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author | Christoph Hellwig <hch@infradead.org> | 2013-09-04 17:04:39 +0400 |
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committer | Al Viro <viro@zeniv.linux.org.uk> | 2013-09-04 17:23:46 +0400 |
commit | 7b7a8665edd8db733980389b098530f9e4f630b2 (patch) | |
tree | 968d570a9f0c4d861226aefed2f5f97a131c8d53 /firmware/sb16 | |
parent | 4b6ccca701ef5977d0ffbc2c932430dea88b38b6 (diff) | |
download | linux-7b7a8665edd8db733980389b098530f9e4f630b2.tar.xz |
direct-io: Implement generic deferred AIO completions
Add support to the core direct-io code to defer AIO completions to user
context using a workqueue. This replaces opencoded and less efficient
code in XFS and ext4 (we save a memory allocation for each direct IO)
and will be needed to properly support O_(D)SYNC for AIO.
The communication between the filesystem and the direct I/O code requires
a new buffer head flag, which is a bit ugly but not avoidable until the
direct I/O code stops abusing the buffer_head structure for communicating
with the filesystems.
Currently this creates a per-superblock unbound workqueue for these
completions, which is taken from an earlier patch by Jan Kara. I'm
not really convinced about this use and would prefer a "normal" global
workqueue with a high concurrency limit, but this needs further discussion.
JK: Fixed ext4 part, dynamic allocation of the workqueue.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'firmware/sb16')
0 files changed, 0 insertions, 0 deletions