/* returns 0 on success, errno on failure */
int
ReallyRead(DirHandle * file, int block, char *data)
{
FdHandle_t *fdP;
int code;
ssize_t nBytes;
errno = 0;
fdP = IH_OPEN(file->dirh_handle);
if (fdP == NULL) {
code = errno;
return code;
}
if (FDH_SEEK(fdP, ((afs_foff_t)block) * AFS_PAGESIZE, SEEK_SET) < 0) {
code = errno;
FDH_REALLYCLOSE(fdP);
return code;
}
nBytes = FDH_READ(fdP, data, (afs_fsize_t) AFS_PAGESIZE);
if (nBytes != AFS_PAGESIZE) {
if (nBytes < 0)
code = errno;
else
code = EIO;
FDH_REALLYCLOSE(fdP);
return code;
}
FDH_CLOSE(fdP);
return 0;
}
/* returns 0 on success, errno on failure */
int
ReallyRead(DirHandle * file, int block, char *data)
{
int code;
FdHandle_t *fdP;
fdP = IH_OPEN(file->dirh_handle);
if (fdP == NULL) {
code = errno;
ViceLog(0,
("ReallyRead(): open failed device %X inode %s errno %d\n",
file->dirh_handle->ih_dev, PrintInode(NULL,
file->dirh_handle->
ih_ino), code));
return code;
}
if (FDH_SEEK(fdP, block * PAGESIZE, SEEK_SET) < 0) {
code = errno;
ViceLog(0,
("ReallyRead(): lseek failed device %X inode %s errno %d\n",
file->dirh_handle->ih_dev, PrintInode(NULL,
file->dirh_handle->
ih_ino), code));
FDH_REALLYCLOSE(fdP);
return code;
}
code = FDH_READ(fdP, data, PAGESIZE);
if (code != PAGESIZE) {
if (code < 0)
code = errno;
else
code = EIO;
ViceLog(0,
("ReallyRead(): read failed device %X inode %s errno %d\n",
file->dirh_handle->ih_dev, PrintInode(NULL,
file->dirh_handle->
ih_ino), code));
FDH_REALLYCLOSE(fdP);
return code;
}
FDH_CLOSE(fdP);
return 0;
}
static int
DumpFile(int dumpfd, int vnode, FdHandle_t * handleP, struct VnodeDiskObject *v)
{
int code = 0, failed_seek = 0, failed_write = 0;
afs_int32 pad = 0;
afs_int32 offset = 0;
afs_sfsize_t n, nbytes, howMany, howBig;
byte *p;
#ifndef AFS_NT40_ENV
struct afs_stat status;
#endif
afs_sfsize_t size, tmpsize;
#ifdef AFS_AIX_ENV
#include <sys/statfs.h>
struct statfs tstatfs;
#endif
if (verbose)
fprintf(stderr, "dumping file for vnode %d\n", vnode);
#ifdef AFS_NT40_ENV
howBig = _filelength(handleP->fd_fd);
howMany = 4096;
#else
afs_fstat(handleP->fd_fd, &status);
howBig = status.st_size;
#ifdef AFS_AIX_ENV
/* Unfortunately in AIX valuable fields such as st_blksize are
* gone from the stat structure.
*/
fstatfs(handleP->fd_fd, &tstatfs);
howMany = tstatfs.f_bsize;
#else
howMany = status.st_blksize;
#endif /* AFS_AIX_ENV */
#endif /* AFS_NT40_ENV */
size = FDH_SIZE(handleP);
if (verbose)
fprintf(stderr, " howBig = %u, howMany = %u, fdh size = %u\n",
howBig, howMany, size);
#ifdef AFS_LARGEFILE_ENV
{
afs_uint32 hi, lo;
SplitInt64(size, hi, lo);
if (hi == 0L) {
code = DumpInt32(dumpfd, 'f', lo);
} else {
code = DumpDouble(dumpfd, 'h', hi, lo);
}
}
#else /* !AFS_LARGEFILE_ENV */
code = DumpInt32(dumpfd, 'f', size);
#endif /* !AFS_LARGEFILE_ENV */
if (code) {
return VOLSERDUMPERROR;
}
p = (unsigned char *)malloc(howMany);
if (!p) {
fprintf(stderr, "out of memory!\n");
return VOLSERDUMPERROR;
}
/* loop through whole file, while we still have bytes left, and no errors, in chunks of howMany bytes */
for (nbytes = size; (nbytes && !failed_write); nbytes -= howMany) {
if (nbytes < howMany)
howMany = nbytes;
/* Read the data - unless we know we can't */
n = (failed_seek ? 0 : FDH_READ(handleP, p, howMany));
/* If read any good data and we null padded previously, log the
* amount that we had null padded.
*/
if ((n > 0) && pad) {
fprintf(stderr, "Null padding file %d bytes at offset %u\n", pad,
offset);
pad = 0;
}
/* If didn't read enough data, null padd the rest of the buffer. This
* can happen if, for instance, the media has some bad spots. We don't
* want to quit the dump, so we start null padding.
*/
if (n < howMany) {
if (verbose) fprintf(stderr, " read %u instead of %u bytes.\n", n, howMany);
/* Record the read error */
if (n < 0) {
n = 0;
fprintf(stderr, "Error %d reading inode %s for vnode %d\n",
errno, PrintInode(NULL, handleP->fd_ih->ih_ino),
vnode);
} else if (!pad) {
fprintf(stderr, "Error reading inode %s for vnode %d\n",
PrintInode(NULL, handleP->fd_ih->ih_ino), vnode);
}
/* Pad the rest of the buffer with zeros. Remember offset we started
* padding. Keep total tally of padding.
*/
memset(p + n, 0, howMany - n);
if (!pad)
offset = (howBig - nbytes) + n;
pad += (howMany - n);
/* Now seek over the data we could not get. An error here means we
* can't do the next read.
*/
failed_seek = FDH_SEEK(handleP, ((size - nbytes) + howMany), SEEK_SET);
if (failed_seek != ((size - nbytes) + howMany)) {
if (failed_seek < 0) {
fprintf(stderr,
"Error %d seeking in inode %s for vnode %d\n",
errno, PrintInode(NULL, handleP->fd_ih->ih_ino),
vnode);
} else {
fprintf(stderr,
"Error seeking in inode %s for vnode %d\n",
PrintInode(NULL, handleP->fd_ih->ih_ino), vnode);
failed_seek = -1;
}
} else {
failed_seek = 0;
}
}
/* Now write the data out */
if (write(dumpfd, (char *)p, howMany) != howMany)
failed_write = VOLSERDUMPERROR;
}
if (pad) { /* Any padding we hadn't reported yet */
fprintf(stderr, "Null padding file: %d bytes at offset %u\n", pad,
offset);
}
free(p);
return failed_write;
}