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Message-ID: <20250217133228.24405-3-luis@igalia.com>
Date: Mon, 17 Feb 2025 13:32:28 +0000
From: Luis Henriques <luis@...lia.com>
To: Miklos Szeredi <miklos@...redi.hu>,
Bernd Schubert <bschubert@....com>
Cc: Dave Chinner <david@...morbit.com>,
Alexander Viro <viro@...iv.linux.org.uk>,
Christian Brauner <brauner@...nel.org>,
Jan Kara <jack@...e.cz>,
Matt Harvey <mharvey@...ptrading.com>,
linux-fsdevel@...r.kernel.org,
linux-kernel@...r.kernel.org,
Luis Henriques <luis@...lia.com>
Subject: [PATCH v6 2/2] fuse: add new function to invalidate cache for all inodes
Currently userspace is able to notify the kernel to invalidate the cache
for an inode. This means that, if all the inodes in a filesystem need to
be invalidated, then userspace needs to iterate through all of them and do
this kernel notification separately.
This patch adds a new option that allows userspace to invalidate all the
inodes with a single notification operation. In addition to invalidate
all the inodes, it also shrinks the sb dcache.
Signed-off-by: Luis Henriques <luis@...lia.com>
---
fs/fuse/inode.c | 34 ++++++++++++++++++++++++++++++++++
include/uapi/linux/fuse.h | 3 +++
2 files changed, 37 insertions(+)
diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index e9db2cb8c150..64fa0806e97d 100644
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -547,6 +547,37 @@ struct inode *fuse_ilookup(struct fuse_conn *fc, u64 nodeid,
return NULL;
}
+static int fuse_reverse_inval_all(struct fuse_conn *fc)
+{
+ struct fuse_mount *fm;
+ struct inode *inode;
+
+ inode = fuse_ilookup(fc, FUSE_ROOT_ID, &fm);
+ if (!inode || !fm)
+ return -ENOENT;
+ iput(inode);
+
+ /* Remove all possible active references to cached inodes */
+ shrink_dcache_sb(fm->sb);
+
+ /* Remove all unreferenced inodes from cache */
+ invalidate_inodes(fm->sb);
+
+ return 0;
+}
+
+/*
+ * Notify to invalidate inodes cache. It can be called with @nodeid set to
+ * either:
+ *
+ * - An inode number - Any pending writebacks within the rage [@offset @len]
+ * will be triggered and the inode will be validated. To invalidate the whole
+ * cache @offset has to be set to '0' and @len needs to be <= '0'; if @offset
+ * is negative, only the inode attributes are invalidated.
+ *
+ * - FUSE_INVAL_ALL_INODES - All the inodes in the superblock are invalidated
+ * and the whole dcache is shrinked.
+ */
int fuse_reverse_inval_inode(struct fuse_conn *fc, u64 nodeid,
loff_t offset, loff_t len)
{
@@ -555,6 +586,9 @@ int fuse_reverse_inval_inode(struct fuse_conn *fc, u64 nodeid,
pgoff_t pg_start;
pgoff_t pg_end;
+ if (nodeid == FUSE_INVAL_ALL_INODES)
+ return fuse_reverse_inval_all(fc);
+
inode = fuse_ilookup(fc, nodeid, NULL);
if (!inode)
return -ENOENT;
diff --git a/include/uapi/linux/fuse.h b/include/uapi/linux/fuse.h
index 5e0eb41d967e..e5852b63f99f 100644
--- a/include/uapi/linux/fuse.h
+++ b/include/uapi/linux/fuse.h
@@ -669,6 +669,9 @@ enum fuse_notify_code {
FUSE_NOTIFY_CODE_MAX,
};
+/* The nodeid to request to invalidate all inodes */
+#define FUSE_INVAL_ALL_INODES 0
+
/* The read buffer is required to be at least 8k, but may be much larger */
#define FUSE_MIN_READ_BUFFER 8192
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