This patchset implement the data repair function for the direct read, it
is implemented like buffered read:
1.When we find the data is not right, we try to read the data from the other
mirror.
2.When the io on the mirror ends, we will insert the endio work into the
dedicated btrfs workqueue, not common read endio workqueue, because the
original endio work is still blocked in the btrfs endio workqueue, if we
insert the endio work of the io on the mirror into that workqueue, deadlock
would happen.
3.If We get right data, we write it back to repair the corrupted mirror.
4.If the data on the new mirror is still corrupted, we will try next
mirror until we read right data or all the mirrors are traversed.
5.After the above work, we set the uptodate flag according to the result.
The difference is that the direct read may be splited to several small io,
in order to get the number of the mirror on which the io error happens. we
have to do data check and repair on the end IO function of those sub-IO
request.
Besides that, we also fixed some bugs of direct io.
Changelog v3 - v4:
- Remove the 1st patch which has been applied into the upstream kernel.
- Use a dedicated btrfs workqueue instead of the system workqueue to
deal with the completed repair bio, this suggest was from Chris.
- Rebase the patchset to integration branch of Chris's git tree.
Changelog v2 - v3:
- Fix wrong returned bio when doing bio clone, which was reported by Filipe
Changelog v1 - v2:
- Fix the warning which was triggered by __GFP_ZERO in the 2nd patch
Miao Xie (11):
Btrfs: load checksum data once when submitting a direct read io
Btrfs: cleanup similar code of the buffered data data check and dio
read data check
Btrfs: do file data check by sub-bio's self
Btrfs: fix missing error handler if submiting re-read bio fails
Btrfs: Cleanup unused variant and argument of IO failure handlers
Btrfs: split bio_readpage_error into several functions
Btrfs: modify repair_io_failure and make it suit direct io
Btrfs: modify clean_io_failure and make it suit direct io
Btrfs: Set real mirror number for read operation on RAID0/5/6
Btrfs: implement repair function when direct read fails
Btrfs: cleanup the read failure record after write or when the inode
is freeing
fs/btrfs/async-thread.c | 1 +
fs/btrfs/async-thread.h | 1 +
fs/btrfs/btrfs_inode.h | 10 +-
fs/btrfs/ctree.h| 4 +-
fs/btrfs/disk-io.c | 11 +-
fs/btrfs/disk-io.h | 1 +
fs/btrfs/extent_io.c| 254 +--
fs/btrfs/extent_io.h| 38 -
fs/btrfs/file-item.c| 14 +-
fs/btrfs/inode.c| 446 +++-
fs/btrfs/scrub.c| 4 +-
fs/btrfs/volumes.c | 5 +
fs/btrfs/volumes.h | 5 +-
13 files changed, 601 insertions(+), 193 deletions(-)
--
1.9.3
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