| Age | Commit message (Collapse) | Author | Files | Lines |
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* remove asm/atomic.h inclusion from linux/utsname.h --
not needed after kref conversion
* remove linux/utsname.h inclusion from files which do not need it
NOTE: it looks like fs/binfmt_elf.c do not need utsname.h, however
due to some personality stuff it _is_ needed -- cowardly leave ELF-related
headers and files alone.
Signed-off-by: Alexey Dobriyan <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
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* 'bugfixes' of git://git.linux-nfs.org/projects/trondmy/nfs-2.6:
NFS: Propagate 'fsc' mount option through automounts
sunrpc/rpc_pipe: fix kernel-doc notation
sunrpc: xdr_xcode_hyper helpers cannot presume 64-bit alignment
NFS: Add nfs_alloc_parsed_mount_data
NFS/RPC: fix problems with reestablish_timeout and related code.
NFS: Get rid of the NFS_MOUNT_VER3 and NFS_MOUNT_TCP flags
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Propagate the NFS 'fsc' mount option through NFS automounts of various types.
This is now required as commit:
commit c02d7adf8c5429727a98bad1d039bccad4c61c50
Author: Trond Myklebust <[email protected]>
Date: Mon Jun 22 15:09:14 2009 -0400
NFSv4: Replace nfs4_path_walk() with VFS path lookup in a private namespace
uses VFS-driven automounting to reach all submounts barring the root, thus
preventing fscaching from being enabled on any submount other than the root.
This patch gets around that by propagating the NFS_OPTION_FSCACHE flag across
automounts. If a uniquifier is supplied to a mount then this is propagated to
all automounts of that mount too.
Signed-off-by: David Howells <[email protected]>
[Trond: Fixed up the definition of nfs_fscache_get_super_cookie for the
case of #undef CONFIG_NFS_FSCACHE]
Signed-off-by: Trond Myklebust <[email protected]>
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Allocating nfs_parsed_mount_data and setting up the defaults is nearly
the same for both nfs and nfs4 mounts.
Both paths seem to use nfs_validate_transport_protocol(), so setting a
default value for nfs_server.protocol ought to be unnecessary.
Signed-off-by: Chuck Lever <[email protected]>
Signed-off-by: Trond Myklebust <[email protected]>
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Keep it in the case of the legacy binary mount interface, but purge it from
the nfs_server structure.
Signed-off-by: Trond Myklebust <[email protected]>
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This patch adds a persistent, read-only caching facility for
9p clients using the FS-Cache caching backend.
When the fscache facility is enabled, each inode is associated
with a corresponding vcookie which is an index into the FS-Cache
indexing tree. The FS-Cache indexing tree is indexed at 3 levels:
- session object associated with each mount.
- inode/vcookie
- actual data (pages)
A cache tag is chosen randomly for each session. These tags can
be read off /sys/fs/9p/caches and can be passed as a mount-time
parameter to re-attach to the specified caching session.
Signed-off-by: Abhishek Kulkarni <[email protected]>
Signed-off-by: Eric Van Hensbergen <[email protected]>
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When using the cache=loose flags, the inode's size was not being
updated correctly on a remote write. Thus subsequent reads of
the whole file resulted in a truncated read. Fix it.
Signed-off-by: Abhishek Kulkarni <[email protected]>
Signed-off-by: Eric Van Hensbergen <[email protected]>
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directly.
Change all occurrence of inode->i_size with i_size_read() or i_size_write()
as appropriate.
Signed-off-by: Abhishek Kulkarni <[email protected]>
Signed-off-by: Eric Van Hensbergen <[email protected]>
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* git://git.infradead.org/mtd-2.6: (58 commits)
mtd: jedec_probe: add PSD4256G6V id
mtd: OneNand support for Nomadik 8815 SoC (on NHK8815 board)
mtd: nand: driver for Nomadik 8815 SoC (on NHK8815 board)
m25p80: Add Spansion S25FL129P serial flashes
jffs2: Use SLAB_HWCACHE_ALIGN for jffs2_raw_{dirent,inode} slabs
mtd: sh_flctl: register sh_flctl using platform_driver_probe()
mtd: nand: txx9ndfmc: transfer 512 byte at a time if possible
mtd: nand: fix tmio_nand ecc correction
mtd: nand: add __nand_correct_data helper function
mtd: cfi_cmdset_0002: add 0xFF intolerance for M29W128G
mtd: inftl: fix fold chain block number
mtd: jedec: fix compilation problem with I28F640C3B definition
mtd: nand: fix ECC Correction bug for SMC ordering for NDFC driver
mtd: ofpart: Check availability of reg property instead of name property
driver/Makefile: Initialize "mtd" and "spi" before "net"
mtd: omap: adding DMA mode support in nand prefetch/post-write
mtd: omap: add support for nand prefetch-read and post-write
mtd: add nand support for w90p910 (v2)
mtd: maps: add mtd-ram support to physmap_of
mtd: pxa3xx_nand: add single-bit error corrections reporting
...
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git://git.kernel.org/pub/scm/linux/kernel/git/jlbec/ocfs2
* 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jlbec/ocfs2: (85 commits)
ocfs2: Use buffer IO if we are appending a file.
ocfs2: add spinlock protection when dealing with lockres->purge.
dlmglue.c: add missed mlog lines
ocfs2: __ocfs2_abort() should not enable panic for local mounts
ocfs2: Add ioctl for reflink.
ocfs2: Enable refcount tree support.
ocfs2: Implement ocfs2_reflink.
ocfs2: Add preserve to reflink.
ocfs2: Create reflinked file in orphan dir.
ocfs2: Use proper parameter for some inode operation.
ocfs2: Make transaction extend more efficient.
ocfs2: Don't merge in 1st refcount ops of reflink.
ocfs2: Modify removing xattr process for refcount.
ocfs2: Add reflink support for xattr.
ocfs2: Create an xattr indexed block if needed.
ocfs2: Call refcount tree remove process properly.
ocfs2: Attach xattr clusters to refcount tree.
ocfs2: Abstract ocfs2 xattr tree extend rec iteration process.
ocfs2: Abstract the creation of xattr block.
ocfs2: Remove inode from ocfs2_xattr_bucket_get_name_value.
...
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For this system call user space passes a signed long length parameter,
while the kernel side takes an unsigned long parameter and converts it
later to signed long again.
This has led to bugs in compat wrappers see e.g. dd90bbd5 "powerpc: Add
compat_sys_truncate". The s390 compat wrapper for this functions is
broken as well since it also performs zero extension instead of sign
extension for the length parameter.
In addition if hpa comes up with an automated way of generating
compat wrappers it would generate a wrong one here.
So change the length parameter from unsigned long to long.
Cc: "H. Peter Anvin" <[email protected]>
Cc: Al Viro <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Signed-off-by: Heiko Carstens <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
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Unlike on most other architectures ino_t is an unsigned int on s390. So
add an explicit cast to avoid this compile warning:
fs/ext2/namei.c: In function 'ext2_lookup':
fs/ext2/namei.c:73: warning: format '%lu' expects type 'long unsigned int', but argument 4 has type 'ino_t'
Signed-off-by: Heiko Carstens <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
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There are a few places in the Minix FS code where the "inode" field of a
minix_dir_entry is used without checking first to see if the dirent is
really a minix3_dir_entry. The inode number in a V1/V2 dirent is 16 bits,
whereas that in a V3 dirent is 32 bits.
Accessing it as a 16 bit field when it really should be accessed as a 32
bit field probably kinda sorta works on a little-endian machine, but leads
to some rather odd behaviour on big-endian machines.
[[email protected]: coding-style fixes]
Signed-off-by: Doug Graham <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
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We want to check for s_inode's existence, not inode's one (inode is always
valid in this function).
This takes care of the following entry from Dan's list:
fs/ncpfs/ioctl.c +445 __ncp_ioctl(180) warning: variable derefenced before check 'inode'
Reported-by: Dan Carpenter <[email protected]>
Cc: Julia Lawall <[email protected]>
Signed-off-by: Bartlomiej Zolnierkiewicz <[email protected]>
Cc: Petr Vandrovec <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
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This function uses signed integers for the unix_date and local variables -
if a negative number is supplied and the leap-year condition is not met,
month will be 0, leading to a later read of day_n[-1]
Signed-off-by: Roel Kluin <[email protected]>
Cc: Petr Vandrovec <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
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initramfs userspace likes to use this magic number.
Cc: Hugh Dickins <[email protected]>
Signed-off-by: maximilian attems <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
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After memory hotplug (or other events in future), kcore size can be
modified.
To update inode->i_size, we have to know inode/dentry but we can't get it
from inside /proc directly. But considerinyg memory hotplug, kcore image
is updated only when it's opened. Then, updating inode->i_size at open()
is enough.
Signed-off-by: KAMEZAWA Hiroyuki <[email protected]>
Acked-by: WANG Cong <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
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Presently the size of /proc/kcore which can be read by 'ls -l' is 0. But
it's not the correct value.
On x86-64, ls -l shows
... root root 140737486266368 2009-09-17 10:29 /proc/kcore
Then, 7FFFFFFE02000. This comes from vmalloc area's size.
(*) This shows "core" size, not memory size.
This patch shows the size by updating "size" field in struct
proc_dir_entry. Later, lookup routine will create inode and fill
inode->i_size based on this value. Then, this has a problem.
- Once inode is cached, inode->i_size will never be updated.
Then, this patch is not memory-hotplug-aware.
To update inode->i_size, we have to know dentry or inode.
But there is no way to lookup them by inside kernel. Hmmm....
Next patch will try it.
Signed-off-by: KAMEZAWA Hiroyuki <[email protected]>
Acked-by: WANG Cong <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
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proc_kcore_init() doesn't check NULL case. fix it and remove unnecessary
comments.
Signed-off-by: KAMEZAWA Hiroyuki <[email protected]>
Acked-by: WANG Cong <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
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Some archs define MODULED_VADDR/MODULES_END which is not in VMALLOC area.
This is handled only in x86-64. This patch make it more generic. And we
can use vread/vwrite to access the area. Fix it.
Signed-off-by: KAMEZAWA Hiroyuki <[email protected]>
Cc: Jiri Slaby <[email protected]>
Cc: Ralf Baechle <[email protected]>
Cc: Benjamin Herrenschmidt <[email protected]>
Cc: WANG Cong <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
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Benjamin Herrenschmidt <[email protected]> pointed out that vmemmap
range is not included in KCORE_RAM, KCORE_VMALLOC ....
This adds KCORE_VMEMMAP if SPARSEMEM_VMEMMAP is used. By this, vmemmap
can be readable via /proc/kcore
Because it's not vmalloc area, vread/vwrite cannot be used. But the range
is static against the memory layout, this patch handles vmemmap area by
the same scheme with physical memory.
This patch assumes SPARSEMEM_VMEMMAP range is not in VMALLOC range. It's
correct now.
[[email protected]: fix typo]
Signed-off-by: KAMEZAWA Hiroyuki <[email protected]>
Cc: Jiri Slaby <[email protected]>
Cc: Ralf Baechle <[email protected]>
Cc: Benjamin Herrenschmidt <[email protected]>
Cc: WANG Cong <[email protected]>
Cc: Benjamin Herrenschmidt <[email protected]>
Cc: Randy Dunlap <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
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For /proc/kcore, each arch registers its memory range by kclist_add().
In usual,
- range of physical memory
- range of vmalloc area
- text, etc...
are registered but "range of physical memory" has some troubles. It
doesn't updated at memory hotplug and it tend to include unnecessary
memory holes. Now, /proc/iomem (kernel/resource.c) includes required
physical memory range information and it's properly updated at memory
hotplug. Then, it's good to avoid using its own code(duplicating
information) and to rebuild kclist for physical memory based on
/proc/iomem.
Signed-off-by: KAMEZAWA Hiroyuki <[email protected]>
Signed-off-by: Jiri Slaby <[email protected]>
Cc: Ralf Baechle <[email protected]>
Cc: Benjamin Herrenschmidt <[email protected]>
Cc: WANG Cong <[email protected]>
Cc: KOSAKI Motohiro <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
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Some 64bit arch has special segment for mapping kernel text. It should be
entried to /proc/kcore in addtion to direct-linear-map, vmalloc area.
This patch unifies KCORE_TEXT entry scattered under x86 and ia64.
I'm not familiar with other archs (mips has its own even after this patch)
but range of [_stext ..._end) is a valid area of text and it's not in
direct-map area, defining CONFIG_ARCH_PROC_KCORE_TEXT is only a necessary
thing to do.
Note: I left mips as it is now.
Signed-off-by: KAMEZAWA Hiroyuki <[email protected]>
Cc: Ralf Baechle <[email protected]>
Cc: Benjamin Herrenschmidt <[email protected]>
Cc: WANG Cong <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
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For /proc/kcore, vmalloc areas are registered per arch. But, all of them
registers same range of [VMALLOC_START...VMALLOC_END) This patch unifies
them. By this. archs which have no kclist_add() hooks can see vmalloc
area correctly.
Signed-off-by: KAMEZAWA Hiroyuki <[email protected]>
Cc: Ralf Baechle <[email protected]>
Cc: Benjamin Herrenschmidt <[email protected]>
Cc: WANG Cong <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
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Presently, kclist_add() only eats start address and size as its arguments.
Considering to make kclist dynamically reconfigulable, it's necessary to
know which kclists are for System RAM and which are not.
This patch add kclist types as
KCORE_RAM
KCORE_VMALLOC
KCORE_TEXT
KCORE_OTHER
This "type" is used in a patch following this for detecting KCORE_RAM.
Signed-off-by: KAMEZAWA Hiroyuki <[email protected]>
Cc: Ralf Baechle <[email protected]>
Cc: Benjamin Herrenschmidt <[email protected]>
Cc: WANG Cong <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
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This patchset is for /proc/kcore. With this,
- many per-arch hooks are removed.
- /proc/kcore will know really valid physical memory area.
- /proc/kcore will be aware of memory hotplug.
- /proc/kcore will be architecture independent i.e.
if an arch supports CONFIG_MMU, it can use /proc/kcore.
(if the arch uses usual memory layout.)
This patch:
/proc/kcore uses its own list handling codes. It's better to use
generic list codes.
No changes in logic. just clean up.
Signed-off-by: KAMEZAWA Hiroyuki <[email protected]>
Cc: Ralf Baechle <[email protected]>
Cc: Benjamin Herrenschmidt <[email protected]>
Cc: WANG Cong <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
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A patch to give a better overview of the userland application stack usage,
especially for embedded linux.
Currently you are only able to dump the main process/thread stack usage
which is showed in /proc/pid/status by the "VmStk" Value. But you get no
information about the consumed stack memory of the the threads.
There is an enhancement in the /proc/<pid>/{task/*,}/*maps and which marks
the vm mapping where the thread stack pointer reside with "[thread stack
xxxxxxxx]". xxxxxxxx is the maximum size of stack. This is a value
information, because libpthread doesn't set the start of the stack to the
top of the mapped area, depending of the pthread usage.
A sample output of /proc/<pid>/task/<tid>/maps looks like:
08048000-08049000 r-xp 00000000 03:00 8312 /opt/z
08049000-0804a000 rw-p 00001000 03:00 8312 /opt/z
0804a000-0806b000 rw-p 00000000 00:00 0 [heap]
a7d12000-a7d13000 ---p 00000000 00:00 0
a7d13000-a7f13000 rw-p 00000000 00:00 0 [thread stack: 001ff4b4]
a7f13000-a7f14000 ---p 00000000 00:00 0
a7f14000-a7f36000 rw-p 00000000 00:00 0
a7f36000-a8069000 r-xp 00000000 03:00 4222 /lib/libc.so.6
a8069000-a806b000 r--p 00133000 03:00 4222 /lib/libc.so.6
a806b000-a806c000 rw-p 00135000 03:00 4222 /lib/libc.so.6
a806c000-a806f000 rw-p 00000000 00:00 0
a806f000-a8083000 r-xp 00000000 03:00 14462 /lib/libpthread.so.0
a8083000-a8084000 r--p 00013000 03:00 14462 /lib/libpthread.so.0
a8084000-a8085000 rw-p 00014000 03:00 14462 /lib/libpthread.so.0
a8085000-a8088000 rw-p 00000000 00:00 0
a8088000-a80a4000 r-xp 00000000 03:00 8317 /lib/ld-linux.so.2
a80a4000-a80a5000 r--p 0001b000 03:00 8317 /lib/ld-linux.so.2
a80a5000-a80a6000 rw-p 0001c000 03:00 8317 /lib/ld-linux.so.2
afaf5000-afb0a000 rw-p 00000000 00:00 0 [stack]
ffffe000-fffff000 r-xp 00000000 00:00 0 [vdso]
Also there is a new entry "stack usage" in /proc/<pid>/{task/*,}/status
which will you give the current stack usage in kb.
A sample output of /proc/self/status looks like:
Name: cat
State: R (running)
Tgid: 507
Pid: 507
.
.
.
CapBnd: fffffffffffffeff
voluntary_ctxt_switches: 0
nonvoluntary_ctxt_switches: 0
Stack usage: 12 kB
I also fixed stack base address in /proc/<pid>/{task/*,}/stat to the base
address of the associated thread stack and not the one of the main
process. This makes more sense.
[[email protected]: fs/proc/array.c now needs walk_page_range()]
Signed-off-by: Stefani Seibold <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Alexey Dobriyan <[email protected]>
Cc: "Eric W. Biederman" <[email protected]>
Cc: Randy Dunlap <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
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Remove obfuscated zero-length input check and return -EINVAL instead of
-EIO error to make the error message clear to user. Add whitespace
stripping. No functionality changes.
The old code:
echo 1 > /proc/pid/make-it-fail (ok)
echo 1foo > /proc/pid/make-it-fail (-bash: echo: write error: Input/output error)
The new code:
echo 1 > /proc/pid/make-it-fail (ok)
echo 1foo > /proc/pid/make-it-fail (-bash: echo: write error: Invalid argument)
This patch is conservative in changes to not breaking existing
scripts/applications.
Signed-off-by: Vincent Li <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
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Andrew Morton pointed out similar string hacking and obfuscated check for
zero-length input at the end of the function, David Rientjes suggested to
use strict_strtol to replace simple_strtol, this patch cover above
suggestions, add removing of leading and trailing whitespace from user
input. It does not change function behavious.
Signed-off-by: Vincent Li <[email protected]>
Acked-by: David Rientjes <[email protected]>
Cc: Matt Mackall <[email protected]>
Cc: Amerigo Wang <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
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In 9063c61fd5cbd ("x86, 64-bit: Clean up user address masking") Linus
fixed the wrong size of /proc/kcore problem.
But its size still looks insane, since it never equals the size of
physical memory.
Signed-off-by: WANG Cong <[email protected]>
Cc: "Eric W. Biederman" <[email protected]>
Cc: Tao Ma <[email protected]>
Cc: <[email protected]>
Acked-by: KAMEZAWA Hiroyuki <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
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The exiting sub-thread flushes /proc/pid only, but this doesn't buy too
much: ps and friends mostly use /proc/tid/task/pid.
Remove "if (thread_group_leader())" checks from proc_flush_task() path,
this means we always remove /proc/tid/task/pid dentry on exit, and this
actually matches the comment above proc_flush_task().
The test-case:
static void* tfunc(void *arg)
{
char name[256];
sprintf(name, "/proc/%d/task/%ld/status", getpid(), gettid());
close(open(name, O_RDONLY));
return NULL;
}
int main(void)
{
pthread_t t;
for (;;) {
if (!pthread_create(&t, NULL, &tfunc, NULL))
pthread_join(t, NULL);
}
}
slabtop shows that pid/proc_inode_cache/etc grow quickly and
"indefinitely" until the task is killed or shrink_slab() is called, not
good. And the main thread needs a lot of time to exit.
The same can happen if something like "ps -efL" runs continuously, while
some application spawns short-living threads.
Reported-by: "James M. Leddy" <[email protected]>
Signed-off-by: Oleg Nesterov <[email protected]>
Cc: Alexey Dobriyan <[email protected]>
Cc: "Eric W. Biederman" <[email protected]>
Cc: Dominic Duval <[email protected]>
Cc: Frank Hirtz <[email protected]>
Cc: "Fuller, Johnray" <[email protected]>
Cc: Larry Woodman <[email protected]>
Cc: Paul Batkowski <[email protected]>
Cc: Roland McGrath <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
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/proc/$pid/limits should show RLIMIT_CPU as seconds, which is the unit
used in kernel/posix-cpu-timers.c:
unsigned long psecs = cputime_to_secs(ptime);
...
if (psecs >= sig->rlim[RLIMIT_CPU].rlim_max) {
...
__group_send_sig_info(SIGKILL, SEND_SIG_PRIV, tsk);
Signed-off-by: Kees Cook <[email protected]>
Acked-by: WANG Cong <[email protected]>
Acked-by: Neil Horman <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
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Make ->ru_maxrss value in struct rusage filled accordingly to rss hiwater
mark. This struct is filled as a parameter to getrusage syscall.
->ru_maxrss value is set to KBs which is the way it is done in BSD
systems. /usr/bin/time (gnu time) application converts ->ru_maxrss to KBs
which seems to be incorrect behavior. Maintainer of this util was
notified by me with the patch which corrects it and cc'ed.
To make this happen we extend struct signal_struct by two fields. The
first one is ->maxrss which we use to store rss hiwater of the task. The
second one is ->cmaxrss which we use to store highest rss hiwater of all
task childs. These values are used in k_getrusage() to actually fill
->ru_maxrss. k_getrusage() uses current rss hiwater value directly if mm
struct exists.
Note:
exec() clear mm->hiwater_rss, but doesn't clear sig->maxrss.
it is intetionally behavior. *BSD getrusage have exec() inheriting.
test programs
========================================================
getrusage.c
===========
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <signal.h>
#include <sys/mman.h>
#include "common.h"
#define err(str) perror(str), exit(1)
int main(int argc, char** argv)
{
int status;
printf("allocate 100MB\n");
consume(100);
printf("testcase1: fork inherit? \n");
printf(" expect: initial.self ~= child.self\n");
show_rusage("initial");
if (__fork()) {
wait(&status);
} else {
show_rusage("fork child");
_exit(0);
}
printf("\n");
printf("testcase2: fork inherit? (cont.) \n");
printf(" expect: initial.children ~= 100MB, but child.children = 0\n");
show_rusage("initial");
if (__fork()) {
wait(&status);
} else {
show_rusage("child");
_exit(0);
}
printf("\n");
printf("testcase3: fork + malloc \n");
printf(" expect: child.self ~= initial.self + 50MB\n");
show_rusage("initial");
if (__fork()) {
wait(&status);
} else {
printf("allocate +50MB\n");
consume(50);
show_rusage("fork child");
_exit(0);
}
printf("\n");
printf("testcase4: grandchild maxrss\n");
printf(" expect: post_wait.children ~= 300MB\n");
show_rusage("initial");
if (__fork()) {
wait(&status);
show_rusage("post_wait");
} else {
system("./child -n 0 -g 300");
_exit(0);
}
printf("\n");
printf("testcase5: zombie\n");
printf(" expect: pre_wait ~= initial, IOW the zombie process is not accounted.\n");
printf(" post_wait ~= 400MB, IOW wait() collect child's max_rss. \n");
show_rusage("initial");
if (__fork()) {
sleep(1); /* children become zombie */
show_rusage("pre_wait");
wait(&status);
show_rusage("post_wait");
} else {
system("./child -n 400");
_exit(0);
}
printf("\n");
printf("testcase6: SIG_IGN\n");
printf(" expect: initial ~= after_zombie (child's 500MB alloc should be ignored).\n");
show_rusage("initial");
signal(SIGCHLD, SIG_IGN);
if (__fork()) {
sleep(1); /* children become zombie */
show_rusage("after_zombie");
} else {
system("./child -n 500");
_exit(0);
}
printf("\n");
signal(SIGCHLD, SIG_DFL);
printf("testcase7: exec (without fork) \n");
printf(" expect: initial ~= exec \n");
show_rusage("initial");
execl("./child", "child", "-v", NULL);
return 0;
}
child.c
=======
#include <sys/types.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/resource.h>
#include "common.h"
int main(int argc, char** argv)
{
int status;
int c;
long consume_size = 0;
long grandchild_consume_size = 0;
int show = 0;
while ((c = getopt(argc, argv, "n:g:v")) != -1) {
switch (c) {
case 'n':
consume_size = atol(optarg);
break;
case 'v':
show = 1;
break;
case 'g':
grandchild_consume_size = atol(optarg);
break;
default:
break;
}
}
if (show)
show_rusage("exec");
if (consume_size) {
printf("child alloc %ldMB\n", consume_size);
consume(consume_size);
}
if (grandchild_consume_size) {
if (fork()) {
wait(&status);
} else {
printf("grandchild alloc %ldMB\n", grandchild_consume_size);
consume(grandchild_consume_size);
exit(0);
}
}
return 0;
}
common.c
========
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <signal.h>
#include <sys/mman.h>
#include "common.h"
#define err(str) perror(str), exit(1)
void show_rusage(char *prefix)
{
int err, err2;
struct rusage rusage_self;
struct rusage rusage_children;
printf("%s: ", prefix);
err = getrusage(RUSAGE_SELF, &rusage_self);
if (!err)
printf("self %ld ", rusage_self.ru_maxrss);
err2 = getrusage(RUSAGE_CHILDREN, &rusage_children);
if (!err2)
printf("children %ld ", rusage_children.ru_maxrss);
printf("\n");
}
/* Some buggy OS need this worthless CPU waste. */
void make_pagefault(void)
{
void *addr;
int size = getpagesize();
int i;
for (i=0; i<1000; i++) {
addr = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON, -1, 0);
if (addr == MAP_FAILED)
err("make_pagefault");
memset(addr, 0, size);
munmap(addr, size);
}
}
void consume(int mega)
{
size_t sz = mega * 1024 * 1024;
void *ptr;
ptr = malloc(sz);
memset(ptr, 0, sz);
make_pagefault();
}
pid_t __fork(void)
{
pid_t pid;
pid = fork();
make_pagefault();
return pid;
}
common.h
========
void show_rusage(char *prefix);
void make_pagefault(void);
void consume(int mega);
pid_t __fork(void);
FreeBSD result (expected result)
========================================================
allocate 100MB
testcase1: fork inherit?
expect: initial.self ~= child.self
initial: self 103492 children 0
fork child: self 103540 children 0
testcase2: fork inherit? (cont.)
expect: initial.children ~= 100MB, but child.children = 0
initial: self 103540 children 103540
child: self 103564 children 0
testcase3: fork + malloc
expect: child.self ~= initial.self + 50MB
initial: self 103564 children 103564
allocate +50MB
fork child: self 154860 children 0
testcase4: grandchild maxrss
expect: post_wait.children ~= 300MB
initial: self 103564 children 154860
grandchild alloc 300MB
post_wait: self 103564 children 308720
testcase5: zombie
expect: pre_wait ~= initial, IOW the zombie process is not accounted.
post_wait ~= 400MB, IOW wait() collect child's max_rss.
initial: self 103564 children 308720
child alloc 400MB
pre_wait: self 103564 children 308720
post_wait: self 103564 children 411312
testcase6: SIG_IGN
expect: initial ~= after_zombie (child's 500MB alloc should be ignored).
initial: self 103564 children 411312
child alloc 500MB
after_zombie: self 103624 children 411312
testcase7: exec (without fork)
expect: initial ~= exec
initial: self 103624 children 411312
exec: self 103624 children 411312
Linux result (actual test result)
========================================================
allocate 100MB
testcase1: fork inherit?
expect: initial.self ~= child.self
initial: self 102848 children 0
fork child: self 102572 children 0
testcase2: fork inherit? (cont.)
expect: initial.children ~= 100MB, but child.children = 0
initial: self 102876 children 102644
child: self 102572 children 0
testcase3: fork + malloc
expect: child.self ~= initial.self + 50MB
initial: self 102876 children 102644
allocate +50MB
fork child: self 153804 children 0
testcase4: grandchild maxrss
expect: post_wait.children ~= 300MB
initial: self 102876 children 153864
grandchild alloc 300MB
post_wait: self 102876 children 307536
testcase5: zombie
expect: pre_wait ~= initial, IOW the zombie process is not accounted.
post_wait ~= 400MB, IOW wait() collect child's max_rss.
initial: self 102876 children 307536
child alloc 400MB
pre_wait: self 102876 children 307536
post_wait: self 102876 children 410076
testcase6: SIG_IGN
expect: initial ~= after_zombie (child's 500MB alloc should be ignored).
initial: self 102876 children 410076
child alloc 500MB
after_zombie: self 102880 children 410076
testcase7: exec (without fork)
expect: initial ~= exec
initial: self 102880 children 410076
exec: self 102880 children 410076
Signed-off-by: Jiri Pirko <[email protected]>
Signed-off-by: KOSAKI Motohiro <[email protected]>
Cc: Oleg Nesterov <[email protected]>
Cc: Hugh Dickins <[email protected]>
Cc: Ingo Molnar <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
|
|
Compat utimensat() returns EINVAL when the tv_nsec is one of UTIME_OMIT or
UTIME_NOW and the tv_sec is set to non-zero. As per man pages, the tv_sec
field should be ignored.
sys_utimensat() works fine in this case.
Test case:
#define _GNU_SOURCE
#define _ATFILE_SOURCE
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/stat.h>
#include <stdlib.h>
main(int argc, char *argv[])
{
struct timespec ts[2];
struct timespec *tsp;
if (argc < 2) {
fprintf(stderr, "Usage : %s filename\n", argv[0]);
exit (-1);
}
ts[0].tv_nsec = ts[1].tv_nsec = UTIME_NOW;
ts[0].tv_sec = ts[1].tv_sec = 1;
tsp = ts;
if (utimensat(AT_FDCWD, argv[1],tsp,0) == -1)
perror("utimensat");
else
fprintf(stdout, "utimensat success\n");
return 0;
}
mjs22lp5:~ # cc -m64 utimensat-test.c -o utimensat_test64
mjs22lp5:~ # cc -m32 utimensat-test.c -o utimensat_test32
mjs22lp5:~ # ./utimensat_test32 /tmp/utimensat_test
utimensat: Invalid argument
mjs22lp5:~ # ./utimensat_test64 /tmp/utimensat_test
utimensat success
mjs22lp5:~ # uname -r
2.6.31-rc8
With the patch :
mjs22lp5:~ # ./utimensat_test64 /tmp/utimensat_test
utimensat success
mjs22lp5:~ # ./utimensat_test32 /tmp/utimensat_test
utimensat success
mjs22lp5:~ # uname -r
2.6.31-rc8utimensat
Signed-off-by: Suzuki K P <[email protected]>
Cc: Ulrich Drepper <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
|
|
qnx4 wrte support has never been fully implement, is broken since the dawn
of time and hasn't been actively developed since before git history
started.
Instead of letting it further bitrot and complicate API transition (like
the new truncate code) remove it.
Signed-off-by: Christoph Hellwig <[email protected]>
Cc: Anders Larsen <[email protected]>
Cc: Nick Piggin <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
|
|
do_sync_write() does the right thing for turning the aio_writev method
into a normal non-vectored synchronous write, no need to duplicate it in
ntfs.
Signed-off-by: Christoph Hellwig <[email protected]>
Acked-by: Anton Altaparmakov <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
|
|
Split the anonfd interface into a bare file pointer creation one, and a
file pointer creation plus install one.
There are cases, like the usage of eventfds inside other kernel
interfaces, where the file pointer created by anonfd needs to be used
inside the initialization of other structures.
As it is right now, as soon as anon_inode_getfd() returns, the kenrle can
race with userspace closing the newly installed file descriptor.
This patch, while keeping the old anon_inode_getfd(), introduces a new
anon_inode_getfile() (whose services are reused in anon_inode_getfd())
that allows to split the file creation phase and the fd install one.
Once all the kernel structures are initialized, the code can call the
proper fd_install().
Gregory manifested the need for something like this inside KVM.
Signed-off-by: Davide Libenzi <[email protected]>
Cc: Alexander Viro <[email protected]>
Cc: James Morris <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Gregory Haskins <[email protected]>
Acked-by: Serge Hallyn <[email protected]>
Acked-by: Roland Dreier <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
|
|
As mentioned in Documentation/CodingStyle, move EXPORT* macro's
to the line immediately after the closing function brace line.
Also, move the __initcall() similarly.
Signed-off-by: H Hartley Sweeten <[email protected]>
Cc: Zach Brown <[email protected]>
Cc: Benjamin LaHaise <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
|
|
According to Documentation/CodingStyle the EXPORT* macro should follow
immediately after the closing function brace line.
Also, mark_buffer_async_write_endio() and do_thaw_all() are not used
elsewhere so they should be marked as static.
In addition, file_fsync() is actually in fs/sync.c so move the EXPORT* to
that file.
Signed-off-by: H Hartley Sweeten <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
|
|
We have had a report of bad memory allocation latency during DVD-RAM (UDF)
writing. This is causing the user's desktop session to become unusable.
Jan tracked the cause of this down to UDF inode reclaim blocking:
gnome-screens D ffff810006d1d598 0 20686 1
ffff810006d1d508 0000000000000082 ffff810037db6718 0000000000000800
ffff810006d1d488 ffffffff807e4280 ffffffff807e4280 ffff810006d1a580
ffff8100bccbc140 ffff810006d1a8c0 0000000006d1d4e8 ffff810006d1a8c0
Call Trace:
[<ffffffff804477f3>] io_schedule+0x63/0xa5
[<ffffffff802c2587>] sync_buffer+0x3b/0x3f
[<ffffffff80447d2a>] __wait_on_bit+0x47/0x79
[<ffffffff80447dc6>] out_of_line_wait_on_bit+0x6a/0x77
[<ffffffff802c24f6>] __wait_on_buffer+0x1f/0x21
[<ffffffff802c442a>] __bread+0x70/0x86
[<ffffffff88de9ec7>] :udf:udf_tread+0x38/0x3a
[<ffffffff88de0fcf>] :udf:udf_update_inode+0x4d/0x68c
[<ffffffff88de26e1>] :udf:udf_write_inode+0x1d/0x2b
[<ffffffff802bcf85>] __writeback_single_inode+0x1c0/0x394
[<ffffffff802bd205>] write_inode_now+0x7d/0xc4
[<ffffffff88de2e76>] :udf:udf_clear_inode+0x3d/0x53
[<ffffffff802b39ae>] clear_inode+0xc2/0x11b
[<ffffffff802b3ab1>] dispose_list+0x5b/0x102
[<ffffffff802b3d35>] shrink_icache_memory+0x1dd/0x213
[<ffffffff8027ede3>] shrink_slab+0xe3/0x158
[<ffffffff8027fbab>] try_to_free_pages+0x177/0x232
[<ffffffff8027a578>] __alloc_pages+0x1fa/0x392
[<ffffffff802951fa>] alloc_page_vma+0x176/0x189
[<ffffffff802822d8>] __do_fault+0x10c/0x417
[<ffffffff80284232>] handle_mm_fault+0x466/0x940
[<ffffffff8044b922>] do_page_fault+0x676/0xabf
This blocks with iprune_mutex held, which then blocks other reclaimers:
X D ffff81009d47c400 0 17285 14831
ffff8100844f3728 0000000000000086 0000000000000000 ffff81000000e288
ffff81000000da00 ffffffff807e4280 ffffffff807e4280 ffff81009d47c400
ffffffff805ff890 ffff81009d47c740 00000000844f3808 ffff81009d47c740
Call Trace:
[<ffffffff80447f8c>] __mutex_lock_slowpath+0x72/0xa9
[<ffffffff80447e1a>] mutex_lock+0x1e/0x22
[<ffffffff802b3ba1>] shrink_icache_memory+0x49/0x213
[<ffffffff8027ede3>] shrink_slab+0xe3/0x158
[<ffffffff8027fbab>] try_to_free_pages+0x177/0x232
[<ffffffff8027a578>] __alloc_pages+0x1fa/0x392
[<ffffffff8029507f>] alloc_pages_current+0xd1/0xd6
[<ffffffff80279ac0>] __get_free_pages+0xe/0x4d
[<ffffffff802ae1b7>] __pollwait+0x5e/0xdf
[<ffffffff8860f2b4>] :nvidia:nv_kern_poll+0x2e/0x73
[<ffffffff802ad949>] do_select+0x308/0x506
[<ffffffff802adced>] core_sys_select+0x1a6/0x254
[<ffffffff802ae0b7>] sys_select+0xb5/0x157
Now I think the main problem is having the filesystem block (and do IO) in
inode reclaim. The problem is that this doesn't get accounted well and
penalizes a random allocator with a big latency spike caused by work
generated from elsewhere.
I think the best idea would be to avoid this. By design if possible, or
by deferring the hard work to an asynchronous context. If the latter,
then the fs would probably want to throttle creation of new work with
queue size of the deferred work, but let's not get into those details.
Anyway, the other obvious thing we looked at is the iprune_mutex which is
causing the cascading blocking. We could turn this into an rwsem to
improve concurrency. It is unreasonable to totally ban all potentially
slow or blocking operations in inode reclaim, so I think this is a cheap
way to get a small improvement.
This doesn't solve the whole problem of course. The process doing inode
reclaim will still take the latency hit, and concurrent processes may end
up contending on filesystem locks. So fs developers should keep these
problems in mind.
Signed-off-by: Nick Piggin <[email protected]>
Cc: Jan Kara <[email protected]>
Cc: Al Viro <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
|
|
Make all seq_operations structs const, to help mitigate against
revectoring user-triggerable function pointers.
This is derived from the grsecurity patch, although generated from scratch
because it's simpler than extracting the changes from there.
Signed-off-by: James Morris <[email protected]>
Acked-by: Serge Hallyn <[email protected]>
Acked-by: Casey Schaufler <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
|
|
Move various magic-number definitions into magic.h.
Signed-off-by: Nick Black <[email protected]>
Acked-by: Pekka Enberg <[email protected]>
Cc: Al Viro <[email protected]>
Cc: "David S. Miller" <[email protected]>
Cc: Casey Schaufler <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
|
|
__estimate_accuracy() was prone to integer overflow, for example if *tv ==
{2147, 483648000} on a 32 bit computer (or even for delays as small as
{429, 500000000} if the task is niced).
Because the result was already forced between 0 and 100ms, the effect of
the overflow was not too problematic, but the use of the hrtimer range
feature was not optimal in overflow cases.
This patch ensures that there can not be an integer overflow in this
function.
Signed-off-by: Guillaume Knispel <[email protected]>
Cc: Alexander Viro <[email protected]>
Cc: Arjan van de Ven <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Heiko Carstens <[email protected]>
Cc: Tejun Heo <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
|
|
This function uses signed integers for the unix_date and local variables -
if a negative number is supplied and the leap-year condition is not met,
month will be 0, leading to a read of day_n[-1]
Signed-off-by: Roel Kluin <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
|
|
In ocfs2_file_aio_write, we will prevent direct io if
we find that we are appending(changing i_size) and call
generic_file_aio_write_nolock. But actually O_DIRECT flag
is there and this function will call generic_file_direct_write
eventually which will update i_size and leave di->i_size
alone. The bug is
http://oss.oracle.com/bugzilla/show_bug.cgi?id=1173.
So this patch let ocfs2_direct_IO returns 0 directly if we
are appending so that buffered write will be called and
di->i_size get updated successfully. And this is also
what we want in ocfs2_file_aio_write.
Signed-off-by: Tao Ma <[email protected]>
Signed-off-by: Joel Becker <[email protected]>
|
|
when we check/modify lockres->purge, we should with the protection of lockres->spinlock.
in dlm_purge_lockres(), the checking/modifying is not with the protectin.
this patch fixes it.
Signed-off-by: Wengang Wang <[email protected]>
Signed-off-by: Joel Becker <[email protected]>
|
|
This patch adds the missed mlog_exit() and mlog_exit_void() lines when routines
return.
Signed-off-by: Coly Li <[email protected]>
Acked-by: Mark Fasheh <[email protected]>
Signed-off-by: Joel Becker <[email protected]>
|
|
In a clustered setup, we have to panic the box on journal abort. This is
because we don't have the facility to go hard readonly. With hard ro, another
node would detect node failure and initiate recovery.
Having said that, we shouldn't force panic if the volume is mounted locally.
This patch defers the handling to the mount option, errors.
Signed-off-by: Sunil Mushran <[email protected]>
Signed-off-by: Joel Becker <[email protected]>
|
|
The ioctl will take 3 parameters: old_path, new_path and
preserve and call vfs_reflink. It is useful when we backport
reflink features to old kernels.
Signed-off-by: Tao Ma <[email protected]>
|
|
Signed-off-by: Tao Ma <[email protected]>
|