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2013-09-03NFS: Add nfs4_sequence calls for RELEASE_LOCKOWNERChuck Lever
Ensure RELEASE_LOCKOWNER is not emitted while the transport is plugged. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2013-09-03NFS: Enable nfs4_setup_sequence() for DELEGRETURNChuck Lever
When CONFIG_NFS_V4_1 is disabled, the calls to nfs4_setup_sequence() and nfs4_sequence_done() are compiled out for the DELEGRETURN operation. To allow NFSv4.0 transport blocking to work for DELEGRETURN, these call sites have to be present all the time. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2013-09-03NFS: NFSv4.0 transport blockingChuck Lever
Plumb in a mechanism for plugging an NFSv4.0 mount, using the same infrastructure as NFSv4.1 sessions. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2013-09-03NFS: Add a slot table to struct nfs_client for NFSv4.0 transport blockingChuck Lever
Anchor an nfs4_slot_table in the nfs_client for use with NFSv4.0 transport blocking. It is initialized only for NFSv4.0 nfs_client's. Introduce appropriate minor version ops to handle nfs_client initialization and shutdown requirements that differ for each minor version. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2013-09-03NFS: Add global helper for releasing slot table resourcesChuck Lever
The nfs4_destroy_slot_tables() function is renamed to avoid confusion with the new helper. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2013-09-03NFS: Add global helper to set up a stand-along nfs4_slot_tableChuck Lever
Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2013-09-03NFS: Enable slot table helpers for NFSv4.0Chuck Lever
I'd like to re-use NFSv4.1's slot table machinery for NFSv4.0 transport blocking. Re-organize some of nfs4session.c so the slot table code is built even when NFS_V4_1 is disabled. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2013-09-03NFS: Remove unused call_sync minor version opChuck Lever
Clean up. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2013-09-03NFS: Add RPC callouts to start NFSv4.0 synchronous requestsChuck Lever
Refactor nfs4_call_sync_sequence() so it is used for NFSv4.0 now. The RPC callouts will house transport blocking logic similar to NFSv4.1 sessions. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2013-09-03NFS: Common versions of sequence helper functionsChuck Lever
NFSv4.0 will have need for this functionality when I add the ability to block NFSv4.0 traffic before migration recovery. I'm not really clear on why nfs4_set_sequence_privileged() gets a generic name, but nfs41_init_sequence() gets a minor version-specific name. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2013-09-03NFS: Clean up nfs4_setup_sequence()Chuck Lever
Clean up: Both the NFSv4.0 and NFSv4.1 version of nfs4_setup_sequence() are used only in fs/nfs/nfs4proc.c. No need to keep global header declarations for either version. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2013-09-03NFS: Rename nfs41_call_sync_data as a common data structureChuck Lever
Clean up: rename nfs41_call_sync_data for use as a data structure common to all NFSv4 minor versions. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2013-09-03NFS: When displaying session slot numbers, use "%u" consistentlyChuck Lever
Clean up, since slot and sequence numbers are all unsigned anyway. Among other things, squelch compiler warnings: linux/fs/nfs/nfs4proc.c: In function ‘nfs4_setup_sequence’: linux/fs/nfs/nfs4proc.c:703:2: warning: signed and unsigned type in conditional expression [-Wsign-compare] and linux/fs/nfs/nfs4session.c: In function ‘nfs4_alloc_slot’: linux/fs/nfs/nfs4session.c:151:31: warning: signed and unsigned type in conditional expression [-Wsign-compare] Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2013-09-03NFS: Ensure that rmdir() waits for sillyrenames to completeTrond Myklebust
If an NFS client does mkdir("dir"); fd = open("dir/file"); unlink("dir/file"); close(fd); rmdir("dir"); then the asynchronous nature of the sillyrename operation means that we can end up getting EBUSY for the rmdir() in the above test. Fix that by ensuring that we wait for any in-progress sillyrenames before sending the rmdir() to the server. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2013-09-03NFSv4: use the mach cred for SECINFO w/ integrityWeston Andros Adamson
Commit 5ec16a8500d339b0e7a0cc76b785d18daad354d4 introduced a regression that causes SECINFO to fail without actualy sending an RPC if: 1) the nfs_client's rpc_client was using KRB5i/p (now tried by default) 2) the current user doesn't have valid kerberos credentials This situation is quite common - as of now a sec=sys mount would use krb5i for the nfs_client's rpc_client and a user would hardly be faulted for not having run kinit. The solution is to use the machine cred when trying to use an integrity protected auth flavor for SECINFO. Older servers may not support using the machine cred or an integrity protected auth flavor for SECINFO in every circumstance, so we fall back to using the user's cred and the filesystem's auth flavor in this case. We run into another problem when running against linux nfs servers - they return NFS4ERR_WRONGSEC when using integrity auth flavor (unless the mount is also that flavor) even though that is not a valid error for SECINFO*. Even though it's against spec, handle WRONGSEC errors on SECINFO by falling back to using the user cred and the filesystem's auth flavor. Signed-off-by: Weston Andros Adamson <dros@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2013-09-03NFS avoid expired credential keys for buffered writesAndy Adamson
We must avoid buffering a WRITE that is using a credential key (e.g. a GSS context key) that is about to expire or has expired. We currently will paint ourselves into a corner by returning success to the applciation for such a buffered WRITE, only to discover that we do not have permission when we attempt to flush the WRITE (and potentially associated COMMIT) to disk. Use the RPC layer credential key timeout and expire routines which use a a watermark, gss_key_expire_timeo. We test the key in nfs_file_write. If a WRITE is using a credential with a key that will expire within watermark seconds, flush the inode in nfs_write_end and send only NFS_FILE_SYNC WRITEs by adding nfs_ctx_key_to_expire to nfs_need_sync_write. Note that this results in single page NFS_FILE_SYNC WRITEs. Signed-off-by: Andy Adamson <andros@netapp.com> [Trond: removed a pr_warn_ratelimited() for now] Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2013-09-03Merge tag 'driver-core-3.12-rc1' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core Pull driver core patches from Greg KH: "Here's the big driver core pull request for 3.12-rc1. Lots of tiny changes here fixing up the way sysfs attributes are created, to try to make drivers simpler, and fix a whole class race conditions with creations of device attributes after the device was announced to userspace. All the various pieces are acked by the different subsystem maintainers" * tag 'driver-core-3.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core: (119 commits) firmware loader: fix pending_fw_head list corruption drivers/base/memory.c: introduce help macro to_memory_block dynamic debug: line queries failing due to uninitialized local variable sysfs: sysfs_create_groups returns a value. debugfs: provide debugfs_create_x64() when disabled rbd: convert bus code to use bus_groups firmware: dcdbas: use binary attribute groups sysfs: add sysfs_create/remove_groups for when SYSFS is not enabled driver core: add #include <linux/sysfs.h> to core files. HID: convert bus code to use dev_groups Input: serio: convert bus code to use drv_groups Input: gameport: convert bus code to use drv_groups driver core: firmware: use __ATTR_RW() driver core: core: use DEVICE_ATTR_RO driver core: bus: use DRIVER_ATTR_WO() driver core: create write-only attribute macros for devices and drivers sysfs: create __ATTR_WO() driver-core: platform: convert bus code to use dev_groups workqueue: convert bus code to use dev_groups MEI: convert bus code to use dev_groups ...
2013-09-03Merge branch 'lockref' (locked reference counts)Linus Torvalds
Merge lockref infrastructure code by me and Waiman Long. I already merged some of the preparatory patches that didn't actually do any semantic changes earlier, but this merges the actual _reason_ for those preparatory patches. The "lockref" structure is a combination "spinlock and reference count" that allows optimized reference count accesses. In particular, it guarantees that the reference count will be updated AS IF the spinlock was held, but using atomic accesses that cover both the reference count and the spinlock words, we can often do the update without actually having to take the lock. This allows us to avoid the nastiest cases of spinlock contention on large machines under heavy pathname lookup loads. When updating the dentry reference counts on a large system, we'll still end up with the cache line bouncing around, but that's much less noticeable than actually having to spin waiting for the lock. * lockref: lockref: implement lockless reference count updates using cmpxchg() lockref: uninline lockref helper functions vfs: reimplement d_rcu_to_refcount() using lockref_get_or_lock() vfs: use lockref_get_not_zero() for optimistic lockless dget_parent() lockref: add 'lockref_get_or_lock() helper
2013-09-03fuse: readdir: check for slash in namesMiklos Szeredi
Userspace can add names containing a slash character to the directory listing. Don't allow this as it could cause all sorts of trouble. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Cc: stable@vger.kernel.org
2013-09-03fuse: hotfix truncate_pagecache() issueMaxim Patlasov
The way how fuse calls truncate_pagecache() from fuse_change_attributes() is completely wrong. Because, w/o i_mutex held, we never sure whether 'oldsize' and 'attr->size' are valid by the time of execution of truncate_pagecache(inode, oldsize, attr->size). In fact, as soon as we released fc->lock in the middle of fuse_change_attributes(), we completely loose control of actions which may happen with given inode until we reach truncate_pagecache. The list of potentially dangerous actions includes mmap-ed reads and writes, ftruncate(2) and write(2) extending file size. The typical outcome of doing truncate_pagecache() with outdated arguments is data corruption from user point of view. This is (in some sense) acceptable in cases when the issue is triggered by a change of the file on the server (i.e. externally wrt fuse operation), but it is absolutely intolerable in scenarios when a single fuse client modifies a file without any external intervention. A real life case I discovered by fsx-linux looked like this: 1. Shrinking ftruncate(2) comes to fuse_do_setattr(). The latter sends FUSE_SETATTR to the server synchronously, but before getting fc->lock ... 2. fuse_dentry_revalidate() is asynchronously called. It sends FUSE_LOOKUP to the server synchronously, then calls fuse_change_attributes(). The latter updates i_size, releases fc->lock, but before comparing oldsize vs attr->size.. 3. fuse_do_setattr() from the first step proceeds by acquiring fc->lock and updating attributes and i_size, but now oldsize is equal to outarg.attr.size because i_size has just been updated (step 2). Hence, fuse_do_setattr() returns w/o calling truncate_pagecache(). 4. As soon as ftruncate(2) completes, the user extends file size by write(2) making a hole in the middle of file, then reads data from the hole either by read(2) or mmap-ed read. The user expects to get zero data from the hole, but gets stale data because truncate_pagecache() is not executed yet. The scenario above illustrates one side of the problem: not truncating the page cache even though we should. Another side corresponds to truncating page cache too late, when the state of inode changed significantly. Theoretically, the following is possible: 1. As in the previous scenario fuse_dentry_revalidate() discovered that i_size changed (due to our own fuse_do_setattr()) and is going to call truncate_pagecache() for some 'new_size' it believes valid right now. But by the time that particular truncate_pagecache() is called ... 2. fuse_do_setattr() returns (either having called truncate_pagecache() or not -- it doesn't matter). 3. The file is extended either by write(2) or ftruncate(2) or fallocate(2). 4. mmap-ed write makes a page in the extended region dirty. The result will be the lost of data user wrote on the fourth step. The patch is a hotfix resolving the issue in a simplistic way: let's skip dangerous i_size update and truncate_pagecache if an operation changing file size is in progress. This simplistic approach looks correct for the cases w/o external changes. And to handle them properly, more sophisticated and intrusive techniques (e.g. NFS-like one) would be required. I'd like to postpone it until the issue is well discussed on the mailing list(s). Changed in v2: - improved patch description to cover both sides of the issue. Signed-off-by: Maxim Patlasov <mpatlasov@parallels.com> Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Cc: stable@vger.kernel.org
2013-09-03fuse: invalidate inode attributes on xattr modificationAnand Avati
Calls like setxattr and removexattr result in updation of ctime. Therefore invalidate inode attributes to force a refresh. Signed-off-by: Anand Avati <avati@redhat.com> Reviewed-by: Brian Foster <bfoster@redhat.com> Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Cc: stable@vger.kernel.org
2013-09-03fuse: postpone end_page_writeback() in fuse_writepage_locked()Maxim Patlasov
The patch fixes a race between ftruncate(2), mmap-ed write and write(2): 1) An user makes a page dirty via mmap-ed write. 2) The user performs shrinking truncate(2) intended to purge the page. 3) Before fuse_do_setattr calls truncate_pagecache, the page goes to writeback. fuse_writepage_locked fills FUSE_WRITE request and releases the original page by end_page_writeback. 4) fuse_do_setattr() completes and successfully returns. Since now, i_mutex is free. 5) Ordinary write(2) extends i_size back to cover the page. Note that fuse_send_write_pages do wait for fuse writeback, but for another page->index. 6) fuse_writepage_locked proceeds by queueing FUSE_WRITE request. fuse_send_writepage is supposed to crop inarg->size of the request, but it doesn't because i_size has already been extended back. Moving end_page_writeback to the end of fuse_writepage_locked fixes the race because now the fact that truncate_pagecache is successfully returned infers that fuse_writepage_locked has already called end_page_writeback. And this, in turn, infers that fuse_flush_writepages has already called fuse_send_writepage, and the latter used valid (shrunk) i_size. write(2) could not extend it because of i_mutex held by ftruncate(2). Signed-off-by: Maxim Patlasov <mpatlasov@parallels.com> Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Cc: stable@vger.kernel.org
2013-09-03f2fs: avoid an overflow during utilization calculationJaegeuk Kim
The current f2fs uses all the block counts with 32 bit numbers, which is able to cover about 15TB volume. But in calculation of utilization, f2fs multiplies the count by 100 which can induce overflow. This patch fixes this. Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
2013-09-03f2fs: trigger GC when there are prefree segmentsJaegeuk Kim
Previously, f2fs conducts SSR when free_sections() < overprovision_sections. But, even though there are a lot of prefree segments, it can consider SSR only. So, let's consider the number of prefree segments too for triggering SSR. Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
2013-09-02vfs: reimplement d_rcu_to_refcount() using lockref_get_or_lock()Linus Torvalds
This moves __d_rcu_to_refcount() from <linux/dcache.h> into fs/namei.c and re-implements it using the lockref infrastructure instead. It also adds a lot of comments about what is actually going on, because turning a dentry that was looked up using RCU into a long-lived reference counted entry is one of the more subtle parts of the rcu walk. We also used to be _particularly_ subtle in unlazy_walk() where we re-validate both the dentry and its parent using the same sequence count. We used to do it by nesting the locks and then verifying the sequence count just once. That was silly, because nested locking is expensive, but the sequence count check is not. So this just re-validates the dentry and the parent separately, avoiding the nested locking, and making the lockref lookup possible. Acked-by: Waiman Long <waiman.long@hp.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-09-02vfs: use lockref_get_not_zero() for optimistic lockless dget_parent()Waiman Long
A valid parent pointer is always going to have a non-zero reference count, but if we look up the parent optimistically without locking, we have to protect against the (very unlikely) race against renaming changing the parent from under us. We do that by using lockref_get_not_zero(), and then re-checking the parent pointer after getting a valid reference. [ This is a re-implementation of a chunk from the original patch by Waiman Long: "dcache: Enable lockless update of dentry's refcount". I've completely rewritten the patch-series and split it up, but I'm attributing this part to Waiman as it's close enough to his earlier patch - Linus ] Signed-off-by: Waiman Long <Waiman.Long@hp.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-09-01NFSv4: Convert idmapper to use the new framework for pipefs dentriesTrond Myklebust
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2013-09-01Btrfs: optimize key searches in btrfs_search_slotFilipe David Borba Manana
When the binary search returns 0 (exact match), the target key will necessarily be at slot 0 of all nodes below the current one, so in this case the binary search is not needed because it will always return 0, and we waste time doing it, holding node locks for longer than necessary, etc. Below follow histograms with the times spent on the current approach of doing a binary search when the previous binary search returned 0, and times for the new approach, which directly picks the first item/child node in the leaf/node. Current approach: Count: 6682 Range: 35.000 - 8370.000; Mean: 85.837; Median: 75.000; Stddev: 106.429 Percentiles: 90th: 124.000; 95th: 145.000; 99th: 206.000 35.000 - 61.080: 1235 ################ 61.080 - 106.053: 4207 ##################################################### 106.053 - 183.606: 1122 ############## 183.606 - 317.341: 111 # 317.341 - 547.959: 6 | 547.959 - 8370.000: 1 | Approach proposed by this patch: Count: 6682 Range: 6.000 - 135.000; Mean: 16.690; Median: 16.000; Stddev: 7.160 Percentiles: 90th: 23.000; 95th: 27.000; 99th: 40.000 6.000 - 8.418: 58 # 8.418 - 11.670: 1149 ######################### 11.670 - 16.046: 2418 ##################################################### 16.046 - 21.934: 2098 ############################################## 21.934 - 29.854: 744 ################ 29.854 - 40.511: 154 ### 40.511 - 54.848: 41 # 54.848 - 74.136: 5 | 74.136 - 100.087: 9 | 100.087 - 135.000: 6 | These samples were captured during a run of the btrfs tests 001, 002 and 004 in the xfstests, with a leaf/node size of 4Kb. Signed-off-by: Filipe David Borba Manana <fdmanana@gmail.com> Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
2013-09-01Btrfs: don't use an async starter for most of our workersJosef Bacik
We only need an async starter if we can't make a GFP_NOFS allocation in our current path. This is the case for the endio stuff since it happens in IRQ context, but things like the caching thread workers and the delalloc flushers we can easily make this allocation and start threads right away. Also change the worker count for the caching thread pool. Traditionally we limited this to 2 since we took read locks while caching, but nowadays we do this lockless so there's no reason to limit the number of caching threads. Thanks, Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
2013-09-01Btrfs: only update disk_i_size as we remove extentsJosef Bacik
This fixes a problem where if we fail a truncate we will leave the i_size set where we wanted to truncate to instead of where we were able to truncate to. Fix this by making btrfs_truncate_inode_items do the disk_i_size update as it removes extents, that way it will always be consistent with where its extents are. Then if the truncate fails at all we can update the in-ram i_size with what we have on disk and delete the orphan item. Thanks, Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
2013-09-01Btrfs: fix deadlock in uuid scan kthreadFilipe David Borba Manana
If there's an ongoing transaction when the uuid scan kthread attempts to create one, the kthread will block, waiting for that transaction to finish while it's keeping locks on the tree root, and in turn the existing transaction is waiting for those locks to be free. The stack trace reported by the kernel follows. [36700.671601] INFO: task btrfs-uuid:15480 blocked for more than 120 seconds. [36700.671602] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [36700.671602] btrfs-uuid D 0000000000000000 0 15480 2 0x00000000 [36700.671604] ffff880710bd5b88 0000000000000046 ffff8803d36ba850 0000000000030000 [36700.671605] ffff8806d76dc530 ffff880710bd5fd8 ffff880710bd5fd8 ffff880710bd5fd8 [36700.671607] ffff8808098ac530 ffff8806d76dc530 ffff880710bd5b98 ffff8805e4508e40 [36700.671608] Call Trace: [36700.671610] [<ffffffff816f36b9>] schedule+0x29/0x70 [36700.671620] [<ffffffffa05a3bdf>] wait_current_trans.isra.33+0xbf/0x120 [btrfs] [36700.671623] [<ffffffff81066760>] ? add_wait_queue+0x60/0x60 [36700.671629] [<ffffffffa05a5b06>] start_transaction+0x3d6/0x530 [btrfs] [36700.671636] [<ffffffffa05bb1f4>] ? btrfs_get_token_32+0x64/0xf0 [btrfs] [36700.671642] [<ffffffffa05a5fbb>] btrfs_start_transaction+0x1b/0x20 [btrfs] [36700.671649] [<ffffffffa05c8a81>] btrfs_uuid_scan_kthread+0x211/0x3d0 [btrfs] [36700.671655] [<ffffffffa05c8870>] ? __btrfs_open_devices+0x2a0/0x2a0 [btrfs] [36700.671657] [<ffffffff81065fa0>] kthread+0xc0/0xd0 [36700.671659] [<ffffffff81065ee0>] ? flush_kthread_worker+0xb0/0xb0 [36700.671661] [<ffffffff816fcd1c>] ret_from_fork+0x7c/0xb0 [36700.671662] [<ffffffff81065ee0>] ? flush_kthread_worker+0xb0/0xb0 [36700.671663] INFO: task btrfs:15481 blocked for more than 120 seconds. [36700.671664] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [36700.671665] btrfs D 0000000000000000 0 15481 15212 0x00000004 [36700.671666] ffff880248cbf4c8 0000000000000086 ffff8803d36ba700 ffff8801dbd5c280 [36700.671668] ffff880807815c40 ffff880248cbffd8 ffff880248cbffd8 ffff880248cbffd8 [36700.671669] ffff8805e86a0000 ffff880807815c40 ffff880248cbf4d8 ffff8801dbd5c280 [36700.671670] Call Trace: [36700.671672] [<ffffffff816f36b9>] schedule+0x29/0x70 [36700.671679] [<ffffffffa05d9b0d>] btrfs_tree_lock+0x6d/0x230 [btrfs] [36700.671680] [<ffffffff81066760>] ? add_wait_queue+0x60/0x60 [36700.671685] [<ffffffffa0582829>] btrfs_search_slot+0x999/0xb00 [btrfs] [36700.671691] [<ffffffffa05bd9de>] ? btrfs_lookup_first_ordered_extent+0x5e/0xb0 [btrfs] [36700.671698] [<ffffffffa05e3e54>] __btrfs_write_out_cache+0x8c4/0xa80 [btrfs] [36700.671704] [<ffffffffa05e4362>] btrfs_write_out_cache+0xb2/0xf0 [btrfs] [36700.671710] [<ffffffffa05c4441>] ? free_extent_buffer+0x61/0xc0 [btrfs] [36700.671716] [<ffffffffa0594c82>] btrfs_write_dirty_block_groups+0x562/0x650 [btrfs] [36700.671723] [<ffffffffa0610092>] commit_cowonly_roots+0x171/0x24b [btrfs] [36700.671729] [<ffffffffa05a4dde>] btrfs_commit_transaction+0x4fe/0xa10 [btrfs] [36700.671735] [<ffffffffa0610af3>] create_subvol+0x5c0/0x636 [btrfs] [36700.671742] [<ffffffffa05d49ff>] btrfs_mksubvol.isra.60+0x33f/0x3f0 [btrfs] [36700.671747] [<ffffffffa05d4bf2>] btrfs_ioctl_snap_create_transid+0x142/0x190 [btrfs] [36700.671752] [<ffffffffa05d4c6c>] ? btrfs_ioctl_snap_create+0x2c/0x80 [btrfs] [36700.671757] [<ffffffffa05d4c9e>] btrfs_ioctl_snap_create+0x5e/0x80 [btrfs] [36700.671759] [<ffffffff8113a764>] ? handle_pte_fault+0x84/0x920 [36700.671764] [<ffffffffa05d87eb>] btrfs_ioctl+0xf0b/0x1d00 [btrfs] [36700.671766] [<ffffffff8113c120>] ? handle_mm_fault+0x210/0x310 [36700.671768] [<ffffffff816f83a4>] ? __do_page_fault+0x284/0x4e0 [36700.671770] [<ffffffff81180aa6>] do_vfs_ioctl+0x96/0x550 [36700.671772] [<ffffffff81170fe3>] ? __sb_end_write+0x33/0x70 [36700.671774] [<ffffffff81180ff1>] SyS_ioctl+0x91/0xb0 [36700.671775] [<ffffffff816fcdc2>] system_call_fastpath+0x16/0x1b Signed-off-by: Filipe David Borba Manana <fdmanana@gmail.com> Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
2013-09-01Btrfs: stop refusing the relocation of chunk 0Ilya Dryomov
AFAICT chunk 0 is no longer special, and so it should be restriped just like every other chunk. One reason for this change is us refusing the relocation can lead to filesystems that can only be mounted ro, and never rw -- see the bugzilla [1] for details. The other reason is that device removal code is already doing this: it will happily relocate chunk 0 is part of shrinking the device. [1] https://bugzilla.kernel.org/show_bug.cgi?id=60594 Reported-by: Xavier Bassery <xavier@bartica.org> Signed-off-by: Ilya Dryomov <idryomov@gmail.com> Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
2013-09-01Btrfs: fix memory leak of uuid_root in free_fs_infoFilipe David Borba Manana
Signed-off-by: Filipe David Borba Manana <fdmanana@gmail.com> Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
2013-09-01btrfs: reuse kbasename helperAndy Shevchenko
To get name of the file from a pathname let's use kbasename() helper. It allows to simplify code a bit. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
2013-09-01btrfs: return btrfs error code for dev excl ops errAnand Jain
now threads can return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS as defined in btrfs.h for the dev excl operation error in the FS, which means with this kernel would stop logging (almost an user error) into the /var/log/messages v2: accepts Josef' comment Signed-off-by: Anand Jain <anand.jain@oracle.com> Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
2013-09-01Btrfs: allow partial ordered extent completionJosef Bacik
We currently have this problem where you can truncate pages that have not yet been written for an ordered extent. We do this because the truncate will be coming behind to clean us up anyway so what's the harm right? Well if truncate fails for whatever reason we leave an orphan item around for the file to be cleaned up later. But if the user goes and truncates up the file and tries to read from the area that had been discarded previously they will get a csum error because we never actually wrote that data out. This patch fixes this by allowing us to either discard the ordered extent completely, by which I mean we just free up the space we had allocated and not add the file extent, or adjust the length of the file extent we write. We do this by setting the length we truncated down to in the ordered extent, and then we set the file extent length and ram bytes to this length. The total disk space stays unchanged since we may be compressed and we can't just chop off the disk space, but at least this way the file extent only points to the valid data. Then when the file extent is free'd the extent and csums will be freed normally. This patch is needed for the next series which will give us more graceful recovery of failed truncates. Thanks, Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
2013-09-01Btrfs: convert all bug_ons in free-space-cache.cJosef Bacik
All of these are logic checks to make sure we're not breaking anything, so convert them over to ASSERT(). Thanks, Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
2013-09-01Btrfs: add support for assertsJosef Bacik
One of the complaints we get a lot is how many BUG_ON()'s we have. So to help with this I'm introducing a kconfig option to enable/disable a new ASSERT() mechanism much like what XFS does. This will allow us developers to still get our nice panics but allow users/distros to compile them out. With this we can go through and convert any BUG_ON()'s that we have to catch actual programming mistakes to the new ASSERT() and then fix everybody else to return errors. This will also allow developers to leave sanity checks in their new code to make sure we don't trip over problems while testing stuff and vetting new features. Thanks, Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
2013-09-01Btrfs: adjust the fs_devices->missing count on unmountJosef Bacik
I noticed that if I tried to mount a file system with -o degraded after having done it once already we would fail to mount. This is because the fs_devices->missing count was getting bumped everytime we mounted, but not getting reset whenever we unmounted. To fix this we just drop the missing count as we're closing devices to make sure this doesn't happen. Thanks, Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
2013-09-01Btrf: cleanup: don't check for root_refs == 0 twiceStefan Behrens
btrfs_read_fs_root_no_name() already checks if btrfs_root_refs() is zero and returns ENOENT in this case. There is no need to do it again in three more places. Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de> Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
2013-09-01Btrfs: fix for patch "cleanup: don't check the same thing twice"Stefan Behrens
Mitch Harder noticed that the patch 3c64a1a mentioned in the subject line was causing a kernel BUG() on snapshot deletion. The patch was wrong. It did not handle cached roots correctly. The check for root_refs == 0 was removed everywhere where btrfs_read_fs_root_no_name() had been used to retrieve the root, because this check was already dealt with in btrfs_read_fs_root_no_name(). But in the case when the root was found in the cache, there was no such check. This patch adds the missing check in the case where the root is found in the cache. Reported-by: Mitch Harder <mitch.harder@sabayonlinux.org> Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de> Reviewed-by: Miao Xie <miaox@cn.fujitsu.com> Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
2013-09-01Btrfs: get rid of one BUG() in write_all_supers()Stefan Behrens
The second round uses btrfs_error() and return -EIO, the first round can handle write errors the same way. Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de> Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
2013-09-01Btrfs: allocate prelim_ref with a slab allocaterWang Shilong
struct __prelim_ref is allocated and freed frequently when walking backref tree, using slab allocater can not only speed up allocating but also detect memory leaks. Signed-off-by: Wang Shilong <wangsl.fnst@cn.fujitsu.com> Reviewed-by: Miao Xie <miaox@cn.fujitsu.com> Reviewed-by: Jan Schmidt <list.btrfs@jan-o-sch.net> Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
2013-09-01Btrfs: pass gfp_t to __add_prelim_ref() to avoid always using GFP_ATOMICWang Shilong
Currently, only add_delayed_refs have to allocate with GFP_ATOMIC, So just pass arg 'gfp_t' to decide which allocation mode. Signed-off-by: Wang Shilong <wangsl.fnst@cn.fujitsu.com> Reviewed-by: Miao Xie <miaox@cn.fujitsu.com> Reviewed-by: Jan Schmidt <list.btrfs@jan-o-sch.net> Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
2013-09-01Btrfs: fix race conditions in BTRFS_IOC_FS_INFO ioctlFilipe David Borba Manana
The handler for the ioctl BTRFS_IOC_FS_INFO was reading the number of devices before acquiring the device list mutex. This could lead to inconsistent results because the update of the device list and the number of devices counter (amongst other counters related to the device list) are updated in volumes.c while holding the device list mutex - except for 2 places, one was volumes.c:btrfs_prepare_sprout() and the other was volumes.c:device_list_add(). For example, if we have 2 devices, with IDs 1 and 2 and then add a new device, with ID 3, and while adding the device is in progress an BTRFS_IOC_FS_INFO ioctl arrives, it could return a number of devices of 2 and a max dev id of 3. This would be incorrect. Also, this ioctl handler was reading the fsid while it can be updated concurrently. This can happen when while a new device is being added and the current filesystem is in seeding mode. Example: $ mkfs.btrfs -f /dev/sdb1 $ mkfs.btrfs -f /dev/sdb2 $ btrfstune -S 1 /dev/sdb1 $ mount /dev/sdb1 /mnt/test $ btrfs device add /dev/sdb2 /mnt/test If during the last step a BTRFS_IOC_FS_INFO ioctl was requested, it could read an fsid that was never valid (some bits part of the old fsid and others part of the new fsid). Also, it could read a number of devices that doesn't match the number of devices in the list and the max device id, as explained before. Signed-off-by: Filipe David Borba Manana <fdmanana@gmail.com> Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
2013-09-01Btrfs: fix race between removing a dev and writing sbsFilipe David Borba Manana
This change fixes an issue when removing a device and writing all super blocks run simultaneously. Here's the steps necessary for the issue to happen: 1) disk-io.c:write_all_supers() gets a number of N devices from the super_copy, so it will not panic if it fails to write super blocks for N - 1 devices; 2) Then it tries to acquire the device_list_mutex, but blocks because volumes.c:btrfs_rm_device() got it first; 3) btrfs_rm_device() removes the device from the list, then unlocks the mutex and after the unlock it updates the number of devices in super_copy to N - 1. 4) write_all_supers() finally acquires the mutex, iterates over all the devices in the list and gets N - 1 errors, that is, it failed to write super blocks to all the devices; 5) Because write_all_supers() thinks there are a total of N devices, it considers N - 1 errors to be ok, and therefore won't panic. So this change just makes sure that write_all_supers() reads the number of devices from super_copy after it acquires the device_list_mutex. Conversely, it changes btrfs_rm_device() to update the number of devices in super_copy before it releases the device list mutex. The code path to add a new device (volumes.c:btrfs_init_new_device), already has the right behaviour: it updates the number of devices in super_copy while holding the device_list_mutex. The only code path that doesn't lock the device list mutex before updating the number of devices in the super copy is disk-io.c:next_root_backup(), called by open_ctree() during mount time where concurrency issues can't happen. Signed-off-by: Filipe David Borba Manana <fdmanana@gmail.com> Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
2013-09-01Btrfs: remove ourselves from the cluster list under lockJosef Bacik
A user was reporting weird warnings from btrfs_put_delayed_ref() and I noticed that we were doing this list_del_init() on our head ref outside of delayed_refs->lock. This is a problem if we have people still on the list, we could end up modifying old pointers and such. Fix this by removing us from the list before we do our run_delayed_ref on our head ref. Thanks, Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
2013-09-01Btrfs: do not clear our orphan item runtime flag on eexistJosef Bacik
We were unconditionally clearing our runtime flag on the inode on error when trying to insert an orphan item. This is wrong in the case of -EEXIST since we obviously have an orphan item. This was causing us to not do the correct cleanup of our orphan items which caused issues on cleanup. This happens because currently when truncate fails we just leave the orphan item on there so it can be cleaned up, so if we go to remove the file later we will hit this issue. What we do for truncate isn't right either, but we shouldn't screw this sort of thing up on error either, so fix this and then I'll fix truncate in a different patch. Thanks, Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
2013-09-01Btrfs: fix send to deal with sparse files properlyJosef Bacik
Send was just sending everything it found, even if the extent was a hole. This is unpleasant for users, so just skip holes when we are sending. This will also skip sending prealloc extents since the send spec doesn't have a prealloc command. Eventually we will add a prealloc command and rev the send version so we can send down the prealloc info. Thanks, Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
2013-09-01Btrfs: fix printing of non NULL terminated stringFilipe David Borba Manana
The name buffer is not terminated by a '\0' character, therefore it needs to be printed with %.*s and use the length of the buffer. Signed-off-by: Filipe David Borba Manana <fdmanana@gmail.com> Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>