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2014-08-07netlink: reset network header before passing to tapsDaniel Borkmann
netlink doesn't set any network header offset thus when the skb is being passed to tap devices via dev_queue_xmit_nit(), it emits klog false positives due to it being unset like: ... [ 124.990397] protocol 0000 is buggy, dev nlmon0 [ 124.990411] protocol 0000 is buggy, dev nlmon0 ... So just reset the network header before passing to the device; for packet sockets that just means nothing will change - mac and net offset hold the same value just as before. Reported-by: Marcel Holtmann <marcel@holtmann.org> Signed-off-by: Daniel Borkmann <dborkman@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2014-08-07net: gianfar: fix reference counting for phy_nodeUwe Kleine-König
The line before the changed if condition is: priv->phy_node = of_parse_phandle(np, "phy-handle", 0); . If this call succeeds priv->phy_node must not be overwritten in the if block; otherwise the reference to the node returned by of_parse_phandle is lost. So add a check that the if block isn't executed in this case. Furthermore in the fixed phy case no reference is aquired for phy_node resulting in an of_node_put without holding a reference. To fix that, get a reference on the MAC dt node. Fixes: be40364544bd ("gianfar: use the new fixed PHY helpers") Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by: David S. Miller <davem@davemloft.net>
2014-08-07net: mvneta: Fix reference counting for phy_nodeUwe Kleine-König
If there is a "phy" handle the probe function returns with holding a reference to that node. Make sure that in the fixed phy case there is also held a reference to yield a consistant state. Also add the corresponding of_node_put in the error path and the remove function. Fixes: 83895bedeee6 ("net: mvneta: add support for fixed links") Fixes: c5aff18204da ("net: mvneta: driver for Marvell Armada 370/XP network unit") Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by: David S. Miller <davem@davemloft.net>
2014-08-07net: gianfar: no need to check parameter being != NULL for of_node_putUwe Kleine-König
of_node_put is a noop when being called with NULL. Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by: David S. Miller <davem@davemloft.net>
2014-08-07drivers/atm/atmtcp.c: fix error return codeJulia Lawall
Convert a zero return value on error to a negative one, as returned elsewhere in the function. A simplified version of the semantic match that finds this problem is as follows: (http://coccinelle.lip6.fr/) // <smpl> @@ identifier ret; expression e1,e2; @@ ( if (\(ret < 0\|ret != 0\)) { ... return ret; } | ret = 0 ) ... when != ret = e1 when != &ret *if(...) { ... when != ret = e2 when forall return ret; } // </smpl> Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr> Acked-by: Chas Williams <chas@cmf.nrl.navy.mil> Signed-off-by: David S. Miller <davem@davemloft.net>
2014-08-07batman: fix duplicate #include of multicast.hJean Sacren
The header multicast.h was included twice, so delete one of them. Signed-off-by: Jean Sacren <sakiwit@gmail.com> Cc: Marek Lindner <mareklindner@neomailbox.ch> Cc: Simon Wunderlich <sw@simonwunderlich.de> Cc: Antonio Quartulli <antonio@meshcoding.com> Cc: b.a.t.m.a.n@lists.open-mesh.org Signed-off-by: David S. Miller <davem@davemloft.net>
2014-08-07openvswitch: fix duplicate #include headersJean Sacren
The #include headers net/genetlink.h and linux/genetlink.h both were included twice, so delete each of the duplicate. Signed-off-by: Jean Sacren <sakiwit@gmail.com> Cc: Pravin Shelar <pshelar@nicira.com> Cc: dev@openvswitch.org Signed-off-by: David S. Miller <davem@davemloft.net>
2014-08-07amd: xgbe: fix duplicate #include of linux/phy.hJean Sacren
The header linux/phy.h was included twice, so delete one of them. Signed-off-by: Jean Sacren <sakiwit@gmail.com> Cc: Tom Lendacky <thomas.lendacky@amd.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2014-08-07solos-pci: fix error return codeJulia Lawall
Convert a zero return value on error to a negative one, as returned elsewhere in the function. A simplified version of the semantic match that finds this problem is as follows: (http://coccinelle.lip6.fr/) // <smpl> @@ identifier ret; expression e1,e2; @@ ( if (\(ret < 0\|ret != 0\)) { ... return ret; } | ret = 0 ) ... when != ret = e1 when != &ret *if(...) { ... when != ret = e2 when forall return ret; } // </smpl> Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr> Acked-by: Chas Williams <chas@cmf.nrl.navy.mil> Signed-off-by: David S. Miller <davem@davemloft.net>
2014-08-07xen-netback: Fix vif->disable handlingZoltan Kiss
In the patch called "xen-netback: Turn off the carrier if the guest is not able to receive" new branches were introduced to this if statement, risking that a queue with non-zero id can reenable the disabled interface. Signed-off-by: Zoltan Kiss <zoltan.kiss@citrix.com> Signed-off-by: David Vrabel <david.vrabel@citrix.com> Cc: netdev@vger.kernel.org Cc: linux-kernel@vger.kernel.org Cc: xen-devel@lists.xenproject.org Signed-off-by: David S. Miller <davem@davemloft.net>
2014-08-07cxgb4: Update FW version string to match FW binary versionHariprasad Shenai
Signed-off-by: Hariprasad Shenai <hariprasad@chelsio.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2014-08-07Merge branch 'next/fixes-non-critical' into next/cleanupOlof Johansson
Merging in the few fixes we had also received, no need to keep those in a separate branch. * next/fixes-non-critical: drivers: CCI: Correct use of ! and & MAINTAINERS: Add sdhci-st file to ARCH/STI architecture ARM: EXYNOS: Fix build breakge with PM_SLEEP=n ARM: omap2+: gpmc-nand: Use dynamic platform_device_alloc() omap16xx: Removes fixme no longer needed in ocpi_enable() ARM: dts: OMAP5: Add device nodes for ABB ARM: omap2+: usb-tusb6010.c: Cleaning up variable is set more than once Signed-off-by: Olof Johansson <olof@lixom.net>
2014-08-08Revert "drm: drop redundant drm_file->is_master"Dave Airlie
This reverts commit 48ba813701eb14b3008edefef4a0789b328e278c. Thanks to Chris: "drm_file->is_master is not synomous with having drm_file->master == drm_file->minor->master. This is because drm_file->master is the same for all drm_files of the same generation and so when there is a master, every drm_file believes itself to be the master. Confusion ensues and things go pear shaped when one file is closed and there is no master anymore." Conflicts: drivers/gpu/drm/drm_drv.c drivers/gpu/drm/drm_stub.c
2014-08-07kbuild: kselftest - new make target to build and run kernel selftestsShuah Khan
Add a new make target "kselftest" to enable kernel testing. This new target builds and runs kernel selftests. Running as root is recommended for a complete test run as some tests don't run when run by non-root user. Build, install, and boot kernel before running kselftest on it. Signed-off-by: Shuah Khan <shuah.kh@samsung.com> Acked-by: Sam Ravnborg <sam@ravnborg.org> Signed-off-by: Michal Marek <mmarek@suse.cz>
2014-08-07kbuild: Fix handling of backslashes in *.cmd filesMichal Marek
Commit c353acba ("kbuild: make: fix if_changed when command contains backslashes") attempted to handle backslashes in *.cmd files, but it only handled double backslashes for some reason. Changing make-cmd to also handle single backslashes fixes rebuilds with dash, but it breaks bash again. The reason is that the two shells disagree about the interpretation of backslash sequences in the echo builtin. The way out of this is to print the command with printf '%s\n'. While at it, document what the individual parts of make-cmd do and why. Reported-and-tested-by: Konstantin Khlebnikov <koct9i@gmail.com> Reviewed-by: Sam Ravnborg <sam@ravnborg.org> Signed-off-by: Michal Marek <mmarek@suse.cz>
2014-08-07cpufreq: speedstep-smi: fix decimal printf specifiersHans Wennborg
The prefix suggests the number should be printed in hex, so use the %x specifier to do that. Also, these are 32-bit values, so drop the l characters. Signed-off-by: Hans Wennborg <hans@hanshq.net> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2014-08-07ACPI / hotplug: Check scan handlers in acpi_scan_hot_remove()Tang Chen
When ACPI_HOTPLUG_MEMORY is not configured, memory_device_handler.attach is not set. In acpi_scan_attach_handler(), the acpi_device->handler will not be initialized. In acpi_scan_hot_remove(), it doesn't check if acpi_device->handler is NULL. If we do memory hot-remove without ACPI_HOTPLUG_MEMORY configured, the kernel will panic. BUG: unable to handle kernel NULL pointer dereference at 0000000000000088 IP: [<ffffffff813e318f>] acpi_device_hotplug+0x1d7/0x4c4 PGD 0 Oops: 0000 [#1] SMP Modules linked in: sd_mod(E) sr_mod(E) cdrom(E) crc_t10dif(E) crct10dif_common(E) ata_piix(E) libata(E) CPU: 0 PID: 41 Comm: kworker/u2:1 Tainted: G E 3.16.0-rc7--3.16-rc7-tangchen+ #20 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.7.5-0-ge51488c-20140602_164612-nilsson.home.kraxel.org 04/01/2014 Workqueue: kacpi_hotplug acpi_hotplug_work_fn task: ffff8800182436c0 ti: ffff880018254000 task.ti: ffff880018254000 RIP: 0010:[<ffffffff813e318f>] [<ffffffff813e318f>] acpi_device_hotplug+0x1d7/0x4c4 RSP: 0000:ffff880018257da8 EFLAGS: 00000246 RAX: 0000000000000000 RBX: ffff88001cd8d800 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffff88001e40e6f8 RDI: 0000000000000246 RBP: ffff880018257df0 R08: 0000000000000096 R09: 00000000000011a0 R10: 63735f6970636120 R11: 725f746f685f6e61 R12: 0000000000000003 R13: ffff88001cc1c400 R14: ffff88001e062028 R15: 0000000000000040 FS: 0000000000000000(0000) GS:ffff88001e400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b CR2: 0000000000000088 CR3: 000000001a9a2000 CR4: 00000000000006f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 0000000000000000 DR7: 0000000000000000 Stack: 00000000523cab58 ffff88001cd8d9f8 ffff88001852d480 00000000523cab58 ffff88001852d480 ffff880018221e40 ffff88001cc1c400 ffff88001cce2d00 0000000000000040 ffff880018257e08 ffffffff813dc31d ffff88001852d480 Call Trace: [<ffffffff813dc31d>] acpi_hotplug_work_fn+0x1e/0x29 [<ffffffff8108eefb>] process_one_work+0x17b/0x460 [<ffffffff8108f69d>] worker_thread+0x11d/0x5b0 [<ffffffff8108f580>] ? rescuer_thread+0x3a0/0x3a0 [<ffffffff81096811>] kthread+0xe1/0x100 [<ffffffff81096730>] ? kthread_create_on_node+0x1a0/0x1a0 [<ffffffff816cc6bc>] ret_from_fork+0x7c/0xb0 [<ffffffff81096730>] ? kthread_create_on_node+0x1a0/0x1a0 This patch fixes this problem by checking if acpi_device->handler is NULL in acpi_scan_hot_remove(). Fixes: d22ddcbc4fb7 (ACPI / hotplug: Add demand_offline hotplug profile flag) Signed-off-by: Tang Chen <tangchen@cn.fujitsu.com> Cc: 3.14+ <stable@vger.kernel.org> # 3.14+ [rjw: Subject] Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2014-08-076lowpan: Allow 6LoWPAN to be modularGeert Uytterhoeven
Change config symbol 6LOWPAN from type bool to type tristate, so 6LoWPAN can be built modular, just like IPV6 Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org> Acked-by: Marcel Holtmann <marcel@holtmann.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2014-08-07switch iov_iter_get_pages() to passing maximal number of pagesAl Viro
... instead of maximal size. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2014-08-07fs: mark __d_obtain_alias staticFengguang Wu
Signed-off-by: Fengguang Wu <fengguang.wu@intel.com> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2014-08-07dcache: d_splice_alias should detect loopsJ. Bruce Fields
I believe this can only happen in the case of a corrupted filesystem. So -EIO looks like the appropriate error. Signed-off-by: J. Bruce Fields <bfields@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2014-08-07exportfs: update Exporting documentationJ. Bruce Fields
Minor documentation updates: - refer to d_obtain_alias rather than d_alloc_anon - explain when to use d_splice_alias and when d_materialise_unique. - cut some details of d_splice_alias/d_materialise_unique implementation. Signed-off-by: J. Bruce Fields <bfields@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2014-08-07dcache: d_find_alias needn't recheck IS_ROOT && DCACHE_DISCONNECTEDJ. Bruce Fields
If we get to this point and discover the dentry is not a root dentry, or not DCACHE_DISCONNECTED--great, we always prefer that anyway. Signed-off-by: J. Bruce Fields <bfields@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2014-08-07dcache: remove unused d_find_alias parameterJ. Bruce Fields
Signed-off-by: J. Bruce Fields <bfields@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2014-08-07dcache: d_obtain_alias callers don't all want DISCONNECTEDJ. Bruce Fields
There are a few d_obtain_alias callers that are using it to get the root of a filesystem which may already have an alias somewhere else. This is not the same as the filehandle-lookup case, and none of them actually need DCACHE_DISCONNECTED set. It isn't really a serious problem, but it would really be clearer if we reserved DCACHE_DISCONNECTED for those cases where it's actually needed. In the btrfs case this was causing a spurious printk from nfsd/nfsfh.c:fh_verify when it found an unexpected DCACHE_DISCONNECTED dentry. Josef worked around this by unsetting DCACHE_DISCONNECTED manually in 3a0dfa6a12e "Btrfs: unset DCACHE_DISCONNECTED when mounting default subvol", and this replaces that workaround. Cc: Josef Bacik <jbacik@fb.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2014-08-07dcache: d_splice_alias should ignore DCACHE_DISCONNECTEDJ. Bruce Fields
Any IS_ROOT() alias should be safe to use; there's nothing special about DCACHE_DISCONNECTED dentries. Note that this is in fact useful for filesystems such as btrfs which can legimately encounter a directory with a preexisting IS_ROOT alias on a lookup that crosses into a subvolume. (Those aliases are currently marked DCACHE_DISCONNECTED--but not really for any good reason, and we'll change that soon.) Signed-off-by: J. Bruce Fields <bfields@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2014-08-07dcache: d_splice_alias mustn't create directory aliasesJ. Bruce Fields
Currently if d_splice_alias finds a directory with an alias that is not IS_ROOT or not DCACHE_DISCONNECTED, it creates a duplicate directory. Duplicate directory dentries are unacceptable; it is better just to error out. (In the case of a local filesystem the most likely case is filesystem corruption: for example, perhaps two directories point to the same child directory, and the other parent has already been found and cached.) Note that distributed filesystems may encounter this case in normal operation if a remote host moves a directory to a location different from the one we last cached in the dcache. For that reason, such filesystems should instead use d_materialise_unique, which tries to move the old directory alias to the right place instead of erroring out. Signed-off-by: J. Bruce Fields <bfields@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2014-08-07dcache: close d_move race in d_splice_aliasJ. Bruce Fields
d_splice_alias will d_move an IS_ROOT() directory dentry into place if one exists. This should be safe as long as the dentry remains IS_ROOT, but I can't see what guarantees that: once we drop the i_lock all we hold here is the i_mutex on an unrelated parent directory. Instead copy the logic of d_materialise_unique. Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: J. Bruce Fields <bfields@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2014-08-07dcache: move d_splice_aliasJ. Bruce Fields
Just a trivial move to locate it near (similar) d_materialise_unique code and save some forward references in a following patch. Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: J. Bruce Fields <bfields@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2014-08-07namei: trivial fix to vfs_rename_dir commentJ. Bruce Fields
Looks like the directory loop check is actually done in renameat? Whatever, leave this out rather than trying to keep it up to date with the code. Signed-off-by: J. Bruce Fields <bfields@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2014-08-07VFS: allow ->d_manage() to declare -EISDIR in rcu_walk mode.NeilBrown
In REF-walk mode, ->d_manage can return -EISDIR to indicate that the dentry is not really a mount trap (or even a mount point) and that any mounts or any DCACHE_NEED_AUTOMOUNT flag should be ignored. RCU-walk mode doesn't currently support this, so if there is a dentry with DCACHE_NEED_AUTOMOUNT set but which shouldn't be a mount-trap, lookup_fast() will always drop in REF-walk mode. With this patch, an -EISDIR from ->d_manage will always cause mounts and automounts to be ignored, both in REF-walk and RCU-walk. Bug-fixed-by: Dan Carpenter <dan.carpenter@oracle.com> Cc: Ian Kent <raven@themaw.net> Signed-off-by: NeilBrown <neilb@suse.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2014-08-07cifs: support RENAME_NOREPLACEMiklos Szeredi
This flag gives CIFS the ability to support its native rename semantics. Implementation is simple: just bail out before trying to hack around the noreplace semantics. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Cc: Steve French <smfrench@gmail.com> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2014-08-07hostfs: support rename flagsMiklos Szeredi
Support RENAME_NOREPLACE and RENAME_EXCHANGE flags on hostfs if the underlying filesystem supports it. Since renameat2(2) is not yet in any libc, use syscall(2) to invoke the renameat2 syscall. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Cc: Richard Weinberger <richard@nod.at> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2014-08-07shmem: support RENAME_EXCHANGEMiklos Szeredi
This is really simple in tmpfs since the VFS already takes care of shuffling the dentries. Just adjust nlink on parent directories and touch c & mtimes. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Acked-by: Hugh Dickins <hughd@google.com> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2014-08-07shmem: support RENAME_NOREPLACEMiklos Szeredi
Implement ->rename2 instead of ->rename. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Acked-by: Hugh Dickins <hughd@google.com> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2014-08-07btrfs: add RENAME_NOREPLACEMiklos Szeredi
RENAME_NOREPLACE is trivial to implement for most filesystems: switch over to ->rename2() and check for the supported flags. The rest is done by the VFS. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Cc: Chris Mason <clm@fb.com> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2014-08-07bad_inode: add ->rename2()Miklos Szeredi
so we return -EIO instead of -EINVAL. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2014-08-07fs: call rename2 if existsMiklos Szeredi
Christoph Hellwig suggests: 1) make vfs_rename call ->rename2 if it exists instead of ->rename 2) switch all filesystems that you're adding NOREPLACE support for to use ->rename2 3) see how many ->rename instances we'll have left after a few iterations of 2. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2014-08-07kernel/acct.c: fix coding style warnings and errorsIonut Alexa
Signed-off-by: Ionut Alexa <ionut.m.alexa@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2014-08-07death to mnt_pinnedAl Viro
Rather than playing silly buggers with vfsmount refcounts, just have acct_on() ask fs/namespace.c for internal clone of file->f_path.mnt and replace it with said clone. Then attach the pin to original vfsmount. Voila - the clone will be alive until the file gets closed, making sure that underlying superblock remains active, etc., and we can drop the original vfsmount, so that it's not kept busy. If the file lives until the final mntput of the original vfsmount, we'll notice that there's an fs_pin (one in bsd_acct_struct that holds that file) and mnt_pin_kill() will take it out. Since ->kill() is synchronous, we won't proceed past that point until these files are closed (and private clones of our vfsmount are gone), so we get the same ordering warranties we used to get. mnt_pin()/mnt_unpin()/->mnt_pinned is gone now, and good riddance - it never became usable outside of kernel/acct.c (and racy wrt umount even there). Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2014-08-07make fs/{namespace,super}.c forget about acct.hAl Viro
These externs belong in fs/internal.h. Rename (they are not acct-specific anymore) and move them over there. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2014-08-07take fs_pin stuff to fs/*Al Viro
Add a new field to fs_pin - kill(pin). That's what umount and r/o remount will be calling for all pins attached to vfsmount and superblock resp. Called after bumping the refcount, so it won't go away under us. Dropping the refcount is responsibility of the instance. All generic stuff moved to fs/fs_pin.c; the next step will rip all the knowledge of kernel/acct.c from fs/super.c and fs/namespace.c. After that - death to mnt_pin(); it was intended to be usable as generic mechanism for code that wants to attach objects to vfsmount, so that they would not make the sucker busy and would get killed on umount. Never got it right; it remained acct.c-specific all along. Now it's very close to being killable. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2014-08-07start carving bsd_acct_struct upAl Viro
pull generic parts into struct fs_pin. Eventually we want those to replace mnt_pin()/mnt_unpin() mess; that stuff will move to fs/*. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2014-08-07acct: move mnt_pin() upwards.Al Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2014-08-07make acct_kill() wait for file closing.Al Viro
Do actual closing of file via schedule_work(). And use __fput_sync() there. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2014-08-07drop ->s_umount around acct_auto_close()Al Viro
just repeat the frozen check after regaining it, and check that sb is still alive. If several threads hit acct_auto_close() at the same time, acct_auto_close() will survive that just fine. And we really don't want to play with writes and closing the file with ->s_umount held exclusive - it's a deadlock country. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2014-08-07acct: get rid of acct_lock for acct->countAl Viro
* make acct->count atomic and acct freeing - rcu-delayed. * instead of grabbing acct_lock around the places where we take a reference, do that under rcu_read_lock() with atomic_long_inc_not_zero(). * have the new acct locked before making ns->bacct point to it Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2014-08-07acct: get rid of acct_listAl Viro
Put these suckers on per-vfsmount and per-superblock lists instead. Note: right now it's still acct_lock for everything, but that's going to change. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2014-08-07acct: simplify check_free_space()Al Viro
a) file can't be NULL b) file can't be changed under us c) all writes are serialized by acct->lock; no need to mess with spinlock there. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2014-08-07acct: new lifetime rulesAl Viro
Do not reuse bsd_acct_struct after closing the damn thing. Structure lifetime is controlled by refcount now. We also have a mutex in there, held over closing and writing (the file is O_APPEND, so we are not losing any concurrency). As the result, we do not need to bother with get_file()/fput() on log write anymore. Moreover, do_acct_process() only needs acct itself; file and pidns are picked from it. Killed instances are distinguished by having NULL ->ns. Refcount is protected by acct_lock; anybody taking the mutex needs to grab a reference first. The things will get a lot simpler in the next commits - this is just the minimal chunk switching to the new lifetime rules. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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