From: Kai Makisara <kai.makisara@kolumbus.fi>
Apparently `tar' errors out if it cannot perform lseek() against a tape. Work
around that in-kernel.
Signed-off-by: Kai Makisara <kai.makisara@kolumbus.fi>
Signed-off-by: Andrew Morton <akpm@osdl.org>
---
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 2005-03-07 20:41:21.000000000 -0800
+++ 25-akpm/drivers/ide/ide-tape.c 2005-03-07 21:14:37.000000000 -0800
@@ -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 2005-03-07 20:41:21.000000000 -0800
+++ 25-akpm/drivers/scsi/st.c 2005-03-07 20:41:21.000000000 -0800
@@ -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 2005-03-07 20:41:21.000000000 -0800
+++ 25-akpm/drivers/scsi/osst.c 2005-03-07 20:41:21.000000000 -0800
@@ -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) {
_