This can only happen if there's a bug somewhere, so let's make it a WARN
not a printk. Also, I think it's safest to ignore the corruption rather
than trying to fix it by removing a cache entry.
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
nfsd4_process_cb_update() invokes svc_xprt_get(), which increases the
refcount of the "c->cn_xprt".
The reference counting issue happens in one exception handling path of
nfsd4_process_cb_update(). When setup callback client failed, the
function forgets to decrease the refcnt increased by svc_xprt_get(),
causing a refcnt leak.
Fix this issue by calling svc_xprt_put() when setup callback client
failed.
Signed-off-by: Xiyu Yang <xiyuyang19@fudan.edu.cn>
Signed-off-by: Xin Tan <tanxin.ctf@gmail.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Highlights of this series:
* Remove serialization of sending RPC/RDMA Replies
* Convert the TCP socket send path to use xdr_buf::bvecs (pre-requisite for
RPC-on-TLS)
* Fix svcrdma backchannel sendto return code
* Convert a number of dprintk call sites to use tracepoints
* Fix the "suggest braces around empty body in an 'else' statement" warning
fs/nfsd/nfsctl.c:256: warning: Function parameter or member 'file' not described in 'write_unlock_ip'
fs/nfsd/nfsctl.c:256: warning: Function parameter or member 'buf' not described in 'write_unlock_ip'
fs/nfsd/nfsctl.c:256: warning: Function parameter or member 'size' not described in 'write_unlock_ip'
fs/nfsd/nfsctl.c:295: warning: Function parameter or member 'file' not described in 'write_unlock_fs'
fs/nfsd/nfsctl.c:295: warning: Function parameter or member 'buf' not described in 'write_unlock_fs'
fs/nfsd/nfsctl.c:295: warning: Function parameter or member 'size' not described in 'write_unlock_fs'
fs/nfsd/nfsctl.c:352: warning: Function parameter or member 'file' not described in 'write_filehandle'
fs/nfsd/nfsctl.c:352: warning: Function parameter or member 'buf' not described in 'write_filehandle'
fs/nfsd/nfsctl.c:352: warning: Function parameter or member 'size' not described in 'write_filehandle'
fs/nfsd/nfsctl.c:434: warning: Function parameter or member 'file' not described in 'write_threads'
fs/nfsd/nfsctl.c:434: warning: Function parameter or member 'buf' not described in 'write_threads'
fs/nfsd/nfsctl.c:434: warning: Function parameter or member 'size' not described in 'write_threads'
fs/nfsd/nfsctl.c:478: warning: Function parameter or member 'file' not described in 'write_pool_threads'
fs/nfsd/nfsctl.c:478: warning: Function parameter or member 'buf' not described in 'write_pool_threads'
fs/nfsd/nfsctl.c:478: warning: Function parameter or member 'size' not described in 'write_pool_threads'
fs/nfsd/nfsctl.c:697: warning: Function parameter or member 'file' not described in 'write_versions'
fs/nfsd/nfsctl.c:697: warning: Function parameter or member 'buf' not described in 'write_versions'
fs/nfsd/nfsctl.c:697: warning: Function parameter or member 'size' not described in 'write_versions'
fs/nfsd/nfsctl.c:858: warning: Function parameter or member 'file' not described in 'write_ports'
fs/nfsd/nfsctl.c:858: warning: Function parameter or member 'buf' not described in 'write_ports'
fs/nfsd/nfsctl.c:858: warning: Function parameter or member 'size' not described in 'write_ports'
fs/nfsd/nfsctl.c:892: warning: Function parameter or member 'file' not described in 'write_maxblksize'
fs/nfsd/nfsctl.c:892: warning: Function parameter or member 'buf' not described in 'write_maxblksize'
fs/nfsd/nfsctl.c:892: warning: Function parameter or member 'size' not described in 'write_maxblksize'
fs/nfsd/nfsctl.c:941: warning: Function parameter or member 'file' not described in 'write_maxconn'
fs/nfsd/nfsctl.c:941: warning: Function parameter or member 'buf' not described in 'write_maxconn'
fs/nfsd/nfsctl.c:941: warning: Function parameter or member 'size' not described in 'write_maxconn'
fs/nfsd/nfsctl.c:1023: warning: Function parameter or member 'file' not described in 'write_leasetime'
fs/nfsd/nfsctl.c:1023: warning: Function parameter or member 'buf' not described in 'write_leasetime'
fs/nfsd/nfsctl.c:1023: warning: Function parameter or member 'size' not described in 'write_leasetime'
fs/nfsd/nfsctl.c:1039: warning: Function parameter or member 'file' not described in 'write_gracetime'
fs/nfsd/nfsctl.c:1039: warning: Function parameter or member 'buf' not described in 'write_gracetime'
fs/nfsd/nfsctl.c:1039: warning: Function parameter or member 'size' not described in 'write_gracetime'
fs/nfsd/nfsctl.c:1094: warning: Function parameter or member 'file' not described in 'write_recoverydir'
fs/nfsd/nfsctl.c:1094: warning: Function parameter or member 'buf' not described in 'write_recoverydir'
fs/nfsd/nfsctl.c:1094: warning: Function parameter or member 'size' not described in 'write_recoverydir'
fs/nfsd/nfsctl.c:1125: warning: Function parameter or member 'file' not described in 'write_v4_end_grace'
fs/nfsd/nfsctl.c:1125: warning: Function parameter or member 'buf' not described in 'write_v4_end_grace'
fs/nfsd/nfsctl.c:1125: warning: Function parameter or member 'size' not described in 'write_v4_end_grace'
fs/nfsd/nfs4proc.c:1164: warning: Function parameter or member 'nss' not described in 'nfsd4_interssc_connect'
fs/nfsd/nfs4proc.c:1164: warning: Function parameter or member 'rqstp' not described in 'nfsd4_interssc_connect'
fs/nfsd/nfs4proc.c:1164: warning: Function parameter or member 'mount' not described in 'nfsd4_interssc_connect'
fs/nfsd/nfs4proc.c:1262: warning: Function parameter or member 'rqstp' not described in 'nfsd4_setup_inter_ssc'
fs/nfsd/nfs4proc.c:1262: warning: Function parameter or member 'cstate' not described in 'nfsd4_setup_inter_ssc'
fs/nfsd/nfs4proc.c:1262: warning: Function parameter or member 'copy' not described in 'nfsd4_setup_inter_ssc'
fs/nfsd/nfs4proc.c:1262: warning: Function parameter or member 'mount' not described in 'nfsd4_setup_inter_ssc'
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Clean up: Fix gcc empty-body warning when -Wextra is used.
../fs/nfsd/nfs4state.c:3898:3: warning: suggest braces around empty body in an ‘else’ statement [-Wempty-body]
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Capture obvious events and replace dprintk() call sites. Introduce
infrastructure so that adding more tracepoints in this code later
is simplified.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Try to capture DRC failures.
Two additional clean-ups:
- Introduce Doxygen-style comments for the main entry points
- Remove a dprintk that fires for an allocation failure. This was
the only dprintk in the REPCACHE class.
Reported-by: kbuild test robot <lkp@intel.com>
[ cel: force typecast for display of checksum values ]
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Pull execve fix from Eric Biederman:
"While working on my exec cleanups I found a bug in exec that I
introduced by accident a couple of years ago. I apparently missed the
fact that bprm->file can change.
Now I have a very personal motive to clean up exec and make it more
approachable.
The change is just moving woud_dump to where it acts on the final
bprm->file not the initial bprm->file. I have been careful and tested
and verify this fix works"
* 'exec-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace:
exec: Move would_dump into flush_old_exec
I goofed when I added mm->user_ns support to would_dump. I missed the
fact that in the case of binfmt_loader, binfmt_em86, binfmt_misc, and
binfmt_script bprm->file is reassigned. Which made the move of
would_dump from setup_new_exec to __do_execve_file before exec_binprm
incorrect as it can result in would_dump running on the script instead
of the interpreter of the script.
The net result is that the code stopped making unreadable interpreters
undumpable. Which allows them to be ptraced and written to disk
without special permissions. Oops.
The move was necessary because the call in set_new_exec was after
bprm->mm was no longer valid.
To correct this mistake move the misplaced would_dump from
__do_execve_file into flos_old_exec, before exec_mmap is called.
I tested and confirmed that without this fix I can attach with gdb to
a script with an unreadable interpreter, and with this fix I can not.
Cc: stable@vger.kernel.org
Fixes: f84df2a6f2 ("exec: Ensure mm->user_ns contains the execed files")
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
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Merge tag 'io_uring-5.7-2020-05-15' of git://git.kernel.dk/linux-block
Pull io_uring fixes from Jens Axboe:
"Two small fixes that should go into this release:
- Check and handle zero length splice (Pavel)
- Fix a regression in this merge window for fixed files used with
polled block IO"
* tag 'io_uring-5.7-2020-05-15' of git://git.kernel.dk/linux-block:
io_uring: polled fixed file must go through free iteration
io_uring: fix zero len do_splice()
Highlights include:
Stable fixes:
- nfs: fix NULL deference in nfs4_get_valid_delegation
Bugfixes:
- Fix corruption of the return value in cachefiles_read_or_alloc_pages()
- Fix several fscache cookie issues
- Fix a fscache queuing race that can trigger a BUG_ON
- NFS: Fix 2 use-after-free regressions due to the RPC_TASK_CRED_NOREF flag
- SUNRPC: Fix a use-after-free regression in rpc_free_client_work()
- SUNRPC: Fix a race when tearing down the rpc client debugfs directory
- SUNRPC: Signalled ASYNC tasks need to exit
- NFSv3: fix rpc receive buffer size for MOUNT call
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Merge tag 'nfs-for-5.7-5' of git://git.linux-nfs.org/projects/trondmy/linux-nfs
Pull NFS client bugfixes from Trond Myklebust:
"Highlights include:
Stable fixes:
- nfs: fix NULL deference in nfs4_get_valid_delegation
Bugfixes:
- Fix corruption of the return value in cachefiles_read_or_alloc_pages()
- Fix several fscache cookie issues
- Fix a fscache queuing race that can trigger a BUG_ON
- NFS: Fix two use-after-free regressions due to the RPC_TASK_CRED_NOREF flag
- SUNRPC: Fix a use-after-free regression in rpc_free_client_work()
- SUNRPC: Fix a race when tearing down the rpc client debugfs directory
- SUNRPC: Signalled ASYNC tasks need to exit
- NFSv3: fix rpc receive buffer size for MOUNT call"
* tag 'nfs-for-5.7-5' of git://git.linux-nfs.org/projects/trondmy/linux-nfs:
NFSv3: fix rpc receive buffer size for MOUNT call
SUNRPC: 'Directory with parent 'rpc_clnt' already present!'
NFS/pnfs: Don't use RPC_TASK_CRED_NOREF with pnfs
NFS: Don't use RPC_TASK_CRED_NOREF with delegreturn
SUNRPC: Signalled ASYNC tasks need to exit
nfs: fix NULL deference in nfs4_get_valid_delegation
SUNRPC: fix use-after-free in rpc_free_client_work()
cachefiles: Fix race between read_waiter and read_copier involving op->to_do
NFSv4: Fix fscache cookie aux_data to ensure change_attr is included
NFS: Fix fscache super_cookie allocation
NFS: Fix fscache super_cookie index_key from changing after umount
cachefiles: Fix corruption of the return value in cachefiles_read_or_alloc_pages()
Failed async writes that are requeued may not clean up a refcount
on the file, which can result in a leaked open. This scenario arises
very reliably when using persistent handles and a reconnect occurs
while writing.
cifs_writev_requeue only releases the reference if the write fails
(rc != 0). The server->ops->async_writev operation will take its own
reference, so the initial reference can always be released.
Signed-off-by: Adam McCoy <adam@forsedomani.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
CC: Stable <stable@vger.kernel.org>
Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com>
Prior to commit e3d3ab64dd66 ("SUNRPC: Use au_rslack when
computing reply buffer size"), there was enough slack in the reply
buffer to commodate filehandles of size 60bytes. However, the real
problem was that the reply buffer size for the MOUNT operation was
not correctly calculated. Received buffer size used the filehandle
size for NFSv2 (32bytes) which is much smaller than the allowed
filehandle size for the v3 mounts.
Fix the reply buffer size (decode arguments size) for the MNT command.
Fixes: 2c94b8eca1 ("SUNRPC: Use au_rslack when computing reply buffer size")
Signed-off-by: Olga Kornievskaia <kolga@netapp.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
There is a possible race when ep_scan_ready_list() leaves ->rdllist and
->obflist empty for a short period of time although some events are
pending. It is quite likely that ep_events_available() observes empty
lists and goes to sleep.
Since commit 339ddb53d3 ("fs/epoll: remove unnecessary wakeups of
nested epoll") we are conservative in wakeups (there is only one place
for wakeup and this is ep_poll_callback()), thus ep_events_available()
must always observe correct state of two lists.
The easiest and correct way is to do the final check under the lock.
This does not impact the performance, since lock is taken anyway for
adding a wait entry to the wait queue.
The discussion of the problem can be found here:
https://lore.kernel.org/linux-fsdevel/a2f22c3c-c25a-4bda-8339-a7bdaf17849e@akamai.com/
In this patch barrierless __set_current_state() is used. This is safe
since waitqueue_active() is called under the same lock on wakeup side.
Short-circuit for fatal signals (i.e. fatal_signal_pending() check) is
moved to the line just before actual events harvesting routine. This is
fully compliant to what is said in the comment of the patch where the
actual fatal_signal_pending() check was added: c257a340ed ("fs, epoll:
short circuit fetching events if thread has been killed").
Fixes: 339ddb53d3 ("fs/epoll: remove unnecessary wakeups of nested epoll")
Reported-by: Jason Baron <jbaron@akamai.com>
Reported-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Roman Penyaev <rpenyaev@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Jason Baron <jbaron@akamai.com>
Cc: Khazhismel Kumykov <khazhy@google.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: <stable@vger.kernel.org>
Link: http://lkml.kernel.org/r/20200505145609.1865152-1-rpenyaev@suse.de
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
When we changed the file registration handling, it became important to
iterate the bulk request freeing list for fixed files as well, or we
miss dropping the fixed file reference. If not, we're leaking references,
and we'll get a kworker stuck waiting for file references to disappear.
This also means we can remove the special casing of fixed vs non-fixed
files, we need to iterate for both and we can just rely on
__io_req_aux_free() doing io_put_file() instead of doing it manually.
Fixes: 0558955373 ("io_uring: refactor file register/unregister/update handling")
Signed-off-by: Jens Axboe <axboe@kernel.dk>
When we're doing pnfs then the credential being used for the RPC call
is not necessarily the same as the one used in the open context, so
don't use RPC_TASK_CRED_NOREF.
Fixes: 6129650720 ("NFSv4: Avoid referencing the cred unnecessarily during NFSv4 I/O")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Fixes for bugs prior to v5.7-rc1:
- Fix random block reads when reading fragmented journals (v5.2).
- Fix a possible random memory access in gfs2_walk_metadata (v5.3).
Fixes for v5.7-rc1:
- Fix several overlooked gfs2_qa_get / gfs2_qa_put imbalances.
- Fix several bugs in the new filesystem withdraw logic.
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Merge tag 'gfs2-v5.7-rc1.fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2
Pull gfs2 fixes from Andreas Gruenbacher:
"Various gfs2 fixes.
Fixes for bugs prior to v5.7:
- Fix random block reads when reading fragmented journals (v5.2)
- Fix a possible random memory access in gfs2_walk_metadata (v5.3)
Fixes for v5.7:
- Fix several overlooked gfs2_qa_get / gfs2_qa_put imbalances
- Fix several bugs in the new filesystem withdraw logic"
* tag 'gfs2-v5.7-rc1.fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2:
Revert "gfs2: Don't demote a glock until its revokes are written"
gfs2: If go_sync returns error, withdraw but skip invalidate
gfs2: Grab glock reference sooner in gfs2_add_revoke
gfs2: don't call quota_unhold if quotas are not locked
gfs2: move privileged user check to gfs2_quota_lock_check
gfs2: remove check for quotas on in gfs2_quota_check
gfs2: Change BUG_ON to an assert_withdraw in gfs2_quota_change
gfs2: Fix problems regarding gfs2_qa_get and _put
gfs2: More gfs2_find_jhead fixes
gfs2: Another gfs2_walk_metadata fix
gfs2: Fix use-after-free in gfs2_logd after withdraw
gfs2: Fix BUG during unmount after file system withdraw
gfs2: Fix error exit in do_xmote
gfs2: fix withdraw sequence deadlock
We are not guaranteed that the credential will remain pinned.
Fixes: 6129650720 ("NFSv4: Avoid referencing the cred unnecessarily during NFSv4 I/O")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
(1) The reorganisation of bmap() use accidentally caused the return value
of cachefiles_read_or_alloc_pages() to get corrupted.
(2) The NFS superblock index key accidentally got changed to include a
number of kernel pointers - meaning that the key isn't matchable after
a reboot.
(3) A redundant check in nfs_fscache_get_super_cookie().
(4) The NFS change_attr sometimes set in the auxiliary data for the
caching of an file and sometimes not, which causes the cache to get
discarded when it shouldn't.
(5) There's a race between cachefiles_read_waiter() and
cachefiles_read_copier() that causes an occasional assertion failure.
We add the new state to the nfsi->open_states list, making it
potentially visible to other threads, before we've finished initializing
it.
That wasn't a problem when all the readers were also taking the i_lock
(as we do here), but since we switched to RCU, there's now a possibility
that a reader could see the partially initialized state.
Symptoms observed were a crash when another thread called
nfs4_get_valid_delegation() on a NULL inode, resulting in an oops like:
BUG: unable to handle page fault for address: ffffffffffffffb0 ...
RIP: 0010:nfs4_get_valid_delegation+0x6/0x30 [nfsv4] ...
Call Trace:
nfs4_open_prepare+0x80/0x1c0 [nfsv4]
__rpc_execute+0x75/0x390 [sunrpc]
? finish_task_switch+0x75/0x260
rpc_async_schedule+0x29/0x40 [sunrpc]
process_one_work+0x1ad/0x370
worker_thread+0x30/0x390
? create_worker+0x1a0/0x1a0
kthread+0x10c/0x130
? kthread_park+0x80/0x80
ret_from_fork+0x22/0x30
Fixes: 9ae075fdd1 "NFSv4: Convert open state lookup to use RCU"
Reviewed-by: Seiichi Ikarashi <s.ikarashi@fujitsu.com>
Tested-by: Daisuke Matsuda <matsuda-daisuke@fujitsu.com>
Tested-by: Masayoshi Mizuma <m.mizuma@jp.fujitsu.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Cc: stable@vger.kernel.org # v4.20+
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Fix warning:
fs/nfsd/nfssvc.c:604:6: warning: old-style function definition [-Wold-style-definition]
bool i_am_nfsd()
^~~~~~~~~
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Ma Feng <mafeng.ma@huawei.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
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Merge tag 'block-5.7-2020-05-09' of git://git.kernel.dk/linux-block
Pull block fixes from Jens Axboe:
- a small series fixing a use-after-free of bdi name (Christoph,Yufen)
- NVMe fix for a regression with the smaller CQ update (Alexey)
- NVMe fix for a hang at namespace scanning error recovery (Sagi)
- fix race with blk-iocost iocg->abs_vdebt updates (Tejun)
* tag 'block-5.7-2020-05-09' of git://git.kernel.dk/linux-block:
nvme: fix possible hang when ns scanning fails during error recovery
nvme-pci: fix "slimmer CQ head update"
bdi: add a ->dev_name field to struct backing_dev_info
bdi: use bdi_dev_name() to get device name
bdi: move bdi_dev_name out of line
vboxsf: don't use the source name in the bdi name
iocost: protect iocg->abs_vdebt with iocg->waitq.lock
Use the common interface bdi_dev_name() to get device name.
Signed-off-by: Yufen Yu <yuyufen@huawei.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Add missing <linux/backing-dev.h> include BFQ
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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Merge tag 'io_uring-5.7-2020-05-08' of git://git.kernel.dk/linux-block
Pull io_uring fixes from Jens Axboe:
- Fix finish_wait() balancing in file cancelation (Xiaoguang)
- Ensure early cleanup of resources in ring map failure (Xiaoguang)
- Ensure IORING_OP_SLICE does the right file mode checks (Pavel)
- Remove file opening from openat/openat2/statx, it's not needed and
messes with O_PATH
* tag 'io_uring-5.7-2020-05-08' of git://git.kernel.dk/linux-block:
io_uring: don't use 'fd' for openat/openat2/statx
splice: move f_mode checks to do_{splice,tee}()
io_uring: handle -EFAULT properly in io_uring_setup()
io_uring: fix mismatched finish_wait() calls in io_uring_cancel_files()
do_splice() doesn't expect len to be 0. Just always return 0 in this
case as splice(2) does.
Fixes: 7d67af2c01 ("io_uring: add splice(2) support")
Reported-by: Jann Horn <jannh@google.com>
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
We currently revoke read delegations on any write open or any operation
that modifies file data or metadata (including rename, link, and
unlink). But if the delegation in question is the only read delegation
and is held by the client performing the operation, that's not really
necessary.
It's not always possible to prevent this in the NFSv4.0 case, because
there's not always a way to determine which client an NFSv4.0 delegation
came from. (In theory we could try to guess this from the transport
layer, e.g., by assuming all traffic on a given TCP connection comes
from the same client. But that's not really correct.)
In the NFSv4.1 case the session layer always tells us the client.
This patch should remove such self-conflicts in all cases where we can
reliably determine the client from the compound.
To do that we need to track "who" is performing a given (possibly
lease-breaking) file operation. We're doing that by storing the
information in the svc_rqst and using kthread_data() to map the current
task back to a svc_rqst.
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Commit 402cb8dda9 ("fscache: Attach the index key and aux data to
the cookie") added the aux_data and aux_data_len to parameters to
fscache_acquire_cookie(), and updated the callers in the NFS client.
In the process it modified the aux_data to include the change_attr,
but missed adding change_attr to a couple places where aux_data was
used. Specifically, when opening a file and the change_attr is not
added, the following attempt to lookup an object will fail inside
cachefiles_check_object_xattr() = -116 due to
nfs_fscache_inode_check_aux() failing memcmp on auxdata and returning
FSCACHE_CHECKAUX_OBSOLETE.
Fix this by adding nfs_fscache_update_auxdata() to set the auxdata
from all relevant fields in the inode, including the change_attr.
Fixes: 402cb8dda9 ("fscache: Attach the index key and aux data to the cookie")
Signed-off-by: Dave Wysochanski <dwysocha@redhat.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Commit f2aedb713c ("NFS: Add fs_context support.") reworked
NFS mount code paths for fs_context support which included
super_block initialization. In the process there was an extra
return left in the code and so we never call
nfs_fscache_get_super_cookie even if 'fsc' is given on as mount
option. In addition, there is an extra check inside
nfs_fscache_get_super_cookie for the NFS_OPTION_FSCACHE which
is unnecessary since the only caller nfs_get_cache_cookie
checks this flag.
Fixes: f2aedb713c ("NFS: Add fs_context support.")
Signed-off-by: Dave Wysochanski <dwysocha@redhat.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Commit 402cb8dda9 ("fscache: Attach the index key and aux data to
the cookie") added the index_key and index_key_len parameters to
fscache_acquire_cookie(), and updated the callers in the NFS client.
One of the callers was inside nfs_fscache_get_super_cookie()
and was changed to use the full struct nfs_fscache_key as the
index_key. However, a couple members of this structure contain
pointers and thus will change each time the same NFS share is
remounted. Since index_key is used for fscache_cookie->key_hash
and this subsequently is used to compare cookies, the effectiveness
of fscache with NFS is reduced to the point at which a umount
occurs. Any subsequent remount of the same share will cause a
unique NFS super_block index_key and key_hash to be generated for
the same data, rendering any prior fscache data unable to be
found. A simple reproducer demonstrates the problem.
1. Mount share with 'fsc', create a file, drop page cache
systemctl start cachefilesd
mount -o vers=3,fsc 127.0.0.1:/export /mnt
dd if=/dev/zero of=/mnt/file1.bin bs=4096 count=1
echo 3 > /proc/sys/vm/drop_caches
2. Read file into page cache and fscache, then unmount
dd if=/mnt/file1.bin of=/dev/null bs=4096 count=1
umount /mnt
3. Remount and re-read which should come from fscache
mount -o vers=3,fsc 127.0.0.1:/export /mnt
echo 3 > /proc/sys/vm/drop_caches
dd if=/mnt/file1.bin of=/dev/null bs=4096 count=1
4. Check for READ ops in mountstats - there should be none
grep READ: /proc/self/mountstats
Looking at the history and the removed function, nfs_super_get_key(),
we should only use nfs_fscache_key.key plus any uniquifier, for
the fscache index_key.
Fixes: 402cb8dda9 ("fscache: Attach the index key and aux data to the cookie")
Signed-off-by: Dave Wysochanski <dwysocha@redhat.com>
Signed-off-by: David Howells <dhowells@redhat.com>
This reverts commit df5db5f9ee.
This patch fixes a regression: patch df5db5f9ee allowed function
run_queue() to bypass its call to do_xmote() if revokes were queued for
the glock. That's wrong because its call to do_xmote() is what is
responsible for calling the go_sync() glops functions to sync both
the ail list and any revokes queued for it. By bypassing the call,
gfs2 could get into a stand-off where the glock could not be demoted
until its revokes are written back, but the revokes would not be
written back because do_xmote() was never called.
It "sort of" works, however, because there are other mechanisms like
the log flush daemon (logd) that can sync the ail items and revokes,
if it deems it necessary. The problem is: without file system pressure,
it might never deem it necessary.
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Before this patch, if the go_sync operation returned an error during
the do_xmote process (such as unable to sync metadata to the journal)
the code did goto out. That kept the glock locked, so it could not be
given away, which correctly avoids file system corruption. However,
it never set the withdraw bit or requeueing the glock work. So it would
hang forever, unable to ever demote the glock.
This patch changes to goto to a new label, skip_inval, so that errors
from go_sync are treated the same way as errors from go_inval:
The delayed withdraw bit is set and the work is requeued. That way,
the logd should eventually figure out there's a problem and withdraw
properly there.
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
big-endian arches, a spammy log message and a couple error paths.
Also included a MAINTAINERS update.
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Merge tag 'ceph-for-5.7-rc5' of git://github.com/ceph/ceph-client
Pull ceph fixes from Ilya Dryomov:
"Fixes for an endianness handling bug that prevented mounts on
big-endian arches, a spammy log message and a couple error paths.
Also included a MAINTAINERS update"
* tag 'ceph-for-5.7-rc5' of git://github.com/ceph/ceph-client:
ceph: demote quotarealm lookup warning to a debug message
MAINTAINERS: remove myself as ceph co-maintainer
ceph: fix double unlock in handle_cap_export()
ceph: fix special error code in ceph_try_get_caps()
ceph: fix endianness bug when handling MDS session feature bits
This patch rearranges gfs2_add_revoke so that the extra glock
reference is added earlier on in the function to avoid races in which
the glock is freed before the new reference is taken.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Before this patch, function gfs2_quota_unlock checked if quotas are
turned off, and if so, it branched to label out, which called
gfs2_quota_unhold. With the new system of gfs2_qa_get and put, we
no longer want to call gfs2_quota_unhold or we won't balance our
gets and puts.
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Before this patch, function gfs2_quota_lock checked if it was called
from a privileged user, and if so, it bypassed the quota check:
superuser can operate outside the quotas.
That's the wrong place for the check because the lock/unlock functions
are separate from the lock_check function, and you can do lock and
unlock without actually checking the quotas.
This patch moves the check to gfs2_quota_lock_check.
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
This patch removes a check from gfs2_quota_check for whether quotas
are enabled by the superblock. There is a test just prior for the
GIF_QD_LOCKED bit in the inode, and that can only be set by functions
that already check that quotas are enabled in the superblock.
Therefore, the check is redundant.
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Before this patch, gfs2_quota_change() would BUG_ON if the
qa_ref counter was not a positive number. This patch changes it to
be a withdraw instead. That way we can debug things more easily.
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
This patch fixes a couple of places in which gfs2_qa_get and gfs2_qa_put are
not balanced: we now keep references around whenever a file is open for writing
(see gfs2_open_common and gfs2_release), so we need to put all references we
grab in function gfs2_create_inode. This was broken in the successful case and
on one error path.
This also means that we don't have a reference to put in gfs2_evict_inode.
In addition, gfs2_qa_put was called for the wrong inode in gfs2_link.
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
A misconfigured cephx can easily result in having the kernel client
flooding the logs with:
ceph: Can't lookup inode 1 (err: -13)
Change this message to debug level.
Cc: stable@vger.kernel.org
URL: https://tracker.ceph.com/issues/44546
Signed-off-by: Luis Henriques <lhenriques@suse.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Here are a number of small driver core fixes for 5.7-rc5 to resolve a
bunch of reported issues with the current tree.
Biggest here are the reverts and patches from John Stultz to resolve a
bunch of deferred probe regressions we have been seeing in 5.7-rc right
now.
Along with those are some other smaller fixes:
- coredump crash fix
- devlink fix for when permissive mode was enabled
- amba and platform device dma_parms fixes
- component error silenced for when deferred probe happens
All of these have been in linux-next for a while with no reported
issues.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge tag 'driver-core-5.7-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core
Pull driver core fixes from Greg KH:
"Here are a number of small driver core fixes for 5.7-rc5 to resolve a
bunch of reported issues with the current tree.
Biggest here are the reverts and patches from John Stultz to resolve a
bunch of deferred probe regressions we have been seeing in 5.7-rc
right now.
Along with those are some other smaller fixes:
- coredump crash fix
- devlink fix for when permissive mode was enabled
- amba and platform device dma_parms fixes
- component error silenced for when deferred probe happens
All of these have been in linux-next for a while with no reported
issues"
* tag 'driver-core-5.7-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core:
regulator: Revert "Use driver_deferred_probe_timeout for regulator_init_complete_work"
driver core: Ensure wait_for_device_probe() waits until the deferred_probe_timeout fires
driver core: Use dev_warn() instead of dev_WARN() for deferred_probe_timeout warnings
driver core: Revert default driver_deferred_probe_timeout value to 0
component: Silence bind error on -EPROBE_DEFER
driver core: Fix handling of fw_devlink=permissive
coredump: fix crash when umh is disabled
amba: Initialize dma_parms for amba devices
driver core: platform: Initialize dma_parms for platform devices
Merge misc fixes from Andrew Morton:
"14 fixes and one selftest to verify the ipc fixes herein"
* emailed patches from Andrew Morton <akpm@linux-foundation.org>:
mm: limit boost_watermark on small zones
ubsan: disable UBSAN_ALIGNMENT under COMPILE_TEST
mm/vmscan: remove unnecessary argument description of isolate_lru_pages()
epoll: atomically remove wait entry on wake up
kselftests: introduce new epoll60 testcase for catching lost wakeups
percpu: make pcpu_alloc() aware of current gfp context
mm/slub: fix incorrect interpretation of s->offset
scripts/gdb: repair rb_first() and rb_last()
eventpoll: fix missing wakeup for ovflist in ep_poll_callback
arch/x86/kvm/svm/sev.c: change flag passed to GUP fast in sev_pin_memory()
scripts/decodecode: fix trapping instruction formatting
kernel/kcov.c: fix typos in kcov_remote_start documentation
mm/page_alloc: fix watchdog soft lockups during set_zone_contiguous()
mm, memcg: fix error return value of mem_cgroup_css_alloc()
ipc/mqueue.c: change __do_notify() to bypass check_kill_permission()
It turns out that when extending an existing bio, gfs2_find_jhead fails to
check if the block number is consecutive, which leads to incorrect reads for
fragmented journals.
In addition, limit the maximum bio size to an arbitrary value of 2 megabytes:
since commit 07173c3ec2 ("block: enable multipage bvecs"), if we just keep
adding pages until bio_add_page fails, bios will grow much larger than useful,
which pins more memory than necessary with barely any additional performance
gains.
Fixes: f4686c26ec ("gfs2: read journal in large chunks")
Cc: stable@vger.kernel.org # v5.2+
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Make sure we don't walk past the end of the metadata in gfs2_walk_metadata: the
inode holds fewer pointers than indirect blocks.
Slightly clean up gfs2_iomap_get.
Fixes: a27a0c9b6a ("gfs2: gfs2_walk_metadata fix")
Cc: stable@vger.kernel.org # v5.3+
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
When the gfs2_logd daemon withdrew, the withdraw sequence called
into make_fs_ro() to make the file system read-only. That caused the
journal descriptors to be freed. However, those journal descriptors
were used by gfs2_logd's call to gfs2_ail_flush_reqd(). This caused
a use-after free and NULL pointer dereference.
This patch changes function gfs2_logd() so that it stops all logd
work until the thread is told to stop. Once a withdraw is done,
it only does an interruptible sleep.
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Before this patch, when the logd daemon was forced to withdraw, it
would try to request its journal be recovered by another cluster node.
However, in single-user cases with lock_nolock, there are no other
nodes to recover the journal. Function signal_our_withdraw() was
recognizing the lock_nolock situation, but not until after it had
evicted its journal inode. Since the journal descriptor that points
to the inode was never removed from the master list, when the unmount
occurred, it did another iput on the evicted inode, which resulted in
a BUG_ON(inode->i_state & I_CLEAR).
This patch moves the check for this situation earlier in function
signal_our_withdraw(), which avoids the extra iput, so the unmount
may happen normally.
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
