if (r > 0) /* actually btrfs subvol */
(void) import_assign_pool_quota_and_warn(i->temp_path);
i->tar_fd = import_fork_tar_x(i->temp_path, &i->tar_pid);

11
src/import/pull-tar.c
View File

@ -415,13 +415,10 @@ static int tar_pull_job_on_open_disk_tar(PullJob *j) {
mkdir_parents_label(i->temp_path, 0700);
r = btrfs_subvol_make(i->temp_path);
if (r == -ENOTTY) {
if (mkdir(i->temp_path, 0755) < 0)
return log_error_errno(errno, "Failed to create directory %s: %m", i->temp_path);
} else if (r < 0)
return log_error_errno(r, "Failed to create subvolume %s: %m", i->temp_path);
else
r = btrfs_subvol_make_fallback(i->temp_path, 0755);
if (r < 0)
return log_error_errno(r, "Failed to create directory/subvolume %s: %m", i->temp_path);
if (r > 0) /* actually btrfs subvol */
(void) import_assign_pool_quota_and_warn(i->temp_path);
j->disk_fd = import_fork_tar_x(i->temp_path, &i->tar_pid);