| Commit message (Collapse) | Author | Age | Files | Lines |
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migration by not migrating temporary stacks
Page migration requires rmap to be able to find all ptes mapping a page
at all times, otherwise the migration entry can be instantiated, but it
is possible to leave one behind if the second rmap_walk fails to find
the page. If this page is later faulted, migration_entry_to_page() will
call BUG because the page is locked indicating the page was migrated by
the migration PTE not cleaned up. For example
kernel BUG at include/linux/swapops.h:105!
invalid opcode: 0000 [#1] PREEMPT SMP
...
Call Trace:
[<ffffffff810e951a>] handle_mm_fault+0x3f8/0x76a
[<ffffffff8130c7a2>] do_page_fault+0x44a/0x46e
[<ffffffff813099b5>] page_fault+0x25/0x30
[<ffffffff8114de33>] load_elf_binary+0x152a/0x192b
[<ffffffff8111329b>] search_binary_handler+0x173/0x313
[<ffffffff81114896>] do_execve+0x219/0x30a
[<ffffffff8100a5c6>] sys_execve+0x43/0x5e
[<ffffffff8100320a>] stub_execve+0x6a/0xc0
RIP [<ffffffff811094ff>] migration_entry_wait+0xc1/0x129
There is a race between shift_arg_pages and migration that triggers this
bug. A temporary stack is setup during exec and later moved. If
migration moves a page in the temporary stack and the VMA is then removed
before migration completes, the migration PTE may not be found leading to
a BUG when the stack is faulted.
This patch causes pages within the temporary stack during exec to be
skipped by migration. It does this by marking the VMA covering the
temporary stack with an otherwise impossible combination of VMA flags.
These flags are cleared when the temporary stack is moved to its final
location.
[kamezawa.hiroyu@jp.fujitsu.com: idea for having migration skip temporary stacks]
Signed-off-by: Mel Gorman <mel@csn.ul.ie>
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Reviewed-by: Rik van Riel <riel@redhat.com>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Minchan Kim <minchan.kim@gmail.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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If !CONFIG_HUGETLB_PAGE, pagemap_hugetlb_range() is never called. So put
it (and its calling function) into #ifdef block.
Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Acked-by: Matt Mackall <mpm@selenic.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/frederic/random-tracing
* 'bkl/ioctl' of git://git.kernel.org/pub/scm/linux/kernel/git/frederic/random-tracing:
uml: Pushdown the bkl from harddog_kern ioctl
sunrpc: Pushdown the bkl from sunrpc cache ioctl
sunrpc: Pushdown the bkl from ioctl
autofs4: Pushdown the bkl from ioctl
uml: Convert to unlocked_ioctls to remove implicit BKL
ncpfs: BKL ioctl pushdown
coda: Clean-up whitespace problems in pioctl.c
coda: BKL ioctl pushdown
drivers: Push down BKL into various drivers
isdn: Push down BKL into ioctl functions
scsi: Push down BKL into ioctl functions
dvb: Push down BKL into ioctl functions
smbfs: Push down BKL into ioctl function
coda/psdev: Remove BKL from ioctl function
um/mmapper: Remove BKL usage
sn_hwperf: Kill BKL usage
hfsplus: Push down BKL into ioctl function
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Pushdown the bkl to autofs4_root_ioctl.
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ian Kent <raven@themaw.net>
Cc: Autofs <autofs@linux.kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: John Kacur <jkacur@redhat.com>
Cc: Arnd Bergmann <arnd@arndb.de>
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Convert ncp_ioctl to an unlocked_ioctl and push down the bkl into it.
Signed-off-by: John Kacur <jkacur@redhat.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Petr Vandrovec <vandrove@vc.cvut.cz>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
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Signed-off-by: John Kacur <jkacur@redhat.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Jan Harkes <jaharkes@cs.cmu.edu>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
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Convert coda_pioctl to an unlocked_ioctl pushing down the BKL
into it.
Signed-off-by: John Kacur <jkacur@redhat.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Jan Harkes <jaharkes@cs.cmu.edu>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
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Converting from ->ioctl to ->unlocked_ioctl with explicit
lock_kernel lets us kill the ioctl operation.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
[fixed inode reference in smb_ioctl]
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
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The ioctl function returns constant results, so it obviously
does not need the BKL and can be converted to unlocked_ioctl.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
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HFS is one of the remaining users of the ->ioctl function, convert it
blindly to unlocked_ioctl by pushing down the BKL.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
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* 'for-linus' of git://git.open-osd.org/linux-open-osd:
exofs: confusion between kmap() and kmap_atomic() api
exofs: Add default address_space_operations
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For kmap_atomic() we call kunmap_atomic() on the returned pointer.
That's different from kmap() and kunmap() and so it's easy to get them
backwards.
Cc: Stable <stable@kernel.org>
Signed-off-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
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All vectors of address_space_operations should be initialized
by the filesystem. Add the missing parts.
This is actually an optimization, by using
__set_page_dirty_nobuffers. The default, in case of NULL,
would be __set_page_dirty_buffers which has these extar if(s).
.releasepage && .invalidatepage should both not be called
because page_private() is NULL in exofs. Put a WARN_ON if
they are called, to indicate the Kernel has changed in this
regard, if when it does.
Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
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* git://git.kernel.org/pub/scm/linux/kernel/git/hirofumi/fatfs-2.6:
fat: convert to unlocked_ioctl
fat: Cleanup nls_unload() usage
fat: use pack_hex_byte() instead of custom one
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FAT does not require the BKL in its ioctl function, which is already serialized
through a mutex. Since we're already touching the ioctl code, also fix the
missing handling of FAT_IOCTL_GET_ATTRIBUTES in the compat code.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
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Other users doesn't check NULL explicitly. So, these doesn't also
check to remove inconsistency.
Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
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Signed-off-by: Andy Shevchenko <ext-andriy.shevchenko@nokia.com>
Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
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git://git.kernel.org/pub/scm/linux/kernel/git/ericvh/v9fs
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ericvh/v9fs:
9p: Optimize TCREATE by eliminating a redundant fid clone.
9p: cleanup: remove unneeded assignment
9p: Add mksock support
fs/9p: Make sure we properly instantiate dentry.
9p: add 9P2000.L rename operation
9p: add 9P2000.L statfs operation
9p: VFS switches for 9p2000.L: VFS switches
9p: VFS switches for 9p2000.L: protocol and client changes
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This patch removes a redundant fid clone on the directory fid and hence
reduces a server transaction while creating new filesystem object.
Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
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We never use "v9ses" and so we can remove it.
Signed-off-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
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Without this patch, an attempt to mksock will get an EINVAL.
Before this patch:
[root@localhost 1dir]# mksock mysock
mksock: error making mysock: Invalid argument
With this patch:
[root@localhost 1dir]# mksock mysock
[root@localhost 1dir]# ls -l mysock
s--------- 1 root root 0 2010-03-31 17:44 mysock
Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
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For lookup if we get ENOENT error from the server we still
instantiate the dentry. We need to make sure we have dentry
operations set in that case so that a later dput on the dentry
does the expected. Without the patch we get the below error
#ln -sf abc abclink
ln: creating symbolic link `abclink': No such file or directory
Now on the host do
$ touch abclink
Guest now gives ENOENT error.
# ls
ls: cannot access abclink: No such file or directory
Debugged-by:Gautham R Shenoy <ego@in.ibm.com>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
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I made a V2 of this patch on top of my patches for VFS switches.
All the changes were due to change in some offsets.
rename - change name of file or directory
size[4] Trename tag[2] fid[4] newdirfid[4] name[s]
size[4] Rrename tag[2]
The rename message is used to change the name of a file, possibly moving it
to a new directory. The 9P wstat message can only rename a file within the
same directory.
Signed-off-by: Jim Garlick <garlick@llnl.gov>
Signed-off-by: Sripathi Kodi <sripathik@in.ibm.com>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
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I made a V2 of this patch on top of my patches for VFS switches. The
change was adding v9fs_statfs pointer to v9fs_super_ops_dotl
instead of v9fs_super_ops.
statfs - get file system statistics
size[4] Tstatfs tag[2] fid[4]
size[4] Rstatfs tag[2] type[4] bsize[4] blocks[8] bfree[8] bavail[8]
files[8] ffree[8] fsid[8] namelen[4]
The statfs message is used to request file system information returned
by the statfs(2) system call, which is used by df(1) to report file
system and disk space usage.
Signed-off-by: Jim Garlick <garlick@llnl.gov>
Signed-off-by: Sripathi Kodi <sripathik@in.ibm.com>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
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Implements VFS switches for 9p2000.L protocol.
Signed-off-by: Sripathi Kodi <sripathik@in.ibm.com>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
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git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client: (59 commits)
ceph: reuse mon subscribe message instead of allocated anew
ceph: avoid resending queued message to monitor
ceph: Storage class should be before const qualifier
ceph: all allocation functions should get gfp_mask
ceph: specify max_bytes on readdir replies
ceph: cleanup pool op strings
ceph: Use kzalloc
ceph: use common helper for aborted dir request invalidation
ceph: cope with out of order (unsafe after safe) mds reply
ceph: save peer feature bits in connection structure
ceph: resync headers with userland
ceph: use ceph. prefix for virtual xattrs
ceph: throw out dirty caps metadata, data on session teardown
ceph: attempt mds reconnect if mds closes our session
ceph: clean up send_mds_reconnect interface
ceph: wait for mds OPEN reply to indicate reconnect success
ceph: only send cap releases when mds is OPEN|HUNG
ceph: dicard cap releases on mds restart
ceph: make mon client statfs handling more generic
ceph: drop src address(es) from message header [new protocol feature]
...
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Use the same message, allocated during startup. No need to reallocate a
new one each time around (and potentially ENOMEM).
Signed-off-by: Sage Weil <sage@newdream.net>
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The auth_reply handler will (re)send any pending requests. For the
initial mon authenticate phase, that's correct, but when a auth ticket
renewal races with an in-flight request, we may resend a request message
that is already in flight. Avoid this by revoking the message before
sending it.
We should also avoid resending requests at all during ticket renewal; that
will come soon.
Signed-off-by: Sage Weil <sage@newdream.net>
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The C99 specification states in section 6.11.5:
The placement of a storage-class specifier other than at the beginning
of the declaration specifiers in a declaration is an obsolescent
feature.
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
Signed-off-by: Sage Weil <sage@newdream.net>
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This is essential, as for the rados block device we'll need
to run in different contexts that would need flags that
are other than GFP_NOFS.
Signed-off-by: Yehuda Sadeh <yehuda@hq.newdream.net>
Signed-off-by: Sage Weil <sage@newdream.net>
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Specify max bytes in request to bound size of reply. Add associated
mount option with default value of 512 KB.
Signed-off-by: Sage Weil <sage@newdream.net>
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Signed-off-by: Sage Weil <sage@newdream.net>
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Use kzalloc rather than the combination of kmalloc and memset.
The semantic patch that makes this change is as follows:
(http://coccinelle.lip6.fr/)
// <smpl>
@@
expression x,size,flags;
statement S;
@@
-x = kmalloc(size,flags);
+x = kzalloc(size,flags);
if (x == NULL) S
-memset(x, 0, size);
// </smpl>
Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Sage Weil <sage@newdream.net>
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We invalidate I_COMPLETE and dentry leases in two places: on aborted mds
request and on request replay. Use common helper to avoid duplicate code.
Signed-off-by: Sage Weil <sage@newdream.net>
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Signed-off-by: Sage Weil <sage@newdream.net>
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These are used for adjusting behavior, such as conditionally encoding a
newer message format.
Signed-off-by: Sage Weil <sage@newdream.net>
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Notable changes include pool op defines and types, FLOCK feature bit, and
new CMPXATTR osd ops.
Signed-off-by: Sage Weil <sage@newdream.net>
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Drop the 'user.' prefix and use just 'ceph.' for fs virtual xattrs.
Signed-off-by: Sage Weil <sage@newdream.net>
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The remove_session_caps() helper is called when an MDS closes out our
session (either normally, or as a result of a failed reconnect), and when
we tear down state for umount. If we remove the last cap, and there are
no cap migrations in progress, then there is little hope of us flushing
out that data to the mds (without heroic efforts to reconnect and flush).
So, to avoid leaving inodes pinned (due to dirty state) and crashing after
umount, throw out dirty caps state and unpin the inodes. Print a warning
to the console so we know something was lost.
NOTE: Although we drop wrbuffer refs, we don't actually mark pages clean;
maybe a truncate should be queued?
Signed-off-by: Sage Weil <sage@newdream.net>
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Currently, if our session is closed (due to a timeout, or explicit close,
or whatever), we just sit there doing nothing unless/until the MDS
restarts, at which point we try to reconnect.
Change client to attempt an immediate reconnect if our session is closed.
Note that currently the MDS doesn't support this, and our attempt will
fail. We'll get a session CLOSE, our caps and dirty cap state will be
dropped, and the client will be free to attempt to reconnect. That's
clearly not as nice as a successful reconnect, but it at least allows us
to try to carry on, and in the future the MDS will support a reconnect
and we will fare better.
Signed-off-by: Sage Weil <sage@newdream.net>
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Pass a ceph_mds_session, since the caller has it.
Remove the dead code for sending empty reconnects. It used to be used
when the MDS contacted _us_ to solicit a reconnect, and we could reply
saying "go away, I have no session." Now we only send reconnects based
on the mds map, and only when we do in fact have an open session.
Signed-off-by: Sage Weil <sage@newdream.net>
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We used to infer reconnect success by watching the MDS state, essentially
assuming that hearing nothing meant things were ok. That wasn't
particularly reliable. Instead, the MDS replies with an explicit OPEN
message to indicate success.
Strictly speaking, this is a protocol change, but it is a backwards
compatible one that does not break new clients + old servers or old
clients + new servers. At least not yet.
Drop unused @all argument from kick_requests while we're at it.
Signed-off-by: Sage Weil <sage@newdream.net>
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On OPENING we shouldn't have any caps (or releases).
On CLOSING, we should wait until we succeed (and throw it all out), or
don't (and are OPEN again).
On RECONNECTING we can wait until we are OPEN.
Signed-off-by: Sage Weil <sage@newdream.net>
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If the MDS restarts, the expire caps state is no longer shared, and can be
thrown out. Caps state will be rebuilt on the MDS during the reconnect
process that follows. Zero out any release messages and adjust the
release counter accordingly.
Signed-off-by: Sage Weil <sage@newdream.net>
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This is being done so that we could reuse the statfs
infrastructure with other requests that return values.
Signed-off-by: Yehuda Sadeh <yehuda@hq.newdream.net>
Signed-off-by: Sage Weil <sage@newdream.net>
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The CEPH_FEATURE_NOSRCADDR protocol feature avoids putting the full source
address in each message header (twice). This patch switches the client to
the new scheme, and _requires_ this feature on the server. The server
will support both the old and new schemes. That means an old client will
work with a new server, but a new client will not work with an old server.
Signed-off-by: Sage Weil <sage@newdream.net>
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We don't ever use "dirty" so we can remove it.
Signed-off-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: Sage Weil <sage@newdream.net>
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Signed-off-by: Sage Weil <sage@newdream.net>
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The bdi_setup_and_register() helper doesn't help us since we bdi_init() in
create_client() and bdi_register() only when sget() succeeds.
Signed-off-by: Sage Weil <sage@newdream.net>
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Signed-off-by: Sage Weil <sage@newdream.net>
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