Convert the squashfs filesystem to the new internal mount API as the old
one will be obsoleted and removed. This allows greater flexibility in
communication of mount parameters between userspace, the VFS and the
filesystem.
See Documentation/filesystems/mount_api.txt for more information.
Signed-off-by: David Howells <dhowells@redhat.com>
cc: Phillip Lougher <phillip@squashfs.org.uk>
cc: squashfs-devel@lists.sourceforge.net
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Convert the jffs2 filesystem to the new internal mount API as the old
one will be obsoleted and removed. This allows greater flexibility in
communication of mount parameters between userspace, the VFS and the
filesystem.
See Documentation/filesystems/mount_api.txt for more information.
Signed-off-by: David Howells <dhowells@redhat.com>
cc: David Woodhouse <dwmw2@infradead.org>
cc: linux-mtd@lists.infradead.org
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Convert the cramfs filesystem to the new internal mount API as the old
one will be obsoleted and removed. This allows greater flexibility in
communication of mount parameters between userspace, the VFS and the
filesystem.
See Documentation/filesystems/mount_api.txt for more information.
Signed-off-by: David Howells <dhowells@redhat.com>
Tested-by: Nicolas Pitre <nico@fluxnic.net>
Acked-by: Nicolas Pitre <nico@fluxnic.net>
cc: linux-mtd@lists.infradead.org
cc: linux-block@vger.kernel.org
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Convert the romfs filesystem to the new internal mount API as the old
one will be obsoleted and removed. This allows greater flexibility in
communication of mount parameters between userspace, the VFS and the
filesystem.
See Documentation/filesystems/mount_api.txt for more information.
Signed-off-by: David Howells <dhowells@redhat.com>
cc: linux-mtd@lists.infradead.org
cc: linux-block@vger.kernel.org
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Add an additional keying mode to vfs_get_super() to indicate that only a
single superblock should exist in the system, and that, if it does, further
mounts should invoke reconfiguration upon it.
This allows mount_single() to be replaced.
[Fix by Eric Biggers folded in]
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Create a function, get_tree_bdev(), that is fs_context-aware and a
->get_tree() counterpart of mount_bdev().
It caches the block device pointer in the fs_context struct so that this
information can be passed into sget_fc()'s test and set functions.
Signed-off-by: David Howells <dhowells@redhat.com>
cc: Jens Axboe <axboe@kernel.dk>
cc: linux-block@vger.kernel.org
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
When ext4 file systems were created intentionally with 128 byte inodes,
the rate-limited warning of eventual possible timestamp overflow are
still emitted rather frequently. Remove the warning for now.
Discussion for whether any warning is needed,
and where it should be emitted, can be found at
https://lore.kernel.org/lkml/1567523922.5576.57.camel@lca.pw/.
I can post a separate follow-up patch after the conclusion.
Reported-by: Qian Cai <cai@lca.pw>
Signed-off-by: Deepa Dinamani <deepa.kernel@gmail.com>
Reviewed-by: Andreas Dilger <adilger@dilger.ca>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Make sure that attribute methods are not called after the item
has been removed from the tree. To do so, we
* at the point of no return in removals, grab ->frag_sem
exclusive and mark the fragment dead.
* call the methods of attributes with ->frag_sem taken
shared and only after having verified that the fragment is still
alive.
The main benefit is for method instances - they are
guaranteed that the objects they are accessing *and* all ancestors
are still there. Another win is that we don't need to bother
with extra refcount on config_item when opening a file -
the item will be alive for as long as it stays in the tree, and
we won't touch it/attributes/any associated data after it's
been removed from the tree.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Because s_vfs_rename_mutex is not cluster-wide, multiple nodes can
reverse the roles of which directories are "old" and which are "new" for
the purposes of rename. This can cause deadlocks where two nodes end up
waiting for each other.
There can be several layers of directory dependencies across many nodes.
This patch fixes the problem by acquiring all gfs2_rename's inode glocks
asychronously and waiting for all glocks to be acquired. That way all
inodes are locked regardless of the order.
The timeout value for multiple asynchronous glocks is calculated to be
the total of the individual wait times for each glock times two.
Since gfs2_exchange is very similar to gfs2_rename, both functions are
patched in the same way.
A new async glock wait queue, sd_async_glock_wait, keeps a list of
waiters for these events. If gfs2's holder_wake function detects an
async holder, it wakes up any waiters for the event. The waiter only
tests whether any of its requests are still pending.
Since the glocks are sent to dlm asychronously, the wait function needs
to check to see which glocks, if any, were granted.
If a glock is granted by dlm (and therefore held), its minimum hold time
is checked and adjusted as necessary, as other glock grants do.
If the event times out, all glocks held thus far must be dequeued to
resolve any existing deadlocks. Then, if there are any outstanding
locking requests, we need to loop around and wait for dlm to respond to
those requests too. After we release all requests, we return -ESTALE to
the caller (vfs rename) which loops around and retries the request.
Node1 Node2
--------- ---------
1. Enqueue A Enqueue B
2. Enqueue B Enqueue A
3. A granted
6. B granted
7. Wait for B
8. Wait for A
9. A times out (since Node 1 holds A)
10. Dequeue B (since it was granted)
11. Wait for all requests from DLM
12. B Granted (since Node2 released it in step 10)
13. Rename
14. Dequeue A
15. DLM Grants A
16. Dequeue A (due to the timeout and since we
no longer have B held for our task).
17. Dequeue B
18. Return -ESTALE to vfs
19. VFS retries the operation, goto step 1.
This release-all-locks / acquire-all-locks may slow rename / exchange
down as both nodes struggle in the same way and do the same thing.
However, this will only happen when there is contention for the same
inodes, which ought to be rare.
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
This patch moves the code that updates glock minimum hold
time to a separate function. This will be called by a future
patch.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Before this patch, gfs2_rename added a holder for the rgrp glock to
its array of holders, ghs. There's nothing wrong with that, but this
patch separates it into a separate holder. This is done to ensure
it's always locked last as per the proper glock lock ordering,
and also to pave the way for a future patch in which we will
lock the non-rgrp glocks asynchronously.
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
The brelse() function tests whether its argument is NULL and then
returns immediately. Thus the test around the call is not needed.
This issue was detected by using the Coccinelle software.
[The same applies to brelse() in gfs2_dir_no_add (which Coccinelle
apparently missed), so fix that as well.]
Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
OSTA UDF standard defines that domain identifier in logical volume
descriptor and file set descriptor should contain a particular string
and the identifier suffix contains flags possibly making media
write-protected. Verify these constraints and allow only read-only mount
if they are not met.
Tested-by: Steven J. Magnani <steve@digidescorp.com>
Reviewed-by: Steven J. Magnani <steve@digidescorp.com>
Signed-off-by: Jan Kara <jack@suse.cz>
When performing rename operation with RENAME_WHITEOUT flag, we will
hold AGF lock to allocate or free extents in manipulating the dirents
firstly, and then doing the xfs_iunlink_remove() call last to hold
AGI lock to modify the tmpfile info, so we the lock order AGI->AGF.
The big problem here is that we have an ordering constraint on AGF
and AGI locking - inode allocation locks the AGI, then can allocate
a new extent for new inodes, locking the AGF after the AGI. Hence
the ordering that is imposed by other parts of the code is AGI before
AGF. So we get an ABBA deadlock between the AGI and AGF here.
Process A:
Call trace:
? __schedule+0x2bd/0x620
schedule+0x33/0x90
schedule_timeout+0x17d/0x290
__down_common+0xef/0x125
? xfs_buf_find+0x215/0x6c0 [xfs]
down+0x3b/0x50
xfs_buf_lock+0x34/0xf0 [xfs]
xfs_buf_find+0x215/0x6c0 [xfs]
xfs_buf_get_map+0x37/0x230 [xfs]
xfs_buf_read_map+0x29/0x190 [xfs]
xfs_trans_read_buf_map+0x13d/0x520 [xfs]
xfs_read_agf+0xa6/0x180 [xfs]
? schedule_timeout+0x17d/0x290
xfs_alloc_read_agf+0x52/0x1f0 [xfs]
xfs_alloc_fix_freelist+0x432/0x590 [xfs]
? down+0x3b/0x50
? xfs_buf_lock+0x34/0xf0 [xfs]
? xfs_buf_find+0x215/0x6c0 [xfs]
xfs_alloc_vextent+0x301/0x6c0 [xfs]
xfs_ialloc_ag_alloc+0x182/0x700 [xfs]
? _xfs_trans_bjoin+0x72/0xf0 [xfs]
xfs_dialloc+0x116/0x290 [xfs]
xfs_ialloc+0x6d/0x5e0 [xfs]
? xfs_log_reserve+0x165/0x280 [xfs]
xfs_dir_ialloc+0x8c/0x240 [xfs]
xfs_create+0x35a/0x610 [xfs]
xfs_generic_create+0x1f1/0x2f0 [xfs]
...
Process B:
Call trace:
? __schedule+0x2bd/0x620
? xfs_bmapi_allocate+0x245/0x380 [xfs]
schedule+0x33/0x90
schedule_timeout+0x17d/0x290
? xfs_buf_find+0x1fd/0x6c0 [xfs]
__down_common+0xef/0x125
? xfs_buf_get_map+0x37/0x230 [xfs]
? xfs_buf_find+0x215/0x6c0 [xfs]
down+0x3b/0x50
xfs_buf_lock+0x34/0xf0 [xfs]
xfs_buf_find+0x215/0x6c0 [xfs]
xfs_buf_get_map+0x37/0x230 [xfs]
xfs_buf_read_map+0x29/0x190 [xfs]
xfs_trans_read_buf_map+0x13d/0x520 [xfs]
xfs_read_agi+0xa8/0x160 [xfs]
xfs_iunlink_remove+0x6f/0x2a0 [xfs]
? current_time+0x46/0x80
? xfs_trans_ichgtime+0x39/0xb0 [xfs]
xfs_rename+0x57a/0xae0 [xfs]
xfs_vn_rename+0xe4/0x150 [xfs]
...
In this patch we move the xfs_iunlink_remove() call to
before acquiring the AGF lock to preserve correct AGI/AGF locking
order.
Signed-off-by: kaixuxia <kaixuxia@tencent.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Add a helper that validates the startblock is valid. This checks for a
non-zero block on the main device, but skips that check for blocks on
the realtime device.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
we are not retaining dentries there anyway (simple_dentry_operations),
so d_delete()+dput() == d_drop()+dput()
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
The rules for nd->root are messy:
* if we have LOOKUP_ROOT, it doesn't contribute to refcounts
* if we have LOOKUP_RCU, it doesn't contribute to refcounts
* if nd->root.mnt is NULL, it doesn't contribute to refcounts
* otherwise it does contribute
terminate_walk() needs to drop the references if they are contributing.
So everything else should be careful not to confuse it, leading to
rather convoluted code.
It's easier to keep track of whether we'd grabbed the reference(s)
explicitly. Use a new flag for that. Don't bother with zeroing
nd->root.mnt on unlazy failures and in terminate_walk - it's not
needed anymore (terminate_walk() won't care and the next path_init()
will zero nd->root in !LOOKUP_ROOT case anyway).
Resulting rules for nd->root refcounts are much simpler: they are
contributing iff LOOKUP_ROOT_GRABBED is set in nd->flags.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
