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* Merge branch 'work.misc' of ↵Linus Torvalds2016-07-281-4/+0
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs Pull vfs updates from Al Viro: "Assorted cleanups and fixes. Probably the most interesting part long-term is ->d_init() - that will have a bunch of followups in (at least) ceph and lustre, but we'll need to sort the barrier-related rules before it can get used for really non-trivial stuff. Another fun thing is the merge of ->d_iput() callers (dentry_iput() and dentry_unlink_inode()) and a bunch of ->d_compare() ones (all except the one in __d_lookup_lru())" * 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: (26 commits) fs/dcache.c: avoid soft-lockup in dput() vfs: new d_init method vfs: Update lookup_dcache() comment bdev: get rid of ->bd_inodes Remove last traces of ->sync_page new helper: d_same_name() dentry_cmp(): use lockless_dereference() instead of smp_read_barrier_depends() vfs: clean up documentation vfs: document ->d_real() vfs: merge .d_select_inode() into .d_real() unify dentry_iput() and dentry_unlink_inode() binfmt_misc: ->s_root is not going anywhere drop redundant ->owner initializations ufs: get rid of redundant checks orangefs: constify inode_operations missed comment updates from ->direct_IO() prototype change file_inode(f)->i_mapping is f->f_mapping trim fsnotify hooks a bit 9p: new helper - v9fs_parent_fid() debugfs: ->d_parent is never NULL or negative ...
| * drbd: ->d_parent is never NULL or negativeAl Viro2016-05-291-4/+0
| | | | | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* | drbd: code cleanups without semantic changesFabian Frederick2016-06-131-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This contains various cosmetic fixes ranging from simple typos to const-ifying, and using booleans properly. Original commit messages from Fabian's patch set: drbd: debugfs: constify drbd_version_fops drbd: use seq_put instead of seq_print where possible drbd: include linux/uaccess.h instead of asm/uaccess.h drbd: use const char * const for drbd strings drbd: kerneldoc warning fix in w_e_end_data_req() drbd: use unsigned for one bit fields drbd: use bool for peer is_ states drbd: fix typo drbd: use | for bitmask combination drbd: use true/false for bool drbd: fix drbd_bm_init() comments drbd: introduce peer state union drbd: fix maybe_pull_ahead() locking comments drbd: use bool for growing drbd: remove redundant declarations drbd: replace if/BUG by BUG_ON Signed-off-by: Fabian Frederick <fabf@skynet.be> Signed-off-by: Roland Kammerer <roland.kammerer@linbit.com> Signed-off-by: Jens Axboe <axboe@fb.com>
* | drbd: introduce WRITE_SAME supportLars Ellenberg2016-06-131-8/+3
|/ | | | | | | | | | | | | | | We will support WRITE_SAME, if * all peers support WRITE_SAME (both in kernel and DRBD version), * all peer devices support WRITE_SAME * logical_block_size is identical on all peers. We may at some point introduce a fallback on the receiving side for devices/kernels that do not support WRITE_SAME, by open-coding a submit loop. But not yet. Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com> Signed-off-by: Jens Axboe <axboe@fb.com>
* wrappers for ->i_mutex accessAl Viro2016-01-221-2/+2
| | | | | | | | | | | parallel to mutex_{lock,unlock,trylock,is_locked,lock_nested}, inode_foo(inode) being mutex_foo(&inode->i_mutex). Please, use those for access to ->i_mutex; over the coming cycle ->i_mutex will become rwsem, with ->lookup() done with it held only shared. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* drbd: debugfs: expose ed_data_gen_idLars Ellenberg2015-11-251-0/+10
| | | | | | | | | The effective data generation ID may be interesting for debugging purposes of scenarios involving diskless states. Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com> Signed-off-by: Jens Axboe <axboe@fb.com>
* make simple_positive() publicAl Viro2015-06-231-9/+1
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* VFS: assorted weird filesystems: d_inode() annotationsDavid Howells2015-04-151-4/+4
| | | | | Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* kill f_dentry usesAl Viro2014-11-191-3/+3
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* drbd: Remove superfluous newline from "resync_extents" debugfs entry.Philipp Marek2014-09-111-1/+1
| | | | | | | | See "drbd/resources/*/volumes/*/resync_extents". Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com> Signed-off-by: Jens Axboe <axboe@fb.com>
* drbd: debugfs: add per device data_gen_idLars Ellenberg2014-07-101-0/+22
| | | | | | | | | | The data generation identifiers used to be exposed via sysfs at /sys/block/drbdX/drbd/meta_data/data_gen_id (out-of-tree), for advanced policy scripting. Bring that information over to debugfs. Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
* drbd: debugfs: add per connection oldest requestsLars Ellenberg2014-07-101-0/+7
| | | | | | | | | | | | | Information of former /sys/block/drbdX/drbd/oldest_requests is already with higher detail in these files: debugfs/drbd/resource/$name/in_flight_summary, debugfs/drbd/resource/$name/volumes/$vnr/oldest_requests This patch adds debugfs/drbd/resource/$name/connections/peer/oldest_requests Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
* drbd: debugfs: add version tag to debugfs filesLars Ellenberg2014-07-101-0/+52
| | | | | | | | | | | | Make the first line of debugfs files a version number, starting now with "v: 0". If we change content of presentation, we will bump that. Monitoring or diagnostic scritps that may parse these files can then easily know when they need to be reviewed. Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
* drbd: debugfs: add per volume oldest_requestsLars Ellenberg2014-07-101-5/+148
| | | | | | | | | Show oldest requests * pending master bio completion and, * if different, local disk bio completion. Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
* drbd: debugfs: add callback_historyLars Ellenberg2014-07-101-0/+78
| | | | | | | | Add a per-connection worker thread callback_history with timing details, call site and callback function. Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
* drbd: debugfs: Add in_flight_summaryLars Ellenberg2014-07-101-6/+225
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * Add details about pending meta data operations to in_flight_summary. * Report number of requests waiting for activity log transactions. * timing details of peer_requests to in_flight_summary. * FLUSH details DRBD devides the incoming request stream into "epochs", in which peers are allowed to re-order writes independendly. These epochs are separated by P_BARRIER on the replication link. Such barrier packets, depending on configuration, may cause the receiving side to drain the lower level device request queues and call blkdev_issue_flush(). This is known to be an other major source of latency in DRBD. Track timing details of calls to blkdev_issue_flush(), and add them to in_flight_summary. * data socket stats To be able to diagnose bottlenecks and root causes of "slow" IO on DRBD, it is useful to see network buffer stats along with the timing details of requests, peer requests, and meta data IO. * pending bitmap IO timing details to in_flight_summary. Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
* drbd: debugfs: deal with destructor racing with open of debugfs fileLars Ellenberg2014-07-101-4/+54
| | | | | | | | | | | | | | | Try to close the race between open() and debugfs_remove_recursive() from inside an object destructor. Once open succeeds, the object should stay around. Open should not succeed if the object has already reached its destructor. This may be overkill, but to make that happen, we check for existence of a parent directory, "stale-ness" of "this" dentry, and serialize kref_get_unless_zero() on the outermost object relevant for this file with d_delete() on this dentry (using the parent's i_mutex). Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
* drbd: debugfs: add in_flight_summary dataLars Ellenberg2014-07-101-0/+196
| | | | | | | | | | | | | | | | | To help diagnosing "high latency" or "hung" IO situations on DRBD, present per drbd resource group a summary of operations currently in progress. First item is a list of oldest drbd_request objects waiting for various things: * still being prepared * waiting for activity log transaction * waiting for local disk * waiting to be sent * waiting for peer acknowledgement ("receive ack", "write ack") * waiting for peer epoch acknowledgement ("barrier ack") Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
* drbd: debugfs: add basic hierarchyLars Ellenberg2014-07-101-0/+191
Add new debugfs hierarchy /sys/kernel/debug/ drbd/ resources/ $resource_name/connections/peer/$volume_number/ $resource_name/volumes/$volume_number/ minors/$minor_number -> ../resources/$resource_name/volumes/$volume_number/ Followup commits will populate this hierarchy with files containing statistics, diagnostic information and some attribute data. Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
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