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authoralfred <alfred@FreeBSD.org>1999-12-13 02:28:53 +0000
committeralfred <alfred@FreeBSD.org>1999-12-13 02:28:53 +0000
commit8a21e37554bb51157840405b76b020bfbd5b442b (patch)
tree25c582fb49021a8295ff0a90a182cae87de6eb4e /share/man
parentce079123e3550908356dfbaf3f42672876a55777 (diff)
downloadFreeBSD-src-8a21e37554bb51157840405b76b020bfbd5b442b.zip
FreeBSD-src-8a21e37554bb51157840405b76b020bfbd5b442b.tar.gz
explain that ioflags can be used to give read-ahead hints to the underlying
filesystem.
Diffstat (limited to 'share/man')
-rw-r--r--share/man/man9/VOP_RDWR.96
1 files changed, 5 insertions, 1 deletions
diff --git a/share/man/man9/VOP_RDWR.9 b/share/man/man9/VOP_RDWR.9
index 5e67262..a1e28fd 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
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