/**
* write() equivalent
*
* @param path the path of the file to be written
* @param buf buffer holding write() data
* @param size how many bytes should be written (size of *buf)
* @param offset starting of the write
* @param fi struct fuse_file_info used for open() flags
* @return(0 on success, -errno otherwise)
*/
int tagsistant_write(const char *path, const char *buf, size_t size, off_t offset, struct fuse_file_info *fi)
{
int res = 0, tagsistant_errno = 0, fh = 0;
TAGSISTANT_START("WRITE on %s [size: %lu offset: %lu]", path, (unsigned long) size, (long unsigned int) offset);
tagsistant_querytree *qtree = tagsistant_querytree_new(path, 0, 0, 1, 1);
// -- malformed --
if (QTREE_IS_MALFORMED(qtree))
TAGSISTANT_ABORT_OPERATION(ENOENT);
// -- alias --
if (QTREE_IS_ALIAS(qtree) && qtree->alias) {
res = size;
gchar *_buf = g_strndup(buf, size);
// end the string at the first carriage return or line feed character
gchar *path_ptr = rindex(_buf, '\n');
if (path_ptr) *path_ptr = '/';
path_ptr = rindex(_buf, '\r');
if (path_ptr) *path_ptr = '/';
// remove double slashes
GRegex *rx = g_regex_new("//", 0, 0, NULL);
gchar *_buf2 = g_regex_replace(rx, _buf, -1, 0, "/", 0, NULL);
g_regex_unref(rx);
g_free(_buf);
_buf = _buf2;
// get the size of the buffer
size_t max_size = MIN(size, TAGSISTANT_ALIAS_MAX_LENGTH - 1);
size_t real_size = MIN(max_size, strlen(_buf));
// copy the buffer to a temporary variable
gchar *value = g_strndup(_buf, real_size);
// save the buffer on disk
tagsistant_sql_alias_set(qtree->dbi, qtree->alias, value);
g_free(value);
g_free(_buf);
} else
// -- object on disk --
if (QTREE_POINTS_TO_OBJECT(qtree)) {
if (!qtree->full_archive_path) {
dbg('F', LOG_ERR, "Null qtree->full_archive_path");
TAGSISTANT_ABORT_OPERATION(EFAULT);
}
#if TAGSISTANT_ENABLE_FILE_HANDLE_CACHING
if (fi->fh) {
tagsistant_get_file_handle(fi, fh);
res = pwrite(fh, buf, size, offset);
tagsistant_errno = errno;
}
if ((-1 == res) || (0 == fh)) {
if (fh) close(fh);
fh = open(qtree->full_archive_path, fi->flags|O_WRONLY);
if (fh) res = pwrite(fh, buf, size, offset);
else res = -1;
tagsistant_errno = errno;
}
tagsistant_set_file_handle(fi, fh);
#else
fh = open(qtree->full_archive_path, fi->flags|O_WRONLY);
if (fh) {
res = pwrite(fh, buf, size, offset);
tagsistant_errno = errno;
close(fh);
} else {
TAGSISTANT_ABORT_OPERATION(errno);
}
#endif
}
// -- tags --
// -- stats --
// -- relations --
else TAGSISTANT_ABORT_OPERATION(EROFS);
// dbg('F', LOG_ERR, "Yeah!");
TAGSISTANT_EXIT_OPERATION:
if ( res == -1 ) {
TAGSISTANT_STOP_ERROR("WRITE %s (%s) (%s): %d %d: %s", path, qtree->full_archive_path, tagsistant_querytree_type(qtree), res, tagsistant_errno, strerror(tagsistant_errno));
tagsistant_querytree_destroy(qtree, TAGSISTANT_ROLLBACK_TRANSACTION);
return (-tagsistant_errno);
} else {
TAGSISTANT_STOP_OK("WRITE %s (%s): OK", path, tagsistant_querytree_type(qtree));
tagsistant_querytree_destroy(qtree, TAGSISTANT_COMMIT_TRANSACTION);
return (res);
}
}
/**
* open() equivalent
*
* @param path the path to be open()ed
* @param fi struct fuse_file_info holding open() flags
* @return(0 on success, -errno otherwise)
*/
int tagsistant_open(const char *path, struct fuse_file_info *fi)
{
int res = -1, tagsistant_errno = ENOENT;
TAGSISTANT_START("OPEN on %s", path);
// build querytree
tagsistant_querytree *qtree = tagsistant_querytree_new(path, 0, 0, 1, 0);
// -- malformed --
if (QTREE_IS_MALFORMED(qtree))
TAGSISTANT_ABORT_OPERATION(ENOENT);
// -- error message --
if (qtree->error_message && g_regex_match_simple("@/error$", path, G_REGEX_EXTENDED, 0)) {
res = 1;
tagsistant_errno = 0;
goto TAGSISTANT_EXIT_OPERATION;
}
// -- object --
else if (QTREE_POINTS_TO_OBJECT(qtree)) {
if (tagsistant_is_tags_list_file(qtree)) {
res = open(tagsistant.tags, fi->flags|O_RDONLY);
tagsistant_errno = errno;
goto TAGSISTANT_EXIT_OPERATION;
}
if (!qtree->full_archive_path) {
dbg('F', LOG_ERR, "Null qtree->full_archive_path");
TAGSISTANT_ABORT_OPERATION(EFAULT);
}
res = open(qtree->full_archive_path, fi->flags /*|O_RDONLY */);
tagsistant_errno = errno;
if (-1 != res) {
#if TAGSISTANT_ENABLE_FILE_HANDLE_CACHING
tagsistant_set_file_handle(fi, res);
dbg('F', LOG_INFO, "Caching %" PRIu64 " = open(%s)", fi->fh, path);
// fprintf(stderr, "Opened FD %lu\n", fi->fh);
#else
close(res);
#endif
tagsistant_querytree_check_tagging_consistency(qtree);
if (QTREE_IS_TAGGABLE(qtree)) {
if ((fi->flags & O_WRONLY) || (fi->flags & O_RDWR)) {
// invalidate the checksum
dbg('2', LOG_INFO, "Invalidating checksum on %s", path);
tagsistant_invalidate_object_checksum(qtree->inode, qtree->dbi);
} else {
fi->keep_cache = 1;
}
}
} else {
tagsistant_set_file_handle(fi, 0);
}
}
// -- stats --
else if (QTREE_IS_STATS(qtree)) {
res = open(tagsistant.tags, fi->flags|O_RDONLY);
tagsistant_set_file_handle(fi, res);
tagsistant_errno = errno;
fi->keep_cache = 0;
}
// -- alias --
else if (QTREE_IS_ALIAS(qtree) && qtree->alias) {
if (tagsistant_sql_alias_exists(qtree->dbi, qtree->alias)) {
res = 0;
tagsistant_errno = 0;
} else {
TAGSISTANT_ABORT_OPERATION(ENOENT);
}
}
// -- tags --
// -- relations --
else TAGSISTANT_ABORT_OPERATION(EROFS);
TAGSISTANT_EXIT_OPERATION:
if ( res == -1 ) {
TAGSISTANT_STOP_ERROR("OPEN on %s (%s) (%s): %d %d: %s", path, qtree->full_archive_path, tagsistant_querytree_type(qtree), res, tagsistant_errno, strerror(tagsistant_errno));
tagsistant_querytree_destroy(qtree, TAGSISTANT_ROLLBACK_TRANSACTION);
return (-tagsistant_errno);
} else {
TAGSISTANT_STOP_OK("OPEN on %s (%s): OK", path, tagsistant_querytree_type(qtree));
tagsistant_querytree_destroy(qtree, TAGSISTANT_COMMIT_TRANSACTION);
return (0);
}
}
