summaryrefslogtreecommitdiff
AgeCommit message (Collapse)Author
2013-11-09RCU'd vfsmountsAl Viro
* RCU-delayed freeing of vfsmounts * vfsmount_lock replaced with a seqlock (mount_lock) * sequence number from mount_lock is stored in nameidata->m_seq and used when we exit RCU mode * new vfsmount flag - MNT_SYNC_UMOUNT. Set by umount_tree() when its caller knows that vfsmount will have no surviving references. * synchronize_rcu() done between unlocking namespace_sem in namespace_unlock() and doing pending mntput(). * new helper: legitimize_mnt(mnt, seq). Checks the mount_lock sequence number against seq, then grabs reference to mnt. Then it rechecks mount_lock again to close the race and either returns success or drops the reference it has acquired. The subtle point is that in case of MNT_SYNC_UMOUNT we can simply decrement the refcount and sod off - aforementioned synchronize_rcu() makes sure that final mntput() won't come until we leave RCU mode. We need that, since we don't want to end up with some lazy pathwalk racing with umount() and stealing the final mntput() from it - caller of umount() may expect it to return only once the fs is shut down and we don't want to break that. In other cases (i.e. with MNT_SYNC_UMOUNT absent) we have to do full-blown mntput() in case of mount_lock sequence number mismatch happening just as we'd grabbed the reference, but in those cases we won't be stealing the final mntput() from anything that would care. * mntput_no_expire() doesn't lock anything on the fast path now. Incidentally, SMP and UP cases are handled the same way - no ifdefs there. * normal pathname resolution does *not* do any writes to mount_lock. It does, of course, bump the refcounts of vfsmount and dentry in the very end, but that's it. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-11-09switch shrink_dcache_for_umount() to use of d_walk()Al Viro
we have too many iterators in fs/dcache.c... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-24fuse: rcu-delay freeing fuse_connAl Viro
makes ->permission() and ->d_revalidate() safety in RCU mode independent from vfsmount_lock. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-24pid_namespace: make freeing struct pid_namespace rcu-delayedAl Viro
makes procfs ->premission() instances safety in RCU mode independent from vfsmount_lock. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-24ncpfs: rcu-delay unload_nls() and freeing ncp_serverAl Viro
makes ->d_hash() and ->d_compare() safety in RCU mode independent from vfsmount_lock. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-24fat: rcu-delay unloading nls and freeing sbiAl Viro
makes ->d_hash() and ->d_compare() safety in RCU mode independent from vfsmount_lock. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-24cifs: rcu-delay unload_nls() and freeing sbiAl Viro
makes ->d_hash(), ->d_compare() and ->permission() safety in RCU mode independent from vfsmount_lock. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-24autofs4: make freeing sbi rcu-delayedAl Viro
makes ->d_managed() safety in RCU mode independent from vfsmount_lock Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-24adfs: delayed freeing of sbiAl Viro
makes ->d_hash() and ->d_compare() safety in RCU mode independent from vfsmount_lock. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-24hpfs: make freeing sbi and codetables rcu-delayedAl Viro
makes ->d_hash() and ->d_compare() safety in RCU mode independent from vfsmount_lock Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-24make freeing super_block rcu-delayedAl Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-24vfs: introduce d_instantiate_no_diralias()Miklos Szeredi
...which just returns -EBUSY if a directory alias would be created. This is to be used by fuse mkdir to make sure that a buggy or malicious userspace filesystem doesn't do anything nasty. Previously fuse used a private mutex for this purpose, which can now go away. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
2013-10-24move taking vfsmount_lock down into prepend_path()Al Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-24split __lookup_mnt() in two functionsAl Viro
Instead of passing the direction as argument (and checking it on every step through the hash chain), just have separate __lookup_mnt() and __lookup_mnt_last(). And use the standard iterators... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-24uninline destroy_super(), consolidate alloc_super()Al Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-24isofs: don't pass dentry to isofs_hash{i,}_common()Al Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-24new helpers: lock_mount_hash/unlock_mount_hashAl Viro
aka br_write_{lock,unlock} of vfsmount_lock. Inlines in fs/mount.h, vfsmount_lock extern moved over there as well. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-24don't bother with vfsmount_lock in mounts_poll()Al Viro
wake_up_interruptible/poll_wait provide sufficient barriers; just use ACCESS_ONCE() to fetch ns->event and that's it. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-24namespace.c: get rid of mnt_ghostsAl Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-24fold dup_mnt_ns() into its only surviving callerAl Viro
should've been done 6 years ago... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-24mnt_set_expiry() doesn't need vfsmount_lockAl Viro
->mnt_expire is protected by namespace_sem Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-24finish_automount() doesn't need vfsmount_lock for removal from expiry listAl Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-24fs/namespace.c: bury long-dead defineAl Viro
MNT_WRITER_UNDERFLOW_LIMIT has been missed 4 years ago when it became unused. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-24fold mntfree() into mntput_no_expire()Al Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-24do_remount(): pull touch_mnt_namespace() upAl Viro
... and don't bother with dropping and regaining vfsmount_lock Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-24dup_mnt_ns(): get rid of pointless grabbing of vfsmount_lockAl Viro
mnt_list is protected by namespace_sem, not vfsmount_lock Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-24fs_is_visible only needs namespace_sem held sharedAl Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-24initialize namespace_sem staticallyAl Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-24file->f_op is never NULL...Al Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-24rtl8188eu: remove dead codeAl Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-24dmxdev: get rid of pointless clearing ->f_opAl Viro
nobody else will see that struct file after return from ->release() anyway; just leave ->f_op as is and let __fput() do that fops_put(). Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-24consolidate the reassignments of ->f_op in ->open() instancesAl Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-24put_mnt_ns(): use drop_collected_mounts()Al Viro
... rather than open-coding it Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-24ncpfs: switch to %p[dD]Al Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-24ubifs: switch to %pdAl Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-24sunrpc: switch to %pdAl Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-24nfsd: switch to %p[dD]Al Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-24nfs: use %p[dD] instead of open-coded (and often racy) equivalentsAl Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-24befs: split symlink iops in two - for short and long symlinks resp.Al Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-24new helper: kfree_put_link()Al Viro
duplicated to hell and back... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-24libfs: get exports to definitions of objects being exported...Al Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-24ecryptfs: ->lower_path.dentry is never NULLAl Viro
... on anything found via ->d_fsdata Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-24ecryptfs: get rid of ecryptfs_set_dentry_lower{,_mnt}Al Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-24ecryptfs: don't leave RCU pathwalk immediatelyAl Viro
If the underlying dentry doesn't have ->d_revalidate(), there's no need to force dropping out of RCU mode. All we need for that is to make freeing ecryptfs_dentry_info RCU-delayed. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-24ecryptfs: check DCACHE_OP_REVALIDATE instead of ->d_opAl Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-249p: make v9fs_cache_inode_{get,put,set}_cookie empty inlines for !9P_CACHEFSAl Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-06Linux 3.12-rc4v3.12-rc4Linus Torvalds
2013-10-06net: Update the sysctl permissions handler to test effective uid/gidEric W. Biederman
Modify the code to use current_euid(), and in_egroup_p, as in done in fs/proc/proc_sysctl.c:test_perm() Cc: stable@vger.kernel.org Reviewed-by: Eric Sandeen <sandeen@redhat.com> Reported-by: Eric Sandeen <sandeen@redhat.com> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-10-06Merge git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pendingLinus Torvalds
Pull SCSI target fixes from Nicholas Bellinger: "Here are the outstanding target fixes queued up for v3.12-rc4 code. The highlights include: - Make vhost/scsi tag percpu_ida_alloc() use GFP_ATOMIC - Allow sess_cmd_map allocation failure fallback to use vzalloc - Fix COMPARE_AND_WRITE se_cmd->data_length bug with FILEIO backends - Fixes for COMPARE_AND_WRITE callback recursive failure OOPs + non zero scsi_status bug - Make iscsi-target do acknowledgement tag release from RX context - Setup iscsi-target with extra (cmdsn_depth / 2) percpu_ida tags Also included is a iscsi-target patch CC'ed for v3.10+ that avoids legacy wait_for_task=true release during fast-past StatSN acknowledgement, and two other SRP target related patches that address long-standing issues that are CC'ed for v3.3+. Extra thanks to Thomas Glanzmann for his testing feedback with COMPARE_AND_WRITE + EXTENDED_COPY VAAI logic" * git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending: iscsi-target; Allow an extra tag_num / 2 number of percpu_ida tags iscsi-target: Perform release of acknowledged tags from RX context iscsi-target: Only perform wait_for_tasks when performing shutdown target: Fail on non zero scsi_status in compare_and_write_callback target: Fix recursive COMPARE_AND_WRITE callback failure target: Reset data_length for COMPARE_AND_WRITE to NoLB * block_size ib_srpt: always set response for task management target: Fall back to vzalloc upon ->sess_cmd_map kzalloc failure vhost/scsi: Use GFP_ATOMIC with percpu_ida_alloc for obtaining tag ib_srpt: Destroy cm_id before destroying QP. target: Fix xop->dbl assignment in target_xcopy_parse_segdesc_02
2013-10-06Merge branch 'fixes' of git://git.infradead.org/users/vkoul/slave-dmaLinus Torvalds
Pull slave-dmaengine fixes from Vinod Koul: "Here is the slave dmanegine fixes. We have the fix for deadlock issue on imx-dma by Michael and Josh's edma config fix along with author change" * 'fixes' of git://git.infradead.org/users/vkoul/slave-dma: dmaengine: imx-dma: fix callback path in tasklet dmaengine: imx-dma: fix lockdep issue between irqhandler and tasklet dmaengine: imx-dma: fix slow path issue in prep_dma_cyclic dma/Kconfig: Make TI_EDMA select TI_PRIV_EDMA edma: Update author email address
generated by cgit v1.2.3 (git 2.0.4) at 2025-01-24 02:38:14 +0000