^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Copyright (C) 2011 Novell Inc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) #include <linux/fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/namei.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/xattr.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/security.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/cred.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/posix_acl.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/posix_acl_xattr.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/atomic.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/ratelimit.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include "overlayfs.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) static unsigned short ovl_redirect_max = 256;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) module_param_named(redirect_max, ovl_redirect_max, ushort, 0644);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) MODULE_PARM_DESC(redirect_max,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) "Maximum length of absolute redirect xattr value");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) static int ovl_set_redirect(struct dentry *dentry, bool samedir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) int ovl_cleanup(struct inode *wdir, struct dentry *wdentry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) dget(wdentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) if (d_is_dir(wdentry))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) err = ovl_do_rmdir(wdir, wdentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) err = ovl_do_unlink(wdir, wdentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) dput(wdentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) pr_err("cleanup of '%pd2' failed (%i)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) wdentry, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) struct dentry *ovl_lookup_temp(struct dentry *workdir)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) struct dentry *temp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) char name[20];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) static atomic_t temp_id = ATOMIC_INIT(0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) /* counter is allowed to wrap, since temp dentries are ephemeral */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) snprintf(name, sizeof(name), "#%x", atomic_inc_return(&temp_id));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) temp = lookup_one_len(name, workdir, strlen(name));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) if (!IS_ERR(temp) && temp->d_inode) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) pr_err("workdir/%s already exists\n", name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) dput(temp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) temp = ERR_PTR(-EIO);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) return temp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) /* caller holds i_mutex on workdir */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) static struct dentry *ovl_whiteout(struct ovl_fs *ofs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) struct dentry *whiteout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) struct dentry *workdir = ofs->workdir;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) struct inode *wdir = workdir->d_inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) if (!ofs->whiteout) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) whiteout = ovl_lookup_temp(workdir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) if (IS_ERR(whiteout))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) err = ovl_do_whiteout(wdir, whiteout);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) dput(whiteout);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) whiteout = ERR_PTR(err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) ofs->whiteout = whiteout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) if (ofs->share_whiteout) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) whiteout = ovl_lookup_temp(workdir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) if (IS_ERR(whiteout))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) err = ovl_do_link(ofs->whiteout, wdir, whiteout);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) if (!err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) if (err != -EMLINK) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) pr_warn("Failed to link whiteout - disabling whiteout inode sharing(nlink=%u, err=%i)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) ofs->whiteout->d_inode->i_nlink, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) ofs->share_whiteout = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) dput(whiteout);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) whiteout = ofs->whiteout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) ofs->whiteout = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) return whiteout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) /* Caller must hold i_mutex on both workdir and dir */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) int ovl_cleanup_and_whiteout(struct ovl_fs *ofs, struct inode *dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) struct dentry *dentry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) struct inode *wdir = ofs->workdir->d_inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) struct dentry *whiteout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) int flags = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) whiteout = ovl_whiteout(ofs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) err = PTR_ERR(whiteout);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) if (IS_ERR(whiteout))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) if (d_is_dir(dentry))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) flags = RENAME_EXCHANGE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) err = ovl_do_rename(wdir, whiteout, dir, dentry, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) goto kill_whiteout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) if (flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) ovl_cleanup(wdir, dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) dput(whiteout);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) kill_whiteout:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) ovl_cleanup(wdir, whiteout);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) int ovl_mkdir_real(struct inode *dir, struct dentry **newdentry, umode_t mode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) struct dentry *d, *dentry = *newdentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) err = ovl_do_mkdir(dir, dentry, mode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) if (likely(!d_unhashed(dentry)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) * vfs_mkdir() may succeed and leave the dentry passed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) * to it unhashed and negative. If that happens, try to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) * lookup a new hashed and positive dentry.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) d = lookup_one_len(dentry->d_name.name, dentry->d_parent,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) dentry->d_name.len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) if (IS_ERR(d)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) pr_warn("failed lookup after mkdir (%pd2, err=%i).\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) dentry, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) return PTR_ERR(d);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) dput(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) *newdentry = d;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) struct dentry *ovl_create_real(struct inode *dir, struct dentry *newdentry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) struct ovl_cattr *attr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) if (IS_ERR(newdentry))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) return newdentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) err = -ESTALE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) if (newdentry->d_inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) if (attr->hardlink) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) err = ovl_do_link(attr->hardlink, dir, newdentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) switch (attr->mode & S_IFMT) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) case S_IFREG:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) err = ovl_do_create(dir, newdentry, attr->mode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) case S_IFDIR:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) /* mkdir is special... */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) err = ovl_mkdir_real(dir, &newdentry, attr->mode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) case S_IFCHR:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) case S_IFBLK:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) case S_IFIFO:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) case S_IFSOCK:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) err = ovl_do_mknod(dir, newdentry, attr->mode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) attr->rdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) case S_IFLNK:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) err = ovl_do_symlink(dir, newdentry, attr->link);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) err = -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) if (!err && WARN_ON(!newdentry->d_inode)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) * Not quite sure if non-instantiated dentry is legal or not.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) * VFS doesn't seem to care so check and warn here.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) err = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) dput(newdentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) return ERR_PTR(err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) return newdentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) struct dentry *ovl_create_temp(struct dentry *workdir, struct ovl_cattr *attr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) return ovl_create_real(d_inode(workdir), ovl_lookup_temp(workdir),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) attr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) static int ovl_set_opaque_xerr(struct dentry *dentry, struct dentry *upper,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) int xerr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) err = ovl_check_setxattr(dentry, upper, OVL_XATTR_OPAQUE, "y", 1, xerr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) if (!err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) ovl_dentry_set_opaque(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) static int ovl_set_opaque(struct dentry *dentry, struct dentry *upperdentry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) * Fail with -EIO when trying to create opaque dir and upper doesn't
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) * support xattrs. ovl_rename() calls ovl_set_opaque_xerr(-EXDEV) to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) * return a specific error for noxattr case.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) return ovl_set_opaque_xerr(dentry, upperdentry, -EIO);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) * Common operations required to be done after creation of file on upper.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) * If @hardlink is false, then @inode is a pre-allocated inode, we may or
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) * may not use to instantiate the new dentry.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) static int ovl_instantiate(struct dentry *dentry, struct inode *inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) struct dentry *newdentry, bool hardlink)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) struct ovl_inode_params oip = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) .upperdentry = newdentry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) .newinode = inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) ovl_dir_modified(dentry->d_parent, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) ovl_dentry_set_upper_alias(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) ovl_dentry_update_reval(dentry, newdentry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) DCACHE_OP_REVALIDATE | DCACHE_OP_WEAK_REVALIDATE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) if (!hardlink) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) * ovl_obtain_alias() can be called after ovl_create_real()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) * and before we get here, so we may get an inode from cache
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) * with the same real upperdentry that is not the inode we
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) * pre-allocated. In this case we will use the cached inode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) * to instantiate the new dentry.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) * XXX: if we ever use ovl_obtain_alias() to decode directory
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) * file handles, need to use ovl_get_inode_locked() and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) * d_instantiate_new() here to prevent from creating two
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) * hashed directory inode aliases.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) inode = ovl_get_inode(dentry->d_sb, &oip);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) if (IS_ERR(inode))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) return PTR_ERR(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) if (inode == oip.newinode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) ovl_set_flag(OVL_UPPERDATA, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) WARN_ON(ovl_inode_real(inode) != d_inode(newdentry));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) dput(newdentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) inc_nlink(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) d_instantiate(dentry, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) if (inode != oip.newinode) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) pr_warn_ratelimited("newly created inode found in cache (%pd2)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) /* Force lookup of new upper hardlink to find its lower */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) if (hardlink)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) d_drop(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) static bool ovl_type_merge(struct dentry *dentry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) return OVL_TYPE_MERGE(ovl_path_type(dentry));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) static bool ovl_type_origin(struct dentry *dentry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) return OVL_TYPE_ORIGIN(ovl_path_type(dentry));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) static int ovl_create_upper(struct dentry *dentry, struct inode *inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) struct ovl_cattr *attr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) struct dentry *upperdir = ovl_dentry_upper(dentry->d_parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) struct inode *udir = upperdir->d_inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) struct dentry *newdentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) if (!attr->hardlink && !IS_POSIXACL(udir))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) attr->mode &= ~current_umask();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) inode_lock_nested(udir, I_MUTEX_PARENT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) newdentry = ovl_create_real(udir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) lookup_one_len(dentry->d_name.name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) upperdir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) dentry->d_name.len),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) attr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) err = PTR_ERR(newdentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) if (IS_ERR(newdentry))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) goto out_unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) if (ovl_type_merge(dentry->d_parent) && d_is_dir(newdentry)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) /* Setting opaque here is just an optimization, allow to fail */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) ovl_set_opaque(dentry, newdentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) err = ovl_instantiate(dentry, inode, newdentry, !!attr->hardlink);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) goto out_cleanup;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) out_unlock:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) inode_unlock(udir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) out_cleanup:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) ovl_cleanup(udir, newdentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) dput(newdentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) goto out_unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) static struct dentry *ovl_clear_empty(struct dentry *dentry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) struct list_head *list)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) struct dentry *workdir = ovl_workdir(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) struct inode *wdir = workdir->d_inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) struct dentry *upperdir = ovl_dentry_upper(dentry->d_parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) struct inode *udir = upperdir->d_inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) struct path upperpath;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) struct dentry *upper;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) struct dentry *opaquedir;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) struct kstat stat;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) if (WARN_ON(!workdir))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) return ERR_PTR(-EROFS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) err = ovl_lock_rename_workdir(workdir, upperdir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) ovl_path_upper(dentry, &upperpath);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) err = vfs_getattr(&upperpath, &stat,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) goto out_unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) err = -ESTALE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) if (!S_ISDIR(stat.mode))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) goto out_unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) upper = upperpath.dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) if (upper->d_parent->d_inode != udir)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) goto out_unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) opaquedir = ovl_create_temp(workdir, OVL_CATTR(stat.mode));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) err = PTR_ERR(opaquedir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) if (IS_ERR(opaquedir))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) goto out_unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) err = ovl_copy_xattr(dentry->d_sb, upper, opaquedir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) goto out_cleanup;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) err = ovl_set_opaque(dentry, opaquedir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) goto out_cleanup;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) inode_lock(opaquedir->d_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) err = ovl_set_attr(opaquedir, &stat);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) inode_unlock(opaquedir->d_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) goto out_cleanup;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) err = ovl_do_rename(wdir, opaquedir, udir, upper, RENAME_EXCHANGE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) goto out_cleanup;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) ovl_cleanup_whiteouts(upper, list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) ovl_cleanup(wdir, upper);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) unlock_rename(workdir, upperdir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) /* dentry's upper doesn't match now, get rid of it */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) d_drop(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) return opaquedir;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) out_cleanup:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) ovl_cleanup(wdir, opaquedir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) dput(opaquedir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) out_unlock:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) unlock_rename(workdir, upperdir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) return ERR_PTR(err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) static int ovl_set_upper_acl(struct dentry *upperdentry, const char *name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) const struct posix_acl *acl)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) void *buffer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) size_t size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) if (!IS_ENABLED(CONFIG_FS_POSIX_ACL) || !acl)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) size = posix_acl_xattr_size(acl->a_count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) buffer = kmalloc(size, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) if (!buffer)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) err = posix_acl_to_xattr(&init_user_ns, acl, buffer, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) if (err < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) goto out_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) err = vfs_setxattr(upperdentry, name, buffer, size, XATTR_CREATE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) out_free:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) kfree(buffer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) static int ovl_create_over_whiteout(struct dentry *dentry, struct inode *inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) struct ovl_cattr *cattr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) struct dentry *workdir = ovl_workdir(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) struct inode *wdir = workdir->d_inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) struct dentry *upperdir = ovl_dentry_upper(dentry->d_parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) struct inode *udir = upperdir->d_inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) struct dentry *upper;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) struct dentry *newdentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) struct posix_acl *acl, *default_acl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) bool hardlink = !!cattr->hardlink;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) if (WARN_ON(!workdir))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) return -EROFS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) if (!hardlink) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) err = posix_acl_create(dentry->d_parent->d_inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) &cattr->mode, &default_acl, &acl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) err = ovl_lock_rename_workdir(workdir, upperdir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) upper = lookup_one_len(dentry->d_name.name, upperdir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) dentry->d_name.len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) err = PTR_ERR(upper);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) if (IS_ERR(upper))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) goto out_unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) err = -ESTALE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) if (d_is_negative(upper) || !IS_WHITEOUT(d_inode(upper)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) goto out_dput;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) newdentry = ovl_create_temp(workdir, cattr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) err = PTR_ERR(newdentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) if (IS_ERR(newdentry))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) goto out_dput;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) * mode could have been mutilated due to umask (e.g. sgid directory)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) if (!hardlink &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) !S_ISLNK(cattr->mode) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) newdentry->d_inode->i_mode != cattr->mode) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) struct iattr attr = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) .ia_valid = ATTR_MODE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) .ia_mode = cattr->mode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) inode_lock(newdentry->d_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) err = notify_change(newdentry, &attr, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) inode_unlock(newdentry->d_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) goto out_cleanup;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) if (!hardlink) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) err = ovl_set_upper_acl(newdentry, XATTR_NAME_POSIX_ACL_ACCESS,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) acl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) goto out_cleanup;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) err = ovl_set_upper_acl(newdentry, XATTR_NAME_POSIX_ACL_DEFAULT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) default_acl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) goto out_cleanup;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) if (!hardlink && S_ISDIR(cattr->mode)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) err = ovl_set_opaque(dentry, newdentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) goto out_cleanup;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) err = ovl_do_rename(wdir, newdentry, udir, upper,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) RENAME_EXCHANGE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) goto out_cleanup;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) ovl_cleanup(wdir, upper);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) err = ovl_do_rename(wdir, newdentry, udir, upper, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) goto out_cleanup;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) err = ovl_instantiate(dentry, inode, newdentry, hardlink);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) ovl_cleanup(udir, newdentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) dput(newdentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) out_dput:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) dput(upper);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) out_unlock:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) unlock_rename(workdir, upperdir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) if (!hardlink) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) posix_acl_release(acl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) posix_acl_release(default_acl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) out_cleanup:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) ovl_cleanup(wdir, newdentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) dput(newdentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) goto out_dput;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) static int ovl_create_or_link(struct dentry *dentry, struct inode *inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) struct ovl_cattr *attr, bool origin)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) const struct cred *old_cred, *hold_cred = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) struct cred *override_cred;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) struct dentry *parent = dentry->d_parent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573) err = ovl_copy_up(parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577) old_cred = ovl_override_creds(dentry->d_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580) * When linking a file with copy up origin into a new parent, mark the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) * new parent dir "impure".
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) if (origin) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) err = ovl_set_impure(parent, ovl_dentry_upper(parent));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) goto out_revert_creds;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) err = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) override_cred = prepare_creds();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591) if (override_cred) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) override_cred->fsuid = inode->i_uid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593) override_cred->fsgid = inode->i_gid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594) if (!attr->hardlink) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595) err = security_dentry_create_files_as(dentry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596) attr->mode, &dentry->d_name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597) old_cred ? old_cred : current_cred(),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598) override_cred);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600) put_cred(override_cred);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601) goto out_revert_creds;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604) hold_cred = override_creds(override_cred);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605) put_cred(override_cred);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607) if (!ovl_dentry_is_whiteout(dentry))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608) err = ovl_create_upper(dentry, inode, attr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610) err = ovl_create_over_whiteout(dentry, inode, attr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612) out_revert_creds:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613) ovl_revert_creds(dentry->d_sb, old_cred ?: hold_cred);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) if (old_cred && hold_cred)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) put_cred(hold_cred);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619) static int ovl_create_object(struct dentry *dentry, int mode, dev_t rdev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620) const char *link)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623) struct inode *inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624) struct ovl_cattr attr = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625) .rdev = rdev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626) .link = link,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629) err = ovl_want_write(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633) /* Preallocate inode to be used by ovl_get_inode() */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634) err = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635) inode = ovl_new_inode(dentry->d_sb, mode, rdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636) if (!inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637) goto out_drop_write;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639) spin_lock(&inode->i_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640) inode->i_state |= I_CREATING;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641) spin_unlock(&inode->i_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643) inode_init_owner(inode, dentry->d_parent->d_inode, mode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644) attr.mode = inode->i_mode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646) err = ovl_create_or_link(dentry, inode, &attr, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647) /* Did we end up using the preallocated inode? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648) if (inode != d_inode(dentry))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649) iput(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 651) out_drop_write:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 652) ovl_drop_write(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 653) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 654) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 655) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 656)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 657) static int ovl_create(struct inode *dir, struct dentry *dentry, umode_t mode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 658) bool excl)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 659) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 660) return ovl_create_object(dentry, (mode & 07777) | S_IFREG, 0, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 661) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 662)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 663) static int ovl_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 664) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 665) return ovl_create_object(dentry, (mode & 07777) | S_IFDIR, 0, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 666) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 667)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 668) static int ovl_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 669) dev_t rdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 670) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 671) /* Don't allow creation of "whiteout" on overlay */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 672) if (S_ISCHR(mode) && rdev == WHITEOUT_DEV)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 673) return -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 674)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 675) return ovl_create_object(dentry, mode, rdev, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 676) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 677)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 678) static int ovl_symlink(struct inode *dir, struct dentry *dentry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 679) const char *link)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 680) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 681) return ovl_create_object(dentry, S_IFLNK, 0, link);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 682) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 683)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 684) static int ovl_set_link_redirect(struct dentry *dentry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 685) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 686) const struct cred *old_cred;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 687) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 688)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 689) old_cred = ovl_override_creds(dentry->d_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 690) err = ovl_set_redirect(dentry, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 691) ovl_revert_creds(dentry->d_sb, old_cred);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 692)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 693) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 694) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 695)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 696) static int ovl_link(struct dentry *old, struct inode *newdir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 697) struct dentry *new)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 698) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 699) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 700) struct inode *inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 701)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 702) err = ovl_want_write(old);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 703) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 704) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 705)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 706) err = ovl_copy_up(old);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 707) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 708) goto out_drop_write;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 709)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 710) err = ovl_copy_up(new->d_parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 711) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 712) goto out_drop_write;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 713)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 714) if (ovl_is_metacopy_dentry(old)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 715) err = ovl_set_link_redirect(old);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 716) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 717) goto out_drop_write;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 718) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 719)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 720) err = ovl_nlink_start(old);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 721) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 722) goto out_drop_write;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 723)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 724) inode = d_inode(old);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 725) ihold(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 726)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 727) err = ovl_create_or_link(new, inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 728) &(struct ovl_cattr) {.hardlink = ovl_dentry_upper(old)},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 729) ovl_type_origin(old));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 730) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 731) iput(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 732)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 733) ovl_nlink_end(old);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 734) out_drop_write:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 735) ovl_drop_write(old);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 736) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 737) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 738) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 739)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 740) static bool ovl_matches_upper(struct dentry *dentry, struct dentry *upper)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 741) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 742) return d_inode(ovl_dentry_upper(dentry)) == d_inode(upper);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 743) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 744)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 745) static int ovl_remove_and_whiteout(struct dentry *dentry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 746) struct list_head *list)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 747) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 748) struct ovl_fs *ofs = OVL_FS(dentry->d_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 749) struct dentry *workdir = ovl_workdir(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 750) struct dentry *upperdir = ovl_dentry_upper(dentry->d_parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 751) struct dentry *upper;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 752) struct dentry *opaquedir = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 753) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 754)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 755) if (WARN_ON(!workdir))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 756) return -EROFS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 757)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 758) if (!list_empty(list)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 759) opaquedir = ovl_clear_empty(dentry, list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 760) err = PTR_ERR(opaquedir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 761) if (IS_ERR(opaquedir))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 762) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 763) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 764)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 765) err = ovl_lock_rename_workdir(workdir, upperdir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 766) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 767) goto out_dput;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 768)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 769) upper = lookup_one_len(dentry->d_name.name, upperdir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 770) dentry->d_name.len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 771) err = PTR_ERR(upper);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 772) if (IS_ERR(upper))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 773) goto out_unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 774)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 775) err = -ESTALE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 776) if ((opaquedir && upper != opaquedir) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 777) (!opaquedir && ovl_dentry_upper(dentry) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 778) !ovl_matches_upper(dentry, upper))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 779) goto out_dput_upper;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 780) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 781)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 782) err = ovl_cleanup_and_whiteout(ofs, d_inode(upperdir), upper);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 783) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 784) goto out_d_drop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 785)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 786) ovl_dir_modified(dentry->d_parent, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 787) out_d_drop:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 788) d_drop(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 789) out_dput_upper:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 790) dput(upper);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 791) out_unlock:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 792) unlock_rename(workdir, upperdir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 793) out_dput:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 794) dput(opaquedir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 795) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 796) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 797) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 798)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 799) static int ovl_remove_upper(struct dentry *dentry, bool is_dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 800) struct list_head *list)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 801) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 802) struct dentry *upperdir = ovl_dentry_upper(dentry->d_parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 803) struct inode *dir = upperdir->d_inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 804) struct dentry *upper;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 805) struct dentry *opaquedir = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 806) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 807)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 808) if (!list_empty(list)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 809) opaquedir = ovl_clear_empty(dentry, list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 810) err = PTR_ERR(opaquedir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 811) if (IS_ERR(opaquedir))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 812) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 813) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 814)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 815) inode_lock_nested(dir, I_MUTEX_PARENT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 816) upper = lookup_one_len(dentry->d_name.name, upperdir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 817) dentry->d_name.len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 818) err = PTR_ERR(upper);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 819) if (IS_ERR(upper))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 820) goto out_unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 821)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 822) err = -ESTALE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 823) if ((opaquedir && upper != opaquedir) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 824) (!opaquedir && !ovl_matches_upper(dentry, upper)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 825) goto out_dput_upper;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 826)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 827) if (is_dir)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 828) err = vfs_rmdir(dir, upper);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 829) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 830) err = vfs_unlink(dir, upper, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 831) ovl_dir_modified(dentry->d_parent, ovl_type_origin(dentry));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 832)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 833) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 834) * Keeping this dentry hashed would mean having to release
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 835) * upperpath/lowerpath, which could only be done if we are the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 836) * sole user of this dentry. Too tricky... Just unhash for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 837) * now.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 838) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 839) if (!err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 840) d_drop(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 841) out_dput_upper:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 842) dput(upper);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 843) out_unlock:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 844) inode_unlock(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 845) dput(opaquedir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 846) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 847) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 848) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 849)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 850) static bool ovl_pure_upper(struct dentry *dentry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 851) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 852) return !ovl_dentry_lower(dentry) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 853) !ovl_test_flag(OVL_WHITEOUTS, d_inode(dentry));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 854) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 855)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 856) static void ovl_drop_nlink(struct dentry *dentry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 857) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 858) struct inode *inode = d_inode(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 859) struct dentry *alias;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 860)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 861) /* Try to find another, hashed alias */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 862) spin_lock(&inode->i_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 863) hlist_for_each_entry(alias, &inode->i_dentry, d_u.d_alias) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 864) if (alias != dentry && !d_unhashed(alias))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 865) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 866) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 867) spin_unlock(&inode->i_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 868)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 869) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 870) * Changes to underlying layers may cause i_nlink to lose sync with
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 871) * reality. In this case prevent the link count from going to zero
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 872) * prematurely.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 873) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 874) if (inode->i_nlink > !!alias)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 875) drop_nlink(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 876) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 877)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 878) static int ovl_do_remove(struct dentry *dentry, bool is_dir)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 879) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 880) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 881) const struct cred *old_cred;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 882) struct dentry *upperdentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 883) bool lower_positive = ovl_lower_positive(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 884) LIST_HEAD(list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 885)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 886) /* No need to clean pure upper removed by vfs_rmdir() */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 887) if (is_dir && (lower_positive || !ovl_pure_upper(dentry))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 888) err = ovl_check_empty_dir(dentry, &list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 889) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 890) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 891) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 892)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 893) err = ovl_want_write(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 894) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 895) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 896)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 897) err = ovl_copy_up(dentry->d_parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 898) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 899) goto out_drop_write;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 900)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 901) err = ovl_nlink_start(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 902) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 903) goto out_drop_write;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 904)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 905) old_cred = ovl_override_creds(dentry->d_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 906) if (!lower_positive)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 907) err = ovl_remove_upper(dentry, is_dir, &list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 908) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 909) err = ovl_remove_and_whiteout(dentry, &list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 910) ovl_revert_creds(dentry->d_sb, old_cred);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 911) if (!err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 912) if (is_dir)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 913) clear_nlink(dentry->d_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 914) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 915) ovl_drop_nlink(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 916) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 917) ovl_nlink_end(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 918)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 919) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 920) * Copy ctime
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 921) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 922) * Note: we fail to update ctime if there was no copy-up, only a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 923) * whiteout
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 924) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 925) upperdentry = ovl_dentry_upper(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 926) if (upperdentry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 927) ovl_copyattr(d_inode(upperdentry), d_inode(dentry));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 928)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 929) out_drop_write:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 930) ovl_drop_write(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 931) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 932) ovl_cache_free(&list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 933) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 934) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 935)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 936) static int ovl_unlink(struct inode *dir, struct dentry *dentry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 937) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 938) return ovl_do_remove(dentry, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 939) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 940)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 941) static int ovl_rmdir(struct inode *dir, struct dentry *dentry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 942) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 943) return ovl_do_remove(dentry, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 944) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 945)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 946) static bool ovl_type_merge_or_lower(struct dentry *dentry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 947) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 948) enum ovl_path_type type = ovl_path_type(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 949)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 950) return OVL_TYPE_MERGE(type) || !OVL_TYPE_UPPER(type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 951) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 952)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 953) static bool ovl_can_move(struct dentry *dentry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 954) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 955) return ovl_redirect_dir(dentry->d_sb) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 956) !d_is_dir(dentry) || !ovl_type_merge_or_lower(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 957) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 958)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 959) static char *ovl_get_redirect(struct dentry *dentry, bool abs_redirect)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 960) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 961) char *buf, *ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 962) struct dentry *d, *tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 963) int buflen = ovl_redirect_max + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 964)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 965) if (!abs_redirect) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 966) ret = kstrndup(dentry->d_name.name, dentry->d_name.len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 967) GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 968) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 969) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 970)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 971) buf = ret = kmalloc(buflen, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 972) if (!buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 973) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 974)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 975) buflen--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 976) buf[buflen] = '\0';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 977) for (d = dget(dentry); !IS_ROOT(d);) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 978) const char *name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 979) int thislen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 980)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 981) spin_lock(&d->d_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 982) name = ovl_dentry_get_redirect(d);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 983) if (name) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 984) thislen = strlen(name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 985) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 986) name = d->d_name.name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 987) thislen = d->d_name.len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 988) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 989)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 990) /* If path is too long, fall back to userspace move */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 991) if (thislen + (name[0] != '/') > buflen) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 992) ret = ERR_PTR(-EXDEV);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 993) spin_unlock(&d->d_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 994) goto out_put;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 995) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 996)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 997) buflen -= thislen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 998) memcpy(&buf[buflen], name, thislen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 999) spin_unlock(&d->d_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1000) tmp = dget_parent(d);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1001)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1002) dput(d);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1003) d = tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1004)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1005) /* Absolute redirect: finished */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1006) if (buf[buflen] == '/')
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1007) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1008) buflen--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1009) buf[buflen] = '/';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1010) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1011) ret = kstrdup(&buf[buflen], GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1012) out_put:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1013) dput(d);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1014) kfree(buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1015) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1016) return ret ? ret : ERR_PTR(-ENOMEM);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1017) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1018)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1019) static bool ovl_need_absolute_redirect(struct dentry *dentry, bool samedir)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1020) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1021) struct dentry *lowerdentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1022)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1023) if (!samedir)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1024) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1025)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1026) if (d_is_dir(dentry))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1027) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1028)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1029) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1030) * For non-dir hardlinked files, we need absolute redirects
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1031) * in general as two upper hardlinks could be in different
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1032) * dirs. We could put a relative redirect now and convert
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1033) * it to absolute redirect later. But when nlink > 1 and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1034) * indexing is on, that means relative redirect needs to be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1035) * converted to absolute during copy up of another lower
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1036) * hardllink as well.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1037) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1038) * So without optimizing too much, just check if lower is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1039) * a hard link or not. If lower is hard link, put absolute
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1040) * redirect.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1041) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1042) lowerdentry = ovl_dentry_lower(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1043) return (d_inode(lowerdentry)->i_nlink > 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1044) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1045)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1046) static int ovl_set_redirect(struct dentry *dentry, bool samedir)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1047) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1048) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1049) const char *redirect = ovl_dentry_get_redirect(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1050) bool absolute_redirect = ovl_need_absolute_redirect(dentry, samedir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1051)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1052) if (redirect && (!absolute_redirect || redirect[0] == '/'))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1053) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1054)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1055) redirect = ovl_get_redirect(dentry, absolute_redirect);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1056) if (IS_ERR(redirect))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1057) return PTR_ERR(redirect);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1058)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1059) err = ovl_check_setxattr(dentry, ovl_dentry_upper(dentry),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1060) OVL_XATTR_REDIRECT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1061) redirect, strlen(redirect), -EXDEV);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1062) if (!err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1063) spin_lock(&dentry->d_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1064) ovl_dentry_set_redirect(dentry, redirect);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1065) spin_unlock(&dentry->d_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1066) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1067) kfree(redirect);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1068) pr_warn_ratelimited("failed to set redirect (%i)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1069) err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1070) /* Fall back to userspace copy-up */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1071) err = -EXDEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1072) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1073) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1074) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1075)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1076) static int ovl_rename(struct inode *olddir, struct dentry *old,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1077) struct inode *newdir, struct dentry *new,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1078) unsigned int flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1079) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1080) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1081) struct dentry *old_upperdir;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1082) struct dentry *new_upperdir;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1083) struct dentry *olddentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1084) struct dentry *newdentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1085) struct dentry *trap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1086) bool old_opaque;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1087) bool new_opaque;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1088) bool cleanup_whiteout = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1089) bool update_nlink = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1090) bool overwrite = !(flags & RENAME_EXCHANGE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1091) bool is_dir = d_is_dir(old);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1092) bool new_is_dir = d_is_dir(new);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1093) bool samedir = olddir == newdir;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1094) struct dentry *opaquedir = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1095) const struct cred *old_cred = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1096) LIST_HEAD(list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1097)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1098) err = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1099) if (flags & ~(RENAME_EXCHANGE | RENAME_NOREPLACE))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1100) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1101)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1102) flags &= ~RENAME_NOREPLACE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1103)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1104) /* Don't copy up directory trees */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1105) err = -EXDEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1106) if (!ovl_can_move(old))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1107) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1108) if (!overwrite && !ovl_can_move(new))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1109) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1110)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1111) if (overwrite && new_is_dir && !ovl_pure_upper(new)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1112) err = ovl_check_empty_dir(new, &list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1113) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1114) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1115) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1116)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1117) if (overwrite) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1118) if (ovl_lower_positive(old)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1119) if (!ovl_dentry_is_whiteout(new)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1120) /* Whiteout source */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1121) flags |= RENAME_WHITEOUT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1122) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1123) /* Switch whiteouts */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1124) flags |= RENAME_EXCHANGE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1125) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1126) } else if (is_dir && ovl_dentry_is_whiteout(new)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1127) flags |= RENAME_EXCHANGE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1128) cleanup_whiteout = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1129) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1130) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1131)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1132) err = ovl_want_write(old);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1133) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1134) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1135)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1136) err = ovl_copy_up(old);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1137) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1138) goto out_drop_write;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1139)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1140) err = ovl_copy_up(new->d_parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1141) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1142) goto out_drop_write;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1143) if (!overwrite) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1144) err = ovl_copy_up(new);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1145) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1146) goto out_drop_write;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1147) } else if (d_inode(new)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1148) err = ovl_nlink_start(new);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1149) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1150) goto out_drop_write;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1151)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1152) update_nlink = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1153) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1154)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1155) old_cred = ovl_override_creds(old->d_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1156)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1157) if (!list_empty(&list)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1158) opaquedir = ovl_clear_empty(new, &list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1159) err = PTR_ERR(opaquedir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1160) if (IS_ERR(opaquedir)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1161) opaquedir = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1162) goto out_revert_creds;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1163) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1164) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1165)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1166) old_upperdir = ovl_dentry_upper(old->d_parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1167) new_upperdir = ovl_dentry_upper(new->d_parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1168)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1169) if (!samedir) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1170) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1171) * When moving a merge dir or non-dir with copy up origin into
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1172) * a new parent, we are marking the new parent dir "impure".
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1173) * When ovl_iterate() iterates an "impure" upper dir, it will
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1174) * lookup the origin inodes of the entries to fill d_ino.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1175) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1176) if (ovl_type_origin(old)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1177) err = ovl_set_impure(new->d_parent, new_upperdir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1178) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1179) goto out_revert_creds;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1180) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1181) if (!overwrite && ovl_type_origin(new)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1182) err = ovl_set_impure(old->d_parent, old_upperdir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1183) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1184) goto out_revert_creds;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1185) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1186) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1187)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1188) trap = lock_rename(new_upperdir, old_upperdir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1189)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1190) olddentry = lookup_one_len(old->d_name.name, old_upperdir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1191) old->d_name.len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1192) err = PTR_ERR(olddentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1193) if (IS_ERR(olddentry))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1194) goto out_unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1195)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1196) err = -ESTALE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1197) if (!ovl_matches_upper(old, olddentry))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1198) goto out_dput_old;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1199)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1200) newdentry = lookup_one_len(new->d_name.name, new_upperdir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1201) new->d_name.len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1202) err = PTR_ERR(newdentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1203) if (IS_ERR(newdentry))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1204) goto out_dput_old;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1205)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1206) old_opaque = ovl_dentry_is_opaque(old);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1207) new_opaque = ovl_dentry_is_opaque(new);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1208)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1209) err = -ESTALE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1210) if (d_inode(new) && ovl_dentry_upper(new)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1211) if (opaquedir) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1212) if (newdentry != opaquedir)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1213) goto out_dput;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1214) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1215) if (!ovl_matches_upper(new, newdentry))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1216) goto out_dput;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1217) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1218) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1219) if (!d_is_negative(newdentry)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1220) if (!new_opaque || !ovl_is_whiteout(newdentry))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1221) goto out_dput;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1222) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1223) if (flags & RENAME_EXCHANGE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1224) goto out_dput;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1225) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1226) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1227)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1228) if (olddentry == trap)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1229) goto out_dput;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1230) if (newdentry == trap)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1231) goto out_dput;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1232)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1233) if (olddentry->d_inode == newdentry->d_inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1234) goto out_dput;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1235)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1236) err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1237) if (ovl_type_merge_or_lower(old))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1238) err = ovl_set_redirect(old, samedir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1239) else if (is_dir && !old_opaque && ovl_type_merge(new->d_parent))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1240) err = ovl_set_opaque_xerr(old, olddentry, -EXDEV);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1241) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1242) goto out_dput;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1243)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1244) if (!overwrite && ovl_type_merge_or_lower(new))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1245) err = ovl_set_redirect(new, samedir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1246) else if (!overwrite && new_is_dir && !new_opaque &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1247) ovl_type_merge(old->d_parent))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1248) err = ovl_set_opaque_xerr(new, newdentry, -EXDEV);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1249) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1250) goto out_dput;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1251)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1252) err = ovl_do_rename(old_upperdir->d_inode, olddentry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1253) new_upperdir->d_inode, newdentry, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1254) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1255) goto out_dput;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1256)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1257) if (cleanup_whiteout)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1258) ovl_cleanup(old_upperdir->d_inode, newdentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1259)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1260) if (overwrite && d_inode(new)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1261) if (new_is_dir)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1262) clear_nlink(d_inode(new));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1263) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1264) ovl_drop_nlink(new);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1265) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1266)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1267) ovl_dir_modified(old->d_parent, ovl_type_origin(old) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1268) (!overwrite && ovl_type_origin(new)));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1269) ovl_dir_modified(new->d_parent, ovl_type_origin(old) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1270) (d_inode(new) && ovl_type_origin(new)));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1271)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1272) /* copy ctime: */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1273) ovl_copyattr(d_inode(olddentry), d_inode(old));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1274) if (d_inode(new) && ovl_dentry_upper(new))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1275) ovl_copyattr(d_inode(newdentry), d_inode(new));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1276)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1277) out_dput:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1278) dput(newdentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1279) out_dput_old:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1280) dput(olddentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1281) out_unlock:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1282) unlock_rename(new_upperdir, old_upperdir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1283) out_revert_creds:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1284) ovl_revert_creds(old->d_sb, old_cred);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1285) if (update_nlink)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1286) ovl_nlink_end(new);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1287) out_drop_write:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1288) ovl_drop_write(old);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1289) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1290) dput(opaquedir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1291) ovl_cache_free(&list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1292) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1293) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1294)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1295) const struct inode_operations ovl_dir_inode_operations = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1296) .lookup = ovl_lookup,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1297) .mkdir = ovl_mkdir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1298) .symlink = ovl_symlink,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1299) .unlink = ovl_unlink,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1300) .rmdir = ovl_rmdir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1301) .rename = ovl_rename,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1302) .link = ovl_link,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1303) .setattr = ovl_setattr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1304) .create = ovl_create,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1305) .mknod = ovl_mknod,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1306) .permission = ovl_permission,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1307) .getattr = ovl_getattr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1308) .listxattr = ovl_listxattr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1309) .get_acl = ovl_get_acl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1310) .update_time = ovl_update_time,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1311) };
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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