static bool fs_sis_try_link(struct sis_fs_file *file)
{
const char *path = fs_file_path(&file->file);
const struct stat *st;
struct stat st2;
st = i_stream_stat(file->hash_input, FALSE);
/* we can use the existing file */
if (fs_link(file->super->fs, file->hash_path, path) < 0) {
if (errno != ENOENT && errno != EMLINK)
i_error("fs-sis: %s", fs_last_error(file->super->fs));
/* failed to use link(), continue as if it hadn't been equal */
return FALSE;
}
if (fs_stat(file->super->fs, path, &st2) < 0) {
i_error("fs-sis: %s", fs_last_error(file->super->fs));
if (fs_unlink(file->super->fs, path) < 0)
i_error("fs-sis: %s", fs_last_error(file->super->fs));
return FALSE;
}
if (st->st_ino != st2.st_ino) {
/* the hashes/ file was already replaced with something else */
if (fs_unlink(file->super->fs, path) < 0)
i_error("fs-sis: %s", fs_last_error(file->super->fs));
return FALSE;
}
return TRUE;
}
static void fs_sis_replace_hash_file(struct sis_fs_file *file)
{
const char *hash_fname, *path = fs_file_path(&file->file);
struct fs *super_fs = file->super->fs;
string_t *temp_path;
int ret;
if (file->hash_input == NULL) {
/* hash file didn't exist previously. we should be able to
create it with link() */
if (fs_link(super_fs, path, file->hash_path) < 0) {
if (errno == EEXIST) {
/* the file was just created. it's probably
a duplicate, but it's too much trouble
trying to deduplicate it anymore */
} else {
i_error("fs-sis: %s", fs_last_error(super_fs));
}
}
return;
}
temp_path = t_str_new(256);
hash_fname = strrchr(file->hash_path, '/');
if (hash_fname == NULL)
hash_fname = file->hash_path;
else {
str_append_n(temp_path, file->hash_path,
(hash_fname-file->hash_path) + 1);
hash_fname++;
}
str_printfa(temp_path, "%s%s.tmp",
super_fs->set.temp_file_prefix, hash_fname);
/* replace existing hash file atomically */
ret = fs_link(super_fs, path, str_c(temp_path));
if (ret < 0 && errno == EEXIST) {
/* either someone's racing us or it's a stale file.
try to continue. */
if (fs_unlink(super_fs, str_c(temp_path)) < 0 &&
errno != ENOENT)
i_error("fs-sis: %s", fs_last_error(super_fs));
ret = fs_link(super_fs, path, str_c(temp_path));
}
if (ret < 0) {
i_error("fs-sis: %s", fs_last_error(super_fs));
return;
}
if (fs_rename(super_fs, str_c(temp_path), file->hash_path) < 0) {
if (errno == ENOENT) {
/* apparently someone else just renamed it. ignore. */
} else {
i_error("fs-sis: %s", fs_last_error(super_fs));
}
(void)fs_unlink(super_fs, str_c(temp_path));
}
}
static int
fs_sis_open(struct fs *_fs, const char *path, enum fs_open_mode mode,
enum fs_open_flags flags, struct fs_file **file_r)
{
struct sis_fs *fs = (struct sis_fs *)_fs;
struct sis_fs_file *file;
struct fs_file *super;
const char *dir, *hash;
if (mode == FS_OPEN_MODE_APPEND) {
fs_set_error(_fs, "APPEND mode not supported");
return -1;
}
if (fs_open(fs->super, path, mode | flags, &super) < 0) {
fs_sis_copy_error(fs);
return -1;
}
switch (mode) {
case FS_OPEN_MODE_RDONLY:
*file_r = super;
return 0;
case FS_OPEN_MODE_CREATE:
case FS_OPEN_MODE_REPLACE:
break;
case FS_OPEN_MODE_APPEND:
i_unreached();
}
if (fs_sis_path_parse(_fs, path, &dir, &hash) < 0)
return -1;
file = i_new(struct sis_fs_file, 1);
file->file.fs = _fs;
file->file.path = i_strdup(fs_file_path(super));
file->super = super;
file->open_mode = mode;
file->hash = i_strdup(hash);
/* if hashes/<hash> already exists, open it */
file->hash_path = i_strdup_printf("%s/"HASH_DIR_NAME"/%s", dir, hash);
if (fs_open(fs->super, file->hash_path, FS_OPEN_MODE_RDONLY,
&file->hash_file) < 0 && errno != ENOENT) {
i_error("fs-sis: Couldn't open hash file: %s",
fs_last_error(fs->super));
}
if (file->hash_file != NULL) {
file->hash_input =
fs_read_stream(file->hash_file, IO_BLOCK_SIZE);
}
*file_r = &file->file;
return 0;
}
static void fs_compress_write_stream(struct fs_file *_file)
{
struct compress_fs_file *file = (struct compress_fs_file *)_file;
i_assert(_file->output == NULL);
file->temp_output =
iostream_temp_create_named(_file->fs->temp_path_prefix,
IOSTREAM_TEMP_FLAG_TRY_FD_DUP,
fs_file_path(_file));
_file->output = file->fs->handler->
create_ostream(file->temp_output, file->fs->compress_level);
}
static void fs_crypt_write_stream(struct fs_file *_file)
{
struct crypt_fs_file *file = (struct crypt_fs_file *)_file;
const char *error;
i_assert(_file->output == NULL);
if (fs_crypt_load_keys(file->fs, &error) < 0) {
_file->output = o_stream_create_error_str(EIO,
"Couldn't read settings: %s", error);
return;
}
if (file->fs->keys.public_key == NULL) {
if (_file->fs->set.debug)
i_debug("No public key provided, "
"NOT encrypting stream %s",
fs_file_path(_file));
file->super_output = fs_write_stream(_file->parent);
_file->output = file->super_output;
return;
}
enum io_stream_encrypt_flags flags;
if (strstr(file->fs->enc_algo, "gcm") != NULL ||
strstr(file->fs->enc_algo, "ccm") != NULL) {
flags = IO_STREAM_ENC_INTEGRITY_AEAD;
} else {
flags = IO_STREAM_ENC_INTEGRITY_HMAC;
}
file->temp_output =
iostream_temp_create_named(_file->fs->temp_path_prefix,
IOSTREAM_TEMP_FLAG_TRY_FD_DUP,
fs_file_path(_file));
_file->output = o_stream_create_encrypt(file->temp_output,
file->fs->enc_algo, file->fs->keys.public_key,
flags);
}
struct istream *
i_stream_create_fs_file(struct fs_file **file, size_t max_buffer_size)
{
struct fs_file_istream *fstream;
struct istream *input;
fstream = i_new(struct fs_file_istream, 1);
fstream->file = *file;
fstream->istream.iostream.close = i_stream_fs_file_close;
fstream->istream.max_buffer_size = max_buffer_size;
fstream->istream.read = i_stream_fs_file_read;
fstream->istream.stream_size_passthrough = TRUE;
fstream->istream.istream.blocking =
((*file)->flags & FS_OPEN_FLAG_ASYNC) == 0;
fstream->istream.istream.seekable =
((*file)->flags & FS_OPEN_FLAG_SEEKABLE) != 0;
input = i_stream_create(&fstream->istream, NULL, -1);
i_stream_set_name(input, fs_file_path(*file));
*file = NULL;
return input;
}
static const char *fs_sis_queue_file_get_path(struct fs_file *_file)
{
struct sis_queue_fs_file *file = (struct sis_queue_fs_file *)_file;
return fs_file_path(file->super);
}
const char *fs_wrapper_file_get_path(struct fs_file *file)
{
return fs_file_path(file->parent);
}
static const char *fs_compress_file_get_path(struct fs_file *_file)
{
struct compress_fs_file *file = (struct compress_fs_file *)_file;
return fs_file_path(file->super);
}
