ceph: include the initial ACL in create/mkdir/mknod MDS requests
Current code set new file/directory's initial ACL in a non-atomic manner. Client first sends request to MDS to create new file/directory, then set the initial ACL after the new file/directory is successfully created. The fix is include the initial ACL in create/mkdir/mknod MDS requests. So MDS can handle creating file/directory and setting the initial ACL in one request. Signed-off-by: Yan, Zheng <zyan@redhat.com> Reviewed-by: Sage Weil <sage@redhat.com>wifi-calibration
Yan, Zheng
Sage Weil
parent
25e6bae356
commit
b1ee94aa59
127
fs/ceph/acl.c
127
fs/ceph/acl.c
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@ -169,36 +169,109 @@ out:
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return ret;
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}
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int ceph_init_acl(struct dentry *dentry, struct inode *inode, struct inode *dir)
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int ceph_pre_init_acls(struct inode *dir, umode_t *mode,
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struct ceph_acls_info *info)
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{
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struct posix_acl *default_acl, *acl;
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umode_t new_mode = inode->i_mode;
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int error;
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struct posix_acl *acl, *default_acl;
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size_t val_size1 = 0, val_size2 = 0;
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struct ceph_pagelist *pagelist = NULL;
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void *tmp_buf = NULL;
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int err;
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error = posix_acl_create(dir, &new_mode, &default_acl, &acl);
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if (error)
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return error;
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err = posix_acl_create(dir, mode, &default_acl, &acl);
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if (err)
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return err;
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if (!default_acl && !acl) {
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cache_no_acl(inode);
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if (new_mode != inode->i_mode) {
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struct iattr newattrs = {
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.ia_mode = new_mode,
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.ia_valid = ATTR_MODE,
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};
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error = ceph_setattr(dentry, &newattrs);
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}
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return error;
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}
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if (default_acl) {
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error = ceph_set_acl(inode, default_acl, ACL_TYPE_DEFAULT);
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posix_acl_release(default_acl);
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}
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if (acl) {
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if (!error)
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error = ceph_set_acl(inode, acl, ACL_TYPE_ACCESS);
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posix_acl_release(acl);
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int ret = posix_acl_equiv_mode(acl, mode);
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if (ret < 0)
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goto out_err;
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if (ret == 0) {
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posix_acl_release(acl);
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acl = NULL;
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}
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}
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return error;
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if (!default_acl && !acl)
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return 0;
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if (acl)
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val_size1 = posix_acl_xattr_size(acl->a_count);
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if (default_acl)
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val_size2 = posix_acl_xattr_size(default_acl->a_count);
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err = -ENOMEM;
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tmp_buf = kmalloc(max(val_size1, val_size2), GFP_NOFS);
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if (!tmp_buf)
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goto out_err;
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pagelist = kmalloc(sizeof(struct ceph_pagelist), GFP_NOFS);
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if (!pagelist)
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goto out_err;
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ceph_pagelist_init(pagelist);
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err = ceph_pagelist_reserve(pagelist, PAGE_SIZE);
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if (err)
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goto out_err;
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ceph_pagelist_encode_32(pagelist, acl && default_acl ? 2 : 1);
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if (acl) {
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size_t len = strlen(POSIX_ACL_XATTR_ACCESS);
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err = ceph_pagelist_reserve(pagelist, len + val_size1 + 8);
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if (err)
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goto out_err;
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ceph_pagelist_encode_string(pagelist, POSIX_ACL_XATTR_ACCESS,
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len);
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err = posix_acl_to_xattr(&init_user_ns, acl,
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tmp_buf, val_size1);
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if (err < 0)
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goto out_err;
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ceph_pagelist_encode_32(pagelist, val_size1);
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ceph_pagelist_append(pagelist, tmp_buf, val_size1);
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}
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if (default_acl) {
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size_t len = strlen(POSIX_ACL_XATTR_DEFAULT);
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err = ceph_pagelist_reserve(pagelist, len + val_size2 + 8);
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if (err)
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goto out_err;
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err = ceph_pagelist_encode_string(pagelist,
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POSIX_ACL_XATTR_DEFAULT, len);
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err = posix_acl_to_xattr(&init_user_ns, default_acl,
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tmp_buf, val_size2);
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if (err < 0)
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goto out_err;
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ceph_pagelist_encode_32(pagelist, val_size2);
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ceph_pagelist_append(pagelist, tmp_buf, val_size2);
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}
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kfree(tmp_buf);
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info->acl = acl;
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info->default_acl = default_acl;
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info->pagelist = pagelist;
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return 0;
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out_err:
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posix_acl_release(acl);
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posix_acl_release(default_acl);
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kfree(tmp_buf);
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if (pagelist)
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ceph_pagelist_release(pagelist);
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return err;
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}
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void ceph_init_inode_acls(struct inode* inode, struct ceph_acls_info *info)
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{
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if (!inode)
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return;
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ceph_set_cached_acl(inode, ACL_TYPE_ACCESS, info->acl);
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ceph_set_cached_acl(inode, ACL_TYPE_DEFAULT, info->default_acl);
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}
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void ceph_release_acls_info(struct ceph_acls_info *info)
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{
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posix_acl_release(info->acl);
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posix_acl_release(info->default_acl);
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if (info->pagelist)
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ceph_pagelist_release(info->pagelist);
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}
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@ -682,17 +682,22 @@ static int ceph_mknod(struct inode *dir, struct dentry *dentry,
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struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
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struct ceph_mds_client *mdsc = fsc->mdsc;
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struct ceph_mds_request *req;
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struct ceph_acls_info acls = {};
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int err;
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if (ceph_snap(dir) != CEPH_NOSNAP)
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return -EROFS;
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err = ceph_pre_init_acls(dir, &mode, &acls);
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if (err < 0)
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return err;
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dout("mknod in dir %p dentry %p mode 0%ho rdev %d\n",
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dir, dentry, mode, rdev);
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req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_MKNOD, USE_AUTH_MDS);
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if (IS_ERR(req)) {
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d_drop(dentry);
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return PTR_ERR(req);
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err = PTR_ERR(req);
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goto out;
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}
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req->r_dentry = dget(dentry);
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req->r_num_caps = 2;
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@ -701,15 +706,20 @@ static int ceph_mknod(struct inode *dir, struct dentry *dentry,
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req->r_args.mknod.rdev = cpu_to_le32(rdev);
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req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
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req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
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if (acls.pagelist) {
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req->r_pagelist = acls.pagelist;
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acls.pagelist = NULL;
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}
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err = ceph_mdsc_do_request(mdsc, dir, req);
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if (!err && !req->r_reply_info.head->is_dentry)
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err = ceph_handle_notrace_create(dir, dentry);
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ceph_mdsc_put_request(req);
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out:
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if (!err)
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ceph_init_acl(dentry, dentry->d_inode, dir);
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ceph_init_inode_acls(dentry->d_inode, &acls);
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else
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d_drop(dentry);
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ceph_release_acls_info(&acls);
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return err;
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}
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@ -733,8 +743,8 @@ static int ceph_symlink(struct inode *dir, struct dentry *dentry,
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dout("symlink in dir %p dentry %p to '%s'\n", dir, dentry, dest);
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req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SYMLINK, USE_AUTH_MDS);
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if (IS_ERR(req)) {
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d_drop(dentry);
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return PTR_ERR(req);
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err = PTR_ERR(req);
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goto out;
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}
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req->r_dentry = dget(dentry);
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req->r_num_caps = 2;
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@ -746,9 +756,8 @@ static int ceph_symlink(struct inode *dir, struct dentry *dentry,
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if (!err && !req->r_reply_info.head->is_dentry)
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err = ceph_handle_notrace_create(dir, dentry);
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ceph_mdsc_put_request(req);
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if (!err)
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ceph_init_acl(dentry, dentry->d_inode, dir);
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else
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out:
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if (err)
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d_drop(dentry);
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return err;
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}
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@ -758,6 +767,7 @@ static int ceph_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
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struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
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struct ceph_mds_client *mdsc = fsc->mdsc;
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struct ceph_mds_request *req;
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struct ceph_acls_info acls = {};
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int err = -EROFS;
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int op;
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@ -772,6 +782,12 @@ static int ceph_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
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} else {
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goto out;
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}
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mode |= S_IFDIR;
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err = ceph_pre_init_acls(dir, &mode, &acls);
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if (err < 0)
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goto out;
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req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
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if (IS_ERR(req)) {
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err = PTR_ERR(req);
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@ -784,15 +800,20 @@ static int ceph_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
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req->r_args.mkdir.mode = cpu_to_le32(mode);
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req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
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req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
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if (acls.pagelist) {
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req->r_pagelist = acls.pagelist;
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acls.pagelist = NULL;
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}
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err = ceph_mdsc_do_request(mdsc, dir, req);
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if (!err && !req->r_reply_info.head->is_dentry)
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err = ceph_handle_notrace_create(dir, dentry);
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ceph_mdsc_put_request(req);
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out:
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if (!err)
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ceph_init_acl(dentry, dentry->d_inode, dir);
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ceph_init_inode_acls(dentry->d_inode, &acls);
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else
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d_drop(dentry);
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ceph_release_acls_info(&acls);
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return err;
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}
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@ -235,6 +235,7 @@ int ceph_atomic_open(struct inode *dir, struct dentry *dentry,
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struct ceph_mds_client *mdsc = fsc->mdsc;
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struct ceph_mds_request *req;
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struct dentry *dn;
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struct ceph_acls_info acls = {};
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int err;
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dout("atomic_open %p dentry %p '%.*s' %s flags %d mode 0%o\n",
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@ -248,22 +249,34 @@ int ceph_atomic_open(struct inode *dir, struct dentry *dentry,
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if (err < 0)
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return err;
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if (flags & O_CREAT) {
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err = ceph_pre_init_acls(dir, &mode, &acls);
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if (err < 0)
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return err;
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}
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/* do the open */
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req = prepare_open_request(dir->i_sb, flags, mode);
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if (IS_ERR(req))
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return PTR_ERR(req);
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if (IS_ERR(req)) {
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err = PTR_ERR(req);
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goto out_acl;
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}
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req->r_dentry = dget(dentry);
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req->r_num_caps = 2;
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if (flags & O_CREAT) {
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req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
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req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
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if (acls.pagelist) {
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req->r_pagelist = acls.pagelist;
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acls.pagelist = NULL;
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}
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}
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req->r_locked_dir = dir; /* caller holds dir->i_mutex */
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err = ceph_mdsc_do_request(mdsc,
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(flags & (O_CREAT|O_TRUNC)) ? dir : NULL,
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req);
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if (err)
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goto out_err;
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goto out_req;
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err = ceph_handle_snapdir(req, dentry, err);
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if (err == 0 && (flags & O_CREAT) && !req->r_reply_info.head->is_dentry)
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@ -278,7 +291,7 @@ int ceph_atomic_open(struct inode *dir, struct dentry *dentry,
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dn = NULL;
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}
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if (err)
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goto out_err;
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goto out_req;
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if (dn || dentry->d_inode == NULL || S_ISLNK(dentry->d_inode->i_mode)) {
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/* make vfs retry on splice, ENOENT, or symlink */
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dout("atomic_open finish_no_open on dn %p\n", dn);
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@ -286,15 +299,17 @@ int ceph_atomic_open(struct inode *dir, struct dentry *dentry,
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} else {
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dout("atomic_open finish_open on dn %p\n", dn);
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if (req->r_op == CEPH_MDS_OP_CREATE && req->r_reply_info.has_create_ino) {
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ceph_init_acl(dentry, dentry->d_inode, dir);
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ceph_init_inode_acls(dentry->d_inode, &acls);
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*opened |= FILE_CREATED;
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}
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err = finish_open(file, dentry, ceph_open, opened);
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}
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out_err:
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out_req:
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if (!req->r_err && req->r_target_inode)
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ceph_put_fmode(ceph_inode(req->r_target_inode), req->r_fmode);
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ceph_mdsc_put_request(req);
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out_acl:
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ceph_release_acls_info(&acls);
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dout("atomic_open result=%d\n", err);
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return err;
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}
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@ -733,15 +733,23 @@ extern void __ceph_build_xattrs_blob(struct ceph_inode_info *ci);
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extern void __ceph_destroy_xattrs(struct ceph_inode_info *ci);
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extern void __init ceph_xattr_init(void);
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extern void ceph_xattr_exit(void);
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extern const struct xattr_handler *ceph_xattr_handlers[];
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/* acl.c */
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extern const struct xattr_handler *ceph_xattr_handlers[];
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struct ceph_acls_info {
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void *default_acl;
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void *acl;
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struct ceph_pagelist *pagelist;
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};
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#ifdef CONFIG_CEPH_FS_POSIX_ACL
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struct posix_acl *ceph_get_acl(struct inode *, int);
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int ceph_set_acl(struct inode *inode, struct posix_acl *acl, int type);
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int ceph_init_acl(struct dentry *, struct inode *, struct inode *);
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int ceph_pre_init_acls(struct inode *dir, umode_t *mode,
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struct ceph_acls_info *info);
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void ceph_init_inode_acls(struct inode *inode, struct ceph_acls_info *info);
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void ceph_release_acls_info(struct ceph_acls_info *info);
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static inline void ceph_forget_all_cached_acls(struct inode *inode)
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{
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@ -753,12 +761,18 @@ static inline void ceph_forget_all_cached_acls(struct inode *inode)
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#define ceph_get_acl NULL
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#define ceph_set_acl NULL
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static inline int ceph_init_acl(struct dentry *dentry, struct inode *inode,
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struct inode *dir)
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static inline int ceph_pre_init_acls(struct inode *dir, umode_t *mode,
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struct ceph_acls_info *info)
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{
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return 0;
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}
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static inline void ceph_init_inode_acls(struct inode *inode,
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struct ceph_acls_info *info)
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{
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}
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static inline void ceph_release_acls_info(struct ceph_acls_info *info)
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{
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}
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static inline int ceph_acl_chmod(struct dentry *dentry, struct inode *inode)
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{
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return 0;
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