#include "send.h"
#include "send-utils.h"
+#include "help.h"
-#define SEND_BUFFER_SIZE (64 * 1024)
+#define SEND_BUFFER_SIZE SZ_64K
/*
* Default is 1 for historical reasons, changing may break scripts that expect
struct subvol_uuid_search sus;
};
-static int get_root_id(struct btrfs_send *s, const char *path, u64 *root_id)
+static int get_root_id(struct btrfs_send *sctx, const char *path, u64 *root_id)
{
struct subvol_info *si;
- si = subvol_uuid_search(&s->sus, 0, NULL, 0, path,
+ si = subvol_uuid_search(&sctx->sus, 0, NULL, 0, path,
subvol_search_by_path);
- if (!si)
- return -ENOENT;
+ if (IS_ERR_OR_NULL(si)) {
+ if (!si)
+ return -ENOENT;
+ else
+ return PTR_ERR(si);
+ }
*root_id = si->root_id;
free(si->path);
free(si);
return 0;
}
-static struct subvol_info *get_parent(struct btrfs_send *s, u64 root_id)
+static struct subvol_info *get_parent(struct btrfs_send *sctx, u64 root_id)
{
struct subvol_info *si_tmp;
struct subvol_info *si;
- si_tmp = subvol_uuid_search(&s->sus, root_id, NULL, 0, NULL,
+ si_tmp = subvol_uuid_search(&sctx->sus, root_id, NULL, 0, NULL,
subvol_search_by_root_id);
- if (!si_tmp)
- return NULL;
+ if (IS_ERR_OR_NULL(si_tmp))
+ return si_tmp;
- si = subvol_uuid_search(&s->sus, 0, si_tmp->parent_uuid, 0, NULL,
+ si = subvol_uuid_search(&sctx->sus, 0, si_tmp->parent_uuid, 0, NULL,
subvol_search_by_uuid);
free(si_tmp->path);
free(si_tmp);
return si;
}
-static int find_good_parent(struct btrfs_send *s, u64 root_id, u64 *found)
+static int find_good_parent(struct btrfs_send *sctx, u64 root_id, u64 *found)
{
int ret;
struct subvol_info *parent = NULL;
struct subvol_info *parent2 = NULL;
struct subvol_info *best_parent = NULL;
- __s64 tmp;
u64 best_diff = (u64)-1;
int i;
- parent = get_parent(s, root_id);
- if (!parent) {
- ret = -ENOENT;
+ parent = get_parent(sctx, root_id);
+ if (IS_ERR_OR_NULL(parent)) {
+ if (!parent)
+ ret = -ENOENT;
+ else
+ ret = PTR_ERR(parent);
goto out;
}
- for (i = 0; i < s->clone_sources_count; i++) {
- if (s->clone_sources[i] == parent->root_id) {
+ for (i = 0; i < sctx->clone_sources_count; i++) {
+ if (sctx->clone_sources[i] == parent->root_id) {
best_parent = parent;
parent = NULL;
goto out_found;
}
}
- for (i = 0; i < s->clone_sources_count; i++) {
- parent2 = get_parent(s, s->clone_sources[i]);
- if (!parent2)
+ for (i = 0; i < sctx->clone_sources_count; i++) {
+ s64 tmp;
+
+ parent2 = get_parent(sctx, sctx->clone_sources[i]);
+ if (IS_ERR_OR_NULL(parent2))
continue;
if (parent2->root_id != parent->root_id) {
free(parent2->path);
free(parent2->path);
free(parent2);
- parent2 = subvol_uuid_search(&s->sus, s->clone_sources[i], NULL,
- 0, NULL, subvol_search_by_root_id);
-
- if (!parent2) {
- ret = -ENOENT;
+ parent2 = subvol_uuid_search(&sctx->sus,
+ sctx->clone_sources[i], NULL, 0, NULL,
+ subvol_search_by_root_id);
+ if (IS_ERR_OR_NULL(parent2)) {
+ if (!parent2)
+ ret = -ENOENT;
+ else
+ ret = PTR_ERR(parent2);
goto out;
}
tmp = parent2->ctransid - parent->ctransid;
if (tmp < 0)
- tmp *= -1;
+ tmp = -tmp;
if (tmp < best_diff) {
if (best_parent) {
free(best_parent->path);
return ret;
}
-static int add_clone_source(struct btrfs_send *s, u64 root_id)
+static int add_clone_source(struct btrfs_send *sctx, u64 root_id)
{
void *tmp;
- tmp = s->clone_sources;
- s->clone_sources = realloc(s->clone_sources,
- sizeof(*s->clone_sources) * (s->clone_sources_count + 1));
+ tmp = sctx->clone_sources;
+ sctx->clone_sources = realloc(sctx->clone_sources,
+ sizeof(*sctx->clone_sources) * (sctx->clone_sources_count + 1));
- if (!s->clone_sources) {
+ if (!sctx->clone_sources) {
free(tmp);
return -ENOMEM;
}
- s->clone_sources[s->clone_sources_count++] = root_id;
+ sctx->clone_sources[sctx->clone_sources_count++] = root_id;
return 0;
}
-static int write_buf(int fd, const void *buf, int size)
+#if 0
+static int write_buf(int fd, const char *buf, size_t size)
{
int ret;
- int pos = 0;
+ size_t pos = 0;
while (pos < size) {
- ret = write(fd, (char*)buf + pos, size - pos);
- if (ret < 0) {
+ ssize_t wbytes;
+
+ wbytes = write(fd, buf + pos, size - pos);
+ if (wbytes < 0) {
ret = -errno;
error("failed to dump stream: %s", strerror(-ret));
goto out;
}
- if (!ret) {
+ if (!wbytes) {
ret = -EIO;
error("failed to dump stream: %s", strerror(-ret));
goto out;
}
- pos += ret;
+ pos += wbytes;
}
ret = 0;
return ret;
}
-static void *dump_thread(void *arg_)
+static void* read_sent_data_copy(void *arg)
{
int ret;
- struct btrfs_send *s = (struct btrfs_send*)arg_;
+ struct btrfs_send *sctx = (struct btrfs_send*)arg;
char buf[SEND_BUFFER_SIZE];
while (1) {
ssize_t rbytes;
- rbytes = read(s->send_fd, buf, sizeof(buf));
+ rbytes = read(sctx->send_fd, buf, sizeof(buf));
if (rbytes < 0) {
ret = -errno;
- error("failed to read stream from kernel: %s\n",
+ error("failed to read stream from kernel: %s",
strerror(-ret));
goto out;
}
ret = 0;
goto out;
}
- ret = write_buf(s->dump_fd, buf, rbytes);
+ ret = write_buf(sctx->dump_fd, buf, rbytes);
if (ret < 0)
goto out;
}
out:
- if (ret < 0) {
+ if (ret < 0)
exit(-ret);
+
+ return ERR_PTR(ret);
+}
+#endif
+
+static void *read_sent_data(void *arg)
+{
+ int ret;
+ struct btrfs_send *sctx = (struct btrfs_send*)arg;
+
+ while (1) {
+ ssize_t sbytes;
+
+ /* Source is a pipe, output is either file or stdout */
+ sbytes = splice(sctx->send_fd, NULL, sctx->dump_fd,
+ NULL, SEND_BUFFER_SIZE, SPLICE_F_MORE);
+ if (sbytes < 0) {
+ ret = -errno;
+ error("failed to read stream from kernel: %s",
+ strerror(-ret));
+ goto out;
+ }
+ if (!sbytes) {
+ ret = 0;
+ goto out;
+ }
}
+out:
+ if (ret < 0)
+ exit(-ret);
+
return ERR_PTR(ret);
}
send->send_fd = pipefd[0];
if (!ret)
- ret = pthread_create(&t_read, NULL, dump_thread,
- send);
+ ret = pthread_create(&t_read, NULL, read_sent_data, send);
if (ret) {
ret = -ret;
error("thread setup failed: %s", strerror(-ret));
return ret;
}
-static int init_root_path(struct btrfs_send *s, const char *subvol)
+static int init_root_path(struct btrfs_send *sctx, const char *subvol)
{
int ret = 0;
- if (s->root_path)
+ if (sctx->root_path)
goto out;
- ret = find_mount_root(subvol, &s->root_path);
+ ret = find_mount_root(subvol, &sctx->root_path);
if (ret < 0) {
error("failed to determine mount point for %s: %s",
subvol, strerror(-ret));
goto out;
}
- s->mnt_fd = open(s->root_path, O_RDONLY | O_NOATIME);
- if (s->mnt_fd < 0) {
+ sctx->mnt_fd = open(sctx->root_path, O_RDONLY | O_NOATIME);
+ if (sctx->mnt_fd < 0) {
ret = -errno;
- error("cannot open '%s': %s", s->root_path, strerror(-ret));
+ error("cannot open '%s': %s", sctx->root_path, strerror(-ret));
goto out;
}
- ret = subvol_uuid_search_init(s->mnt_fd, &s->sus);
+ ret = subvol_uuid_search_init(sctx->mnt_fd, &sctx->sus);
if (ret < 0) {
error("failed to initialize subvol search: %s",
strerror(-ret));
}
-static int is_subvol_ro(struct btrfs_send *s, const char *subvol)
+static int is_subvol_ro(struct btrfs_send *sctx, const char *subvol)
{
int ret;
u64 flags;
int fd = -1;
- fd = openat(s->mnt_fd, subvol, O_RDONLY | O_NOATIME);
+ fd = openat(sctx->mnt_fd, subvol, O_RDONLY | O_NOATIME);
if (fd < 0) {
ret = -errno;
error("cannot open %s: %s", subvol, strerror(-ret));
return ret;
}
+static int set_root_info(struct btrfs_send *sctx, const char *subvol,
+ u64 *root_id)
+{
+ int ret;
+
+ ret = init_root_path(sctx, subvol);
+ if (ret < 0)
+ goto out;
+
+ ret = get_root_id(sctx, subvol_strip_mountpoint(sctx->root_path, subvol),
+ root_id);
+ if (ret < 0) {
+ error("cannot resolve rootid for %s", subvol);
+ goto out;
+ }
+
+out:
+ return ret;
+}
+
+static void free_send_info(struct btrfs_send *sctx)
+{
+ if (sctx->mnt_fd >= 0) {
+ close(sctx->mnt_fd);
+ sctx->mnt_fd = -1;
+ }
+ free(sctx->root_path);
+ sctx->root_path = NULL;
+ subvol_uuid_search_finit(&sctx->sus);
+}
+
int cmd_send(int argc, char **argv)
{
char *subvol = NULL;
goto out;
}
- ret = init_root_path(&send, subvol);
+ ret = set_root_info(&send, subvol, &root_id);
if (ret < 0)
goto out;
- ret = get_root_id(&send,
- subvol_strip_mountpoint(send.root_path, subvol),
- &root_id);
- if (ret < 0) {
- error("cannot resolve rootid for %s", subvol);
- goto out;
- }
-
ret = is_subvol_ro(&send, subvol);
if (ret < 0)
goto out;
error("cannot add clone source: %s", strerror(-ret));
goto out;
}
- subvol_uuid_search_finit(&send.sus);
free(subvol);
subvol = NULL;
- if (send.mnt_fd >= 0) {
- close(send.mnt_fd);
- send.mnt_fd = -1;
- }
- free(send.root_path);
- send.root_path = NULL;
+ free_send_info(&send);
full_send = 0;
break;
case 'f':
usage(cmd_send_usage);
if (outname[0]) {
- send.dump_fd = creat(outname, 0600);
+ int tmpfd;
+
+ /*
+ * Try to use an existing file first. Even if send runs as
+ * root, it might not have permissions to create file (eg. on a
+ * NFS) but it should still be able to use a pre-created file.
+ */
+ tmpfd = open(outname, O_WRONLY | O_TRUNC);
+ if (tmpfd < 0) {
+ if (errno == ENOENT)
+ tmpfd = open(outname,
+ O_CREAT | O_WRONLY | O_TRUNC, 0600);
+ }
+ send.dump_fd = tmpfd;
if (send.dump_fd == -1) {
ret = -errno;
error("cannot create '%s': %s", outname, strerror(-ret));
goto out;
}
- if (!full_send && root_id) {
+ if (!full_send && !snapshot_parent) {
+ ret = set_root_info(&send, subvol, &root_id);
+ if (ret < 0)
+ goto out;
+
ret = find_good_parent(&send, root_id, &parent_root_id);
if (ret < 0) {
error("parent determination failed for %lld",
if (ret < 0)
goto out;
- if (!full_send && root_id) {
+ if (!full_send && !snapshot_parent) {
/* done with this subvol, so add it to the clone sources */
ret = add_clone_source(&send, root_id);
if (ret < 0) {
error("cannot add clone source: %s", strerror(-ret));
goto out;
}
+ free_send_info(&send);
}
}
free(subvol);
free(snapshot_parent);
free(send.clone_sources);
- if (send.mnt_fd >= 0)
- close(send.mnt_fd);
- free(send.root_path);
- subvol_uuid_search_finit(&send.sus);
+ free_send_info(&send);
return !!ret;
}
projects / platform / upstream / btrfs-progs.git / blobdiff