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 51926e94d7SAmir Goldstein enum { 52926e94d7SAmir Goldstein OVL_XINO_OFF, 53926e94d7SAmir Goldstein OVL_XINO_AUTO, 54926e94d7SAmir Goldstein OVL_XINO_ON, 55926e94d7SAmir Goldstein }; 56926e94d7SAmir Goldstein 573a1e819bSAmir Goldstein /* 583a1e819bSAmir Goldstein * The tuple (fh,uuid) is a universal unique identifier for a copy up origin, 593a1e819bSAmir Goldstein * where: 603a1e819bSAmir Goldstein * origin.fh - exported file handle of the lower file 613a1e819bSAmir Goldstein * origin.uuid - uuid of the lower filesystem 623a1e819bSAmir Goldstein */ 633a1e819bSAmir Goldstein #define OVL_FH_VERSION 0 643a1e819bSAmir Goldstein #define OVL_FH_MAGIC 0xfb 653a1e819bSAmir Goldstein 663a1e819bSAmir Goldstein /* CPU byte order required for fid decoding: */ 673a1e819bSAmir Goldstein #define OVL_FH_FLAG_BIG_ENDIAN (1 << 0) 683a1e819bSAmir Goldstein #define OVL_FH_FLAG_ANY_ENDIAN (1 << 1) 6954fb347eSAmir Goldstein /* Is the real inode encoded in fid an upper inode? */ 7054fb347eSAmir Goldstein #define OVL_FH_FLAG_PATH_UPPER (1 << 2) 713a1e819bSAmir Goldstein 72961af647SAmir Goldstein #define OVL_FH_FLAG_ALL (OVL_FH_FLAG_BIG_ENDIAN | OVL_FH_FLAG_ANY_ENDIAN | \ 73961af647SAmir Goldstein OVL_FH_FLAG_PATH_UPPER) 743a1e819bSAmir Goldstein 753a1e819bSAmir Goldstein #if defined(__LITTLE_ENDIAN) 763a1e819bSAmir Goldstein #define OVL_FH_FLAG_CPU_ENDIAN 0 773a1e819bSAmir Goldstein #elif defined(__BIG_ENDIAN) 783a1e819bSAmir Goldstein #define OVL_FH_FLAG_CPU_ENDIAN OVL_FH_FLAG_BIG_ENDIAN 793a1e819bSAmir Goldstein #else 803a1e819bSAmir Goldstein #error Endianness not defined 813a1e819bSAmir Goldstein #endif 823a1e819bSAmir Goldstein 83cbe7fba8SAmir Goldstein /* The type used to be returned by overlay exportfs for misaligned fid */ 84cbe7fba8SAmir Goldstein #define OVL_FILEID_V0 0xfb 85cbe7fba8SAmir Goldstein /* The type returned by overlay exportfs for 32bit aligned fid */ 86cbe7fba8SAmir Goldstein #define OVL_FILEID_V1 0xf8 878ed5eec9SAmir Goldstein 88cbe7fba8SAmir Goldstein /* On-disk format for "origin" file handle */ 89cbe7fba8SAmir Goldstein struct ovl_fb { 903a1e819bSAmir Goldstein u8 version; /* 0 */ 913a1e819bSAmir Goldstein u8 magic; /* 0xfb */ 923a1e819bSAmir Goldstein u8 len; /* size of this header + size of fid */ 933a1e819bSAmir Goldstein u8 flags; /* OVL_FH_FLAG_* */ 943a1e819bSAmir Goldstein u8 type; /* fid_type of fid */ 9501633fd2SChristoph Hellwig uuid_t uuid; /* uuid of filesystem */ 960efbe7c4SGustavo A. R. Silva u32 fid[]; /* file identifier should be 32bit aligned in-memory */ 973a1e819bSAmir Goldstein } __packed; 98e9be9d5eSMiklos Szeredi 99cbe7fba8SAmir Goldstein /* In-memory and on-wire format for overlay file handle */ 100cbe7fba8SAmir Goldstein struct ovl_fh { 101cbe7fba8SAmir Goldstein u8 padding[3]; /* make sure fb.fid is 32bit aligned */ 102cbe7fba8SAmir Goldstein union { 103cbe7fba8SAmir Goldstein struct ovl_fb fb; 104cbe7fba8SAmir Goldstein u8 buf[0]; 105cbe7fba8SAmir Goldstein }; 106cbe7fba8SAmir Goldstein } __packed; 107cbe7fba8SAmir Goldstein 108cbe7fba8SAmir Goldstein #define OVL_FH_WIRE_OFFSET offsetof(struct ovl_fh, fb) 109cbe7fba8SAmir Goldstein #define OVL_FH_LEN(fh) (OVL_FH_WIRE_OFFSET + (fh)->fb.len) 110cbe7fba8SAmir Goldstein #define OVL_FH_FID_OFFSET (OVL_FH_WIRE_OFFSET + \ 111cbe7fba8SAmir Goldstein offsetof(struct ovl_fb, fid)) 112cbe7fba8SAmir Goldstein 113e9be9d5eSMiklos Szeredi static inline int ovl_do_rmdir(struct inode *dir, struct dentry *dentry) 114e9be9d5eSMiklos Szeredi { 115e9be9d5eSMiklos Szeredi int err = vfs_rmdir(dir, dentry); 1166cf00764SAmir Goldstein 117e9be9d5eSMiklos Szeredi pr_debug("rmdir(%pd2) = %i\n", dentry, err); 118e9be9d5eSMiklos Szeredi return err; 119e9be9d5eSMiklos Szeredi } 120e9be9d5eSMiklos Szeredi 121e9be9d5eSMiklos Szeredi static inline int ovl_do_unlink(struct inode *dir, struct dentry *dentry) 122e9be9d5eSMiklos Szeredi { 123e9be9d5eSMiklos Szeredi int err = vfs_unlink(dir, dentry, NULL); 1246cf00764SAmir Goldstein 125e9be9d5eSMiklos Szeredi pr_debug("unlink(%pd2) = %i\n", dentry, err); 126e9be9d5eSMiklos Szeredi return err; 127e9be9d5eSMiklos Szeredi } 128e9be9d5eSMiklos Szeredi 129e9be9d5eSMiklos Szeredi static inline int ovl_do_link(struct dentry *old_dentry, struct inode *dir, 1306cf00764SAmir Goldstein struct dentry *new_dentry) 131e9be9d5eSMiklos Szeredi { 132e9be9d5eSMiklos Szeredi int err = vfs_link(old_dentry, dir, new_dentry, NULL); 1336cf00764SAmir Goldstein 1346cf00764SAmir Goldstein pr_debug("link(%pd2, %pd2) = %i\n", old_dentry, new_dentry, err); 135e9be9d5eSMiklos Szeredi return err; 136e9be9d5eSMiklos Szeredi } 137e9be9d5eSMiklos Szeredi 138e9be9d5eSMiklos Szeredi static inline int ovl_do_create(struct inode *dir, struct dentry *dentry, 1396cf00764SAmir Goldstein umode_t mode) 140e9be9d5eSMiklos Szeredi { 141e9be9d5eSMiklos Szeredi int err = vfs_create(dir, dentry, mode, true); 1426cf00764SAmir Goldstein 143e9be9d5eSMiklos Szeredi pr_debug("create(%pd2, 0%o) = %i\n", dentry, mode, err); 144e9be9d5eSMiklos Szeredi return err; 145e9be9d5eSMiklos Szeredi } 146e9be9d5eSMiklos Szeredi 147e9be9d5eSMiklos Szeredi static inline int ovl_do_mkdir(struct inode *dir, struct dentry *dentry, 1486cf00764SAmir Goldstein umode_t mode) 149e9be9d5eSMiklos Szeredi { 150e9be9d5eSMiklos Szeredi int err = vfs_mkdir(dir, dentry, mode); 151e9be9d5eSMiklos Szeredi pr_debug("mkdir(%pd2, 0%o) = %i\n", dentry, mode, err); 152e9be9d5eSMiklos Szeredi return err; 153e9be9d5eSMiklos Szeredi } 154e9be9d5eSMiklos Szeredi 155e9be9d5eSMiklos Szeredi static inline int ovl_do_mknod(struct inode *dir, struct dentry *dentry, 1566cf00764SAmir Goldstein umode_t mode, dev_t dev) 157e9be9d5eSMiklos Szeredi { 158e9be9d5eSMiklos Szeredi int err = vfs_mknod(dir, dentry, mode, dev); 1596cf00764SAmir Goldstein 1606cf00764SAmir Goldstein pr_debug("mknod(%pd2, 0%o, 0%o) = %i\n", dentry, mode, dev, err); 161e9be9d5eSMiklos Szeredi return err; 162e9be9d5eSMiklos Szeredi } 163e9be9d5eSMiklos Szeredi 164e9be9d5eSMiklos Szeredi static inline int ovl_do_symlink(struct inode *dir, struct dentry *dentry, 1656cf00764SAmir Goldstein const char *oldname) 166e9be9d5eSMiklos Szeredi { 167e9be9d5eSMiklos Szeredi int err = vfs_symlink(dir, dentry, oldname); 1686cf00764SAmir Goldstein 169e9be9d5eSMiklos Szeredi pr_debug("symlink(\"%s\", %pd2) = %i\n", oldname, dentry, err); 170e9be9d5eSMiklos Szeredi return err; 171e9be9d5eSMiklos Szeredi } 172e9be9d5eSMiklos Szeredi 173610afc0bSMiklos Szeredi static inline ssize_t ovl_do_getxattr(struct ovl_fs *ofs, struct dentry *dentry, 174610afc0bSMiklos Szeredi const char *name, void *value, 175610afc0bSMiklos Szeredi size_t size) 176d5dc7486SMiklos Szeredi { 177d5dc7486SMiklos Szeredi return vfs_getxattr(dentry, name, value, size); 178d5dc7486SMiklos Szeredi } 179d5dc7486SMiklos Szeredi 180610afc0bSMiklos Szeredi static inline int ovl_do_setxattr(struct ovl_fs *ofs, struct dentry *dentry, 181610afc0bSMiklos Szeredi const char *name, const void *value, 182610afc0bSMiklos Szeredi size_t size) 183e9be9d5eSMiklos Szeredi { 18426150ab5SMiklos Szeredi int err = vfs_setxattr(dentry, name, value, size, 0); 18526150ab5SMiklos Szeredi pr_debug("setxattr(%pd2, \"%s\", \"%*pE\", %zu, 0) = %i\n", 18626150ab5SMiklos Szeredi dentry, name, min((int)size, 48), value, size, err); 187e9be9d5eSMiklos Szeredi return err; 188e9be9d5eSMiklos Szeredi } 189e9be9d5eSMiklos Szeredi 190610afc0bSMiklos Szeredi static inline int ovl_do_removexattr(struct ovl_fs *ofs, struct dentry *dentry, 191610afc0bSMiklos Szeredi const char *name) 192e9be9d5eSMiklos Szeredi { 193e9be9d5eSMiklos Szeredi int err = vfs_removexattr(dentry, name); 194e9be9d5eSMiklos Szeredi pr_debug("removexattr(%pd2, \"%s\") = %i\n", dentry, name, err); 195e9be9d5eSMiklos Szeredi return err; 196e9be9d5eSMiklos Szeredi } 197e9be9d5eSMiklos Szeredi 198e9be9d5eSMiklos Szeredi static inline int ovl_do_rename(struct inode *olddir, struct dentry *olddentry, 199e9be9d5eSMiklos Szeredi struct inode *newdir, struct dentry *newdentry, 200e9be9d5eSMiklos Szeredi unsigned int flags) 201e9be9d5eSMiklos Szeredi { 202e9be9d5eSMiklos Szeredi int err; 203e9be9d5eSMiklos Szeredi 2046cf00764SAmir Goldstein pr_debug("rename(%pd2, %pd2, 0x%x)\n", olddentry, newdentry, flags); 205e9be9d5eSMiklos Szeredi err = vfs_rename(olddir, olddentry, newdir, newdentry, NULL, flags); 206e9be9d5eSMiklos Szeredi if (err) { 2072773bf00SMiklos Szeredi pr_debug("...rename(%pd2, %pd2, ...) = %i\n", 208e9be9d5eSMiklos Szeredi olddentry, newdentry, err); 209e9be9d5eSMiklos Szeredi } 210e9be9d5eSMiklos Szeredi return err; 211e9be9d5eSMiklos Szeredi } 212e9be9d5eSMiklos Szeredi 213e9be9d5eSMiklos Szeredi static inline int ovl_do_whiteout(struct inode *dir, struct dentry *dentry) 214e9be9d5eSMiklos Szeredi { 215e9be9d5eSMiklos Szeredi int err = vfs_whiteout(dir, dentry); 216e9be9d5eSMiklos Szeredi pr_debug("whiteout(%pd2) = %i\n", dentry, err); 217e9be9d5eSMiklos Szeredi return err; 218e9be9d5eSMiklos Szeredi } 219e9be9d5eSMiklos Szeredi 220e7f52429SAmir Goldstein static inline struct dentry *ovl_do_tmpfile(struct dentry *dentry, umode_t mode) 221e7f52429SAmir Goldstein { 222e7f52429SAmir Goldstein struct dentry *ret = vfs_tmpfile(dentry, mode, 0); 2237879cb43SVasyl Gomonovych int err = PTR_ERR_OR_ZERO(ret); 224e7f52429SAmir Goldstein 225e7f52429SAmir Goldstein pr_debug("tmpfile(%pd2, 0%o) = %i\n", dentry, mode, err); 226e7f52429SAmir Goldstein return ret; 227e7f52429SAmir Goldstein } 228e7f52429SAmir Goldstein 2290c288874SVivek Goyal static inline bool ovl_open_flags_need_copy_up(int flags) 2300c288874SVivek Goyal { 2310c288874SVivek Goyal if (!flags) 2320c288874SVivek Goyal return false; 2330c288874SVivek Goyal 2340c288874SVivek Goyal return ((OPEN_FMODE(flags) & FMODE_WRITE) || (flags & O_TRUNC)); 2350c288874SVivek Goyal } 2360c288874SVivek Goyal 237bbb1e54dSMiklos Szeredi /* util.c */ 238bbb1e54dSMiklos Szeredi int ovl_want_write(struct dentry *dentry); 239bbb1e54dSMiklos Szeredi void ovl_drop_write(struct dentry *dentry); 240bbb1e54dSMiklos Szeredi struct dentry *ovl_workdir(struct dentry *dentry); 241bbb1e54dSMiklos Szeredi const struct cred *ovl_override_creds(struct super_block *sb); 242e487d889SAmir Goldstein int ovl_can_decode_fh(struct super_block *sb); 24302bcd157SAmir Goldstein struct dentry *ovl_indexdir(struct super_block *sb); 244f168f109SAmir Goldstein bool ovl_index_all(struct super_block *sb); 245f168f109SAmir Goldstein bool ovl_verify_lower(struct super_block *sb); 246bbb1e54dSMiklos Szeredi struct ovl_entry *ovl_alloc_entry(unsigned int numlower); 247bbb1e54dSMiklos Szeredi bool ovl_dentry_remote(struct dentry *dentry); 248f4288844SMiklos Szeredi void ovl_dentry_update_reval(struct dentry *dentry, struct dentry *upperdentry, 249f4288844SMiklos Szeredi unsigned int mask); 250bbb1e54dSMiklos Szeredi bool ovl_dentry_weird(struct dentry *dentry); 251e9be9d5eSMiklos Szeredi enum ovl_path_type ovl_path_type(struct dentry *dentry); 252e9be9d5eSMiklos Szeredi void ovl_path_upper(struct dentry *dentry, struct path *path); 253e9be9d5eSMiklos Szeredi void ovl_path_lower(struct dentry *dentry, struct path *path); 2544f93b426SVivek Goyal void ovl_path_lowerdata(struct dentry *dentry, struct path *path); 255e9be9d5eSMiklos Szeredi enum ovl_path_type ovl_path_real(struct dentry *dentry, struct path *path); 256e9be9d5eSMiklos Szeredi struct dentry *ovl_dentry_upper(struct dentry *dentry); 257e9be9d5eSMiklos Szeredi struct dentry *ovl_dentry_lower(struct dentry *dentry); 258647d253fSVivek Goyal struct dentry *ovl_dentry_lowerdata(struct dentry *dentry); 25913464165SMiklos Szeredi const struct ovl_layer *ovl_layer_lower(struct dentry *dentry); 260e9be9d5eSMiklos Szeredi struct dentry *ovl_dentry_real(struct dentry *dentry); 2611d88f183SMiklos Szeredi struct dentry *ovl_i_dentry_upper(struct inode *inode); 26209d8b586SMiklos Szeredi struct inode *ovl_inode_upper(struct inode *inode); 26309d8b586SMiklos Szeredi struct inode *ovl_inode_lower(struct inode *inode); 2642664bd08SVivek Goyal struct inode *ovl_inode_lowerdata(struct inode *inode); 26509d8b586SMiklos Szeredi struct inode *ovl_inode_real(struct inode *inode); 2664823d49cSVivek Goyal struct inode *ovl_inode_realdata(struct inode *inode); 2674edb83bbSMiklos Szeredi struct ovl_dir_cache *ovl_dir_cache(struct inode *inode); 2684edb83bbSMiklos Szeredi void ovl_set_dir_cache(struct inode *inode, struct ovl_dir_cache *cache); 269c62520a8SAmir Goldstein void ovl_dentry_set_flag(unsigned long flag, struct dentry *dentry); 270c62520a8SAmir Goldstein void ovl_dentry_clear_flag(unsigned long flag, struct dentry *dentry); 271c62520a8SAmir Goldstein bool ovl_dentry_test_flag(unsigned long flag, struct dentry *dentry); 272e9be9d5eSMiklos Szeredi bool ovl_dentry_is_opaque(struct dentry *dentry); 273c412ce49SMiklos Szeredi bool ovl_dentry_is_whiteout(struct dentry *dentry); 2745cf5b477SMiklos Szeredi void ovl_dentry_set_opaque(struct dentry *dentry); 27555acc661SMiklos Szeredi bool ovl_dentry_has_upper_alias(struct dentry *dentry); 27655acc661SMiklos Szeredi void ovl_dentry_set_upper_alias(struct dentry *dentry); 2770c288874SVivek Goyal bool ovl_dentry_needs_data_copy_up(struct dentry *dentry, int flags); 2780c288874SVivek Goyal bool ovl_dentry_needs_data_copy_up_locked(struct dentry *dentry, int flags); 2790c288874SVivek Goyal bool ovl_has_upperdata(struct inode *inode); 2800c288874SVivek Goyal void ovl_set_upperdata(struct inode *inode); 281a6c60655SMiklos Szeredi bool ovl_redirect_dir(struct super_block *sb); 282a6c60655SMiklos Szeredi const char *ovl_dentry_get_redirect(struct dentry *dentry); 283a6c60655SMiklos Szeredi void ovl_dentry_set_redirect(struct dentry *dentry, const char *redirect); 28409d8b586SMiklos Szeredi void ovl_inode_update(struct inode *inode, struct dentry *upperdentry); 285d9854c87SMiklos Szeredi void ovl_dir_modified(struct dentry *dentry, bool impurity); 286bbb1e54dSMiklos Szeredi u64 ovl_dentry_version_get(struct dentry *dentry); 287bbb1e54dSMiklos Szeredi bool ovl_is_whiteout(struct dentry *dentry); 288e9be9d5eSMiklos Szeredi struct file *ovl_path_open(struct path *path, int flags); 2890c288874SVivek Goyal int ovl_copy_up_start(struct dentry *dentry, int flags); 29039d3d60aSAmir Goldstein void ovl_copy_up_end(struct dentry *dentry); 2910c288874SVivek Goyal bool ovl_already_copied_up(struct dentry *dentry, int flags); 292610afc0bSMiklos Szeredi bool ovl_check_origin_xattr(struct ovl_fs *ofs, struct dentry *dentry); 293610afc0bSMiklos Szeredi bool ovl_check_dir_xattr(struct super_block *sb, struct dentry *dentry, 294610afc0bSMiklos Szeredi const char *name); 295f3a15685SAmir Goldstein int ovl_check_setxattr(struct dentry *dentry, struct dentry *upperdentry, 296f3a15685SAmir Goldstein const char *name, const void *value, size_t size, 297f3a15685SAmir Goldstein int xerr); 298f3a15685SAmir Goldstein int ovl_set_impure(struct dentry *dentry, struct dentry *upperdentry); 29913c72075SMiklos Szeredi void ovl_set_flag(unsigned long flag, struct inode *inode); 3004edb83bbSMiklos Szeredi void ovl_clear_flag(unsigned long flag, struct inode *inode); 30113c72075SMiklos Szeredi bool ovl_test_flag(unsigned long flag, struct inode *inode); 302ad0af710SAmir Goldstein bool ovl_inuse_trylock(struct dentry *dentry); 303ad0af710SAmir Goldstein void ovl_inuse_unlock(struct dentry *dentry); 304146d62e5SAmir Goldstein bool ovl_is_inuse(struct dentry *dentry); 30524b33ee1SAmir Goldstein bool ovl_need_index(struct dentry *dentry); 3060e32992fSAmir Goldstein int ovl_nlink_start(struct dentry *dentry); 3070e32992fSAmir Goldstein void ovl_nlink_end(struct dentry *dentry); 3085820dc08SAmir Goldstein int ovl_lock_rename_workdir(struct dentry *workdir, struct dentry *upperdir); 309610afc0bSMiklos Szeredi int ovl_check_metacopy_xattr(struct ovl_fs *ofs, struct dentry *dentry); 31067d756c2SVivek Goyal bool ovl_is_metacopy_dentry(struct dentry *dentry); 311610afc0bSMiklos Szeredi char *ovl_get_redirect_xattr(struct ovl_fs *ofs, struct dentry *dentry, 312610afc0bSMiklos Szeredi int padding); 313f3a15685SAmir Goldstein 314610afc0bSMiklos Szeredi static inline bool ovl_is_impuredir(struct super_block *sb, 315610afc0bSMiklos Szeredi struct dentry *dentry) 316f3a15685SAmir Goldstein { 317610afc0bSMiklos Szeredi return ovl_check_dir_xattr(sb, dentry, OVL_XATTR_IMPURE); 318f3a15685SAmir Goldstein } 319f3a15685SAmir Goldstein 320926e94d7SAmir Goldstein /* 321926e94d7SAmir Goldstein * With xino=auto, we do best effort to keep all inodes on same st_dev and 322926e94d7SAmir Goldstein * d_ino consistent with st_ino. 323926e94d7SAmir Goldstein * With xino=on, we do the same effort but we warn if we failed. 324926e94d7SAmir Goldstein */ 325926e94d7SAmir Goldstein static inline bool ovl_xino_warn(struct super_block *sb) 326926e94d7SAmir Goldstein { 327926e94d7SAmir Goldstein return OVL_FS(sb)->config.xino == OVL_XINO_ON; 328926e94d7SAmir Goldstein } 329926e94d7SAmir Goldstein 3300f831ec8SAmir Goldstein /* All layers on same fs? */ 3310f831ec8SAmir Goldstein static inline bool ovl_same_fs(struct super_block *sb) 3320f831ec8SAmir Goldstein { 3330f831ec8SAmir Goldstein return OVL_FS(sb)->xino_mode == 0; 3340f831ec8SAmir Goldstein } 3350f831ec8SAmir Goldstein 3360f831ec8SAmir Goldstein /* All overlay inodes have same st_dev? */ 3370f831ec8SAmir Goldstein static inline bool ovl_same_dev(struct super_block *sb) 3380f831ec8SAmir Goldstein { 3390f831ec8SAmir Goldstein return OVL_FS(sb)->xino_mode >= 0; 3400f831ec8SAmir Goldstein } 3410f831ec8SAmir Goldstein 342e487d889SAmir Goldstein static inline unsigned int ovl_xino_bits(struct super_block *sb) 343e487d889SAmir Goldstein { 3440f831ec8SAmir Goldstein return ovl_same_dev(sb) ? OVL_FS(sb)->xino_mode : 0; 345e487d889SAmir Goldstein } 346e487d889SAmir Goldstein 347531d3040SAmir Goldstein static inline void ovl_inode_lock(struct inode *inode) 348531d3040SAmir Goldstein { 349531d3040SAmir Goldstein mutex_lock(&OVL_I(inode)->lock); 350531d3040SAmir Goldstein } 351531d3040SAmir Goldstein 352531d3040SAmir Goldstein static inline int ovl_inode_lock_interruptible(struct inode *inode) 3531e92e307SAmir Goldstein { 3541e92e307SAmir Goldstein return mutex_lock_interruptible(&OVL_I(inode)->lock); 3551e92e307SAmir Goldstein } 3561e92e307SAmir Goldstein 3571e92e307SAmir Goldstein static inline void ovl_inode_unlock(struct inode *inode) 3581e92e307SAmir Goldstein { 3591e92e307SAmir Goldstein mutex_unlock(&OVL_I(inode)->lock); 3601e92e307SAmir Goldstein } 3611e92e307SAmir Goldstein 362e9be9d5eSMiklos Szeredi 363bbb1e54dSMiklos Szeredi /* namei.c */ 364cbe7fba8SAmir Goldstein int ovl_check_fb_len(struct ovl_fb *fb, int fb_len); 365cbe7fba8SAmir Goldstein 366cbe7fba8SAmir Goldstein static inline int ovl_check_fh_len(struct ovl_fh *fh, int fh_len) 367cbe7fba8SAmir Goldstein { 368522f6e6cSAmir Goldstein if (fh_len < sizeof(struct ovl_fh)) 369522f6e6cSAmir Goldstein return -EINVAL; 370522f6e6cSAmir Goldstein 371cbe7fba8SAmir Goldstein return ovl_check_fb_len(&fh->fb, fh_len - OVL_FH_WIRE_OFFSET); 372cbe7fba8SAmir Goldstein } 373cbe7fba8SAmir Goldstein 3748a22efa1SAmir Goldstein struct dentry *ovl_decode_real_fh(struct ovl_fh *fh, struct vfsmount *mnt, 3758a22efa1SAmir Goldstein bool connected); 3768a22efa1SAmir Goldstein int ovl_check_origin_fh(struct ovl_fs *ofs, struct ovl_fh *fh, bool connected, 377f941866fSAmir Goldstein struct dentry *upperdentry, struct ovl_path **stackp); 378610afc0bSMiklos Szeredi int ovl_verify_set_fh(struct ovl_fs *ofs, struct dentry *dentry, 379610afc0bSMiklos Szeredi const char *name, struct dentry *real, bool is_upper, 380610afc0bSMiklos Szeredi bool set); 3813b0bfc6eSAmir Goldstein struct dentry *ovl_index_upper(struct ovl_fs *ofs, struct dentry *index); 3821eff1a1dSAmir Goldstein int ovl_verify_index(struct ovl_fs *ofs, struct dentry *index); 383359f392cSAmir Goldstein int ovl_get_index_name(struct dentry *origin, struct qstr *name); 38491ffe7beSAmir Goldstein struct dentry *ovl_get_index_fh(struct ovl_fs *ofs, struct ovl_fh *fh); 38506170154SAmir Goldstein struct dentry *ovl_lookup_index(struct ovl_fs *ofs, struct dentry *upper, 38606170154SAmir Goldstein struct dentry *origin, bool verify); 387bbb1e54dSMiklos Szeredi int ovl_path_next(int idx, struct dentry *dentry, struct path *path); 3881eff1a1dSAmir Goldstein struct dentry *ovl_lookup(struct inode *dir, struct dentry *dentry, 3891eff1a1dSAmir Goldstein unsigned int flags); 390bbb1e54dSMiklos Szeredi bool ovl_lower_positive(struct dentry *dentry); 391e9be9d5eSMiklos Szeredi 392610afc0bSMiklos Szeredi static inline int ovl_verify_origin(struct ovl_fs *ofs, struct dentry *upper, 39305122443SAmir Goldstein struct dentry *origin, bool set) 39405122443SAmir Goldstein { 395610afc0bSMiklos Szeredi return ovl_verify_set_fh(ofs, upper, OVL_XATTR_ORIGIN, origin, 396610afc0bSMiklos Szeredi false, set); 39705122443SAmir Goldstein } 39805122443SAmir Goldstein 399610afc0bSMiklos Szeredi static inline int ovl_verify_upper(struct ovl_fs *ofs, struct dentry *index, 400ad1d615cSAmir Goldstein struct dentry *upper, bool set) 401ad1d615cSAmir Goldstein { 402610afc0bSMiklos Szeredi return ovl_verify_set_fh(ofs, index, OVL_XATTR_UPPER, upper, true, set); 403ad1d615cSAmir Goldstein } 404ad1d615cSAmir Goldstein 405e9be9d5eSMiklos Szeredi /* readdir.c */ 406e9be9d5eSMiklos Szeredi extern const struct file_operations ovl_dir_operations; 407e9be9d5eSMiklos Szeredi int ovl_check_empty_dir(struct dentry *dentry, struct list_head *list); 408e9be9d5eSMiklos Szeredi void ovl_cleanup_whiteouts(struct dentry *upper, struct list_head *list); 409e9be9d5eSMiklos Szeredi void ovl_cache_free(struct list_head *list); 4104edb83bbSMiklos Szeredi void ovl_dir_cache_free(struct inode *inode); 41145aebeafSVivek Goyal int ovl_check_d_type_supported(struct path *realpath); 4123011645bSAmir Goldstein int ovl_workdir_cleanup(struct inode *dir, struct vfsmount *mnt, 413eea2fb48SMiklos Szeredi struct dentry *dentry, int level); 4141eff1a1dSAmir Goldstein int ovl_indexdir_cleanup(struct ovl_fs *ofs); 415e9be9d5eSMiklos Szeredi 416e9be9d5eSMiklos Szeredi /* inode.c */ 4175f8415d6SAmir Goldstein int ovl_set_nlink_upper(struct dentry *dentry); 4185f8415d6SAmir Goldstein int ovl_set_nlink_lower(struct dentry *dentry); 419610afc0bSMiklos Szeredi unsigned int ovl_get_nlink(struct ovl_fs *ofs, struct dentry *lowerdentry, 420caf70cb2SAmir Goldstein struct dentry *upperdentry, 421caf70cb2SAmir Goldstein unsigned int fallback); 422e9be9d5eSMiklos Szeredi int ovl_setattr(struct dentry *dentry, struct iattr *attr); 4235b712091SMiklos Szeredi int ovl_getattr(const struct path *path, struct kstat *stat, 4245b712091SMiklos Szeredi u32 request_mask, unsigned int flags); 425e9be9d5eSMiklos Szeredi int ovl_permission(struct inode *inode, int mask); 4261d88f183SMiklos Szeredi int ovl_xattr_set(struct dentry *dentry, struct inode *inode, const char *name, 4271d88f183SMiklos Szeredi const void *value, size_t size, int flags); 4281d88f183SMiklos Szeredi int ovl_xattr_get(struct dentry *dentry, struct inode *inode, const char *name, 4290eb45fc3SAndreas Gruenbacher void *value, size_t size); 430e9be9d5eSMiklos Szeredi ssize_t ovl_listxattr(struct dentry *dentry, char *list, size_t size); 43139a25b2bSVivek Goyal struct posix_acl *ovl_get_acl(struct inode *inode, int type); 43295582b00SDeepa Dinamani int ovl_update_time(struct inode *inode, struct timespec64 *ts, int flags); 433610afc0bSMiklos Szeredi bool ovl_is_private_xattr(struct super_block *sb, const char *name); 434e9be9d5eSMiklos Szeredi 435ac6a52ebSVivek Goyal struct ovl_inode_params { 43601b39dccSAmir Goldstein struct inode *newinode; 437ac6a52ebSVivek Goyal struct dentry *upperdentry; 438ac6a52ebSVivek Goyal struct ovl_path *lowerpath; 43974c6e384SMiklos Szeredi bool index; 440ac6a52ebSVivek Goyal unsigned int numlower; 4419cec54c8SVivek Goyal char *redirect; 4422664bd08SVivek Goyal struct dentry *lowerdata; 443ac6a52ebSVivek Goyal }; 44462c832edSAmir Goldstein void ovl_inode_init(struct inode *inode, struct ovl_inode_params *oip, 44562c832edSAmir Goldstein unsigned long ino, int fsid); 446ca4c8a3aSMiklos Szeredi struct inode *ovl_new_inode(struct super_block *sb, umode_t mode, dev_t rdev); 4474b91c30aSAmir Goldstein struct inode *ovl_lookup_inode(struct super_block *sb, struct dentry *real, 4484b91c30aSAmir Goldstein bool is_upper); 449146d62e5SAmir Goldstein bool ovl_lookup_trap_inode(struct super_block *sb, struct dentry *dir); 450146d62e5SAmir Goldstein struct inode *ovl_get_trap_inode(struct super_block *sb, struct dentry *dir); 451ac6a52ebSVivek Goyal struct inode *ovl_get_inode(struct super_block *sb, 452ac6a52ebSVivek Goyal struct ovl_inode_params *oip); 453e9be9d5eSMiklos Szeredi static inline void ovl_copyattr(struct inode *from, struct inode *to) 454e9be9d5eSMiklos Szeredi { 455e9be9d5eSMiklos Szeredi to->i_uid = from->i_uid; 456e9be9d5eSMiklos Szeredi to->i_gid = from->i_gid; 45707a2daabSVivek Goyal to->i_mode = from->i_mode; 458d719e8f2SMiklos Szeredi to->i_atime = from->i_atime; 459d719e8f2SMiklos Szeredi to->i_mtime = from->i_mtime; 460d719e8f2SMiklos Szeredi to->i_ctime = from->i_ctime; 46146e5d0a3SMiklos Szeredi i_size_write(to, i_size_read(from)); 462e9be9d5eSMiklos Szeredi } 463e9be9d5eSMiklos Szeredi 4644f357295SMiklos Szeredi static inline void ovl_copyflags(struct inode *from, struct inode *to) 4654f357295SMiklos Szeredi { 4664f357295SMiklos Szeredi unsigned int mask = S_SYNC | S_IMMUTABLE | S_APPEND | S_NOATIME; 4674f357295SMiklos Szeredi 4684f357295SMiklos Szeredi inode_set_flags(to, from->i_flags & mask, mask); 4694f357295SMiklos Szeredi } 4704f357295SMiklos Szeredi 471e9be9d5eSMiklos Szeredi /* dir.c */ 472e9be9d5eSMiklos Szeredi extern const struct inode_operations ovl_dir_inode_operations; 473c21c839bSChengguang Xu int ovl_cleanup_and_whiteout(struct ovl_fs *ofs, struct inode *dir, 474e7dd0e71SAmir Goldstein struct dentry *dentry); 475471ec5dcSAmir Goldstein struct ovl_cattr { 47632a3d848SAl Viro dev_t rdev; 47732a3d848SAl Viro umode_t mode; 47832a3d848SAl Viro const char *link; 479471ec5dcSAmir Goldstein struct dentry *hardlink; 48032a3d848SAl Viro }; 481471ec5dcSAmir Goldstein 482471ec5dcSAmir Goldstein #define OVL_CATTR(m) (&(struct ovl_cattr) { .mode = (m) }) 483471ec5dcSAmir Goldstein 48495a1c815SMiklos Szeredi struct dentry *ovl_create_real(struct inode *dir, struct dentry *newdentry, 485471ec5dcSAmir Goldstein struct ovl_cattr *attr); 486415543d5SAmir Goldstein int ovl_cleanup(struct inode *dir, struct dentry *dentry); 487cad218abSAmir Goldstein struct dentry *ovl_lookup_temp(struct dentry *workdir); 488137ec526SAmir Goldstein struct dentry *ovl_create_temp(struct dentry *workdir, struct ovl_cattr *attr); 489e9be9d5eSMiklos Szeredi 490d1d04ef8SMiklos Szeredi /* file.c */ 491d1d04ef8SMiklos Szeredi extern const struct file_operations ovl_file_operations; 4922406a307SJiufei Xue int __init ovl_aio_request_cache_init(void); 4932406a307SJiufei Xue void ovl_aio_request_cache_destroy(void); 494d1d04ef8SMiklos Szeredi 495e9be9d5eSMiklos Szeredi /* copy_up.c */ 496e9be9d5eSMiklos Szeredi int ovl_copy_up(struct dentry *dentry); 497d1e6f6a9SVivek Goyal int ovl_copy_up_with_data(struct dentry *dentry); 4983428030dSAmir Goldstein int ovl_maybe_copy_up(struct dentry *dentry, int flags); 499610afc0bSMiklos Szeredi int ovl_copy_xattr(struct super_block *sb, struct dentry *old, 500610afc0bSMiklos Szeredi struct dentry *new); 501e9be9d5eSMiklos Szeredi int ovl_set_attr(struct dentry *upper, struct kstat *stat); 5025b2cccd3SAmir Goldstein struct ovl_fh *ovl_encode_real_fh(struct dentry *real, bool is_upper); 5039678e630SAmir Goldstein int ovl_set_origin(struct dentry *dentry, struct dentry *lower, 5049678e630SAmir Goldstein struct dentry *upper); 5058ed5eec9SAmir Goldstein 5068ed5eec9SAmir Goldstein /* export.c */ 5078ed5eec9SAmir Goldstein extern const struct export_operations ovl_export_operations; 508