fs/overlayfs/inode.c

22 int ovl_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
26 	struct ovl_fs *ofs = OVL_FS(dentry->d_sb);
28 	struct dentry *upperdentry;
31 	err = setattr_prepare(&nop_mnt_idmap, dentry, attr);
41 		err = ovl_copy_up(dentry);
43 		err = ovl_copy_up_with_data(dentry);
47 		upperdentry = ovl_dentry_upper(dentry);
77 		err = ovl_want_write(dentry);
82 		old_cred = ovl_override_creds(dentry->d_sb);
86 			ovl_copyattr(dentry->d_inode);
88 		ovl_drop_write(dentry);
98 static void ovl_map_dev_ino(struct dentry *dentry, struct kstat *stat, int fsid)
100 	struct ovl_fs *ofs = OVL_FS(dentry->d_sb);
111 		stat->dev = dentry->d_sb->s_dev;
125 			stat->dev = dentry->d_sb->s_dev;
129 					    dentry, stat->ino, xinobits);
134 	if (S_ISDIR(dentry->d_inode->i_mode)) {
144 		stat->dev = dentry->d_sb->s_dev;
145 		stat->ino = dentry->d_inode->i_ino;
160 	struct dentry *dentry = path->dentry;
164 	struct inode *inode = d_inode(dentry);
170 	metacopy_blocks = ovl_is_metacopy_dentry(dentry);
172 	type = ovl_path_real(dentry, &realpath);
173 	old_cred = ovl_override_creds(dentry->d_sb);
190 	if (!is_dir || ovl_same_dev(OVL_FS(dentry->d_sb))) {
192 			fsid = ovl_layer_lower(dentry)->fsid;
198 			ovl_path_lower(dentry, &realpath);
219 			if (ovl_test_flag(OVL_INDEX, d_inode(dentry)) ||
220 			    (!ovl_verify_lower(dentry->d_sb) &&
222 				fsid = ovl_layer_lower(dentry)->fsid;
227 			 * If we are querying a metacopy dentry and lower
228 			 * dentry is data dentry, then use the blocks we
234 			    realpath.dentry == ovl_dentry_lowerdata(dentry)) {
250 			ovl_path_lowerdata(dentry, &realpath);
251 			if (realpath.dentry) {
264 	ovl_map_dev_ino(dentry, stat, fsid);
280 	if (!is_dir && ovl_test_flag(OVL_INDEX, d_inode(dentry)))
281 		stat->nlink = dentry->d_inode->i_nlink;
326 static const char *ovl_get_link(struct dentry *dentry,
333 	if (!dentry)
336 	old_cred = ovl_override_creds(dentry->d_sb);
337 	p = vfs_get_link(ovl_dentry_real(dentry), done);
401 	struct inode *realinode = d_inode(path->dentry);
408 		real_acl = vfs_get_acl(idmap, path->dentry, acl_name);
479 static int ovl_set_or_remove_acl(struct dentry *dentry, struct inode *inode,
486 	struct ovl_fs *ofs = OVL_FS(dentry->d_sb);
487 	struct dentry *upperdentry = ovl_dentry_upper(dentry);
488 	struct dentry *realdentry = upperdentry ?: ovl_dentry_lower(dentry);
498 		ovl_path_lower(dentry, &realpath);
499 		old_cred = ovl_override_creds(dentry->d_sb);
511 		err = ovl_copy_up(dentry);
515 		realdentry = ovl_dentry_upper(dentry);
518 	err = ovl_want_write(dentry);
522 	old_cred = ovl_override_creds(dentry->d_sb);
528 	ovl_drop_write(dentry);
536 int ovl_set_acl(struct mnt_idmap *idmap, struct dentry *dentry,
540 	struct inode *inode = d_inode(dentry);
541 	struct dentry *workdir = ovl_workdir(dentry);
562 		err = ovl_setattr(&nop_mnt_idmap, dentry, &iattr);
567 	return ovl_set_or_remove_acl(dentry, inode, acl, type);
577 			.dentry = ovl_upperdentry_dereference(OVL_I(inode)),
580 		if (upperpath.dentry) {
583 					      inode_get_atime(d_inode(upperpath.dentry)));
644 	return vfs_fileattr_set(mnt_idmap(realpath->mnt), realpath->dentry, fa);
648 		     struct dentry *dentry, struct fileattr *fa)
650 	struct inode *inode = d_inode(dentry);
656 	err = ovl_copy_up(dentry);
658 		ovl_path_real(dentry, &upperpath);
660 		err = ovl_want_write(dentry);
672 		err = ovl_set_protattr(inode, upperpath.dentry, fa);
676 		ovl_drop_write(dentry);
719 	err = vfs_fileattr_get(realpath->dentry, fa);
725 int ovl_fileattr_get(struct dentry *dentry, struct fileattr *fa)
727 	struct inode *inode = d_inode(dentry);
732 	ovl_path_real(dentry, &realpath);
970 static int ovl_set_nlink_common(struct dentry *dentry,
971 				struct dentry *realdentry, const char *format)
973 	struct inode *inode = d_inode(dentry);
984 	return ovl_setxattr(OVL_FS(inode->i_sb), ovl_dentry_upper(dentry),
988 int ovl_set_nlink_upper(struct dentry *dentry)
990 	return ovl_set_nlink_common(dentry, ovl_dentry_upper(dentry), "U%+i");
993 int ovl_set_nlink_lower(struct dentry *dentry)
995 	return ovl_set_nlink_common(dentry, ovl_dentry_lower(dentry), "L%+i");
998 unsigned int ovl_get_nlink(struct ovl_fs *ofs, struct dentry *lowerdentry,
999 			   struct dentry *upperdentry,
1060 static bool ovl_verify_inode(struct inode *inode, struct dentry *lowerdentry,
1061 			     struct dentry *upperdentry, bool strict)
1065 	 * checks, so NULL lower/upper in dentry must match NULL lower/upper in
1082 	 * or hardlinked overlay dentry and lower dentry cannot be followed
1098 struct inode *ovl_lookup_inode(struct super_block *sb, struct dentry *real,
1116 bool ovl_lookup_trap_inode(struct super_block *sb, struct dentry *dir)
1138 struct inode *ovl_get_trap_inode(struct super_block *sb, struct dentry *dir)
1167 static bool ovl_hash_bylower(struct super_block *sb, struct dentry *upper,
1168 			     struct dentry *lower, bool index)
1210 	struct dentry *upperdentry = oip->upperdentry;
1214 	struct dentry *lowerdentry = lowerpath ? lowerpath->dentry : NULL;
1216 		.dentry = upperdentry ?: lowerdentry,
1245 			 * match those in the dentry.