- 19 Apr, 2021 40 commits
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Josef Bacik authored
If we error out COWing the root node when doing a replace_path then we simply unlock and free the buffer and return the error. Reviewed-by:
Qu Wenruo <wqu@suse.com> Signed-off-by:
Josef Bacik <josef@toxicpanda.com> Reviewed-by:
David Sterba <dsterba@suse.com> Signed-off-by:
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Josef Bacik authored
A few BUG_ON()'s in replace_path are purely to keep us from making logical mistakes, so replace them with ASSERT()'s. Reviewed-by:
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Josef Bacik authored
We call btrfs_update_root in btrfs_update_reloc_root, which can fail for all sorts of reasons, including IO errors. Instead of panicing the box lets return the error, now that all callers properly handle those errors. Reviewed-by:
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Josef Bacik authored
btrfs_update_reloc_root will will return errors in the future, so handle an error properly in prepare_to_merge. Signed-off-by:
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Josef Bacik authored
btrfs_update_reloc_root will will return errors in the future, so handle the error properly in insert_dirty_subvol. Signed-off-by:
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Josef Bacik authored
This will be able to return errors in the future, so change it to return an error and handle the errors appropriately. Signed-off-by:
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Josef Bacik authored
btrfs_update_reloc_root will will return errors in the future, so handle the error properly in commit_fs_roots. Reviewed-by:
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Josef Bacik authored
If we fail to setup a root->reloc_root in a different thread that path will error out, however it still leaves root->reloc_root NULL but would still appear set up in the transaction. Subsequent calls to btrfs_record_root_in_transaction would succeed without attempting to create the reloc root, as the transid has already been updated. Handle this case by making sure we have a root->reloc_root set after a btrfs_record_root_in_transaction call so we don't end up dereferencing a NULL pointer. Reported-by:
Zygo Blaxell <ce3g8jdj@umail.furryterror.org> Signed-off-by:
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Josef Bacik authored
We do memory allocations here, read blocks from disk, all sorts of operations that could easily fail at any given point. Instead of panicing the box, simply return the error back up the chain, all callers at this point have proper error handling. Signed-off-by:
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Josef Bacik authored
create_reloc_root will return errors in the future, and __add_reloc_root can return ENOMEM or EEXIST, so handle these errors properly. Signed-off-by:
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Josef Bacik authored
We can create a reloc root when we record the root in the trans, which can fail for all sorts of different reasons. Propagate this error up the chain of callers. Future patches will fix the callers of btrfs_record_root_in_trans() to handle the error. Reviewed-by:
Johannes Thumshirn <johannes.thumshirn@wdc.com> Signed-off-by:
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Josef Bacik authored
record_root_in_trans can currently fail, so handle this failure properly. Reviewed-by:
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Josef Bacik authored
record_root_in_trans can fail currently, handle this failure properly. Signed-off-by:
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Josef Bacik authored
record_root_in_trans can fail currently, so handle this failure properly. Reviewed-by:
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Josef Bacik authored
btrfs_record_root_in_trans will return errors in the future, so handle the error properly in start_transaction. Reviewed-by:
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Josef Bacik authored
btrfs_record_root_in_trans will return errors in the future, so handle the error properly in relocate_tree_block. Reviewed-by:
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Josef Bacik authored
btrfs_record_root_in_trans will return errors in the future, so handle the error properly in create_subvol. Signed-off-by:
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Josef Bacik authored
btrfs_record_root_in_trans will return errors in the future, so handle the error properly in btrfs_recover_log_trees. This appears tricky, however we have a reference count on the destination root, so if this fails we need to continue on in the loop to make sure the proper cleanup is done. Reviewed-by:
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Josef Bacik authored
btrfs_record_root_in_trans will return errors in the future, so handle the error properly in btrfs_delete_subvolume. Reviewed-by:
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Josef Bacik authored
btrfs_record_root_in_trans will return errors in the future, so handle the error properly in btrfs_rename. Signed-off-by:
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Josef Bacik authored
btrfs_record_root_in_trans will return errors in the future, so handle the error properly in btrfs_rename_exchange. Reviewed-by:
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Josef Bacik authored
Generally speaking this shouldn't ever fail, the corresponding fs root for the reloc root will already be in memory, so we won't get ENOMEM here. However if there is no corresponding root for the reloc root then we could get ENOMEM when we try to allocate it or we could get ENOENT when we look it up and see that it doesn't exist. Convert these BUG_ON()'s into ASSERT()'s and add proper error handling for the case of corruption. Signed-off-by:
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Josef Bacik authored
We will record the fs root or the reloc root in the trans in select_reloc_root. These will actually return errors in the following patches, so check their return value here and return it up the stack. Reviewed-by:
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Josef Bacik authored
We have several BUG_ON()'s in select_reloc_root() that can be tripped if there is an extent tree corruption. Convert these to ASSERT()'s, because if we hit it during testing it really is bad, or could indicate a problem with the backref walking code. However if users hit these problems it generally indicates corruption, I've hit a few machines in the fleet that trip over these with clearly corrupted extent trees, so be nice and print out an error message and return an error instead of bringing the whole box down. Signed-off-by:
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Josef Bacik authored
Currently select_reloc_root() doesn't return an error, but followup patches will make it possible for it to return an error. We do have proper error recovery in do_relocation however, so handle the possibility of select_reloc_root() having an error properly instead of BUG_ON(!root). I've also adjusted select_reloc_root() to return ERR_PTR(-ENOENT) if we don't find a root, instead of NULL, to make the error case easier to deal with. I've replaced the BUG_ON(!root) with an ASSERT(0) for this case as it indicates we messed up the backref walking code, but it could also indicate corruption. Signed-off-by:
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Josef Bacik authored
We have a couple of BUG_ON()'s in relocate_tree_block() that can be tripped if we have file system corruption. Convert these to ASSERT()'s so developers still get yelled at when they break the backref code, but error out nicely for users so the whole box doesn't go down. Reviewed-by:
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Josef Bacik authored
A few of these are checking for correctness, and won't be triggered by corrupted file systems, so convert them to ASSERT() instead of BUG_ON() and add a comment explaining their existence. Reviewed-by:
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Matthew Wilcox (Oracle) authored
Implement readahead_batch_length() to determine the number of bytes in the current batch of readahead pages and use it in btrfs. Also use the readahead_pos to get the offset. Signed-off-by:
Matthew Wilcox (Oracle) <willy@infradead.org> Reviewed-by:
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Wan Jiabing authored
There are two forward declarations deep in extent_io.h, move them to the beginning and remove the duplicate one. Reviewed-by:
Nikolay Borisov <nborisov@suse.com> Signed-off-by:
Wan Jiabing <wanjiabing@vivo.com> Reviewed-by:
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Qu Wenruo authored
This patch adds an overview how btrfs subpage support works: - limitations - behavior - basic implementation points Signed-off-by:
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Qu Wenruo authored
Current set_btree_ioerr() only accepts @page parameter and grabs extent buffer from page::private. This works fine for sector size == PAGE_SIZE case, but not for subpage case. Add an extra parameter, @eb, for callers to pass extent buffer to this function, so that subpage code can reuse this function. And also add subpage special handling to update btrfs_subpage::error_bitmap. Signed-off-by:
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Qu Wenruo authored
For set_extent_buffer_dirty() to support subpage sized metadata, just call btrfs_page_set_dirty() to handle both cases. For clear_extent_buffer_dirty(), it needs to clear the page dirty if and only if all extent buffers in the page range are no longer dirty. Also do the same for page error. This is pretty different from the existing clear_extent_buffer_dirty() routine, so add a new helper function, clear_subpage_extent_buffer_dirty() to do this for subpage metadata. Also since the main part of clearing page dirty code is still the same, extract that into btree_clear_page_dirty() so that it can be utilized for both cases. But there is a special race between set_extent_buffer_dirty() and clear_extent_buffer_dirty(), where we can clear the page dirty. [POSSIBLE RACE WINDOW] For the race window between clear_subpage_extent_buffer_dirty() and set_extent_buffer_dirty(), due to the fact that we can't call clear_page_dirty_for_io() under subpage spin lock, we can race like below: T1 (eb1 in the same page) | T2 (eb2 in the same page) -------------------------------+------------------------------ set_extent_buffer_dirty() | clear_extent_buffer_dirty() |- was_dirty = false; | |- clear_subpagE_extent_buffer_dirty() | | |- btrfs_clear_and_test_dirty() | | | Since eb2 is the last dirty page | | | we got: | | | last == true; | | | |- btrfs_page_set_dirty() | | | We set the page dirty and | | | subpage dirty bitmap | | | | |- if (last) | | | Since we don't have subpage lock | | | held, now @last is no longer | | | correct | | |- btree_clear_page_dirty() | | Now PageDirty == false, even if | | we have dirty_bitmap not zero. |- ASSERT(PageDirty()); | ^^^^ CRASH The solution here is to also lock the eb->pages[0] for subpage case of set_extent_buffer_dirty(), to prevent racing with clear_extent_buffer_dirty(). Signed-off-by: -
Qu Wenruo authored
There are quite some assert checks on page uptodate in extent buffer write accessors. They ensure the destination page is already uptodate. This is fine for regular sector size case, but not for subpage case, as for subpage we only mark the page uptodate if the page contains no hole and all its extent buffers are uptodate. So instead of checking PageUptodate(), for subpage case we check the uptodate bitmap of btrfs_subpage structure. To make the check more elegant, introduce a helper, assert_eb_page_uptodate() to do the check for both subpage and regular sector size cases. The following functions are involved: - write_extent_buffer_chunk_tree_uuid() - write_extent_buffer_fsid() - write_extent_buffer() - memzero_extent_buffer() - copy_extent_buffer() - extent_buffer_test_bit() - extent_buffer_bitmap_set() - extent_buffer_bitmap_clear() Signed-off-by:
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Qu Wenruo authored
In alloc_extent_buffer(), we make sure that the newly allocated page is never dirty. This is fine for sector size == PAGE_SIZE case, but for subpage it's possible that one extent buffer in the page is dirty, thus the whole page is marked dirty, and could cause false alert. To support subpage, call btrfs_page_test_dirty() to handle both cases. Signed-off-by:
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Qu Wenruo authored
Add a new helper, csum_dirty_subpage_buffers(), to iterate through all dirty extent buffers in one bvec. Also extract the code of calculating csum for one extent buffer into csum_one_extent_buffer(), so that both the existing csum_dirty_buffer() and the new csum_dirty_subpage_buffers() can reuse the same routine. Signed-off-by:
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Qu Wenruo authored
For btree_set_page_dirty(), we should also check the extent buffer sanity for subpage support. Unlike the regular sector size case, since one page can contain multiple extent buffers, we need to make sure there is at least one dirty extent buffer in the page. So this patch will iterate through the btrfs_subpage::dirty_bitmap to get the extent buffers, and check if any dirty extent buffer in the page range has EXTENT_BUFFER_DIRTY and proper refs. Signed-off-by:
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Qu Wenruo authored
Introduces the following functions to handle subpage writeback status: - btrfs_subpage_set_writeback() - btrfs_subpage_clear_writeback() - btrfs_subpage_test_writeback() These helpers can only be called when the range is ensured to be inside the page. - btrfs_page_set_writeback() - btrfs_page_clear_writeback() - btrfs_page_test_writeback() These helpers can handle both regular sector size and subpage without problem. Signed-off-by:
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Qu Wenruo authored
Introduce the following functions to handle subpage dirty status: - btrfs_subpage_set_dirty() - btrfs_subpage_clear_dirty() - btrfs_subpage_test_dirty() These helpers can only be called when the range is ensured to be inside the page. - btrfs_page_set_dirty() - btrfs_page_clear_dirty() - btrfs_page_test_dirty() These helpers can handle both regular sector size and subpage without problem. Thus they would be used to replace PageDirty() related calls in later patches. There is one special point to note here, just like set_page_dirty() and clear_page_dirty_for_io(), btrfs_*page_set_dirty() and btrfs_*page_clear_dirty() must be called with page locked. Signed-off-by:
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Qu Wenruo authored
In btrfs_invalidatepage() we re-declare @tree variable as btrfs_ordered_inode_tree. Since it's only used to do the spinlock, we can grab it from inode directly, and remove the unnecessary declaration completely. Reviewed-by:
Anand Jain <anand.jain@oracle.com> Signed-off-by:
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Qu Wenruo authored
In btrfs_invalidatepage() we introduce a temporary variable, new_len, to update ordered->truncated_len. But we can use min() to replace it completely and no need for the variable. Reviewed-by:
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