- 09 Nov, 2013 7 commits
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Al Viro authored
Signed-off-by:
Al Viro <viro@zeniv.linux.org.uk>
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Al Viro authored
Signed-off-by:
Al Viro <viro@zeniv.linux.org.uk>
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Al Viro authored
Signed-off-by:
Al Viro <viro@zeniv.linux.org.uk>
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Al Viro authored
The only thing we need it for is alt-sysrq-r (emergency remount r/o) and these days we can do just as well without going through the list of files. Signed-off-by:
Al Viro <viro@zeniv.linux.org.uk>
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Al Viro authored
those have become aliases for rcu_read_{lock,unlock}() Signed-off-by:
Al Viro <viro@zeniv.linux.org.uk>
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Al Viro authored
* 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>
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Al Viro authored
we have too many iterators in fs/dcache.c... Signed-off-by:
Al Viro <viro@zeniv.linux.org.uk>
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- 25 Oct, 2013 33 commits
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Al Viro authored
makes ->permission() and ->d_revalidate() safety in RCU mode independent from vfsmount_lock. Signed-off-by:
Al Viro <viro@zeniv.linux.org.uk>
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Al Viro authored
makes procfs ->premission() instances safety in RCU mode independent from vfsmount_lock. Signed-off-by:
Al Viro <viro@zeniv.linux.org.uk>
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Al Viro authored
makes ->d_hash() and ->d_compare() safety in RCU mode independent from vfsmount_lock. Signed-off-by:
Al Viro <viro@zeniv.linux.org.uk>
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Al Viro authored
makes ->d_hash() and ->d_compare() safety in RCU mode independent from vfsmount_lock. Signed-off-by:
Al Viro <viro@zeniv.linux.org.uk>
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Al Viro authored
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>
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Al Viro authored
makes ->d_managed() safety in RCU mode independent from vfsmount_lock Signed-off-by:
Al Viro <viro@zeniv.linux.org.uk>
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Al Viro authored
makes ->d_hash() and ->d_compare() safety in RCU mode independent from vfsmount_lock. Signed-off-by:
Al Viro <viro@zeniv.linux.org.uk>
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Al Viro authored
makes ->d_hash() and ->d_compare() safety in RCU mode independent from vfsmount_lock Signed-off-by:
Al Viro <viro@zeniv.linux.org.uk>
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Al Viro authored
Signed-off-by:
Al Viro <viro@zeniv.linux.org.uk>
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Miklos Szeredi authored
...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>
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Al Viro authored
Signed-off-by:
Al Viro <viro@zeniv.linux.org.uk>
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Al Viro authored
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>
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Al Viro authored
Signed-off-by:
Al Viro <viro@zeniv.linux.org.uk>
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Al Viro authored
Signed-off-by:
Al Viro <viro@zeniv.linux.org.uk>
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Al Viro authored
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>
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Al Viro authored
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>
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Al Viro authored
Signed-off-by:
Al Viro <viro@zeniv.linux.org.uk>
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Al Viro authored
should've been done 6 years ago... Signed-off-by:
Al Viro <viro@zeniv.linux.org.uk>
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Al Viro authored
->mnt_expire is protected by namespace_sem Signed-off-by:
Al Viro <viro@zeniv.linux.org.uk>
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Al Viro authored
Signed-off-by:
Al Viro <viro@zeniv.linux.org.uk>
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Al Viro authored
MNT_WRITER_UNDERFLOW_LIMIT has been missed 4 years ago when it became unused. Signed-off-by:
Al Viro <viro@zeniv.linux.org.uk>
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Al Viro authored
Signed-off-by:
Al Viro <viro@zeniv.linux.org.uk>
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Al Viro authored
... and don't bother with dropping and regaining vfsmount_lock Signed-off-by:
Al Viro <viro@zeniv.linux.org.uk>
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Al Viro authored
mnt_list is protected by namespace_sem, not vfsmount_lock Signed-off-by:
Al Viro <viro@zeniv.linux.org.uk>
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Al Viro authored
Signed-off-by:
Al Viro <viro@zeniv.linux.org.uk>
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Al Viro authored
Signed-off-by:
Al Viro <viro@zeniv.linux.org.uk>
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Al Viro authored
Signed-off-by:
Al Viro <viro@zeniv.linux.org.uk>
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Al Viro authored
Signed-off-by:
Al Viro <viro@zeniv.linux.org.uk>
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Al Viro authored
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>
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Al Viro authored
Signed-off-by:
Al Viro <viro@zeniv.linux.org.uk>
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Al Viro authored
... rather than open-coding it Signed-off-by:
Al Viro <viro@zeniv.linux.org.uk>
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Al Viro authored
Signed-off-by:
Al Viro <viro@zeniv.linux.org.uk>
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Al Viro authored
Signed-off-by:
Al Viro <viro@zeniv.linux.org.uk>
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