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fuse: optmize missing FUSE_LINK support

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If filesystem doesn't support FUSE_LINK (i.e. returns -ENOSYS), then
remember this and next time return immediately, without incurring the
overhead of a round trip to the server.

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Miklos Szeredi 2025-02-14 11:00:53 +01:00
parent 8344213571
commit eef36cf6a7
2 changed files with 11 additions and 1 deletions
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9
fs/fuse/dir.c
View File

@ -1123,6 +1123,9 @@ static int fuse_link(struct dentry *entry, struct inode *newdir,
struct fuse_mount *fm = get_fuse_mount(inode);
FUSE_ARGS(args);
if (fm->fc->no_link)
goto out;
memset(&inarg, 0, sizeof(inarg));
inarg.oldnodeid = get_node_id(inode);
args.opcode = FUSE_LINK;
@ -1138,7 +1141,11 @@ static int fuse_link(struct dentry *entry, struct inode *newdir,
fuse_invalidate_attr(inode);
if (err == -ENOSYS)
err = -EPERM;
fm->fc->no_link = 1;
out:
if (fm->fc->no_link)
return -EPERM;
return err;
}

3
fs/fuse/fuse_i.h
View File

@ -870,6 +870,9 @@ struct fuse_conn {
/* Use pages instead of pointer for kernel I/O */
unsigned int use_pages_for_kvec_io:1;
/* Is link not implemented by fs? */
unsigned int no_link:1;
/* Use io_uring for communication */
unsigned int io_uring;