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 121bd0a3aeSlijiazi #undef pr_fmt 131bd0a3aeSlijiazi #define pr_fmt(fmt) "overlayfs: " fmt 141bd0a3aeSlijiazi 15e9be9d5eSMiklos Szeredi enum ovl_path_type { 1638e813dbSMiklos Szeredi __OVL_PATH_UPPER = (1 << 0), 1738e813dbSMiklos Szeredi __OVL_PATH_MERGE = (1 << 1), 1859548503SAmir Goldstein __OVL_PATH_ORIGIN = (1 << 2), 19e9be9d5eSMiklos Szeredi }; 20e9be9d5eSMiklos Szeredi 211afaba1eSMiklos Szeredi #define OVL_TYPE_UPPER(type) ((type) & __OVL_PATH_UPPER) 221afaba1eSMiklos Szeredi #define OVL_TYPE_MERGE(type) ((type) & __OVL_PATH_MERGE) 2359548503SAmir Goldstein #define OVL_TYPE_ORIGIN(type) ((type) & __OVL_PATH_ORIGIN) 24d837a49bSMiklos Szeredi 25fe2b7595SAndreas Gruenbacher #define OVL_XATTR_PREFIX XATTR_TRUSTED_PREFIX "overlay." 26fe2b7595SAndreas Gruenbacher #define OVL_XATTR_OPAQUE OVL_XATTR_PREFIX "opaque" 2702b69b28SMiklos Szeredi #define OVL_XATTR_REDIRECT OVL_XATTR_PREFIX "redirect" 283a1e819bSAmir Goldstein #define OVL_XATTR_ORIGIN OVL_XATTR_PREFIX "origin" 29ee1d6d37SAmir Goldstein #define OVL_XATTR_IMPURE OVL_XATTR_PREFIX "impure" 305f8415d6SAmir Goldstein #define OVL_XATTR_NLINK OVL_XATTR_PREFIX "nlink" 31ad1d615cSAmir Goldstein #define OVL_XATTR_UPPER OVL_XATTR_PREFIX "upper" 320c288874SVivek Goyal #define OVL_XATTR_METACOPY OVL_XATTR_PREFIX "metacopy" 333a1e819bSAmir Goldstein 34c62520a8SAmir Goldstein enum ovl_inode_flag { 35b79e05aaSAmir Goldstein /* Pure upper dir that may contain non pure upper entries */ 3613c72075SMiklos Szeredi OVL_IMPURE, 37b79e05aaSAmir Goldstein /* Non-merge dir that may contain whiteout entries */ 38b79e05aaSAmir Goldstein OVL_WHITEOUTS, 39359f392cSAmir Goldstein OVL_INDEX, 400c288874SVivek Goyal OVL_UPPERDATA, 41a00c2d59SVivek Goyal /* Inode number will remain constant over copy up. */ 42a00c2d59SVivek Goyal OVL_CONST_INO, 4313c72075SMiklos Szeredi }; 4413c72075SMiklos Szeredi 45c62520a8SAmir Goldstein enum ovl_entry_flag { 46c62520a8SAmir Goldstein OVL_E_UPPER_ALIAS, 47c62520a8SAmir Goldstein OVL_E_OPAQUE, 482ca3c148SAmir Goldstein OVL_E_CONNECTED, 49c62520a8SAmir Goldstein }; 50c62520a8SAmir Goldstein 513a1e819bSAmir Goldstein /* 523a1e819bSAmir Goldstein * The tuple (fh,uuid) is a universal unique identifier for a copy up origin, 533a1e819bSAmir Goldstein * where: 543a1e819bSAmir Goldstein * origin.fh - exported file handle of the lower file 553a1e819bSAmir Goldstein * origin.uuid - uuid of the lower filesystem 563a1e819bSAmir Goldstein */ 573a1e819bSAmir Goldstein #define OVL_FH_VERSION 0 583a1e819bSAmir Goldstein #define OVL_FH_MAGIC 0xfb 593a1e819bSAmir Goldstein 603a1e819bSAmir Goldstein /* CPU byte order required for fid decoding: */ 613a1e819bSAmir Goldstein #define OVL_FH_FLAG_BIG_ENDIAN (1 << 0) 623a1e819bSAmir Goldstein #define OVL_FH_FLAG_ANY_ENDIAN (1 << 1) 6354fb347eSAmir Goldstein /* Is the real inode encoded in fid an upper inode? */ 6454fb347eSAmir Goldstein #define OVL_FH_FLAG_PATH_UPPER (1 << 2) 653a1e819bSAmir Goldstein 66961af647SAmir Goldstein #define OVL_FH_FLAG_ALL (OVL_FH_FLAG_BIG_ENDIAN | OVL_FH_FLAG_ANY_ENDIAN | \ 67961af647SAmir Goldstein OVL_FH_FLAG_PATH_UPPER) 683a1e819bSAmir Goldstein 693a1e819bSAmir Goldstein #if defined(__LITTLE_ENDIAN) 703a1e819bSAmir Goldstein #define OVL_FH_FLAG_CPU_ENDIAN 0 713a1e819bSAmir Goldstein #elif defined(__BIG_ENDIAN) 723a1e819bSAmir Goldstein #define OVL_FH_FLAG_CPU_ENDIAN OVL_FH_FLAG_BIG_ENDIAN 733a1e819bSAmir Goldstein #else 743a1e819bSAmir Goldstein #error Endianness not defined 753a1e819bSAmir Goldstein #endif 763a1e819bSAmir Goldstein 77cbe7fba8SAmir Goldstein /* The type used to be returned by overlay exportfs for misaligned fid */ 78cbe7fba8SAmir Goldstein #define OVL_FILEID_V0 0xfb 79cbe7fba8SAmir Goldstein /* The type returned by overlay exportfs for 32bit aligned fid */ 80cbe7fba8SAmir Goldstein #define OVL_FILEID_V1 0xf8 818ed5eec9SAmir Goldstein 82cbe7fba8SAmir Goldstein /* On-disk format for "origin" file handle */ 83cbe7fba8SAmir Goldstein struct ovl_fb { 843a1e819bSAmir Goldstein u8 version; /* 0 */ 853a1e819bSAmir Goldstein u8 magic; /* 0xfb */ 863a1e819bSAmir Goldstein u8 len; /* size of this header + size of fid */ 873a1e819bSAmir Goldstein u8 flags; /* OVL_FH_FLAG_* */ 883a1e819bSAmir Goldstein u8 type; /* fid_type of fid */ 8901633fd2SChristoph Hellwig uuid_t uuid; /* uuid of filesystem */ 90cbe7fba8SAmir Goldstein u32 fid[0]; /* file identifier should be 32bit aligned in-memory */ 913a1e819bSAmir Goldstein } __packed; 92e9be9d5eSMiklos Szeredi 93cbe7fba8SAmir Goldstein /* In-memory and on-wire format for overlay file handle */ 94cbe7fba8SAmir Goldstein struct ovl_fh { 95cbe7fba8SAmir Goldstein u8 padding[3]; /* make sure fb.fid is 32bit aligned */ 96cbe7fba8SAmir Goldstein union { 97cbe7fba8SAmir Goldstein struct ovl_fb fb; 98cbe7fba8SAmir Goldstein u8 buf[0]; 99cbe7fba8SAmir Goldstein }; 100cbe7fba8SAmir Goldstein } __packed; 101cbe7fba8SAmir Goldstein 102cbe7fba8SAmir Goldstein #define OVL_FH_WIRE_OFFSET offsetof(struct ovl_fh, fb) 103cbe7fba8SAmir Goldstein #define OVL_FH_LEN(fh) (OVL_FH_WIRE_OFFSET + (fh)->fb.len) 104cbe7fba8SAmir Goldstein #define OVL_FH_FID_OFFSET (OVL_FH_WIRE_OFFSET + \ 105cbe7fba8SAmir Goldstein offsetof(struct ovl_fb, fid)) 106cbe7fba8SAmir Goldstein 107e9be9d5eSMiklos Szeredi static inline int ovl_do_rmdir(struct inode *dir, struct dentry *dentry) 108e9be9d5eSMiklos Szeredi { 109e9be9d5eSMiklos Szeredi int err = vfs_rmdir(dir, dentry); 1106cf00764SAmir Goldstein 111e9be9d5eSMiklos Szeredi pr_debug("rmdir(%pd2) = %i\n", dentry, err); 112e9be9d5eSMiklos Szeredi return err; 113e9be9d5eSMiklos Szeredi } 114e9be9d5eSMiklos Szeredi 115e9be9d5eSMiklos Szeredi static inline int ovl_do_unlink(struct inode *dir, struct dentry *dentry) 116e9be9d5eSMiklos Szeredi { 117e9be9d5eSMiklos Szeredi int err = vfs_unlink(dir, dentry, NULL); 1186cf00764SAmir Goldstein 119e9be9d5eSMiklos Szeredi pr_debug("unlink(%pd2) = %i\n", dentry, err); 120e9be9d5eSMiklos Szeredi return err; 121e9be9d5eSMiklos Szeredi } 122e9be9d5eSMiklos Szeredi 123e9be9d5eSMiklos Szeredi static inline int ovl_do_link(struct dentry *old_dentry, struct inode *dir, 1246cf00764SAmir Goldstein struct dentry *new_dentry) 125e9be9d5eSMiklos Szeredi { 126e9be9d5eSMiklos Szeredi int err = vfs_link(old_dentry, dir, new_dentry, NULL); 1276cf00764SAmir Goldstein 1286cf00764SAmir Goldstein pr_debug("link(%pd2, %pd2) = %i\n", old_dentry, new_dentry, err); 129e9be9d5eSMiklos Szeredi return err; 130e9be9d5eSMiklos Szeredi } 131e9be9d5eSMiklos Szeredi 132e9be9d5eSMiklos Szeredi static inline int ovl_do_create(struct inode *dir, struct dentry *dentry, 1336cf00764SAmir Goldstein umode_t mode) 134e9be9d5eSMiklos Szeredi { 135e9be9d5eSMiklos Szeredi int err = vfs_create(dir, dentry, mode, true); 1366cf00764SAmir Goldstein 137e9be9d5eSMiklos Szeredi pr_debug("create(%pd2, 0%o) = %i\n", dentry, mode, err); 138e9be9d5eSMiklos Szeredi return err; 139e9be9d5eSMiklos Szeredi } 140e9be9d5eSMiklos Szeredi 141e9be9d5eSMiklos Szeredi static inline int ovl_do_mkdir(struct inode *dir, struct dentry *dentry, 1426cf00764SAmir Goldstein umode_t mode) 143e9be9d5eSMiklos Szeredi { 144e9be9d5eSMiklos Szeredi int err = vfs_mkdir(dir, dentry, mode); 145e9be9d5eSMiklos Szeredi pr_debug("mkdir(%pd2, 0%o) = %i\n", dentry, mode, err); 146e9be9d5eSMiklos Szeredi return err; 147e9be9d5eSMiklos Szeredi } 148e9be9d5eSMiklos Szeredi 149e9be9d5eSMiklos Szeredi static inline int ovl_do_mknod(struct inode *dir, struct dentry *dentry, 1506cf00764SAmir Goldstein umode_t mode, dev_t dev) 151e9be9d5eSMiklos Szeredi { 152e9be9d5eSMiklos Szeredi int err = vfs_mknod(dir, dentry, mode, dev); 1536cf00764SAmir Goldstein 1546cf00764SAmir Goldstein pr_debug("mknod(%pd2, 0%o, 0%o) = %i\n", dentry, mode, dev, err); 155e9be9d5eSMiklos Szeredi return err; 156e9be9d5eSMiklos Szeredi } 157e9be9d5eSMiklos Szeredi 158e9be9d5eSMiklos Szeredi static inline int ovl_do_symlink(struct inode *dir, struct dentry *dentry, 1596cf00764SAmir Goldstein const char *oldname) 160e9be9d5eSMiklos Szeredi { 161e9be9d5eSMiklos Szeredi int err = vfs_symlink(dir, dentry, oldname); 1626cf00764SAmir Goldstein 163e9be9d5eSMiklos Szeredi pr_debug("symlink(\"%s\", %pd2) = %i\n", oldname, dentry, err); 164e9be9d5eSMiklos Szeredi return err; 165e9be9d5eSMiklos Szeredi } 166e9be9d5eSMiklos Szeredi 167e9be9d5eSMiklos Szeredi static inline int ovl_do_setxattr(struct dentry *dentry, const char *name, 168e9be9d5eSMiklos Szeredi const void *value, size_t size, int flags) 169e9be9d5eSMiklos Szeredi { 170e9be9d5eSMiklos Szeredi int err = vfs_setxattr(dentry, name, value, size, flags); 1711a8f8d2aSMiklos Szeredi pr_debug("setxattr(%pd2, \"%s\", \"%*pE\", %zu, 0x%x) = %i\n", 1721a8f8d2aSMiklos Szeredi dentry, name, min((int)size, 48), value, size, flags, err); 173e9be9d5eSMiklos Szeredi return err; 174e9be9d5eSMiklos Szeredi } 175e9be9d5eSMiklos Szeredi 176e9be9d5eSMiklos Szeredi static inline int ovl_do_removexattr(struct dentry *dentry, const char *name) 177e9be9d5eSMiklos Szeredi { 178e9be9d5eSMiklos Szeredi int err = vfs_removexattr(dentry, name); 179e9be9d5eSMiklos Szeredi pr_debug("removexattr(%pd2, \"%s\") = %i\n", dentry, name, err); 180e9be9d5eSMiklos Szeredi return err; 181e9be9d5eSMiklos Szeredi } 182e9be9d5eSMiklos Szeredi 183e9be9d5eSMiklos Szeredi static inline int ovl_do_rename(struct inode *olddir, struct dentry *olddentry, 184e9be9d5eSMiklos Szeredi struct inode *newdir, struct dentry *newdentry, 185e9be9d5eSMiklos Szeredi unsigned int flags) 186e9be9d5eSMiklos Szeredi { 187e9be9d5eSMiklos Szeredi int err; 188e9be9d5eSMiklos Szeredi 1896cf00764SAmir Goldstein pr_debug("rename(%pd2, %pd2, 0x%x)\n", olddentry, newdentry, flags); 190e9be9d5eSMiklos Szeredi err = vfs_rename(olddir, olddentry, newdir, newdentry, NULL, flags); 191e9be9d5eSMiklos Szeredi if (err) { 1922773bf00SMiklos Szeredi pr_debug("...rename(%pd2, %pd2, ...) = %i\n", 193e9be9d5eSMiklos Szeredi olddentry, newdentry, err); 194e9be9d5eSMiklos Szeredi } 195e9be9d5eSMiklos Szeredi return err; 196e9be9d5eSMiklos Szeredi } 197e9be9d5eSMiklos Szeredi 198e9be9d5eSMiklos Szeredi static inline int ovl_do_whiteout(struct inode *dir, struct dentry *dentry) 199e9be9d5eSMiklos Szeredi { 200e9be9d5eSMiklos Szeredi int err = vfs_whiteout(dir, dentry); 201e9be9d5eSMiklos Szeredi pr_debug("whiteout(%pd2) = %i\n", dentry, err); 202e9be9d5eSMiklos Szeredi return err; 203e9be9d5eSMiklos Szeredi } 204e9be9d5eSMiklos Szeredi 205e7f52429SAmir Goldstein static inline struct dentry *ovl_do_tmpfile(struct dentry *dentry, umode_t mode) 206e7f52429SAmir Goldstein { 207e7f52429SAmir Goldstein struct dentry *ret = vfs_tmpfile(dentry, mode, 0); 2087879cb43SVasyl Gomonovych int err = PTR_ERR_OR_ZERO(ret); 209e7f52429SAmir Goldstein 210e7f52429SAmir Goldstein pr_debug("tmpfile(%pd2, 0%o) = %i\n", dentry, mode, err); 211e7f52429SAmir Goldstein return ret; 212e7f52429SAmir Goldstein } 213e7f52429SAmir Goldstein 2140c288874SVivek Goyal static inline bool ovl_open_flags_need_copy_up(int flags) 2150c288874SVivek Goyal { 2160c288874SVivek Goyal if (!flags) 2170c288874SVivek Goyal return false; 2180c288874SVivek Goyal 2190c288874SVivek Goyal return ((OPEN_FMODE(flags) & FMODE_WRITE) || (flags & O_TRUNC)); 2200c288874SVivek Goyal } 2210c288874SVivek Goyal 222bbb1e54dSMiklos Szeredi /* util.c */ 223bbb1e54dSMiklos Szeredi int ovl_want_write(struct dentry *dentry); 224bbb1e54dSMiklos Szeredi void ovl_drop_write(struct dentry *dentry); 225bbb1e54dSMiklos Szeredi struct dentry *ovl_workdir(struct dentry *dentry); 226bbb1e54dSMiklos Szeredi const struct cred *ovl_override_creds(struct super_block *sb); 2277bcd74b9SAmir Goldstein struct super_block *ovl_same_sb(struct super_block *sb); 228e487d889SAmir Goldstein int ovl_can_decode_fh(struct super_block *sb); 22902bcd157SAmir Goldstein struct dentry *ovl_indexdir(struct super_block *sb); 230f168f109SAmir Goldstein bool ovl_index_all(struct super_block *sb); 231f168f109SAmir Goldstein bool ovl_verify_lower(struct super_block *sb); 232bbb1e54dSMiklos Szeredi struct ovl_entry *ovl_alloc_entry(unsigned int numlower); 233bbb1e54dSMiklos Szeredi bool ovl_dentry_remote(struct dentry *dentry); 234bbb1e54dSMiklos Szeredi bool ovl_dentry_weird(struct dentry *dentry); 235e9be9d5eSMiklos Szeredi enum ovl_path_type ovl_path_type(struct dentry *dentry); 236e9be9d5eSMiklos Szeredi void ovl_path_upper(struct dentry *dentry, struct path *path); 237e9be9d5eSMiklos Szeredi void ovl_path_lower(struct dentry *dentry, struct path *path); 2384f93b426SVivek Goyal void ovl_path_lowerdata(struct dentry *dentry, struct path *path); 239e9be9d5eSMiklos Szeredi enum ovl_path_type ovl_path_real(struct dentry *dentry, struct path *path); 240e9be9d5eSMiklos Szeredi struct dentry *ovl_dentry_upper(struct dentry *dentry); 241e9be9d5eSMiklos Szeredi struct dentry *ovl_dentry_lower(struct dentry *dentry); 242647d253fSVivek Goyal struct dentry *ovl_dentry_lowerdata(struct dentry *dentry); 243da309e8cSAmir Goldstein struct ovl_layer *ovl_layer_lower(struct dentry *dentry); 244e9be9d5eSMiklos Szeredi struct dentry *ovl_dentry_real(struct dentry *dentry); 2451d88f183SMiklos Szeredi struct dentry *ovl_i_dentry_upper(struct inode *inode); 24609d8b586SMiklos Szeredi struct inode *ovl_inode_upper(struct inode *inode); 24709d8b586SMiklos Szeredi struct inode *ovl_inode_lower(struct inode *inode); 2482664bd08SVivek Goyal struct inode *ovl_inode_lowerdata(struct inode *inode); 24909d8b586SMiklos Szeredi struct inode *ovl_inode_real(struct inode *inode); 2504823d49cSVivek Goyal struct inode *ovl_inode_realdata(struct inode *inode); 2514edb83bbSMiklos Szeredi struct ovl_dir_cache *ovl_dir_cache(struct inode *inode); 2524edb83bbSMiklos Szeredi void ovl_set_dir_cache(struct inode *inode, struct ovl_dir_cache *cache); 253c62520a8SAmir Goldstein void ovl_dentry_set_flag(unsigned long flag, struct dentry *dentry); 254c62520a8SAmir Goldstein void ovl_dentry_clear_flag(unsigned long flag, struct dentry *dentry); 255c62520a8SAmir Goldstein bool ovl_dentry_test_flag(unsigned long flag, struct dentry *dentry); 256e9be9d5eSMiklos Szeredi bool ovl_dentry_is_opaque(struct dentry *dentry); 257c412ce49SMiklos Szeredi bool ovl_dentry_is_whiteout(struct dentry *dentry); 2585cf5b477SMiklos Szeredi void ovl_dentry_set_opaque(struct dentry *dentry); 25955acc661SMiklos Szeredi bool ovl_dentry_has_upper_alias(struct dentry *dentry); 26055acc661SMiklos Szeredi void ovl_dentry_set_upper_alias(struct dentry *dentry); 2610c288874SVivek Goyal bool ovl_dentry_needs_data_copy_up(struct dentry *dentry, int flags); 2620c288874SVivek Goyal bool ovl_dentry_needs_data_copy_up_locked(struct dentry *dentry, int flags); 2630c288874SVivek Goyal bool ovl_has_upperdata(struct inode *inode); 2640c288874SVivek Goyal void ovl_set_upperdata(struct inode *inode); 265a6c60655SMiklos Szeredi bool ovl_redirect_dir(struct super_block *sb); 266a6c60655SMiklos Szeredi const char *ovl_dentry_get_redirect(struct dentry *dentry); 267a6c60655SMiklos Szeredi void ovl_dentry_set_redirect(struct dentry *dentry, const char *redirect); 26809d8b586SMiklos Szeredi void ovl_inode_init(struct inode *inode, struct dentry *upperdentry, 2692664bd08SVivek Goyal struct dentry *lowerdentry, struct dentry *lowerdata); 27009d8b586SMiklos Szeredi void ovl_inode_update(struct inode *inode, struct dentry *upperdentry); 271d9854c87SMiklos Szeredi void ovl_dir_modified(struct dentry *dentry, bool impurity); 272bbb1e54dSMiklos Szeredi u64 ovl_dentry_version_get(struct dentry *dentry); 273bbb1e54dSMiklos Szeredi bool ovl_is_whiteout(struct dentry *dentry); 274e9be9d5eSMiklos Szeredi struct file *ovl_path_open(struct path *path, int flags); 2750c288874SVivek Goyal int ovl_copy_up_start(struct dentry *dentry, int flags); 27639d3d60aSAmir Goldstein void ovl_copy_up_end(struct dentry *dentry); 2770c288874SVivek Goyal bool ovl_already_copied_up(struct dentry *dentry, int flags); 278b79e05aaSAmir Goldstein bool ovl_check_origin_xattr(struct dentry *dentry); 279f3a15685SAmir Goldstein bool ovl_check_dir_xattr(struct dentry *dentry, const char *name); 280f3a15685SAmir Goldstein int ovl_check_setxattr(struct dentry *dentry, struct dentry *upperdentry, 281f3a15685SAmir Goldstein const char *name, const void *value, size_t size, 282f3a15685SAmir Goldstein int xerr); 283f3a15685SAmir Goldstein int ovl_set_impure(struct dentry *dentry, struct dentry *upperdentry); 28413c72075SMiklos Szeredi void ovl_set_flag(unsigned long flag, struct inode *inode); 2854edb83bbSMiklos Szeredi void ovl_clear_flag(unsigned long flag, struct inode *inode); 28613c72075SMiklos Szeredi bool ovl_test_flag(unsigned long flag, struct inode *inode); 287ad0af710SAmir Goldstein bool ovl_inuse_trylock(struct dentry *dentry); 288ad0af710SAmir Goldstein void ovl_inuse_unlock(struct dentry *dentry); 289146d62e5SAmir Goldstein bool ovl_is_inuse(struct dentry *dentry); 29024b33ee1SAmir Goldstein bool ovl_need_index(struct dentry *dentry); 2910e32992fSAmir Goldstein int ovl_nlink_start(struct dentry *dentry); 2920e32992fSAmir Goldstein void ovl_nlink_end(struct dentry *dentry); 2935820dc08SAmir Goldstein int ovl_lock_rename_workdir(struct dentry *workdir, struct dentry *upperdir); 2949d3dfea3SVivek Goyal int ovl_check_metacopy_xattr(struct dentry *dentry); 29567d756c2SVivek Goyal bool ovl_is_metacopy_dentry(struct dentry *dentry); 2960a2d0d3fSVivek Goyal char *ovl_get_redirect_xattr(struct dentry *dentry, int padding); 297993a0b2aSVivek Goyal ssize_t ovl_getxattr(struct dentry *dentry, char *name, char **value, 298993a0b2aSVivek Goyal size_t padding); 299f3a15685SAmir Goldstein 300f3a15685SAmir Goldstein static inline bool ovl_is_impuredir(struct dentry *dentry) 301f3a15685SAmir Goldstein { 302f3a15685SAmir Goldstein return ovl_check_dir_xattr(dentry, OVL_XATTR_IMPURE); 303f3a15685SAmir Goldstein } 304f3a15685SAmir Goldstein 305e487d889SAmir Goldstein static inline unsigned int ovl_xino_bits(struct super_block *sb) 306e487d889SAmir Goldstein { 307e487d889SAmir Goldstein struct ovl_fs *ofs = sb->s_fs_info; 308e487d889SAmir Goldstein 309e487d889SAmir Goldstein return ofs->xino_bits; 310e487d889SAmir Goldstein } 311e487d889SAmir Goldstein 3121e92e307SAmir Goldstein static inline int ovl_inode_lock(struct inode *inode) 3131e92e307SAmir Goldstein { 3141e92e307SAmir Goldstein return mutex_lock_interruptible(&OVL_I(inode)->lock); 3151e92e307SAmir Goldstein } 3161e92e307SAmir Goldstein 3171e92e307SAmir Goldstein static inline void ovl_inode_unlock(struct inode *inode) 3181e92e307SAmir Goldstein { 3191e92e307SAmir Goldstein mutex_unlock(&OVL_I(inode)->lock); 3201e92e307SAmir Goldstein } 3211e92e307SAmir Goldstein 322e9be9d5eSMiklos Szeredi 323bbb1e54dSMiklos Szeredi /* namei.c */ 324cbe7fba8SAmir Goldstein int ovl_check_fb_len(struct ovl_fb *fb, int fb_len); 325cbe7fba8SAmir Goldstein 326cbe7fba8SAmir Goldstein static inline int ovl_check_fh_len(struct ovl_fh *fh, int fh_len) 327cbe7fba8SAmir Goldstein { 328cbe7fba8SAmir Goldstein return ovl_check_fb_len(&fh->fb, fh_len - OVL_FH_WIRE_OFFSET); 329cbe7fba8SAmir Goldstein } 330cbe7fba8SAmir Goldstein 3318a22efa1SAmir Goldstein struct dentry *ovl_decode_real_fh(struct ovl_fh *fh, struct vfsmount *mnt, 3328a22efa1SAmir Goldstein bool connected); 3338a22efa1SAmir Goldstein int ovl_check_origin_fh(struct ovl_fs *ofs, struct ovl_fh *fh, bool connected, 334f941866fSAmir Goldstein struct dentry *upperdentry, struct ovl_path **stackp); 33505122443SAmir Goldstein int ovl_verify_set_fh(struct dentry *dentry, const char *name, 33605122443SAmir Goldstein struct dentry *real, bool is_upper, bool set); 3373b0bfc6eSAmir Goldstein struct dentry *ovl_index_upper(struct ovl_fs *ofs, struct dentry *index); 3381eff1a1dSAmir Goldstein int ovl_verify_index(struct ovl_fs *ofs, struct dentry *index); 339359f392cSAmir Goldstein int ovl_get_index_name(struct dentry *origin, struct qstr *name); 34091ffe7beSAmir Goldstein struct dentry *ovl_get_index_fh(struct ovl_fs *ofs, struct ovl_fh *fh); 34106170154SAmir Goldstein struct dentry *ovl_lookup_index(struct ovl_fs *ofs, struct dentry *upper, 34206170154SAmir Goldstein struct dentry *origin, bool verify); 343bbb1e54dSMiklos Szeredi int ovl_path_next(int idx, struct dentry *dentry, struct path *path); 3441eff1a1dSAmir Goldstein struct dentry *ovl_lookup(struct inode *dir, struct dentry *dentry, 3451eff1a1dSAmir Goldstein unsigned int flags); 346bbb1e54dSMiklos Szeredi bool ovl_lower_positive(struct dentry *dentry); 347e9be9d5eSMiklos Szeredi 34805122443SAmir Goldstein static inline int ovl_verify_origin(struct dentry *upper, 34905122443SAmir Goldstein struct dentry *origin, bool set) 35005122443SAmir Goldstein { 35105122443SAmir Goldstein return ovl_verify_set_fh(upper, OVL_XATTR_ORIGIN, origin, false, set); 35205122443SAmir Goldstein } 35305122443SAmir Goldstein 354ad1d615cSAmir Goldstein static inline int ovl_verify_upper(struct dentry *index, 355ad1d615cSAmir Goldstein struct dentry *upper, bool set) 356ad1d615cSAmir Goldstein { 357ad1d615cSAmir Goldstein return ovl_verify_set_fh(index, OVL_XATTR_UPPER, upper, true, set); 358ad1d615cSAmir Goldstein } 359ad1d615cSAmir Goldstein 360e9be9d5eSMiklos Szeredi /* readdir.c */ 361e9be9d5eSMiklos Szeredi extern const struct file_operations ovl_dir_operations; 362e9be9d5eSMiklos Szeredi int ovl_check_empty_dir(struct dentry *dentry, struct list_head *list); 363e9be9d5eSMiklos Szeredi void ovl_cleanup_whiteouts(struct dentry *upper, struct list_head *list); 364e9be9d5eSMiklos Szeredi void ovl_cache_free(struct list_head *list); 3654edb83bbSMiklos Szeredi void ovl_dir_cache_free(struct inode *inode); 36645aebeafSVivek Goyal int ovl_check_d_type_supported(struct path *realpath); 367eea2fb48SMiklos Szeredi void ovl_workdir_cleanup(struct inode *dir, struct vfsmount *mnt, 368eea2fb48SMiklos Szeredi struct dentry *dentry, int level); 3691eff1a1dSAmir Goldstein int ovl_indexdir_cleanup(struct ovl_fs *ofs); 370e9be9d5eSMiklos Szeredi 371e9be9d5eSMiklos Szeredi /* inode.c */ 3725f8415d6SAmir Goldstein int ovl_set_nlink_upper(struct dentry *dentry); 3735f8415d6SAmir Goldstein int ovl_set_nlink_lower(struct dentry *dentry); 374caf70cb2SAmir Goldstein unsigned int ovl_get_nlink(struct dentry *lowerdentry, 375caf70cb2SAmir Goldstein struct dentry *upperdentry, 376caf70cb2SAmir Goldstein unsigned int fallback); 377e9be9d5eSMiklos Szeredi int ovl_setattr(struct dentry *dentry, struct iattr *attr); 3785b712091SMiklos Szeredi int ovl_getattr(const struct path *path, struct kstat *stat, 3795b712091SMiklos Szeredi u32 request_mask, unsigned int flags); 380e9be9d5eSMiklos Szeredi int ovl_permission(struct inode *inode, int mask); 3811d88f183SMiklos Szeredi int ovl_xattr_set(struct dentry *dentry, struct inode *inode, const char *name, 3821d88f183SMiklos Szeredi const void *value, size_t size, int flags); 3831d88f183SMiklos Szeredi int ovl_xattr_get(struct dentry *dentry, struct inode *inode, const char *name, 3840eb45fc3SAndreas Gruenbacher void *value, size_t size); 385e9be9d5eSMiklos Szeredi ssize_t ovl_listxattr(struct dentry *dentry, char *list, size_t size); 38639a25b2bSVivek Goyal struct posix_acl *ovl_get_acl(struct inode *inode, int type); 38795582b00SDeepa Dinamani int ovl_update_time(struct inode *inode, struct timespec64 *ts, int flags); 3880956254aSMiklos Szeredi bool ovl_is_private_xattr(const char *name); 389e9be9d5eSMiklos Szeredi 390ac6a52ebSVivek Goyal struct ovl_inode_params { 39101b39dccSAmir Goldstein struct inode *newinode; 392ac6a52ebSVivek Goyal struct dentry *upperdentry; 393ac6a52ebSVivek Goyal struct ovl_path *lowerpath; 394ac6a52ebSVivek Goyal struct dentry *index; 395ac6a52ebSVivek Goyal unsigned int numlower; 3969cec54c8SVivek Goyal char *redirect; 3972664bd08SVivek Goyal struct dentry *lowerdata; 398ac6a52ebSVivek Goyal }; 399ca4c8a3aSMiklos Szeredi struct inode *ovl_new_inode(struct super_block *sb, umode_t mode, dev_t rdev); 4004b91c30aSAmir Goldstein struct inode *ovl_lookup_inode(struct super_block *sb, struct dentry *real, 4014b91c30aSAmir Goldstein bool is_upper); 402146d62e5SAmir Goldstein bool ovl_lookup_trap_inode(struct super_block *sb, struct dentry *dir); 403146d62e5SAmir Goldstein struct inode *ovl_get_trap_inode(struct super_block *sb, struct dentry *dir); 404ac6a52ebSVivek Goyal struct inode *ovl_get_inode(struct super_block *sb, 405ac6a52ebSVivek Goyal struct ovl_inode_params *oip); 406e9be9d5eSMiklos Szeredi static inline void ovl_copyattr(struct inode *from, struct inode *to) 407e9be9d5eSMiklos Szeredi { 408e9be9d5eSMiklos Szeredi to->i_uid = from->i_uid; 409e9be9d5eSMiklos Szeredi to->i_gid = from->i_gid; 41007a2daabSVivek Goyal to->i_mode = from->i_mode; 411d719e8f2SMiklos Szeredi to->i_atime = from->i_atime; 412d719e8f2SMiklos Szeredi to->i_mtime = from->i_mtime; 413d719e8f2SMiklos Szeredi to->i_ctime = from->i_ctime; 41446e5d0a3SMiklos Szeredi i_size_write(to, i_size_read(from)); 415e9be9d5eSMiklos Szeredi } 416e9be9d5eSMiklos Szeredi 4174f357295SMiklos Szeredi static inline void ovl_copyflags(struct inode *from, struct inode *to) 4184f357295SMiklos Szeredi { 4194f357295SMiklos Szeredi unsigned int mask = S_SYNC | S_IMMUTABLE | S_APPEND | S_NOATIME; 4204f357295SMiklos Szeredi 4214f357295SMiklos Szeredi inode_set_flags(to, from->i_flags & mask, mask); 4224f357295SMiklos Szeredi } 4234f357295SMiklos Szeredi 424e9be9d5eSMiklos Szeredi /* dir.c */ 425e9be9d5eSMiklos Szeredi extern const struct inode_operations ovl_dir_inode_operations; 426e7dd0e71SAmir Goldstein int ovl_cleanup_and_whiteout(struct dentry *workdir, struct inode *dir, 427e7dd0e71SAmir Goldstein struct dentry *dentry); 428471ec5dcSAmir Goldstein struct ovl_cattr { 42932a3d848SAl Viro dev_t rdev; 43032a3d848SAl Viro umode_t mode; 43132a3d848SAl Viro const char *link; 432471ec5dcSAmir Goldstein struct dentry *hardlink; 43332a3d848SAl Viro }; 434471ec5dcSAmir Goldstein 435471ec5dcSAmir Goldstein #define OVL_CATTR(m) (&(struct ovl_cattr) { .mode = (m) }) 436471ec5dcSAmir Goldstein 43795a1c815SMiklos Szeredi struct dentry *ovl_create_real(struct inode *dir, struct dentry *newdentry, 438471ec5dcSAmir Goldstein struct ovl_cattr *attr); 439415543d5SAmir Goldstein int ovl_cleanup(struct inode *dir, struct dentry *dentry); 440137ec526SAmir Goldstein struct dentry *ovl_create_temp(struct dentry *workdir, struct ovl_cattr *attr); 441e9be9d5eSMiklos Szeredi 442d1d04ef8SMiklos Szeredi /* file.c */ 443d1d04ef8SMiklos Szeredi extern const struct file_operations ovl_file_operations; 444d1d04ef8SMiklos Szeredi 445e9be9d5eSMiklos Szeredi /* copy_up.c */ 446e9be9d5eSMiklos Szeredi int ovl_copy_up(struct dentry *dentry); 447d1e6f6a9SVivek Goyal int ovl_copy_up_with_data(struct dentry *dentry); 4489aba6521SAmir Goldstein int ovl_copy_up_flags(struct dentry *dentry, int flags); 4493428030dSAmir Goldstein int ovl_maybe_copy_up(struct dentry *dentry, int flags); 450e9be9d5eSMiklos Szeredi int ovl_copy_xattr(struct dentry *old, struct dentry *new); 451e9be9d5eSMiklos Szeredi int ovl_set_attr(struct dentry *upper, struct kstat *stat); 4525b2cccd3SAmir Goldstein struct ovl_fh *ovl_encode_real_fh(struct dentry *real, bool is_upper); 4539678e630SAmir Goldstein int ovl_set_origin(struct dentry *dentry, struct dentry *lower, 4549678e630SAmir Goldstein struct dentry *upper); 4558ed5eec9SAmir Goldstein 4568ed5eec9SAmir Goldstein /* export.c */ 4578ed5eec9SAmir Goldstein extern const struct export_operations ovl_export_operations; 458