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fuse: support clients that don't implement 'opendir'

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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 <[email protected]>
Signed-off-by: Miklos Szeredi <[email protected]>
This commit is contained in:
Chad Austin 2019-01-07 16:53:17 -08:00 • committed by Miklos Szeredi
commit d9a9ea94f7
4 changed files with 18 additions and 6 deletions
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11
fs/fuse/file.c
View file

@ -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;
}
}

3
fs/fuse/fuse_i.h
View file

@ -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;

3
fs/fuse/inode.c
View file

@ -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);