freebsd-skq/sys/fs/devfs
Konstantin Belousov 7818e0a545 Save previous content of the td_fpop before storing the current
filedescriptor into it. Make sure that td_fpop is NULL when calling
d_mmap from dev_pager_getpages().

Change guards against td_fpop field being non-NULL with private state
for another device, and against sudden clearing the td_fpop. This
could occur when either a driver method calls another driver through
the filedescriptor operation, or a page fault happen while driver is
writing to a memory backed by another driver.

Noted by:	rwatson
Tested by:	rnoland
MFC after:	3 days
2008-09-26 14:50:49 +00:00
..
devfs_devs.c Already initialize the vfs timestamps inside the cdev upon allocation. 2008-09-21 14:02:43 +00:00
devfs_int.h Struct cdev is always the member of the struct cdev_priv. When devfs 2008-06-16 17:34:59 +00:00
devfs_rule.c Get pointer to devfs_ruleset struct after garbage collection has been 2008-06-22 14:34:38 +00:00
devfs_vfsops.c VOP_LOCK1() (and so VOP_LOCK()) and VOP_UNLOCK() are only used in 2008-01-13 14:44:15 +00:00
devfs_vnops.c Save previous content of the td_fpop before storing the current 2008-09-26 14:50:49 +00:00
devfs.h Properly lock the vnode around vgone() calls. 2006-10-18 11:17:14 +00:00