aboutsummaryrefslogtreecommitdiffstats
path: root/fs/overlayfs/namei.c
diff options
context:
space:
mode:
Diffstat (limited to 'fs/overlayfs/namei.c')
-rw-r--r--fs/overlayfs/namei.c57
1 files changed, 30 insertions, 27 deletions
diff --git a/fs/overlayfs/namei.c b/fs/overlayfs/namei.c
index f7d4358db637..a6162c4076db 100644
--- a/fs/overlayfs/namei.c
+++ b/fs/overlayfs/namei.c
@@ -30,8 +30,9 @@ static int ovl_check_redirect(struct dentry *dentry, struct ovl_lookup_data *d,
{
int res;
char *buf;
+ struct ovl_fs *ofs = OVL_FS(d->sb);
- buf = ovl_get_redirect_xattr(dentry, prelen + strlen(post));
+ buf = ovl_get_redirect_xattr(ofs, dentry, prelen + strlen(post));
if (IS_ERR_OR_NULL(buf))
return PTR_ERR(buf);
@@ -104,12 +105,13 @@ int ovl_check_fb_len(struct ovl_fb *fb, int fb_len)
return 0;
}
-static struct ovl_fh *ovl_get_fh(struct dentry *dentry, const char *name)
+static struct ovl_fh *ovl_get_fh(struct ovl_fs *ofs, struct dentry *dentry,
+ enum ovl_xattr ox)
{
int res, err;
struct ovl_fh *fh = NULL;
- res = vfs_getxattr(dentry, name, NULL, 0);
+ res = ovl_do_getxattr(ofs, dentry, ox, NULL, 0);
if (res < 0) {
if (res == -ENODATA || res == -EOPNOTSUPP)
return NULL;
@@ -123,7 +125,7 @@ static struct ovl_fh *ovl_get_fh(struct dentry *dentry, const char *name)
if (!fh)
return ERR_PTR(-ENOMEM);
- res = vfs_getxattr(dentry, name, fh->buf, res);
+ res = ovl_do_getxattr(ofs, dentry, ox, fh->buf, res);
if (res < 0)
goto fail;
@@ -186,9 +188,9 @@ struct dentry *ovl_decode_real_fh(struct ovl_fh *fh, struct vfsmount *mnt,
return real;
}
-static bool ovl_is_opaquedir(struct dentry *dentry)
+static bool ovl_is_opaquedir(struct super_block *sb, struct dentry *dentry)
{
- return ovl_check_dir_xattr(dentry, OVL_XATTR_OPAQUE);
+ return ovl_check_dir_xattr(sb, dentry, OVL_XATTR_OPAQUE);
}
static struct dentry *ovl_lookup_positive_unlocked(const char *name,
@@ -251,7 +253,7 @@ static int ovl_lookup_single(struct dentry *base, struct ovl_lookup_data *d,
d->stop = true;
goto put_and_out;
}
- err = ovl_check_metacopy_xattr(this);
+ err = ovl_check_metacopy_xattr(OVL_FS(d->sb), this);
if (err < 0)
goto out_err;
@@ -271,7 +273,7 @@ static int ovl_lookup_single(struct dentry *base, struct ovl_lookup_data *d,
if (d->last)
goto out;
- if (ovl_is_opaquedir(this)) {
+ if (ovl_is_opaquedir(d->sb, this)) {
d->stop = true;
if (last_element)
d->opaque = true;
@@ -391,7 +393,7 @@ invalid:
static int ovl_check_origin(struct ovl_fs *ofs, struct dentry *upperdentry,
struct ovl_path **stackp)
{
- struct ovl_fh *fh = ovl_get_fh(upperdentry, OVL_XATTR_ORIGIN);
+ struct ovl_fh *fh = ovl_get_fh(ofs, upperdentry, OVL_XATTR_ORIGIN);
int err;
if (IS_ERR_OR_NULL(fh))
@@ -413,10 +415,10 @@ static int ovl_check_origin(struct ovl_fs *ofs, struct dentry *upperdentry,
* Verify that @fh matches the file handle stored in xattr @name.
* Return 0 on match, -ESTALE on mismatch, < 0 on error.
*/
-static int ovl_verify_fh(struct dentry *dentry, const char *name,
- const struct ovl_fh *fh)
+static int ovl_verify_fh(struct ovl_fs *ofs, struct dentry *dentry,
+ enum ovl_xattr ox, const struct ovl_fh *fh)
{
- struct ovl_fh *ofh = ovl_get_fh(dentry, name);
+ struct ovl_fh *ofh = ovl_get_fh(ofs, dentry, ox);
int err = 0;
if (!ofh)
@@ -440,8 +442,9 @@ static int ovl_verify_fh(struct dentry *dentry, const char *name,
*
* Return 0 on match, -ESTALE on mismatch, -ENODATA on no xattr, < 0 on error.
*/
-int ovl_verify_set_fh(struct dentry *dentry, const char *name,
- struct dentry *real, bool is_upper, bool set)
+int ovl_verify_set_fh(struct ovl_fs *ofs, struct dentry *dentry,
+ enum ovl_xattr ox, struct dentry *real, bool is_upper,
+ bool set)
{
struct inode *inode;
struct ovl_fh *fh;
@@ -454,9 +457,9 @@ int ovl_verify_set_fh(struct dentry *dentry, const char *name,
goto fail;
}
- err = ovl_verify_fh(dentry, name, fh);
+ err = ovl_verify_fh(ofs, dentry, ox, fh);
if (set && err == -ENODATA)
- err = ovl_do_setxattr(dentry, name, fh->buf, fh->fb.len, 0);
+ err = ovl_do_setxattr(ofs, dentry, ox, fh->buf, fh->fb.len);
if (err)
goto fail;
@@ -481,7 +484,7 @@ struct dentry *ovl_index_upper(struct ovl_fs *ofs, struct dentry *index)
if (!d_is_dir(index))
return dget(index);
- fh = ovl_get_fh(index, OVL_XATTR_UPPER);
+ fh = ovl_get_fh(ofs, index, OVL_XATTR_UPPER);
if (IS_ERR_OR_NULL(fh))
return ERR_CAST(fh);
@@ -574,7 +577,7 @@ int ovl_verify_index(struct ovl_fs *ofs, struct dentry *index)
goto fail;
}
- err = ovl_verify_fh(upper, OVL_XATTR_ORIGIN, fh);
+ err = ovl_verify_fh(ofs, upper, OVL_XATTR_ORIGIN, fh);
dput(upper);
if (err)
goto fail;
@@ -585,7 +588,7 @@ int ovl_verify_index(struct ovl_fs *ofs, struct dentry *index)
if (err)
goto fail;
- if (ovl_get_nlink(origin.dentry, index, 0) == 0)
+ if (ovl_get_nlink(ofs, origin.dentry, index, 0) == 0)
goto orphan;
}
@@ -741,7 +744,7 @@ struct dentry *ovl_lookup_index(struct ovl_fs *ofs, struct dentry *upper,
}
/* Verify that dir index 'upper' xattr points to upper dir */
- err = ovl_verify_upper(index, upper, false);
+ err = ovl_verify_upper(ofs, index, upper, false);
if (err) {
if (err == -ESTALE) {
pr_warn_ratelimited("suspected multiply redirected dir found (upper=%pd2, origin=%pd2, index=%pd2).\n",
@@ -790,12 +793,12 @@ int ovl_path_next(int idx, struct dentry *dentry, struct path *path)
}
/* Fix missing 'origin' xattr */
-static int ovl_fix_origin(struct dentry *dentry, struct dentry *lower,
- struct dentry *upper)
+static int ovl_fix_origin(struct ovl_fs *ofs, struct dentry *dentry,
+ struct dentry *lower, struct dentry *upper)
{
int err;
- if (ovl_check_origin_xattr(upper))
+ if (ovl_check_origin_xattr(ofs, upper))
return 0;
err = ovl_want_write(dentry);
@@ -920,7 +923,7 @@ struct dentry *ovl_lookup(struct inode *dir, struct dentry *dentry,
* of lower dir and set upper parent "impure".
*/
if (upperdentry && !ctr && !ofs->noxattr && d.is_dir) {
- err = ovl_fix_origin(dentry, this, upperdentry);
+ err = ovl_fix_origin(ofs, dentry, this, upperdentry);
if (err) {
dput(this);
goto out_put;
@@ -939,7 +942,7 @@ struct dentry *ovl_lookup(struct inode *dir, struct dentry *dentry,
if (upperdentry && !ctr &&
((d.is_dir && ovl_verify_lower(dentry->d_sb)) ||
(!d.is_dir && ofs->config.index && origin_path))) {
- err = ovl_verify_origin(upperdentry, this, false);
+ err = ovl_verify_origin(ofs, upperdentry, this, false);
if (err) {
dput(this);
if (d.is_dir)
@@ -1060,13 +1063,13 @@ struct dentry *ovl_lookup(struct inode *dir, struct dentry *dentry,
ovl_dentry_set_upper_alias(dentry);
else if (index) {
upperdentry = dget(index);
- upperredirect = ovl_get_redirect_xattr(upperdentry, 0);
+ upperredirect = ovl_get_redirect_xattr(ofs, upperdentry, 0);
if (IS_ERR(upperredirect)) {
err = PTR_ERR(upperredirect);
upperredirect = NULL;
goto out_free_oe;
}
- err = ovl_check_metacopy_xattr(upperdentry);
+ err = ovl_check_metacopy_xattr(ofs, upperdentry);
if (err < 0)
goto out_free_oe;
uppermetacopy = err;
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.