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git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs
Pull btrfs updates from Chris Mason:
"This includes a fairly large change from Josef around data writeback
completion. Before, the writeback wasn't completed until the metadata
insertions for the extent were done, and this made for fairly large
latency spikes on the last page of each ordered extent.
We already had a separate mechanism for tracking pending metadata
insertions, so Josef just needed to tweak things a little to end
writeback earlier on the page. Overall it makes us much friendly to
memory reclaim and lowers latencies quite a lot for synchronous IO.
Jan Schmidt has finished some background work required to track btree
blocks as they go through changes in ownership. It's the missing
piece he needed for both btrfs send/receive and subvolume quotas.
Neither of those are ready yet, but the new tracking code is included
here. Most of the time, the new code is off. It is only used by
scrub and other backref walkers.
Stefan Behrens has added io failure tracking. This includes counters
for which drives are causing the most trouble so the admin (or an
automated tool) can choose to kick them out. We're tracking IO
errors, crc errors, and generation checks we do on each metadata
block.
RAID5/6 did miss the cut this time because I'm having trouble with
corruptions. I'll nail it down next week and post as a beta testing
before 3.6"
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs: (58 commits)
Btrfs: fix tree mod log rewinded level and rewinding of moved keys
Btrfs: fix tree mod log del_ptr
Btrfs: add tree_mod_dont_log helper
Btrfs: add missing spin_lock for insertion into tree mod log
Btrfs: add inodes before dropping the extent lock in find_all_leafs
Btrfs: use delayed ref sequence numbers for all fs-tree updates
Btrfs: fix false positive in check-integrity on unmount
Btrfs: fix runtime warning in check-integrity check data mode
Btrfs: set ioprio of scrub readahead to idle
Btrfs: fix return code in drop_objectid_items
Btrfs: check to see if the inode is in the log before fsyncing
Btrfs: return value of btrfs_read_buffer is checked correctly
Btrfs: read device stats on mount, write modified ones during commit
Btrfs: add ioctl to get and reset the device stats
Btrfs: add device counters for detected IO and checksum errors
btrfs: Drop unused function btrfs_abort_devices()
Btrfs: fix the same inode id problem when doing auto defragment
Btrfs: fall back to non-inline if we don't have enough space
Btrfs: fix how we deal with the orphan block rsv
Btrfs: convert the inode bit field to use the actual bit operations
...
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for-linus
Conflicts:
fs/btrfs/ulist.h
Signed-off-by: Chris Mason <chris.mason@oracle.com>
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When we rewind REMOVE_WHILE_FREEING operations, there's code that allocates
a fresh buffer instead of cloning the old one. Setting that buffer's level
correctly was missing in this case.
When rewinding a MOVE_KEYS operation, btrfs_node_key_ptr_offset(slot) was
missing for memmove_extent_buffer()'s arguments.
Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
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Logging for del_ptr when we're not deleting the last pointer was wrong. This
fixes both, duplicate log entries and log sequence.
Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
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Replace duplicate code by small inline helper function.
Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
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tree_mod_alloc calls __get_tree_mod_seq and must acquire a spinlock before
doing so.
Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
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We must build up the inode list with the extent lock held after following
indirect refs.
This also requires an extension to ulists, which allows to modify the stored
aux value in case a key already exists in the list.
Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
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The sequence number for delayed refs is needed to postpone certain delayed
refs for a very short period while walking backrefs. Before the tree
modification log, we thought we'd only have to hold back those references
that don't have a counter operation.
While now we've the tree mod log, we're rewinding fs tree blocks to a
defined consistent state. We cannot know in advance for which tree block
we'll be doing rewind operations later. Therefore, we must postpone all the
delayed refs for fs-tree blocks, even those having a counter operation.
Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
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When a fresh transaction begins, the tree mod log must be clean. Users of
the tree modification log must ensure they never span across transaction
boundaries.
We reset the sequence to 0 in this safe situation to make absolutely sure
overflow can't happen.
Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
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Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
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This enables backref resolving on life trees while they are changing. This
is a prerequisite for quota groups and just nice to have for everything
else.
Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
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The tree modification log together with the current state of the tree gives
a consistent, old version of the tree. btrfs_search_old_slot is used to
search through this old version and return old (dummy!) extent buffers.
Naturally, this function cannot do any tree modifications.
Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
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Record all relevant modifications to block pointers in the tree mod log so
that we can rewind them later on for backref walking.
Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
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When running functions that can make changes to the internal trees
(e.g. btrfs_search_slot), we check if somebody may be interested in the
block we're currently modifying. If so, we record our modification to be
able to rewind it later on.
Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
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The tree mod log will log modifications made fs-tree nodes. Most
modifications are done by autobalance of the tree. Such changes are recorded
as long as a block entry exists. When released, the log is cleaned.
With the tree modification log, it's possible to reconstruct a consistent
old state of the tree. This is required to do backref walking on a busy
file system.
Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
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Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
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The tree modification log needs two ways to create dummy extent buffers,
once by allocating a fresh one (to rebuild an old root) and once by
cloning an existing one (to make private rewind modifications) to it.
Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
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Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
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Three callers of btrfs_free_tree_block or btrfs_alloc_tree_block passed
parameter for_cow = 1. In fact, these two functions should never mark
their tree modification operations as for_cow, because they can change
the number of blocks referenced by a tree.
Hence, we remove the extra for_cow parameter from these functions and
make them pass a zero down.
Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
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Before this patch we called find_all_leafs for a data extent, then called
find_all_roots and then looked into the extent to grab the information
we were seeking. This was done without holding the leaves locked to avoid
deadlocks. However, this can obviouly race with concurrent tree
modifications.
Instead, we now look into the extent while we're holding the lock during
find_all_leafs and store this information together with the leaf list.
Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
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The key we store with a tree block backref is only a hint. It is set when
the ref is created and can remain correct for a long time. As the tree is
rebalanced, however, eventually the key no longer points to the correct
destination.
With this patch, we change find_parent_nodes to no longer add keys unless it
knows for sure they're correct (e.g. because they're for an extent data
backref). Then when we later encounter a backref ref with no parent and no
key set, we grab the block and take the first key from the block itself.
Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
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That one has been around since the addition of backref.c. Due to the way we
calculate our slot numbers, after adding inline refs we're missing one keyed
ref unless it's located at the beginning of a new leaf.
Reported-by: Alexander Block <ablock84@googlemail.com>
Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
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ulist_next gets the pointer to the previously returned element to find the
next element from there. However, when we call ulist_add while iteration
with ulist_next is in progress (ulist explicitly supports this), we can
realloc the ulist internal memory, which makes the pointer to the previous
element useless.
Instead, we now use an iterator parameter that's independent from the
internal pointers.
Reported-by: Alexander Block <ablock84@googlemail.com>
Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
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git://git.kernel.org/pub/scm/linux/kernel/git/josef/btrfs-next into HEAD
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During unmount, it could happen that the integrity checker printed a
warning message "attempt to free ... on umount which is not yet iodone"
which turned out to be a false positive.
Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de>
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If a file_extent_item was located at the very end of a leaf and there was
not enough space to hold a full item, but there was enough space to hold
one of type BTRFS_FILE_EXTENT_INLINE or PREALLOC, and it was only such a
short item, a warning was printed anyway. This check is now fixed.
Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de>
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Reduce ioprio class of scrub readahead threads to idle priority.
This setting is fixed. This priority has shown the best performance
during all measurements.
Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de>
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So dpkg fsync()'s the file and the directory containing the file whenever it
writes to a file which is really slow in btrfs. This is partly because
fsync()'ing a directory _always_ committed the transaction instead of just
going to the tree log. This is because drop_objectid_items() would return 1
since it does a btrfs_search_slot() which returns 1. In tree-log jargon
this means that we have to commit the transaction to be safe. So just check
if ret is greater than 0 and set it to 0 if it does. With this patch we now
use the tree-log instead of committing the entire transaction, which is
twice as fast on my box. Thanks,
Signed-off-by: Josef Bacik <josef@redhat.com>
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We have this check down in the actual logging code, but this is after we
start a transaction and all that good stuff. So move the helper
inode_in_log() out so we can call it in fsync() and avoid starting a
transaction altogether and just exit if we've already fsync()'ed this file
recently. You would notice this issue if you fsync()'ed a file over and
over again until the transaction committed. Thanks,
Signed-off-by: Josef Bacik <josef@redhat.com>
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btrfs_read_buffer() has the possibility of returning the error.
Therefore, I add the code in which the return value of btrfs_read_buffer()
is checked.
Signed-off-by: Tsutomu Itoh <t-itoh@jp.fujitsu.com>
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The device statistics are written into the device tree with each
transaction commit. Only modified statistics are written.
When a filesystem is mounted, the device statistics for each involved
device are read from the device tree and used to initialize the
counters.
Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de>
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An ioctl interface is added to get the device statistic counters.
A second ioctl is added to atomically get and reset these counters.
Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de>
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The goal is to detect when drives start to get an increased error rate,
when drives should be replaced soon. Therefore statistic counters are
added that count IO errors (read, write and flush). Additionally, the
software detected errors like checksum errors and corrupted blocks are
counted.
Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de>
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1) This function is not used anywhere.
2) Using the blk_abort_queue() to abort the queue seems not correct.
blk_abort_queue() is used for timeout handling (block/blk-timeout.c).
Cc: Chris Mason <chris.mason@oracle.com>
Cc: linux-btrfs@vger.kernel.org
Cc: Jens Axboe <axboe@kernel.dk>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Asias He <asias@redhat.com>
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Two files in the different subvolumes may have the same inode id, so
The rb-tree which is used to manage the defragment object must take it
into account. This patch fix this problem.
Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
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If cow_file_range_inline fails with ENOSPC we abort the transaction which
isn't very nice. This really shouldn't be happening anyways but there's no
sense in making it a horrible error when we can easily just go allocate
normal data space for this stuff. Thanks,
Signed-off-by: Josef Bacik <josef@redhat.com>
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Ceph was hitting this race where we would remove an inode from the per-root
orphan list before we would release the space we had reserved for the inode.
We actually don't need a list or anything, we just need to make sure the
root doesn't try to free up the orphan reserve until after the inodes have
released their reservations. So use an atomic counter instead of a list on
the root and only decrement the counter after we've released our
reservation. I've tested this as well as several others and we no longer
see the warnings that you would see while running ceph. Thanks,
Btrfs: fix how we deal with the orphan block rsv
Ceph was hitting this race where we would remove an inode from the per-root
orphan list before we would release the space we had reserved for the inode.
We actually don't need a list or anything, we just need to make sure the
root doesn't try to free up the orphan reserve until after the inodes have
released their reservations. So use an atomic counter instead of a list on
the root and only decrement the counter after we've released our
reservation. I've tested this as well as several others and we no longer
see the warnings that you would see while running ceph. Thanks,
Signed-off-by: Josef Bacik <josef@redhat.com>
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Miao pointed this out while I was working on an orphan problem that messing
with a bitfield where different ranges are protected by different locks
doesn't work out right. Turns out we've been doing this forever where we
have different parts of the bit field protected by either no lock at all or
different locks which could cause all sorts of weird problems including the
issue I was hitting. So instead make a runtime_flags thing that we use the
normal bit operations on that are all atomic so we can keep having our
no/different locking for the different flags and then make force_compress
it's own thing so it can be treated normally. Thanks,
Signed-off-by: Josef Bacik <josef@redhat.com>
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When we write out the free space cache we will write out everything that is
in our in memory tree, and then we will just walk the pinned extents tree
and write anything we see there. The problem with this is that during
normal operations the pinned extents will be merged back into the free space
tree normally, and then we can allocate space from the merged areas and
commit them to the tree log. If we crash and replay the tree log we will
crash again because the tree log will try to free up space from what looks
like 2 seperate but contiguous entries, since one entry is from the original
free space cache and the other was a pinned extent that was merged back. To
fix this we just need to walk the free space tree after we load it and merge
contiguous entries back together. This will keep the tree log stuff from
breaking and it will make the allocator behave more nicely. Thanks,
Signed-off-by: Josef Bacik <josef@redhat.com>
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In normal cases, we would not be allowed to do balance in RO mode.
However, when we're using a seeding device and adding another device to sprout,
things will change:
$ mkfs.btrfs /dev/sdb7
$ btrfstune -S 1 /dev/sdb7
$ mount /dev/sdb7 /mnt/btrfs -o ro
$ btrfs fi bal /mnt/btrfs -----------------------> fail.
$ btrfs dev add /dev/sdb8 /mnt/btrfs
$ btrfs fi bal /mnt/btrfs -----------------------> works!
It should not be designed as an exception, and we'd better add another check for
mnt flags.
Signed-off-by: Liu Bo <liubo2009@cn.fujitsu.com>
Reviewed-by: Josef Bacik <josef@redhat.com>
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Fully utilize our extent state's new helper functions to use
fastpath as much as possible.
Signed-off-by: Liu Bo <liubo2009@cn.fujitsu.com>
Reviewed-by: Josef Bacik <josef@redhat.com>
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Reproduce:
$ mkfs.btrfs /dev/sdb7
$ mount /dev/sdb7 /mnt/btrfs -o ro
$ btrfs dev add /dev/sdb8 /mnt/btrfs
ERROR: error adding the device '/dev/sdb8' - Invalid argument
Since we mount with readonly options, and /dev/sdb7 is not a seeding one,
a readonly notification is preferred.
Signed-off-by: Liu Bo <liubo2009@cn.fujitsu.com>
Reviewed-by: Josef Bacik <josef@redhat.com>
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We noticed that the ordered extent completion doesn't really rely on having
a page and that it could be done independantly of ending the writeback on a
page. This patch makes us not do the threaded endio stuff for normal
buffered writes and direct writes so we can end page writeback as soon as
possible (in irq context) and only start threads to do the ordered work when
it is actually done. Compression needs to be reworked some to take
advantage of this as well, but atm it has to do a find_get_page in its endio
handler so it must be done in its own thread. This makes direct writes
quite a bit faster. Thanks,
Signed-off-by: Josef Bacik <josef@redhat.com>
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We are checking delalloc to see if it is ok to update the i_size. There are
2 cases it stops us from updating
1) If there is delalloc between our current disk_i_size and this ordered
extent
2) If there is delalloc between our current ordered extent and the next
ordered extent
These tests are racy however since we can set delalloc for these ranges at
any time. Also for the first case if we notice there is delalloc between
disk_i_size and our ordered extent we will not update disk_i_size and assume
that when that delalloc bit gets written out it will update everything
properly. However if we crash before that we will have file extents outside
of our i_size, which is not good, so this test is dangerous as well as racy.
Thanks,
Signed-off-by: Josef Bacik <josef@redhat.com>
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There is an off-by-one error: allocating room for a maximal result
string but without room for a trailing NUL. That, can lead to
returning a transformed string that is not NUL-terminated, and
then to a caller reading beyond end of the malloc'd buffer.
Rewrite to s/kzalloc/kmalloc/, remove unwarranted use of strncpy
(the result is guaranteed to fit), remove dead strlen at end, and
change a few variable names and comments.
Reviewed-by: Josef Bacik <josef@redhat.com>
Signed-off-by: Jim Meyering <meyering@redhat.com>
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A device with name of length BTRFS_DEVICE_PATH_NAME_MAX or longer
would not be NUL-terminated in the DEV_INFO ioctl result buffer.
Signed-off-by: Jim Meyering <meyering@redhat.com>
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The buffer read-overrun would be triggered by a printk format
starting with <N>, where N is a single digit. NUL-terminate
after strncpy. Use memcpy, not strncpy, since we know the
string we're copying fits in the destination buffer and
contains no NUL byte.
Signed-off-by: Jim Meyering <meyering@redhat.com>
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Address some minor type issues identified by sparse checker.
Signed-off-by: Daniel J Blueman <daniel@quora.org>
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Changing 'mount -oremount,thread_pool=2 /' didn't make any effect:
maximum amount of worker threads is specified in 2 places:
- in 'strict btrfs_fs_info::thread_pool_size'
- in each worker struct: 'struct btrfs_workers::max_workers'
'mount -oremount' updated only 'btrfs_fs_info::thread_pool_size'.
Fix it by pushing new maximum value to all created worker structures
as well.
Cc: Josef Bacik <josef@redhat.com>
Cc: Chris Mason <chris.mason@oracle.com>
Reviewed-by: Josef Bacik <josef@redhat.com>
Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>
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We already do the btrfs_wait_ordered_range which will do this for us, so
just remove this call so we don't call it twice. Thanks,
Signed-off-by: Josef Bacik <josef@redhat.com>
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