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2013-11-09iget/iget5: don't bother with ->i_lock until we find a matchAl Viro4-16/+16
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-11-09VFS: Put a small type field into struct dentry::d_flagsDavid Howells3-82/+158
Put a type field into struct dentry::d_flags to indicate if the dentry is one of the following types that relate particularly to pathwalk: Miss (negative dentry) Directory "Automount" directory (defective - no i_op->lookup()) Symlink Other (regular, socket, fifo, device) The type field is set to one of the first five types on a dentry by calls to __d_instantiate() and d_obtain_alias() from information in the inode (if one is given). The type is cleared by dentry_unlink_inode() when it reconstitutes an existing dentry as a negative dentry. Accessors provided are: d_set_type(dentry, type) d_is_directory(dentry) d_is_autodir(dentry) d_is_symlink(dentry) d_is_file(dentry) d_is_negative(dentry) d_is_positive(dentry) A bunch of checks in pathname resolution switched to those. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-11-09elf{,_fdpic} coredump: get rid of pointless if (siginfo->si_signo)Al Viro2-37/+31
we can't get to do_coredump() if that condition isn't satisfied... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-11-09constify do_coredump() argumentAl Viro4-6/+6
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-11-09constify copy_siginfo_to_user{,32}()Al Viro14-14/+14
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-11-09... and kill anon_inode_getfile_private()Al Viro2-69/+0
it's a seriously misguided API, now fortunately without users. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-11-09rework aio migrate pages to use aio fsBenjamin LaHaise1-6/+57
Don't abuse anon_inodes.c to host private files needed by aio; we can bloody well declare a mini-fs of our own instead of patching up what anon_inodes can create for us. Tested-by: Benjamin LaHaise <bcrl@kvack.org> Acked-by: Benjamin LaHaise <bcrl@kvack.org> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-11-09take anon inode allocation to libfs.cAl Viro3-48/+46
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-11-09new helper: dump_align()Al Viro5-17/+15
dump_skip to given alignment... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-11-09spufs: get rid of dump_emit() wrappersAl Viro1-49/+20
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-11-09dump_skip(): dump_seek() replacement taking coredump_paramsAl Viro6-43/+22
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-11-09make dump_emit() use vfs_write() instead of banging at ->f_op->write directlyAl Viro1-5/+12
... and deal with short writes properly - the output might be to pipe, after all; as it is, e.g. no-MMU case of elf_fdpic coredump can write a whole lot more than a page worth of data at one call. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-11-09binfmt_elf: count notes towards coredump limitAl Viro1-3/+0
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-11-09aout: switch to dump_emitAl Viro2-16/+11
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-11-09switch elf_coredump_extra_notes_write() to dump_emit()Al Viro6-38/+30
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-11-09convert the rest of binfmt_elf_fdpic to dump_emit()Al Viro1-79/+31
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-11-09binfmt_elf: convert writing actual dump pages to dump_emit()Al Viro1-11/+3
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-11-09switch elf_core_write_extra_data() to dump_emit()Al Viro5-13/+11
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-11-09switch elf_core_write_extra_phdrs() to dump_emit()Al Viro6-21/+15
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-11-09new helper: dump_emit()Al Viro4-37/+40
dump_write() analog, takes core_dump_params instead of file, keeps track of the amount written in cprm->written and checks for cprm->limit. Start using it in binfmt_elf.c... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-11-09restore 32bit aout coredumpAl Viro1-34/+36
just getting rid of bitrot Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-11-09no need to keep brlock macros anymore...Al Viro1-10/+0
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-11-09coda_revalidate_inode(): switch to passing inode...Al Viro3-4/+3
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-11-09fold __d_shrink() into its only remaining callerAl Viro1-22/+10
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-11-09get rid of s_files and files_lockAl Viro5-156/+2
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>
2013-11-09get rid of {lock,unlock}_rcu_walk()Al Viro1-24/+14
those have become aliases for rcu_read_{lock,unlock}() Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-11-09RCU'd vfsmountsAl Viro6-83/+136
* 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 Viro1-110/+85
we have too many iterators in fs/dcache.c... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-25fuse: rcu-delay freeing fuse_connAl Viro3-2/+4
makes ->permission() and ->d_revalidate() safety in RCU mode independent from vfsmount_lock. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-25pid_namespace: make freeing struct pid_namespace rcu-delayedAl Viro2-1/+8
makes procfs ->premission() instances safety in RCU mode independent from vfsmount_lock. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-25ncpfs: rcu-delay unload_nls() and freeing ncp_serverAl Viro2-8/+13
makes ->d_hash() and ->d_compare() safety in RCU mode independent from vfsmount_lock. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-25fat: rcu-delay unloading nls and freeing sbiAl Viro2-8/+12
makes ->d_hash() and ->d_compare() safety in RCU mode independent from vfsmount_lock. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-25cifs: rcu-delay unload_nls() and freeing sbiAl Viro2-2/+9
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>
2013-10-25autofs4: make freeing sbi rcu-delayedAl Viro2-9/+5
makes ->d_managed() safety in RCU mode independent from vfsmount_lock Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-25adfs: delayed freeing of sbiAl Viro2-5/+7
makes ->d_hash() and ->d_compare() safety in RCU mode independent from vfsmount_lock. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-25hpfs: make freeing sbi and codetables rcu-delayedAl Viro2-14/+15
makes ->d_hash() and ->d_compare() safety in RCU mode independent from vfsmount_lock Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-25make freeing super_block rcu-delayedAl Viro2-1/+2
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-25vfs: introduce d_instantiate_no_diralias()Miklos Szeredi5-40/+33
...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>
2013-10-25move taking vfsmount_lock down into prepend_path()Al Viro1-9/+2
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-25split __lookup_mnt() in two functionsAl Viro4-25/+30
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>
2013-10-25uninline destroy_super(), consolidate alloc_super()Al Viro1-120/+86
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-25isofs: don't pass dentry to isofs_hash{i,}_common()Al Viro1-6/+6
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-25new helpers: lock_mount_hash/unlock_mount_hashAl Viro5-54/+64
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>
2013-10-25don't bother with vfsmount_lock in mounts_poll()Al Viro1-4/+4
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>
2013-10-25namespace.c: get rid of mnt_ghostsAl Viro3-18/+9
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-25fold dup_mnt_ns() into its only surviving callerAl Viro1-30/+18
should've been done 6 years ago... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-25mnt_set_expiry() doesn't need vfsmount_lockAl Viro1-2/+0
->mnt_expire is protected by namespace_sem Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-25finish_automount() doesn't need vfsmount_lock for removal from expiry listAl Viro1-2/+0
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-25fs/namespace.c: bury long-dead defineAl Viro1-2/+0
MNT_WRITER_UNDERFLOW_LIMIT has been missed 4 years ago when it became unused. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-25fold mntfree() into mntput_no_expire()Al Viro1-23/+16
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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