- 25 9月, 2008 15 次提交
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由 Chris Mason 提交于
File syncs and directory syncs are optimized by copying their items into a special (copy-on-write) log tree. There is one log tree per subvolume and the btrfs super block points to a tree of log tree roots. After a crash, items are copied out of the log tree and back into the subvolume. See tree-log.c for all the details. Signed-off-by: NChris Mason <chris.mason@oracle.com>
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由 Yan Zheng 提交于
This trivial patch contains two locking fixes and a off by one fix. --- Signed-off-by: NChris Mason <chris.mason@oracle.com>
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由 Sage Weil 提交于
Commit 597:466b27332893 (btrfs_start_transaction: wait for commits in progress) breaks the transaction start/stop ioctls by making btrfs_start_transaction conditionally wait for the next transaction to start. If an application artificially is holding a transaction open, things deadlock. This workaround maintains a count of open ioctl-initiated transactions in fs_info, and avoids wait_current_trans() if any are currently open (in start_transaction() and btrfs_throttle()). The start transaction ioctl uses a new btrfs_start_ioctl_transaction() that _does_ call wait_current_trans(), effectively pushing the join/wait decision to the outer ioctl-initiated transaction. This more or less neuters btrfs_throttle() when ioctl-initiated transactions are in use, but that seems like a pretty fundamental consequence of wrapping lots of write()'s in a transaction. Btrfs has no way to tell if the application considers a given operation as part of it's transaction. Obviously, if the transaction start/stop ioctls aren't being used, there is no effect on current behavior. Signed-off-by: NSage Weil <sage@newdream.net> --- ctree.h | 1 + ioctl.c | 12 +++++++++++- transaction.c | 18 +++++++++++++----- transaction.h | 2 ++ 4 files changed, 27 insertions(+), 6 deletions(-) Signed-off-by: NChris Mason <chris.mason@oracle.com>
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由 Yan Zheng 提交于
To check whether a given file extent is referenced by multiple snapshots, the checker walks down the fs tree through dead root and checks all tree blocks in the path. We can easily detect whether a given tree block is directly referenced by other snapshot. We can also detect any indirect reference from other snapshot by checking reference's generation. The checker can always detect multiple references, but can't reliably detect cases of single reference. So btrfs may do file data cow even there is only one reference. Signed-off-by: NChris Mason <chris.mason@oracle.com>
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由 Chris Mason 提交于
A large reference cache is directly related to a lot of work pending for the cleaner thread. This throttles back new operations based on the size of the reference cache so the cleaner thread will be able to keep up. Overall, this actually makes the FS faster because the cleaner thread will be more likely to find things in cache. Signed-off-by: NChris Mason <chris.mason@oracle.com>
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由 Chris Mason 提交于
btrfs_commit_transaction has to loop waiting for any writers in the transaction to finish before it can proceed. btrfs_start_transaction should be polite and not join a transaction that is in the process of being finished off. There are a few places that can't wait, basically the ones doing IO that might be needed to finish the transaction. For them, btrfs_join_transaction is added. Signed-off-by: NChris Mason <chris.mason@oracle.com>
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由 Chris Mason 提交于
The old data=ordered code would force commit to wait until all the data extents from the transaction were fully on disk. This introduced large latencies into the commit and stalled new writers in the transaction for a long time. The new code changes the way data allocations and extents work: * When delayed allocation is filled, data extents are reserved, and the extent bit EXTENT_ORDERED is set on the entire range of the extent. A struct btrfs_ordered_extent is allocated an inserted into a per-inode rbtree to track the pending extents. * As each page is written EXTENT_ORDERED is cleared on the bytes corresponding to that page. * When all of the bytes corresponding to a single struct btrfs_ordered_extent are written, The previously reserved extent is inserted into the FS btree and into the extent allocation trees. The checksums for the file data are also updated. Signed-off-by: NChris Mason <chris.mason@oracle.com>
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由 Chris Mason 提交于
The btree defragger wasn't making forward progress because the new key wasn't being saved by the btrfs_search_forward function. This also disables the automatic btree defrag, it wasn't scaling well to huge filesystems. The auto-defrag needs to be done differently. Signed-off-by: NChris Mason <chris.mason@oracle.com>
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由 Chris Mason 提交于
This creates one kthread for commits and one kthread for deleting old snapshots. All the work queues are removed. Signed-off-by: NChris Mason <chris.mason@oracle.com>
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由 Chris Mason 提交于
The existing throttle mechanism was often not sufficient to prevent new writers from coming in and making a given transaction run forever. This adds an explicit wait at the end of most operations so they will allow the current transaction to close. There is no wait inside file_write, inode updates, or cow filling, all which have different deadlock possibilities. This is a temporary measure until better asynchronous commit support is added. This code leads to stalls as it waits for data=ordered writeback, and it really needs to be fixed. Signed-off-by: NChris Mason <chris.mason@oracle.com>
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由 Chris Mason 提交于
There is now extent_map for mapping offsets in the file to disk and extent_io for state tracking, IO submission and extent_bufers. The new extent_map code shifts from [start,end] pairs to [start,len], and pushes the locking out into the caller. This allows a few performance optimizations and is easier to use. A number of extent_map usage bugs were fixed, mostly with failing to remove extent_map entries when changing the file. Signed-off-by: NChris Mason <chris.mason@oracle.com>
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由 Chris Mason 提交于
It is very difficult to create a consistent snapshot of the btree when other writers may update the btree before the commit is done. This changes the snapshot creation to happen during the commit, while no other updates are possible. Signed-off-by: NChris Mason <chris.mason@oracle.com>
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由 Chris Mason 提交于
This forces file data extents down the disk along with the metadata that references them. The current implementation is fairly simple, and just writes out all of the dirty pages in an inode before the commit. Signed-off-by: NChris Mason <chris.mason@oracle.com>
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由 Chris Mason 提交于
Signed-off-by: NChris Mason <chris.mason@oracle.com>
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由 Chris Mason 提交于
Signed-off-by: NChris Mason <chris.mason@oracle.com>
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- 11 9月, 2007 1 次提交
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由 Chris Mason 提交于
Dead roots are trees left over after a crash, and they were either in the process of being removed or were waiting to be removed when the box crashed. Before, a search of the entire tree of root pointers was done on mount looking for dead roots. Now, the search is done the first time we load a root. This makes mount faster when there are a large number of snapshots, and it enables the block accounting code to properly update the block counts on the latest root as old versions of the root are reaped after a crash. Signed-off-by: NChris Mason <chris.mason@oracle.com>
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- 11 8月, 2007 2 次提交
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由 Josef Bacik 提交于
Signed-off-by: NChris Mason <chris.mason@oracle.com>
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由 Chris Mason 提交于
Signed-off-by: NChris Mason <chris.mason@oracle.com>
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- 09 8月, 2007 1 次提交
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由 Chris Mason 提交于
Signed-off-by: NChris Mason <chris.mason@oracle.com>
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- 08 8月, 2007 1 次提交
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由 Chris Mason 提交于
This adds two types of btree defrag, a run time form that tries to defrag recently allocated blocks in the btree when they are still in ram, and an ioctl that forces defrag of all btree blocks. File data blocks are not defragged yet, but this can make a huge difference in sequential btree reads. Signed-off-by: NChris Mason <chris.mason@oracle.com>
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- 23 6月, 2007 1 次提交
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由 Chris Mason 提交于
Signed-off-by: NChris Mason <chris.mason@oracle.com>
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- 12 6月, 2007 1 次提交
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由 Chris Mason 提交于
Signed-off-by: NChris Mason <chris.mason@oracle.com>
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- 09 6月, 2007 2 次提交
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由 Chris Mason 提交于
Signed-off-by: NChris Mason <chris.mason@oracle.com>
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由 Chris Mason 提交于
Signed-off-by: NChris Mason <chris.mason@oracle.com>
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- 01 5月, 2007 1 次提交
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由 Chris Mason 提交于
Signed-off-by: NChris Mason <chris.mason@oracle.com>
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- 28 4月, 2007 1 次提交
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由 Chris Mason 提交于
Signed-off-by: NChris Mason <chris.mason@oracle.com>
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- 20 4月, 2007 1 次提交
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由 Chris Mason 提交于
Signed-off-by: NChris Mason <chris.mason@oracle.com>
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- 02 4月, 2007 1 次提交
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由 Chris Mason 提交于
Signed-off-by: NChris Mason <chris.mason@oracle.com>
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- 23 3月, 2007 2 次提交
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由 Chris Mason 提交于
Signed-off-by: NChris Mason <chris.mason@oracle.com>
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由 Chris Mason 提交于
Signed-off-by: NChris Mason <chris.mason@oracle.com>
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- 17 3月, 2007 1 次提交
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由 Chris Mason 提交于
Signed-off-by: NChris Mason <chris.mason@oracle.com>
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