diff options
| author | Tyler Fanelli <tfanelli@redhat.com> | 2023-09-19 22:40:01 -0400 |
|---|---|---|
| committer | Miklos Szeredi <mszeredi@redhat.com> | 2023-12-04 10:16:53 +0100 |
| commit | 11ca77cdcca17cec909d2b97404ddacfec0acafd (patch) | |
| tree | f3e345e9f82cef4a94cde84da8689df4beaf2315 /Documentation/filesystems | |
| parent | c55e0a55b165202f18cbc4a20650d2e1becd5507 (diff) | |
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: Tyler Fanelli <tfanelli@redhat.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Diffstat (limited to 'Documentation/filesystems')
| -rw-r--r-- | Documentation/filesystems/fuse-io.rst | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/Documentation/filesystems/fuse-io.rst b/Documentation/filesystems/fuse-io.rst index 255a368fe534..6464de4266ad 100644 --- a/Documentation/filesystems/fuse-io.rst +++ b/Documentation/filesystems/fuse-io.rst @@ -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 |