^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /* AFS dynamic root handling
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Copyright (C) 2018 Red Hat, Inc. All Rights Reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Written by David Howells (dhowells@redhat.com)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/namei.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/dns_resolver.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include "internal.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) static atomic_t afs_autocell_ino;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) * iget5() comparator for inode created by autocell operations
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) * These pseudo inodes don't match anything.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) static int afs_iget5_pseudo_test(struct inode *inode, void *opaque)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) * iget5() inode initialiser
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) static int afs_iget5_pseudo_set(struct inode *inode, void *opaque)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) struct afs_super_info *as = AFS_FS_S(inode->i_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) struct afs_vnode *vnode = AFS_FS_I(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) struct afs_fid *fid = opaque;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) vnode->volume = as->volume;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) vnode->fid = *fid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) inode->i_ino = fid->vnode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) inode->i_generation = fid->unique;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) }
^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) * Create an inode for a dynamic root directory or an autocell dynamic
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) * automount dir.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) struct inode *afs_iget_pseudo_dir(struct super_block *sb, bool root)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) struct afs_super_info *as = AFS_FS_S(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) struct afs_vnode *vnode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) struct inode *inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) struct afs_fid fid = {};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) _enter("");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) if (as->volume)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) fid.vid = as->volume->vid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) if (root) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) fid.vnode = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) fid.unique = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) fid.vnode = atomic_inc_return(&afs_autocell_ino);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) fid.unique = 0;
^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) inode = iget5_locked(sb, fid.vnode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) afs_iget5_pseudo_test, afs_iget5_pseudo_set, &fid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) if (!inode) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) _leave(" = -ENOMEM");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) return ERR_PTR(-ENOMEM);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) _debug("GOT INODE %p { ino=%lu, vl=%llx, vn=%llx, u=%x }",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) inode, inode->i_ino, fid.vid, fid.vnode, fid.unique);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) vnode = AFS_FS_I(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) /* there shouldn't be an existing inode */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) BUG_ON(!(inode->i_state & I_NEW));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) inode->i_size = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) if (root) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) inode->i_op = &afs_dynroot_inode_operations;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) inode->i_fop = &simple_dir_operations;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) inode->i_op = &afs_autocell_inode_operations;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) set_nlink(inode, 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) inode->i_uid = GLOBAL_ROOT_UID;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) inode->i_gid = GLOBAL_ROOT_GID;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) inode->i_ctime = inode->i_atime = inode->i_mtime = current_time(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) inode->i_blocks = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) inode->i_generation = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) set_bit(AFS_VNODE_PSEUDODIR, &vnode->flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) if (!root) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) set_bit(AFS_VNODE_MOUNTPOINT, &vnode->flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) inode->i_flags |= S_AUTOMOUNT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) inode->i_flags |= S_NOATIME;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) unlock_new_inode(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) _leave(" = %p", inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) return inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) * Probe to see if a cell may exist. This prevents positive dentries from
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) * being created unnecessarily.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) static int afs_probe_cell_name(struct dentry *dentry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) struct afs_cell *cell;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) struct afs_net *net = afs_d2net(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) const char *name = dentry->d_name.name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) size_t len = dentry->d_name.len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) /* Names prefixed with a dot are R/W mounts. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) if (name[0] == '.') {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) if (len == 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) name++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) len--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) cell = afs_find_cell(net, name, len, afs_cell_trace_use_probe);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) if (!IS_ERR(cell)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) afs_unuse_cell(net, cell, afs_cell_trace_unuse_probe);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) ret = dns_query(net->net, "afsdb", name, len, "srv=1",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) NULL, NULL, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) if (ret == -ENODATA)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) ret = -EDESTADDRREQ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) }
^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) * Try to auto mount the mountpoint with pseudo directory, if the autocell
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) * operation is setted.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) struct inode *afs_try_auto_mntpt(struct dentry *dentry, struct inode *dir)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) struct afs_vnode *vnode = AFS_FS_I(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) struct inode *inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) int ret = -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) _enter("%p{%pd}, {%llx:%llu}",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) dentry, dentry, vnode->fid.vid, vnode->fid.vnode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) if (!test_bit(AFS_VNODE_AUTOCELL, &vnode->flags))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) ret = afs_probe_cell_name(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) inode = afs_iget_pseudo_dir(dir->i_sb, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) if (IS_ERR(inode)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) ret = PTR_ERR(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) _leave("= %p", inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) return inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) _leave("= %d", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) return ret == -ENOENT ? NULL : ERR_PTR(ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) * Look up @cell in a dynroot directory. This is a substitution for the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) * local cell name for the net namespace.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) static struct dentry *afs_lookup_atcell(struct dentry *dentry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) struct afs_cell *cell;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) struct afs_net *net = afs_d2net(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) struct dentry *ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) char *name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) int len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) if (!net->ws_cell)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) return ERR_PTR(-ENOENT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) ret = ERR_PTR(-ENOMEM);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) name = kmalloc(AFS_MAXCELLNAME + 1, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) if (!name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) goto out_p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) down_read(&net->cells_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) cell = net->ws_cell;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) if (cell) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) len = cell->name_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) memcpy(name, cell->name, len + 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) up_read(&net->cells_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) ret = ERR_PTR(-ENOENT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) if (!cell)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) goto out_n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) ret = lookup_one_len(name, dentry->d_parent, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) /* We don't want to d_add() the @cell dentry here as we don't want to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) * the cached dentry to hide changes to the local cell name.
^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) out_n:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) kfree(name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) out_p:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) * Look up an entry in a dynroot directory.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) static struct dentry *afs_dynroot_lookup(struct inode *dir, struct dentry *dentry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) unsigned int flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) _enter("%pd", dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) ASSERTCMP(d_inode(dentry), ==, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) if (flags & LOOKUP_CREATE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) return ERR_PTR(-EOPNOTSUPP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) if (dentry->d_name.len >= AFSNAMEMAX) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) _leave(" = -ENAMETOOLONG");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) return ERR_PTR(-ENAMETOOLONG);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) if (dentry->d_name.len == 5 &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) memcmp(dentry->d_name.name, "@cell", 5) == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) return afs_lookup_atcell(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) return d_splice_alias(afs_try_auto_mntpt(dentry, dir), dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) const struct inode_operations afs_dynroot_inode_operations = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) .lookup = afs_dynroot_lookup,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) };
^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) * Dirs in the dynamic root don't need revalidation.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) static int afs_dynroot_d_revalidate(struct dentry *dentry, unsigned int flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) return 1;
^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) * Allow the VFS to enquire as to whether a dentry should be unhashed (mustn't
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) * sleep)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) * - called from dput() when d_count is going to 0.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) * - return 1 to request dentry be unhashed, 0 otherwise
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) static int afs_dynroot_d_delete(const struct dentry *dentry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) return d_really_is_positive(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) const struct dentry_operations afs_dynroot_dentry_operations = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) .d_revalidate = afs_dynroot_d_revalidate,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) .d_delete = afs_dynroot_d_delete,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) .d_release = afs_d_release,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) .d_automount = afs_d_automount,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) * Create a manually added cell mount directory.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) * - The caller must hold net->proc_cells_lock
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) int afs_dynroot_mkdir(struct afs_net *net, struct afs_cell *cell)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) struct super_block *sb = net->dynroot_sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) struct dentry *root, *subdir;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) if (!sb || atomic_read(&sb->s_active) == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) /* Let the ->lookup op do the creation */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) root = sb->s_root;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) inode_lock(root->d_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) subdir = lookup_one_len(cell->name, root, cell->name_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) if (IS_ERR(subdir)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) ret = PTR_ERR(subdir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) goto unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) /* Note that we're retaining an extra ref on the dentry */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) subdir->d_fsdata = (void *)1UL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) unlock:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) inode_unlock(root->d_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) return ret;
^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) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) * Remove a manually added cell mount directory.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) * - The caller must hold net->proc_cells_lock
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) void afs_dynroot_rmdir(struct afs_net *net, struct afs_cell *cell)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) struct super_block *sb = net->dynroot_sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) struct dentry *root, *subdir;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) if (!sb || atomic_read(&sb->s_active) == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) root = sb->s_root;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) inode_lock(root->d_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) /* Don't want to trigger a lookup call, which will re-add the cell */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) subdir = try_lookup_one_len(cell->name, root, cell->name_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) if (IS_ERR_OR_NULL(subdir)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) _debug("lookup %ld", PTR_ERR(subdir));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) goto no_dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) _debug("rmdir %pd %u", subdir, d_count(subdir));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) if (subdir->d_fsdata) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) _debug("unpin %u", d_count(subdir));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) subdir->d_fsdata = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) dput(subdir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) dput(subdir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) no_dentry:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) inode_unlock(root->d_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) _leave("");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) * Populate a newly created dynamic root with cell names.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) int afs_dynroot_populate(struct super_block *sb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) struct afs_cell *cell;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) struct afs_net *net = afs_sb2net(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) mutex_lock(&net->proc_cells_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) net->dynroot_sb = sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) hlist_for_each_entry(cell, &net->proc_cells, proc_link) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) ret = afs_dynroot_mkdir(net, cell);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) mutex_unlock(&net->proc_cells_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) error:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) net->dynroot_sb = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) * When a dynamic root that's in the process of being destroyed, depopulate it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) * of pinned directories.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) void afs_dynroot_depopulate(struct super_block *sb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) struct afs_net *net = afs_sb2net(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) struct dentry *root = sb->s_root, *subdir, *tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) /* Prevent more subdirs from being created */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) mutex_lock(&net->proc_cells_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) if (net->dynroot_sb == sb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) net->dynroot_sb = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) mutex_unlock(&net->proc_cells_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) if (root) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) inode_lock(root->d_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) /* Remove all the pins for dirs created for manually added cells */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) list_for_each_entry_safe(subdir, tmp, &root->d_subdirs, d_child) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) if (subdir->d_fsdata) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) subdir->d_fsdata = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) dput(subdir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) inode_unlock(root->d_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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