From: Kai Makisara Apparently `tar' errors out if it cannot perform lseek() against a tape. Work around that in-kernel. Signed-off-by: Kai Makisara Signed-off-by: Andrew Morton --- 25-akpm/drivers/ide/ide-tape.c | 8 +++++++- 25-akpm/drivers/scsi/osst.c | 8 +++++++- 25-akpm/drivers/scsi/st.c | 8 +++++++- 3 files changed, 21 insertions(+), 3 deletions(-) diff -puN drivers/ide/ide-tape.c~make-st-seekable-again drivers/ide/ide-tape.c --- 25/drivers/ide/ide-tape.c~make-st-seekable-again Thu Mar 3 14:54:29 2005 +++ 25-akpm/drivers/ide/ide-tape.c Thu Mar 3 14:54:29 2005 @@ -4100,7 +4100,13 @@ static int idetape_chrdev_open (struct i idetape_pc_t pc; int retval; - nonseekable_open(inode, filp); + /* + * We really want to do nonseekable_open(inode, filp); here, but some + * versions of tar incorrectly call lseek on tapes and bail out if that + * fails. So we disallow pread() and pwrite(), but permit lseeks. + */ + filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE); + #if IDETAPE_DEBUG_LOG printk(KERN_INFO "ide-tape: Reached idetape_chrdev_open\n"); #endif /* IDETAPE_DEBUG_LOG */ diff -puN drivers/scsi/st.c~make-st-seekable-again drivers/scsi/st.c --- 25/drivers/scsi/st.c~make-st-seekable-again Thu Mar 3 14:54:29 2005 +++ 25-akpm/drivers/scsi/st.c Thu Mar 3 14:54:29 2005 @@ -1004,7 +1004,13 @@ static int st_open(struct inode *inode, int dev = TAPE_NR(inode); char *name; - nonseekable_open(inode, filp); + /* + * We really want to do nonseekable_open(inode, filp); here, but some + * versions of tar incorrectly call lseek on tapes and bail out if that + * fails. So we disallow pread() and pwrite(), but permit lseeks. + */ + filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE); + write_lock(&st_dev_arr_lock); if (dev >= st_dev_max || scsi_tapes == NULL || ((STp = scsi_tapes[dev]) == NULL)) { diff -puN drivers/scsi/osst.c~make-st-seekable-again drivers/scsi/osst.c --- 25/drivers/scsi/osst.c~make-st-seekable-again Thu Mar 3 15:29:23 2005 +++ 25-akpm/drivers/scsi/osst.c Thu Mar 3 15:29:44 2005 @@ -4318,7 +4318,13 @@ static int os_scsi_tape_open(struct inod int dev = TAPE_NR(inode); int mode = TAPE_MODE(inode); - nonseekable_open(inode, filp); + /* + * We really want to do nonseekable_open(inode, filp); here, but some + * versions of tar incorrectly call lseek on tapes and bail out if that + * fails. So we disallow pread() and pwrite(), but permit lseeks. + */ + filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE); + write_lock(&os_scsi_tapes_lock); if (dev >= osst_max_dev || os_scsi_tapes == NULL || (STp = os_scsi_tapes[dev]) == NULL || !STp->device) { _