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Commit ad204488 authored by Miklos Szeredi's avatar Miklos Szeredi
Browse files

ovl: rename ufs to ofs 



Rename all "struct ovl_fs" pointers to "ofs".  The "ufs" name is historical
and can only be found in overlayfs/super.c.

Signed-off-by: default avatarMiklos Szeredi <mszeredi@redhat.com>
parent 4155c10a

fs/overlayfs/super.c

+114 −114
Original line number Diff line number Diff line
@@ -211,30 +211,30 @@ static void ovl_destroy_inode(struct inode *inode) 
	call_rcu(&inode->i_rcu, ovl_i_callback);

}



static void ovl_free_fs(struct ovl_fs *ufs)

static void ovl_free_fs(struct ovl_fs *ofs)

{

	unsigned i;



	dput(ufs->indexdir);

	dput(ufs->workdir);

	if (ufs->workdir_locked)

		ovl_inuse_unlock(ufs->workbasedir);

	dput(ufs->workbasedir);

	if (ufs->upperdir_locked)

		ovl_inuse_unlock(ufs->upper_mnt->mnt_root);

	mntput(ufs->upper_mnt);

	for (i = 0; i < ufs->numlower; i++) {

		mntput(ufs->lower_layers[i].mnt);

		free_anon_bdev(ufs->lower_layers[i].pseudo_dev);

	dput(ofs->indexdir);

	dput(ofs->workdir);

	if (ofs->workdir_locked)

		ovl_inuse_unlock(ofs->workbasedir);

	dput(ofs->workbasedir);

	if (ofs->upperdir_locked)

		ovl_inuse_unlock(ofs->upper_mnt->mnt_root);

	mntput(ofs->upper_mnt);

	for (i = 0; i < ofs->numlower; i++) {

		mntput(ofs->lower_layers[i].mnt);

		free_anon_bdev(ofs->lower_layers[i].pseudo_dev);

	}

	kfree(ufs->lower_layers);

	kfree(ofs->lower_layers);



	kfree(ufs->config.lowerdir);

	kfree(ufs->config.upperdir);

	kfree(ufs->config.workdir);

	if (ufs->creator_cred)

		put_cred(ufs->creator_cred);

	kfree(ufs);

	kfree(ofs->config.lowerdir);

	kfree(ofs->config.upperdir);

	kfree(ofs->config.workdir);

	if (ofs->creator_cred)

		put_cred(ofs->creator_cred);

	kfree(ofs);

}



static void ovl_put_super(struct super_block *sb)
@@ -246,13 +246,13 @@ static void ovl_put_super(struct super_block *sb) 


static int ovl_sync_fs(struct super_block *sb, int wait)

{

	struct ovl_fs *ufs = sb->s_fs_info;

	struct ovl_fs *ofs = sb->s_fs_info;

	struct super_block *upper_sb;

	int ret;



	if (!ufs->upper_mnt)

	if (!ofs->upper_mnt)

		return 0;

	upper_sb = ufs->upper_mnt->mnt_sb;

	upper_sb = ofs->upper_mnt->mnt_sb;

	if (!upper_sb->s_op->sync_fs)

		return 0;
@@ -290,9 +290,9 @@ static int ovl_statfs(struct dentry *dentry, struct kstatfs *buf) 
}



/* Will this overlay be forced to mount/remount ro? */

static bool ovl_force_readonly(struct ovl_fs *ufs)

static bool ovl_force_readonly(struct ovl_fs *ofs)

{

	return (!ufs->upper_mnt || !ufs->workdir);

	return (!ofs->upper_mnt || !ofs->workdir);

}



/**
@@ -304,29 +304,29 @@ static bool ovl_force_readonly(struct ovl_fs *ufs) 
static int ovl_show_options(struct seq_file *m, struct dentry *dentry)

{

	struct super_block *sb = dentry->d_sb;

	struct ovl_fs *ufs = sb->s_fs_info;

	struct ovl_fs *ofs = sb->s_fs_info;



	seq_show_option(m, "lowerdir", ufs->config.lowerdir);

	if (ufs->config.upperdir) {

		seq_show_option(m, "upperdir", ufs->config.upperdir);

		seq_show_option(m, "workdir", ufs->config.workdir);

	seq_show_option(m, "lowerdir", ofs->config.lowerdir);

	if (ofs->config.upperdir) {

		seq_show_option(m, "upperdir", ofs->config.upperdir);

		seq_show_option(m, "workdir", ofs->config.workdir);

	}

	if (ufs->config.default_permissions)

	if (ofs->config.default_permissions)

		seq_puts(m, ",default_permissions");

	if (ufs->config.redirect_dir != ovl_redirect_dir_def)

	if (ofs->config.redirect_dir != ovl_redirect_dir_def)

		seq_printf(m, ",redirect_dir=%s",

			   ufs->config.redirect_dir ? "on" : "off");

	if (ufs->config.index != ovl_index_def)

			   ofs->config.redirect_dir ? "on" : "off");

	if (ofs->config.index != ovl_index_def)

		seq_printf(m, ",index=%s",

			   ufs->config.index ? "on" : "off");

			   ofs->config.index ? "on" : "off");

	return 0;

}



static int ovl_remount(struct super_block *sb, int *flags, char *data)

{

	struct ovl_fs *ufs = sb->s_fs_info;

	struct ovl_fs *ofs = sb->s_fs_info;



	if (!(*flags & MS_RDONLY) && ovl_force_readonly(ufs))

	if (!(*flags & MS_RDONLY) && ovl_force_readonly(ofs))

		return -EROFS;



	return 0;
@@ -464,11 +464,11 @@ static int ovl_parse_opt(char *opt, struct ovl_config *config) 
#define OVL_WORKDIR_NAME "work"

#define OVL_INDEXDIR_NAME "index"



static struct dentry *ovl_workdir_create(struct ovl_fs *ufs,

static struct dentry *ovl_workdir_create(struct ovl_fs *ofs,

					 const char *name, bool persist)

{

	struct inode *dir =  ufs->workbasedir->d_inode;

	struct vfsmount *mnt = ufs->upper_mnt;

	struct inode *dir =  ofs->workbasedir->d_inode;

	struct vfsmount *mnt = ofs->upper_mnt;

	struct dentry *work;

	int err;

	bool retried = false;
@@ -482,7 +482,7 @@ static struct dentry *ovl_workdir_create(struct ovl_fs *ufs, 
	locked = true;



retry:

	work = lookup_one_len(name, ufs->workbasedir, strlen(name));

	work = lookup_one_len(name, ofs->workbasedir, strlen(name));



	if (!IS_ERR(work)) {

		struct iattr attr = {
@@ -552,7 +552,7 @@ static struct dentry *ovl_workdir_create(struct ovl_fs *ufs, 
	dput(work);

out_err:

	pr_warn("overlayfs: failed to create directory %s/%s (errno: %i); mounting read-only\n",

		ufs->config.workdir, name, -err);

		ofs->config.workdir, name, -err);

	work = NULL;

	goto out_unlock;

}
@@ -836,12 +836,12 @@ static const struct xattr_handler *ovl_xattr_handlers[] = { 
	NULL

};



static int ovl_get_upper(struct ovl_fs *ufs, struct path *upperpath)

static int ovl_get_upper(struct ovl_fs *ofs, struct path *upperpath)

{

	struct vfsmount *upper_mnt;

	int err;



	err = ovl_mount_dir(ufs->config.upperdir, upperpath);

	err = ovl_mount_dir(ofs->config.upperdir, upperpath);

	if (err)

		goto out;
@@ -852,14 +852,14 @@ static int ovl_get_upper(struct ovl_fs *ufs, struct path *upperpath) 
		goto out;

	}



	err = ovl_check_namelen(upperpath, ufs, ufs->config.upperdir);

	err = ovl_check_namelen(upperpath, ofs, ofs->config.upperdir);

	if (err)

		goto out;



	err = -EBUSY;

	if (ovl_inuse_trylock(upperpath->dentry)) {

		ufs->upperdir_locked = true;

	} else if (ufs->config.index) {

		ofs->upperdir_locked = true;

	} else if (ofs->config.index) {

		pr_err("overlayfs: upperdir is in-use by another mount, mount with '-o index=off' to override exclusive upperdir protection.\n");

		goto out;

	} else {
@@ -875,19 +875,19 @@ static int ovl_get_upper(struct ovl_fs *ufs, struct path *upperpath) 


	/* Don't inherit atime flags */

	upper_mnt->mnt_flags &= ~(MNT_NOATIME | MNT_NODIRATIME | MNT_RELATIME);

	ufs->upper_mnt = upper_mnt;

	ofs->upper_mnt = upper_mnt;

	err = 0;

out:

	return err;

}



static int ovl_make_workdir(struct ovl_fs *ufs, struct path *workpath)

static int ovl_make_workdir(struct ovl_fs *ofs, struct path *workpath)

{

	struct dentry *temp;

	int err;



	ufs->workdir = ovl_workdir_create(ufs, OVL_WORKDIR_NAME, false);

	if (!ufs->workdir)

	ofs->workdir = ovl_workdir_create(ofs, OVL_WORKDIR_NAME, false);

	if (!ofs->workdir)

		return 0;



	/*
@@ -908,9 +908,9 @@ static int ovl_make_workdir(struct ovl_fs *ufs, struct path *workpath) 
		pr_warn("overlayfs: upper fs needs to support d_type.\n");



	/* Check if upper/work fs supports O_TMPFILE */

	temp = ovl_do_tmpfile(ufs->workdir, S_IFREG | 0);

	ufs->tmpfile = !IS_ERR(temp);

	if (ufs->tmpfile)

	temp = ovl_do_tmpfile(ofs->workdir, S_IFREG | 0);

	ofs->tmpfile = !IS_ERR(temp);

	if (ofs->tmpfile)

		dput(temp);

	else

		pr_warn("overlayfs: upper fs does not support tmpfile.\n");
@@ -918,30 +918,30 @@ static int ovl_make_workdir(struct ovl_fs *ufs, struct path *workpath) 
	/*

	 * Check if upper/work fs supports trusted.overlay.* xattr

	 */

	err = ovl_do_setxattr(ufs->workdir, OVL_XATTR_OPAQUE, "0", 1, 0);

	err = ovl_do_setxattr(ofs->workdir, OVL_XATTR_OPAQUE, "0", 1, 0);

	if (err) {

		ufs->noxattr = true;

		ofs->noxattr = true;

		pr_warn("overlayfs: upper fs does not support xattr.\n");

	} else {

		vfs_removexattr(ufs->workdir, OVL_XATTR_OPAQUE);

		vfs_removexattr(ofs->workdir, OVL_XATTR_OPAQUE);

	}



	/* Check if upper/work fs supports file handles */

	if (ufs->config.index &&

	    !ovl_can_decode_fh(ufs->workdir->d_sb)) {

		ufs->config.index = false;

	if (ofs->config.index &&

	    !ovl_can_decode_fh(ofs->workdir->d_sb)) {

		ofs->config.index = false;

		pr_warn("overlayfs: upper fs does not support file handles, falling back to index=off.\n");

	}



	return 0;

}



static int ovl_get_workdir(struct ovl_fs *ufs, struct path *upperpath)

static int ovl_get_workdir(struct ovl_fs *ofs, struct path *upperpath)

{

	int err;

	struct path workpath = { };



	err = ovl_mount_dir(ufs->config.workdir, &workpath);

	err = ovl_mount_dir(ofs->config.workdir, &workpath);

	if (err)

		goto out;
@@ -957,16 +957,16 @@ static int ovl_get_workdir(struct ovl_fs *ufs, struct path *upperpath) 


	err = -EBUSY;

	if (ovl_inuse_trylock(workpath.dentry)) {

		ufs->workdir_locked = true;

	} else if (ufs->config.index) {

		ofs->workdir_locked = true;

	} else if (ofs->config.index) {

		pr_err("overlayfs: workdir is in-use by another mount, mount with '-o index=off' to override exclusive workdir protection.\n");

		goto out;

	} else {

		pr_warn("overlayfs: workdir is in-use by another mount, accessing files from both mounts will result in undefined behavior.\n");

	}



	ufs->workbasedir = dget(workpath.dentry);

	err = ovl_make_workdir(ufs, &workpath);

	ofs->workbasedir = dget(workpath.dentry);

	err = ovl_make_workdir(ofs, &workpath);

	if (err)

		goto out;
@@ -977,7 +977,7 @@ static int ovl_get_workdir(struct ovl_fs *ufs, struct path *upperpath) 
	return err;

}



static int ovl_get_indexdir(struct ovl_fs *ufs, struct ovl_entry *oe,

static int ovl_get_indexdir(struct ovl_fs *ofs, struct ovl_entry *oe,

			    struct path *upperpath)

{

	int err;
@@ -992,38 +992,38 @@ static int ovl_get_indexdir(struct ovl_fs *ufs, struct ovl_entry *oe, 
		goto out;

	}



	ufs->indexdir = ovl_workdir_create(ufs, OVL_INDEXDIR_NAME, true);

	if (ufs->indexdir) {

	ofs->indexdir = ovl_workdir_create(ofs, OVL_INDEXDIR_NAME, true);

	if (ofs->indexdir) {

		/* Verify upper root is index dir origin */

		err = ovl_verify_origin(ufs->indexdir, ufs->upper_mnt,

		err = ovl_verify_origin(ofs->indexdir, ofs->upper_mnt,

					upperpath->dentry, true, true);

		if (err)

			pr_err("overlayfs: failed to verify index dir origin\n");



		/* Cleanup bad/stale/orphan index entries */

		if (!err)

			err = ovl_indexdir_cleanup(ufs->indexdir,

						   ufs->upper_mnt,

			err = ovl_indexdir_cleanup(ofs->indexdir,

						   ofs->upper_mnt,

						   oe->lowerstack,

						   oe->numlower);

	}

	if (err || !ufs->indexdir)

	if (err || !ofs->indexdir)

		pr_warn("overlayfs: try deleting index dir or mounting with '-o index=off' to disable inodes index.\n");



out:

	return err;

}



static int ovl_get_lower_layers(struct ovl_fs *ufs, struct path *stack,

static int ovl_get_lower_layers(struct ovl_fs *ofs, struct path *stack,

				unsigned int numlower)

{

	int err;

	unsigned int i;



	err = -ENOMEM;

	ufs->lower_layers = kcalloc(numlower, sizeof(struct ovl_layer),

	ofs->lower_layers = kcalloc(numlower, sizeof(struct ovl_layer),

				    GFP_KERNEL);

	if (ufs->lower_layers == NULL)

	if (ofs->lower_layers == NULL)

		goto out;

	for (i = 0; i < numlower; i++) {

		struct vfsmount *mnt;
@@ -1048,15 +1048,15 @@ static int ovl_get_lower_layers(struct ovl_fs *ufs, struct path *stack, 
		 */

		mnt->mnt_flags |= MNT_READONLY | MNT_NOATIME;



		ufs->lower_layers[ufs->numlower].mnt = mnt;

		ufs->lower_layers[ufs->numlower].pseudo_dev = dev;

		ufs->numlower++;

		ofs->lower_layers[ofs->numlower].mnt = mnt;

		ofs->lower_layers[ofs->numlower].pseudo_dev = dev;

		ofs->numlower++;



		/* Check if all lower layers are on same sb */

		if (i == 0)

			ufs->same_sb = mnt->mnt_sb;

		else if (ufs->same_sb != mnt->mnt_sb)

			ufs->same_sb = NULL;

			ofs->same_sb = mnt->mnt_sb;

		else if (ofs->same_sb != mnt->mnt_sb)

			ofs->same_sb = NULL;

	}

	err = 0;

out:
@@ -1064,7 +1064,7 @@ static int ovl_get_lower_layers(struct ovl_fs *ufs, struct path *stack, 
}



static struct ovl_entry *ovl_get_lowerstack(struct super_block *sb,

					    struct ovl_fs *ufs)

					    struct ovl_fs *ofs)

{

	int err;

	char *lowertmp, *lower;
@@ -1074,7 +1074,7 @@ static struct ovl_entry *ovl_get_lowerstack(struct super_block *sb, 
	struct ovl_entry *oe;



	err = -ENOMEM;

	lowertmp = kstrdup(ufs->config.lowerdir, GFP_KERNEL);

	lowertmp = kstrdup(ofs->config.lowerdir, GFP_KERNEL);

	if (!lowertmp)

		goto out_err;
@@ -1084,7 +1084,7 @@ static struct ovl_entry *ovl_get_lowerstack(struct super_block *sb, 
		pr_err("overlayfs: too many lower directories, limit is %d\n",

		       OVL_MAX_STACK);

		goto out_err;

	} else if (!ufs->config.upperdir && stacklen == 1) {

	} else if (!ofs->config.upperdir && stacklen == 1) {

		pr_err("overlayfs: at least 2 lowerdir are needed while upperdir nonexistent\n");

		goto out_err;

	}
@@ -1097,7 +1097,7 @@ static struct ovl_entry *ovl_get_lowerstack(struct super_block *sb, 
	err = -EINVAL;

	lower = lowertmp;

	for (numlower = 0; numlower < stacklen; numlower++) {

		err = ovl_lower_dir(lower, &stack[numlower], ufs,

		err = ovl_lower_dir(lower, &stack[numlower], ofs,

				    &sb->s_stack_depth, &remote);

		if (err)

			goto out_err;
@@ -1112,7 +1112,7 @@ static struct ovl_entry *ovl_get_lowerstack(struct super_block *sb, 
		goto out_err;

	}



	err = ovl_get_lower_layers(ufs, stack, numlower);

	err = ovl_get_lower_layers(ofs, stack, numlower);

	if (err)

		goto out_err;
@@ -1123,7 +1123,7 @@ static struct ovl_entry *ovl_get_lowerstack(struct super_block *sb, 


	for (i = 0; i < numlower; i++) {

		oe->lowerstack[i].dentry = dget(stack[i].dentry);

		oe->lowerstack[i].layer = &ufs->lower_layers[i];

		oe->lowerstack[i].layer = &ofs->lower_layers[i];

	}



	if (remote)
@@ -1149,27 +1149,27 @@ static int ovl_fill_super(struct super_block *sb, void *data, int silent) 
	struct path upperpath = { };

	struct dentry *root_dentry;

	struct ovl_entry *oe;

	struct ovl_fs *ufs;

	struct ovl_fs *ofs;

	struct cred *cred;

	int err;



	err = -ENOMEM;

	ufs = kzalloc(sizeof(struct ovl_fs), GFP_KERNEL);

	if (!ufs)

	ofs = kzalloc(sizeof(struct ovl_fs), GFP_KERNEL);

	if (!ofs)

		goto out;



	ufs->creator_cred = cred = prepare_creds();

	ofs->creator_cred = cred = prepare_creds();

	if (!cred)

		goto out_err;



	ufs->config.redirect_dir = ovl_redirect_dir_def;

	ufs->config.index = ovl_index_def;

	err = ovl_parse_opt((char *) data, &ufs->config);

	ofs->config.redirect_dir = ovl_redirect_dir_def;

	ofs->config.index = ovl_index_def;

	err = ovl_parse_opt((char *) data, &ofs->config);

	if (err)

		goto out_err;



	err = -EINVAL;

	if (!ufs->config.lowerdir) {

	if (!ofs->config.lowerdir) {

		if (!silent)

			pr_err("overlayfs: missing 'lowerdir'\n");

		goto out_err;
@@ -1177,50 +1177,50 @@ static int ovl_fill_super(struct super_block *sb, void *data, int silent) 


	sb->s_stack_depth = 0;

	sb->s_maxbytes = MAX_LFS_FILESIZE;

	if (ufs->config.upperdir) {

		if (!ufs->config.workdir) {

	if (ofs->config.upperdir) {

		if (!ofs->config.workdir) {

			pr_err("overlayfs: missing 'workdir'\n");

			goto out_err;

		}



		err = ovl_get_upper(ufs, &upperpath);

		err = ovl_get_upper(ofs, &upperpath);

		if (err)

			goto out_err;



		err = ovl_get_workdir(ufs, &upperpath);

		err = ovl_get_workdir(ofs, &upperpath);

		if (err)

			goto out_err;



		if (!ufs->workdir)

		if (!ofs->workdir)

			sb->s_flags |= MS_RDONLY;



		sb->s_stack_depth = ufs->upper_mnt->mnt_sb->s_stack_depth;

		sb->s_time_gran = ufs->upper_mnt->mnt_sb->s_time_gran;

		sb->s_stack_depth = ofs->upper_mnt->mnt_sb->s_stack_depth;

		sb->s_time_gran = ofs->upper_mnt->mnt_sb->s_time_gran;



	}

	oe = ovl_get_lowerstack(sb, ufs);

	oe = ovl_get_lowerstack(sb, ofs);

	err = PTR_ERR(oe);

	if (IS_ERR(oe))

		goto out_err;



	/* If the upper fs is nonexistent, we mark overlayfs r/o too */

	if (!ufs->upper_mnt)

	if (!ofs->upper_mnt)

		sb->s_flags |= MS_RDONLY;

	else if (ufs->upper_mnt->mnt_sb != ufs->same_sb)

		ufs->same_sb = NULL;

	else if (ofs->upper_mnt->mnt_sb != ofs->same_sb)

		ofs->same_sb = NULL;



	if (!(ovl_force_readonly(ufs)) && ufs->config.index) {

		err = ovl_get_indexdir(ufs, oe, &upperpath);

	if (!(ovl_force_readonly(ofs)) && ofs->config.index) {

		err = ovl_get_indexdir(ofs, oe, &upperpath);

		if (err)

			goto out_free_oe;



		if (!ufs->indexdir)

		if (!ofs->indexdir)

			sb->s_flags |= MS_RDONLY;

	}



	/* Show index=off/on in /proc/mounts for any of the reasons above */

	if (!ufs->indexdir)

		ufs->config.index = false;

	if (!ofs->indexdir)

		ofs->config.index = false;



	/* Never override disk quota limits or use reserved space */

	cap_lower(cred->cap_effective, CAP_SYS_RESOURCE);
@@ -1228,7 +1228,7 @@ static int ovl_fill_super(struct super_block *sb, void *data, int silent) 
	sb->s_magic = OVERLAYFS_SUPER_MAGIC;

	sb->s_op = &ovl_super_operations;

	sb->s_xattr = ovl_xattr_handlers;

	sb->s_fs_info = ufs;

	sb->s_fs_info = ofs;

	sb->s_flags |= MS_POSIXACL | MS_NOREMOTELOCK;



	err = -ENOMEM;
@@ -1259,7 +1259,7 @@ static int ovl_fill_super(struct super_block *sb, void *data, int silent) 
	kfree(oe);

out_err:

	path_put(&upperpath);

	ovl_free_fs(ufs);

	ovl_free_fs(ofs);

out:

	return err;

}