// store file buffer into local storage
// if success == TRUE then "buf" successfuly stored on disc
void cache_mng_store_file_buf (CacheMng *cmng, fuse_ino_t ino, size_t size, off_t off, unsigned char *buf,
cache_mng_on_store_file_buf_cb on_store_file_buf_cb, void *ctx)
{
struct _CacheContext *context;
struct _CacheEntry *entry;
ssize_t res;
int fd;
char path[PATH_MAX];
guint64 old_length, new_length;
guint64 range_size;
time_t now;
range_size = (guint64)(off + size);
// limit the number of cache checks
now = time (NULL);
if (cmng->check_time < now && now - cmng->check_time >= 10) {
// remove data until we have at least size bytes of max_size left
while (cmng->max_size < cmng->size + size && g_queue_peek_tail (cmng->q_lru)) {
entry = (struct _CacheEntry *) g_queue_peek_tail (cmng->q_lru);
cache_mng_remove_file (cmng, entry->ino);
}
cmng->check_time = now;
}
context = cache_context_create (size, ctx);
context->cb.store_cb = on_store_file_buf_cb;
cache_mng_file_name (cmng, path, sizeof (path), ino);
fd = open (path, O_WRONLY|O_CREAT, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
if (fd < 0) {
LOG_err (CMNG_LOG, INO_H"Failed to create / open file for writing! Path: %s", INO_T (ino), path);
if (context->cb.store_cb)
context->cb.store_cb (FALSE, context->user_ctx);
cache_context_destroy (context);
return;
}
res = pwrite(fd, buf, size, off);
close (fd);
entry = g_hash_table_lookup (cmng->h_entries, GUINT_TO_POINTER (ino));
if (!entry) {
entry = cache_entry_create (ino);
g_queue_push_head (cmng->q_lru, entry);
entry->ll_lru = g_queue_peek_head_link (cmng->q_lru);
g_hash_table_insert (cmng->h_entries, GUINT_TO_POINTER (ino), entry);
}
old_length = range_length (entry->avail_range);
range_add (entry->avail_range, off, range_size);
new_length = range_length (entry->avail_range);
if (new_length >= old_length)
cmng->size += new_length - old_length;
else {
LOG_err (CMNG_LOG, INO_H"New length is less than the old length !: %"G_GUINT64_FORMAT" <= %"G_GUINT64_FORMAT,
INO_T (ino), new_length, old_length);
}
// update modification time
entry->modification_time = time (NULL);
context->success = (res == (ssize_t) size);
LOG_debug (CMNG_LOG, INO_H"Written [%"OFF_FMT":%zu] bytes, result: %s",
INO_T (ino), off, size, context->success ? "OK" : "Failed");
context->ev = event_new (application_get_evbase (cmng->app), -1, 0,
cache_write_cb, context);
// fire this event at once
event_active (context->ev, 0, 0);
event_add (context->ev, NULL);
}
static void fileio_read_on_head_cb (HttpConnection *con, void *ctx, gboolean success,
G_GNUC_UNUSED const gchar *buf, G_GNUC_UNUSED size_t buf_len,
struct evkeyvalq *headers)
{
FileReadData *rdata = (FileReadData *) ctx;
const char *content_len_header;
DirTree *dtree;
// release HttpConnection
http_connection_release (con);
if (!success) {
LOG_err (FIO_LOG, INO_CON_H"Failed to get HEAD from server !", INO_T (rdata->ino), con);
rdata->on_buffer_read_cb (rdata->ctx, FALSE, NULL, 0);
g_free (rdata);
return;
}
rdata->fop->head_req_sent = TRUE;
// update DirTree
dtree = application_get_dir_tree (rdata->fop->app);
dir_tree_set_entry_exist (dtree, rdata->ino);
// consistency checking:
// 1. check local and remote file sizes
content_len_header = http_find_header (headers, "Content-Length");
if (content_len_header) {
guint64 local_size = 0;
gint64 size = 0;
size = strtoll ((char *)content_len_header, NULL, 10);
if (size < 0) {
LOG_err (FIO_LOG, INO_CON_H"Header contains incorrect file size!", INO_T (rdata->ino), con);
size = 0;
}
rdata->fop->file_size = size;
LOG_debug (FIO_LOG, INO_H"Remote file size: %"G_GUINT64_FORMAT, INO_T (rdata->ino), rdata->fop->file_size);
local_size = cache_mng_get_file_length (application_get_cache_mng (rdata->fop->app), rdata->ino);
if (local_size != rdata->fop->file_size) {
LOG_debug (FIO_LOG, INO_H"Local and remote file sizes do not match, invalidating local cached file!",
INO_T (rdata->ino));
cache_mng_remove_file (application_get_cache_mng (rdata->fop->app), rdata->ino);
}
}
// 2. use one of the following ways to check that local and remote files are identical
// if versioning is enabled: compare version IDs
// if bucket has versioning disabled: compare MD5 sums
if (conf_get_boolean (application_get_conf (rdata->fop->app), "s3.versioning")) {
const char *versioning_header = http_find_header (headers, "x-amz-version-id");
if (versioning_header) {
const gchar *local_version_id = cache_mng_get_version_id (application_get_cache_mng (rdata->fop->app), rdata->ino);
if (local_version_id && !strcmp (local_version_id, versioning_header)) {
LOG_debug (FIO_LOG, INO_H"Both version IDs match, using local cached file!", INO_T (rdata->ino));
} else {
LOG_debug (FIO_LOG, INO_H"Version IDs do not match, invalidating local cached file!: %s %s",
INO_T (rdata->ino), local_version_id, versioning_header);
cache_mng_remove_file (application_get_cache_mng (rdata->fop->app), rdata->ino);
}
// header was not found
} else {
LOG_debug (FIO_LOG, INO_H"Versioning header was not found, invalidating local cached file!", INO_T (rdata->ino));
cache_mng_remove_file (application_get_cache_mng (rdata->fop->app), rdata->ino);
}
//check for MD5
} else {
const char *md5_header = http_find_header (headers, "x-amz-meta-md5");
if (md5_header) {
gchar *md5str = NULL;
// at this point we have both remote and local MD5 sums
if (cache_mng_get_md5 (application_get_cache_mng (rdata->fop->app), rdata->ino, &md5str)) {
if (!strncmp (md5_header, md5str, 32)) {
LOG_debug (FIO_LOG, INO_H"MD5 sums match, using local cached file!", INO_T (rdata->ino));
} else {
LOG_debug (FIO_LOG, INO_H"MD5 sums do not match, invalidating local cached file!", INO_T (rdata->ino));
cache_mng_remove_file (application_get_cache_mng (rdata->fop->app), rdata->ino);
}
} else {
LOG_debug (FIO_LOG, INO_H"Failed to get local MD5 sum, invalidating local cached file!", INO_T (rdata->ino));
cache_mng_remove_file (application_get_cache_mng (rdata->fop->app), rdata->ino);
}
if (md5str)
g_free (md5str);
// header was not found
} else {
LOG_debug (FIO_LOG, INO_H"MD5 sum header was not found, invalidating local cached file!", INO_T (rdata->ino));
cache_mng_remove_file (application_get_cache_mng (rdata->fop->app), rdata->ino);
}
}
// resume downloading file
fileio_read_get_buf (rdata);
}
