- 26 Jul, 2016 19 commits
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Liu Bo authored
eb->io_pages is set in read_extent_buffer_pages(). In case of readpage failure, for pages that have been added to bio, it calls bio_endio and later readpage_io_failed_hook() does the work. When this eb's page (couldn't be the 1st page) fails to add itself to bio due to failure in merge_bio(), it cannot decrease eb->io_pages via bio_endio, and ends up with a memory leak eventually. This lets __do_readpage propagate errors to callers and adds the 'atomic_dec(&eb->io_pages)'. Signed-off-by:
Liu Bo <bo.li.liu@oracle.com> Reviewed-by:
David Sterba <dsterba@suse.com> Signed-off-by:
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Liu Bo authored
Since it is just an in-memory building of the backrefs of several btree blocks, nothing is fatal other than memory leaks, so this changes BUG_ON()'s to ASSERT()'s. Signed-off-by:
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Wang Xiaoguang authored
In btrfs, btrfs_space_info's bytes_may_use is treated as fs used space, as what we do in reserve_metadata_bytes() or btrfs_alloc_data_chunk_ondemand(), so in dump_space_info(), when calculating free space, we should also subtract btrfs_space_info's bytes_may_use. Signed-off-by:
Wang Xiaoguang <wangxg.fnst@cn.fujitsu.com> Reviewed-by:
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Chandan Rajendra authored
btrfs/073 invokes scrub ioctl in a tight loop. In subpage-blocksize scenario this results in a lot of "scrub: size assumption sectorsize != PAGE_SIZE " messages being printed on the console. To reduce the number of such messages this commit uses btrfs_err_rl() instead of btrfs_err(). Signed-off-by:
Chandan Rajendra <chandan@linux.vnet.ibm.com> Signed-off-by:
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Wang Xiaoguang authored
Extract cow_file_range() new parameters for both in-band dedupe and subpage sector size patchset. This should make conflict of both patchset to minimal, and reduce the effort needed to rebase them. Cc: Chandan Rajendra <chandan@linux.vnet.ibm.com> Cc: David Sterba <dsterba@suse.cz> Signed-off-by:
Qu Wenruo <quwenruo@cn.fujitsu.com> Signed-off-by:
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Liu Bo authored
This is similar to btrfs_submit_compressed_read(), if we fail after bio is allocated, then we can use bio_endio() and errors are saved in bio->bi_error. But please note that we don't return errors to its caller because the caller assumes it won't call endio to cleanup on error. Signed-off-by:
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Anand Jain authored
An inconsistent behavior due to stale reads from the disk was reported mail-archive.com/linux-btrfs@vger.kernel.org/msg54188.html This patch will make sure devices are synced before return in the unmount thread. Signed-off-by:
Anand Jain <anand.jain@oracle.com> Signed-off-by:
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Anand Jain authored
Moves closer to the caller and removes declaration Signed-off-by:
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Ashish Samant authored
Remove unnecessary checks in compress_file_range(). Signed-off-by:
Ashish Samant <ashish.samant@oracle.com> [ minor coding style fixups ] Signed-off-by:
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Liu Bo authored
One can use btrfs-corrupt-block to hit BUG_ON() in merge_bio(), thus this aims to stop anyone to panic the whole system by using their btrfs. Since the error in merge_bio can only come from __btrfs_map_block() when chunk tree mapping has something insane and __btrfs_map_block() has already had printed the reason, we can just return errors in merge_bio. Signed-off-by:
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Nikolay Borisov authored
BTRFS is using a variety of slab caches to satisfy internal needs. Those slab caches are always allocated with the SLAB_RECLAIM_ACCOUNT, meaning allocations from the caches are going to be accounted as SReclaimable. At the same time btrfs is not registering any shrinkers whatsoever, thus preventing memory from the slabs to be shrunk. This means those caches are not in fact reclaimable. To fix this remove the SLAB_RECLAIM_ACCOUNT on all caches apart from the inode cache, since this one is being freed by the generic VFS super_block shrinker. Also set the transaction related caches as SLAB_TEMPORARY, to better document the lifetime of the objects (it just translates to SLAB_RECLAIM_ACCOUNT). Signed-off-by:
Nikolay Borisov <n.borisov.lkml@gmail.com> Reviewed-by:
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Hans van Kranenburg authored
BTRFS_IOC_LOGICAL_INO takes a btrfs_ioctl_logical_ino_args as argument, not a btrfs_ioctl_ino_path_args. The lines were probably copy/pasted when the code was written. Since btrfs_ioctl_logical_ino_args and btrfs_ioctl_ino_path_args have the same size, the actual IOCTL definition here does not change. But, it makes the code less confusing for the reader. Signed-off-by:
Hans van Kranenburg <hans.van.kranenburg@mendix.com> Signed-off-by:
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Salah Triki authored
size contains the value returned by posix_acl_from_xattr(), which returns -ERANGE, -ENODATA, zero, or an integer greater than zero. So replace -ENOENT by -ERANGE. Signed-off-by:
Salah Triki <salah.triki@gmail.com> Reviewed-by:
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Nikolay Borisov authored
The code flow in btrfs_new_inode allows for btrfs_evict_inode to be called with not fully initialised inode (e.g. ->root member not being set). This can happen when btrfs_set_inode_index in btrfs_new_inode fails, which in turn would call iput for the newly allocated inode. This in turn leads to vfs calling into btrfs_evict_inode. This leads to null pointer dereference. To handle this situation check whether the passed inode has root set and just free it in case it doesn't. Signed-off-by:
Nikolay Borisov <kernel@kyup.com> Reviewed-by:
Josef Bacik <jbacik@fb.com> Signed-off-by:
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Liu Bo authored
We use read_node_slot() to read btree node and it has two cases, a) slot is out of range, which means 'no such entry' b) we fail to read the block, due to checksum fails or corrupted content or not with uptodate flag. But we're returning NULL in both cases, this makes it return -ENOENT in case a) and return -EIO in case b), and this fixes its callers as well as btrfs_search_forward() 's caller to catch the new errors. The problem is reported by Peter Becker, and I can manage to hit the same BUG_ON by mounting my fuzz image. Reported-by:
Peter Becker <floyd.net@gmail.com> Signed-off-by:
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Liu Bo authored
I got this warning while mounting a btrfs image, [ 3020.509606] ------------[ cut here ]------------ [ 3020.510107] WARNING: CPU: 3 PID: 5581 at lib/idr.c:1051 ida_remove+0xca/0x190 [ 3020.510853] ida_remove called for id=42 which is not allocated. [ 3020.511466] Modules linked in: [ 3020.511802] CPU: 3 PID: 5581 Comm: mount Not tainted 4.7.0-rc5+ #274 [ 3020.512438] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.8.2-20150714_191134- 04/01/2014 [ 3020.513385] 0000000000000286 0000000021295d86 ffff88006c66b8f0 ffffffff8182ba5a [ 3020.514153] 0000000000000000 0000000000000009 ffff88006c66b930 ffffffff810e0ed7 [ 3020.514928] 0000041b00000000 ffffffff8289a8c0 ffff88007f437880 0000000000000000 [ 3020.515717] Call Trace: [ 3020.515965] [<ffffffff8182ba5a>] dump_stack+0xc9/0x13f [ 3020.516487] [<ffffffff810e0ed7>] __warn+0x147/0x160 [ 3020.517005] [<ffffffff810e0f4f>] warn_slowpath_fmt+0x5f/0x80 [ 3020.517572] [<ffffffff8182e6ca>] ida_remove+0xca/0x190 [ 3020.518075] [<ffffffff813a2bcc>] free_anon_bdev+0x2c/0x60 [ 3020.518609] [<ffffffff81657a9f>] free_fs_root+0x13f/0x160 [ 3020.519138] [<ffffffff8165c679>] btrfs_get_fs_root+0x379/0x3d0 [ 3020.519710] [<ffffffff81e6e975>] ? __mutex_unlock_slowpath+0x155/0x2c0 [ 3020.520366] [<ffffffff816615b1>] open_ctree+0x2e91/0x3200 [ 3020.520965] [<ffffffff8161ede2>] btrfs_mount+0x1322/0x15b0 [ 3020.521536] [<ffffffff81e60e74>] ? kmemleak_alloc_percpu+0x44/0x170 [ 3020.522167] [<ffffffff8115f5e1>] ? lockdep_init_map+0x61/0x210 [ 3020.522780] [<ffffffff813a4f59>] mount_fs+0x49/0x2c0 [ 3020.523305] [<ffffffff813d840c>] vfs_kern_mount+0xac/0x1b0 [ 3020.523872] [<ffffffff8161dee1>] btrfs_mount+0x421/0x15b0 [ 3020.524402] [<ffffffff81e60e74>] ? kmemleak_alloc_percpu+0x44/0x170 [ 3020.525045] [<ffffffff8115f5e1>] ? lockdep_init_map+0x61/0x210 [ 3020.525657] [<ffffffff8115f5e1>] ? lockdep_init_map+0x61/0x210 [ 3020.526289] [<ffffffff813a4f59>] mount_fs+0x49/0x2c0 [ 3020.526803] [<ffffffff813d840c>] vfs_kern_mount+0xac/0x1b0 [ 3020.527365] [<ffffffff813dc27a>] do_mount+0x41a/0x1770 [ 3020.527899] [<ffffffff812e800d>] ? strndup_user+0x6d/0xc0 [ 3020.528447] [<ffffffff812e7f68>] ? memdup_user+0x78/0xb0 [ 3020.528987] [<ffffffff813ddad0>] SyS_mount+0x150/0x160 [ 3020.529493] [<ffffffff81e72b7c>] entry_SYSCALL_64_fastpath+0x1f/0xbd It turns out that we free fs root twice, btrfs_init_fs_root() calls free_anon_bdev(root->anon_dev) and later then btrfs_get_fs_root() cals free_fs_root which does another free_anon_bdev() and it ends up with the above warning. Instead of reset root->anon_dev to 0 after free_anon_bdev(), we can let btrfs_init_fs_root() return directly since its callers have already done the free job by calling free_fs_root(). Signed-off-by:
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Liu Bo authored
With btrfs-corrupt-block, one can set btree node/leaf's field, if we assign a negative value to node/leaf, we can get various hangs, eg. if extent_root's nritems is -2ULL, then we get stuck in btrfs_read_block_groups() because it has a while loop and btrfs_search_slot() on extent_root will always return the first child. This lets us know what's happening and returns a EINVAL to callers instead of returning the first item. Signed-off-by:
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Liu Bo authored
With btrfs-corrupt-block, one can drop one chunk item and mounting will end up with a panic in btrfs_full_stripe_len(). This doesn't not remove the BUG_ON, but instead checks it a bit earlier when we find the block group item. Signed-off-by:
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Wang Xiaoguang authored
Signed-off-by:
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- 21 Jul, 2016 1 commit
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Chris Mason authored
Commit 56244ef1 was almost but not quite enough to fix the reservation math after btrfs_copy_from_user returned partial copies. Some users are still seeing warnings in btrfs_destroy_inode, and with a long enough test run I'm able to trigger them as well. This patch fixes the accounting math again, bringing it much closer to the way it was before the sectorsize conversion Chandan did. The problem is accounting for the offset into the page/sector when we do a partial copy. This one just uses the dirty_sectors variable which should already be updated properly. Signed-off-by:
Chris Mason <clm@fb.com> cc: stable@vger.kernel.org # v4.6+
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- 20 Jul, 2016 2 commits
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Josef Bacik authored
The new enospc code makes it possible to deadlock if we don't use FLUSH_LIMIT during reservations inside a transaction. This enforces the correct flush type to avoid both deadlocks and assertions Signed-off-by:
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Chris Mason authored
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- 07 Jul, 2016 18 commits
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Josef Bacik authored
We used to allow you to set FLUSH_ALL and then just wouldn't do things like commit transactions or wait on ordered extents if we noticed you were in a transaction. However now that all the flushing for FLUSH_ALL is asynchronous we've lost the ability to tell, and we could end up deadlocking. So instead use FLUSH_LIMIT in reserve_metadata_bytes in relocation and then return -EAGAIN if we error out to preserve the previous behavior. I've also added an ASSERT() to catch anybody else who tries to do this. Thanks, Signed-off-by:
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Josef Bacik authored
Since we set the reloc control before we've reserved our space for relocation we could race with a root being dirtied and not actually have space to do our init reloc root. So once we've allocated it and set it up go ahead and make our reservation before setting the relocate control, that way anybody who tries to do the reloc root init has space to use. Thanks, Signed-off-by:
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Josef Bacik authored
This is the case all the time anyway except for relocation which could be doing a reloc root for a non ref counted root, in which case we'd end up with some random block rsv rather than the one we have our reservation in. If there isn't enough space in the block rsv we are trying to steal from we'll BUG() because we expect there to be space for the orphan to make its reservation. Thanks, Signed-off-by:
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Josef Bacik authored
Traditionally we've calculated the global block rsv by guessing how much of the metadata used amount was the extent tree, and then taking the data size and figuring out how large the csum tree would have to be to hold that much data. This is imprecise and falls down on MIXED file systems as we can't trust the data used amount. This resulted in failures for xfstests generic/333 because it creates lots of clones, which explodes out the extent tree. Our global reserve calculations were woefully inaccurate in this case which meant we got into a situation where we did not have enough reserved to do our work. We know we only use the global block rsv for the extent, csum, and root trees, so just get the bytes used for these trees and use that as the basis of our global reserve. Since these are not reference counted trees the bytes_used value will be accurate. This fixed the transaction aborts seen with generic/333. Thanks, Signed-off-by:
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Josef Bacik authored
Instead of doing fs_info->fs_root in need_async_flush, which may not be set during recovery when mounting, just pass the root itself in, which makes more sense as thats what btrfs_calc_reclaim_metadata_size takes. Signed-off-by:
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Josef Bacik authored
We do this check when we start the async reclaimer thread, might as well check before we kick it off to save us some cycles. Thanks, Signed-off-by:
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Josef Bacik authored
We were doing trace_btrfs_release_reserved_extent() in pin_down_extent which isn't quite right because we will go through and free that extent later when we unpin, so it messes up apps that are accounting for the reservation space. We were also unconditionally doing it in __btrfs_free_reserved_extent(), when we only actually free the reservation instead of pinning the extent. Thanks, Signed-off-by:
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Josef Bacik authored
When tracing enospc problems on a box with multiple file systems mounted I need to be able to differentiate between the two file systems. Most of the important trace points I'm looking at already have an fsid, but the reserved extent trace points do not, so add that to make it possible to figure out which trace point belongs to which file system. Thanks, Signed-off-by:
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Josef Bacik authored
We want to track when we're triggering flushing from our reservation code and what flushing is being done when we start flushing. Thanks, Signed-off-by:
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Josef Bacik authored
We can sometimes drop the reservation we had for our inode, so we need to remove that amount from to_reserve so that our tracepoint reports a valid amount of space. Signed-off-by:
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Josef Bacik authored
Pinned extents are an important metric to keep track of for enospc. Signed-off-by:
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Josef Bacik authored
Our enospc flushing sucks. It is born from a time where we were early enospc'ing constantly because multiple threads would race in for the same reservation and randomly starve other ones out. So I came up with this solution to block any other reservations from happening while one guy tried to flush stuff to satisfy his reservation. This gives us pretty good correctness, but completely crap latency. The solution I've come up with is ticketed reservations. Basically we try to make our reservation, and if we can't we put a ticket on a list in order and kick off an async flusher thread. This async flusher thread does the same old flushing we always did, just asynchronously. As space is freed and added back to the space_info it checks and sees if we have any tickets that need satisfying, and adds space to the tickets and wakes up anything we've satisfied. Once the flusher thread stops making progress it wakes up all the current tickets and tells them to take a hike. There is a priority list for things that can't flush, since the async flusher could do anything we need to avoid deadlocks. These guys get priority for having their reservation made, and will still do manual flushing themselves in case the async flusher isn't running. This patch gives us significantly better latencies. Thanks, Signed-off-by:
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Josef Bacik authored
I'm writing a tool to visualize the enospc system inside btrfs, I need this tracepoint in order to keep track of the block groups in the system. Thanks, Signed-off-by:
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Josef Bacik authored
These were hidden behind enospc_debug, which isn't helpful as they indicate actual bugs, unlike the rest of the enospc_debug stuff which is really debug information. Thanks, Signed-off-by:
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Josef Bacik authored
We reserve space for the inode update when we first reserve space for writing to a file. However there are lots of ways that we can use this reservation and not have it for subsequent ordered extents. Previously we'd fall through and try to reserve metadata bytes for this, then we'd just steal the full reservation from the delalloc_block_rsv, and if that didn't have enough space we'd steal the full reservation from the global reserve. The problem with this is we can easily just return ENOSPC and fallback to updating the inode item directly. In the worst case (assuming 4k nodesize) we'd steal 64kib from the global reserve if we fall all the way through, however if we just fallback and update the inode directly we'd only steal 4k * BTRFS_PATH_MAX in the worst case which is 32kib. We would have also just added the extent item for the inode so we likely will have already cow'ed down most of the way to the leaf containing the inode item, so we are more often than not only need one or two nodesize's worth of reservations. Given the reservation for the extent itself is also a worst case we will likely already have space to cover the inode update. This change will make us behave better in the theoretical worst case, and much better in the case that we don't have our reservation and cannot reserve more metadata. Thanks, Signed-off-by:
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Josef Bacik authored
There are a few races in the metadata reservation stuff. First we add the bytes to the block_rsv well after we've set the bit on the inode saying that we have space for it and after we've reserved the bytes. So use the normal btrfs_block_rsv_add helper for this case. Secondly we can flush delalloc extents when we try to reserve space for our write, which means that we could have used up the space for the inode and we wouldn't know because we only check before the reservation. So instead make sure we are always reserving space for the inode update, and then if we don't need it release those bytes afterward. Thanks, Signed-off-by:
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Josef Bacik authored
So btrfs_block_rsv_migrate just unconditionally calls block_rsv_migrate_bytes. Not only this but it unconditionally changes the size of the block_rsv. This isn't a bug strictly speaking, but it makes truncate block rsv's look funny because every time we migrate bytes over its size grows, even though we only want it to be a specific size. So collapse this into one function that takes an update_size argument and make truncate and evict not update the size for consistency sake. Thanks, Signed-off-by:
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Josef Bacik authored
For some reason we're adding bytes_readonly to the space info after we update the space info with the block group info. This creates a tiny race where we could over-reserve space because we haven't yet taken out the bytes_readonly bit. Since we already know this information at the time we call update_space_info, just pass it along so it can be updated all at once. Thanks, Signed-off-by:
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