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authorChad Austin <chadaustin@fb.com>2019-01-08 03:53:17 +0300
committerMiklos Szeredi <mszeredi@redhat.com>2019-02-13 15:15:15 +0300
commitd9a9ea94f748f47b1d75c6c5e33edcf74476c445 (patch)
tree3da11cb177a59b58ea80d0985b29ceac5e8e5e7e /fs/fuse
parent2f7b6f5bed01a3fd2abcc20d2c85b7c532eb95cd (diff)
downloadlinux-d9a9ea94f748f47b1d75c6c5e33edcf74476c445.tar.xz
fuse: support clients that don't implement 'opendir'
Allow filesystems to return ENOSYS from opendir, preventing the kernel from sending opendir and releasedir messages in the future. This avoids userspace transitions when filesystems don't need to keep track of state per directory handle. A new capability flag, FUSE_NO_OPENDIR_SUPPORT, parallels FUSE_NO_OPEN_SUPPORT, indicating the new semantics for returning ENOSYS from opendir. Signed-off-by: Chad Austin <chadaustin@fb.com> Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Diffstat (limited to 'fs/fuse')
-rw-r--r--fs/fuse/file.c11
-rw-r--r--fs/fuse/fuse_i.h3
-rw-r--r--fs/fuse/inode.c3
3 files changed, 12 insertions, 5 deletions
diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 8ee0446a8322..cc6ffd23b80f 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -90,7 +90,7 @@ static void fuse_file_put(struct fuse_file *ff, bool sync, bool isdir)
if (refcount_dec_and_test(&ff->count)) {
struct fuse_req *req = ff->reserved_req;
- if (ff->fc->no_open && !isdir) {
+ if (isdir ? ff->fc->no_opendir : ff->fc->no_open) {
/*
* Drop the release request when client does not
* implement 'open'
@@ -125,7 +125,7 @@ int fuse_do_open(struct fuse_conn *fc, u64 nodeid, struct file *file,
ff->fh = 0;
ff->open_flags = FOPEN_KEEP_CACHE; /* Default for no-open */
- if (!fc->no_open || isdir) {
+ if (isdir ? !fc->no_opendir : !fc->no_open) {
struct fuse_open_out outarg;
int err;
@@ -134,11 +134,14 @@ int fuse_do_open(struct fuse_conn *fc, u64 nodeid, struct file *file,
ff->fh = outarg.fh;
ff->open_flags = outarg.open_flags;
- } else if (err != -ENOSYS || isdir) {
+ } else if (err != -ENOSYS) {
fuse_file_free(ff);
return err;
} else {
- fc->no_open = 1;
+ if (isdir)
+ fc->no_opendir = 1;
+ else
+ fc->no_open = 1;
}
}
diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
index 033e30af519f..0920c0c032a0 100644
--- a/fs/fuse/fuse_i.h
+++ b/fs/fuse/fuse_i.h
@@ -630,6 +630,9 @@ struct fuse_conn {
/** Is open/release not implemented by fs? */
unsigned no_open:1;
+ /** Is opendir/releasedir not implemented by fs? */
+ unsigned no_opendir:1;
+
/** Is fsync not implemented by fs? */
unsigned no_fsync:1;
diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index 2bbb7c59d6da..1b3f3b67d9f0 100644
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -972,7 +972,8 @@ static void fuse_send_init(struct fuse_conn *fc, struct fuse_req *req)
FUSE_DO_READDIRPLUS | FUSE_READDIRPLUS_AUTO | FUSE_ASYNC_DIO |
FUSE_WRITEBACK_CACHE | FUSE_NO_OPEN_SUPPORT |
FUSE_PARALLEL_DIROPS | FUSE_HANDLE_KILLPRIV | FUSE_POSIX_ACL |
- FUSE_ABORT_ERROR | FUSE_MAX_PAGES | FUSE_CACHE_SYMLINKS;
+ FUSE_ABORT_ERROR | FUSE_MAX_PAGES | FUSE_CACHE_SYMLINKS |
+ FUSE_NO_OPENDIR_SUPPORT;
req->in.h.opcode = FUSE_INIT;
req->in.numargs = 1;
req->in.args[0].size = sizeof(*arg);