From: Mingming Cao <cmm@us.ibm.com>
Only allow application to modify the file's reservation window size when fs is
mounted with reservation and the operation is performed on regular files.
---
25-akpm/fs/ext3/ioctl.c | 10 ++++++++--
1 files changed, 8 insertions(+), 2 deletions(-)
diff -puN fs/ext3/ioctl.c~ext3-reservation-file-ioctl-fix fs/ext3/ioctl.c
--- 25/fs/ext3/ioctl.c~ext3-reservation-file-ioctl-fix 2004-04-23 23:08:44.169833016 -0700
+++ 25-akpm/fs/ext3/ioctl.c 2004-04-23 23:08:44.172832560 -0700
@@ -153,9 +153,15 @@ flags_err:
}
#endif
case EXT3_IOC_GETRSVSZ:
- rsv_window_size = atomic_read(&ei->i_rsv_window.rsv_goal_size);
- return put_user(rsv_window_size, (int *)arg);
+ if (test_opt(inode->i_sb, RESERVATION) && S_ISREG(inode->i_mode)) {
+ rsv_window_size = atomic_read(&ei->i_rsv_window.rsv_goal_size);
+ return put_user(rsv_window_size, (int *)arg);
+ }
+ return -ENOTTY;
case EXT3_IOC_SETRSVSZ:
+ if (!test_opt(inode->i_sb, RESERVATION) ||!S_ISREG(inode->i_mode))
+ return -ENOTTY;
+
if (IS_RDONLY(inode))
return -EROFS;
_