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fuse: enable caching of symlinks

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FUSE file reads are cached in the page cache, but symlink reads are
not. This patch enables FUSE READLINK operations to be cached which
can improve performance of some FUSE workloads.

In particular, I'm working on a FUSE filesystem for access to source
code and discovered that about a 10% improvement to build times is
achieved with this patch (there are a lot of symlinks in the source
tree).

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Dan Schatzberg 2018-10-11 08:17:00 -07:00 • committed by Miklos Szeredi
parent 9a2eb24d1a
commit 5571f1e654
4 changed files with 92 additions and 26 deletions
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3
include/uapi/linux/fuse.h
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@ -121,6 +121,7 @@
* - add FUSE_COPY_FILE_RANGE
* - add FOPEN_CACHE_DIR
* - add FUSE_MAX_PAGES, add max_pages to init_out
* - add FUSE_CACHE_SYMLINKS
*/
#ifndef _LINUX_FUSE_H
@ -257,6 +258,7 @@ struct fuse_file_lock {
* FUSE_POSIX_ACL: filesystem supports posix acls
* FUSE_ABORT_ERROR: reading the device after abort returns ECONNABORTED
* FUSE_MAX_PAGES: init_out.max_pages contains the max number of req pages
* FUSE_CACHE_SYMLINKS: cache READLINK responses
*/
#define FUSE_ASYNC_READ (1 << 0)
#define FUSE_POSIX_LOCKS (1 << 1)
@ -281,6 +283,7 @@ struct fuse_file_lock {
#define FUSE_POSIX_ACL (1 << 20)
#define FUSE_ABORT_ERROR (1 << 21)
#define FUSE_MAX_PAGES (1 << 22)
#define FUSE_CACHE_SYMLINKS (1 << 23)
/**
* CUSE INIT request/reply flags