[PATCH] FUSE - extended attribute operations
This patch adds the extended attribute operations to FUSE.
The following operations are added:
o getxattr
o setxattr
o listxattr
o removexattr
Signed-off-by: Miklos Szeredi <miklos@szeredi.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c
index 0950455..f127625 100644
--- a/fs/fuse/dir.c
+++ b/fs/fuse/dir.c
@@ -744,6 +744,177 @@
return d_splice_alias(inode, entry);
}
+static int fuse_setxattr(struct dentry *entry, const char *name,
+ const void *value, size_t size, int flags)
+{
+ struct inode *inode = entry->d_inode;
+ struct fuse_conn *fc = get_fuse_conn(inode);
+ struct fuse_req *req;
+ struct fuse_setxattr_in inarg;
+ int err;
+
+ if (size > FUSE_XATTR_SIZE_MAX)
+ return -E2BIG;
+
+ if (fc->no_setxattr)
+ return -EOPNOTSUPP;
+
+ req = fuse_get_request(fc);
+ if (!req)
+ return -ERESTARTNOINTR;
+
+ memset(&inarg, 0, sizeof(inarg));
+ inarg.size = size;
+ inarg.flags = flags;
+ req->in.h.opcode = FUSE_SETXATTR;
+ req->in.h.nodeid = get_node_id(inode);
+ req->inode = inode;
+ req->in.numargs = 3;
+ req->in.args[0].size = sizeof(inarg);
+ req->in.args[0].value = &inarg;
+ req->in.args[1].size = strlen(name) + 1;
+ req->in.args[1].value = name;
+ req->in.args[2].size = size;
+ req->in.args[2].value = value;
+ request_send(fc, req);
+ err = req->out.h.error;
+ fuse_put_request(fc, req);
+ if (err == -ENOSYS) {
+ fc->no_setxattr = 1;
+ err = -EOPNOTSUPP;
+ }
+ return err;
+}
+
+static ssize_t fuse_getxattr(struct dentry *entry, const char *name,
+ void *value, size_t size)
+{
+ struct inode *inode = entry->d_inode;
+ struct fuse_conn *fc = get_fuse_conn(inode);
+ struct fuse_req *req;
+ struct fuse_getxattr_in inarg;
+ struct fuse_getxattr_out outarg;
+ ssize_t ret;
+
+ if (fc->no_getxattr)
+ return -EOPNOTSUPP;
+
+ req = fuse_get_request(fc);
+ if (!req)
+ return -ERESTARTNOINTR;
+
+ memset(&inarg, 0, sizeof(inarg));
+ inarg.size = size;
+ req->in.h.opcode = FUSE_GETXATTR;
+ req->in.h.nodeid = get_node_id(inode);
+ req->inode = inode;
+ req->in.numargs = 2;
+ req->in.args[0].size = sizeof(inarg);
+ req->in.args[0].value = &inarg;
+ req->in.args[1].size = strlen(name) + 1;
+ req->in.args[1].value = name;
+ /* This is really two different operations rolled into one */
+ req->out.numargs = 1;
+ if (size) {
+ req->out.argvar = 1;
+ req->out.args[0].size = size;
+ req->out.args[0].value = value;
+ } else {
+ req->out.args[0].size = sizeof(outarg);
+ req->out.args[0].value = &outarg;
+ }
+ request_send(fc, req);
+ ret = req->out.h.error;
+ if (!ret)
+ ret = size ? req->out.args[0].size : outarg.size;
+ else {
+ if (ret == -ENOSYS) {
+ fc->no_getxattr = 1;
+ ret = -EOPNOTSUPP;
+ }
+ }
+ fuse_put_request(fc, req);
+ return ret;
+}
+
+static ssize_t fuse_listxattr(struct dentry *entry, char *list, size_t size)
+{
+ struct inode *inode = entry->d_inode;
+ struct fuse_conn *fc = get_fuse_conn(inode);
+ struct fuse_req *req;
+ struct fuse_getxattr_in inarg;
+ struct fuse_getxattr_out outarg;
+ ssize_t ret;
+
+ if (fc->no_listxattr)
+ return -EOPNOTSUPP;
+
+ req = fuse_get_request(fc);
+ if (!req)
+ return -ERESTARTNOINTR;
+
+ memset(&inarg, 0, sizeof(inarg));
+ inarg.size = size;
+ req->in.h.opcode = FUSE_LISTXATTR;
+ 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;
+ /* This is really two different operations rolled into one */
+ req->out.numargs = 1;
+ if (size) {
+ req->out.argvar = 1;
+ req->out.args[0].size = size;
+ req->out.args[0].value = list;
+ } else {
+ req->out.args[0].size = sizeof(outarg);
+ req->out.args[0].value = &outarg;
+ }
+ request_send(fc, req);
+ ret = req->out.h.error;
+ if (!ret)
+ ret = size ? req->out.args[0].size : outarg.size;
+ else {
+ if (ret == -ENOSYS) {
+ fc->no_listxattr = 1;
+ ret = -EOPNOTSUPP;
+ }
+ }
+ fuse_put_request(fc, req);
+ return ret;
+}
+
+static int fuse_removexattr(struct dentry *entry, const char *name)
+{
+ struct inode *inode = entry->d_inode;
+ struct fuse_conn *fc = get_fuse_conn(inode);
+ struct fuse_req *req;
+ int err;
+
+ if (fc->no_removexattr)
+ return -EOPNOTSUPP;
+
+ req = fuse_get_request(fc);
+ if (!req)
+ return -ERESTARTNOINTR;
+
+ req->in.h.opcode = FUSE_REMOVEXATTR;
+ req->in.h.nodeid = get_node_id(inode);
+ req->inode = inode;
+ req->in.numargs = 1;
+ req->in.args[0].size = strlen(name) + 1;
+ req->in.args[0].value = name;
+ request_send(fc, req);
+ err = req->out.h.error;
+ fuse_put_request(fc, req);
+ if (err == -ENOSYS) {
+ fc->no_removexattr = 1;
+ err = -EOPNOTSUPP;
+ }
+ return err;
+}
+
static struct inode_operations fuse_dir_inode_operations = {
.lookup = fuse_lookup,
.mkdir = fuse_mkdir,
@@ -757,6 +928,10 @@
.mknod = fuse_mknod,
.permission = fuse_permission,
.getattr = fuse_getattr,
+ .setxattr = fuse_setxattr,
+ .getxattr = fuse_getxattr,
+ .listxattr = fuse_listxattr,
+ .removexattr = fuse_removexattr,
};
static struct file_operations fuse_dir_operations = {
@@ -771,6 +946,10 @@
.setattr = fuse_setattr,
.permission = fuse_permission,
.getattr = fuse_getattr,
+ .setxattr = fuse_setxattr,
+ .getxattr = fuse_getxattr,
+ .listxattr = fuse_listxattr,
+ .removexattr = fuse_removexattr,
};
static struct inode_operations fuse_symlink_inode_operations = {
@@ -779,6 +958,10 @@
.put_link = fuse_put_link,
.readlink = generic_readlink,
.getattr = fuse_getattr,
+ .setxattr = fuse_setxattr,
+ .getxattr = fuse_getxattr,
+ .listxattr = fuse_listxattr,
+ .removexattr = fuse_removexattr,
};
void fuse_init_common(struct inode *inode)