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The comment is no longer true as (now that the BKL conversion is
finished) a spinlock _is_ now used to protect file_lock_list,
blocked_list and inode->i_flock.
Signed-off-by: Matt Fleming <matt.fleming@linux.intel.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
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This introduces a new per-superblock mutex in UFS to replace
the big kernel lock. I have been careful to avoid nested
calls to lock_ufs and to get the lock order right with
respect to other mutexes, in particular lock_super.
I did not make any attempt to prove that the big kernel
lock is not needed in a particular place in the code,
which is very possible.
The mutex has a significant performance impact, so it is only
used on SMP or PREEMPT configurations.
As Nick Piggin noticed, any allocation inside of the lock
may end up deadlocking when we get to ufs_getfrag_block
in the reclaim task, so we now use GFP_NOFS.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Tested-by: Nick Bowler <nbowler@elliptictech.com>
Cc: Evgeniy Dushistov <dushistov@mail.ru>
Cc: Nick Piggin <npiggin@gmail.com>
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This removes the BKL in hpfs in a rather awful
way, by making the code only work on uniprocessor
systems without kernel preemption, as suggested
by Andi Kleen.
The HPFS code probably has close to zero remaining
users on current kernels, all archeological uses of
the file system can probably be done with the significant
restrictions.
The hpfs_lock/hpfs_unlock functions are left in the
code, sincen Mikulas has indicated that he is still
interested in fixing it in a better way.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Andi Kleen <ak@linux.intel.com>
Cc: Mikulas Patocka <mikulas@artax.karlin.mff.cuni.cz>
Cc: linux-fsdevel@vger.kernel.org
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According to Russell King, adfs was written to not require the big
kernel lock, and all inode updates are done under adfs_dir_lock.
All other metadata in adfs is read-only and does not require locking.
The use of the BKL is the result of various pushdowns from the VFS
operations.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Russell King <rmk@arm.linux.org.uk>
Cc: Stuart Swales <stuart.swales.croftnuisk@gmail.com>
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git://git.kernel.org/pub/scm/linux/kernel/git/ecryptfs/ecryptfs-2.6
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ecryptfs/ecryptfs-2.6:
eCryptfs: Copy up lower inode attrs in getattr
ecryptfs: read on a directory should return EISDIR if not supported
eCryptfs: Handle NULL nameidata pointers
eCryptfs: Revert "dont call lookup_one_len to avoid NULL nameidata"
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Add fs/eventfd.c to filesystems docbook.
Make typo corrections in fs/eventfd.c.
Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Cc: Davide Libenzi <davidel@xmailserver.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client:
ceph: keep reference to parent inode on ceph_dentry
ceph: queue cap_snaps once per realm
libceph: fix socket write error handling
libceph: fix socket read error handling
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* git://git.kernel.org/pub/scm/linux/kernel/git/sfrench/cifs-2.6:
[CIFS] update cifs version
cifs: Fix regression in LANMAN (LM) auth code
cifs: fix handling of scopeid in cifs_convert_address
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Update version to 1.71 so we can more easily spot modules with the last two fixes
Signed-off-by: Steve French <sfrench@us.ibm.com>
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LANMAN response length was changed to 16 bytes instead of 24 bytes.
Revert it back to 24 bytes.
Signed-off-by: Shirish Pargaonkar <shirishpargaonkar@gmail.com>
CC: stable@kernel.org
Signed-off-by: Steve French <sfrench@us.ibm.com>
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The lower filesystem may do some type of inode revalidation during a
getattr call. eCryptfs should take advantage of that by copying the
lower inode attributes to the eCryptfs inode after a call to
vfs_getattr() on the lower inode.
I originally wrote this fix while working on eCryptfs on nfsv3 support,
but discovered it also fixed an eCryptfs on ext4 nanosecond timestamp
bug that was reported.
https://bugs.launchpad.net/bugs/613873
Cc: <stable@kernel.org>
Signed-off-by: Tyler Hicks <tyhicks@linux.vnet.ibm.com>
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read() calls against a file descriptor connected to a directory are
incorrectly returning EINVAL rather than EISDIR:
[EISDIR]
[XSI] [Option Start] The fildes argument refers to a directory and the
implementation does not allow the directory to be read using read()
or pread(). The readdir() function should be used instead. [Option End]
This occurs because we do not have a .read operation defined for
ecryptfs directories. Connect this up to generic_read_dir().
BugLink: http://bugs.launchpad.net/bugs/719691
Signed-off-by: Andy Whitcroft <apw@canonical.com>
Signed-off-by: Tyler Hicks <tyhicks@linux.vnet.ibm.com>
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Allow for NULL nameidata pointers in eCryptfs create, lookup, and
d_revalidate functions.
Signed-off-by: Tyler Hicks <tyhicks@linux.vnet.ibm.com>
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When creating a new dentry we now hold a reference to the parent
inode in the ceph_dentry. This is required due to the new RCU
changes from 949854d0, which set dentry->d_parent to NULL in d_kill before
calling the ->release() callback. If/when that behavior is changed, we can
revert this hack.
Signed-off-by: Yehuda Sadeh <yehuda@hq.newdream.net>
Signed-off-by: Sage Weil <sage@newdream.net>
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git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq
* 'fixes-2.6.38' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq:
workqueue: make sure MAYDAY_INITIAL_TIMEOUT is at least 2 jiffies long
workqueue, freezer: unify spelling of 'freeze' + 'able' to 'freezable'
workqueue: wake up a worker when a rescuer is leaving a gcwq
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This reverts commit 21edad32205e97dc7ccb81a85234c77e760364c8 and commit
93c3fe40c279f002906ad14584c30671097d4394, which fixed a regression by
the former.
Al Viro pointed out bypassed dcache lookups in
ecryptfs_new_lower_dentry(), misuse of vfs_path_lookup() in
ecryptfs_lookup_one_lower() and a dislike of passing nameidata to the
lower filesystem.
Reported-by: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: Tyler Hicks <tyhicks@linux.vnet.ibm.com>
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Validate number of blocks in map and remove redundant variable.
Signed-off-by: Timo Warns <warns@pre-sense.de>
Cc: stable@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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* 'for-2.6.38' of git://linux-nfs.org/~bfields/linux:
nfsd: correctly handle return value from nfsd_map_name_to_*
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The code finds, the '%' sign in an ipv6 address and copies that to a
buffer allocated on the stack. It then ignores that buffer, and passes
'pct' to simple_strtoul(), which doesn't work right because we're
comparing 'endp' against a completely different string.
Fix it by passing the correct pointer. While we're at it, this is a
good candidate for conversion to strict_strtoul as well.
Cc: stable@kernel.org
Cc: David Howells <dhowells@redhat.com>
Reported-by: Björn JACKE <bj@sernet.de>
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
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This reverts commit 75f1dc0d076d ("block: check bdev_read_only() from
blkdev_get()"). That commit added stricter checking to make sure
devices that were being used read-only were actually opened in that
mode.
It turns out that the change breaks a bunch of kernel code that opens
block devices. Affected systems include dm, md, and the loop device.
Because strict checking for read-only opens of block devices was not
done before this, the code that opens the devices was opening them
read-write even if they were being used read-only. Auditing all that
code will take time, and new userspace packages for dm, mdadm, etc.
will also be required.
Signed-off-by: Chuck Ebbert <cebbert@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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These functions return an nfs status, not a host_err. So don't
try to convert before returning.
This is a regression introduced by
3c726023402a2f3b28f49b9d90ebf9e71151157d; I fixed up two of the callers,
but missed these two.
Cc: stable@kernel.org
Reported-by: Herbert Poetzl <herbert@13thfloor.at>
Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
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When Al moved the nameidata_dentry_drop_rcu_maybe() call into the
do_follow_link function in commit 844a391799c2 ("nothing in
do_follow_link() is going to see RCU"), he mistakenly left the
BUG_ON(inode != path->dentry->d_inode);
behind. Which would otherwise be ok, but that BUG_ON() really needs to
be _after_ dropping RCU, since the dentry isn't necessarily stable
otherwise.
So complete the code movement in that commit, and move the BUG_ON() into
do_follow_link() too. This means that we need to pass in 'inode' as an
argument (just for this one use), but that's a small thing. And
eventually we may be confident enough in our path lookup that we can
just remove the BUG_ON() and the unnecessary inode argument.
Reported-and-tested-by: Eric Dumazet <eric.dumazet@gmail.com>
Acked-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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There are two spellings in use for 'freeze' + 'able' - 'freezable' and
'freezeable'. The former is the more prominent one. The latter is
mostly used by workqueue and in a few other odd places. Unify the
spelling to 'freezable'.
Signed-off-by: Tejun Heo <tj@kernel.org>
Reported-by: Alan Stern <stern@rowland.harvard.edu>
Acked-by: "Rafael J. Wysocki" <rjw@sisk.pl>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Acked-by: Dmitry Torokhov <dtor@mail.ru>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Alex Dubov <oakad@yahoo.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Steven Whitehouse <swhiteho@redhat.com>
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* 'for-2.6.38' of git://linux-nfs.org/~bfields/linux:
nfsd: break lease on unlink due to rename
nfsd4: acquire only one lease per file
nfsd4: modify fi_delegations under recall_lock
nfsd4: remove unused deleg dprintk's.
nfsd4: split lease setting into separate function
nfsd4: fix leak on allocation error
nfsd4: add helper function for lease setup
nfsd4: split up nfsd_break_deleg_cb
NFSD: memory corruption due to writing beyond the stat array
NFSD: use nfserr for status after decode_cb_op_status
nfsd: don't leak dentry count on mnt_want_write failure
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git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6:
get rid of nameidata_dentry_drop_rcu() calling nameidata_drop_rcu()
drop out of RCU in return_reval
split do_revalidate() into RCU and non-RCU cases
in do_lookup() split RCU and non-RCU cases of need_revalidate
nothing in do_follow_link() is going to see RCU
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* git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-unstable:
Btrfs: check return value of alloc_extent_map()
Btrfs - Fix memory leak in btrfs_init_new_device()
btrfs: prevent heap corruption in btrfs_ioctl_space_info()
Btrfs: Fix balance panic
Btrfs: don't release pages when we can't clear the uptodate bits
Btrfs: fix page->private races
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task_show_regs used to be a debugging aid in the early bringup days
of Linux on s390. /proc/<pid>/status is a world readable file, it
is not a good idea to show the registers of a process. The only
correct fix is to remove task_show_regs.
Reported-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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can't happen anymore and didn't work right anyway
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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... thus killing the need to handle drop-from-RCU in d_revalidate()
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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fixing oopsen in lookup_one_len()
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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and use unlikely() instead of gotos, for fsck sake...
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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I add the check on the return value of alloc_extent_map() to several places.
In addition, alloc_extent_map() returns only the address or NULL.
Therefore, check by IS_ERR() is unnecessary. So, I remove IS_ERR() checking.
Signed-off-by: Tsutomu Itoh <t-itoh@jp.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
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Memory allocated by calling kstrdup() should be freed.
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
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Commit bf5fc093c5b625e4259203f1cee7ca73488a5620 refactored
btrfs_ioctl_space_info() and introduced several security issues.
space_args.space_slots is an unsigned 64-bit type controlled by a
possibly unprivileged caller. The comparison as a signed int type
allows providing values that are treated as negative and cause the
subsequent allocation size calculation to wrap, or be truncated to 0.
By providing a size that's truncated to 0, kmalloc() will return
ZERO_SIZE_PTR. It's also possible to provide a value smaller than the
slot count. The subsequent loop ignores the allocation size when
copying data in, resulting in a heap overflow or write to ZERO_SIZE_PTR.
The fix changes the slot count type and comparison typecast to u64,
which prevents truncation or signedness errors, and also ensures that we
don't copy more data than we've allocated in the subsequent loop. Note
that zero-size allocations are no longer possible since there is already
an explicit check for space_args.space_slots being 0 and truncation of
this value is no longer an issue.
Signed-off-by: Dan Rosenberg <drosenberg@vsecurity.com>
Signed-off-by: Josef Bacik <josef@redhat.com>
Reviewed-by: Josef Bacik <josef@redhat.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
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Mark the cloned backref_node as checked in clone_backref_node()
Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
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Btrfs tracks uptodate state in an rbtree as well as in the
page bits. This is supposed to enable us to use block sizes other than
the page size, but there are a few parts still missing before that
completely works.
But, our readpage routine trusts this additional range based tracking
of uptodateness, much in the same way the buffer head up to date bits
are trusted for the other filesystems.
The problem is that sometimes we need to allocate memory in order to
split records in the rbtree, even when we are just clearing bits. This
can be difficult when our clearing function is called GFP_ATOMIC, which
can happen in the releasepage path.
So, what happens today looks like this:
releasepage called with GFP_ATOMIC
btrfs_releasepage calls clear_extent_bit
clear_extent_bit fails to allocate ram, leaving the up to date bit set
btrfs_releasepage returns success
The end result is the page being gone, but btrfs thinking the range is
up to date. Later on if someone tries to read that same page, the
btrfs readpage code will return immediately thinking the page is already
up to date.
This commit fixes things to fail the releasepage when we can't clear the
extent state bits. It covers both data pages and metadata tree blocks.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
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There is a race where btrfs_releasepage can drop the
page->private contents just as alloc_extent_buffer is setting
up pages for metadata. Because of how the Btrfs page flags work,
this results in us skipping the crc on the page during IO.
This patch sovles the race by waiting until after the extent buffer
is inserted into the radix tree before it sets page private.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
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4795bb37effb7b8fe77e2d2034545d062d3788a8 "nfsd: break lease on unlink,
link, and rename", only broke the lease on the file that was being
renamed, and didn't handle the case where the target path refers to an
already-existing file that will be unlinked by a rename--in that case
the target file should have any leases broken as well.
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
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Instead of acquiring one lease each time another client opens a file,
nfsd can acquire just one lease to represent all of them, and reference
count it to determine when to release it.
This fixes a regression introduced by
c45821d263a8a5109d69a9e8942b8d65bcd5f31a "locks: eliminate fl_mylease
callback": after that patch, only the struct file * is used to determine
who owns a given lease. But since we recently converted the server to
share a single struct file per open, if we acquire multiple leases on
the same file from nfsd, it then becomes impossible on unlocking a lease
to determine which of those leases (all of whom share the same struct
file *) we meant to remove.
Thanks to Takashi Iwai <tiwai@suse.de> for catching a bug in a previous
version of this patch.
Tested-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
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Modify fi_delegations only under the recall_lock, allowing us to use
that list on lease breaks.
Also some trivial cleanup to simplify later changes.
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
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These aren't all that useful, and get in the way of the next steps.
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
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Splitting some code into a separate function which we'll be adding some
more to.
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
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Also share some common exit code.
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
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Signed-off-by: J. Bruce Fields <bfields@redhat.com>
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We'll be adding some more code here soon.
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
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If nfsd fails to find an exported via NFS file in the readahead cache, it
should increment corresponding nfsdstats counter (ra_depth[10]), but due to a
bug it may instead write to ra_depth[11], corrupting the following field.
In a kernel with NFSDv4 compiled in the corruption takes the form of an
increment of a counter of the number of NFSv4 operation 0's received; since
there is no operation 0, this is harmless.
In a kernel with NFSDv4 disabled it corrupts whatever happens to be in the
memory beyond nfsdstats.
Signed-off-by: Konstantin Khorenko <khorenko@openvz.org>
Cc: stable@kernel.org
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
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Bugs introduced in 85a56480191ca9f08fc775c129b9eb5c8c1f2c05
"NFSD: Update XDR decoders in NFSv4 callback client"
Cc: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
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The exit cleanup isn't quite right here.
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
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git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4
* 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4:
jbd2: call __jbd2_log_start_commit with j_state_lock write locked
ext4: serialize unaligned asynchronous DIO
ext4: make grpinfo slab cache names static
ext4: Fix data corruption with multi-block writepages support
ext4: fix up ext4 error handling
ext4: unregister features interface on module unload
ext4: fix panic on module unload when stopping lazyinit thread
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