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author | Denys Vlasenko <vda.linux@googlemail.com> | 2015-07-19 23:12:51 +0200 |
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committer | Denys Vlasenko <vda.linux@googlemail.com> | 2015-07-19 23:12:51 +0200 |
commit | ce193f809b32368796a3aacf2ac8ba277f4c102a (patch) | |
tree | 6528caca18ddaf19d1326329ee4ab83dcd46f1ee /e2fsprogs/old_e2fsprogs/ext2fs/fileio.c | |
parent | d840c5d139cfa50fbe4f6f67c178b0edf0c690c8 (diff) | |
download | busybox-ce193f809b32368796a3aacf2ac8ba277f4c102a.tar.gz |
Remove old_e2fsprogs/*
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'e2fsprogs/old_e2fsprogs/ext2fs/fileio.c')
-rw-r--r-- | e2fsprogs/old_e2fsprogs/ext2fs/fileio.c | 377 |
1 files changed, 0 insertions, 377 deletions
diff --git a/e2fsprogs/old_e2fsprogs/ext2fs/fileio.c b/e2fsprogs/old_e2fsprogs/ext2fs/fileio.c deleted file mode 100644 index 5a5ad3ef8..000000000 --- a/e2fsprogs/old_e2fsprogs/ext2fs/fileio.c +++ /dev/null @@ -1,377 +0,0 @@ -/* vi: set sw=4 ts=4: */ -/* - * fileio.c --- Simple file I/O routines - * - * Copyright (C) 1997 Theodore Ts'o. - * - * %Begin-Header% - * This file may be redistributed under the terms of the GNU Public - * License. - * %End-Header% - */ - -#include <stdio.h> -#include <string.h> -#if HAVE_UNISTD_H -#include <unistd.h> -#endif - -#include "ext2_fs.h" -#include "ext2fs.h" - -struct ext2_file { - errcode_t magic; - ext2_filsys fs; - ext2_ino_t ino; - struct ext2_inode inode; - int flags; - __u64 pos; - blk_t blockno; - blk_t physblock; - char *buf; -}; - -#define BMAP_BUFFER (file->buf + fs->blocksize) - -errcode_t ext2fs_file_open2(ext2_filsys fs, ext2_ino_t ino, - struct ext2_inode *inode, - int flags, ext2_file_t *ret) -{ - ext2_file_t file; - errcode_t retval; - - /* - * Don't let caller create or open a file for writing if the - * filesystem is read-only. - */ - if ((flags & (EXT2_FILE_WRITE | EXT2_FILE_CREATE)) && - !(fs->flags & EXT2_FLAG_RW)) - return EXT2_ET_RO_FILSYS; - - retval = ext2fs_get_mem(sizeof(struct ext2_file), &file); - if (retval) - return retval; - - memset(file, 0, sizeof(struct ext2_file)); - file->magic = EXT2_ET_MAGIC_EXT2_FILE; - file->fs = fs; - file->ino = ino; - file->flags = flags & EXT2_FILE_MASK; - - if (inode) { - memcpy(&file->inode, inode, sizeof(struct ext2_inode)); - } else { - retval = ext2fs_read_inode(fs, ino, &file->inode); - if (retval) - goto fail; - } - - retval = ext2fs_get_mem(fs->blocksize * 3, &file->buf); - if (retval) - goto fail; - - *ret = file; - return 0; - -fail: - ext2fs_free_mem(&file->buf); - ext2fs_free_mem(&file); - return retval; -} - -errcode_t ext2fs_file_open(ext2_filsys fs, ext2_ino_t ino, - int flags, ext2_file_t *ret) -{ - return ext2fs_file_open2(fs, ino, NULL, flags, ret); -} - -/* - * This function returns the filesystem handle of a file from the structure - */ -ext2_filsys ext2fs_file_get_fs(ext2_file_t file) -{ - if (file->magic != EXT2_ET_MAGIC_EXT2_FILE) - return 0; - return file->fs; -} - -/* - * This function flushes the dirty block buffer out to disk if - * necessary. - */ -errcode_t ext2fs_file_flush(ext2_file_t file) -{ - errcode_t retval; - ext2_filsys fs; - - EXT2_CHECK_MAGIC(file, EXT2_ET_MAGIC_EXT2_FILE); - fs = file->fs; - - if (!(file->flags & EXT2_FILE_BUF_VALID) || - !(file->flags & EXT2_FILE_BUF_DIRTY)) - return 0; - - /* - * OK, the physical block hasn't been allocated yet. - * Allocate it. - */ - if (!file->physblock) { - retval = ext2fs_bmap(fs, file->ino, &file->inode, - BMAP_BUFFER, file->ino ? BMAP_ALLOC : 0, - file->blockno, &file->physblock); - if (retval) - return retval; - } - - retval = io_channel_write_blk(fs->io, file->physblock, - 1, file->buf); - if (retval) - return retval; - - file->flags &= ~EXT2_FILE_BUF_DIRTY; - - return retval; -} - -/* - * This function synchronizes the file's block buffer and the current - * file position, possibly invalidating block buffer if necessary - */ -static errcode_t sync_buffer_position(ext2_file_t file) -{ - blk_t b; - errcode_t retval; - - b = file->pos / file->fs->blocksize; - if (b != file->blockno) { - retval = ext2fs_file_flush(file); - if (retval) - return retval; - file->flags &= ~EXT2_FILE_BUF_VALID; - } - file->blockno = b; - return 0; -} - -/* - * This function loads the file's block buffer with valid data from - * the disk as necessary. - * - * If dontfill is true, then skip initializing the buffer since we're - * going to be replacing its entire contents anyway. If set, then the - * function basically only sets file->physblock and EXT2_FILE_BUF_VALID - */ -#define DONTFILL 1 -static errcode_t load_buffer(ext2_file_t file, int dontfill) -{ - ext2_filsys fs = file->fs; - errcode_t retval; - - if (!(file->flags & EXT2_FILE_BUF_VALID)) { - retval = ext2fs_bmap(fs, file->ino, &file->inode, - BMAP_BUFFER, 0, file->blockno, - &file->physblock); - if (retval) - return retval; - if (!dontfill) { - if (file->physblock) { - retval = io_channel_read_blk(fs->io, - file->physblock, - 1, file->buf); - if (retval) - return retval; - } else - memset(file->buf, 0, fs->blocksize); - } - file->flags |= EXT2_FILE_BUF_VALID; - } - return 0; -} - - -errcode_t ext2fs_file_close(ext2_file_t file) -{ - errcode_t retval; - - EXT2_CHECK_MAGIC(file, EXT2_ET_MAGIC_EXT2_FILE); - - retval = ext2fs_file_flush(file); - - ext2fs_free_mem(&file->buf); - ext2fs_free_mem(&file); - - return retval; -} - - -errcode_t ext2fs_file_read(ext2_file_t file, void *buf, - unsigned int wanted, unsigned int *got) -{ - ext2_filsys fs; - errcode_t retval = 0; - unsigned int start, c, count = 0; - __u64 left; - char *ptr = (char *) buf; - - EXT2_CHECK_MAGIC(file, EXT2_ET_MAGIC_EXT2_FILE); - fs = file->fs; - - while ((file->pos < EXT2_I_SIZE(&file->inode)) && (wanted > 0)) { - retval = sync_buffer_position(file); - if (retval) - goto fail; - retval = load_buffer(file, 0); - if (retval) - goto fail; - - start = file->pos % fs->blocksize; - c = fs->blocksize - start; - if (c > wanted) - c = wanted; - left = EXT2_I_SIZE(&file->inode) - file->pos; - if (c > left) - c = left; - - memcpy(ptr, file->buf+start, c); - file->pos += c; - ptr += c; - count += c; - wanted -= c; - } - -fail: - if (got) - *got = count; - return retval; -} - - -errcode_t ext2fs_file_write(ext2_file_t file, const void *buf, - unsigned int nbytes, unsigned int *written) -{ - ext2_filsys fs; - errcode_t retval = 0; - unsigned int start, c, count = 0; - const char *ptr = (const char *) buf; - - EXT2_CHECK_MAGIC(file, EXT2_ET_MAGIC_EXT2_FILE); - fs = file->fs; - - if (!(file->flags & EXT2_FILE_WRITE)) - return EXT2_ET_FILE_RO; - - while (nbytes > 0) { - retval = sync_buffer_position(file); - if (retval) - goto fail; - - start = file->pos % fs->blocksize; - c = fs->blocksize - start; - if (c > nbytes) - c = nbytes; - - /* - * We only need to do a read-modify-update cycle if - * we're doing a partial write. - */ - retval = load_buffer(file, (c == fs->blocksize)); - if (retval) - goto fail; - - file->flags |= EXT2_FILE_BUF_DIRTY; - memcpy(file->buf+start, ptr, c); - file->pos += c; - ptr += c; - count += c; - nbytes -= c; - } - -fail: - if (written) - *written = count; - return retval; -} - -errcode_t ext2fs_file_llseek(ext2_file_t file, __u64 offset, - int whence, __u64 *ret_pos) -{ - EXT2_CHECK_MAGIC(file, EXT2_ET_MAGIC_EXT2_FILE); - - if (whence == EXT2_SEEK_SET) - file->pos = offset; - else if (whence == EXT2_SEEK_CUR) - file->pos += offset; - else if (whence == EXT2_SEEK_END) - file->pos = EXT2_I_SIZE(&file->inode) + offset; - else - return EXT2_ET_INVALID_ARGUMENT; - - if (ret_pos) - *ret_pos = file->pos; - - return 0; -} - -errcode_t ext2fs_file_lseek(ext2_file_t file, ext2_off_t offset, - int whence, ext2_off_t *ret_pos) -{ - __u64 loffset, ret_loffset; - errcode_t retval; - - loffset = offset; - retval = ext2fs_file_llseek(file, loffset, whence, &ret_loffset); - if (ret_pos) - *ret_pos = (ext2_off_t) ret_loffset; - return retval; -} - - -/* - * This function returns the size of the file, according to the inode - */ -errcode_t ext2fs_file_get_lsize(ext2_file_t file, __u64 *ret_size) -{ - if (file->magic != EXT2_ET_MAGIC_EXT2_FILE) - return EXT2_ET_MAGIC_EXT2_FILE; - *ret_size = EXT2_I_SIZE(&file->inode); - return 0; -} - -/* - * This function returns the size of the file, according to the inode - */ -ext2_off_t ext2fs_file_get_size(ext2_file_t file) -{ - __u64 size; - - if (ext2fs_file_get_lsize(file, &size)) - return 0; - if ((size >> 32) != 0) - return 0; - return size; -} - -/* - * This function sets the size of the file, truncating it if necessary - * - * XXX still need to call truncate - */ -errcode_t ext2fs_file_set_size(ext2_file_t file, ext2_off_t size) -{ - errcode_t retval; - EXT2_CHECK_MAGIC(file, EXT2_ET_MAGIC_EXT2_FILE); - - file->inode.i_size = size; - file->inode.i_size_high = 0; - if (file->ino) { - retval = ext2fs_write_inode(file->fs, file->ino, &file->inode); - if (retval) - return retval; - } - - /* - * XXX truncate inode if necessary - */ - - return 0; -} |