From ce193f809b32368796a3aacf2ac8ba277f4c102a Mon Sep 17 00:00:00 2001 From: Denys Vlasenko Date: Sun, 19 Jul 2015 23:12:51 +0200 Subject: Remove old_e2fsprogs/* Signed-off-by: Denys Vlasenko --- e2fsprogs/old_e2fsprogs/ext2fs/unix_io.c | 703 ------------------------------- 1 file changed, 703 deletions(-) delete mode 100644 e2fsprogs/old_e2fsprogs/ext2fs/unix_io.c (limited to 'e2fsprogs/old_e2fsprogs/ext2fs/unix_io.c') diff --git a/e2fsprogs/old_e2fsprogs/ext2fs/unix_io.c b/e2fsprogs/old_e2fsprogs/ext2fs/unix_io.c deleted file mode 100644 index 3c95829f0..000000000 --- a/e2fsprogs/old_e2fsprogs/ext2fs/unix_io.c +++ /dev/null @@ -1,703 +0,0 @@ -/* vi: set sw=4 ts=4: */ -/* - * unix_io.c --- This is the Unix (well, really POSIX) implementation - * of the I/O manager. - * - * Implements a one-block write-through cache. - * - * Includes support for Windows NT support under Cygwin. - * - * Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, - * 2002 by Theodore Ts'o. - * - * %Begin-Header% - * This file may be redistributed under the terms of the GNU Public - * License. - * %End-Header% - */ - -#include -#include -#if HAVE_UNISTD_H -#include -#endif -#if HAVE_ERRNO_H -#include -#endif -#include -#include -#ifdef __linux__ -#include -#endif -#if HAVE_SYS_STAT_H -#include -#endif -#if HAVE_SYS_TYPES_H -#include -#endif -#include - -#include "ext2_fs.h" -#include "ext2fs.h" - -/* - * For checking structure magic numbers... - */ - -#define EXT2_CHECK_MAGIC(struct, code) \ - if ((struct)->magic != (code)) return (code) - -struct unix_cache { - char *buf; - unsigned long block; - int access_time; - unsigned dirty:1; - unsigned in_use:1; -}; - -#define CACHE_SIZE 8 -#define WRITE_DIRECT_SIZE 4 /* Must be smaller than CACHE_SIZE */ -#define READ_DIRECT_SIZE 4 /* Should be smaller than CACHE_SIZE */ - -struct unix_private_data { - int magic; - int dev; - int flags; - int access_time; - ext2_loff_t offset; - struct unix_cache cache[CACHE_SIZE]; -}; - -static errcode_t unix_open(const char *name, int flags, io_channel *channel); -static errcode_t unix_close(io_channel channel); -static errcode_t unix_set_blksize(io_channel channel, int blksize); -static errcode_t unix_read_blk(io_channel channel, unsigned long block, - int count, void *data); -static errcode_t unix_write_blk(io_channel channel, unsigned long block, - int count, const void *data); -static errcode_t unix_flush(io_channel channel); -static errcode_t unix_write_byte(io_channel channel, unsigned long offset, - int size, const void *data); -static errcode_t unix_set_option(io_channel channel, const char *option, - const char *arg); - -static void reuse_cache(io_channel channel, struct unix_private_data *data, - struct unix_cache *cache, unsigned long block); - -/* __FreeBSD_kernel__ is defined by GNU/kFreeBSD - the FreeBSD kernel - * does not know buffered block devices - everything is raw. */ -#if defined(__CYGWIN__) || defined(__FreeBSD__) || defined(__FreeBSD_kernel__) -#define NEED_BOUNCE_BUFFER -#else -#undef NEED_BOUNCE_BUFFER -#endif - -static struct struct_io_manager struct_unix_manager = { - EXT2_ET_MAGIC_IO_MANAGER, - "Unix I/O Manager", - unix_open, - unix_close, - unix_set_blksize, - unix_read_blk, - unix_write_blk, - unix_flush, -#ifdef NEED_BOUNCE_BUFFER - 0, -#else - unix_write_byte, -#endif - unix_set_option -}; - -io_manager unix_io_manager = &struct_unix_manager; - -/* - * Here are the raw I/O functions - */ -#ifndef NEED_BOUNCE_BUFFER -static errcode_t raw_read_blk(io_channel channel, - struct unix_private_data *data, - unsigned long block, - int count, void *buf) -{ - errcode_t retval; - ssize_t size; - ext2_loff_t location; - int actual = 0; - - size = (count < 0) ? -count : count * channel->block_size; - location = ((ext2_loff_t) block * channel->block_size) + data->offset; - if (ext2fs_llseek(data->dev, location, SEEK_SET) != location) { - retval = errno ? errno : EXT2_ET_LLSEEK_FAILED; - goto error_out; - } - actual = read(data->dev, buf, size); - if (actual != size) { - if (actual < 0) - actual = 0; - retval = EXT2_ET_SHORT_READ; - goto error_out; - } - return 0; - -error_out: - memset((char *) buf+actual, 0, size-actual); - if (channel->read_error) - retval = (channel->read_error)(channel, block, count, buf, - size, actual, retval); - return retval; -} -#else /* NEED_BOUNCE_BUFFER */ -/* - * Windows and FreeBSD block devices only allow sector alignment IO in offset and size - */ -static errcode_t raw_read_blk(io_channel channel, - struct unix_private_data *data, - unsigned long block, - int count, void *buf) -{ - errcode_t retval; - size_t size, alignsize, fragment; - ext2_loff_t location; - int total = 0, actual; -#define BLOCKALIGN 512 - char sector[BLOCKALIGN]; - - size = (count < 0) ? -count : count * channel->block_size; - location = ((ext2_loff_t) block * channel->block_size) + data->offset; -#ifdef DEBUG - printf("count=%d, size=%d, block=%d, blk_size=%d, location=%lx\n", - count, size, block, channel->block_size, location); -#endif - if (ext2fs_llseek(data->dev, location, SEEK_SET) != location) { - retval = errno ? errno : EXT2_ET_LLSEEK_FAILED; - goto error_out; - } - fragment = size % BLOCKALIGN; - alignsize = size - fragment; - if (alignsize) { - actual = read(data->dev, buf, alignsize); - if (actual != alignsize) - goto short_read; - } - if (fragment) { - actual = read(data->dev, sector, BLOCKALIGN); - if (actual != BLOCKALIGN) - goto short_read; - memcpy(buf+alignsize, sector, fragment); - } - return 0; - -short_read: - if (actual>0) - total += actual; - retval = EXT2_ET_SHORT_READ; - -error_out: - memset((char *) buf+total, 0, size-actual); - if (channel->read_error) - retval = (channel->read_error)(channel, block, count, buf, - size, actual, retval); - return retval; -} -#endif - -static errcode_t raw_write_blk(io_channel channel, - struct unix_private_data *data, - unsigned long block, - int count, const void *buf) -{ - ssize_t size; - ext2_loff_t location; - int actual = 0; - errcode_t retval; - - if (count == 1) - size = channel->block_size; - else { - if (count < 0) - size = -count; - else - size = count * channel->block_size; - } - - location = ((ext2_loff_t) block * channel->block_size) + data->offset; - if (ext2fs_llseek(data->dev, location, SEEK_SET) != location) { - retval = errno ? errno : EXT2_ET_LLSEEK_FAILED; - goto error_out; - } - - actual = write(data->dev, buf, size); - if (actual != size) { - retval = EXT2_ET_SHORT_WRITE; - goto error_out; - } - return 0; - -error_out: - if (channel->write_error) - retval = (channel->write_error)(channel, block, count, buf, - size, actual, retval); - return retval; -} - - -/* - * Here we implement the cache functions - */ - -/* Allocate the cache buffers */ -static errcode_t alloc_cache(io_channel channel, - struct unix_private_data *data) -{ - errcode_t retval; - struct unix_cache *cache; - int i; - - data->access_time = 0; - for (i=0, cache = data->cache; i < CACHE_SIZE; i++, cache++) { - cache->block = 0; - cache->access_time = 0; - cache->dirty = 0; - cache->in_use = 0; - if ((retval = ext2fs_get_mem(channel->block_size, - &cache->buf))) - return retval; - } - return 0; -} - -/* Free the cache buffers */ -static void free_cache(struct unix_private_data *data) -{ - struct unix_cache *cache; - int i; - - data->access_time = 0; - for (i=0, cache = data->cache; i < CACHE_SIZE; i++, cache++) { - cache->block = 0; - cache->access_time = 0; - cache->dirty = 0; - cache->in_use = 0; - ext2fs_free_mem(&cache->buf); - cache->buf = 0; - } -} - -#ifndef NO_IO_CACHE -/* - * Try to find a block in the cache. If the block is not found, and - * eldest is a non-zero pointer, then fill in eldest with the cache - * entry to that should be reused. - */ -static struct unix_cache *find_cached_block(struct unix_private_data *data, - unsigned long block, - struct unix_cache **eldest) -{ - struct unix_cache *cache, *unused_cache, *oldest_cache; - int i; - - unused_cache = oldest_cache = 0; - for (i=0, cache = data->cache; i < CACHE_SIZE; i++, cache++) { - if (!cache->in_use) { - if (!unused_cache) - unused_cache = cache; - continue; - } - if (cache->block == block) { - cache->access_time = ++data->access_time; - return cache; - } - if (!oldest_cache || - (cache->access_time < oldest_cache->access_time)) - oldest_cache = cache; - } - if (eldest) - *eldest = (unused_cache) ? unused_cache : oldest_cache; - return 0; -} - -/* - * Reuse a particular cache entry for another block. - */ -static void reuse_cache(io_channel channel, struct unix_private_data *data, - struct unix_cache *cache, unsigned long block) -{ - if (cache->dirty && cache->in_use) - raw_write_blk(channel, data, cache->block, 1, cache->buf); - - cache->in_use = 1; - cache->dirty = 0; - cache->block = block; - cache->access_time = ++data->access_time; -} - -/* - * Flush all of the blocks in the cache - */ -static errcode_t flush_cached_blocks(io_channel channel, - struct unix_private_data *data, - int invalidate) - -{ - struct unix_cache *cache; - errcode_t retval, retval2; - int i; - - retval2 = 0; - for (i=0, cache = data->cache; i < CACHE_SIZE; i++, cache++) { - if (!cache->in_use) - continue; - - if (invalidate) - cache->in_use = 0; - - if (!cache->dirty) - continue; - - retval = raw_write_blk(channel, data, - cache->block, 1, cache->buf); - if (retval) - retval2 = retval; - else - cache->dirty = 0; - } - return retval2; -} -#endif /* NO_IO_CACHE */ - -static errcode_t unix_open(const char *name, int flags, io_channel *channel) -{ - io_channel io = NULL; - struct unix_private_data *data = NULL; - errcode_t retval; - int open_flags; - struct stat st; -#ifdef __linux__ - struct utsname ut; -#endif - - if (name == 0) - return EXT2_ET_BAD_DEVICE_NAME; - retval = ext2fs_get_mem(sizeof(struct struct_io_channel), &io); - if (retval) - return retval; - memset(io, 0, sizeof(struct struct_io_channel)); - io->magic = EXT2_ET_MAGIC_IO_CHANNEL; - retval = ext2fs_get_mem(sizeof(struct unix_private_data), &data); - if (retval) - goto cleanup; - - io->manager = unix_io_manager; - retval = ext2fs_get_mem(strlen(name)+1, &io->name); - if (retval) - goto cleanup; - - strcpy(io->name, name); - io->private_data = data; - io->block_size = 1024; - io->read_error = 0; - io->write_error = 0; - io->refcount = 1; - - memset(data, 0, sizeof(struct unix_private_data)); - data->magic = EXT2_ET_MAGIC_UNIX_IO_CHANNEL; - - if ((retval = alloc_cache(io, data))) - goto cleanup; - - open_flags = (flags & IO_FLAG_RW) ? O_RDWR : O_RDONLY; -#ifdef CONFIG_LFS - data->dev = open64(io->name, open_flags); -#else - data->dev = open(io->name, open_flags); -#endif - if (data->dev < 0) { - retval = errno; - goto cleanup; - } - -#ifdef __linux__ -#undef RLIM_INFINITY -#if (defined(__alpha__) || ((defined(__sparc__) || defined(__mips__)) && (SIZEOF_LONG == 4))) -#define RLIM_INFINITY ((unsigned long)(~0UL>>1)) -#else -#define RLIM_INFINITY (~0UL) -#endif - /* - * Work around a bug in 2.4.10-2.4.18 kernels where writes to - * block devices are wrongly getting hit by the filesize - * limit. This workaround isn't perfect, since it won't work - * if glibc wasn't built against 2.2 header files. (Sigh.) - * - */ - if ((flags & IO_FLAG_RW) && - (uname(&ut) == 0) && - ((ut.release[0] == '2') && (ut.release[1] == '.') && - (ut.release[2] == '4') && (ut.release[3] == '.') && - (ut.release[4] == '1') && (ut.release[5] >= '0') && - (ut.release[5] < '8')) && - (fstat(data->dev, &st) == 0) && - (S_ISBLK(st.st_mode))) { - struct rlimit rlim; - - rlim.rlim_cur = rlim.rlim_max = (unsigned long) RLIM_INFINITY; - setrlimit(RLIMIT_FSIZE, &rlim); - getrlimit(RLIMIT_FSIZE, &rlim); - if (((unsigned long) rlim.rlim_cur) < - ((unsigned long) rlim.rlim_max)) { - rlim.rlim_cur = rlim.rlim_max; - setrlimit(RLIMIT_FSIZE, &rlim); - } - } -#endif - *channel = io; - return 0; - -cleanup: - if (data) { - free_cache(data); - ext2fs_free_mem(&data); - } - ext2fs_free_mem(&io); - return retval; -} - -static errcode_t unix_close(io_channel channel) -{ - struct unix_private_data *data; - errcode_t retval = 0; - - EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL); - data = (struct unix_private_data *) channel->private_data; - EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_UNIX_IO_CHANNEL); - - if (--channel->refcount > 0) - return 0; - -#ifndef NO_IO_CACHE - retval = flush_cached_blocks(channel, data, 0); -#endif - - if (close(data->dev) < 0) - retval = errno; - free_cache(data); - - ext2fs_free_mem(&channel->private_data); - ext2fs_free_mem(&channel->name); - ext2fs_free_mem(&channel); - return retval; -} - -static errcode_t unix_set_blksize(io_channel channel, int blksize) -{ - struct unix_private_data *data; - errcode_t retval; - - EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL); - data = (struct unix_private_data *) channel->private_data; - EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_UNIX_IO_CHANNEL); - - if (channel->block_size != blksize) { -#ifndef NO_IO_CACHE - if ((retval = flush_cached_blocks(channel, data, 0))) - return retval; -#endif - - channel->block_size = blksize; - free_cache(data); - if ((retval = alloc_cache(channel, data))) - return retval; - } - return 0; -} - - -static errcode_t unix_read_blk(io_channel channel, unsigned long block, - int count, void *buf) -{ - struct unix_private_data *data; - struct unix_cache *cache, *reuse[READ_DIRECT_SIZE]; - errcode_t retval; - char *cp; - int i, j; - - EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL); - data = (struct unix_private_data *) channel->private_data; - EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_UNIX_IO_CHANNEL); - -#ifdef NO_IO_CACHE - return raw_read_blk(channel, data, block, count, buf); -#else - /* - * If we're doing an odd-sized read or a very large read, - * flush out the cache and then do a direct read. - */ - if (count < 0 || count > WRITE_DIRECT_SIZE) { - if ((retval = flush_cached_blocks(channel, data, 0))) - return retval; - return raw_read_blk(channel, data, block, count, buf); - } - - cp = buf; - while (count > 0) { - /* If it's in the cache, use it! */ - if ((cache = find_cached_block(data, block, &reuse[0]))) { -#ifdef DEBUG - printf("Using cached block %lu\n", block); -#endif - memcpy(cp, cache->buf, channel->block_size); - count--; - block++; - cp += channel->block_size; - continue; - } - /* - * Find the number of uncached blocks so we can do a - * single read request - */ - for (i=1; i < count; i++) - if (find_cached_block(data, block+i, &reuse[i])) - break; -#ifdef DEBUG - printf("Reading %d blocks starting at %lu\n", i, block); -#endif - if ((retval = raw_read_blk(channel, data, block, i, cp))) - return retval; - - /* Save the results in the cache */ - for (j=0; j < i; j++) { - count--; - cache = reuse[j]; - reuse_cache(channel, data, cache, block++); - memcpy(cache->buf, cp, channel->block_size); - cp += channel->block_size; - } - } - return 0; -#endif /* NO_IO_CACHE */ -} - -static errcode_t unix_write_blk(io_channel channel, unsigned long block, - int count, const void *buf) -{ - struct unix_private_data *data; - struct unix_cache *cache, *reuse; - errcode_t retval = 0; - const char *cp; - int writethrough; - - EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL); - data = (struct unix_private_data *) channel->private_data; - EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_UNIX_IO_CHANNEL); - -#ifdef NO_IO_CACHE - return raw_write_blk(channel, data, block, count, buf); -#else - /* - * If we're doing an odd-sized write or a very large write, - * flush out the cache completely and then do a direct write. - */ - if (count < 0 || count > WRITE_DIRECT_SIZE) { - if ((retval = flush_cached_blocks(channel, data, 1))) - return retval; - return raw_write_blk(channel, data, block, count, buf); - } - - /* - * For a moderate-sized multi-block write, first force a write - * if we're in write-through cache mode, and then fill the - * cache with the blocks. - */ - writethrough = channel->flags & CHANNEL_FLAGS_WRITETHROUGH; - if (writethrough) - retval = raw_write_blk(channel, data, block, count, buf); - - cp = buf; - while (count > 0) { - cache = find_cached_block(data, block, &reuse); - if (!cache) { - cache = reuse; - reuse_cache(channel, data, cache, block); - } - memcpy(cache->buf, cp, channel->block_size); - cache->dirty = !writethrough; - count--; - block++; - cp += channel->block_size; - } - return retval; -#endif /* NO_IO_CACHE */ -} - -static errcode_t unix_write_byte(io_channel channel, unsigned long offset, - int size, const void *buf) -{ - struct unix_private_data *data; - errcode_t retval = 0; - ssize_t actual; - - EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL); - data = (struct unix_private_data *) channel->private_data; - EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_UNIX_IO_CHANNEL); - -#ifndef NO_IO_CACHE - /* - * Flush out the cache completely - */ - if ((retval = flush_cached_blocks(channel, data, 1))) - return retval; -#endif - - if (lseek(data->dev, offset + data->offset, SEEK_SET) < 0) - return errno; - - actual = write(data->dev, buf, size); - if (actual != size) - return EXT2_ET_SHORT_WRITE; - - return 0; -} - -/* - * Flush data buffers to disk. - */ -static errcode_t unix_flush(io_channel channel) -{ - struct unix_private_data *data; - errcode_t retval = 0; - - EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL); - data = (struct unix_private_data *) channel->private_data; - EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_UNIX_IO_CHANNEL); - -#ifndef NO_IO_CACHE - retval = flush_cached_blocks(channel, data, 0); -#endif - fsync(data->dev); - return retval; -} - -static errcode_t unix_set_option(io_channel channel, const char *option, - const char *arg) -{ - struct unix_private_data *data; - unsigned long tmp; - char *end; - - EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL); - data = (struct unix_private_data *) channel->private_data; - EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_UNIX_IO_CHANNEL); - - if (!strcmp(option, "offset")) { - if (!arg) - return EXT2_ET_INVALID_ARGUMENT; - - tmp = strtoul(arg, &end, 0); - if (*end) - return EXT2_ET_INVALID_ARGUMENT; - data->offset = tmp; - return 0; - } - return EXT2_ET_INVALID_ARGUMENT; -} -- cgit v1.2.3