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* 9p: adjust 9p vfs write operationEric Van Hensbergen2008-10-17
| | | | | | | | | | | | | Currently, the 9p net wire operation ensures that all data is sent by sending multiple packets if the data requested is larger than the msize. This is better handled in the vfs code so that we can simplify wire operations to being concerned with only putting data onto and taking data off of the wire. Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
* 9p: move readn meta-function from client to fs layerEric Van Hensbergen2008-10-17
| | | | | | | | | | | | | | | There are a couple of methods in the client code which aren't actually wire operations. To keep things organized cleaner, these operations are being moved to the fs layer. This patch moves the readn meta-function (which executes multiple wire reads until a buffer is full) to the fs layer. Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
* 9p: consolidate read/write functionsEric Van Hensbergen2008-10-17
| | | | | | | | | | | | | | | Currently there are two separate versions of read and write. One for dealing with user buffers and the other for dealing with kernel buffers. There is a tremendous amount of code duplication in the otherwise identical versions of these functions. This patch adds an additional user buffer parameter to read and write and conditionalizes handling of the buffer on whether the kernel buffer or the user buffer is populated. Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
* 9p: consolidate transport structureEric Van Hensbergen2008-10-17
| | | | | | | | | | | | | Right now there is a transport module structure which provides per-transport type functions and data and a transport structure which contains per-instance public data as well as function pointers to instance specific functions. This patch moves public transport visible instance data to the client structure (which in some cases had duplicate data) and consolidates the functions into the transport module structure. Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
* Merge git://git.linux-nfs.org/projects/trondmy/nfs-2.6Linus Torvalds2008-10-16
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * git://git.linux-nfs.org/projects/trondmy/nfs-2.6: (53 commits) NFS: Fix a resolution problem with nfs_inode->cache_change_attribute NFS: Fix the resolution problem with nfs_inode_attrs_need_update() NFS: Changes to inode->i_nlinks must set the NFS_INO_INVALID_ATTR flag RPC/RDMA: ensure connection attempt is complete before signalling. RPC/RDMA: correct the reconnect timer backoff RPC/RDMA: optionally emit useful transport info upon connect/disconnect. RPC/RDMA: reformat a debug printk to keep lines together. RPC/RDMA: harden connection logic against missing/late rdma_cm upcalls. RPC/RDMA: fix connect/reconnect resource leak. RPC/RDMA: return a consistent error, when connect fails. RPC/RDMA: adhere to protocol for unpadded client trailing write chunks. RPC/RDMA: avoid an oops due to disconnect racing with async upcalls. RPC/RDMA: maintain the RPC task bytes-sent statistic. RPC/RDMA: suppress retransmit on RPC/RDMA clients. RPC/RDMA: fix connection IRD/ORD setting RPC/RDMA: support FRMR client memory registration. RPC/RDMA: check selected memory registration mode at runtime. RPC/RDMA: add data types and new FRMR memory registration enum. RPC/RDMA: refactor the inline memory registration code. NFS: fix nfs_parse_ip_address() corner case ...
| * Merge branch 'next'Trond Myklebust2008-10-15
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| | * NFS: Fix a resolution problem with nfs_inode->cache_change_attributeTrond Myklebust2008-10-14
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The cache_change_attribute is used to decide whether or not a directory has changed, in which case we may need to look it up again. Again, the use of 'jiffies' leads to an issue of resolution. Once again, the fix is to change nfs_inode->cache_change_attribute, and just make it a simple counter. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| | * NFS: Fix the resolution problem with nfs_inode_attrs_need_update()Trond Myklebust2008-10-14
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | It appears that 'jiffies' timestamps do not have high enough resolution for nfs_inode_attrs_need_update(). One problem is that a GETATTR can be launched within < 1 jiffy of the last operation that updated the attribute. Another problem is that RPC calls can take < 1 jiffy to execute. We can fix this by switching the variables to use a simple global counter that gets incremented every time we start another GETATTR call. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| | * NFS: Changes to inode->i_nlinks must set the NFS_INO_INVALID_ATTR flagTrond Myklebust2008-10-14
| | | | | | | | | | | | Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| | * NFS: fix nfs_parse_ip_address() corner caseChuck Lever2008-10-10
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Bruce observed that nfs_parse_ip_address() will successfully parse an IPv6 address that looks like this: "::1%" A scope delimiter is present, but there is no scope ID following it. This is harmless, as it would simply set the scope ID to zero. However, in some cases we would like to flag this as an improperly formed address. We are now also careful to reject addresses where garbage follows the address (up to the length of the string), instead of ignoring the non-address characters; and where the scope ID is nonsense (not a valid device name, but also not numeric). Before, both of these cases would result in a harmless zero scope ID. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| | * NFS: Cleanup nfs_set_portJ. Bruce Fields2008-10-10
| | | | | | | | | | | | | | | Signed-off-by: "J. Bruce Fields" <bfields@citi.umich.edu> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| | * NFS: Fix attribute updatesTrond Myklebust2008-10-09
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This fixes a regression seen when running the Connectathon testsuite against an ext3 filesystem. The reason was that the inode was constantly being marked as 'just updated' by the jiffy wraparound test. This again meant that newer GETATTR calls were failing to pass the nfs_inode_attrs_need_update() test unless the changes caused a ctime update on the server, since they were perceived as having been started before the latest inode update. Given that nfs_inode_attrs_need_update() already checks for wraparound of nfsi->last_updated, we can drop the buggy "protection" in nfs_update_inode(). Also make a slight micro-optimisation of nfs_inode_attrs_need_update(): we are more often going to see time_after(fattr->time_start, nfsi->last_updated) be true, rather than seeing an update of ctime/size, so put that test first to ensure that we optimise away the ctime/size tests. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| | * NFS: Don't use range_cyclic for data integrity syncsTrond Myklebust2008-10-07
| | | | | | | | | | | | | | | | | | | | | It is more efficient to write linearly starting from the beginning of the file. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| | * NFS: Client mounts hang when exported directory do not existSteve Dickson2008-10-07
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch fixes a regression that was introduced by the string based mounts. nfs_mount() statically returns -EACCES for every error returned by the remote mounted. This is incorrect because -EACCES is an non-fatal error to the mount.nfs command. This error causes mount.nfs to retry the mount even in the case when the exported directory does not exist. This patch maps the errors returned by the remote mountd into valid errno values, exactly how it was done pre-string based mounts. By returning the correct errno enables mount.nfs to do the right thing. Signed-off-by: Steve Dickson <steved@redhat.com> [Trond.Myklebust@netapp.com: nfs_stat_to_errno() now correctly returns negative errors, so remove the sign change.] Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| | * nfs: Fix misparsing of nfsv4 fs_locations attributeJ. Bruce Fields2008-10-07
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The code incorrectly assumes here that the server name (or ip address) is null-terminated. This can cause referrals to fail in some cases. Also support ipv6 addresses. Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| | * nfs: prepare to share nfs_set_portJ. Bruce Fields2008-10-07
| | | | | | | | | | | | | | | | | | | | | We plan to use this function elsewhere. Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| | * nfs: replace while loop by for loops in nfs_follow_referralJ. Bruce Fields2008-10-07
| | | | | | | | | | | | | | | | | | | | | Whoever wrote this had a bizarre allergy to for loops. Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| | * nfs: break up nfs_follow_referralJ. Bruce Fields2008-10-07
| | | | | | | | | | | | | | | | | | | | | This function is a little longer and more deeply nested than necessary. Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| | * nfs: authenticated deep mountingEG Keizer2008-10-07
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Allow mount to do authenticated mounts below the root of the exported tree. The wording in RFC 2623, sec 2.3.2. allows fsinfo with UNIX authentication on the root of the export. Mounts are not always done on the root of the exported tree. Especially autoumounts often mount below the root of the exported tree. Some server implementations (justly) require full authentication for the so-called deep mounts. The old code used AUTH_SYS only. This caused deep mounts to fail on systems requiring stronger authentication.. The client should try both authentication types and use the first one that succeeds. This method was already partially implemented. This patch completes the implementation for NFS2 and NFS3. This patch was developed to allow Debian systems to automount home directories on Solaris servers with krb5 authentication. Tested on kernel 2.6.24-etchnhalf.1 Signed-off-by: E.G. Keizer <keie@few.vu.nl> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| | * NFS: missing nfs_fattr_init in nfs3_proc_getacl and nfs3_proc_setacls ↵Jeff Layton2008-10-07
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | (resend #2) The fattrs used in the NFSv3 getacl/setacl calls are not being properly initialized. This occasionally causes nfs_update_inode to fall into NFSv4 specific codepaths when handling post-op attrs from these calls. Thanks to Cai Qian for noticing the spurious NFSv4 messages in debug output from a v3 mount... Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| | * nfs: remove an obsolete nfs_flock commentJ. Bruce Fields2008-10-07
| | | | | | | | | | | | | | | | | | | | | We *do* now allow bsd flocks over nfs. Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| | * nfs: BUG_ON in nfs_follow_mountpointDenis V. Lunev2008-10-07
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Unfortunately, BUG_ON(IS_ROOT(dentry)) can happen inside nfs_follow_mountpoint with NFS running Fedora 8 using a specific setup. https://bugzilla.redhat.com/show_bug.cgi?id=458622 So, the situation should be handled on NFS client gracefully. Signed-off-by: Denis V. Lunev <den@openvz.org> CC: Trond Myklebust <Trond.Myklebust@netapp.com> CC: J. Bruce Fields <bfields@fieldses.org> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| | * nfs: ERR_PTR is expected on failure from nfs_do_clone_mountDenis V. Lunev2008-10-07
| | | | | | | | | | | | | | | | | | | | | Replace NULL with ERR_PTR(-EINVAL). Signed-off-by: Denis V. Lunev <den@openvz.org> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| | * fix fs/nfs/nfsroot.c compilationAdrian Bunk2008-10-07
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch fixes the following compile error caused by commit f9247273cb69ba101877e946d2d83044409cc8c5 (UFS: add const to parser token tabl): <-- snip --> ... CC fs/nfs/nfsroot.o /home/bunk/linux/kernel-2.6/git/linux-2.6/fs/nfs/nfsroot.c:130: error: tokens causes a section type conflict make[3]: *** [fs/nfs/nfsroot.o] Error 1 <-- snip --> Signed-off-by: Adrian Bunk <bunk@kernel.org> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| | * NFS: Allow concurrent inode revalidationTrond Myklebust2008-10-07
| | | | | | | | | | | | | | | | | | | | | | | | | | | Currently, if two processes are both trying to revalidate metadata for the same inode, they will find themselves being serialised. There is no good justification for this now that we have improved our ability to detect stale attribute data, so we should remove that serialisation. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| | * NFS: Fix up nfs_setattr_update_inode()Trond Myklebust2008-10-07
| | | | | | | | | | | | | | | | | | Ensure that it sets the inode metadata under the correct spinlock. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| | * NFS: Don't clear nfsi->cache_validity in nfs_check_inode_attributes()Trond Myklebust2008-10-07
| | | | | | | | | | | | | | | | | | | | | | | | | | | If we're merely checking the inode attributes because we suspect that the 'updated' attributes returned by the RPC call are stale, then we shouldn't be doing weak cache consistency updates or clearing the cache_validity flags. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| | * NFS: Convert __nfs_revalidate_inode() to use nfs_refresh_inode()Trond Myklebust2008-10-07
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | In the case where there are parallel RPC calls to the same inode, we may receive stale metadata due to the lack of ordering, hence the sanity checking of metadata in nfs_refresh_inode(). Currently, __nfs_revalidate_inode() is calling nfs_update_inode() directly, without any further sanity checks, and hence may end up setting the inode up with stale metadata. Fix is to use nfs_refresh_inode() instead of nfs_update_inode(). Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| | * NFS: Fix nfs_post_op_update_inode_force_wcc()Trond Myklebust2008-10-07
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | If we believe that the attributes are old (see nfs_refresh_inode()), then we shouldn't force an update. Also ensure that we hold the inode->i_lock across attribute checks and the call to nfs_refresh_inode_locked() to ensure that we don't race with other attribute updates. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| | * NFS: Fix the NFS attribute updateTrond Myklebust2008-10-07
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Currently nfs_refresh_inode() will only update the inode metadata if it sees that the RPC call that returned the nfs_fattr was started after the last update of the inode. This means that if we have parallel RPC calls to the same inode (when sending WRITE calls, for instance), we may often miss updates. This patch attempts to recover those missed updates by also accepting them if the ctime in the nfs_fattr is more recent than the inode's cached ctime. It also recovers the case where the file size has increased, but the ctime has not been updated due to limited ctime resolution. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| | * NFS: Clean up nfs_refresh_inode() and nfs_post_op_update_inode()Trond Myklebust2008-10-07
| | | | | | | | | | | | | | | | | | | | | | | | | | | Try to avoid taking and dropping the inode->i_lock more than once. Do so by moving the code in nfs_refresh_inode() that needs to be done under the spinlock into a function nfs_refresh_inode_locked(), and then having both nfs_refresh_inode() and nfs_post_op_update_inode() call it directly. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| | * NFS: Add mount options for controlling the lookup cacheTrond Myklebust2008-10-07
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Add the following NFS-specific mount options to the parser. -o lookupcache=all /* Default: cache positive & negative dentries */ -o lookupcache=pos[itive] /* Don't cache negative dentries */ -o lookupcache=none /* Strict revalidation of all dentries */ Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| | * NFS: Don't apply NFS_MOUNT_FLAGMASK to text-based mountsTrond Myklebust2008-10-07
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The point of introducing text-based mounts was to allow us to add functionality without having to worry about legacy binary mount formats. The mask should be there in order to ensure that binary formats don't start enabling features that they cannot support. There is no justification for applying it to the text mount path. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| | * NFS: Add options for finer control of the lookup cacheTrond Myklebust2008-10-07
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Add the flag NFS_MOUNT_LOOKUP_CACHE_NONEG to turn off the caching of negative dentries. In reality what we do is to force nfs_lookup_revalidate() to always discard negative dentries. Add the flag NFS_MOUNT_LOOKUP_CACHE_NONE for enforcing stricter revalidation of dentries. It forces the revalidate code to always do a lookup instead of just checking the cached mtime of the parent directory. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| | * NFS: Clean up nfs_sb_active/nfs_sb_deactiveTrond Myklebust2008-10-06
| | | | | | | | | | | | | | | | | | | | | | | | | | | Instead of causing umount requests to block on server->active_wq while the asynchronous sillyrename deletes are executing, we can use the sb->s_active counter to obtain a reference to the super_block, and then release that reference in nfs_async_unlink_release(). Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| | * NFS: Fix nfs_file_llseek()Trond Myklebust2008-10-06
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | After the BKL removal patches were applied to the rest of the NFS code, the BKL protection in nfs_file_llseek() is no longer sufficient to ensure that inode->i_size is read safely in generic_file_llseek_unlocked(). In order to fix the situation, we either have to replace the naked read of inode->i_size in generic_file_llseek_unlocked() with i_size_read(), or the whole thing needs to be executed under the inode->i_lock; In order to avoid disrupting other filesystems, avoid touching generic_file_llseek_unlocked() for now... Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* | | Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core-2.6Linus Torvalds2008-10-16
|\ \ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core-2.6: (46 commits) UIO: Fix mapping of logical and virtual memory UIO: add automata sercos3 pci card support UIO: Change driver name of uio_pdrv UIO: Add alignment warnings for uio-mem Driver core: add bus_sort_breadthfirst() function NET: convert the phy_device file to use bus_find_device_by_name kobject: Cleanup kobject_rename and !CONFIG_SYSFS kobject: Fix kobject_rename and !CONFIG_SYSFS sysfs: Make dir and name args to sysfs_notify() const platform: add new device registration helper sysfs: use ilookup5() instead of ilookup5_nowait() PNP: create device attributes via default device attributes Driver core: make bus_find_device_by_name() more robust usb: turn dev_warn+WARN_ON combos into dev_WARN debug: use dev_WARN() rather than WARN_ON() in device_pm_add() debug: Introduce a dev_WARN() function sysfs: fix deadlock device model: Do a quickcheck for driver binding before doing an expensive check Driver core: Fix cleanup in device_create_vargs(). Driver core: Clarify device cleanup. ...
| * | | kobject: Cleanup kobject_rename and !CONFIG_SYSFSEric W. Biederman2008-10-16
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | It finally dawned on me what the clean fix to sysfs_rename_dir calling kobject_set_name is. Move the work into kobject_rename where it belongs. The callers serialize us anyway so this is safe. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Acked-by: Tejun Heo <tj@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| * | | sysfs: Make dir and name args to sysfs_notify() constTrent Piepho2008-10-16
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Because they can be, and because code like this produces a warning if they're not: struct device_attribute dev_attr; sysfs_notify(&kobj, NULL, dev_attr.attr.name); Signed-off-by: Trent Piepho <tpiepho@freescale.com> CC: Neil Brown <neilb@suse.de> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| * | | sysfs: use ilookup5() instead of ilookup5_nowait()Tejun Heo2008-10-16
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | As inode creation is protected by sysfs_mutex, ilookup5_nowait() always either fails to find at all or finds one which is fully initialized, so using ilookup5_nowait() or ilookup5() doesn't make any difference. Switch to ilookup5() as it's planned to be removed. This change also makes lookup return value handling a bit simpler. This change was suggested by Al Viro. Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Al Viro <viro@hera.kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| * | | sysfs: fix deadlockNick Piggin2008-10-16
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | On Thu, Sep 11, 2008 at 10:27:10AM +0200, Ingo Molnar wrote: > and it's working fine on most boxes. One testbox found this new locking > scenario: > > PM: Adding info for No Bus:vcsa7 > EDAC DEBUG: MC0: i82860_check() > > ======================================================= > [ INFO: possible circular locking dependency detected ] > 2.6.27-rc6-tip #1 > ------------------------------------------------------- > X/4873 is trying to acquire lock: > (&bb->mutex){--..}, at: [<c020ba20>] mmap+0x40/0xa0 > > but task is already holding lock: > (&mm->mmap_sem){----}, at: [<c0125a1e>] sys_mmap2+0x8e/0xc0 > > which lock already depends on the new lock. > > > the existing dependency chain (in reverse order) is: > > -> #1 (&mm->mmap_sem){----}: > [<c017dc96>] validate_chain+0xa96/0xf50 > [<c017ef2b>] __lock_acquire+0x2cb/0x5b0 > [<c017f299>] lock_acquire+0x89/0xc0 > [<c01aa8fb>] might_fault+0x6b/0x90 > [<c040b618>] copy_to_user+0x38/0x60 > [<c020bcfb>] read+0xfb/0x170 > [<c01c09a5>] vfs_read+0x95/0x110 > [<c01c1443>] sys_pread64+0x63/0x80 > [<c012146f>] sysenter_do_call+0x12/0x43 > [<ffffffff>] 0xffffffff > > -> #0 (&bb->mutex){--..}: > [<c017d8b7>] validate_chain+0x6b7/0xf50 > [<c017ef2b>] __lock_acquire+0x2cb/0x5b0 > [<c017f299>] lock_acquire+0x89/0xc0 > [<c0d6f2ab>] __mutex_lock_common+0xab/0x3c0 > [<c0d6f698>] mutex_lock_nested+0x38/0x50 > [<c020ba20>] mmap+0x40/0xa0 > [<c01b111e>] mmap_region+0x14e/0x450 > [<c01b170f>] do_mmap_pgoff+0x2ef/0x310 > [<c0125a3d>] sys_mmap2+0xad/0xc0 > [<c012146f>] sysenter_do_call+0x12/0x43 > [<ffffffff>] 0xffffffff > > other info that might help us debug this: > > 1 lock held by X/4873: > #0: (&mm->mmap_sem){----}, at: [<c0125a1e>] sys_mmap2+0x8e/0xc0 > > stack backtrace: > Pid: 4873, comm: X Not tainted 2.6.27-rc6-tip #1 > [<c017cd09>] print_circular_bug_tail+0x79/0xc0 > [<c017d8b7>] validate_chain+0x6b7/0xf50 > [<c017a5b5>] ? trace_hardirqs_off_caller+0x15/0xb0 > [<c017ef2b>] __lock_acquire+0x2cb/0x5b0 > [<c017f299>] lock_acquire+0x89/0xc0 > [<c020ba20>] ? mmap+0x40/0xa0 > [<c0d6f2ab>] __mutex_lock_common+0xab/0x3c0 > [<c020ba20>] ? mmap+0x40/0xa0 > [<c0d6f698>] mutex_lock_nested+0x38/0x50 > [<c020ba20>] ? mmap+0x40/0xa0 > [<c020ba20>] mmap+0x40/0xa0 > [<c01b111e>] mmap_region+0x14e/0x450 > [<c01afb88>] ? arch_get_unmapped_area_topdown+0xf8/0x160 > [<c01b170f>] do_mmap_pgoff+0x2ef/0x310 > [<c0125a3d>] sys_mmap2+0xad/0xc0 > [<c012146f>] sysenter_do_call+0x12/0x43 > [<c0120000>] ? __switch_to+0x130/0x220 > ======================= > evbug.c: Event. Dev: input3, Type: 20, Code: 0, Value: 500 > warning: `sudo' uses deprecated v2 capabilities in a way that may be insecure. > > i've attached the config. > > at first sight it looks like a genuine bug in fs/sysfs/bin.c? Yes, it is a real bug by the looks. bin.c takes bb->mutex under mmap_sem when it is mmapped, and then does its copy_*_user under bb->mutex too. Here is a basic fix for the sysfs lor. From: Nick Piggin <npiggin@suse.de> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| * | | sysfs: Support sysfs_notify from atomic context with new sysfs_notify_direntNeil Brown2008-10-16
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Support sysfs_notify from atomic context with new sysfs_notify_dirent sysfs_notify currently takes sysfs_mutex. This means that it cannot be called in atomic context. sysfs_mutex is sometimes held over a malloc (sysfs_rename_dir) so it can block on low memory. In md I want to be able to notify on a sysfs attribute from atomic context, and I don't want to block on low memory because I could be in the writeout path for freeing memory. So: - export the "sysfs_dirent" structure along with sysfs_get, sysfs_put and sysfs_get_dirent so I can get the sysfs_dirent that I want to notify on and hold it in an md structure. - split sysfs_notify_dirent out of sysfs_notify so the sysfs_dirent can be notified on with no blocking (just a spinlock). Signed-off-by: Neil Brown <neilb@suse.de> Acked-by: Tejun Heo <tj@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| * | | device create: misc: convert device_create_drvdata to device_createGreg Kroah-Hartman2008-10-16
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Now that device_create() has been audited, rename things back to the original call to be sane. Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| * | | sysfs: crash debuggingAndrew Morton2008-10-16
| |/ / | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Print the name of the last-accessed sysfs file when we oops, to help track down oopses which occur in sysfs store/read handlers. Because these oopses tend to not leave any trace of the offending code in the stack traces. Cc: Kay Sievers <kay.sievers@vrfy.org> Cc: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* | | Merge git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-for-linusLinus Torvalds2008-10-16
|\ \ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-for-linus: module: remove CONFIG_KMOD in comment after #endif remove CONFIG_KMOD from fs remove CONFIG_KMOD from drivers Manually fix conflict due to include cleanups in drivers/md/md.c
| * | | remove CONFIG_KMOD from fsJohannes Berg2008-10-16
| |/ / | | | | | | | | | | | | | | | | | | | | | | | | Just always compile the code when the kernel is modular. Convert load_nls to use try_then_request_module to tidy up the code. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
* | | Merge branch 'personality' of git://git390.osdl.marist.edu/pub/scm/linux-2.6Linus Torvalds2008-10-16
|\ \ \ | | | | | | | | | | | | | | | | * 'personality' of git://git390.osdl.marist.edu/pub/scm/linux-2.6: [PATCH] remove unused ibcs2/PER_SVR4 in SET_PERSONALITY
| * | | [PATCH] remove unused ibcs2/PER_SVR4 in SET_PERSONALITYMartin Schwidefsky2008-10-16
| |/ / | | | | | | | | | | | | | | | | | | | | | The SET_PERSONALITY macro is always called with a second argument of 0. Remove the ibcs argument and the various tests to set the PER_SVR4 personality. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* | | Configure out AIO supportThomas Petazzoni2008-10-16
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patchs adds the CONFIG_AIO option which allows to remove support for asynchronous I/O operations, that are not necessarly used by applications, particularly on embedded devices. As this is a size-reduction option, it depends on CONFIG_EMBEDDED. It allows to save ~7 kilobytes of kernel code/data: text data bss dec hex filename 1115067 119180 217088 1451335 162547 vmlinux 1108025 119048 217088 1444161 160941 vmlinux.new -7042 -132 0 -7174 -1C06 +/- This patch has been originally written by Matt Mackall <mpm@selenic.com>, and is part of the Linux Tiny project. [randy.dunlap@oracle.com: build fix] Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Cc: Benjamin LaHaise <bcrl@kvack.org> Cc: Zach Brown <zach.brown@oracle.com> Signed-off-by: Matt Mackall <mpm@selenic.com> Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* | | afs: convert to new aopsNick Piggin2008-10-16
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Cannot assume writes will fully complete, so this conversion goes the easy way and always brings the page uptodate before the write. [dhowells@redhat.com: style tweaks] Signed-off-by: Nick Piggin <npiggin@suse.de> Acked-by: David Howells <dhowells@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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