Generic event handling mechanism.
I send this patchset for comments and review, it still contains AIO and
aio_sendfile() implementation on top of get_block() abstraction, which was
decided to postpone for a while (it is simpler right now to generate patchset
as a whole,
when kevent will be ready for merge, I will generate patchset without AIO
stuff).
Since number of suggested changes goes from 'several' to 'very small', I'm
asking for
inclusion or declining. Currently only AIO stuff requires some changes, and as
sugested by
Christoph Hellwig, will not supposed to be merged right now.
Should I prepare final patchset and what should it include?
Thank you.
Changes from 'take4' patchset:
* use miscdevice instead of chardevice
* comments fixes
Changes from 'take3' patchset:
* removed serializing mutex from kevent_user_wait()
* moved storage list processing to RCU
* removed lockdep screaming - all storage locks are initialized in the same
function, so it was learned
to differentiate between various cases
* remove kevent from storage if is marked as broken after callback
* fixed a typo in mmaped buffer implementation which would end up in wrong
index calcualtion
Changes from 'take2' patchset:
* split kevent_finish_user() to locked and unlocked variants
* do not use KEVENT_STAT ifdefs, use inline functions instead
* use array of callbacks of each type instead of each kevent callback
initialization
* changed name of ukevent guarding lock
* use only one kevent lock in kevent_user for all hash buckets instead of
per-bucket locks
* do not use kevent_user_ctl structure instead provide needed arguments as
syscall parameters
* various indent cleanups
* added optimisation, which is aimed to help when a lot of kevents are being
copied from userspace
* mapped buffer (initial) implementation (no userspace yet)
Changes from 'take1' patchset:
- rebased against 2.6.18-git tree
- removed ioctl controlling
- added new syscall kevent_get_events(int fd, unsigned int min_nr, unsigned
int max_nr,
unsigned int timeout, void __user *buf, unsigned flags)
- use old syscall kevent_ctl for creation/removing, modification and initial
kevent
initialization
- use mutuxes instead of semaphores
- added file descriptor check and return error if provided descriptor does not
match
kevent file operations
- various indent fixes
- removed aio_sendfile() declarations.
Thank you.
Signed-off-by: Evgeniy Polyakov <[EMAIL PROTECTED]>
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