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Subject[RFC PATCH 5/5] fuse: add documentation of sysfs parameter to limit maximum fuse request size
Add an explantion about the sysfs parameter to the limit
maximum read/write request size.

Signed-off-by: Mitsuo Hayasaka <>
Cc: Rob Landley <>
Cc: Miklos Szeredi <>

Documentation/filesystems/fuse.txt | 17 ++++++++++++++++-
1 files changed, 16 insertions(+), 1 deletions(-)

diff --git a/Documentation/filesystems/fuse.txt b/Documentation/filesystems/fuse.txt
index 13af4a4..e6ffba3 100644
--- a/Documentation/filesystems/fuse.txt
+++ b/Documentation/filesystems/fuse.txt
@@ -108,13 +108,28 @@ Mount options

With this option the maximum size of read operations can be set.
The default is infinite. Note that the size of read requests is
- limited anyway to 32 pages (which is 128kbyte on i386).
+ limited to 32 pages (which is 128kbyte on i386) if direct_io
+ option is not specified. When direct_io option is specified,
+ the request size is limited to max_pages_per_req sysfs parameter.


Set the block size for the filesystem. The default is 512. This
option is only valid for 'fuseblk' type mounts.

+Sysfs parameter
+The sysfs parameter max_pages_per_req limits the maximum page size per
+FUSE request.
+ /sys/fs/fuse/max_pages_per_req
+The default is 32 pages. It can be changed from 32 to 256 pages, which
+may improve the read/write throughput optimizing it. This change is
+effective per mount. Therefore, the re-mounting of FUSE filesystem
+is required after changing it.
Control filesystem

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