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| author | Alfred Perlstein <alfred@FreeBSD.org> | 1999-12-13 02:28:53 +0000 |
|---|---|---|
| committer | Alfred Perlstein <alfred@FreeBSD.org> | 1999-12-13 02:28:53 +0000 |
| commit | 1e12157c61b09924aecf94545a1e94be772e803d (patch) | |
| tree | e42255eefbe7a86c59120c6a008b22f0d790a871 /share/man/man9/VOP_RDWR.9 | |
| parent | c0230c1b3d332536703c3c2dd27a1096d3c8fe2d (diff) | |
| download | src-1e12157c61b09924aecf94545a1e94be772e803d.tar.gz src-1e12157c61b09924aecf94545a1e94be772e803d.zip | |
explain that ioflags can be used to give read-ahead hints to the underlying
filesystem.
Notes
Notes:
svn path=/head/; revision=54533
Diffstat (limited to 'share/man/man9/VOP_RDWR.9')
| -rw-r--r-- | share/man/man9/VOP_RDWR.9 | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/share/man/man9/VOP_RDWR.9 b/share/man/man9/VOP_RDWR.9 index 5e67262da0c7..a1e28fd72d63 100644 --- a/share/man/man9/VOP_RDWR.9 +++ b/share/man/man9/VOP_RDWR.9 @@ -60,7 +60,11 @@ the credentials of the caller .Pp The .Fa ioflag -argument is a bit mask which can contain the following flags: +argument is used to give directives and hints to the filesystem. +When attempting a read, the high 16 bits are used to provide a +read-ahead hint (in units of filesystem blocks) that the filesystem +should attempt. The low 16 bits are a bit mask which can contain +the following flags: .Bl -tag -width IO_NODELOCKED .It Dv IO_UNIT do I/O as atomic unit |