Konstantin Belousov 84110e7e0b Account the writeable shared mappings backed by file in the vnode ...

v_writecount.  Keep the amount of the virtual address space used by
the mappings in the new vm_object un_pager.vnp.writemappings
counter. The vnode v_writecount is incremented when writemappings gets
non-zero value, and decremented when writemappings is returned to
zero.

Writeable shared vnode-backed mappings are accounted for in vm_mmap(),
and vm_map_insert() is instructed to set MAP_ENTRY_VN_WRITECNT flag on
the created map entry.  During deferred map entry deallocation,
vm_map_process_deferred() checks for MAP_ENTRY_VN_WRITECOUNT and
decrements writemappings for the vm object.

Now, the writeable mount cannot be demoted to read-only while
writeable shared mappings of the vnodes from the mount point
exist. Also, execve(2) fails for such files with ETXTBUSY, as it
should be.

Noted by:	tegge
Reviewed by:	tegge (long time ago, early version), alc
Tested by:	pho
MFC after:	3 weeks

2012-02-23 21:07:16 +00:00

..

default_pager.c

Replace pointer to "struct uidinfo" with pointer to "struct ucred"

2010-12-02 17:37:16 +00:00

device_pager.c

Update the device pager interface, while keeping the compatibility

2011-11-15 14:40:00 +00:00

memguard.c

Mark all SYSCTL_NODEs static that have no corresponding SYSCTL_DECLs.

2011-11-07 15:43:11 +00:00

memguard.h

Make memguard(9) capable to guard uma(9) allocations.

2011-10-12 18:08:28 +00:00

phys_pager.c

Remove unneeded includes of <sys/linker_set.h>. Other headers that use

2011-01-11 13:59:06 +00:00

pmap.h

Sort function prototypes.

2011-01-16 20:40:50 +00:00

redzone.c

Mark all SYSCTL_NODEs static that have no corresponding SYSCTL_DECLs.

2011-11-07 15:43:11 +00:00

redzone.h

…

sg_pager.c

Eliminate duplication of the fake page code and zone by the device and sg

2011-03-11 07:07:48 +00:00

swap_pager.c

Remove direct access to si_name.

2012-02-10 12:35:57 +00:00

swap_pager.h

Implement the linprocfs swaps file, providing information about the

2011-08-01 19:12:15 +00:00

uma_core.c

exclude kmem_alloc'ed ARC data buffers from kernel minidumps on amd64

2012-01-27 20:18:31 +00:00

uma_dbg.c

…

uma_dbg.h

…

uma_int.h

1. Prior to r214782, UMA did not support multipage allocations before

2011-05-21 17:43:43 +00:00

uma.h

exclude kmem_alloc'ed ARC data buffers from kernel minidumps on amd64

2012-01-27 20:18:31 +00:00

vm_contig.c

exclude kmem_alloc'ed ARC data buffers from kernel minidumps on amd64

2012-01-27 20:18:31 +00:00

vm_extern.h

Eliminate vm_phys_bootstrap_alloc(). It was a failed attempt at

2011-10-30 05:06:14 +00:00

vm_fault.c

Use the trick of performing the atomic operation on the contained aligned

2011-09-28 14:57:50 +00:00

vm_glue.c

Move kstack_cache_entry into the private header, and make the

2011-12-16 10:56:16 +00:00

vm_init.c

Introduce exec_alloc_args(). The objective being to encapsulate the

2010-07-27 17:31:03 +00:00

vm_kern.c

exclude kmem_alloc'ed ARC data buffers from kernel minidumps on amd64

2012-01-27 20:18:31 +00:00

vm_kern.h

…

vm_map.c

Account the writeable shared mappings backed by file in the vnode

2012-02-23 21:07:16 +00:00

vm_map.h

Account the writeable shared mappings backed by file in the vnode

2012-02-23 21:07:16 +00:00

vm_meter.c

- The previous commit (r228449) accidentally moved the vm.stats.vm.* sysctls

2011-12-14 13:25:00 +00:00

vm_mmap.c

Account the writeable shared mappings backed by file in the vnode

2012-02-23 21:07:16 +00:00

vm_object.c

Do not restart the scan in vm_object_page_clean() on the object

2012-01-04 16:04:20 +00:00

vm_object.h

Account the writeable shared mappings backed by file in the vnode

2012-02-23 21:07:16 +00:00

vm_page.c

exclude kmem_alloc'ed ARC data buffers from kernel minidumps on amd64

2012-01-27 20:18:31 +00:00

vm_page.h

exclude kmem_alloc'ed ARC data buffers from kernel minidumps on amd64

2012-01-27 20:18:31 +00:00

vm_pageout.c

Revert r212360 now that PowerPC can handle large sparse arguments to

2012-01-17 00:31:09 +00:00

vm_pageout.h

vm_pageout_flush() might cache the pages that finished write to the

2010-11-18 21:09:02 +00:00

vm_pager.c

Remove the condition that is always true.

2011-11-15 14:09:53 +00:00

vm_pager.h

Update the device pager interface, while keeping the compatibility

2011-11-15 14:40:00 +00:00

vm_param.h

On Alan's advice, rather than do a wholesale conversion on a single

2010-04-30 00:46:43 +00:00

vm_phys.c

Refactor the code that performs physically contiguous memory allocation,

2011-11-16 16:46:09 +00:00

vm_phys.h

Refactor the code that performs physically contiguous memory allocation,

2011-11-16 16:46:09 +00:00

vm_reserv.c

Introduce vm_reserv_alloc_contig() and teach vm_page_alloc_contig() how to

2011-12-05 18:29:25 +00:00

vm_reserv.h

Introduce vm_reserv_alloc_contig() and teach vm_page_alloc_contig() how to

2011-12-05 18:29:25 +00:00

vm_unix.c

Control the execution permission of the readable segments for

2011-10-15 12:35:18 +00:00

vm_zeroidle.c

Split P_NOLOAD into a per-thread flag (TDF_NOLOAD).

2009-11-03 16:46:52 +00:00

vm.h

Replace pointer to "struct uidinfo" with pointer to "struct ucred"

2010-12-02 17:37:16 +00:00

vnode_pager.c

Account the writeable shared mappings backed by file in the vnode

2012-02-23 21:07:16 +00:00

vnode_pager.h

Account the writeable shared mappings backed by file in the vnode

2012-02-23 21:07:16 +00:00