Xin LI 82aebf697c Add two new fcntls to enable/disable read-ahead: ...

- F_READAHEAD: specify the amount for sequential access.  The amount is
   specified in bytes and is rounded up to nearest block size.
 - F_RDAHEAD: Darwin compatible version that use 128KB as the sequential
   access size.

A third argument of zero disables the read-ahead behavior.

Please note that the read-ahead amount is also constrainted by sysctl
variable, vfs.read_max, which may need to be raised in order to better
utilize this feature.

Thanks Igor Sysoev for proposing the feature and submitting the original
version, and kib@ for his valuable comments.

Submitted by:	Igor Sysoev <is rambler-co ru>
Reviewed by:	kib@
MFC after:	1 month

2009-09-28 16:59:47 +00:00

..

__error.c

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2007-01-12 07:31:30 +00:00

_exit.2

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accept.2

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aio_error.2

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aio_read.2

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2005-12-13 13:43:35 +00:00

aio_return.2

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2006-10-07 10:49:20 +00:00

aio_suspend.2

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2008-04-03 02:41:54 +00:00

aio_waitcomplete.2

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aio_write.2

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2005-12-13 13:43:35 +00:00

bind.2

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extattr_get_file.2

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2008-01-29 18:15:38 +00:00

fcntl.2

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2009-09-28 16:59:47 +00:00

fcntl.c

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2008-05-30 14:47:42 +00:00

fhopen.2

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flock.2

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lseek.2

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minherit.2

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mkdir.2

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mmap.c

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shmctl.2

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