Commit 11ca77cd authored by Tyler Fanelli's avatar Tyler Fanelli Committed by Miklos Szeredi
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docs/fuse-io: Document the usage of DIRECT_IO_ALLOW_MMAP 



By default, shared mmap is disabled in FUSE DIRECT_IO mode. However,
when the DIRECT_IO_ALLOW_MMAP flag is enabled in the FUSE_INIT reply,
shared mmap is allowed.

Signed-off-by: default avatarTyler Fanelli <tfanelli@redhat.com>
Signed-off-by: default avatarMiklos Szeredi <mszeredi@redhat.com>
parent c55e0a55

Documentation/filesystems/fuse-io.rst

+2 −1
Original line number Diff line number Diff line
@@ -15,7 +15,8 @@ The direct-io mode can be selected with the FOPEN_DIRECT_IO flag in the 
FUSE_OPEN reply.



In direct-io mode the page cache is completely bypassed for reads and writes.

No read-ahead takes place. Shared mmap is disabled.

No read-ahead takes place. Shared mmap is disabled by default. To allow shared

mmap, the FUSE_DIRECT_IO_ALLOW_MMAP flag may be enabled in the FUSE_INIT reply.



In cached mode reads may be satisfied from the page cache, and data may be

read-ahead by the kernel to fill the cache.  The cache is always kept consistent