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* Btrfs: add the missing mutex unlock in write_all_supers()Stefan Behrens2013-09-211-0/+1
| | | | | | | | | | | | | | | The BUG() was replaced by btrfs_error() and return -EIO with the patch "get rid of one BUG() in write_all_supers()", but the missing mutex_unlock() was overlooked. The 0-DAY kernel build service from Intel reported the missing unlock which was found by the coccinelle tool: fs/btrfs/disk-io.c:3422:2-8: preceding lock on line 3374 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>
* Btrfs: iput inode on allocation failureJosef Bacik2013-09-211-0/+4
| | | | | | | | We don't do the iput when we fail to allocate our delayed delalloc work in __start_delalloc_inodes, fix this. Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
* Btrfs: remove space_info->reservation_progressJosef Bacik2013-09-212-12/+0
| | | | | | | This isn't used for anything anymore, just remove it. Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
* Btrfs: kill delay_iput arg to the wait_ordered functionsJosef Bacik2013-09-218-33/+14
| | | | | | | | | | | This is a left over of how we used to wait for ordered extents, which was to grab the inode and then run filemap flush on it. However if we have an ordered extent then we already are holding a ref on the inode, and we just use btrfs_start_ordered_extent anyway, so there is no reason to have an extra ref on the inode to start work on the ordered extent. Thanks, Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
* Btrfs: fix worst case calculator for space usageJosef Bacik2013-09-211-1/+1
| | | | | | | | | | Forever ago I made the worst case calculator say that we could potentially split into 3 blocks for every level on the way down, which isn't right. If we split we're only going to get two new blocks, the one we originally cow'ed and the new one we're going to split. Thanks, Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
* Revert "Btrfs: rework the overcommit logic to be based on the total size"Josef Bacik2013-09-211-12/+3
| | | | | | | | | | This reverts commit 70afa3998c9baed4186df38988246de1abdab56d. It is causing performance issues and wasn't actually correct. There were problems with the way we flushed delalloc and that was the real cause of the early enospc. Thanks, Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
* Btrfs: improve replacing nocow extentsJosef Bacik2013-09-211-14/+98
| | | | | | | | | | | | | | | | Various people have hit a deadlock when running btrfs/011. This is because when replacing nocow extents we will take the i_mutex to make sure nobody messes with the file while we are replacing the extent. The problem is we are already holding a transaction open, which is a locking inversion, so instead we need to save these inodes we find and then process them outside of the transaction. Further we can't just lock the inode and assume we are good to go. We need to lock the extent range and then read back the extent cache for the inode to make sure the extent really still points at the physical block we want. If it doesn't we don't have to copy it. Thanks, Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
* Btrfs: drop dir i_size when adding new names on replayJosef Bacik2013-09-211-0/+27
| | | | | | | | | | | | | So if we have dir_index items in the log that means we also have the inode item as well, which means that the inode's i_size is correct. However when we process dir_index'es we call btrfs_add_link() which will increase the directory's i_size for the new entry. To fix this we need to just set the dir items i_size to 0, and then as we find dir_index items we adjust the i_size. btrfs_add_link() will do it for new entries, and if the entry already exists we can just add the name_len to the i_size ourselves. Thanks, Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
* Btrfs: replay dir_index items before other itemsJosef Bacik2013-09-211-3/+12
| | | | | | | | | | | | | | | | A user reported a bug where his log would not replay because he was getting -EEXIST back. This was because he had a file moved into a directory that was logged. What happens is the file had a lower inode number, and so it is processed first when replaying the log, and so we add the inode ref in for the directory it was moved to. But then we process the directories DIR_INDEX item and try to add the inode ref for that inode and it fails because we already added it when we replayed the inode. To solve this problem we need to just process any DIR_INDEX items we have in the log first so this all is taken care of, and then we can replay the rest of the items. With this patch my reproducer can remount the file system properly instead of erroring out. Thanks, Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
* Btrfs: check roots last log commit when checking if an inode has been loggedJosef Bacik2013-09-211-1/+4
| | | | | | | | | | | | | | | | | | Liu introduced a local copy of the last log commit for an inode to make sure we actually log an inode even if a log commit has already taken place. In order to make sure we didn't relog the same inode multiple times he set this local copy to the current trans when we log the inode, because usually we log the inode and then sync the log. The exception to this is during rename, we will relog an inode if the name changed and it is already in the log. The problem with this is then we go to sync the inode, and our check to see if the inode has already been logged is tripped and we don't sync the log. To fix this we need to _also_ check against the roots last log commit, because it could be less than what is in our local copy of the log commit. This fixes a bug where we rename a file into a directory and then fsync the directory and then on remount the directory is no longer there. Thanks, Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
* Btrfs: actually log directory we are fsync()'ingJosef Bacik2013-09-211-1/+9
| | | | | | | | | | | | | If you just create a directory and then fsync that directory and then pull the power plug you will come back up and the directory will not be there. That is because we won't actually create directories if we've logged files inside of them since they will be created on replay, but in this check we will set our logged_trans of our current directory if it happens to be a directory, making us think it doesn't need to be logged. Fix the logic to only do this to parent directories. Thanks, Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
* Btrfs: actually limit the size of delalloc rangeJosef Bacik2013-09-211-3/+5
| | | | | | | | | | | | | | | | | | So forever we have had this thing to limit the amount of delalloc pages we'll setup to be written out to 128mb. This is because we have to lock all the pages in this range, so anything above this gets a bit unweildly, and also without a limit we'll happily allocate gigantic chunks of disk space. Turns out our check for this wasn't quite right, we wouldn't actually limit the chunk we wanted to write out, we'd just stop looking for more space after we went over the limit. So if you do a giant 20gb dd on my box with lots of ram I could get 2gig extents. This is fine normally, except when you go to relocate these extents and we can't find enough space to relocate these moster extents, since we have to be able to allocate exactly the same sized extent to move it around. So fix this by actually enforcing the limit. With this patch I'm no longer seeing giant 1.5gb extents. Thanks, Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
* Btrfs: allocate the free space by the existed max extent size when ENOSPCMiao Xie2013-09-213-31/+74
| | | | | | | | | | | | | | | | | | | | | | | | | | | | By the current code, if the requested size is very large, and all the extents in the free space cache are small, we will waste lots of the cpu time to cut the requested size in half and search the cache again and again until it gets down to the size the allocator can return. In fact, we can know the max extent size in the cache after the first search, so we needn't cut the size in half repeatedly, and just use the max extent size directly. This way can save lots of cpu time and make the performance grow up when there are only fragments in the free space cache. According to my test, if there are only 4KB free space extents in the fs, and the total size of those extents are 256MB, we can reduce the execute time of the following test from 5.4s to 1.4s. dd if=/dev/zero of=<testfile> bs=1MB count=1 oflag=sync Changelog v2 -> v3: - fix the problem that we skip the block group with the space which is less than we need. Changelog v1 -> v2: - address the problem that we return a wrong start position when searching the free space in a bitmap. Signed-off-by: Miao Xie <miaox@cn.fujitsu.com> Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
* btrfs: add lockdep and tracing annotations for uuid treeDavid Sterba2013-09-211-0/+1
| | | | | | Signed-off-by: David Sterba <dsterba@suse.cz> Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
* btrfs: show compiled-in config features at module load timeStefan Behrens2013-09-211-0/+3
| | | | | | | | | | | | | We want to know if there are debugging features compiled in, this may affect performance. The message is printed before the sanity checks. (This commit message is a copy of David Sterba's commit message when he introduced btrfs_print_info()). Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de> Reviewed-by: David Sterba <dsterba@suse.cz> Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
* Btrfs: more efficient inode tree replace operationFilipe David Borba Manana2013-09-211-5/+5
| | | | | | | | | | | Instead of removing the current inode from the red black tree and then add the new one, just use the red black tree replace operation, which is more efficient. Signed-off-by: Filipe David Borba Manana <fdmanana@gmail.com> Reviewed-by: Zach Brown <zab@redhat.com> Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
* Btrfs: do not add replace target to the alloc_listIlya Dryomov2013-09-211-1/+2
| | | | | | | | | | | | | | | | If replace was suspended by the umount, replace target device is added to the fs_devices->alloc_list during a later mount. This is obviously wrong. ->is_tgtdev_for_dev_replace is supposed to guard against that, but ->is_tgtdev_for_dev_replace is (and can only ever be) initialized *after* everything is opened and fs_devices lists are populated. Fix this by checking the devid instead: for replace targets it's always equal to BTRFS_DEV_REPLACE_DEVID. Cc: Stefan Behrens <sbehrens@giantdisaster.de> Signed-off-by: Ilya Dryomov <idryomov@gmail.com> Reviewed-by: Stefan Behrens <sbehrens@giantdisaster.de> Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
* Btrfs: fixup error handling in btrfs_reloc_cowJosef Bacik2013-09-213-22/+32
| | | | | | | | | | | If we failed to actually allocate the correct size of the extent to relocate we will end up in an infinite loop because we won't return an error, we'll just move on to the next extent. So fix this up by returning an error, and then fix all the callers to return an error up the stack rather than BUG_ON()'ing. Thanks, Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
* Merge tag 'v3.11' into for-linusChris Mason2013-09-214-49/+57
|\ | | | | | | Linux 3.11
| * Merge branch 'akpm' (patches from Andrew Morton)Linus Torvalds2013-08-291-1/+1
| |\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Merge fixes from Andrew Morton: "Five fixes. err, make that six. let me try again" * emailed patches from Andrew Morton <akpm@linux-foundation.org>: fs/ocfs2/super.c: Use bigger nodestr to accomodate 32-bit node numbers memcg: check that kmem_cache has memcg_params before accessing it drivers/base/memory.c: fix show_mem_removable() to handle missing sections IPC: bugfix for msgrcv with msgtyp < 0 Omnikey Cardman 4000: pull in ioctl.h in user header timer_list: correct the iterator for timer_list
| | * fs/ocfs2/super.c: Use bigger nodestr to accomodate 32-bit node numbersGoldwyn Rodrigues2013-08-291-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | While using pacemaker/corosync, the node numbers are generated using IP address as opposed to serial node number generation. This may not fit in a 8-byte string. Use a bigger string to print the complete node number. Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com> Cc: Mark Fasheh <mfasheh@suse.com> Cc: Joel Becker <jlbec@evilplan.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| * | vfs: make the dentry cache use the lockref infrastructureWaiman Long2013-08-292-37/+26
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This just replaces the dentry count/lock combination with the lockref structure that contains both a count and a spinlock, and does the mechanical conversion to use the lockref infrastructure. There are no semantic changes here, it's purely syntactic. The reference lockref implementation uses the spinlock exactly the same way that the old dcache code did, and the bulk of this patch is just expanding the internal "d_count" use in the dcache code to use "d_lockref.count" instead. This is purely preparation for the real change to make the reference count updates be lockless during the 3.12 merge window. [ As with the previous commit, this is a rewritten version of a concept originally from Waiman, so credit goes to him, blame for any errors goes to me. Waiman's patch had some semantic differences for taking advantage of the lockless update in dget_parent(), while this patch is intentionally a pure search-and-replace change with no semantic changes. - Linus ] Signed-off-by: Waiman Long <Waiman.Long@hp.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| * | Revert "fs: Allow unprivileged linkat(..., AT_EMPTY_PATH) aka flink"Linus Torvalds2013-08-281-3/+7
| |/ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This reverts commit bb2314b47996491bbc5add73633905c3120b6268. It wasn't necessarily wrong per se, but we're still busily discussing the exact details of this all, so I'm going to revert it for now. It's true that you can already do flink() through /proc and that flink() isn't new. But as Brad Spengler points out, some secure environments do not mount proc, and flink adds a new interface that can avoid path lookup of the source for those kinds of environments. We may re-do this (and even mark it for stable backporting back in 3.11 and possibly earlier) once the whole discussion about the interface is done. Cc: Andy Lutomirski <luto@amacapital.net> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Brad Spengler <spender@grsecurity.net> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| * Merge tag 'jfs-3.11-rc8' of git://github.com/kleikamp/linux-shaggyLinus Torvalds2013-08-271-8/+23
| |\ | | | | | | | | | | | | | | | | | | | | | | | | Pull jfs fix from Dave Kleikamp: "One JFS patch to fix an incompatibility with NFSv4 resulting in the nfs client reporting a readdir loop" * tag 'jfs-3.11-rc8' of git://github.com/kleikamp/linux-shaggy: jfs: fix readdir cookie incompatibility with NFSv4
| | * jfs: fix readdir cookie incompatibility with NFSv4Dave Kleikamp2013-08-161-8/+23
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | NFSv4 reserves readdir cookie values 0-2 for special entries (. and ..), but jfs allows a value of 2 for a non-special entry. This incompatibility can result in the nfs client reporting a readdir loop. This patch doesn't change the value stored internally, but adds one to the value exposed to the iterate method. Signed-off-by: Dave Kleikamp <dave.kleikamp@oracle.com> Tested-by: Christian Kujau <lists@nerdbynature.de>
* | | Btrfs: optimize key searches in btrfs_search_slotFilipe David Borba Manana2013-09-011-2/+40
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
* | | Btrfs: don't use an async starter for most of our workersJosef Bacik2013-09-011-7/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
* | | Btrfs: only update disk_i_size as we remove extentsJosef Bacik2013-09-011-3/+28
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
* | | Btrfs: fix deadlock in uuid scan kthreadFilipe David Borba Manana2013-09-011-17/+18
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
* | | Btrfs: stop refusing the relocation of chunk 0Ilya Dryomov2013-09-011-4/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
* | | Btrfs: fix memory leak of uuid_root in free_fs_infoFilipe David Borba Manana2013-09-011-0/+1
| | | | | | | | | | | | | | | | | | 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>
* | | btrfs: reuse kbasename helperAndy Shevchenko2013-09-011-12/+6
| | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
* | | btrfs: return btrfs error code for dev excl ops errAnand Jain2013-09-011-8/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
* | | Btrfs: allow partial ordered extent completionJosef Bacik2013-09-013-18/+62
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
* | | Btrfs: convert all bug_ons in free-space-cache.cJosef Bacik2013-09-011-14/+14
| | | | | | | | | | | | | | | | | | | | | | | | 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>
* | | Btrfs: add support for assertsJosef Bacik2013-09-012-0/+25
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
* | | Btrfs: adjust the fs_devices->missing count on unmountJosef Bacik2013-09-011-0/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
* | | Btrf: cleanup: don't check for root_refs == 0 twiceStefan Behrens2013-09-013-13/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
* | | Btrfs: fix for patch "cleanup: don't check the same thing twice"Stefan Behrens2013-09-011-1/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
* | | Btrfs: get rid of one BUG() in write_all_supers()Stefan Behrens2013-09-011-2/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
* | | Btrfs: allocate prelim_ref with a slab allocaterWang Shilong2013-09-013-6/+37
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
* | | Btrfs: pass gfp_t to __add_prelim_ref() to avoid always using GFP_ATOMICWang Shilong2013-09-011-15/+15
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
* | | Btrfs: fix race conditions in BTRFS_IOC_FS_INFO ioctlFilipe David Borba Manana2013-09-012-3/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
* | | Btrfs: fix race between removing a dev and writing sbsFilipe David Borba Manana2013-09-012-3/+7
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
* | | Btrfs: remove ourselves from the cluster list under lockJosef Bacik2013-09-011-1/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
* | | Btrfs: do not clear our orphan item runtime flag on eexistJosef Bacik2013-09-011-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
* | | Btrfs: fix send to deal with sparse files properlyJosef Bacik2013-09-011-3/+31
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
* | | Btrfs: fix printing of non NULL terminated stringFilipe David Borba Manana2013-09-011-3/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
* | | Btrfs: Use %z to format size_tGeert Uytterhoeven2013-09-011-4/+2
| | | | | | | | | | | | | | | | | | Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
* | | Btrfs: Do not truncate sector_t on 32-bit with CONFIG_LBDAF=yGeert Uytterhoeven2013-09-011-5/+7
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | sector_t may be either "u64" (always 64 bit) or "unsigned long" (32 or 64 bit). Casting it to "unsigned long" will truncate it on 32-bit platforms where CONFIG_LBDAF=y. Cast to "unsigned long long" and format using "ll" instead. Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-17 18:48:38 +0100