fsi_file_t *
ext2lib_open(fsi_t *fsi, const char *path)
{
ext2_ino_t ino;
ext2_filsys *fs = fsip_fs_data(fsi);
ext2_file_t *f;
fsi_file_t *file;
int err;
err = ext2fs_namei_follow(*fs, EXT2_ROOT_INO, EXT2_ROOT_INO,
path, &ino);
if (err != 0) {
errno = ENOENT;
return (NULL);
}
f = malloc(sizeof (*f));
if (f == NULL)
return (NULL);
err = ext2fs_file_open(*fs, ino, 0, f);
if (err != 0) {
free(f);
errno = EINVAL;
return (NULL);
}
file = fsip_file_alloc(fsi, f);
if (file == NULL)
free(f);
return (file);
}
static errcode_t get_file(ext2_filsys fs, const char * filename,
struct mem_file *ret_file)
{
errcode_t retval;
char *buf;
ext2_file_t e2_file = NULL;
unsigned int got;
struct ext2_inode inode;
ext2_ino_t ino;
ret_file->buf = 0;
ret_file->size = 0;
ret_file->ptr = 0;
retval = ext2fs_namei(fs, EXT2_ROOT_INO, EXT2_ROOT_INO,
filename, &ino);
if (retval)
return retval;
retval = ext2fs_read_inode(fs, ino, &inode);
if (retval)
return retval;
if (inode.i_size_high || (inode.i_size > 65536))
return EFBIG;
buf = malloc(inode.i_size + 1);
if (!buf)
return ENOMEM;
memset(buf, 0, inode.i_size+1);
retval = ext2fs_file_open(fs, ino, 0, &e2_file);
if (retval)
goto errout;
retval = ext2fs_file_read(e2_file, buf, inode.i_size, &got);
if (retval)
goto errout;
retval = ext2fs_file_close(e2_file);
if (retval)
goto errout;
ret_file->buf = buf;
ret_file->size = (int) got;
return 0;
errout:
free(buf);
if (e2_file)
ext2fs_file_close(e2_file);
return retval;
}
static void rdump_symlink(ext2_ino_t ino, struct ext2_inode *inode,
const char *fullname)
{
ext2_file_t e2_file;
char *buf;
errcode_t retval;
buf = malloc(inode->i_size + 1);
if (!buf) {
com_err("rdump", errno, "while allocating for symlink");
goto errout;
}
/* Apparently, this is the right way to detect and handle fast
* symlinks; see do_stat() in debugfs.c. */
if (inode->i_blocks == 0)
strcpy(buf, (char *) inode->i_block);
else {
unsigned bytes = inode->i_size;
char *p = buf;
retval = ext2fs_file_open(current_fs, ino, 0, &e2_file);
if (retval) {
com_err("rdump", retval, "while opening symlink");
goto errout;
}
for (;;) {
unsigned int got;
retval = ext2fs_file_read(e2_file, p, bytes, &got);
if (retval) {
com_err("rdump", retval, "while reading symlink");
goto errout;
}
bytes -= got;
p += got;
if (got == 0 || bytes == 0)
break;
}
buf[inode->i_size] = 0;
retval = ext2fs_file_close(e2_file);
if (retval)
com_err("rdump", retval, "while closing symlink");
}
if (symlink(buf, fullname) == -1) {
com_err("rdump", errno, "while creating symlink %s -> %s", buf, fullname);
goto errout;
}
errout:
free(buf);
}
static void dump_file(const char *cmdname, ext2_ino_t ino, int fd,
int preserve, char *outname)
{
errcode_t retval;
struct ext2_inode inode;
char *buf = 0;
ext2_file_t e2_file;
int nbytes;
unsigned int got, blocksize = current_fs->blocksize;
if (debugfs_read_inode(ino, &inode, cmdname))
return;
retval = ext2fs_file_open(current_fs, ino, 0, &e2_file);
if (retval) {
com_err(cmdname, retval, "while opening ext2 file");
return;
}
retval = ext2fs_get_mem(blocksize, &buf);
if (retval) {
com_err(cmdname, retval, "while allocating memory");
return;
}
while (1) {
retval = ext2fs_file_read(e2_file, buf, blocksize, &got);
if (retval)
com_err(cmdname, retval, "while reading ext2 file");
if (got == 0)
break;
nbytes = write(fd, buf, got);
if ((unsigned) nbytes != got)
com_err(cmdname, errno, "while writing file");
}
if (buf)
ext2fs_free_mem(&buf);
retval = ext2fs_file_close(e2_file);
if (retval) {
com_err(cmdname, retval, "while closing ext2 file");
return;
}
if (preserve)
fix_perms("dump_file", &inode, fd, outname);
else if (fd != 1)
close(fd);
return;
}
static errcode_t
ext2fs_inline_data_file_expand(ext2_filsys fs, ext2_ino_t ino,
struct ext2_inode *inode, char *buf, size_t size)
{
ext2_file_t e2_file;
errcode_t retval;
/* Update inode */
if (EXT2_HAS_INCOMPAT_FEATURE(fs->super,
EXT3_FEATURE_INCOMPAT_EXTENTS)) {
int i;
struct ext3_extent_header *eh;
eh = (struct ext3_extent_header *) &inode->i_block[0];
eh->eh_depth = 0;
eh->eh_entries = 0;
eh->eh_magic = ext2fs_cpu_to_le16(EXT3_EXT_MAGIC);
i = (sizeof(inode->i_block) - sizeof(*eh)) /
sizeof(struct ext3_extent);
eh->eh_max = ext2fs_cpu_to_le16(i);
inode->i_flags |= EXT4_EXTENTS_FL;
}
inode->i_flags &= ~EXT4_INLINE_DATA_FL;
inode->i_size = 0;
retval = ext2fs_write_inode(fs, ino, inode);
if (retval)
return retval;
/* Write out the block buffer */
retval = ext2fs_file_open(fs, ino, EXT2_FILE_WRITE, &e2_file);
if (retval)
return retval;
retval = ext2fs_file_write(e2_file, buf, size, 0);
ext2fs_file_close(e2_file);
return retval;
}
/* Name: tail()
*
* Description:
*
* This function displays the last lines at the end of a file in an ext2
* file system.
*
* Algorithm:
*
* Get the directory and basename of the file
* Determine the inode number for the file
* Open the file for reading
* Skip to the last block in the file
* While we have not found the last num_lines of newline characters
* Skip backwards in the file one block and read it
* Display the contents of the block from that point on.
* Display the rest of the file if not contained in the block
* Save the current location of the file.
* If we are following the file as it grows
* While forever
* Sleep
* Re-read the inode for the file
* If the size has changed
* Display the file from the saved point on
* Save the current location of the file.
*
*
* Global Variables:
*
* None
*
* Arguments:
*
* ext2_filsys *fs; Our filesystem
* ext2_ino_t root; The root directory inode number
* char *input; The name of the input file to tail
* int num_lines; The number of lines to display
* int follow; Flag indicating if the we should follow any
* new contents to the file.
* int sleep_int; The number of seconds to sleep between checking
* for new lines
* char *cur_filesys
*
* Return Values:
*
* 0 - the last number of lines was displayed correctly.
* an error occurred.
*
* Author: Keith W. Sheffield
* Date: 08/07/2002
*
* Modification History:
*
* MM/DD/YY Name Description
*/
static long
tail(ext2_filsys *fs_ptr, ext2_ino_t root, char *input, int num_lines,
int follow, int sleep_int, char *cur_filesys)
{
ext2_filsys fs = *fs_ptr;
ext2_ino_t cwd;
ext2_ino_t tail_ino;
ext2_ino_t t_tail_ino;
char *tail_dir;
char *tail_name;
long retval;
char buf[BLK_SIZE];
unsigned int bytes_to_read;
unsigned int bytes_read;
char *ptr;
struct ext2_inode inode;
ext2_file_t tail_fd;
ext2_off_t offset;
ext2_off_t cur_pos;
if (get_file_parts(fs, root, input, &cwd, &tail_dir, &tail_name))
{
ext2fs_close(fs);
return(-1);
}
/* get the inode number for the source file */
if ((retval = ext2fs_namei(fs, cwd, cwd, tail_name, &tail_ino)))
{
fprintf(stderr, "%s: file %s\n",error_message(retval),
tail_name);
return(retval);
}
/* open the file */
if ((retval = ext2fs_file_open(fs, tail_ino, 0, &tail_fd)))
{
fputs(error_message(retval), stderr);
return retval;
}
/* get the length of the file and determine where to start reading */
inode.i_size = offset = ext2fs_file_get_size(tail_fd);
bytes_to_read = offset % BLK_SIZE;
if (bytes_to_read == 0)
bytes_to_read = BLK_SIZE;
offset -= bytes_to_read;
if (((int32_t)offset) < 0)
offset = 0;
do
{
/* seek to the start of the last block in the file */
if ((retval = ext2fs_file_lseek(tail_fd, offset, EXT2_SEEK_SET, NULL)))
{
fputs(error_message(retval), stderr);
return retval;
}
/* read the last block in the file */
if ((retval = ext2fs_file_read(tail_fd, buf, bytes_to_read,
&bytes_read)))
{
fputs(error_message(retval), stderr);
return retval;
}
if (bytes_to_read != bytes_read)
{
fputs("error reading file\n", stderr);
return(-1);
}
ptr = buf + bytes_read - 1;
while (bytes_to_read--)
{
if (*ptr == '\n' && num_lines-- == 0)
{
/* if the newline wasn't the last character in the buffer, then
* print what's remaining.
*/
if (bytes_to_read != bytes_read - 1)
{
ptr++;
if (0 > write(1, ptr, bytes_read - bytes_to_read - 1))
{
perror("writing bytes to stdout");
return -1;
}
}
offset = 0; /* make sure we break out of the main loop */
break;
}
ptr--;
}
offset -= (offset < BLK_SIZE) ? offset : BLK_SIZE;
bytes_to_read = BLK_SIZE;
}
while (offset > 0);
/* if we are here and have any lines left, we hit the beginning, so
* dump the rest of what's in memory out.
*/
if (num_lines > 0)
{
if (0 > write(1, buf, bytes_read)) {
perror("writing bytes to stdout");
return -1;
}
}
/* retreive the current position in the file */
if ((retval = ext2fs_file_lseek(tail_fd, 0, EXT2_SEEK_CUR, &cur_pos)))
{
fputs(error_message(retval), stderr);
return retval;
}
/* ok, if we are before the end of the file, then dump the rest of it */
if (cur_pos < inode.i_size)
{
if ((retval = read_to_eof(tail_fd, 1, cur_pos, &cur_pos)))
{
return retval;
}
}
if ((retval = ext2fs_file_close(tail_fd)))
{
fputs(error_message(retval), stderr);
return retval;
}
if (follow)
{
while(1)
{
sleep(sleep_int);
/* I don't know how to force a re-read of the file system info yet,
* so, just close the file system and reopen it.
*/
ext2fs_close(fs);
if ((retval = open_filesystem(cur_filesys, &fs, &root, 0)))
{
*fs_ptr = NULL;
fprintf(stderr, "%s: %s\n", error_message(retval), cur_filesys);
return retval;
}
*fs_ptr = fs;
/* if we are following the name, find the directory and file name
* again.
*/
if (follow == FOLLOW_NAME)
{
cwd = root;
if (tail_dir != NULL && *tail_dir != '\0' &&
strcmp(tail_dir, ",") != 0 &&
(retval = change_cwd(fs, root, &cwd, tail_dir)))
{
fprintf(stderr, "Error changing to directory %s\n",
tail_dir);
return(retval);
}
/* get the inode number for the source file */
if ((retval = ext2fs_namei(fs, cwd, cwd, tail_name,
&t_tail_ino)))
{
fprintf(stderr, "%s: file %s\n",error_message(retval),
tail_name);
return(retval);
}
/* if we are dealing with a new file, then start from the
* beginning.
*/
if (t_tail_ino != tail_ino)
{
tail_ino = t_tail_ino;
cur_pos = 0;
}
}
if ((retval = ext2fs_read_inode(fs, tail_ino, &inode)))
{
fputs(error_message(retval), stderr);
return retval;
}
if (inode.i_size > cur_pos)
{
if ((retval = retrieve_data(fs, tail_ino, 1, NULL, 0, cur_pos,
&cur_pos)))
{
fputs(error_message(retval), stderr);
return retval;
}
}
else if (inode.i_size < cur_pos)
{
/* the file was truncated, so bail */
return(0);
}
}
}
return(0);
}
static errcode_t copy_file(ext2_filsys fs, int fd, ext2_ino_t newfile,
int bufsize, int make_holes)
{
ext2_file_t e2_file;
errcode_t retval, close_ret;
int got;
unsigned int written;
char *buf;
char *ptr;
char *zero_buf;
int cmp;
retval = ext2fs_file_open(fs, newfile,
EXT2_FILE_WRITE, &e2_file);
if (retval)
return retval;
retval = ext2fs_get_mem(bufsize, &buf);
if (retval) {
com_err("copy_file", retval, "can't allocate buffer\n");
goto out_close;
}
/* This is used for checking whether the whole block is zero */
retval = ext2fs_get_memzero(bufsize, &zero_buf);
if (retval) {
com_err("copy_file", retval, "can't allocate zero buffer\n");
goto out_free_buf;
}
while (1) {
got = read(fd, buf, bufsize);
if (got == 0)
break;
if (got < 0) {
retval = errno;
goto fail;
}
ptr = buf;
/* Sparse copy */
if (make_holes) {
/* Check whether all is zero */
cmp = memcmp(ptr, zero_buf, got);
if (cmp == 0) {
/* The whole block is zero, make a hole */
retval = ext2fs_file_lseek(e2_file, got,
EXT2_SEEK_CUR,
NULL);
if (retval)
goto fail;
got = 0;
}
}
/* Normal copy */
while (got > 0) {
retval = ext2fs_file_write(e2_file, ptr,
got, &written);
if (retval)
goto fail;
got -= written;
ptr += written;
}
}
fail:
ext2fs_free_mem(&zero_buf);
out_free_buf:
ext2fs_free_mem(&buf);
out_close:
close_ret = ext2fs_file_close(e2_file);
if (retval == 0)
retval = close_ret;
return retval;
}
static int ext2_copy(disk_t *disk_car, const partition_t *partition, dir_data_t *dir_data, const file_info_t *file)
{
int error=0;
FILE *f_out;
const struct ext2_dir_struct *ls = (const struct ext2_dir_struct *)dir_data->private_dir_data;
char *new_file;
f_out=fopen_local(&new_file, dir_data->local_dir, dir_data->current_directory);
if(!f_out)
{
log_critical("Can't create file %s: %s\n", new_file, strerror(errno));
free(new_file);
return -4;
}
{
errcode_t retval;
struct ext2_inode inode;
char buffer[8192];
ext2_file_t e2_file;
if (ext2fs_read_inode(ls->current_fs, file->st_ino, &inode)!=0)
{
free(new_file);
fclose(f_out);
return -1;
}
retval = ext2fs_file_open(ls->current_fs, file->st_ino, 0, &e2_file);
if (retval) {
log_error("Error while opening ext2 file %s\n", dir_data->current_directory);
free(new_file);
fclose(f_out);
return -2;
}
while (1)
{
int nbytes;
unsigned int got;
retval = ext2fs_file_read(e2_file, buffer, sizeof(buffer), &got);
if (retval)
{
log_error("Error while reading ext2 file %s\n", dir_data->current_directory);
error = -3;
}
if (got == 0)
break;
nbytes = fwrite(buffer, 1, got, f_out);
if ((unsigned) nbytes != got)
{
log_error("Error while writing file %s\n", new_file);
error = -5;
}
}
retval = ext2fs_file_close(e2_file);
if (retval)
{
log_error("Error while closing ext2 file\n");
error = -6;
}
fclose(f_out);
set_date(new_file, file->td_atime, file->td_mtime);
(void)set_mode(new_file, file->st_mode);
}
free(new_file);
return error;
}
