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2020-02-06fuse: Support RENAME_WHITEOUT flagVivek Goyal1-1/+1
Allow fuse to pass RENAME_WHITEOUT to fuse server. Overlayfs on top of virtiofs uses RENAME_WHITEOUT. Without this patch renaming a directory in overlayfs (dir is on lower) fails with -EINVAL. With this patch it works. Signed-off-by: Vivek Goyal <vgoyal@redhat.com> Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
2020-02-06fuse: don't overflow LLONG_MAX with end offsetMiklos Szeredi1-0/+12
Handle the special case of fuse_readpages() wanting to read the last page of a hugest file possible and overflowing the end offset in the process. This is basically to unbreak xfstests:generic/525 and prevent filesystems from doing bad things with an overflowing offset. Reported-by: Xiao Yang <ice_yangxiao@163.com> Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
2020-02-06fix up iter on short count in fuse_direct_io()Miklos Szeredi1-1/+4
fuse_direct_io() can end up advancing the iterator by more than the amount of data read or written. This case is handled by the generic code if going through ->direct_IO(), but not in the FOPEN_DIRECT_IO case. Fix by reverting the extra bytes from the iterator in case of error or a short count. To test: install lxcfs, then the following testcase int fd = open("/var/lib/lxcfs/proc/uptime", O_RDONLY); sendfile(1, fd, NULL, 16777216); sendfile(1, fd, NULL, 16777216); will spew WARN_ON() in iov_iter_pipe(). Reported-by: Peter Geis <pgwipeout@gmail.com> Reported-by: Al Viro <viro@zeniv.linux.org.uk> Fixes: 3c3db095b68c ("fuse: use iov_iter based generic splice helpers") Cc: <stable@vger.kernel.org> # v5.1 Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
2020-02-06cifs: add SMB3 change notification supportSteve French5-0/+87
A commonly used SMB3 feature is change notification, allowing an app to be notified about changes to a directory. The SMB3 Notify request blocks until the server detects a change to that directory or its contents that matches the completion flags that were passed in and the "watch_tree" flag (which indicates whether subdirectories under this directory should be also included). See MS-SMB2 2.2.35 for additional detail. To use this simply pass in the following structure to ioctl: struct __attribute__((__packed__)) smb3_notify { uint32_t completion_filter; bool watch_tree; } __packed; using CIFS_IOC_NOTIFY 0x4005cf09 or equivalently _IOW(CIFS_IOCTL_MAGIC, 9, struct smb3_notify) SMB3 change notification is supported by all major servers. The ioctl will block until the server detects a change to that directory or its subdirectories (if watch_tree is set). Signed-off-by: Steve French <stfrench@microsoft.com> Reviewed-by: Aurelien Aptel <aaptel@suse.com> Acked-by: Paulo Alcantara (SUSE) <pc@cjr.nz>
2020-02-06cifs: make multichannel warning more visibleAurelien Aptel1-1/+1
When no interfaces are returned by the server we cannot open multiple channels. Make it more obvious by reporting that to the user at the VFS log level. Signed-off-by: Aurelien Aptel <aaptel@suse.com> Signed-off-by: Steve French <stfrench@microsoft.com>
2020-02-06cifs: fix soft mounts hanging in the reconnect codeRonnie Sahlberg1-1/+1
RHBZ: 1795423 This is the SMB1 version of a patch we already have for SMB2 In recent DFS updates we have a new variable controlling how many times we will retry to reconnect the share. If DFS is not used, then this variable is initialized to 0 in: static inline int dfs_cache_get_nr_tgts(const struct dfs_cache_tgt_list *tl) { return tl ? tl->tl_numtgts : 0; } This means that in the reconnect loop in smb2_reconnect() we will immediately wrap retries to -1 and never actually get to pass this conditional: if (--retries) continue; The effect is that we no longer reach the point where we fail the commands with -EHOSTDOWN and basically the kernel threads are virtually hung and unkillable. Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com> Signed-off-by: Steve French <stfrench@microsoft.com> Reviewed-by: Aurelien Aptel <aaptel@suse.com> Reviewed-by: Paulo Alcantara (SUSE) <pc@cjr.nz>
2020-02-06Merge tag 'ceph-for-5.6-rc1' of https://github.com/ceph/ceph-clientLinus Torvalds14-175/+436
Pull ceph fixes from Ilya Dryomov: - a set of patches that fixes various corner cases in mount and umount code (Xiubo Li). This has to do with choosing an MDS, distinguishing between laggy and down MDSes and parsing the server path. - inode initialization fixes (Jeff Layton). The one included here mostly concerns things like open_by_handle() and there is another one that will come through Al. - copy_file_range() now uses the new copy-from2 op (Luis Henriques). The existing copy-from op turned out to be infeasible for generic filesystem use; we disable the copy offload if OSDs don't support copy-from2. - a patch to link "rbd" and "block" devices together in sysfs (Hannes Reinecke) ... and a smattering of cleanups from Xiubo, Jeff and Chengguang. * tag 'ceph-for-5.6-rc1' of https://github.com/ceph/ceph-client: (25 commits) rbd: set the 'device' link in sysfs ceph: move net/ceph/ceph_fs.c to fs/ceph/util.c ceph: print name of xattr in __ceph_{get,set}xattr() douts ceph: print r_direct_hash in hex in __choose_mds() dout ceph: use copy-from2 op in copy_file_range ceph: close holes in structs ceph_mds_session and ceph_mds_request rbd: work around -Wuninitialized warning ceph: allocate the correct amount of extra bytes for the session features ceph: rename get_session and switch to use ceph_get_mds_session ceph: remove the extra slashes in the server path ceph: add possible_max_rank and make the code more readable ceph: print dentry offset in hex and fix xattr_version type ceph: only touch the caps which have the subset mask requested ceph: don't clear I_NEW until inode metadata is fully populated ceph: retry the same mds later after the new session is opened ceph: check availability of mds cluster on mount after wait timeout ceph: keep the session state until it is released ceph: add __send_request helper ceph: ensure we have a new cap before continuing in fill_inode ceph: drop unused ttl_from parameter from fill_inode ...
2020-02-06Merge tag 'xfs-5.6-merge-8' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linuxLinus Torvalds27-365/+278
Pull moar xfs updates from Darrick Wong: "This contains the buffer error code refactoring I mentioned last week, now that it has had extra time to complete the full xfs fuzz testing suite to make sure there aren't any obvious new bugs" * tag 'xfs-5.6-merge-8' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux: xfs: fix xfs_buf_ioerror_alert location reporting xfs: remove unnecessary null pointer checks from _read_agf callers xfs: make xfs_*read_agf return EAGAIN to ALLOC_FLAG_TRYLOCK callers xfs: remove the xfs_btree_get_buf[ls] functions xfs: make xfs_trans_get_buf return an error code xfs: make xfs_trans_get_buf_map return an error code xfs: make xfs_buf_read return an error code xfs: make xfs_buf_get_uncached return an error code xfs: make xfs_buf_get return an error code xfs: make xfs_buf_read_map return an error code xfs: make xfs_buf_get_map return an error code xfs: make xfs_buf_alloc return an error code
2020-02-06Merge tag 'trace-v5.6-2' of ↵Linus Torvalds2-0/+90
git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace Pull tracing updates from Steven Rostedt: - Added new "bootconfig". This looks for a file appended to initrd to add boot config options, and has been discussed thoroughly at Linux Plumbers. Very useful for adding kprobes at bootup. Only enabled if "bootconfig" is on the real kernel command line. - Created dynamic event creation. Merges common code between creating synthetic events and kprobe events. - Rename perf "ring_buffer" structure to "perf_buffer" - Rename ftrace "ring_buffer" structure to "trace_buffer" Had to rename existing "trace_buffer" to "array_buffer" - Allow trace_printk() to work withing (some) tracing code. - Sort of tracing configs to be a little better organized - Fixed bug where ftrace_graph hash was not being protected properly - Various other small fixes and clean ups * tag 'trace-v5.6-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace: (88 commits) bootconfig: Show the number of nodes on boot message tools/bootconfig: Show the number of bootconfig nodes bootconfig: Add more parse error messages bootconfig: Use bootconfig instead of boot config ftrace: Protect ftrace_graph_hash with ftrace_sync ftrace: Add comment to why rcu_dereference_sched() is open coded tracing: Annotate ftrace_graph_notrace_hash pointer with __rcu tracing: Annotate ftrace_graph_hash pointer with __rcu bootconfig: Only load bootconfig if "bootconfig" is on the kernel cmdline tracing: Use seq_buf for building dynevent_cmd string tracing: Remove useless code in dynevent_arg_pair_add() tracing: Remove check_arg() callbacks from dynevent args tracing: Consolidate some synth_event_trace code tracing: Fix now invalid var_ref_vals assumption in trace action tracing: Change trace_boot to use synth_event interface tracing: Move tracing selftests to bottom of menu tracing: Move mmio tracer config up with the other tracers tracing: Move tracing test module configs together tracing: Move all function tracing configs together tracing: Documentation for in-kernel synthetic event API ...
2020-02-06Merge tag 'io_uring-5.6-2020-02-05' of git://git.kernel.dk/linux-blockLinus Torvalds3-52/+237
Pull io_uring updates from Jens Axboe: "Some later fixes for io_uring: - Small cleanup series from Pavel - Belt and suspenders build time check of sqe size and layout (Stefan) - Addition of ->show_fdinfo() on request of Jann Horn, to aid in understanding mapped personalities - eventfd recursion/deadlock fix, for both io_uring and aio - Fixup for send/recv handling - Fixup for double deferral of read/write request - Fix for potential double completion event for close request - Adjust fadvise advice async/inline behavior - Fix for shutdown hang with SQPOLL thread - Fix for potential use-after-free of fixed file table" * tag 'io_uring-5.6-2020-02-05' of git://git.kernel.dk/linux-block: io_uring: cleanup fixed file data table references io_uring: spin for sq thread to idle on shutdown aio: prevent potential eventfd recursion on poll io_uring: put the flag changing code in the same spot io_uring: iterate req cache backwards io_uring: punt even fadvise() WILLNEED to async context io_uring: fix sporadic double CQE entry for close io_uring: remove extra ->file check io_uring: don't map read/write iovec potentially twice io_uring: use the proper helpers for io_send/recv io_uring: prevent potential eventfd recursion on poll eventfd: track eventfd_signal() recursion depth io_uring: add BUILD_BUG_ON() to assert the layout of struct io_uring_sqe io_uring: add ->show_fdinfo() for the io_uring file descriptor
2020-02-05cifs: Add tracepoints for errors on flush or fsyncSteve French2-2/+32
Makes it easier to debug errors on writeback that happen later, and are being returned on flush or fsync For example: writetest-17829 [002] .... 13583.407859: cifs_flush_err: ino=90 rc=-28 Signed-off-by: Steve French <stfrench@microsoft.com>
2020-02-05cifs: log warning message (once) if out of disk spaceSteve French1-0/+3
We ran into a confusing problem where an application wasn't checking return code on close and so user didn't realize that the application ran out of disk space. log a warning message (once) in these cases. For example: [ 8407.391909] Out of space writing to \\oleg-server\small-share Signed-off-by: Steve French <stfrench@microsoft.com> Reported-by: Oleg Kravtsov <oleg@tuxera.com> Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com> Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com>
2020-02-05cifs: fail i/o on soft mounts if sessionsetup errors outRonnie Sahlberg1-2/+8
RHBZ: 1579050 If we have a soft mount we should fail commands for session-setup failures (such as the password having changed/ account being deleted/ ...) and return an error back to the application. Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com> Signed-off-by: Steve French <stfrench@microsoft.com> CC: Stable <stable@vger.kernel.org>
2020-02-05smb3: fix problem with null cifs super block with previous patchSteve French2-2/+2
Add check for null cifs_sb to create_options helper Signed-off-by: Steve French <stfrench@microsoft.com> Reviewed-by: Amir Goldstein <amir73il@gmail.com> Reviewed-by: Aurelien Aptel <aaptel@suse.com>
2020-02-05Merge tag 'jfs-5.6' of git://github.com/kleikamp/linux-shaggyLinus Torvalds1-1/+0
Pull jfs update from David Kleikamp: "Trivial cleanup for jfs" * tag 'jfs-5.6' of git://github.com/kleikamp/linux-shaggy: jfs: remove unused MAXL2PAGES
2020-02-05Merge branch 'work.recursive_removal' of ↵Linus Torvalds3-210/+95
git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs Pull vfs recursive removal updates from Al Viro: "We have quite a few places where synthetic filesystems do an equivalent of 'rm -rf', with varying amounts of code duplication, wrong locking, etc. That really ought to be a library helper. Only debugfs (and very similar tracefs) are converted here - I have more conversions, but they'd never been in -next, so they'll have to wait" * 'work.recursive_removal' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: simple_recursive_removal(): kernel-side rm -rf for ramfs-style filesystems
2020-02-05Merge branch 'imm.timestamp' of ↵Linus Torvalds12-106/+61
git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs Pull vfs timestamp updates from Al Viro: "More 64bit timestamp work" * 'imm.timestamp' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: kernfs: don't bother with timestamp truncation fs: Do not overload update_time fs: Delete timespec64_trunc() fs: ubifs: Eliminate timespec64_trunc() usage fs: ceph: Delete timespec64_trunc() usage fs: cifs: Delete usage of timespec64_trunc fs: fat: Eliminate timespec64_trunc() usage utimes: Clamp the timestamps in notify_change()
2020-02-04io_uring: cleanup fixed file data table referencesJens Axboe1-13/+19
syzbot reports a use-after-free in io_ring_file_ref_switch() when it tries to switch back to percpu mode. When we put the final reference to the table by calling percpu_ref_kill_and_confirm(), we don't want the zero reference to queue async work for flushing the potentially queued up items. We currently do a few flush_work(), but they merely paper around the issue, since the work item may not have been queued yet depending on the when the percpu-ref callback gets run. Coming into the file unregister, we know we have the ring quiesced. io_ring_file_ref_switch() can check for whether or not the ref is dying or not, and not queue anything async at that point. Once the ref has been confirmed killed, flush any potential items manually. Reported-by: syzbot+7caeaea49c2c8a591e3d@syzkaller.appspotmail.com Fixes: 05f3fb3c5397 ("io_uring: avoid ring quiesce for fixed file set unregister and update") Signed-off-by: Jens Axboe <axboe@kernel.dk>
2020-02-04io_uring: spin for sq thread to idle on shutdownJens Axboe1-1/+12
As part of io_uring shutdown, we cancel work that is pending and won't necessarily complete on its own. That includes requests like poll commands and timeouts. If we're using SQPOLL for kernel side submission and we shutdown the ring immediately after queueing such work, we can race with the sqthread doing the submission. This means we may miss cancelling some work, which results in the io_uring shutdown hanging forever. Cc: stable@vger.kernel.org Signed-off-by: Jens Axboe <axboe@kernel.dk>
2020-02-04help_next should increase position indexVasily Averin1-0/+1
if seq_file .next fuction does not change position index, read after some lseek can generate unexpected output. https://bugzilla.kernel.org/show_bug.cgi?id=206283 Signed-off-by: Vasily Averin <vvs@virtuozzo.com> Signed-off-by: Mike Marshall <hubcap@omnibond.com>
2020-02-04NFSv4.0: nfs4_do_fsinfo() should not do implicit lease renewalsRobert Milkowski4-14/+11
Currently, each time nfs4_do_fsinfo() is called it will do an implicit NFS4 lease renewal, which is not compliant with the NFS4 specification. This can result in a lease being expired by an NFS server. Commit 83ca7f5ab31f ("NFS: Avoid PUTROOTFH when managing leases") introduced implicit client lease renewal in nfs4_do_fsinfo(), which can result in the NFSv4.0 lease to expire on a server side, and servers returning NFS4ERR_EXPIRED or NFS4ERR_STALE_CLIENTID. This can easily be reproduced by frequently unmounting a sub-mount, then stat'ing it to get it mounted again, which will delay or even completely prevent client from sending RENEW operations if no other NFS operations are issued. Eventually nfs server will expire client's lease and return an error on file access or next RENEW. This can also happen when a sub-mount is automatically unmounted due to inactivity (after nfs_mountpoint_expiry_timeout), then it is mounted again via stat(). This can result in a short window during which client's lease will expire on a server but not on a client. This specific case was observed on production systems. This patch removes the implicit lease renewal from nfs4_do_fsinfo(). Fixes: 83ca7f5ab31f ("NFS: Avoid PUTROOTFH when managing leases") Signed-off-by: Robert Milkowski <rmilkowski@gmail.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2020-02-04NFSv4: try lease recovery on NFS4ERR_EXPIREDRobert Milkowski1-0/+5
Currently, if an nfs server returns NFS4ERR_EXPIRED to open(), we return EIO to applications without even trying to recover. Fixes: 272289a3df72 ("NFSv4: nfs4_do_handle_exception() handle revoke/expiry of a single stateid") Signed-off-by: Robert Milkowski <rmilkowski@gmail.com> Reviewed-by: Trond Myklebust <trond.myklebust@hammerspace.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2020-02-04NFS: Fix memory leaksWenwen Wang1-2/+2
In _nfs42_proc_copy(), 'res->commit_res.verf' is allocated through kzalloc() if 'args->sync' is true. In the following code, if 'res->synchronous' is false, handle_async_copy() will be invoked. If an error occurs during the invocation, the following code will not be executed and the error will be returned . However, the allocated 'res->commit_res.verf' is not deallocated, leading to a memory leak. This is also true if the invocation of process_copy_commit() returns an error. To fix the above leaks, redirect the execution to the 'out' label if an error is encountered. Signed-off-by: Wenwen Wang <wenwen@cs.uga.edu> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2020-02-04nfs: optimise readdir cache page invalidationDai Ngo1-2/+7
When the directory is large and it's being modified by one client while another client is doing the 'ls -l' on the same directory then the cache page invalidation from nfs_force_use_readdirplus causes the reading client to keep restarting READDIRPLUS from cookie 0 which causes the 'ls -l' to take a very long time to complete, possibly never completing. Currently when nfs_force_use_readdirplus is called to switch from READDIR to READDIRPLUS, it invalidates all the cached pages of the directory. This cache page invalidation causes the next nfs_readdir to re-read the directory content from cookie 0. This patch is to optimise the cache invalidation in nfs_force_use_readdirplus by only truncating the cached pages from last page index accessed to the end the file. It also marks the inode to delay invalidating all the cached page of the directory until the next initial nfs_readdir of the next 'ls' instance. Signed-off-by: Dai Ngo <dai.ngo@oracle.com> Reviewed-by: Trond Myklebust <trond.myklebust@hammerspace.com> [Anna - Fix conflicts with Trond's readdir patches] [Anna - Remove redundant call to nfs_zap_mapping()] [Anna - Replace d_inode(file_dentry(desc->file)) with file_inode(desc->file)] Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2020-02-04Merge tag 'ovl-update-5.6' of ↵Linus Torvalds12-228/+505
git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs Pull overlayfs update from Miklos Szeredi: - Try to preserve holes in sparse files when copying up, thus saving disk space and improving performance. - Fix a performance regression introduced in v4.19 by preserving asynchronicity of IO when fowarding to underlying layers. Add VFS helpers to submit async iocbs. - Fix a regression in lseek(2) introduced in v4.19 that breaks >2G seeks on 32bit kernels. - Fix a corner case where st_ino/st_dev was not preserved across copy up. - Miscellaneous fixes and cleanups. * tag 'ovl-update-5.6' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs: ovl: fix lseek overflow on 32bit ovl: add splice file read write helper ovl: implement async IO routines vfs: add vfs_iocb_iter_[read|write] helper functions ovl: layer is const ovl: fix corner case of non-constant st_dev;st_ino ovl: fix corner case of conflicting lower layer uuid ovl: generalize the lower_fs[] array ovl: simplify ovl_same_sb() helper ovl: generalize the lower_layers[] array ovl: improving copy-up efficiency for big sparse file ovl: use ovl_inode_lock in ovl_llseek() ovl: use pr_fmt auto generate prefix ovl: fix wrong WARN_ON() in ovl_cache_update_ino()
2020-02-04treewide: remove redundant IS_ERR() before error code checkMasahiro Yamada4-4/+4
'PTR_ERR(p) == -E*' is a stronger condition than IS_ERR(p). Hence, IS_ERR(p) is unneeded. The semantic patch that generates this commit is as follows: // <smpl> @@ expression ptr; constant error_code; @@ -IS_ERR(ptr) && (PTR_ERR(ptr) == - error_code) +PTR_ERR(ptr) == - error_code // </smpl> Link: http://lkml.kernel.org/r/20200106045833.1725-1-masahiroy@kernel.org Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Cc: Julia Lawall <julia.lawall@lip6.fr> Acked-by: Stephen Boyd <sboyd@kernel.org> [drivers/clk/clk.c] Acked-by: Bartosz Golaszewski <bgolaszewski@baylibre.com> [GPIO] Acked-by: Wolfram Sang <wsa@the-dreams.de> [drivers/i2c] Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> [acpi/scan.c] Acked-by: Rob Herring <robh@kernel.org> Cc: Eric Biggers <ebiggers@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2020-02-04proc: convert everything to "struct proc_ops"Alexey Dobriyan17-144/+143
The most notable change is DEFINE_SHOW_ATTRIBUTE macro split in seq_file.h. Conversion rule is: llseek => proc_lseek unlocked_ioctl => proc_ioctl xxx => proc_xxx delete ".owner = THIS_MODULE" line [akpm@linux-foundation.org: fix drivers/isdn/capi/kcapi_proc.c] [sfr@canb.auug.org.au: fix kernel/sched/psi.c] Link: http://lkml.kernel.org/r/20200122180545.36222f50@canb.auug.org.au Link: http://lkml.kernel.org/r/20191225172546.GB13378@avx2 Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2020-02-04proc: decouple proc from VFS with "struct proc_ops"Alexey Dobriyan6-76/+79
Currently core /proc code uses "struct file_operations" for custom hooks, however, VFS doesn't directly call them. Every time VFS expands file_operations hook set, /proc code bloats for no reason. Introduce "struct proc_ops" which contains only those hooks which /proc allows to call into (open, release, read, write, ioctl, mmap, poll). It doesn't contain module pointer as well. Save ~184 bytes per usage: add/remove: 26/26 grow/shrink: 1/4 up/down: 1922/-6674 (-4752) Function old new delta sysvipc_proc_ops - 72 +72 ... config_gz_proc_ops - 72 +72 proc_get_inode 289 339 +50 proc_reg_get_unmapped_area 110 107 -3 close_pdeo 227 224 -3 proc_reg_open 289 284 -5 proc_create_data 60 53 -7 rt_cpu_seq_fops 256 - -256 ... default_affinity_proc_fops 256 - -256 Total: Before=5430095, After=5425343, chg -0.09% Link: http://lkml.kernel.org/r/20191225172228.GA13378@avx2 Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2020-02-04mm: pagewalk: add 'depth' parameter to pte_holeSteven Price1-2/+2
The pte_hole() callback is called at multiple levels of the page tables. Code dumping the kernel page tables needs to know what at what depth the missing entry is. Add this is an extra parameter to pte_hole(). When the depth isn't know (e.g. processing a vma) then -1 is passed. The depth that is reported is the actual level where the entry is missing (ignoring any folding that is in place), i.e. any levels where PTRS_PER_P?D is set to 1 are ignored. Note that depth starts at 0 for a PGD so that PUD/PMD/PTE retain their natural numbers as levels 2/3/4. Link: http://lkml.kernel.org/r/20191218162402.45610-16-steven.price@arm.com Signed-off-by: Steven Price <steven.price@arm.com> Tested-by: Zong Li <zong.li@sifive.com> Cc: Albert Ou <aou@eecs.berkeley.edu> Cc: Alexandre Ghiti <alex@ghiti.fr> Cc: Andy Lutomirski <luto@kernel.org> Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Christian Borntraeger <borntraeger@de.ibm.com> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: David S. Miller <davem@davemloft.net> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: James Hogan <jhogan@kernel.org> Cc: James Morse <james.morse@arm.com> Cc: Jerome Glisse <jglisse@redhat.com> Cc: "Liang, Kan" <kan.liang@linux.intel.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Paul Burton <paul.burton@mips.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Paul Walmsley <paul.walmsley@sifive.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Russell King <linux@armlinux.org.uk> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Vasily Gorbik <gor@linux.ibm.com> Cc: Vineet Gupta <vgupta@synopsys.com> Cc: Will Deacon <will@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2020-02-04fs/proc/page.c: allow inspection of last section and fix end detectionDavid Hildenbrand1-3/+27
If max_pfn does not fall onto a section boundary, it is possible to inspect PFNs up to max_pfn, and PFNs above max_pfn, however, max_pfn itself can't be inspected. We can have a valid (and online) memmap at and above max_pfn if max_pfn is not aligned to a section boundary. The whole early section has a memmap and is marked online. Being able to inspect the state of these PFNs is valuable for debugging, especially because max_pfn can change on memory hotplug and expose these memmaps. Also, querying page flags via "./page-types -r -a 0x144001," (tools/vm/page-types.c) inside a x86-64 guest with 4160MB under QEMU results in an (almost) endless loop in user space, because the end is not detected properly when starting after max_pfn. Instead, let's allow to inspect all pages in the highest section and return 0 directly if we try to access pages above that section. While at it, check the count before adjusting it, to avoid masking user errors. Link: http://lkml.kernel.org/r/20191211163201.17179-3-david@redhat.com Signed-off-by: David Hildenbrand <david@redhat.com> Cc: Alexey Dobriyan <adobriyan@gmail.com> Cc: Oscar Salvador <osalvador@suse.de> Cc: Michal Hocko <mhocko@kernel.org> Cc: Stephen Rothwell <sfr@canb.auug.org.au> Cc: Bob Picco <bob.picco@oracle.com> Cc: Daniel Jordan <daniel.m.jordan@oracle.com> Cc: Dan Williams <dan.j.williams@intel.com> Cc: Michal Hocko <mhocko@suse.com> Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Cc: Pavel Tatashin <pasha.tatashin@oracle.com> Cc: Steven Sistare <steven.sistare@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2020-02-04ocfs2: fix oops when writing cloned fileGang He1-8/+6
Writing a cloned file triggers a kernel oops and the user-space command process is also killed by the system. The bug can be reproduced stably via: 1) create a file under ocfs2 file system directory. journalctl -b > aa.txt 2) create a cloned file for this file. reflink aa.txt bb.txt 3) write the cloned file with dd command. dd if=/dev/zero of=bb.txt bs=512 count=1 conv=notrunc The dd command is killed by the kernel, then you can see the oops message via dmesg command. [ 463.875404] BUG: kernel NULL pointer dereference, address: 0000000000000028 [ 463.875413] #PF: supervisor read access in kernel mode [ 463.875416] #PF: error_code(0x0000) - not-present page [ 463.875418] PGD 0 P4D 0 [ 463.875425] Oops: 0000 [#1] SMP PTI [ 463.875431] CPU: 1 PID: 2291 Comm: dd Tainted: G OE 5.3.16-2-default [ 463.875433] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 [ 463.875500] RIP: 0010:ocfs2_refcount_cow+0xa4/0x5d0 [ocfs2] [ 463.875505] Code: 06 89 6c 24 38 89 eb f6 44 24 3c 02 74 be 49 8b 47 28 [ 463.875508] RSP: 0018:ffffa2cb409dfce8 EFLAGS: 00010202 [ 463.875512] RAX: ffff8b1ebdca8000 RBX: 0000000000000001 RCX: ffff8b1eb73a9df0 [ 463.875515] RDX: 0000000000056a01 RSI: 0000000000000000 RDI: 0000000000000000 [ 463.875517] RBP: 0000000000000001 R08: ffff8b1eb73a9de0 R09: 0000000000000000 [ 463.875520] R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000 [ 463.875522] R13: ffff8b1eb922f048 R14: 0000000000000000 R15: ffff8b1eb922f048 [ 463.875526] FS: 00007f8f44d15540(0000) GS:ffff8b1ebeb00000(0000) knlGS:0000000000000000 [ 463.875529] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 463.875532] CR2: 0000000000000028 CR3: 000000003c17a000 CR4: 00000000000006e0 [ 463.875546] Call Trace: [ 463.875596] ? ocfs2_inode_lock_full_nested+0x18b/0x960 [ocfs2] [ 463.875648] ocfs2_file_write_iter+0xaf8/0xc70 [ocfs2] [ 463.875672] new_sync_write+0x12d/0x1d0 [ 463.875688] vfs_write+0xad/0x1a0 [ 463.875697] ksys_write+0xa1/0xe0 [ 463.875710] do_syscall_64+0x60/0x1f0 [ 463.875743] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 463.875758] RIP: 0033:0x7f8f4482ed44 [ 463.875762] Code: 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b7 0f 1f 80 00 00 00 [ 463.875765] RSP: 002b:00007fff300a79d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 463.875769] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f8f4482ed44 [ 463.875771] RDX: 0000000000000200 RSI: 000055f771b5c000 RDI: 0000000000000001 [ 463.875774] RBP: 0000000000000200 R08: 00007f8f44af9c78 R09: 0000000000000003 [ 463.875776] R10: 000000000000089f R11: 0000000000000246 R12: 000055f771b5c000 [ 463.875779] R13: 0000000000000200 R14: 0000000000000000 R15: 000055f771b5c000 This regression problem was introduced by commit e74540b28556 ("ocfs2: protect extent tree in ocfs2_prepare_inode_for_write()"). Link: http://lkml.kernel.org/r/20200121050153.13290-1-ghe@suse.com Fixes: e74540b28556 ("ocfs2: protect extent tree in ocfs2_prepare_inode_for_write()"). Signed-off-by: Gang He <ghe@suse.com> Reviewed-by: Joseph Qi <joseph.qi@linux.alibaba.com> Cc: Mark Fasheh <mark@fasheh.com> Cc: Joel Becker <jlbec@evilplan.org> Cc: Junxiao Bi <junxiao.bi@oracle.com> Cc: Changwei Ge <gechangwei@live.cn> Cc: Jun Piao <piaojun@huawei.com> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2020-02-03saner copy_mount_options()Al Viro1-42/+7
don't bother with the byte-by-byte loops, etc. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2020-02-03aio: prevent potential eventfd recursion on pollJens Axboe1-2/+18
If we have nested or circular eventfd wakeups, then we can deadlock if we run them inline from our poll waitqueue wakeup handler. It's also possible to have very long chains of notifications, to the extent where we could risk blowing the stack. Check the eventfd recursion count before calling eventfd_signal(). If it's non-zero, then punt the signaling to async context. This is always safe, as it takes us out-of-line in terms of stack and locking context. Cc: stable@vger.kernel.org # 4.19+ Reviewed-by: Jeff Moyer <jmoyer@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2020-02-03io_uring: put the flag changing code in the same spotPavel Begunkov1-5/+4
Both iocb_flags() and kiocb_set_rw_flags() are inline and modify kiocb->ki_flags. Place them close, so they can be potentially better optimised. Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2020-02-03io_uring: iterate req cache backwardsPavel Begunkov1-8/+4
Grab requests from cache-array from the end, so can get by only free_reqs. Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2020-02-03io_uring: punt even fadvise() WILLNEED to async contextJens Axboe1-3/+10
Andres correctly points out that read-ahead can block, if it needs to read in meta data (or even just through the page cache page allocations). Play it safe for now and just ensure WILLNEED is also punted to async context. While in there, allow the file settings hints from non-blocking context. They don't need to start/do IO, and we can safely do them inline. Fixes: 4840e418c2fc ("io_uring: add IORING_OP_FADVISE") Reported-by: Andres Freund <andres@anarazel.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2020-02-03io_uring: fix sporadic double CQE entry for closeJens Axboe1-5/+8
We punt close to async for the final fput(), but we log the completion even before that even in that case. We rely on the request not having a files table assigned to detect what the final async close should do. However, if we punt the async queue to __io_queue_sqe(), we'll get ->files assigned and this makes io_close_finish() think it should both close the filp again (which does no harm) AND log a new CQE event for this request. This causes duplicate CQEs. Queue the request up for async manually so we don't grab files needlessly and trigger this condition. Signed-off-by: Jens Axboe <axboe@kernel.dk>
2020-02-03io_uring: remove extra ->file checkPavel Begunkov1-3/+0
It won't ever get into io_prep_rw() when req->file haven't been set in io_req_set_file(), hence remove the check. Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2020-02-03io_uring: don't map read/write iovec potentially twiceJens Axboe1-3/+5
If we have a read/write that is deferred, we already setup the async IO context for that request, and mapped it. When we later try and execute the request and we get -EAGAIN, we don't want to attempt to re-map it. If we do, we end up with garbage in the iovec, which typically leads to an -EFAULT or -EINVAL completion. Cc: stable@vger.kernel.org # 5.5 Reported-by: Dan Melnic <dmm@fb.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2020-02-03io_uring: use the proper helpers for io_send/recvJens Axboe1-2/+4
Don't use the recvmsg/sendmsg helpers, use the same helpers that the recv(2) and send(2) system calls use. Reported-by: 李通洲 <carter.li@eoitek.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2020-02-03io_uring: prevent potential eventfd recursion on pollJens Axboe1-7/+30
If we have nested or circular eventfd wakeups, then we can deadlock if we run them inline from our poll waitqueue wakeup handler. It's also possible to have very long chains of notifications, to the extent where we could risk blowing the stack. Check the eventfd recursion count before calling eventfd_signal(). If it's non-zero, then punt the signaling to async context. This is always safe, as it takes us out-of-line in terms of stack and locking context. Cc: stable@vger.kernel.org # 5.1+ Signed-off-by: Jens Axboe <axboe@kernel.dk>
2020-02-03eventfd: track eventfd_signal() recursion depthJens Axboe1-0/+15
eventfd use cases from aio and io_uring can deadlock due to circular or resursive calling, when eventfd_signal() tries to grab the waitqueue lock. On top of that, it's also possible to construct notification chains that are deep enough that we could blow the stack. Add a percpu counter that tracks the percpu recursion depth, warn if we exceed it. The counter is also exposed so that users of eventfd_signal() can do the right thing if it's non-zero in the context where it is called. Cc: stable@vger.kernel.org # 4.19+ Signed-off-by: Jens Axboe <axboe@kernel.dk>
2020-02-03SMB3: Backup intent flag missing from some more opsAmir Goldstein14-118/+68
When "backup intent" is requested on the mount (e.g. backupuid or backupgid mount options), the corresponding flag was missing from some of the operations. Change all operations to use the macro cifs_create_options() to set the backup intent flag if needed. Signed-off-by: Amir Goldstein <amir73il@gmail.com> Signed-off-by: Steve French <stfrench@microsoft.com>
2020-02-03NFS: Switch readdir to using iterate_shared()Trond Myklebust1-1/+1
Now that the page cache locking is repaired, we should be able to switch to using iterate_shared() for improved concurrency when doing readdir(). Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com> Reviewed-by: Benjamin Coddington <bcodding@redhat.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2020-02-03NFS: Use kmemdup_nul() in nfs_readdir_make_qstr()Trond Myklebust1-1/+1
The directory strings stored in the readdir cache may be used with printk(), so it is better to ensure they are nul-terminated. Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com> Reviewed-by: Benjamin Coddington <bcodding@redhat.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2020-02-03NFS: Directory page cache pages need to be locked when readTrond Myklebust1-11/+19
When a NFS directory page cache page is removed from the page cache, its contents are freed through a call to nfs_readdir_clear_array(). To prevent the removal of the page cache entry until after we've finished reading it, we must take the page lock. Fixes: 11de3b11e08c ("NFS: Fix a memory leak in nfs_readdir") Cc: stable@vger.kernel.org # v2.6.37+ Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com> Reviewed-by: Benjamin Coddington <bcodding@redhat.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2020-02-03NFS: Fix memory leaks and corruption in readdirTrond Myklebust1-2/+15
nfs_readdir_xdr_to_array() must not exit without having initialised the array, so that the page cache deletion routines can safely call nfs_readdir_clear_array(). Furthermore, we should ensure that if we exit nfs_readdir_filler() with an error, we free up any page contents to prevent a leak if we try to fill the page again. Fixes: 11de3b11e08c ("NFS: Fix a memory leak in nfs_readdir") Cc: stable@vger.kernel.org # v2.6.37+ Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com> Reviewed-by: Benjamin Coddington <bcodding@redhat.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2020-02-03NFS: Replace various occurrences of kstrndup() with kmemdup_nul()Trond Myklebust2-2/+2
When we already know the string length, it is more efficient to use kmemdup_nul(). Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com> [Anna - Changes to super.c were already made during fscontext conversion] Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2020-02-03NFSv4: Limit the total number of cached delegationsTrond Myklebust1-1/+7
Delegations can be expensive to return, and can cause scalability issues for the server. Let's therefore try to limit the number of inactive delegations we hold. Once the number of delegations is above a certain threshold, start to return them on close. Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2020-02-03NFSv4: Add accounting for the number of active delegations heldTrond Myklebust1-12/+24
In order to better manage our delegation caching, add a counter to track the number of active delegations. Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
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