| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Miklos Szeredi | 2064 | 40.41% | 47 | 22.27% |
| Amir Goldstein | 1710 | 33.48% | 93 | 44.08% |
| Christian Brauner | 683 | 13.37% | 22 | 10.43% |
| Alexander Larsson | 208 | 4.07% | 7 | 3.32% |
| Vivek Goyal | 205 | 4.01% | 19 | 9.00% |
| Pavel Tikhomirov | 60 | 1.17% | 1 | 0.47% |
| Al Viro | 38 | 0.74% | 3 | 1.42% |
| David Howells | 23 | 0.45% | 1 | 0.47% |
| Stefan Berger | 21 | 0.41% | 1 | 0.47% |
| Jiufei (Joyce) Xue | 19 | 0.37% | 1 | 0.47% |
| Vyacheslav Yurkov | 16 | 0.31% | 1 | 0.47% |
| Yang Xu | 11 | 0.22% | 1 | 0.47% |
| Antonio Murdaca | 10 | 0.20% | 1 | 0.47% |
| lijiazi | 10 | 0.20% | 1 | 0.47% |
| Chengguang Xu | 6 | 0.12% | 1 | 0.47% |
| Kees Cook | 5 | 0.10% | 1 | 0.47% |
| Sargun Dhillon | 3 | 0.06% | 1 | 0.47% |
| hujianyang | 3 | 0.06% | 1 | 0.47% |
| Zhihao Cheng | 3 | 0.06% | 1 | 0.47% |
| Tycho Andersen | 3 | 0.06% | 1 | 0.47% |
| Thomas Gleixner | 2 | 0.04% | 1 | 0.47% |
| Chandan Rajendra | 1 | 0.02% | 1 | 0.47% |
| Christoph Hellwig | 1 | 0.02% | 1 | 0.47% |
| Vasyl Gomonovych | 1 | 0.02% | 1 | 0.47% |
| Jan Blunck | 1 | 0.02% | 1 | 0.47% |
| Gustavo A. R. Silva | 1 | 0.02% | 1 | 0.47% |
| Total | 5108 | 211 |
/* SPDX-License-Identifier: GPL-2.0-only */ /* * * Copyright (C) 2011 Novell Inc. */ #include <linux/kernel.h> #include <linux/uuid.h> #include <linux/fs.h> #include <linux/fsverity.h> #include <linux/namei.h> #include <linux/posix_acl.h> #include <linux/posix_acl_xattr.h> #include "ovl_entry.h" #undef pr_fmt #define pr_fmt(fmt) "overlayfs: " fmt enum ovl_path_type { __OVL_PATH_UPPER = (1 << 0), __OVL_PATH_MERGE = (1 << 1), __OVL_PATH_ORIGIN = (1 << 2), }; #define OVL_TYPE_UPPER(type) ((type) & __OVL_PATH_UPPER) #define OVL_TYPE_MERGE(type) ((type) & __OVL_PATH_MERGE) #define OVL_TYPE_ORIGIN(type) ((type) & __OVL_PATH_ORIGIN) #define OVL_XATTR_NAMESPACE "overlay." #define OVL_XATTR_TRUSTED_PREFIX XATTR_TRUSTED_PREFIX OVL_XATTR_NAMESPACE #define OVL_XATTR_TRUSTED_PREFIX_LEN (sizeof(OVL_XATTR_TRUSTED_PREFIX) - 1) #define OVL_XATTR_USER_PREFIX XATTR_USER_PREFIX OVL_XATTR_NAMESPACE #define OVL_XATTR_USER_PREFIX_LEN (sizeof(OVL_XATTR_USER_PREFIX) - 1) #define OVL_XATTR_ESCAPE_PREFIX OVL_XATTR_NAMESPACE #define OVL_XATTR_ESCAPE_PREFIX_LEN (sizeof(OVL_XATTR_ESCAPE_PREFIX) - 1) #define OVL_XATTR_ESCAPE_TRUSTED_PREFIX OVL_XATTR_TRUSTED_PREFIX OVL_XATTR_ESCAPE_PREFIX #define OVL_XATTR_ESCAPE_TRUSTED_PREFIX_LEN (sizeof(OVL_XATTR_ESCAPE_TRUSTED_PREFIX) - 1) #define OVL_XATTR_ESCAPE_USER_PREFIX OVL_XATTR_USER_PREFIX OVL_XATTR_ESCAPE_PREFIX #define OVL_XATTR_ESCAPE_USER_PREFIX_LEN (sizeof(OVL_XATTR_ESCAPE_USER_PREFIX) - 1) enum ovl_xattr { OVL_XATTR_OPAQUE, OVL_XATTR_REDIRECT, OVL_XATTR_ORIGIN, OVL_XATTR_IMPURE, OVL_XATTR_NLINK, OVL_XATTR_UPPER, OVL_XATTR_UUID, OVL_XATTR_METACOPY, OVL_XATTR_PROTATTR, OVL_XATTR_XWHITEOUT, OVL_XATTR_XWHITEOUTS, }; enum ovl_inode_flag { /* Pure upper dir that may contain non pure upper entries */ OVL_IMPURE, /* Non-merge dir that may contain whiteout entries */ OVL_WHITEOUTS, OVL_INDEX, OVL_UPPERDATA, /* Inode number will remain constant over copy up. */ OVL_CONST_INO, OVL_HAS_DIGEST, OVL_VERIFIED_DIGEST, }; enum ovl_entry_flag { OVL_E_UPPER_ALIAS, OVL_E_OPAQUE, OVL_E_CONNECTED, }; enum { OVL_REDIRECT_OFF, /* "off" mode is never used. In effect */ OVL_REDIRECT_FOLLOW, /* ...it translates to either "follow" */ OVL_REDIRECT_NOFOLLOW, /* ...or "nofollow". */ OVL_REDIRECT_ON, }; enum { OVL_UUID_OFF, OVL_UUID_NULL, OVL_UUID_AUTO, OVL_UUID_ON, }; enum { OVL_XINO_OFF, OVL_XINO_AUTO, OVL_XINO_ON, }; enum { OVL_VERITY_OFF, OVL_VERITY_ON, OVL_VERITY_REQUIRE, }; /* * The tuple (fh,uuid) is a universal unique identifier for a copy up origin, * where: * origin.fh - exported file handle of the lower file * origin.uuid - uuid of the lower filesystem */ #define OVL_FH_VERSION 0 #define OVL_FH_MAGIC 0xfb /* CPU byte order required for fid decoding: */ #define OVL_FH_FLAG_BIG_ENDIAN (1 << 0) #define OVL_FH_FLAG_ANY_ENDIAN (1 << 1) /* Is the real inode encoded in fid an upper inode? */ #define OVL_FH_FLAG_PATH_UPPER (1 << 2) #define OVL_FH_FLAG_ALL (OVL_FH_FLAG_BIG_ENDIAN | OVL_FH_FLAG_ANY_ENDIAN | \ OVL_FH_FLAG_PATH_UPPER) #if defined(__LITTLE_ENDIAN) #define OVL_FH_FLAG_CPU_ENDIAN 0 #elif defined(__BIG_ENDIAN) #define OVL_FH_FLAG_CPU_ENDIAN OVL_FH_FLAG_BIG_ENDIAN #else #error Endianness not defined #endif /* The type used to be returned by overlay exportfs for misaligned fid */ #define OVL_FILEID_V0 0xfb /* The type returned by overlay exportfs for 32bit aligned fid */ #define OVL_FILEID_V1 0xf8 /* On-disk format for "origin" file handle */ struct ovl_fb { u8 version; /* 0 */ u8 magic; /* 0xfb */ u8 len; /* size of this header + size of fid */ u8 flags; /* OVL_FH_FLAG_* */ u8 type; /* fid_type of fid */ uuid_t uuid; /* uuid of filesystem */ u32 fid[]; /* file identifier should be 32bit aligned in-memory */ } __packed; /* In-memory and on-wire format for overlay file handle */ struct ovl_fh { u8 padding[3]; /* make sure fb.fid is 32bit aligned */ union { struct ovl_fb fb; DECLARE_FLEX_ARRAY(u8, buf); }; } __packed; #define OVL_FH_WIRE_OFFSET offsetof(struct ovl_fh, fb) #define OVL_FH_LEN(fh) (OVL_FH_WIRE_OFFSET + (fh)->fb.len) #define OVL_FH_FID_OFFSET (OVL_FH_WIRE_OFFSET + \ offsetof(struct ovl_fb, fid)) /* On-disk format for "metacopy" xattr (if non-zero size) */ struct ovl_metacopy { u8 version; /* 0 */ u8 len; /* size of this header + used digest bytes */ u8 flags; u8 digest_algo; /* FS_VERITY_HASH_ALG_* constant, 0 for no digest */ u8 digest[FS_VERITY_MAX_DIGEST_SIZE]; /* Only the used part on disk */ } __packed; #define OVL_METACOPY_MAX_SIZE (sizeof(struct ovl_metacopy)) #define OVL_METACOPY_MIN_SIZE (OVL_METACOPY_MAX_SIZE - FS_VERITY_MAX_DIGEST_SIZE) #define OVL_METACOPY_INIT { 0, OVL_METACOPY_MIN_SIZE } static inline int ovl_metadata_digest_size(const struct ovl_metacopy *metacopy) { if (metacopy->len < OVL_METACOPY_MIN_SIZE) return 0; return (int)metacopy->len - OVL_METACOPY_MIN_SIZE; } extern const char *const ovl_xattr_table[][2]; static inline const char *ovl_xattr(struct ovl_fs *ofs, enum ovl_xattr ox) { return ovl_xattr_table[ox][ofs->config.userxattr]; } /* * When changing ownership of an upper object map the intended ownership * according to the upper layer's idmapping. When an upper mount idmaps files * that are stored on-disk as owned by id 1001 to id 1000 this means stat on * this object will report it as being owned by id 1000 when calling stat via * the upper mount. * In order to change ownership of an object so stat reports id 1000 when * called on an idmapped upper mount the value written to disk - i.e., the * value stored in ia_*id - must 1001. The mount mapping helper will thus take * care to map 1000 to 1001. * The mnt idmapping helpers are nops if the upper layer isn't idmapped. */ static inline int ovl_do_notify_change(struct ovl_fs *ofs, struct dentry *upperdentry, struct iattr *attr) { return notify_change(ovl_upper_mnt_idmap(ofs), upperdentry, attr, NULL); } static inline int ovl_do_rmdir(struct ovl_fs *ofs, struct inode *dir, struct dentry *dentry) { int err = vfs_rmdir(ovl_upper_mnt_idmap(ofs), dir, dentry); pr_debug("rmdir(%pd2) = %i\n", dentry, err); return err; } static inline int ovl_do_unlink(struct ovl_fs *ofs, struct inode *dir, struct dentry *dentry) { int err = vfs_unlink(ovl_upper_mnt_idmap(ofs), dir, dentry, NULL); pr_debug("unlink(%pd2) = %i\n", dentry, err); return err; } static inline int ovl_do_link(struct ovl_fs *ofs, struct dentry *old_dentry, struct inode *dir, struct dentry *new_dentry) { int err = vfs_link(old_dentry, ovl_upper_mnt_idmap(ofs), dir, new_dentry, NULL); pr_debug("link(%pd2, %pd2) = %i\n", old_dentry, new_dentry, err); return err; } static inline int ovl_do_create(struct ovl_fs *ofs, struct inode *dir, struct dentry *dentry, umode_t mode) { int err = vfs_create(ovl_upper_mnt_idmap(ofs), dir, dentry, mode, true); pr_debug("create(%pd2, 0%o) = %i\n", dentry, mode, err); return err; } static inline int ovl_do_mkdir(struct ovl_fs *ofs, struct inode *dir, struct dentry *dentry, umode_t mode) { int err = vfs_mkdir(ovl_upper_mnt_idmap(ofs), dir, dentry, mode); pr_debug("mkdir(%pd2, 0%o) = %i\n", dentry, mode, err); return err; } static inline int ovl_do_mknod(struct ovl_fs *ofs, struct inode *dir, struct dentry *dentry, umode_t mode, dev_t dev) { int err = vfs_mknod(ovl_upper_mnt_idmap(ofs), dir, dentry, mode, dev); pr_debug("mknod(%pd2, 0%o, 0%o) = %i\n", dentry, mode, dev, err); return err; } static inline int ovl_do_symlink(struct ovl_fs *ofs, struct inode *dir, struct dentry *dentry, const char *oldname) { int err = vfs_symlink(ovl_upper_mnt_idmap(ofs), dir, dentry, oldname); pr_debug("symlink(\"%s\", %pd2) = %i\n", oldname, dentry, err); return err; } static inline ssize_t ovl_do_getxattr(const struct path *path, const char *name, void *value, size_t size) { int err, len; WARN_ON(path->dentry->d_sb != path->mnt->mnt_sb); err = vfs_getxattr(mnt_idmap(path->mnt), path->dentry, name, value, size); len = (value && err > 0) ? err : 0; pr_debug("getxattr(%pd2, \"%s\", \"%*pE\", %zu, 0) = %i\n", path->dentry, name, min(len, 48), value, size, err); return err; } static inline ssize_t ovl_getxattr_upper(struct ovl_fs *ofs, struct dentry *upperdentry, enum ovl_xattr ox, void *value, size_t size) { struct path upperpath = { .dentry = upperdentry, .mnt = ovl_upper_mnt(ofs), }; return ovl_do_getxattr(&upperpath, ovl_xattr(ofs, ox), value, size); } static inline ssize_t ovl_path_getxattr(struct ovl_fs *ofs, const struct path *path, enum ovl_xattr ox, void *value, size_t size) { return ovl_do_getxattr(path, ovl_xattr(ofs, ox), value, size); } static inline int ovl_do_setxattr(struct ovl_fs *ofs, struct dentry *dentry, const char *name, const void *value, size_t size, int flags) { int err = vfs_setxattr(ovl_upper_mnt_idmap(ofs), dentry, name, value, size, flags); pr_debug("setxattr(%pd2, \"%s\", \"%*pE\", %zu, %d) = %i\n", dentry, name, min((int)size, 48), value, size, flags, err); return err; } static inline int ovl_setxattr(struct ovl_fs *ofs, struct dentry *dentry, enum ovl_xattr ox, const void *value, size_t size) { return ovl_do_setxattr(ofs, dentry, ovl_xattr(ofs, ox), value, size, 0); } static inline int ovl_do_removexattr(struct ovl_fs *ofs, struct dentry *dentry, const char *name) { int err = vfs_removexattr(ovl_upper_mnt_idmap(ofs), dentry, name); pr_debug("removexattr(%pd2, \"%s\") = %i\n", dentry, name, err); return err; } static inline int ovl_removexattr(struct ovl_fs *ofs, struct dentry *dentry, enum ovl_xattr ox) { return ovl_do_removexattr(ofs, dentry, ovl_xattr(ofs, ox)); } static inline int ovl_do_set_acl(struct ovl_fs *ofs, struct dentry *dentry, const char *acl_name, struct posix_acl *acl) { return vfs_set_acl(ovl_upper_mnt_idmap(ofs), dentry, acl_name, acl); } static inline int ovl_do_remove_acl(struct ovl_fs *ofs, struct dentry *dentry, const char *acl_name) { return vfs_remove_acl(ovl_upper_mnt_idmap(ofs), dentry, acl_name); } static inline int ovl_do_rename(struct ovl_fs *ofs, struct inode *olddir, struct dentry *olddentry, struct inode *newdir, struct dentry *newdentry, unsigned int flags) { int err; struct renamedata rd = { .old_mnt_idmap = ovl_upper_mnt_idmap(ofs), .old_dir = olddir, .old_dentry = olddentry, .new_mnt_idmap = ovl_upper_mnt_idmap(ofs), .new_dir = newdir, .new_dentry = newdentry, .flags = flags, }; pr_debug("rename(%pd2, %pd2, 0x%x)\n", olddentry, newdentry, flags); err = vfs_rename(&rd); if (err) { pr_debug("...rename(%pd2, %pd2, ...) = %i\n", olddentry, newdentry, err); } return err; } static inline int ovl_do_whiteout(struct ovl_fs *ofs, struct inode *dir, struct dentry *dentry) { int err = vfs_whiteout(ovl_upper_mnt_idmap(ofs), dir, dentry); pr_debug("whiteout(%pd2) = %i\n", dentry, err); return err; } static inline struct file *ovl_do_tmpfile(struct ovl_fs *ofs, struct dentry *dentry, umode_t mode) { struct path path = { .mnt = ovl_upper_mnt(ofs), .dentry = dentry }; struct file *file = kernel_tmpfile_open(ovl_upper_mnt_idmap(ofs), &path, mode, O_LARGEFILE | O_WRONLY, current_cred()); int err = PTR_ERR_OR_ZERO(file); pr_debug("tmpfile(%pd2, 0%o) = %i\n", dentry, mode, err); return file; } static inline struct dentry *ovl_lookup_upper(struct ovl_fs *ofs, const char *name, struct dentry *base, int len) { return lookup_one(ovl_upper_mnt_idmap(ofs), name, base, len); } static inline bool ovl_open_flags_need_copy_up(int flags) { if (!flags) return false; return ((OPEN_FMODE(flags) & FMODE_WRITE) || (flags & O_TRUNC)); } static inline int ovl_do_getattr(const struct path *path, struct kstat *stat, u32 request_mask, unsigned int flags) { if (flags & AT_GETATTR_NOSEC) return vfs_getattr_nosec(path, stat, request_mask, flags); return vfs_getattr(path, stat, request_mask, flags); } /* util.c */ int ovl_get_write_access(struct dentry *dentry); void ovl_put_write_access(struct dentry *dentry); void ovl_start_write(struct dentry *dentry); void ovl_end_write(struct dentry *dentry); int ovl_want_write(struct dentry *dentry); void ovl_drop_write(struct dentry *dentry); struct dentry *ovl_workdir(struct dentry *dentry); const struct cred *ovl_override_creds(struct super_block *sb); int ovl_can_decode_fh(struct super_block *sb); struct dentry *ovl_indexdir(struct super_block *sb); bool ovl_index_all(struct super_block *sb); bool ovl_verify_lower(struct super_block *sb); struct ovl_path *ovl_stack_alloc(unsigned int n); void ovl_stack_cpy(struct ovl_path *dst, struct ovl_path *src, unsigned int n); void ovl_stack_put(struct ovl_path *stack, unsigned int n); void ovl_stack_free(struct ovl_path *stack, unsigned int n); struct ovl_entry *ovl_alloc_entry(unsigned int numlower); void ovl_free_entry(struct ovl_entry *oe); bool ovl_dentry_remote(struct dentry *dentry); void ovl_dentry_update_reval(struct dentry *dentry, struct dentry *realdentry); void ovl_dentry_init_reval(struct dentry *dentry, struct dentry *upperdentry, struct ovl_entry *oe); void ovl_dentry_init_flags(struct dentry *dentry, struct dentry *upperdentry, struct ovl_entry *oe, unsigned int mask); bool ovl_dentry_weird(struct dentry *dentry); enum ovl_path_type ovl_path_type(struct dentry *dentry); void ovl_path_upper(struct dentry *dentry, struct path *path); void ovl_path_lower(struct dentry *dentry, struct path *path); void ovl_path_lowerdata(struct dentry *dentry, struct path *path); struct inode *ovl_i_path_real(struct inode *inode, struct path *path); enum ovl_path_type ovl_path_real(struct dentry *dentry, struct path *path); enum ovl_path_type ovl_path_realdata(struct dentry *dentry, struct path *path); struct dentry *ovl_dentry_upper(struct dentry *dentry); struct dentry *ovl_dentry_lower(struct dentry *dentry); struct dentry *ovl_dentry_lowerdata(struct dentry *dentry); int ovl_dentry_set_lowerdata(struct dentry *dentry, struct ovl_path *datapath); const struct ovl_layer *ovl_i_layer_lower(struct inode *inode); const struct ovl_layer *ovl_layer_lower(struct dentry *dentry); struct dentry *ovl_dentry_real(struct dentry *dentry); struct dentry *ovl_i_dentry_upper(struct inode *inode); struct inode *ovl_inode_upper(struct inode *inode); struct inode *ovl_inode_lower(struct inode *inode); struct inode *ovl_inode_lowerdata(struct inode *inode); struct inode *ovl_inode_real(struct inode *inode); struct inode *ovl_inode_realdata(struct inode *inode); const char *ovl_lowerdata_redirect(struct inode *inode); struct ovl_dir_cache *ovl_dir_cache(struct inode *inode); void ovl_set_dir_cache(struct inode *inode, struct ovl_dir_cache *cache); void ovl_dentry_set_flag(unsigned long flag, struct dentry *dentry); void ovl_dentry_clear_flag(unsigned long flag, struct dentry *dentry); bool ovl_dentry_test_flag(unsigned long flag, struct dentry *dentry); bool ovl_dentry_is_opaque(struct dentry *dentry); bool ovl_dentry_is_whiteout(struct dentry *dentry); void ovl_dentry_set_opaque(struct dentry *dentry); bool ovl_dentry_has_upper_alias(struct dentry *dentry); void ovl_dentry_set_upper_alias(struct dentry *dentry); bool ovl_dentry_needs_data_copy_up(struct dentry *dentry, int flags); bool ovl_dentry_needs_data_copy_up_locked(struct dentry *dentry, int flags); bool ovl_has_upperdata(struct inode *inode); void ovl_set_upperdata(struct inode *inode); const char *ovl_dentry_get_redirect(struct dentry *dentry); void ovl_dentry_set_redirect(struct dentry *dentry, const char *redirect); void ovl_inode_update(struct inode *inode, struct dentry *upperdentry); void ovl_dir_modified(struct dentry *dentry, bool impurity); u64 ovl_inode_version_get(struct inode *inode); bool ovl_is_whiteout(struct dentry *dentry); bool ovl_path_is_whiteout(struct ovl_fs *ofs, const struct path *path); struct file *ovl_path_open(const struct path *path, int flags); int ovl_copy_up_start(struct dentry *dentry, int flags); void ovl_copy_up_end(struct dentry *dentry); bool ovl_already_copied_up(struct dentry *dentry, int flags); bool ovl_path_check_dir_xattr(struct ovl_fs *ofs, const struct path *path, enum ovl_xattr ox); bool ovl_path_check_origin_xattr(struct ovl_fs *ofs, const struct path *path); bool ovl_path_check_xwhiteout_xattr(struct ovl_fs *ofs, const struct path *path); bool ovl_path_check_xwhiteouts_xattr(struct ovl_fs *ofs, const struct path *path); bool ovl_init_uuid_xattr(struct super_block *sb, struct ovl_fs *ofs, const struct path *upperpath); static inline bool ovl_upper_is_whiteout(struct ovl_fs *ofs, struct dentry *upperdentry) { struct path upperpath = { .dentry = upperdentry, .mnt = ovl_upper_mnt(ofs), }; return ovl_path_is_whiteout(ofs, &upperpath); } static inline bool ovl_check_origin_xattr(struct ovl_fs *ofs, struct dentry *upperdentry) { struct path upperpath = { .dentry = upperdentry, .mnt = ovl_upper_mnt(ofs), }; return ovl_path_check_origin_xattr(ofs, &upperpath); } int ovl_check_setxattr(struct ovl_fs *ofs, struct dentry *upperdentry, enum ovl_xattr ox, const void *value, size_t size, int xerr); int ovl_set_impure(struct dentry *dentry, struct dentry *upperdentry); bool ovl_inuse_trylock(struct dentry *dentry); void ovl_inuse_unlock(struct dentry *dentry); bool ovl_is_inuse(struct dentry *dentry); bool ovl_need_index(struct dentry *dentry); int ovl_nlink_start(struct dentry *dentry); void ovl_nlink_end(struct dentry *dentry); int ovl_lock_rename_workdir(struct dentry *workdir, struct dentry *upperdir); int ovl_check_metacopy_xattr(struct ovl_fs *ofs, const struct path *path, struct ovl_metacopy *data); int ovl_set_metacopy_xattr(struct ovl_fs *ofs, struct dentry *d, struct ovl_metacopy *metacopy); bool ovl_is_metacopy_dentry(struct dentry *dentry); char *ovl_get_redirect_xattr(struct ovl_fs *ofs, const struct path *path, int padding); int ovl_ensure_verity_loaded(struct path *path); int ovl_get_verity_xattr(struct ovl_fs *ofs, const struct path *path, u8 *digest_buf, int *buf_length); int ovl_validate_verity(struct ovl_fs *ofs, struct path *metapath, struct path *datapath); int ovl_get_verity_digest(struct ovl_fs *ofs, struct path *src, struct ovl_metacopy *metacopy); int ovl_sync_status(struct ovl_fs *ofs); static inline void ovl_set_flag(unsigned long flag, struct inode *inode) { set_bit(flag, &OVL_I(inode)->flags); } static inline void ovl_clear_flag(unsigned long flag, struct inode *inode) { clear_bit(flag, &OVL_I(inode)->flags); } static inline bool ovl_test_flag(unsigned long flag, struct inode *inode) { return test_bit(flag, &OVL_I(inode)->flags); } static inline bool ovl_is_impuredir(struct super_block *sb, struct dentry *upperdentry) { struct ovl_fs *ofs = OVL_FS(sb); struct path upperpath = { .dentry = upperdentry, .mnt = ovl_upper_mnt(ofs), }; return ovl_path_check_dir_xattr(ofs, &upperpath, OVL_XATTR_IMPURE); } static inline bool ovl_redirect_follow(struct ovl_fs *ofs) { return ofs->config.redirect_mode != OVL_REDIRECT_NOFOLLOW; } static inline bool ovl_redirect_dir(struct ovl_fs *ofs) { return ofs->config.redirect_mode == OVL_REDIRECT_ON; } static inline bool ovl_origin_uuid(struct ovl_fs *ofs) { return ofs->config.uuid != OVL_UUID_OFF; } static inline bool ovl_has_fsid(struct ovl_fs *ofs) { return ofs->config.uuid == OVL_UUID_ON || ofs->config.uuid == OVL_UUID_AUTO; } /* * With xino=auto, we do best effort to keep all inodes on same st_dev and * d_ino consistent with st_ino. * With xino=on, we do the same effort but we warn if we failed. */ static inline bool ovl_xino_warn(struct ovl_fs *ofs) { return ofs->config.xino == OVL_XINO_ON; } /* * To avoid regressions in existing setups with overlay lower offline changes, * we allow lower changes only if none of the new features are used. */ static inline bool ovl_allow_offline_changes(struct ovl_fs *ofs) { return (!ofs->config.index && !ofs->config.metacopy && !ovl_redirect_dir(ofs) && !ovl_xino_warn(ofs)); } /* All layers on same fs? */ static inline bool ovl_same_fs(struct ovl_fs *ofs) { return ofs->xino_mode == 0; } /* All overlay inodes have same st_dev? */ static inline bool ovl_same_dev(struct ovl_fs *ofs) { return ofs->xino_mode >= 0; } static inline unsigned int ovl_xino_bits(struct ovl_fs *ofs) { return ovl_same_dev(ofs) ? ofs->xino_mode : 0; } static inline void ovl_inode_lock(struct inode *inode) { mutex_lock(&OVL_I(inode)->lock); } static inline int ovl_inode_lock_interruptible(struct inode *inode) { return mutex_lock_interruptible(&OVL_I(inode)->lock); } static inline void ovl_inode_unlock(struct inode *inode) { mutex_unlock(&OVL_I(inode)->lock); } /* namei.c */ int ovl_check_fb_len(struct ovl_fb *fb, int fb_len); static inline int ovl_check_fh_len(struct ovl_fh *fh, int fh_len) { if (fh_len < sizeof(struct ovl_fh)) return -EINVAL; return ovl_check_fb_len(&fh->fb, fh_len - OVL_FH_WIRE_OFFSET); } struct dentry *ovl_decode_real_fh(struct ovl_fs *ofs, struct ovl_fh *fh, struct vfsmount *mnt, bool connected); int ovl_check_origin_fh(struct ovl_fs *ofs, struct ovl_fh *fh, bool connected, struct dentry *upperdentry, struct ovl_path **stackp); int ovl_verify_set_fh(struct ovl_fs *ofs, struct dentry *dentry, enum ovl_xattr ox, const struct ovl_fh *fh, bool is_upper, bool set); int ovl_verify_origin_xattr(struct ovl_fs *ofs, struct dentry *dentry, enum ovl_xattr ox, struct dentry *real, bool is_upper, bool set); struct dentry *ovl_index_upper(struct ovl_fs *ofs, struct dentry *index, bool connected); int ovl_verify_index(struct ovl_fs *ofs, struct dentry *index); int ovl_get_index_name_fh(const struct ovl_fh *fh, struct qstr *name); int ovl_get_index_name(struct ovl_fs *ofs, struct dentry *origin, struct qstr *name); struct dentry *ovl_get_index_fh(struct ovl_fs *ofs, struct ovl_fh *fh); struct dentry *ovl_lookup_index(struct ovl_fs *ofs, struct dentry *upper, struct dentry *origin, bool verify); int ovl_path_next(int idx, struct dentry *dentry, struct path *path); int ovl_verify_lowerdata(struct dentry *dentry); struct dentry *ovl_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags); bool ovl_lower_positive(struct dentry *dentry); static inline int ovl_verify_origin_fh(struct ovl_fs *ofs, struct dentry *upper, const struct ovl_fh *fh, bool set) { return ovl_verify_set_fh(ofs, upper, OVL_XATTR_ORIGIN, fh, false, set); } static inline int ovl_verify_origin(struct ovl_fs *ofs, struct dentry *upper, struct dentry *origin, bool set) { return ovl_verify_origin_xattr(ofs, upper, OVL_XATTR_ORIGIN, origin, false, set); } static inline int ovl_verify_upper(struct ovl_fs *ofs, struct dentry *index, struct dentry *upper, bool set) { return ovl_verify_origin_xattr(ofs, index, OVL_XATTR_UPPER, upper, true, set); } /* readdir.c */ extern const struct file_operations ovl_dir_operations; struct file *ovl_dir_real_file(const struct file *file, bool want_upper); int ovl_check_empty_dir(struct dentry *dentry, struct list_head *list); void ovl_cleanup_whiteouts(struct ovl_fs *ofs, struct dentry *upper, struct list_head *list); void ovl_cache_free(struct list_head *list); void ovl_dir_cache_free(struct inode *inode); int ovl_check_d_type_supported(const struct path *realpath); int ovl_workdir_cleanup(struct ovl_fs *ofs, struct inode *dir, struct vfsmount *mnt, struct dentry *dentry, int level); int ovl_indexdir_cleanup(struct ovl_fs *ofs); /* * Can we iterate real dir directly? * * Non-merge dir may contain whiteouts from a time it was a merge upper, before * lower dir was removed under it and possibly before it was rotated from upper * to lower layer. */ static inline bool ovl_dir_is_real(struct inode *dir) { return !ovl_test_flag(OVL_WHITEOUTS, dir); } /* inode.c */ int ovl_set_nlink_upper(struct dentry *dentry); int ovl_set_nlink_lower(struct dentry *dentry); unsigned int ovl_get_nlink(struct ovl_fs *ofs, struct dentry *lowerdentry, struct dentry *upperdentry, unsigned int fallback); int ovl_permission(struct mnt_idmap *idmap, struct inode *inode, int mask); #ifdef CONFIG_FS_POSIX_ACL struct posix_acl *do_ovl_get_acl(struct mnt_idmap *idmap, struct inode *inode, int type, bool rcu, bool noperm); static inline struct posix_acl *ovl_get_inode_acl(struct inode *inode, int type, bool rcu) { return do_ovl_get_acl(&nop_mnt_idmap, inode, type, rcu, true); } static inline struct posix_acl *ovl_get_acl(struct mnt_idmap *idmap, struct dentry *dentry, int type) { return do_ovl_get_acl(idmap, d_inode(dentry), type, false, false); } int ovl_set_acl(struct mnt_idmap *idmap, struct dentry *dentry, struct posix_acl *acl, int type); struct posix_acl *ovl_get_acl_path(const struct path *path, const char *acl_name, bool noperm); #else #define ovl_get_inode_acl NULL #define ovl_get_acl NULL #define ovl_set_acl NULL static inline struct posix_acl *ovl_get_acl_path(const struct path *path, const char *acl_name, bool noperm) { return NULL; } #endif int ovl_update_time(struct inode *inode, int flags); bool ovl_is_private_xattr(struct super_block *sb, const char *name); struct ovl_inode_params { struct inode *newinode; struct dentry *upperdentry; struct ovl_entry *oe; bool index; char *redirect; char *lowerdata_redirect; }; void ovl_inode_init(struct inode *inode, struct ovl_inode_params *oip, unsigned long ino, int fsid); struct inode *ovl_new_inode(struct super_block *sb, umode_t mode, dev_t rdev); struct inode *ovl_lookup_inode(struct super_block *sb, struct dentry *real, bool is_upper); bool ovl_lookup_trap_inode(struct super_block *sb, struct dentry *dir); struct inode *ovl_get_trap_inode(struct super_block *sb, struct dentry *dir); struct inode *ovl_get_inode(struct super_block *sb, struct ovl_inode_params *oip); void ovl_copyattr(struct inode *to); /* vfs inode flags copied from real to ovl inode */ #define OVL_COPY_I_FLAGS_MASK (S_SYNC | S_NOATIME | S_APPEND | S_IMMUTABLE) /* vfs inode flags read from overlay.protattr xattr to ovl inode */ #define OVL_PROT_I_FLAGS_MASK (S_APPEND | S_IMMUTABLE) /* * fileattr flags copied from lower to upper inode on copy up. * We cannot copy up immutable/append-only flags, because that would prevent * linking temp inode to upper dir, so we store them in xattr instead. */ #define OVL_COPY_FS_FLAGS_MASK (FS_SYNC_FL | FS_NOATIME_FL) #define OVL_COPY_FSX_FLAGS_MASK (FS_XFLAG_SYNC | FS_XFLAG_NOATIME) #define OVL_PROT_FS_FLAGS_MASK (FS_APPEND_FL | FS_IMMUTABLE_FL) #define OVL_PROT_FSX_FLAGS_MASK (FS_XFLAG_APPEND | FS_XFLAG_IMMUTABLE) void ovl_check_protattr(struct inode *inode, struct dentry *upper); int ovl_set_protattr(struct inode *inode, struct dentry *upper, struct fileattr *fa); static inline void ovl_copyflags(struct inode *from, struct inode *to) { unsigned int mask = OVL_COPY_I_FLAGS_MASK; inode_set_flags(to, from->i_flags & mask, mask); } /* dir.c */ extern const struct inode_operations ovl_dir_inode_operations; int ovl_cleanup_and_whiteout(struct ovl_fs *ofs, struct inode *dir, struct dentry *dentry); struct ovl_cattr { dev_t rdev; umode_t mode; const char *link; struct dentry *hardlink; }; #define OVL_CATTR(m) (&(struct ovl_cattr) { .mode = (m) }) int ovl_mkdir_real(struct ovl_fs *ofs, struct inode *dir, struct dentry **newdentry, umode_t mode); struct dentry *ovl_create_real(struct ovl_fs *ofs, struct inode *dir, struct dentry *newdentry, struct ovl_cattr *attr); int ovl_cleanup(struct ovl_fs *ofs, struct inode *dir, struct dentry *dentry); struct dentry *ovl_lookup_temp(struct ovl_fs *ofs, struct dentry *workdir); struct dentry *ovl_create_temp(struct ovl_fs *ofs, struct dentry *workdir, struct ovl_cattr *attr); /* file.c */ extern const struct file_operations ovl_file_operations; int __init ovl_aio_request_cache_init(void); void ovl_aio_request_cache_destroy(void); int ovl_real_fileattr_get(const struct path *realpath, struct fileattr *fa); int ovl_real_fileattr_set(const struct path *realpath, struct fileattr *fa); int ovl_fileattr_get(struct dentry *dentry, struct fileattr *fa); int ovl_fileattr_set(struct mnt_idmap *idmap, struct dentry *dentry, struct fileattr *fa); /* copy_up.c */ int ovl_copy_up(struct dentry *dentry); int ovl_copy_up_with_data(struct dentry *dentry); int ovl_maybe_copy_up(struct dentry *dentry, int flags); int ovl_copy_xattr(struct super_block *sb, const struct path *path, struct dentry *new); int ovl_set_attr(struct ovl_fs *ofs, struct dentry *upper, struct kstat *stat); struct ovl_fh *ovl_encode_real_fh(struct ovl_fs *ofs, struct dentry *real, bool is_upper); struct ovl_fh *ovl_get_origin_fh(struct ovl_fs *ofs, struct dentry *origin); int ovl_set_origin_fh(struct ovl_fs *ofs, const struct ovl_fh *fh, struct dentry *upper); /* export.c */ extern const struct export_operations ovl_export_operations; extern const struct export_operations ovl_export_fid_operations; /* super.c */ int ovl_fill_super(struct super_block *sb, struct fs_context *fc); /* Will this overlay be forced to mount/remount ro? */ static inline bool ovl_force_readonly(struct ovl_fs *ofs) { return (!ovl_upper_mnt(ofs) || !ofs->workdir); } /* xattr.c */ const struct xattr_handler * const *ovl_xattr_handlers(struct ovl_fs *ofs); int ovl_setattr(struct mnt_idmap *idmap, struct dentry *dentry, struct iattr *attr); int ovl_getattr(struct mnt_idmap *idmap, const struct path *path, struct kstat *stat, u32 request_mask, unsigned int flags); ssize_t ovl_listxattr(struct dentry *dentry, char *list, size_t size);
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