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From da57354dc8593d37eff59bc7836ee4e460a2659a Mon Sep 17 00:00:00 2001
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From: Nikolaus Rath <Nikolaus@rath.org>
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Date: Sat, 6 Apr 2019 18:34:57 +0100
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Subject: [PATCH 4/4] Add support for in-kernel readdir caching.
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Fixes: #394.
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(cherry picked from commit 1552b467fcd7751360299c5139382d78538e12b3)
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Signed-off-by: Pavel Reichl <preichl@redhat.com>
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---
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include/fuse_common.h | 18 +++++++++++++-----
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lib/fuse_lowlevel.c | 2 ++
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2 files changed, 15 insertions(+), 5 deletions(-)
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diff --git a/include/fuse_common.h b/include/fuse_common.h
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index a5a0ea5..a28ffa5 100644
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--- a/include/fuse_common.h
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+++ b/include/fuse_common.h
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@@ -45,9 +45,11 @@ struct fuse_file_info {
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/** Can be filled in by open, to use direct I/O on this file. */
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unsigned int direct_io : 1;
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- /** Can be filled in by open, to indicate that currently
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- cached file data (that the filesystem provided the last
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- time the file was open) need not be invalidated. */
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+ /** Can be filled in by open. It signals the kernel that any
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+ currently cached file data (ie., data that the filesystem
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+ provided the last time the file was open) need not be
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+ invalidated. Has no effect when set in other contexts (in
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+ particular it does nothing when set by opendir()). */
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unsigned int keep_cache : 1;
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/** Indicates a flush operation. Set in flush operation, also
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@@ -64,8 +66,14 @@ struct fuse_file_info {
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May only be set in ->release(). */
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unsigned int flock_release : 1;
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- /** Padding. Do not use*/
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- unsigned int padding : 27;
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+ /** Can be filled in by opendir. It signals the kernel to
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+ enable caching of entries returned by readdir(). Has no
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+ effect when set in other contexts (in particular it does
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+ nothing when set by open()). */
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+ unsigned int cache_readdir : 1;
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+
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+ /** Padding. Reserved for future use*/
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+ unsigned int padding : 26;
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/** File handle. May be filled in by filesystem in open().
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Available in all other file operations */
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diff --git a/lib/fuse_lowlevel.c b/lib/fuse_lowlevel.c
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index 43f785f..6379e09 100644
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--- a/lib/fuse_lowlevel.c
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+++ b/lib/fuse_lowlevel.c
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@@ -392,6 +392,8 @@ static void fill_open(struct fuse_open_out *arg,
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arg->open_flags |= FOPEN_DIRECT_IO;
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if (f->keep_cache)
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arg->open_flags |= FOPEN_KEEP_CACHE;
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+ if (f->cache_readdir)
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+ arg->open_flags |= FOPEN_CACHE_DIR;
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if (f->nonseekable)
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arg->open_flags |= FOPEN_NONSEEKABLE;
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}
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--
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2.36.1
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