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2013-11-09switch elf_core_write_extra_phdrs() to dump_emit()Al Viro2-3/+5
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-11-09new helper: dump_emit()Al Viro2-37/+37
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>
2013-11-09coda_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 Viro4-143/+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 Viro4-82/+133
* 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>
2013-10-25ncpfs: 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 Viro1-1/+1
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-25vfs: introduce d_instantiate_no_diralias()Miklos Szeredi4-40/+32
...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>
2013-10-25do_remount(): pull touch_mnt_namespace() upAl Viro1-5/+1
... and don't bother with dropping and regaining vfsmount_lock Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-25dup_mnt_ns(): get rid of pointless grabbing of vfsmount_lockAl Viro1-2/+0
mnt_list is protected by namespace_sem, not vfsmount_lock Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-25fs_is_visible only needs namespace_sem held sharedAl Viro1-2/+2
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-25initialize namespace_sem staticallyAl Viro1-3/+1
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-25file->f_op is never NULL...Al Viro23-87/+67
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-25consolidate the reassignments of ->f_op in ->open() instancesAl Viro1-2/+4
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-25put_mnt_ns(): use drop_collected_mounts()Al Viro1-5/+1
... rather than open-coding it Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-25ncpfs: switch to %p[dD]Al Viro2-43/+24
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-25ubifs: switch to %pdAl Viro3-34/+29
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-25nfsd: switch to %p[dD]Al Viro5-37/+31
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-25nfs: use %p[dD] instead of open-coded (and often racy) equivalentsAl Viro11-186/+119
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-25befs: split symlink iops in two - for short and long symlinks resp.Al Viro1-30/+31
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-25new helper: kfree_put_link()Al Viro7-38/+14
duplicated to hell and back... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-25libfs: get exports to definitions of objects being exported...Al Viro1-35/+34
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-25ecryptfs: ->lower_path.dentry is never NULLAl Viro1-2/+1
... on anything found via ->d_fsdata Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-25ecryptfs: get rid of ecryptfs_set_dentry_lower{,_mnt}Al Viro3-18/+3
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-25ecryptfs: don't leave RCU pathwalk immediatelyAl Viro2-15/+20
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>
2013-10-25ecryptfs: check DCACHE_OP_REVALIDATE instead of ->d_opAl Viro1-1/+1
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-259p: make v9fs_cache_inode_{get,put,set}_cookie empty inlines for !9P_CACHEFSAl Viro4-12/+12
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-05Merge branch 'for-linus' of ↵Linus Torvalds6-17/+39
git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs Pull btrfs fixes from Chris Mason: "This is a small collection of fixes, including a regression fix from Liu Bo that solves rare crashes with compression on. I've merged my for-linus up to 3.12-rc3 because the top commit is only meant for 3.12. The rest of the fixes are also available in my master branch on top of my last 3.11 based pull" * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs: btrfs: Fix crash due to not allocating integrity data for a bioset Btrfs: fix a use-after-free bug in btrfs_dev_replace_finishing Btrfs: eliminate races in worker stopping code Btrfs: fix crash of compressed writes Btrfs: fix transid verify errors when recovering log tree
2013-10-05btrfs: Fix crash due to not allocating integrity data for a biosetDarrick J. Wong1-0/+8
When btrfs creates a bioset, we must also allocate the integrity data pool. Otherwise btrfs will crash when it tries to submit a bio to a checksumming disk: BUG: unable to handle kernel NULL pointer dereference at 0000000000000018 IP: [<ffffffff8111e28a>] mempool_alloc+0x4a/0x150 PGD 2305e4067 PUD 23063d067 PMD 0 Oops: 0000 [#1] PREEMPT SMP Modules linked in: btrfs scsi_debug xfs ext4 jbd2 ext3 jbd mbcache sch_fq_codel eeprom lpc_ich mfd_core nfsd exportfs auth_rpcgss af_packet raid6_pq xor zlib_deflate libcrc32c [last unloaded: scsi_debug] CPU: 1 PID: 4486 Comm: mount Not tainted 3.12.0-rc1-mcsum #2 Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 task: ffff8802451c9720 ti: ffff880230698000 task.ti: ffff880230698000 RIP: 0010:[<ffffffff8111e28a>] [<ffffffff8111e28a>] mempool_alloc+0x4a/0x150 RSP: 0018:ffff880230699688 EFLAGS: 00010286 RAX: 0000000000000001 RBX: 0000000000000000 RCX: 00000000005f8445 RDX: 0000000000000001 RSI: 0000000000000010 RDI: 0000000000000000 RBP: ffff8802306996f8 R08: 0000000000011200 R09: 0000000000000008 R10: 0000000000000020 R11: ffff88009d6e8000 R12: 0000000000011210 R13: 0000000000000030 R14: ffff8802306996b8 R15: ffff8802451c9720 FS: 00007f25b8a16800(0000) GS:ffff88024fc80000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b CR2: 0000000000000018 CR3: 0000000230576000 CR4: 00000000000007e0 Stack: ffff8802451c9720 0000000000000002 ffffffff81a97100 0000000000281250 ffffffff81a96480 ffff88024fc99150 ffff880228d18200 0000000000000000 0000000000000000 0000000000000040 ffff880230e8c2e8 ffff8802459dc900 Call Trace: [<ffffffff811b2208>] bio_integrity_alloc+0x48/0x1b0 [<ffffffff811b26fc>] bio_integrity_prep+0xac/0x360 [<ffffffff8111e298>] ? mempool_alloc+0x58/0x150 [<ffffffffa03e8041>] ? alloc_extent_state+0x31/0x110 [btrfs] [<ffffffff81241579>] blk_queue_bio+0x1c9/0x460 [<ffffffff8123e58a>] generic_make_request+0xca/0x100 [<ffffffff8123e639>] submit_bio+0x79/0x160 [<ffffffffa03f865e>] btrfs_map_bio+0x48e/0x5b0 [btrfs] [<ffffffffa03c821a>] btree_submit_bio_hook+0xda/0x110 [btrfs] [<ffffffffa03e7eba>] submit_one_bio+0x6a/0xa0 [btrfs] [<ffffffffa03ef450>] read_extent_buffer_pages+0x250/0x310 [btrfs] [<ffffffff8125eef6>] ? __radix_tree_preload+0x66/0xf0 [<ffffffff8125f1c5>] ? radix_tree_insert+0x95/0x260 [<ffffffffa03c66f6>] btree_read_extent_buffer_pages.constprop.128+0xb6/0x120 [btrfs] [<ffffffffa03c8c1a>] read_tree_block+0x3a/0x60 [btrfs] [<ffffffffa03caefd>] open_ctree+0x139d/0x2030 [btrfs] [<ffffffffa03a282a>] btrfs_mount+0x53a/0x7d0 [btrfs] [<ffffffff8113ab0b>] ? pcpu_alloc+0x8eb/0x9f0 [<ffffffff81167305>] ? __kmalloc_track_caller+0x35/0x1e0 [<ffffffff81176ba0>] mount_fs+0x20/0xd0 [<ffffffff81191096>] vfs_kern_mount+0x76/0x120 [<ffffffff81193320>] do_mount+0x200/0xa40 [<ffffffff81135cdb>] ? strndup_user+0x5b/0x80 [<ffffffff81193bf0>] SyS_mount+0x90/0xe0 [<ffffffff8156d31d>] system_call_fastpath+0x1a/0x1f Code: 4c 8d 75 a8 4c 89 6d e8 45 89 e0 4c 8d 6f 30 48 89 5d d8 41 83 e0 af 48 89 fb 49 83 c6 18 4c 89 7d f8 65 4c 8b 3c 25 c0 b8 00 00 <48> 8b 73 18 44 89 c7 44 89 45 98 ff 53 20 48 85 c0 48 89 c2 74 RIP [<ffffffff8111e28a>] mempool_alloc+0x4a/0x150 RSP <ffff880230699688> CR2: 0000000000000018 ---[ end trace 7a96042017ed21e2 ]--- Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
generated by cgit v1.2.3 (git 2.39.0) at 2025-02-02 13:51:02 +0300