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path: root/fs/overlayfs/inode.c
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Diffstat (limited to 'fs/overlayfs/inode.c')
-rw-r--r--fs/overlayfs/inode.c68
1 files changed, 41 insertions, 27 deletions
diff --git a/fs/overlayfs/inode.c b/fs/overlayfs/inode.c
index 1f36158c7dbe..492eddeb481f 100644
--- a/fs/overlayfs/inode.c
+++ b/fs/overlayfs/inode.c
@@ -21,6 +21,7 @@ int ovl_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
struct iattr *attr)
{
int err;
+ struct ovl_fs *ofs = OVL_FS(dentry->d_sb);
bool full_copy_up = false;
struct dentry *upperdentry;
const struct cred *old_cred;
@@ -77,10 +78,10 @@ int ovl_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
inode_lock(upperdentry->d_inode);
old_cred = ovl_override_creds(dentry->d_sb);
- err = notify_change(&init_user_ns, upperdentry, attr, NULL);
+ err = ovl_do_notify_change(ofs, upperdentry, attr);
revert_creds(old_cred);
if (!err)
- ovl_copyattr(upperdentry->d_inode, dentry->d_inode);
+ ovl_copyattr(dentry->d_inode);
inode_unlock(upperdentry->d_inode);
if (winode)
@@ -279,12 +280,14 @@ int ovl_permission(struct user_namespace *mnt_userns,
struct inode *inode, int mask)
{
struct inode *upperinode = ovl_inode_upper(inode);
- struct inode *realinode = upperinode ?: ovl_inode_lower(inode);
+ struct inode *realinode;
+ struct path realpath;
const struct cred *old_cred;
int err;
/* Careful in RCU walk mode */
- if (!realinode) {
+ ovl_i_path_real(inode, &realpath);
+ if (!realpath.dentry) {
WARN_ON(!(mask & MAY_NOT_BLOCK));
return -ECHILD;
}
@@ -297,6 +300,7 @@ int ovl_permission(struct user_namespace *mnt_userns,
if (err)
return err;
+ realinode = d_inode(realpath.dentry);
old_cred = ovl_override_creds(inode->i_sb);
if (!upperinode &&
!special_file(realinode->i_mode) && mask & MAY_WRITE) {
@@ -304,7 +308,7 @@ int ovl_permission(struct user_namespace *mnt_userns,
/* Make sure mounter can read file for copy up later */
mask |= MAY_READ;
}
- err = inode_permission(&init_user_ns, realinode, mask);
+ err = inode_permission(mnt_user_ns(realpath.mnt), realinode, mask);
revert_creds(old_cred);
return err;
@@ -342,8 +346,10 @@ int ovl_xattr_set(struct dentry *dentry, struct inode *inode, const char *name,
const void *value, size_t size, int flags)
{
int err;
+ struct ovl_fs *ofs = OVL_FS(dentry->d_sb);
struct dentry *upperdentry = ovl_i_dentry_upper(inode);
struct dentry *realdentry = upperdentry ?: ovl_dentry_lower(dentry);
+ struct path realpath;
const struct cred *old_cred;
err = ovl_want_write(dentry);
@@ -351,8 +357,9 @@ int ovl_xattr_set(struct dentry *dentry, struct inode *inode, const char *name,
goto out;
if (!value && !upperdentry) {
+ ovl_path_lower(dentry, &realpath);
old_cred = ovl_override_creds(dentry->d_sb);
- err = vfs_getxattr(&init_user_ns, realdentry, name, NULL, 0);
+ err = vfs_getxattr(mnt_user_ns(realpath.mnt), realdentry, name, NULL, 0);
revert_creds(old_cred);
if (err < 0)
goto out_drop_write;
@@ -367,17 +374,17 @@ int ovl_xattr_set(struct dentry *dentry, struct inode *inode, const char *name,
}
old_cred = ovl_override_creds(dentry->d_sb);
- if (value)
- err = vfs_setxattr(&init_user_ns, realdentry, name, value, size,
- flags);
- else {
+ if (value) {
+ err = ovl_do_setxattr(ofs, realdentry, name, value, size,
+ flags);
+ } else {
WARN_ON(flags != XATTR_REPLACE);
- err = vfs_removexattr(&init_user_ns, realdentry, name);
+ err = ovl_do_removexattr(ofs, realdentry, name);
}
revert_creds(old_cred);
/* copy c/mtime */
- ovl_copyattr(d_inode(realdentry), inode);
+ ovl_copyattr(inode);
out_drop_write:
ovl_drop_write(dentry);
@@ -390,11 +397,11 @@ int ovl_xattr_get(struct dentry *dentry, struct inode *inode, const char *name,
{
ssize_t res;
const struct cred *old_cred;
- struct dentry *realdentry =
- ovl_i_dentry_upper(inode) ?: ovl_dentry_lower(dentry);
+ struct path realpath;
+ ovl_i_path_real(inode, &realpath);
old_cred = ovl_override_creds(dentry->d_sb);
- res = vfs_getxattr(&init_user_ns, realdentry, name, value, size);
+ res = vfs_getxattr(mnt_user_ns(realpath.mnt), realpath.dentry, name, value, size);
revert_creds(old_cred);
return res;
}
@@ -535,7 +542,7 @@ int ovl_real_fileattr_set(struct path *realpath, struct fileattr *fa)
if (err)
return err;
- return vfs_fileattr_set(&init_user_ns, realpath->dentry, fa);
+ return vfs_fileattr_set(mnt_user_ns(realpath->mnt), realpath->dentry, fa);
}
int ovl_fileattr_set(struct user_namespace *mnt_userns,
@@ -579,7 +586,7 @@ int ovl_fileattr_set(struct user_namespace *mnt_userns,
inode_set_flags(inode, flags, OVL_COPY_I_FLAGS_MASK);
/* Update ctime */
- ovl_copyattr(ovl_inode_real(inode), inode);
+ ovl_copyattr(inode);
}
ovl_drop_write(dentry);
out:
@@ -777,16 +784,19 @@ void ovl_inode_init(struct inode *inode, struct ovl_inode_params *oip,
unsigned long ino, int fsid)
{
struct inode *realinode;
+ struct ovl_inode *oi = OVL_I(inode);
if (oip->upperdentry)
- OVL_I(inode)->__upperdentry = oip->upperdentry;
- if (oip->lowerpath && oip->lowerpath->dentry)
- OVL_I(inode)->lower = igrab(d_inode(oip->lowerpath->dentry));
+ oi->__upperdentry = oip->upperdentry;
+ if (oip->lowerpath && oip->lowerpath->dentry) {
+ oi->lowerpath.dentry = dget(oip->lowerpath->dentry);
+ oi->lowerpath.layer = oip->lowerpath->layer;
+ }
if (oip->lowerdata)
- OVL_I(inode)->lowerdata = igrab(d_inode(oip->lowerdata));
+ oi->lowerdata = igrab(d_inode(oip->lowerdata));
realinode = ovl_inode_real(inode);
- ovl_copyattr(realinode, inode);
+ ovl_copyattr(inode);
ovl_copyflags(realinode, inode);
ovl_map_ino(inode, ino, fsid);
}
@@ -871,8 +881,8 @@ static int ovl_set_nlink_common(struct dentry *dentry,
if (WARN_ON(len >= sizeof(buf)))
return -EIO;
- return ovl_do_setxattr(OVL_FS(inode->i_sb), ovl_dentry_upper(dentry),
- OVL_XATTR_NLINK, buf, len);
+ return ovl_setxattr(OVL_FS(inode->i_sb), ovl_dentry_upper(dentry),
+ OVL_XATTR_NLINK, buf, len);
}
int ovl_set_nlink_upper(struct dentry *dentry)
@@ -897,8 +907,8 @@ unsigned int ovl_get_nlink(struct ovl_fs *ofs, struct dentry *lowerdentry,
if (!lowerdentry || !upperdentry || d_inode(lowerdentry)->i_nlink == 1)
return fallback;
- err = ovl_do_getxattr(ofs, upperdentry, OVL_XATTR_NLINK,
- &buf, sizeof(buf) - 1);
+ err = ovl_getxattr_upper(ofs, upperdentry, OVL_XATTR_NLINK,
+ &buf, sizeof(buf) - 1);
if (err < 0)
goto fail;
@@ -1102,6 +1112,10 @@ struct inode *ovl_get_inode(struct super_block *sb,
struct inode *realinode = upperdentry ? d_inode(upperdentry) : NULL;
struct inode *inode;
struct dentry *lowerdentry = lowerpath ? lowerpath->dentry : NULL;
+ struct path realpath = {
+ .dentry = upperdentry ?: lowerdentry,
+ .mnt = upperdentry ? ovl_upper_mnt(ofs) : lowerpath->layer->mnt,
+ };
bool bylower = ovl_hash_bylower(sb, upperdentry, lowerdentry,
oip->index);
int fsid = bylower ? lowerpath->layer->fsid : 0;
@@ -1175,7 +1189,7 @@ struct inode *ovl_get_inode(struct super_block *sb,
/* Check for non-merge dir that may have whiteouts */
if (is_dir) {
if (((upperdentry && lowerdentry) || oip->numlower > 1) ||
- ovl_check_origin_xattr(ofs, upperdentry ?: lowerdentry)) {
+ ovl_path_check_origin_xattr(ofs, &realpath)) {
ovl_set_flag(OVL_WHITEOUTS, inode);
}
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-04 13:49:23 +0000