- 21 Jun, 2017 1 commit
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Jeff Mahoney authored
On an uncontended system, we can end up hitting soft lockups while doing replace_path. At the core, and frequently called is btrfs_qgroup_trace_leaf_items, so it makes sense to add a cond_resched there. Signed-off-by:
Jeff Mahoney <jeffm@suse.com> Reviewed-by:
David Sterba <dsterba@suse.com> Signed-off-by:
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- 20 Jun, 2017 5 commits
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Nikolay Borisov authored
We got an internal report about a file system not wanting to mount following 99e3ecfc ("Btrfs: add more validation checks for superblock"). BTRFS error (device sdb1): super_total_bytes 1000203816960 mismatch with fs_devices total_rw_bytes 1000203820544 Subtracting the numbers we get a difference of less than a 4kb. Upon closer inspection it became apparent that mkfs actually rounds down the size of the device to a multiple of sector size. However, the same cannot be said for various functions which modify the total size and are called from btrfs_balance as well as when adding a new device. So this patch ensures that values being saved into on-disk data structures are always rounded down to a multiple of sectorsize. Signed-off-by:
Nikolay Borisov <nborisov@suse.com> Signed-off-by:
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Nikolay Borisov authored
The device->total_bytes member needs to always be rounded down to sectorsize so that it corresponds to the value of super->total_bytes. However, there are multiple places where the setter is fed a value which is not rounded which can cause a fs to be unmountable due to the check introduced in 99e3ecfc ("Btrfs: add more validation checks for superblock"). This patch implements the getter/setter manually so that in a later patch I can add necessary code to catch offenders. Signed-off-by:
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David Sterba authored
The mount option alloc_start was used in the past for debugging and stressing the chunk allocator. Not meant to be used by users, so we're not breaking anybody's setup. There was some added complexity handling changes of the value and when it was not same as default. Such code has likely been untested and I think it's better to remove it. This patch kills all use of alloc_start, and by doing that also fixes a bug when alloc_size is set, potentially called from statfs: in btrfs_calc_avail_data_space, traversing the list in RCU, the RCU protection is temporarily dropped so btrfs_account_dev_extents_size can be called and then RCU is locked again! Doing that inside list_for_each_entry_rcu is just asking for trouble, but unlikely to be observed in practice. Signed-off-by: -
David Sterba authored
We can keep the state among the other fs_info flags, there's no reason why fs_frozen would need to be separate. Reviewed-by:
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David Sterba authored
The pattern when err is used for function exit and ret is used for return values of callees is not used here. Reviewed-by:
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- 19 Jun, 2017 34 commits
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David Sterba authored
The function is called from ioctl context and we don't hold any locks that take part in writeback. Right now it's only fs_info::volume_mutex. Reviewed-by:
Anand Jain <anand.jain@oracle.com> Signed-off-by:
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David Sterba authored
We don't hold any locks here. Inidirectly called from statfs. Reviewed-by:
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Nikolay Borisov authored
Signed-off-by:
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Anand Jain authored
Submit and wait parts of write_dev_flush() can be split into two separate functions for better readability. Signed-off-by:
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Anand Jain authored
There is no extra benefit to count null bdev during the submit loop, as these null devices will be anyway checked during command completion device loop just after the submit loop. We are holding the device_list_mutex, the device->bdev status won't change in between. Signed-off-by:
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Anand Jain authored
Since commit "btrfs: btrfs_io_bio_alloc never fails, skip error handling" write_dev_flush will not return ENOMEM in the sending part. We do not need to check for it in the callers. Signed-off-by:
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Timofey Titovets authored
We already skip storing data where compression does not make the result at least one byte less. Let's make the logic better and check that compression frees at least one sector size of bytes, otherwise it's not that useful. Signed-off-by:
Timofey Titovets <nefelim4ag@gmail.com> Reviewed-by:
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David Sterba authored
We can hardcode GFP_NOFS to btrfs_io_bio_alloc, although it means we change it back from GFP_KERNEL in scrub. I'd rather save a few stack bytes from not passing the gfp flags in the remaining, more imporatant, contexts and the bio allocating API now looks more consistent. Reviewed-by:
Liu Bo <bo.li.liu@oracle.com> Signed-off-by:
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David Sterba authored
We use btrfs_bioset for bios and ask to allocate the entire size of btrfs_io_bio from btrfs bio_alloc_bioset. The member 'bio' is initialized but the bytes from 0 to offset of 'bio' are left uninitialized. Although we initialize some of the members in our helpers, we should initialize the whole structures. Reviewed-by:
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David Sterba authored
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Hans van Kranenburg authored
A programmer who is trying to implement calling the btrfs SEARCH or SEARCH_V2 ioctl will probably soon end up reading this struct definition. Properly document the input fields to prevent common misconceptions: 1. The search space is linear, not 3 dimensional. The invidual min/max values for objectid, type and offset cannot be used to filter the result, they only define the endpoints of an interval. 2. The transaction id (a.k.a. generation) filter applies only on transaction id of the last COW operation on a whole metadata page, not on individual items. Ad 1. The first misunderstanding was helped by the previous misleading comments on min/max type and offset: "keys returned will be >= min and <= max". Ad 2. For example, running btrfs balance will happily cause rewriting of metadata pages that contain a filesystem tree of a read only subvolume, causing transids to be increased. Also, improve descriptions of tree_id and nr_items and add in/out annotations. Signed-off-by:
Hans van Kranenburg <hans.van.kranenburg@mendix.com> Signed-off-by:
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Liu Bo authored
Currently dio read also goes to verify checksum if -EIO has been returned, although it usually fails on checksum, it's not necessary at all, we could directly check if there is another copy to read. And with this, the behavior of dio read is now consistent with that of buffered read. Signed-off-by:
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Liu Bo authored
With raid1 profile, dio read isn't tolerating IO errors if read length is less than the stripe length (64K). Our bio didn't get split in btrfs_submit_direct_hook() if (dip->flags & BTRFS_DIO_ORIG_BIO_SUBMITTED) is true and that happens when the read length is less than 64k. In this case, if the underlying device returns error somehow, bio->bi_error has recorded that error. If we could recover the correct data from another copy in profile raid1/10/5/6, with btrfs_subio_endio_read() returning 0, bio would have the correct data in its vector, but bio->bi_error is not updated accordingly so that the following dio_end_io(dio_bio, bio->bi_error) makes directIO think this read has failed. This fixes the problem by setting bio's error to 0 if a good copy has been found. Signed-off-by:
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David Sterba authored
Most callers of btrfs_bio_alloc convert from bytes to sectors. Hide that in the helper and simplify the logic in the callsers. Reviewed-by:
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David Sterba authored
compressed_bio_alloc is now a trivial wrapper around btrfs_bio_alloc, no point keeping it. The error handling can be simplified, as we know btrfs_bio_alloc will never fail. Reviewed-by:
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David Sterba authored
All callers pass gfp_flags=GFP_NOFS and nr_vecs=BIO_MAX_PAGES. submit_extent_page adds __GFP_HIGH that does not make a difference in our case as it allows access to memory reserves but otherwise does not change the constraints. Signed-off-by: -
David Sterba authored
All callers pass GFP_NOFS. Reviewed-by:
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David Sterba authored
Update direct callers of btrfs_io_bio_alloc that do error handling, that we can now remove. Reviewed-by:
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David Sterba authored
Update direct callers of btrfs_bio_clone that do error handling, that we can now remove. Reviewed-by:
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David Sterba authored
Update direct callers of btrfs_bio_alloc that do error handling, that we can now remove. Reviewed-by:
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David Sterba authored
Christoph pointed out that bio allocations backed by a bioset will never fail. As we always use a bioset for all bio allocations, we can skip the error handling. This patch adjusts our low-level helpers, the cascaded changes to all callers will come next. CC: Liu Bo <bo.li.liu@oracle.com> Reviewed-by:
Christoph Hellwig <hch@lst.de> Reviewed-by:
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David Sterba authored
The compression workspace buffers are larger than a page so we use vmalloc, unconditionally. This is not always necessary as there might be contiguous memory available. Let's use the kvmalloc helpers that will try kmalloc first and fallback to vmalloc. For that they require GFP_KERNEL flags. As we now have the alloc_workspace calls protected by memalloc_nofs in the critical contexts, we can safely use GFP_KERNEL. Signed-off-by: -
David Sterba authored
As alloc_workspace is now protected by memalloc_nofs where needed, we can switch the kmalloc to use GFP_KERNEL. Reviewed-by:
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David Sterba authored
The workspaces are preallocated at the beginning where we can safely use GFP_KERNEL, but in some cases the find_workspace might reach the allocation again, now in a more restricted context when the bios or pages are being compressed. To avoid potential lockup when alloc_workspace -> vmalloc would silently use the GFP_KERNEL, add the memalloc_nofs helpers around the critical call site. Reviewed-by:
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David Sterba authored
As we don't use vmalloc/vzalloc/vfree directly in ctree.c, we can now use the proper header that defines kvmalloc. Signed-off-by: -
David Sterba authored
Now that init_ipath is called either from a safe context or with memalloc_nofs protection, we can switch to GFP_KERNEL allocations in init_path and init_data_container. Reviewed-by:
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David Sterba authored
init_ipath is called from a safe ioctl context and from scrub when printing an error. The protection is added for three reasons: * init_data_container calls vmalloc and this does not work as expected in the GFP_NOFS context, so this silently does GFP_KERNEL and might deadlock in some cases * keep the context constraint of GFP_NOFS, used by scrub * we want to use GFP_KERNEL unconditionally inside init_ipath or its callees Reviewed-by:
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David Sterba authored
We use a growing buffer for xattrs larger than a page size, at some point vmalloc is unconditionally used for larger buffers. We can still try to avoid it using the kvmalloc helper. Reviewed-by:
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David Sterba authored
The logic of kmalloc and vmalloc fallback is opencoded in several places, we can now use the existing helper. Signed-off-by: -
Timofey Titovets authored
Logic already skips if compression makes data bigger, let's sync lzo with zlib and also return error if compressed size is equal to input size. Signed-off-by:
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Guoqing Jiang authored
bio_io_error was introduced in the commit 4246a0b6 ("block: add a bi_error field to struct bio"), so use it to simplify code. Signed-off-by:
Guoqing Jiang <gqjiang@suse.com> Reviewed-by:
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Omar Sandoval authored
First, instead of open-coding the vmalloc() fallback, use the new kvzalloc() helper. Second, use memalloc_nofs_{save,restore}() instead of GFP_NOFS, as vmalloc() uses some GFP_KERNEL allocations internally which could lead to deadlocks. Signed-off-by:Omar Sandoval <osandov@fb.com> Reviewed-by:
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David Sterba authored
Observing the number of slab objects of btrfs_transaction, there's just one active on an almost quiescent filesystem, and the number of objects goes to about ten when sync is in progress. Then the nubmer goes down to 1. This matches the expectations of the transaction lifetime. For such use the separate slab cache is not justified, as we do not reuse objects frequently. For the shortlived transaction, the generic slab (size 512) should be ok. We can optimistically expect that the 512 slabs are not all used (fragmentation) and there are free slots to take when we do the allocation, compared to potentially allocating a whole new page for the separate slab. We'll lose the stats about the object use, which could be added later if we really need them. Signed-off-by: -
David Sterba authored
The structure scrub_wr_ctx is not used anywhere just the scrub context, we can move the members there. The tgtdev is renamed so it's more clear that it belongs to the "wr" part. Signed-off-by:
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