^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) * Copyright (C) 2016 Red Hat, Inc.
^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) struct ovl_config {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) char *lowerdir;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) char *upperdir;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) char *workdir;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) bool default_permissions;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) bool redirect_dir;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) bool redirect_follow;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) const char *redirect_mode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) bool index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) bool nfs_export;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) int xino;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) bool metacopy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) bool ovl_volatile;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) bool override_creds;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) struct ovl_sb {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) struct super_block *sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) dev_t pseudo_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) /* Unusable (conflicting) uuid */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) bool bad_uuid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) /* Used as a lower layer (but maybe also as upper) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) bool is_lower;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) struct ovl_layer {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) struct vfsmount *mnt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) /* Trap in ovl inode cache */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) struct inode *trap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) struct ovl_sb *fs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) /* Index of this layer in fs root (upper idx == 0) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) int idx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) /* One fsid per unique underlying sb (upper fsid == 0) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) int fsid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) struct ovl_path {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) const struct ovl_layer *layer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) struct dentry *dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) /* private information held for overlayfs's superblock */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) struct ovl_fs {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) unsigned int numlayer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) /* Number of unique fs among layers including upper fs */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) unsigned int numfs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) const struct ovl_layer *layers;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) struct ovl_sb *fs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) /* workbasedir is the path at workdir= mount option */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) struct dentry *workbasedir;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) /* workdir is the 'work' directory under workbasedir */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) struct dentry *workdir;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) /* index directory listing overlay inodes by origin file handle */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) struct dentry *indexdir;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) long namelen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) /* pathnames of lower and upper dirs, for show_options */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) struct ovl_config config;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) /* creds of process who forced instantiation of super block */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) const struct cred *creator_cred;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) bool tmpfile;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) bool noxattr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) /* Did we take the inuse lock? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) bool upperdir_locked;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) bool workdir_locked;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) bool share_whiteout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) /* Traps in ovl inode cache */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) struct inode *workbasedir_trap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) struct inode *workdir_trap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) struct inode *indexdir_trap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) /* -1: disabled, 0: same fs, 1..32: number of unused ino bits */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) int xino_mode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) /* For allocation of non-persistent inode numbers */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) atomic_long_t last_ino;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) /* Whiteout dentry cache */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) struct dentry *whiteout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) /* r/o snapshot of upperdir sb's only taken on volatile mounts */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) errseq_t errseq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) static inline struct vfsmount *ovl_upper_mnt(struct ovl_fs *ofs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) return ofs->layers[0].mnt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) static inline struct ovl_fs *OVL_FS(struct super_block *sb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) return (struct ovl_fs *)sb->s_fs_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) static inline bool ovl_should_sync(struct ovl_fs *ofs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) return !ofs->config.ovl_volatile;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) /* private information held for every overlayfs dentry */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) struct ovl_entry {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) union {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) struct {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) struct rcu_head rcu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) unsigned numlower;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) struct ovl_path lowerstack[];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) struct ovl_entry *ovl_alloc_entry(unsigned int numlower);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) static inline struct ovl_entry *OVL_E(struct dentry *dentry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) return (struct ovl_entry *) dentry->d_fsdata;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) struct ovl_inode {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) union {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) struct ovl_dir_cache *cache; /* directory */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) struct inode *lowerdata; /* regular file */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) const char *redirect;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) u64 version;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) struct inode vfs_inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) struct dentry *__upperdentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) struct inode *lower;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) /* synchronize copy up and more */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) struct mutex lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) static inline struct ovl_inode *OVL_I(struct inode *inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) return container_of(inode, struct ovl_inode, vfs_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) static inline struct dentry *ovl_upperdentry_dereference(struct ovl_inode *oi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) return READ_ONCE(oi->__upperdentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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