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cio_file.c
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/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* Chunk I/O
* =========
* Copyright 2018-2019 Eduardo Silva <[email protected]>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <limits.h>
#include <chunkio/chunkio.h>
#include <chunkio/chunkio_compat.h>
#include <chunkio/cio_crc32.h>
#include <chunkio/cio_chunk.h>
#include <chunkio/cio_file.h>
#include <chunkio/cio_file_native.h>
#include <chunkio/cio_file_st.h>
#include <chunkio/cio_log.h>
#include <chunkio/cio_stream.h>
#include <chunkio/cio_error.h>
#include <chunkio/cio_utils.h>
size_t scio_file_page_size = 0;
char cio_file_init_bytes[] = {
/* file type (2 bytes) */
CIO_FILE_ID_00, CIO_FILE_ID_01,
/* crc32 (4 bytes) in network byte order */
0xff, 0x12, 0xd9, 0x41,
/* padding bytes (we have 16 extra bytes) */
0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00,
0x00,
/* metadata length (2 bytes) */
0x00, 0x00
};
#define ROUND_UP(N, S) ((((N) + (S) - 1) / (S)) * (S))
/* Calculate content checksum in a variable */
void cio_file_calculate_checksum(struct cio_file *cf, crc_t *out)
{
crc_t val;
size_t len;
ssize_t content_length;
unsigned char *in_data;
if (cf->fs_size == 0) {
cio_file_update_size(cf);
}
/* Metadata length header + metadata length + content length */
len = 2;
len += cio_file_st_get_meta_len(cf->map);
content_length = cio_file_st_get_content_len(cf->map,
cf->fs_size,
cf->page_size,
cf->taint_flag);
if (content_length > 0) {
len += content_length;
}
in_data = (unsigned char *) cf->map + CIO_FILE_CONTENT_OFFSET;
val = cio_crc32_update(cf->crc_cur, in_data, len);
*out = val;
}
/* Update crc32 checksum into the memory map */
static void update_checksum(struct cio_file *cf,
unsigned char *data, size_t len)
{
crc_t crc;
crc_t tmp;
if (cf->crc_reset) {
cf->crc_cur = cio_crc32_init();
cio_file_calculate_checksum(cf, &tmp);
cf->crc_cur = tmp;
cf->crc_reset = CIO_FALSE;
}
crc = cio_crc32_update(cf->crc_cur, data, len);
memcpy(cf->map + 2, &crc, sizeof(crc));
cf->crc_cur = crc;
}
/* Finalize CRC32 context and update the memory map */
static void finalize_checksum(struct cio_file *cf)
{
crc_t crc;
crc = cio_crc32_finalize(cf->crc_cur);
crc = htonl(crc);
memcpy(cf->map + 2, &crc, sizeof(crc));
}
/*
* adjust_layout: if metadata has changed, we need to adjust the content
* data and reference pointers.
*/
static int adjust_layout(struct cio_chunk *ch,
struct cio_file *cf, size_t meta_size)
{
cio_file_st_set_meta_len(cf->map, (uint16_t) meta_size);
/* Update checksum */
if (ch->ctx->options.flags & CIO_CHECKSUM) {
/* reset current crc since we are calculating from zero */
cf->crc_cur = cio_crc32_init();
cio_file_calculate_checksum(cf, &cf->crc_cur);
}
/* Sync changes to disk */
cf->synced = CIO_FALSE;
return 0;
}
/* Initialize Chunk header & structure */
static void write_init_header(struct cio_chunk *ch, struct cio_file *cf)
{
memcpy(cf->map, cio_file_init_bytes, sizeof(cio_file_init_bytes));
/* If no checksum is enabled, reset the initial crc32 bytes */
if (!(ch->ctx->options.flags & CIO_CHECKSUM)) {
cf->map[2] = 0;
cf->map[3] = 0;
cf->map[4] = 0;
cf->map[5] = 0;
}
cio_file_st_set_content_len(cf->map, 0);
}
/* Return the available size in the file map to write data */
static size_t get_available_size(struct cio_file *cf, int *meta_len)
{
size_t av;
int metadata_len;
/* Get metadata length */
metadata_len = cio_file_st_get_meta_len(cf->map);
av = cf->alloc_size;
av -= CIO_FILE_HEADER_MIN;
av -= metadata_len;
av -= cf->data_size;
*meta_len = metadata_len;
return av;
}
/*
* For the recently opened or created file, check the structure format
* and validate relevant fields.
*/
static int cio_file_format_check(struct cio_chunk *ch,
struct cio_file *cf, int flags)
{
size_t metadata_length;
ssize_t content_length;
ssize_t logical_length;
unsigned char *p;
crc_t crc_check;
crc_t crc;
(void) flags;
p = (unsigned char *) cf->map;
/* If the file is empty, put the structure on it */
if (cf->fs_size == 0) {
/* check we have write permissions */
if ((cf->flags & CIO_OPEN) == 0) {
cio_log_warn(ch->ctx,
"[cio file] cannot initialize chunk (read-only)");
cio_error_set(ch, CIO_ERR_PERMISSION);
return -1;
}
/* at least we need 24 bytes as allocated space */
if (cf->alloc_size < CIO_FILE_HEADER_MIN) {
cio_log_warn(ch->ctx, "[cio file] cannot initialize chunk");
cio_error_set(ch, CIO_ERR_BAD_LAYOUT);
return -1;
}
/* Initialize init bytes */
write_init_header(ch, cf);
/* Write checksum in context (note: crc32 not finalized) */
if (ch->ctx->options.flags & CIO_CHECKSUM) {
cio_file_calculate_checksum(cf, &cf->crc_cur);
}
}
else {
/* Check first two bytes */
if (p[0] != CIO_FILE_ID_00 || p[1] != CIO_FILE_ID_01) {
cio_log_debug(ch->ctx, "[cio file] invalid header at %s",
ch->name);
cio_error_set(ch, CIO_ERR_BAD_LAYOUT);
return -1;
}
/* Expected / logical file size verification */
content_length = cio_file_st_get_content_len(cf->map,
cf->fs_size,
cf->page_size,
cf->taint_flag);
if (content_length == -1) {
cio_log_debug(ch->ctx, "[cio file] truncated header (%zu / %zu) %s",
cf->fs_size, CIO_FILE_HEADER_MIN, ch->name);
cio_error_set(ch, CIO_ERR_BAD_FILE_SIZE);
return -1;
}
metadata_length = cio_file_st_get_meta_len(cf->map);
logical_length = CIO_FILE_HEADER_MIN +
metadata_length +
content_length;
if (logical_length > cf->fs_size) {
cio_log_debug(ch->ctx, "[cio file] truncated file (%zd / %zd) %s",
cf->fs_size, logical_length, ch->name);
cio_error_set(ch, CIO_ERR_BAD_FILE_SIZE);
return -1;
}
/* Checksum */
if (ch->ctx->options.flags & CIO_CHECKSUM) {
/* Initialize CRC variable */
cf->crc_cur = cio_crc32_init();
/* Get checksum stored in the mmap */
p = (unsigned char *) cio_file_st_get_hash(cf->map);
/* Calculate content checksum */
cio_file_calculate_checksum(cf, &crc);
/* Compare */
crc_check = cio_crc32_finalize(crc);
crc_check = htonl(crc_check);
if (memcmp(p, &crc_check, sizeof(crc_check)) != 0) {
cio_log_info(ch->ctx, "[cio file] invalid crc32 at %s/%s",
ch->name, cf->path);
cio_error_set(ch, CIO_ERR_BAD_CHECKSUM);
return -1;
}
cf->crc_cur = crc;
}
}
return 0;
}
/*
* Unmap the memory for the opened file in question. It make sure
* to sync changes to disk first.
*/
static int munmap_file(struct cio_ctx *ctx, struct cio_chunk *ch)
{
int ret;
struct cio_file *cf;
cf = (struct cio_file *) ch->backend;
if (!cf) {
return -1;
}
/* File not mapped */
if (cf->map == NULL) {
return -1;
}
/* Sync pending changes to disk */
if (cf->synced == CIO_FALSE) {
ret = cio_file_sync(ch);
if (ret == -1) {
cio_log_error(ch->ctx,
"[cio file] error syncing file at "
"%s:%s", ch->st->name, ch->name);
}
}
/* Unmap file */
cio_file_native_unmap(cf);
cf->data_size = 0;
cf->alloc_size = 0;
/* Adjust counters */
cio_chunk_counter_total_up_sub(ctx);
return 0;
}
/*
* This function creates the memory map for the open file descriptor plus
* setup the chunk structure reference.
*/
static int mmap_file(struct cio_ctx *ctx, struct cio_chunk *ch, size_t size)
{
ssize_t content_size;
size_t fs_size;
int ret;
struct cio_file *cf;
cf = (struct cio_file *) ch->backend;
if (cf->map != NULL) {
return CIO_OK;
}
cf->taint_flag = CIO_FALSE;
/*
* 'size' value represents the value of a previous fstat(2) set by a previous
* caller. If the value is greater than zero, just use it, otherwise do a new
* fstat(2) of the file descriptor.
*/
fs_size = 0;
if (size > 0) {
fs_size = size;
}
else {
/* Get file size from the file system */
ret = cio_file_native_get_size(cf, &fs_size);
if (ret != CIO_OK) {
cio_file_report_os_error();
return CIO_ERROR;
}
}
/* If the file is not empty, use file size for the memory map */
if (fs_size > 0) {
size = fs_size;
cf->synced = CIO_TRUE;
}
else if (fs_size == 0) {
/* We can only prepare a file if it has been opened in RW mode */
if ((cf->flags & CIO_OPEN_RW) == 0) {
cio_error_set(ch, CIO_ERR_PERMISSION);
return CIO_CORRUPTED;
}
cf->synced = CIO_FALSE;
/* Adjust size to make room for headers */
if (size < CIO_FILE_HEADER_MIN) {
size += CIO_FILE_HEADER_MIN;
}
/* For empty files, make room in the file system */
size = ROUND_UP(size, ctx->page_size);
ret = cio_file_resize(cf, size);
if (ret != CIO_OK) {
cio_log_error(ctx, "cannot adjust chunk size '%s' to %lu bytes",
cf->path, size);
return CIO_ERROR;
}
cio_log_debug(ctx, "%s:%s adjusting size OK", ch->st->name, ch->name);
}
cf->alloc_size = size;
/* Map the file */
ret = cio_file_native_map(cf, cf->alloc_size);
if (ret != CIO_OK) {
cio_log_error(ctx, "cannot mmap/read chunk '%s'", cf->path);
return CIO_ERROR;
}
/* check content data size */
if (fs_size > 0) {
content_size = cio_file_st_get_content_len(cf->map,
fs_size,
cf->page_size,
cf->taint_flag);
if (content_size == -1) {
cio_error_set(ch, CIO_ERR_BAD_FILE_SIZE);
cio_log_error(ctx, "invalid content size %s", cf->path);
cio_file_native_unmap(cf);
cf->data_size = 0;
cf->alloc_size = 0;
return CIO_CORRUPTED;
}
cf->data_size = content_size;
cf->fs_size = fs_size;
}
else {
cf->data_size = 0;
cf->fs_size = 0;
}
ret = cio_file_format_check(ch, cf, cf->flags);
if (ret != 0) {
cio_log_error(ctx, "format check failed: %s/%s",
ch->st->name, ch->name);
cio_file_native_unmap(cf);
cf->data_size = 0;
return CIO_CORRUPTED;
}
cf->st_content = cio_file_st_get_content(cf->map);
cio_log_debug(ctx, "%s:%s mapped OK", ch->st->name, ch->name);
/* The mmap succeeded, adjust the counters */
cio_chunk_counter_total_up_add(ctx);
return CIO_OK;
}
int cio_file_lookup_user(char *user, void **result)
{
return cio_file_native_lookup_user(user, result);
}
int cio_file_lookup_group(char *group, void **result)
{
return cio_file_native_lookup_group(group, result);
}
int cio_file_read_prepare(struct cio_ctx *ctx, struct cio_chunk *ch)
{
return mmap_file(ctx, ch, 0);
}
int cio_file_content_copy(struct cio_chunk *ch,
void **out_buf, size_t *out_size)
{
int ret;
int set_down = CIO_FALSE;
char *buf;
char *data = NULL;
size_t size;
struct cio_file *cf = ch->backend;
/* If the file content is already up, just do a copy of the memory map */
if (cio_chunk_is_up(ch) == CIO_FALSE) {
ret = cio_chunk_up_force(ch);
if (ret != CIO_OK ){
return CIO_ERROR;
}
set_down = CIO_TRUE;
}
size = cf->data_size;
data = cio_file_st_get_content(cf->map);
if (!data) {
if (set_down == CIO_TRUE) {
cio_chunk_down(ch);
}
return CIO_ERROR;
}
buf = malloc(size + 1);
if (!buf) {
cio_errno();
if (set_down == CIO_TRUE) {
cio_chunk_down(ch);
}
return CIO_ERROR;
}
memcpy(buf, data, size);
buf[size] = '\0';
*out_buf = buf;
*out_size = size;
if (set_down == CIO_TRUE) {
cio_chunk_down(ch);
}
return CIO_OK;
}
/*
* If the maximum number of 'up' chunks is reached, put this chunk
* down (only at open time).
*/
static inline int open_and_up(struct cio_ctx *ctx)
{
if (ctx->total_chunks_up >= ctx->max_chunks_up) {
return CIO_FALSE;
}
return CIO_TRUE;
}
/*
* Fetch the file size regardless of if we opened this file or not.
*/
size_t cio_file_real_size(struct cio_file *cf)
{
size_t file_size;
int ret;
ret = cio_file_native_get_size(cf, &file_size);
if (ret != CIO_OK) {
return 0;
}
return file_size;
}
static int format_acl_error_message(struct cio_ctx *ctx,
struct cio_file *cf,
char *output_buffer,
size_t output_buffer_size)
{
char *connector;
int result;
char *group;
char *user;
user = ctx->options.user;
group = ctx->options.group;
connector = "with group";
if (user == NULL) {
user = "";
connector = "";
}
if (group == NULL) {
group = "";
connector = "";
}
result = snprintf(output_buffer, output_buffer_size - 1,
"cannot change ownership of %s to %s %s %s",
cf->path, user, connector, group);
if (result < 0) {
return CIO_ERROR;
}
return CIO_OK;
}
/*
* Open or create a data file: the following behavior is expected depending
* of the passed flags:
*
* CIO_OPEN | CIO_OPEN_RW:
* - Open for read/write, if the file don't exist, it's created and the
* memory map size is assigned to the given value on 'size'.
*
* CIO_OPEN_RD:
* - If file exists, open it in read-only mode.
*/
struct cio_file *cio_file_open(struct cio_ctx *ctx,
struct cio_stream *st,
struct cio_chunk *ch,
int flags,
size_t size,
int *err)
{
char error_message[256];
char *path;
int ret;
struct cio_file *cf;
(void) size;
ret = cio_file_native_filename_check(ch->name);
if (ret != CIO_OK) {
cio_log_error(ctx, "[cio file] invalid file name");
return NULL;
}
path = cio_file_native_compose_path(ctx->options.root_path, st->name, ch->name);
if (path == NULL) {
return NULL;
}
/* Create file context */
cf = calloc(1, sizeof(struct cio_file));
if (!cf) {
cio_errno();
free(path);
return NULL;
}
cf->fd = -1;
cf->flags = flags;
cf->page_size = cio_getpagesize();
if (ctx->realloc_size_hint > 0) {
cf->realloc_size = ctx->realloc_size_hint;
}
else {
cf->realloc_size = CIO_REALLOC_HINT_MIN;
}
cf->taint_flag = CIO_FALSE;
cf->st_content = NULL;
cf->crc_cur = cio_crc32_init();
cf->path = path;
cf->map = NULL;
ch->backend = cf;
#ifdef _WIN32
cf->backing_file = INVALID_HANDLE_VALUE;
cf->backing_mapping = INVALID_HANDLE_VALUE;
#endif
#if defined (CIO_HAVE_FALLOCATE)
cf->allocate_strategy = CIO_FILE_LINUX_FALLOCATE;
#endif
/* Should we open and put this file up ? */
ret = open_and_up(ctx);
if (ret == CIO_FALSE) {
/* we reached our limit, leave the file 'down' */
cio_file_update_size(cf);
/*
* Due to he current resource limiting logic we could
* get to this point without a file existing so we just
* ignore the error.
*/
return cf;
}
/* Open the file */
ret = cio_file_native_open(cf);
if (ret != CIO_OK) {
free(path);
free(cf);
*err = ret;
return NULL;
}
/* Update the file size field */
ret = cio_file_update_size(cf);
if (ret != CIO_OK) {
cio_file_native_close(cf);
free(path);
free(cf);
*err = ret;
return NULL;
}
/* Set the file ownership and permissions */
ret = cio_file_native_apply_acl_and_settings(ctx, cf);
if (ret != CIO_OK) {
*err = ret;
ret = format_acl_error_message(ctx, cf, error_message, sizeof(error_message));
if (ret != CIO_OK) {
cio_log_error(ctx, "error generating error message for acl failure");
}
else {
cio_log_error(ctx, error_message);
}
cio_file_native_close(cf);
free(path);
free(cf);
return NULL;
}
/* Map the file */
ret = mmap_file(ctx, ch, cf->fs_size);
if (ret == CIO_ERROR || ret == CIO_CORRUPTED || ret == CIO_RETRY) {
cio_file_native_close(cf);
free(path);
free(cf);
*err = ret;
return NULL;
}
*err = CIO_OK;
return cf;
}
/* This function is used to delete a chunk by name, its only purpose is to delete
* chunks that cannnot be loaded (otherwise we would set them down with the delete
* flag set to TRUE).
*/
int cio_file_delete(struct cio_ctx *ctx, struct cio_stream *st, const char *name)
{
char *path;
int ret;
ret = cio_file_native_filename_check((char *) name);
if (ret != CIO_OK) {
cio_log_error(ctx, "[cio file] invalid file name");
return CIO_ERROR;
}
path = cio_file_native_compose_path(ctx->options.root_path, st->name, (char *) name);
if (path == NULL) {
return CIO_ERROR;
}
ret = cio_file_native_delete_by_path(path);
free(path);
return ret;
}
/*
* Put a file content back into memory, only IF it has been set 'down'
* before.
*/
static int _cio_file_up(struct cio_chunk *ch, int enforced)
{
int ret;
struct cio_file *cf = (struct cio_file *) ch->backend;
if (cf->map) {
cio_log_error(ch->ctx, "[cio file] file is already mapped: %s/%s",
ch->st->name, ch->name);
return CIO_ERROR;
}
if (cf->fd > 0) {
cio_log_error(ch->ctx, "[cio file] file descriptor already exists: "
"[fd=%i] %s:%s", cf->fd, ch->st->name, ch->name);
return CIO_ERROR;
}
/*
* Enforced mechanism provides safety based on Chunk I/O storage
* pre-set limits.
*/
if (enforced == CIO_TRUE) {
ret = open_and_up(ch->ctx);
if (ret == CIO_FALSE) {
return CIO_ERROR;
}
}
/* Open file */
ret = cio_file_native_open(cf);
if (ret != CIO_OK) {
cio_log_error(ch->ctx, "[cio file] cannot open chunk: %s/%s",
ch->st->name, ch->name);
return CIO_ERROR;
}
ret = cio_file_update_size(cf);
if (ret != CIO_OK) {
return CIO_ERROR;
}
/*
* Map content:
*
* return values = CIO_OK, CIO_ERROR, CIO_CORRUPTED or CIO_RETRY
*/
ret = mmap_file(ch->ctx, ch, cf->fs_size);
if (ret == CIO_ERROR) {
cio_log_error(ch->ctx, "[cio file] cannot map chunk: %s/%s",
ch->st->name, ch->name);
}
/*
* 'ret' can still be CIO_CORRUPTED or CIO_RETRY on those cases we
* close the file descriptor
*/
if (ret == CIO_CORRUPTED || ret == CIO_RETRY) {
/*
* we just remove resources: close the recently opened file
* descriptor, we never delete the Chunk at this stage since
* the caller must take that action.
*/
cio_file_native_close(cf);
}
return ret;
}
/*
* Load a file using 'enforced' mode: do not load the file in memory
* if we already passed memory or max_chunks_up restrictions.
*/
int cio_file_up(struct cio_chunk *ch)
{
return _cio_file_up(ch, CIO_TRUE);
}
/* Load a file in non-enforced mode. This means it will load the file
* in memory skipping restrictions set by configuration.
*
* The use case of this call is when the caller needs to write data
* to a file which is down due to restrictions. But then the caller
* must put the chunk 'down' again if that was it original status.
*/
int cio_file_up_force(struct cio_chunk *ch)
{
return _cio_file_up(ch, CIO_FALSE);
}
int cio_file_update_size(struct cio_file *cf)
{
int result;
result = cio_file_native_get_size(cf, &cf->fs_size);
if (result != CIO_OK) {
cf->fs_size = 0;
}
return result;
}
/* Release memory and file descriptor resources but keep context */
int cio_file_down(struct cio_chunk *ch)
{
int ret;
struct cio_file *cf;
cf = (struct cio_file *) ch->backend;
if (cf->map == NULL) {
cio_log_error(ch->ctx, "[cio file] file is not mapped: %s/%s",
ch->st->name, ch->name);
return -1;
}
/* unmap memory */
munmap_file(ch->ctx, ch);
/* Allocated map size is zero */
cf->alloc_size = 0;
/* Update the file size */
ret = cio_file_update_size(cf);
if (ret != CIO_OK) {
cio_errno();
}
/* Close file descriptor */
cio_file_native_close(cf);
return 0;
}
void cio_file_close(struct cio_chunk *ch, int delete)
{
int ret;
struct cio_file *cf;
cf = (struct cio_file *) ch->backend;
if (cf == NULL) {
return;
}
/* Safe unmap of the file content */
munmap_file(ch->ctx, ch);
/* Close file descriptor */
cio_file_native_close(cf);
/* Should we delete the content from the file system ? */
if (delete == CIO_TRUE) {
ret = cio_file_native_delete(cf);
if (ret != CIO_OK) {
cio_log_error(ch->ctx,
"[cio file] error deleting file at close %s:%s",
ch->st->name, ch->name);
}
}
free(cf->path);
free(cf);
}
int cio_file_write(struct cio_chunk *ch, const void *buf, size_t count)
{
int ret;
int meta_len;
int pre_content;
size_t av_size;
size_t old_size;
size_t new_size;
struct cio_file *cf;
if (count == 0) {
/* do nothing */
return 0;
}
if (!ch) {
return -1;
}
cf = (struct cio_file *) ch->backend;
if (cio_chunk_is_up(ch) == CIO_FALSE) {
cio_log_error(ch->ctx, "[cio file] file is not mmap()ed: %s:%s",
ch->st->name, ch->name);
return -1;
}
/* get available size */
av_size = get_available_size(cf, &meta_len);
/* validate there is enough space, otherwise resize */
if (av_size < count) {
/* Set the pre-content size (chunk header + metadata) */
pre_content = (CIO_FILE_HEADER_MIN + meta_len);
new_size = cf->alloc_size + cf->realloc_size;
while (new_size < (pre_content + cf->data_size + count)) {
new_size += cf->realloc_size;
}