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(ufs->config.lowerdir);
- kfree(ufs->config.upperdir);
- kfree(ufs->config.workdir);
- if (ufs->creator_cred)
- put_cred(ufs->creator_cred);
- kfree(ufs);
+ kfree(ofs->lower_layers);
+
+ 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)
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;
}
/* 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);
}
/**
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;
#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;
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 = {
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;
}
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;
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 {
/* 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;
/*
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");
/*
* 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;
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;
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;
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;
*/
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:
}
static struct ovl_entry *ovl_get_lowerstack(struct super_block *sb,
- struct ovl_fs *ufs)
+ struct ovl_fs *ofs)
{
int err;
char *lowertmp, *lower;
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;
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;
}
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;
goto out_err;
}
- err = ovl_get_lower_layers(ufs, stack, numlower);
+ err = ovl_get_lower_layers(ofs, stack, numlower);
if (err)
goto out_err;
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)
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;
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);
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;
kfree(oe);
out_err:
path_put(&upperpath);
- ovl_free_fs(ufs);
+ ovl_free_fs(ofs);
out:
return err;
}
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