1d2912cb1SThomas Gleixner /* SPDX-License-Identifier: GPL-2.0-only */ 2e9be9d5eSMiklos Szeredi /* 3e9be9d5eSMiklos Szeredi * 4e9be9d5eSMiklos Szeredi * Copyright (C) 2011 Novell Inc. 5e9be9d5eSMiklos Szeredi */ 6e9be9d5eSMiklos Szeredi 7e9be9d5eSMiklos Szeredi #include <linux/kernel.h> 83a1e819bSAmir Goldstein #include <linux/uuid.h> 946e5d0a3SMiklos Szeredi #include <linux/fs.h> 10ee023c30SAmir Goldstein #include "ovl_entry.h" 11e9be9d5eSMiklos Szeredi 12e9be9d5eSMiklos Szeredi enum ovl_path_type { 1338e813dbSMiklos Szeredi __OVL_PATH_UPPER = (1 << 0), 1438e813dbSMiklos Szeredi __OVL_PATH_MERGE = (1 << 1), 1559548503SAmir Goldstein __OVL_PATH_ORIGIN = (1 << 2), 16e9be9d5eSMiklos Szeredi }; 17e9be9d5eSMiklos Szeredi 181afaba1eSMiklos Szeredi #define OVL_TYPE_UPPER(type) ((type) & __OVL_PATH_UPPER) 191afaba1eSMiklos Szeredi #define OVL_TYPE_MERGE(type) ((type) & __OVL_PATH_MERGE) 2059548503SAmir Goldstein #define OVL_TYPE_ORIGIN(type) ((type) & __OVL_PATH_ORIGIN) 21d837a49bSMiklos Szeredi 22fe2b7595SAndreas Gruenbacher #define OVL_XATTR_PREFIX XATTR_TRUSTED_PREFIX "overlay." 23fe2b7595SAndreas Gruenbacher #define OVL_XATTR_OPAQUE OVL_XATTR_PREFIX "opaque" 2402b69b28SMiklos Szeredi #define OVL_XATTR_REDIRECT OVL_XATTR_PREFIX "redirect" 253a1e819bSAmir Goldstein #define OVL_XATTR_ORIGIN OVL_XATTR_PREFIX "origin" 26ee1d6d37SAmir Goldstein #define OVL_XATTR_IMPURE OVL_XATTR_PREFIX "impure" 275f8415d6SAmir Goldstein #define OVL_XATTR_NLINK OVL_XATTR_PREFIX "nlink" 28ad1d615cSAmir Goldstein #define OVL_XATTR_UPPER OVL_XATTR_PREFIX "upper" 290c288874SVivek Goyal #define OVL_XATTR_METACOPY OVL_XATTR_PREFIX "metacopy" 303a1e819bSAmir Goldstein 31c62520a8SAmir Goldstein enum ovl_inode_flag { 32b79e05aaSAmir Goldstein /* Pure upper dir that may contain non pure upper entries */ 3313c72075SMiklos Szeredi OVL_IMPURE, 34b79e05aaSAmir Goldstein /* Non-merge dir that may contain whiteout entries */ 35b79e05aaSAmir Goldstein OVL_WHITEOUTS, 36359f392cSAmir Goldstein OVL_INDEX, 370c288874SVivek Goyal OVL_UPPERDATA, 38a00c2d59SVivek Goyal /* Inode number will remain constant over copy up. */ 39a00c2d59SVivek Goyal OVL_CONST_INO, 4013c72075SMiklos Szeredi }; 4113c72075SMiklos Szeredi 42c62520a8SAmir Goldstein enum ovl_entry_flag { 43c62520a8SAmir Goldstein OVL_E_UPPER_ALIAS, 44c62520a8SAmir Goldstein OVL_E_OPAQUE, 452ca3c148SAmir Goldstein OVL_E_CONNECTED, 46c62520a8SAmir Goldstein }; 47c62520a8SAmir Goldstein 483a1e819bSAmir Goldstein /* 493a1e819bSAmir Goldstein * The tuple (fh,uuid) is a universal unique identifier for a copy up origin, 503a1e819bSAmir Goldstein * where: 513a1e819bSAmir Goldstein * origin.fh - exported file handle of the lower file 523a1e819bSAmir Goldstein * origin.uuid - uuid of the lower filesystem 533a1e819bSAmir Goldstein */ 543a1e819bSAmir Goldstein #define OVL_FH_VERSION 0 553a1e819bSAmir Goldstein #define OVL_FH_MAGIC 0xfb 563a1e819bSAmir Goldstein 573a1e819bSAmir Goldstein /* CPU byte order required for fid decoding: */ 583a1e819bSAmir Goldstein #define OVL_FH_FLAG_BIG_ENDIAN (1 << 0) 593a1e819bSAmir Goldstein #define OVL_FH_FLAG_ANY_ENDIAN (1 << 1) 6054fb347eSAmir Goldstein /* Is the real inode encoded in fid an upper inode? */ 6154fb347eSAmir Goldstein #define OVL_FH_FLAG_PATH_UPPER (1 << 2) 623a1e819bSAmir Goldstein 63961af647SAmir Goldstein #define OVL_FH_FLAG_ALL (OVL_FH_FLAG_BIG_ENDIAN | OVL_FH_FLAG_ANY_ENDIAN | \ 64961af647SAmir Goldstein OVL_FH_FLAG_PATH_UPPER) 653a1e819bSAmir Goldstein 663a1e819bSAmir Goldstein #if defined(__LITTLE_ENDIAN) 673a1e819bSAmir Goldstein #define OVL_FH_FLAG_CPU_ENDIAN 0 683a1e819bSAmir Goldstein #elif defined(__BIG_ENDIAN) 693a1e819bSAmir Goldstein #define OVL_FH_FLAG_CPU_ENDIAN OVL_FH_FLAG_BIG_ENDIAN 703a1e819bSAmir Goldstein #else 713a1e819bSAmir Goldstein #error Endianness not defined 723a1e819bSAmir Goldstein #endif 733a1e819bSAmir Goldstein 748ed5eec9SAmir Goldstein /* The type returned by overlay exportfs ops when encoding an ovl_fh handle */ 758ed5eec9SAmir Goldstein #define OVL_FILEID 0xfb 768ed5eec9SAmir Goldstein 773a1e819bSAmir Goldstein /* On-disk and in-memeory format for redirect by file handle */ 783a1e819bSAmir Goldstein struct ovl_fh { 793a1e819bSAmir Goldstein u8 version; /* 0 */ 803a1e819bSAmir Goldstein u8 magic; /* 0xfb */ 813a1e819bSAmir Goldstein u8 len; /* size of this header + size of fid */ 823a1e819bSAmir Goldstein u8 flags; /* OVL_FH_FLAG_* */ 833a1e819bSAmir Goldstein u8 type; /* fid_type of fid */ 8401633fd2SChristoph Hellwig uuid_t uuid; /* uuid of filesystem */ 853a1e819bSAmir Goldstein u8 fid[0]; /* file identifier */ 863a1e819bSAmir Goldstein } __packed; 87e9be9d5eSMiklos Szeredi 88e9be9d5eSMiklos Szeredi static inline int ovl_do_rmdir(struct inode *dir, struct dentry *dentry) 89e9be9d5eSMiklos Szeredi { 90e9be9d5eSMiklos Szeredi int err = vfs_rmdir(dir, dentry); 916cf00764SAmir Goldstein 92e9be9d5eSMiklos Szeredi pr_debug("rmdir(%pd2) = %i\n", dentry, err); 93e9be9d5eSMiklos Szeredi return err; 94e9be9d5eSMiklos Szeredi } 95e9be9d5eSMiklos Szeredi 96e9be9d5eSMiklos Szeredi static inline int ovl_do_unlink(struct inode *dir, struct dentry *dentry) 97e9be9d5eSMiklos Szeredi { 98e9be9d5eSMiklos Szeredi int err = vfs_unlink(dir, dentry, NULL); 996cf00764SAmir Goldstein 100e9be9d5eSMiklos Szeredi pr_debug("unlink(%pd2) = %i\n", dentry, err); 101e9be9d5eSMiklos Szeredi return err; 102e9be9d5eSMiklos Szeredi } 103e9be9d5eSMiklos Szeredi 104e9be9d5eSMiklos Szeredi static inline int ovl_do_link(struct dentry *old_dentry, struct inode *dir, 1056cf00764SAmir Goldstein struct dentry *new_dentry) 106e9be9d5eSMiklos Szeredi { 107e9be9d5eSMiklos Szeredi int err = vfs_link(old_dentry, dir, new_dentry, NULL); 1086cf00764SAmir Goldstein 1096cf00764SAmir Goldstein pr_debug("link(%pd2, %pd2) = %i\n", old_dentry, new_dentry, err); 110e9be9d5eSMiklos Szeredi return err; 111e9be9d5eSMiklos Szeredi } 112e9be9d5eSMiklos Szeredi 113e9be9d5eSMiklos Szeredi static inline int ovl_do_create(struct inode *dir, struct dentry *dentry, 1146cf00764SAmir Goldstein umode_t mode) 115e9be9d5eSMiklos Szeredi { 116e9be9d5eSMiklos Szeredi int err = vfs_create(dir, dentry, mode, true); 1176cf00764SAmir Goldstein 118e9be9d5eSMiklos Szeredi pr_debug("create(%pd2, 0%o) = %i\n", dentry, mode, err); 119e9be9d5eSMiklos Szeredi return err; 120e9be9d5eSMiklos Szeredi } 121e9be9d5eSMiklos Szeredi 122e9be9d5eSMiklos Szeredi static inline int ovl_do_mkdir(struct inode *dir, struct dentry *dentry, 1236cf00764SAmir Goldstein umode_t mode) 124e9be9d5eSMiklos Szeredi { 125e9be9d5eSMiklos Szeredi int err = vfs_mkdir(dir, dentry, mode); 126e9be9d5eSMiklos Szeredi pr_debug("mkdir(%pd2, 0%o) = %i\n", dentry, mode, err); 127e9be9d5eSMiklos Szeredi return err; 128e9be9d5eSMiklos Szeredi } 129e9be9d5eSMiklos Szeredi 130e9be9d5eSMiklos Szeredi static inline int ovl_do_mknod(struct inode *dir, struct dentry *dentry, 1316cf00764SAmir Goldstein umode_t mode, dev_t dev) 132e9be9d5eSMiklos Szeredi { 133e9be9d5eSMiklos Szeredi int err = vfs_mknod(dir, dentry, mode, dev); 1346cf00764SAmir Goldstein 1356cf00764SAmir Goldstein pr_debug("mknod(%pd2, 0%o, 0%o) = %i\n", dentry, mode, dev, err); 136e9be9d5eSMiklos Szeredi return err; 137e9be9d5eSMiklos Szeredi } 138e9be9d5eSMiklos Szeredi 139e9be9d5eSMiklos Szeredi static inline int ovl_do_symlink(struct inode *dir, struct dentry *dentry, 1406cf00764SAmir Goldstein const char *oldname) 141e9be9d5eSMiklos Szeredi { 142e9be9d5eSMiklos Szeredi int err = vfs_symlink(dir, dentry, oldname); 1436cf00764SAmir Goldstein 144e9be9d5eSMiklos Szeredi pr_debug("symlink(\"%s\", %pd2) = %i\n", oldname, dentry, err); 145e9be9d5eSMiklos Szeredi return err; 146e9be9d5eSMiklos Szeredi } 147e9be9d5eSMiklos Szeredi 148e9be9d5eSMiklos Szeredi static inline int ovl_do_setxattr(struct dentry *dentry, const char *name, 149e9be9d5eSMiklos Szeredi const void *value, size_t size, int flags) 150e9be9d5eSMiklos Szeredi { 151e9be9d5eSMiklos Szeredi int err = vfs_setxattr(dentry, name, value, size, flags); 1521a8f8d2aSMiklos Szeredi pr_debug("setxattr(%pd2, \"%s\", \"%*pE\", %zu, 0x%x) = %i\n", 1531a8f8d2aSMiklos Szeredi dentry, name, min((int)size, 48), value, size, flags, err); 154e9be9d5eSMiklos Szeredi return err; 155e9be9d5eSMiklos Szeredi } 156e9be9d5eSMiklos Szeredi 157e9be9d5eSMiklos Szeredi static inline int ovl_do_removexattr(struct dentry *dentry, const char *name) 158e9be9d5eSMiklos Szeredi { 159e9be9d5eSMiklos Szeredi int err = vfs_removexattr(dentry, name); 160e9be9d5eSMiklos Szeredi pr_debug("removexattr(%pd2, \"%s\") = %i\n", dentry, name, err); 161e9be9d5eSMiklos Szeredi return err; 162e9be9d5eSMiklos Szeredi } 163e9be9d5eSMiklos Szeredi 164e9be9d5eSMiklos Szeredi static inline int ovl_do_rename(struct inode *olddir, struct dentry *olddentry, 165e9be9d5eSMiklos Szeredi struct inode *newdir, struct dentry *newdentry, 166e9be9d5eSMiklos Szeredi unsigned int flags) 167e9be9d5eSMiklos Szeredi { 168e9be9d5eSMiklos Szeredi int err; 169e9be9d5eSMiklos Szeredi 1706cf00764SAmir Goldstein pr_debug("rename(%pd2, %pd2, 0x%x)\n", olddentry, newdentry, flags); 171e9be9d5eSMiklos Szeredi err = vfs_rename(olddir, olddentry, newdir, newdentry, NULL, flags); 172e9be9d5eSMiklos Szeredi if (err) { 1732773bf00SMiklos Szeredi pr_debug("...rename(%pd2, %pd2, ...) = %i\n", 174e9be9d5eSMiklos Szeredi olddentry, newdentry, err); 175e9be9d5eSMiklos Szeredi } 176e9be9d5eSMiklos Szeredi return err; 177e9be9d5eSMiklos Szeredi } 178e9be9d5eSMiklos Szeredi 179e9be9d5eSMiklos Szeredi static inline int ovl_do_whiteout(struct inode *dir, struct dentry *dentry) 180e9be9d5eSMiklos Szeredi { 181e9be9d5eSMiklos Szeredi int err = vfs_whiteout(dir, dentry); 182e9be9d5eSMiklos Szeredi pr_debug("whiteout(%pd2) = %i\n", dentry, err); 183e9be9d5eSMiklos Szeredi return err; 184e9be9d5eSMiklos Szeredi } 185e9be9d5eSMiklos Szeredi 186e7f52429SAmir Goldstein static inline struct dentry *ovl_do_tmpfile(struct dentry *dentry, umode_t mode) 187e7f52429SAmir Goldstein { 188e7f52429SAmir Goldstein struct dentry *ret = vfs_tmpfile(dentry, mode, 0); 1897879cb43SVasyl Gomonovych int err = PTR_ERR_OR_ZERO(ret); 190e7f52429SAmir Goldstein 191e7f52429SAmir Goldstein pr_debug("tmpfile(%pd2, 0%o) = %i\n", dentry, mode, err); 192e7f52429SAmir Goldstein return ret; 193e7f52429SAmir Goldstein } 194e7f52429SAmir Goldstein 1950c288874SVivek Goyal static inline bool ovl_open_flags_need_copy_up(int flags) 1960c288874SVivek Goyal { 1970c288874SVivek Goyal if (!flags) 1980c288874SVivek Goyal return false; 1990c288874SVivek Goyal 2000c288874SVivek Goyal return ((OPEN_FMODE(flags) & FMODE_WRITE) || (flags & O_TRUNC)); 2010c288874SVivek Goyal } 2020c288874SVivek Goyal 203bbb1e54dSMiklos Szeredi /* util.c */ 204bbb1e54dSMiklos Szeredi int ovl_want_write(struct dentry *dentry); 205bbb1e54dSMiklos Szeredi void ovl_drop_write(struct dentry *dentry); 206bbb1e54dSMiklos Szeredi struct dentry *ovl_workdir(struct dentry *dentry); 207bbb1e54dSMiklos Szeredi const struct cred *ovl_override_creds(struct super_block *sb); 2087bcd74b9SAmir Goldstein struct super_block *ovl_same_sb(struct super_block *sb); 209e487d889SAmir Goldstein int ovl_can_decode_fh(struct super_block *sb); 21002bcd157SAmir Goldstein struct dentry *ovl_indexdir(struct super_block *sb); 211f168f109SAmir Goldstein bool ovl_index_all(struct super_block *sb); 212f168f109SAmir Goldstein bool ovl_verify_lower(struct super_block *sb); 213bbb1e54dSMiklos Szeredi struct ovl_entry *ovl_alloc_entry(unsigned int numlower); 214bbb1e54dSMiklos Szeredi bool ovl_dentry_remote(struct dentry *dentry); 215bbb1e54dSMiklos Szeredi bool ovl_dentry_weird(struct dentry *dentry); 216e9be9d5eSMiklos Szeredi enum ovl_path_type ovl_path_type(struct dentry *dentry); 217e9be9d5eSMiklos Szeredi void ovl_path_upper(struct dentry *dentry, struct path *path); 218e9be9d5eSMiklos Szeredi void ovl_path_lower(struct dentry *dentry, struct path *path); 2194f93b426SVivek Goyal void ovl_path_lowerdata(struct dentry *dentry, struct path *path); 220e9be9d5eSMiklos Szeredi enum ovl_path_type ovl_path_real(struct dentry *dentry, struct path *path); 221e9be9d5eSMiklos Szeredi struct dentry *ovl_dentry_upper(struct dentry *dentry); 222e9be9d5eSMiklos Szeredi struct dentry *ovl_dentry_lower(struct dentry *dentry); 223647d253fSVivek Goyal struct dentry *ovl_dentry_lowerdata(struct dentry *dentry); 224da309e8cSAmir Goldstein struct ovl_layer *ovl_layer_lower(struct dentry *dentry); 225e9be9d5eSMiklos Szeredi struct dentry *ovl_dentry_real(struct dentry *dentry); 2261d88f183SMiklos Szeredi struct dentry *ovl_i_dentry_upper(struct inode *inode); 22709d8b586SMiklos Szeredi struct inode *ovl_inode_upper(struct inode *inode); 22809d8b586SMiklos Szeredi struct inode *ovl_inode_lower(struct inode *inode); 2292664bd08SVivek Goyal struct inode *ovl_inode_lowerdata(struct inode *inode); 23009d8b586SMiklos Szeredi struct inode *ovl_inode_real(struct inode *inode); 2314823d49cSVivek Goyal struct inode *ovl_inode_realdata(struct inode *inode); 2324edb83bbSMiklos Szeredi struct ovl_dir_cache *ovl_dir_cache(struct inode *inode); 2334edb83bbSMiklos Szeredi void ovl_set_dir_cache(struct inode *inode, struct ovl_dir_cache *cache); 234c62520a8SAmir Goldstein void ovl_dentry_set_flag(unsigned long flag, struct dentry *dentry); 235c62520a8SAmir Goldstein void ovl_dentry_clear_flag(unsigned long flag, struct dentry *dentry); 236c62520a8SAmir Goldstein bool ovl_dentry_test_flag(unsigned long flag, struct dentry *dentry); 237e9be9d5eSMiklos Szeredi bool ovl_dentry_is_opaque(struct dentry *dentry); 238c412ce49SMiklos Szeredi bool ovl_dentry_is_whiteout(struct dentry *dentry); 2395cf5b477SMiklos Szeredi void ovl_dentry_set_opaque(struct dentry *dentry); 24055acc661SMiklos Szeredi bool ovl_dentry_has_upper_alias(struct dentry *dentry); 24155acc661SMiklos Szeredi void ovl_dentry_set_upper_alias(struct dentry *dentry); 2420c288874SVivek Goyal bool ovl_dentry_needs_data_copy_up(struct dentry *dentry, int flags); 2430c288874SVivek Goyal bool ovl_dentry_needs_data_copy_up_locked(struct dentry *dentry, int flags); 2440c288874SVivek Goyal bool ovl_has_upperdata(struct inode *inode); 2450c288874SVivek Goyal void ovl_set_upperdata(struct inode *inode); 246a6c60655SMiklos Szeredi bool ovl_redirect_dir(struct super_block *sb); 247a6c60655SMiklos Szeredi const char *ovl_dentry_get_redirect(struct dentry *dentry); 248a6c60655SMiklos Szeredi void ovl_dentry_set_redirect(struct dentry *dentry, const char *redirect); 24909d8b586SMiklos Szeredi void ovl_inode_init(struct inode *inode, struct dentry *upperdentry, 2502664bd08SVivek Goyal struct dentry *lowerdentry, struct dentry *lowerdata); 25109d8b586SMiklos Szeredi void ovl_inode_update(struct inode *inode, struct dentry *upperdentry); 252d9854c87SMiklos Szeredi void ovl_dir_modified(struct dentry *dentry, bool impurity); 253bbb1e54dSMiklos Szeredi u64 ovl_dentry_version_get(struct dentry *dentry); 254bbb1e54dSMiklos Szeredi bool ovl_is_whiteout(struct dentry *dentry); 255e9be9d5eSMiklos Szeredi struct file *ovl_path_open(struct path *path, int flags); 2560c288874SVivek Goyal int ovl_copy_up_start(struct dentry *dentry, int flags); 25739d3d60aSAmir Goldstein void ovl_copy_up_end(struct dentry *dentry); 2580c288874SVivek Goyal bool ovl_already_copied_up(struct dentry *dentry, int flags); 259b79e05aaSAmir Goldstein bool ovl_check_origin_xattr(struct dentry *dentry); 260f3a15685SAmir Goldstein bool ovl_check_dir_xattr(struct dentry *dentry, const char *name); 261f3a15685SAmir Goldstein int ovl_check_setxattr(struct dentry *dentry, struct dentry *upperdentry, 262f3a15685SAmir Goldstein const char *name, const void *value, size_t size, 263f3a15685SAmir Goldstein int xerr); 264f3a15685SAmir Goldstein int ovl_set_impure(struct dentry *dentry, struct dentry *upperdentry); 26513c72075SMiklos Szeredi void ovl_set_flag(unsigned long flag, struct inode *inode); 2664edb83bbSMiklos Szeredi void ovl_clear_flag(unsigned long flag, struct inode *inode); 26713c72075SMiklos Szeredi bool ovl_test_flag(unsigned long flag, struct inode *inode); 268ad0af710SAmir Goldstein bool ovl_inuse_trylock(struct dentry *dentry); 269ad0af710SAmir Goldstein void ovl_inuse_unlock(struct dentry *dentry); 270146d62e5SAmir Goldstein bool ovl_is_inuse(struct dentry *dentry); 27124b33ee1SAmir Goldstein bool ovl_need_index(struct dentry *dentry); 2720e32992fSAmir Goldstein int ovl_nlink_start(struct dentry *dentry); 2730e32992fSAmir Goldstein void ovl_nlink_end(struct dentry *dentry); 2745820dc08SAmir Goldstein int ovl_lock_rename_workdir(struct dentry *workdir, struct dentry *upperdir); 2759d3dfea3SVivek Goyal int ovl_check_metacopy_xattr(struct dentry *dentry); 27667d756c2SVivek Goyal bool ovl_is_metacopy_dentry(struct dentry *dentry); 2770a2d0d3fSVivek Goyal char *ovl_get_redirect_xattr(struct dentry *dentry, int padding); 278993a0b2aSVivek Goyal ssize_t ovl_getxattr(struct dentry *dentry, char *name, char **value, 279993a0b2aSVivek Goyal size_t padding); 280f3a15685SAmir Goldstein 281f3a15685SAmir Goldstein static inline bool ovl_is_impuredir(struct dentry *dentry) 282f3a15685SAmir Goldstein { 283f3a15685SAmir Goldstein return ovl_check_dir_xattr(dentry, OVL_XATTR_IMPURE); 284f3a15685SAmir Goldstein } 285f3a15685SAmir Goldstein 286e487d889SAmir Goldstein static inline unsigned int ovl_xino_bits(struct super_block *sb) 287e487d889SAmir Goldstein { 288e487d889SAmir Goldstein struct ovl_fs *ofs = sb->s_fs_info; 289e487d889SAmir Goldstein 290e487d889SAmir Goldstein return ofs->xino_bits; 291e487d889SAmir Goldstein } 292e487d889SAmir Goldstein 2931e92e307SAmir Goldstein static inline int ovl_inode_lock(struct inode *inode) 2941e92e307SAmir Goldstein { 2951e92e307SAmir Goldstein return mutex_lock_interruptible(&OVL_I(inode)->lock); 2961e92e307SAmir Goldstein } 2971e92e307SAmir Goldstein 2981e92e307SAmir Goldstein static inline void ovl_inode_unlock(struct inode *inode) 2991e92e307SAmir Goldstein { 3001e92e307SAmir Goldstein mutex_unlock(&OVL_I(inode)->lock); 3011e92e307SAmir Goldstein } 3021e92e307SAmir Goldstein 303e9be9d5eSMiklos Szeredi 304bbb1e54dSMiklos Szeredi /* namei.c */ 3058556a420SAmir Goldstein int ovl_check_fh_len(struct ovl_fh *fh, int fh_len); 3068a22efa1SAmir Goldstein struct dentry *ovl_decode_real_fh(struct ovl_fh *fh, struct vfsmount *mnt, 3078a22efa1SAmir Goldstein bool connected); 3088a22efa1SAmir Goldstein int ovl_check_origin_fh(struct ovl_fs *ofs, struct ovl_fh *fh, bool connected, 309f941866fSAmir Goldstein struct dentry *upperdentry, struct ovl_path **stackp); 31005122443SAmir Goldstein int ovl_verify_set_fh(struct dentry *dentry, const char *name, 31105122443SAmir Goldstein struct dentry *real, bool is_upper, bool set); 3123b0bfc6eSAmir Goldstein struct dentry *ovl_index_upper(struct ovl_fs *ofs, struct dentry *index); 3131eff1a1dSAmir Goldstein int ovl_verify_index(struct ovl_fs *ofs, struct dentry *index); 314359f392cSAmir Goldstein int ovl_get_index_name(struct dentry *origin, struct qstr *name); 31591ffe7beSAmir Goldstein struct dentry *ovl_get_index_fh(struct ovl_fs *ofs, struct ovl_fh *fh); 31606170154SAmir Goldstein struct dentry *ovl_lookup_index(struct ovl_fs *ofs, struct dentry *upper, 31706170154SAmir Goldstein struct dentry *origin, bool verify); 318bbb1e54dSMiklos Szeredi int ovl_path_next(int idx, struct dentry *dentry, struct path *path); 3191eff1a1dSAmir Goldstein struct dentry *ovl_lookup(struct inode *dir, struct dentry *dentry, 3201eff1a1dSAmir Goldstein unsigned int flags); 321bbb1e54dSMiklos Szeredi bool ovl_lower_positive(struct dentry *dentry); 322e9be9d5eSMiklos Szeredi 32305122443SAmir Goldstein static inline int ovl_verify_origin(struct dentry *upper, 32405122443SAmir Goldstein struct dentry *origin, bool set) 32505122443SAmir Goldstein { 32605122443SAmir Goldstein return ovl_verify_set_fh(upper, OVL_XATTR_ORIGIN, origin, false, set); 32705122443SAmir Goldstein } 32805122443SAmir Goldstein 329ad1d615cSAmir Goldstein static inline int ovl_verify_upper(struct dentry *index, 330ad1d615cSAmir Goldstein struct dentry *upper, bool set) 331ad1d615cSAmir Goldstein { 332ad1d615cSAmir Goldstein return ovl_verify_set_fh(index, OVL_XATTR_UPPER, upper, true, set); 333ad1d615cSAmir Goldstein } 334ad1d615cSAmir Goldstein 335e9be9d5eSMiklos Szeredi /* readdir.c */ 336e9be9d5eSMiklos Szeredi extern const struct file_operations ovl_dir_operations; 337e9be9d5eSMiklos Szeredi int ovl_check_empty_dir(struct dentry *dentry, struct list_head *list); 338e9be9d5eSMiklos Szeredi void ovl_cleanup_whiteouts(struct dentry *upper, struct list_head *list); 339e9be9d5eSMiklos Szeredi void ovl_cache_free(struct list_head *list); 3404edb83bbSMiklos Szeredi void ovl_dir_cache_free(struct inode *inode); 34145aebeafSVivek Goyal int ovl_check_d_type_supported(struct path *realpath); 342eea2fb48SMiklos Szeredi void ovl_workdir_cleanup(struct inode *dir, struct vfsmount *mnt, 343eea2fb48SMiklos Szeredi struct dentry *dentry, int level); 3441eff1a1dSAmir Goldstein int ovl_indexdir_cleanup(struct ovl_fs *ofs); 345e9be9d5eSMiklos Szeredi 346e9be9d5eSMiklos Szeredi /* inode.c */ 3475f8415d6SAmir Goldstein int ovl_set_nlink_upper(struct dentry *dentry); 3485f8415d6SAmir Goldstein int ovl_set_nlink_lower(struct dentry *dentry); 349caf70cb2SAmir Goldstein unsigned int ovl_get_nlink(struct dentry *lowerdentry, 350caf70cb2SAmir Goldstein struct dentry *upperdentry, 351caf70cb2SAmir Goldstein unsigned int fallback); 352e9be9d5eSMiklos Szeredi int ovl_setattr(struct dentry *dentry, struct iattr *attr); 3535b712091SMiklos Szeredi int ovl_getattr(const struct path *path, struct kstat *stat, 3545b712091SMiklos Szeredi u32 request_mask, unsigned int flags); 355e9be9d5eSMiklos Szeredi int ovl_permission(struct inode *inode, int mask); 3561d88f183SMiklos Szeredi int ovl_xattr_set(struct dentry *dentry, struct inode *inode, const char *name, 3571d88f183SMiklos Szeredi const void *value, size_t size, int flags); 3581d88f183SMiklos Szeredi int ovl_xattr_get(struct dentry *dentry, struct inode *inode, const char *name, 3590eb45fc3SAndreas Gruenbacher void *value, size_t size); 360e9be9d5eSMiklos Szeredi ssize_t ovl_listxattr(struct dentry *dentry, char *list, size_t size); 36139a25b2bSVivek Goyal struct posix_acl *ovl_get_acl(struct inode *inode, int type); 36295582b00SDeepa Dinamani int ovl_update_time(struct inode *inode, struct timespec64 *ts, int flags); 3630956254aSMiklos Szeredi bool ovl_is_private_xattr(const char *name); 364e9be9d5eSMiklos Szeredi 365ac6a52ebSVivek Goyal struct ovl_inode_params { 36601b39dccSAmir Goldstein struct inode *newinode; 367ac6a52ebSVivek Goyal struct dentry *upperdentry; 368ac6a52ebSVivek Goyal struct ovl_path *lowerpath; 369ac6a52ebSVivek Goyal struct dentry *index; 370ac6a52ebSVivek Goyal unsigned int numlower; 3719cec54c8SVivek Goyal char *redirect; 3722664bd08SVivek Goyal struct dentry *lowerdata; 373ac6a52ebSVivek Goyal }; 374ca4c8a3aSMiklos Szeredi struct inode *ovl_new_inode(struct super_block *sb, umode_t mode, dev_t rdev); 3754b91c30aSAmir Goldstein struct inode *ovl_lookup_inode(struct super_block *sb, struct dentry *real, 3764b91c30aSAmir Goldstein bool is_upper); 377146d62e5SAmir Goldstein bool ovl_lookup_trap_inode(struct super_block *sb, struct dentry *dir); 378146d62e5SAmir Goldstein struct inode *ovl_get_trap_inode(struct super_block *sb, struct dentry *dir); 379ac6a52ebSVivek Goyal struct inode *ovl_get_inode(struct super_block *sb, 380ac6a52ebSVivek Goyal struct ovl_inode_params *oip); 381e9be9d5eSMiklos Szeredi static inline void ovl_copyattr(struct inode *from, struct inode *to) 382e9be9d5eSMiklos Szeredi { 383e9be9d5eSMiklos Szeredi to->i_uid = from->i_uid; 384e9be9d5eSMiklos Szeredi to->i_gid = from->i_gid; 38507a2daabSVivek Goyal to->i_mode = from->i_mode; 386d719e8f2SMiklos Szeredi to->i_atime = from->i_atime; 387d719e8f2SMiklos Szeredi to->i_mtime = from->i_mtime; 388d719e8f2SMiklos Szeredi to->i_ctime = from->i_ctime; 38946e5d0a3SMiklos Szeredi i_size_write(to, i_size_read(from)); 390e9be9d5eSMiklos Szeredi } 391e9be9d5eSMiklos Szeredi 3924f357295SMiklos Szeredi static inline void ovl_copyflags(struct inode *from, struct inode *to) 3934f357295SMiklos Szeredi { 3944f357295SMiklos Szeredi unsigned int mask = S_SYNC | S_IMMUTABLE | S_APPEND | S_NOATIME; 3954f357295SMiklos Szeredi 3964f357295SMiklos Szeredi inode_set_flags(to, from->i_flags & mask, mask); 3974f357295SMiklos Szeredi } 3984f357295SMiklos Szeredi 399e9be9d5eSMiklos Szeredi /* dir.c */ 400e9be9d5eSMiklos Szeredi extern const struct inode_operations ovl_dir_inode_operations; 401e7dd0e71SAmir Goldstein int ovl_cleanup_and_whiteout(struct dentry *workdir, struct inode *dir, 402e7dd0e71SAmir Goldstein struct dentry *dentry); 403471ec5dcSAmir Goldstein struct ovl_cattr { 40432a3d848SAl Viro dev_t rdev; 40532a3d848SAl Viro umode_t mode; 40632a3d848SAl Viro const char *link; 407471ec5dcSAmir Goldstein struct dentry *hardlink; 40832a3d848SAl Viro }; 409471ec5dcSAmir Goldstein 410471ec5dcSAmir Goldstein #define OVL_CATTR(m) (&(struct ovl_cattr) { .mode = (m) }) 411471ec5dcSAmir Goldstein 41295a1c815SMiklos Szeredi struct dentry *ovl_create_real(struct inode *dir, struct dentry *newdentry, 413471ec5dcSAmir Goldstein struct ovl_cattr *attr); 414415543d5SAmir Goldstein int ovl_cleanup(struct inode *dir, struct dentry *dentry); 415137ec526SAmir Goldstein struct dentry *ovl_create_temp(struct dentry *workdir, struct ovl_cattr *attr); 416e9be9d5eSMiklos Szeredi 417d1d04ef8SMiklos Szeredi /* file.c */ 418d1d04ef8SMiklos Szeredi extern const struct file_operations ovl_file_operations; 419d1d04ef8SMiklos Szeredi 420e9be9d5eSMiklos Szeredi /* copy_up.c */ 421e9be9d5eSMiklos Szeredi int ovl_copy_up(struct dentry *dentry); 422d1e6f6a9SVivek Goyal int ovl_copy_up_with_data(struct dentry *dentry); 4239aba6521SAmir Goldstein int ovl_copy_up_flags(struct dentry *dentry, int flags); 4243428030dSAmir Goldstein int ovl_maybe_copy_up(struct dentry *dentry, int flags); 425e9be9d5eSMiklos Szeredi int ovl_copy_xattr(struct dentry *old, struct dentry *new); 426e9be9d5eSMiklos Szeredi int ovl_set_attr(struct dentry *upper, struct kstat *stat); 4275b2cccd3SAmir Goldstein struct ovl_fh *ovl_encode_real_fh(struct dentry *real, bool is_upper); 4289678e630SAmir Goldstein int ovl_set_origin(struct dentry *dentry, struct dentry *lower, 4299678e630SAmir Goldstein struct dentry *upper); 4308ed5eec9SAmir Goldstein 4318ed5eec9SAmir Goldstein /* export.c */ 4328ed5eec9SAmir Goldstein extern const struct export_operations ovl_export_operations; 433