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[PATCH] FUSE: add access call

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Add a new access call, which will only be called if ->permission is invoked
from sys_access().  In all other cases permission checking is delayed until
the actual filesystem operation.

Signed-off-by: Miklos Szeredi <miklos@szeredi.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Miklos Szeredi 2005-11-07 00:59:50 -08:00 committed by Linus Torvalds
parent 5b62073d50
commit 31d40d74b4
3 changed files with 45 additions and 1 deletions
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35
fs/fuse/dir.c
View File

@ -461,6 +461,38 @@ static int fuse_revalidate(struct dentry *entry)
return fuse_do_getattr(inode);
}
static int fuse_access(struct inode *inode, int mask)
{
struct fuse_conn *fc = get_fuse_conn(inode);
struct fuse_req *req;
struct fuse_access_in inarg;
int err;
if (fc->no_access)
return 0;
req = fuse_get_request(fc);
if (!req)
return -EINTR;
memset(&inarg, 0, sizeof(inarg));
inarg.mask = mask;
req->in.h.opcode = FUSE_ACCESS;
req->in.h.nodeid = get_node_id(inode);
req->inode = inode;
req->in.numargs = 1;
req->in.args[0].size = sizeof(inarg);
req->in.args[0].value = &inarg;
request_send(fc, req);
err = req->out.h.error;
fuse_put_request(fc, req);
if (err == -ENOSYS) {
fc->no_access = 1;
err = 0;
}
return err;
}
static int fuse_permission(struct inode *inode, int mask, struct nameidata *nd)
{
struct fuse_conn *fc = get_fuse_conn(inode);
@ -493,6 +525,9 @@ static int fuse_permission(struct inode *inode, int mask, struct nameidata *nd)
int mode = inode->i_mode;
if ((mask & MAY_EXEC) && !S_ISDIR(mode) && !(mode & S_IXUGO))
return -EACCES;
if (nd && (nd->flags & LOOKUP_ACCESS))
return fuse_access(inode, mask);
return 0;
}
}

3
fs/fuse/fuse_i.h
View File

@ -266,6 +266,9 @@ struct fuse_conn {
/** Is removexattr not implemented by fs? */
unsigned no_removexattr : 1;
/** Is access not implemented by fs? */
unsigned no_access : 1;
/** Backing dev info */
struct backing_dev_info bdi;
};

8
include/linux/fuse.h
View File

@ -99,7 +99,8 @@ enum fuse_opcode {
FUSE_OPENDIR = 27,
FUSE_READDIR = 28,
FUSE_RELEASEDIR = 29,
FUSE_FSYNCDIR = 30
FUSE_FSYNCDIR = 30,
FUSE_ACCESS = 34
};
/* Conservative buffer size for the client */
@ -222,6 +223,11 @@ struct fuse_getxattr_out {
__u32 padding;
};
struct fuse_access_in {
__u32 mask;
__u32 padding;
};
struct fuse_init_in_out {
__u32 major;
__u32 minor;