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ovl: mount: change order of initialization 

Move allocation of root entry above to where it's needed.

Move initializations related to upperdir and workdir near each other.

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
This commit is contained in:
Miklos Szeredi 2014-12-13 00:59:48 +01:00
parent 4ebc581828
commit 3b7a9a249a
1 changed files with 34 additions and 40 deletions
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74
fs/overlayfs/super.c
View File

@ -723,7 +723,6 @@ static int ovl_fill_super(struct super_block *sb, void *data, int silent)
struct path lowerpath;
struct path upperpath;
struct path workpath;
struct inode *root_inode;
struct dentry *root_dentry;
struct ovl_entry *oe;
struct ovl_fs *ufs;
@ -749,54 +748,49 @@ static int ovl_fill_super(struct super_block *sb, void *data, int silent)
goto out_free_config;
}
err = -ENOMEM;
oe = ovl_alloc_entry(1);
if (oe == NULL)
goto out_free_config;
err = ovl_mount_dir(ufs->config.upperdir, &upperpath);
if (err)
goto out_free_oe;
err = ovl_mount_dir(ufs->config.lowerdir, &lowerpath);
if (err)
goto out_put_upperpath;
goto out_free_config;
err = ovl_mount_dir(ufs->config.workdir, &workpath);
if (err)
goto out_put_lowerpath;
goto out_put_upperpath;
err = ovl_mount_dir(ufs->config.lowerdir, &lowerpath);
if (err)
goto out_put_workpath;
err = -EINVAL;
if (!S_ISDIR(upperpath.dentry->d_inode->i_mode) ||
!S_ISDIR(lowerpath.dentry->d_inode->i_mode) ||
!S_ISDIR(workpath.dentry->d_inode->i_mode)) {
pr_err("overlayfs: upperdir or lowerdir or workdir not a directory\n");
goto out_put_workpath;
goto out_put_lowerpath;
}
if (upperpath.mnt != workpath.mnt) {
pr_err("overlayfs: workdir and upperdir must reside under the same mount\n");
goto out_put_workpath;
goto out_put_lowerpath;
}
if (!ovl_workdir_ok(workpath.dentry, upperpath.dentry)) {
pr_err("overlayfs: workdir and upperdir must be separate subtrees\n");
goto out_put_workpath;
goto out_put_lowerpath;
}
if (!ovl_is_allowed_fs_type(upperpath.dentry)) {
pr_err("overlayfs: filesystem of upperdir is not supported\n");
goto out_put_workpath;
goto out_put_lowerpath;
}
if (!ovl_is_allowed_fs_type(lowerpath.dentry)) {
pr_err("overlayfs: filesystem of lowerdir is not supported\n");
goto out_put_workpath;
goto out_put_lowerpath;
}
err = vfs_statfs(&lowerpath, &statfs);
if (err) {
pr_err("overlayfs: statfs failed on lowerpath\n");
goto out_put_workpath;
goto out_put_lowerpath;
}
ufs->lower_namelen = statfs.f_namelen;
@ -806,19 +800,27 @@ static int ovl_fill_super(struct super_block *sb, void *data, int silent)
err = -EINVAL;
if (sb->s_stack_depth > FILESYSTEM_MAX_STACK_DEPTH) {
pr_err("overlayfs: maximum fs stacking depth exceeded\n");
goto out_put_workpath;
goto out_put_lowerpath;
}
ufs->upper_mnt = clone_private_mount(&upperpath);
err = PTR_ERR(ufs->upper_mnt);
if (IS_ERR(ufs->upper_mnt)) {
pr_err("overlayfs: failed to clone upperpath\n");
goto out_put_workpath;
goto out_put_lowerpath;
}
ufs->workdir = ovl_workdir_create(ufs->upper_mnt, workpath.dentry);
err = PTR_ERR(ufs->workdir);
if (IS_ERR(ufs->workdir)) {
pr_err("overlayfs: failed to create directory %s/%s\n",
ufs->config.workdir, OVL_WORKDIR_NAME);
goto out_put_upper_mnt;
}
ufs->lower_mnt = kcalloc(1, sizeof(struct vfsmount *), GFP_KERNEL);
if (ufs->lower_mnt == NULL)
goto out_put_upper_mnt;
goto out_put_workdir;
mnt = clone_private_mount(&lowerpath);
err = PTR_ERR(mnt);
@ -835,14 +837,6 @@ static int ovl_fill_super(struct super_block *sb, void *data, int silent)
ufs->lower_mnt[0] = mnt;
ufs->numlower = 1;
ufs->workdir = ovl_workdir_create(ufs->upper_mnt, workpath.dentry);
err = PTR_ERR(ufs->workdir);
if (IS_ERR(ufs->workdir)) {
pr_err("overlayfs: failed to create directory %s/%s\n",
ufs->config.workdir, OVL_WORKDIR_NAME);
goto out_put_lower_mnt;
}
/* If the upper fs is r/o, we mark overlayfs r/o too */
if (ufs->upper_mnt->mnt_sb->s_flags & MS_RDONLY)
sb->s_flags |= MS_RDONLY;
@ -850,13 +844,13 @@ static int ovl_fill_super(struct super_block *sb, void *data, int silent)
sb->s_d_op = &ovl_dentry_operations;
err = -ENOMEM;
root_inode = ovl_new_inode(sb, S_IFDIR, oe);
if (!root_inode)
goto out_put_workdir;
oe = ovl_alloc_entry(1);
if (!oe)
goto out_put_lower_mnt;
root_dentry = d_make_root(root_inode);
root_dentry = d_make_root(ovl_new_inode(sb, S_IFDIR, oe));
if (!root_dentry)
goto out_put_workdir;
goto out_free_oe;
mntput(upperpath.mnt);
mntput(lowerpath.mnt);
@ -875,22 +869,22 @@ static int ovl_fill_super(struct super_block *sb, void *data, int silent)
return 0;
out_put_workdir:
dput(ufs->workdir);
out_free_oe:
kfree(oe);
out_put_lower_mnt:
for (i = 0; i < ufs->numlower; i++)
mntput(ufs->lower_mnt[i]);
kfree(ufs->lower_mnt);
out_put_workdir:
dput(ufs->workdir);
out_put_upper_mnt:
mntput(ufs->upper_mnt);
out_put_workpath:
path_put(&workpath);
out_put_lowerpath:
path_put(&lowerpath);
out_put_workpath:
path_put(&workpath);
out_put_upperpath:
path_put(&upperpath);
out_free_oe:
kfree(oe);
out_free_config:
kfree(ufs->config.lowerdir);
kfree(ufs->config.upperdir);