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); 227e487d889SAmir Goldstein int ovl_can_decode_fh(struct super_block *sb); 22802bcd157SAmir Goldstein struct dentry *ovl_indexdir(struct super_block *sb); 229f168f109SAmir Goldstein bool ovl_index_all(struct super_block *sb); 230f168f109SAmir Goldstein bool ovl_verify_lower(struct super_block *sb); 231bbb1e54dSMiklos Szeredi struct ovl_entry *ovl_alloc_entry(unsigned int numlower); 232bbb1e54dSMiklos Szeredi bool ovl_dentry_remote(struct dentry *dentry); 233f4288844SMiklos Szeredi void ovl_dentry_update_reval(struct dentry *dentry, struct dentry *upperdentry, 234f4288844SMiklos Szeredi unsigned int mask); 235bbb1e54dSMiklos Szeredi bool ovl_dentry_weird(struct dentry *dentry); 236e9be9d5eSMiklos Szeredi enum ovl_path_type ovl_path_type(struct dentry *dentry); 237e9be9d5eSMiklos Szeredi void ovl_path_upper(struct dentry *dentry, struct path *path); 238e9be9d5eSMiklos Szeredi void ovl_path_lower(struct dentry *dentry, struct path *path); 2394f93b426SVivek Goyal void ovl_path_lowerdata(struct dentry *dentry, struct path *path); 240e9be9d5eSMiklos Szeredi enum ovl_path_type ovl_path_real(struct dentry *dentry, struct path *path); 241e9be9d5eSMiklos Szeredi struct dentry *ovl_dentry_upper(struct dentry *dentry); 242e9be9d5eSMiklos Szeredi struct dentry *ovl_dentry_lower(struct dentry *dentry); 243647d253fSVivek Goyal struct dentry *ovl_dentry_lowerdata(struct dentry *dentry); 24413464165SMiklos Szeredi const struct ovl_layer *ovl_layer_lower(struct dentry *dentry); 245e9be9d5eSMiklos Szeredi struct dentry *ovl_dentry_real(struct dentry *dentry); 2461d88f183SMiklos Szeredi struct dentry *ovl_i_dentry_upper(struct inode *inode); 24709d8b586SMiklos Szeredi struct inode *ovl_inode_upper(struct inode *inode); 24809d8b586SMiklos Szeredi struct inode *ovl_inode_lower(struct inode *inode); 2492664bd08SVivek Goyal struct inode *ovl_inode_lowerdata(struct inode *inode); 25009d8b586SMiklos Szeredi struct inode *ovl_inode_real(struct inode *inode); 2514823d49cSVivek Goyal struct inode *ovl_inode_realdata(struct inode *inode); 2524edb83bbSMiklos Szeredi struct ovl_dir_cache *ovl_dir_cache(struct inode *inode); 2534edb83bbSMiklos Szeredi void ovl_set_dir_cache(struct inode *inode, struct ovl_dir_cache *cache); 254c62520a8SAmir Goldstein void ovl_dentry_set_flag(unsigned long flag, struct dentry *dentry); 255c62520a8SAmir Goldstein void ovl_dentry_clear_flag(unsigned long flag, struct dentry *dentry); 256c62520a8SAmir Goldstein bool ovl_dentry_test_flag(unsigned long flag, struct dentry *dentry); 257e9be9d5eSMiklos Szeredi bool ovl_dentry_is_opaque(struct dentry *dentry); 258c412ce49SMiklos Szeredi bool ovl_dentry_is_whiteout(struct dentry *dentry); 2595cf5b477SMiklos Szeredi void ovl_dentry_set_opaque(struct dentry *dentry); 26055acc661SMiklos Szeredi bool ovl_dentry_has_upper_alias(struct dentry *dentry); 26155acc661SMiklos Szeredi void ovl_dentry_set_upper_alias(struct dentry *dentry); 2620c288874SVivek Goyal bool ovl_dentry_needs_data_copy_up(struct dentry *dentry, int flags); 2630c288874SVivek Goyal bool ovl_dentry_needs_data_copy_up_locked(struct dentry *dentry, int flags); 2640c288874SVivek Goyal bool ovl_has_upperdata(struct inode *inode); 2650c288874SVivek Goyal void ovl_set_upperdata(struct inode *inode); 266a6c60655SMiklos Szeredi bool ovl_redirect_dir(struct super_block *sb); 267a6c60655SMiklos Szeredi const char *ovl_dentry_get_redirect(struct dentry *dentry); 268a6c60655SMiklos Szeredi void ovl_dentry_set_redirect(struct dentry *dentry, const char *redirect); 26909d8b586SMiklos Szeredi void ovl_inode_update(struct inode *inode, struct dentry *upperdentry); 270d9854c87SMiklos Szeredi void ovl_dir_modified(struct dentry *dentry, bool impurity); 271bbb1e54dSMiklos Szeredi u64 ovl_dentry_version_get(struct dentry *dentry); 272bbb1e54dSMiklos Szeredi bool ovl_is_whiteout(struct dentry *dentry); 273e9be9d5eSMiklos Szeredi struct file *ovl_path_open(struct path *path, int flags); 2740c288874SVivek Goyal int ovl_copy_up_start(struct dentry *dentry, int flags); 27539d3d60aSAmir Goldstein void ovl_copy_up_end(struct dentry *dentry); 2760c288874SVivek Goyal bool ovl_already_copied_up(struct dentry *dentry, int flags); 277b79e05aaSAmir Goldstein bool ovl_check_origin_xattr(struct dentry *dentry); 278f3a15685SAmir Goldstein bool ovl_check_dir_xattr(struct dentry *dentry, const char *name); 279f3a15685SAmir Goldstein int ovl_check_setxattr(struct dentry *dentry, struct dentry *upperdentry, 280f3a15685SAmir Goldstein const char *name, const void *value, size_t size, 281f3a15685SAmir Goldstein int xerr); 282f3a15685SAmir Goldstein int ovl_set_impure(struct dentry *dentry, struct dentry *upperdentry); 28313c72075SMiklos Szeredi void ovl_set_flag(unsigned long flag, struct inode *inode); 2844edb83bbSMiklos Szeredi void ovl_clear_flag(unsigned long flag, struct inode *inode); 28513c72075SMiklos Szeredi bool ovl_test_flag(unsigned long flag, struct inode *inode); 286ad0af710SAmir Goldstein bool ovl_inuse_trylock(struct dentry *dentry); 287ad0af710SAmir Goldstein void ovl_inuse_unlock(struct dentry *dentry); 288146d62e5SAmir Goldstein bool ovl_is_inuse(struct dentry *dentry); 28924b33ee1SAmir Goldstein bool ovl_need_index(struct dentry *dentry); 2900e32992fSAmir Goldstein int ovl_nlink_start(struct dentry *dentry); 2910e32992fSAmir Goldstein void ovl_nlink_end(struct dentry *dentry); 2925820dc08SAmir Goldstein int ovl_lock_rename_workdir(struct dentry *workdir, struct dentry *upperdir); 2939d3dfea3SVivek Goyal int ovl_check_metacopy_xattr(struct dentry *dentry); 29467d756c2SVivek Goyal bool ovl_is_metacopy_dentry(struct dentry *dentry); 2950a2d0d3fSVivek Goyal char *ovl_get_redirect_xattr(struct dentry *dentry, int padding); 296993a0b2aSVivek Goyal ssize_t ovl_getxattr(struct dentry *dentry, char *name, char **value, 297993a0b2aSVivek Goyal size_t padding); 298f3a15685SAmir Goldstein 299f3a15685SAmir Goldstein static inline bool ovl_is_impuredir(struct dentry *dentry) 300f3a15685SAmir Goldstein { 301f3a15685SAmir Goldstein return ovl_check_dir_xattr(dentry, OVL_XATTR_IMPURE); 302f3a15685SAmir Goldstein } 303f3a15685SAmir Goldstein 3040f831ec8SAmir Goldstein /* All layers on same fs? */ 3050f831ec8SAmir Goldstein static inline bool ovl_same_fs(struct super_block *sb) 3060f831ec8SAmir Goldstein { 3070f831ec8SAmir Goldstein return OVL_FS(sb)->xino_mode == 0; 3080f831ec8SAmir Goldstein } 3090f831ec8SAmir Goldstein 3100f831ec8SAmir Goldstein /* All overlay inodes have same st_dev? */ 3110f831ec8SAmir Goldstein static inline bool ovl_same_dev(struct super_block *sb) 3120f831ec8SAmir Goldstein { 3130f831ec8SAmir Goldstein return OVL_FS(sb)->xino_mode >= 0; 3140f831ec8SAmir Goldstein } 3150f831ec8SAmir Goldstein 316e487d889SAmir Goldstein static inline unsigned int ovl_xino_bits(struct super_block *sb) 317e487d889SAmir Goldstein { 3180f831ec8SAmir Goldstein return ovl_same_dev(sb) ? OVL_FS(sb)->xino_mode : 0; 319e487d889SAmir Goldstein } 320e487d889SAmir Goldstein 321531d3040SAmir Goldstein static inline void ovl_inode_lock(struct inode *inode) 322531d3040SAmir Goldstein { 323531d3040SAmir Goldstein mutex_lock(&OVL_I(inode)->lock); 324531d3040SAmir Goldstein } 325531d3040SAmir Goldstein 326531d3040SAmir Goldstein static inline int ovl_inode_lock_interruptible(struct inode *inode) 3271e92e307SAmir Goldstein { 3281e92e307SAmir Goldstein return mutex_lock_interruptible(&OVL_I(inode)->lock); 3291e92e307SAmir Goldstein } 3301e92e307SAmir Goldstein 3311e92e307SAmir Goldstein static inline void ovl_inode_unlock(struct inode *inode) 3321e92e307SAmir Goldstein { 3331e92e307SAmir Goldstein mutex_unlock(&OVL_I(inode)->lock); 3341e92e307SAmir Goldstein } 3351e92e307SAmir Goldstein 336e9be9d5eSMiklos Szeredi 337bbb1e54dSMiklos Szeredi /* namei.c */ 338cbe7fba8SAmir Goldstein int ovl_check_fb_len(struct ovl_fb *fb, int fb_len); 339cbe7fba8SAmir Goldstein 340cbe7fba8SAmir Goldstein static inline int ovl_check_fh_len(struct ovl_fh *fh, int fh_len) 341cbe7fba8SAmir Goldstein { 342cbe7fba8SAmir Goldstein return ovl_check_fb_len(&fh->fb, fh_len - OVL_FH_WIRE_OFFSET); 343cbe7fba8SAmir Goldstein } 344cbe7fba8SAmir Goldstein 3458a22efa1SAmir Goldstein struct dentry *ovl_decode_real_fh(struct ovl_fh *fh, struct vfsmount *mnt, 3468a22efa1SAmir Goldstein bool connected); 3478a22efa1SAmir Goldstein int ovl_check_origin_fh(struct ovl_fs *ofs, struct ovl_fh *fh, bool connected, 348f941866fSAmir Goldstein struct dentry *upperdentry, struct ovl_path **stackp); 34905122443SAmir Goldstein int ovl_verify_set_fh(struct dentry *dentry, const char *name, 35005122443SAmir Goldstein struct dentry *real, bool is_upper, bool set); 3513b0bfc6eSAmir Goldstein struct dentry *ovl_index_upper(struct ovl_fs *ofs, struct dentry *index); 3521eff1a1dSAmir Goldstein int ovl_verify_index(struct ovl_fs *ofs, struct dentry *index); 353359f392cSAmir Goldstein int ovl_get_index_name(struct dentry *origin, struct qstr *name); 35491ffe7beSAmir Goldstein struct dentry *ovl_get_index_fh(struct ovl_fs *ofs, struct ovl_fh *fh); 35506170154SAmir Goldstein struct dentry *ovl_lookup_index(struct ovl_fs *ofs, struct dentry *upper, 35606170154SAmir Goldstein struct dentry *origin, bool verify); 357bbb1e54dSMiklos Szeredi int ovl_path_next(int idx, struct dentry *dentry, struct path *path); 3581eff1a1dSAmir Goldstein struct dentry *ovl_lookup(struct inode *dir, struct dentry *dentry, 3591eff1a1dSAmir Goldstein unsigned int flags); 360bbb1e54dSMiklos Szeredi bool ovl_lower_positive(struct dentry *dentry); 361e9be9d5eSMiklos Szeredi 36205122443SAmir Goldstein static inline int ovl_verify_origin(struct dentry *upper, 36305122443SAmir Goldstein struct dentry *origin, bool set) 36405122443SAmir Goldstein { 36505122443SAmir Goldstein return ovl_verify_set_fh(upper, OVL_XATTR_ORIGIN, origin, false, set); 36605122443SAmir Goldstein } 36705122443SAmir Goldstein 368ad1d615cSAmir Goldstein static inline int ovl_verify_upper(struct dentry *index, 369ad1d615cSAmir Goldstein struct dentry *upper, bool set) 370ad1d615cSAmir Goldstein { 371ad1d615cSAmir Goldstein return ovl_verify_set_fh(index, OVL_XATTR_UPPER, upper, true, set); 372ad1d615cSAmir Goldstein } 373ad1d615cSAmir Goldstein 374e9be9d5eSMiklos Szeredi /* readdir.c */ 375e9be9d5eSMiklos Szeredi extern const struct file_operations ovl_dir_operations; 376e9be9d5eSMiklos Szeredi int ovl_check_empty_dir(struct dentry *dentry, struct list_head *list); 377e9be9d5eSMiklos Szeredi void ovl_cleanup_whiteouts(struct dentry *upper, struct list_head *list); 378e9be9d5eSMiklos Szeredi void ovl_cache_free(struct list_head *list); 3794edb83bbSMiklos Szeredi void ovl_dir_cache_free(struct inode *inode); 38045aebeafSVivek Goyal int ovl_check_d_type_supported(struct path *realpath); 381eea2fb48SMiklos Szeredi void ovl_workdir_cleanup(struct inode *dir, struct vfsmount *mnt, 382eea2fb48SMiklos Szeredi struct dentry *dentry, int level); 3831eff1a1dSAmir Goldstein int ovl_indexdir_cleanup(struct ovl_fs *ofs); 384e9be9d5eSMiklos Szeredi 385e9be9d5eSMiklos Szeredi /* inode.c */ 3865f8415d6SAmir Goldstein int ovl_set_nlink_upper(struct dentry *dentry); 3875f8415d6SAmir Goldstein int ovl_set_nlink_lower(struct dentry *dentry); 388caf70cb2SAmir Goldstein unsigned int ovl_get_nlink(struct dentry *lowerdentry, 389caf70cb2SAmir Goldstein struct dentry *upperdentry, 390caf70cb2SAmir Goldstein unsigned int fallback); 391e9be9d5eSMiklos Szeredi int ovl_setattr(struct dentry *dentry, struct iattr *attr); 3925b712091SMiklos Szeredi int ovl_getattr(const struct path *path, struct kstat *stat, 3935b712091SMiklos Szeredi u32 request_mask, unsigned int flags); 394e9be9d5eSMiklos Szeredi int ovl_permission(struct inode *inode, int mask); 3951d88f183SMiklos Szeredi int ovl_xattr_set(struct dentry *dentry, struct inode *inode, const char *name, 3961d88f183SMiklos Szeredi const void *value, size_t size, int flags); 3971d88f183SMiklos Szeredi int ovl_xattr_get(struct dentry *dentry, struct inode *inode, const char *name, 3980eb45fc3SAndreas Gruenbacher void *value, size_t size); 399e9be9d5eSMiklos Szeredi ssize_t ovl_listxattr(struct dentry *dentry, char *list, size_t size); 40039a25b2bSVivek Goyal struct posix_acl *ovl_get_acl(struct inode *inode, int type); 40195582b00SDeepa Dinamani int ovl_update_time(struct inode *inode, struct timespec64 *ts, int flags); 4020956254aSMiklos Szeredi bool ovl_is_private_xattr(const char *name); 403e9be9d5eSMiklos Szeredi 404ac6a52ebSVivek Goyal struct ovl_inode_params { 40501b39dccSAmir Goldstein struct inode *newinode; 406ac6a52ebSVivek Goyal struct dentry *upperdentry; 407ac6a52ebSVivek Goyal struct ovl_path *lowerpath; 408ac6a52ebSVivek Goyal struct dentry *index; 409ac6a52ebSVivek Goyal unsigned int numlower; 4109cec54c8SVivek Goyal char *redirect; 4112664bd08SVivek Goyal struct dentry *lowerdata; 412ac6a52ebSVivek Goyal }; 41362c832edSAmir Goldstein void ovl_inode_init(struct inode *inode, struct ovl_inode_params *oip, 41462c832edSAmir Goldstein unsigned long ino, int fsid); 415ca4c8a3aSMiklos Szeredi struct inode *ovl_new_inode(struct super_block *sb, umode_t mode, dev_t rdev); 4164b91c30aSAmir Goldstein struct inode *ovl_lookup_inode(struct super_block *sb, struct dentry *real, 4174b91c30aSAmir Goldstein bool is_upper); 418146d62e5SAmir Goldstein bool ovl_lookup_trap_inode(struct super_block *sb, struct dentry *dir); 419146d62e5SAmir Goldstein struct inode *ovl_get_trap_inode(struct super_block *sb, struct dentry *dir); 420ac6a52ebSVivek Goyal struct inode *ovl_get_inode(struct super_block *sb, 421ac6a52ebSVivek Goyal struct ovl_inode_params *oip); 422e9be9d5eSMiklos Szeredi static inline void ovl_copyattr(struct inode *from, struct inode *to) 423e9be9d5eSMiklos Szeredi { 424e9be9d5eSMiklos Szeredi to->i_uid = from->i_uid; 425e9be9d5eSMiklos Szeredi to->i_gid = from->i_gid; 42607a2daabSVivek Goyal to->i_mode = from->i_mode; 427d719e8f2SMiklos Szeredi to->i_atime = from->i_atime; 428d719e8f2SMiklos Szeredi to->i_mtime = from->i_mtime; 429d719e8f2SMiklos Szeredi to->i_ctime = from->i_ctime; 43046e5d0a3SMiklos Szeredi i_size_write(to, i_size_read(from)); 431e9be9d5eSMiklos Szeredi } 432e9be9d5eSMiklos Szeredi 4334f357295SMiklos Szeredi static inline void ovl_copyflags(struct inode *from, struct inode *to) 4344f357295SMiklos Szeredi { 4354f357295SMiklos Szeredi unsigned int mask = S_SYNC | S_IMMUTABLE | S_APPEND | S_NOATIME; 4364f357295SMiklos Szeredi 4374f357295SMiklos Szeredi inode_set_flags(to, from->i_flags & mask, mask); 4384f357295SMiklos Szeredi } 4394f357295SMiklos Szeredi 440e9be9d5eSMiklos Szeredi /* dir.c */ 441e9be9d5eSMiklos Szeredi extern const struct inode_operations ovl_dir_inode_operations; 442e7dd0e71SAmir Goldstein int ovl_cleanup_and_whiteout(struct dentry *workdir, struct inode *dir, 443e7dd0e71SAmir Goldstein struct dentry *dentry); 444471ec5dcSAmir Goldstein struct ovl_cattr { 44532a3d848SAl Viro dev_t rdev; 44632a3d848SAl Viro umode_t mode; 44732a3d848SAl Viro const char *link; 448471ec5dcSAmir Goldstein struct dentry *hardlink; 44932a3d848SAl Viro }; 450471ec5dcSAmir Goldstein 451471ec5dcSAmir Goldstein #define OVL_CATTR(m) (&(struct ovl_cattr) { .mode = (m) }) 452471ec5dcSAmir Goldstein 45395a1c815SMiklos Szeredi struct dentry *ovl_create_real(struct inode *dir, struct dentry *newdentry, 454471ec5dcSAmir Goldstein struct ovl_cattr *attr); 455415543d5SAmir Goldstein int ovl_cleanup(struct inode *dir, struct dentry *dentry); 456cad218abSAmir Goldstein struct dentry *ovl_lookup_temp(struct dentry *workdir); 457137ec526SAmir Goldstein struct dentry *ovl_create_temp(struct dentry *workdir, struct ovl_cattr *attr); 458e9be9d5eSMiklos Szeredi 459d1d04ef8SMiklos Szeredi /* file.c */ 460d1d04ef8SMiklos Szeredi extern const struct file_operations ovl_file_operations; 4612406a307SJiufei Xue int __init ovl_aio_request_cache_init(void); 4622406a307SJiufei Xue void ovl_aio_request_cache_destroy(void); 463d1d04ef8SMiklos Szeredi 464e9be9d5eSMiklos Szeredi /* copy_up.c */ 465e9be9d5eSMiklos Szeredi int ovl_copy_up(struct dentry *dentry); 466d1e6f6a9SVivek Goyal int ovl_copy_up_with_data(struct dentry *dentry); 4679aba6521SAmir Goldstein int ovl_copy_up_flags(struct dentry *dentry, int flags); 4683428030dSAmir Goldstein int ovl_maybe_copy_up(struct dentry *dentry, int flags); 469e9be9d5eSMiklos Szeredi int ovl_copy_xattr(struct dentry *old, struct dentry *new); 470e9be9d5eSMiklos Szeredi int ovl_set_attr(struct dentry *upper, struct kstat *stat); 4715b2cccd3SAmir Goldstein struct ovl_fh *ovl_encode_real_fh(struct dentry *real, bool is_upper); 4729678e630SAmir Goldstein int ovl_set_origin(struct dentry *dentry, struct dentry *lower, 4739678e630SAmir Goldstein struct dentry *upper); 4748ed5eec9SAmir Goldstein 4758ed5eec9SAmir Goldstein /* export.c */ 4768ed5eec9SAmir Goldstein extern const struct export_operations ovl_export_operations; 477