1/* 2 * 3 * Copyright (C) 2011 Novell Inc. 4 * 5 * This program is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 as published by 7 * the Free Software Foundation. 8 */ 9 10#include <linux/kernel.h> 11 12struct ovl_entry; 13 14enum ovl_path_type { 15 __OVL_PATH_PURE = (1 << 0), 16 __OVL_PATH_UPPER = (1 << 1), 17 __OVL_PATH_MERGE = (1 << 2), 18}; 19 20#define OVL_TYPE_UPPER(type) ((type) & __OVL_PATH_UPPER) 21#define OVL_TYPE_MERGE(type) ((type) & __OVL_PATH_MERGE) 22#define OVL_TYPE_PURE_UPPER(type) ((type) & __OVL_PATH_PURE) 23#define OVL_TYPE_MERGE_OR_LOWER(type) \ 24 (OVL_TYPE_MERGE(type) || !OVL_TYPE_UPPER(type)) 25 26#define OVL_XATTR_PRE_NAME "trusted.overlay." 27#define OVL_XATTR_PRE_LEN 16 28#define OVL_XATTR_OPAQUE OVL_XATTR_PRE_NAME"opaque" 29 30static inline int ovl_do_rmdir(struct inode *dir, struct dentry *dentry) 31{ 32 int err = vfs_rmdir(dir, dentry); 33 pr_debug("rmdir(%pd2) = %i\n", dentry, err); 34 return err; 35} 36 37static inline int ovl_do_unlink(struct inode *dir, struct dentry *dentry) 38{ 39 int err = vfs_unlink(dir, dentry, NULL); 40 pr_debug("unlink(%pd2) = %i\n", dentry, err); 41 return err; 42} 43 44static inline int ovl_do_link(struct dentry *old_dentry, struct inode *dir, 45 struct dentry *new_dentry, bool debug) 46{ 47 int err = vfs_link(old_dentry, dir, new_dentry, NULL); 48 if (debug) { 49 pr_debug("link(%pd2, %pd2) = %i\n", 50 old_dentry, new_dentry, err); 51 } 52 return err; 53} 54 55static inline int ovl_do_create(struct inode *dir, struct dentry *dentry, 56 umode_t mode, bool debug) 57{ 58 int err = vfs_create(dir, dentry, mode, true); 59 if (debug) 60 pr_debug("create(%pd2, 0%o) = %i\n", dentry, mode, err); 61 return err; 62} 63 64static inline int ovl_do_mkdir(struct inode *dir, struct dentry *dentry, 65 umode_t mode, bool debug) 66{ 67 int err = vfs_mkdir(dir, dentry, mode); 68 if (debug) 69 pr_debug("mkdir(%pd2, 0%o) = %i\n", dentry, mode, err); 70 return err; 71} 72 73static inline int ovl_do_mknod(struct inode *dir, struct dentry *dentry, 74 umode_t mode, dev_t dev, bool debug) 75{ 76 int err = vfs_mknod(dir, dentry, mode, dev); 77 if (debug) { 78 pr_debug("mknod(%pd2, 0%o, 0%o) = %i\n", 79 dentry, mode, dev, err); 80 } 81 return err; 82} 83 84static inline int ovl_do_symlink(struct inode *dir, struct dentry *dentry, 85 const char *oldname, bool debug) 86{ 87 int err = vfs_symlink(dir, dentry, oldname); 88 if (debug) 89 pr_debug("symlink(\"%s\", %pd2) = %i\n", oldname, dentry, err); 90 return err; 91} 92 93static inline int ovl_do_setxattr(struct dentry *dentry, const char *name, 94 const void *value, size_t size, int flags) 95{ 96 int err = vfs_setxattr(dentry, name, value, size, flags); 97 pr_debug("setxattr(%pd2, \"%s\", \"%*s\", 0x%x) = %i\n", 98 dentry, name, (int) size, (char *) value, flags, err); 99 return err; 100} 101 102static inline int ovl_do_removexattr(struct dentry *dentry, const char *name) 103{ 104 int err = vfs_removexattr(dentry, name); 105 pr_debug("removexattr(%pd2, \"%s\") = %i\n", dentry, name, err); 106 return err; 107} 108 109static inline int ovl_do_rename(struct inode *olddir, struct dentry *olddentry, 110 struct inode *newdir, struct dentry *newdentry, 111 unsigned int flags) 112{ 113 int err; 114 115 pr_debug("rename2(%pd2, %pd2, 0x%x)\n", 116 olddentry, newdentry, flags); 117 118 err = vfs_rename(olddir, olddentry, newdir, newdentry, NULL, flags); 119 120 if (err) { 121 pr_debug("...rename2(%pd2, %pd2, ...) = %i\n", 122 olddentry, newdentry, err); 123 } 124 return err; 125} 126 127static inline int ovl_do_whiteout(struct inode *dir, struct dentry *dentry) 128{ 129 int err = vfs_whiteout(dir, dentry); 130 pr_debug("whiteout(%pd2) = %i\n", dentry, err); 131 return err; 132} 133 134enum ovl_path_type ovl_path_type(struct dentry *dentry); 135u64 ovl_dentry_version_get(struct dentry *dentry); 136void ovl_dentry_version_inc(struct dentry *dentry); 137void ovl_path_upper(struct dentry *dentry, struct path *path); 138void ovl_path_lower(struct dentry *dentry, struct path *path); 139enum ovl_path_type ovl_path_real(struct dentry *dentry, struct path *path); 140int ovl_path_next(int idx, struct dentry *dentry, struct path *path); 141struct dentry *ovl_dentry_upper(struct dentry *dentry); 142struct dentry *ovl_dentry_lower(struct dentry *dentry); 143struct dentry *ovl_dentry_real(struct dentry *dentry); 144struct dentry *ovl_entry_real(struct ovl_entry *oe, bool *is_upper); 145struct ovl_dir_cache *ovl_dir_cache(struct dentry *dentry); 146void ovl_set_dir_cache(struct dentry *dentry, struct ovl_dir_cache *cache); 147struct dentry *ovl_workdir(struct dentry *dentry); 148int ovl_want_write(struct dentry *dentry); 149void ovl_drop_write(struct dentry *dentry); 150bool ovl_dentry_is_opaque(struct dentry *dentry); 151void ovl_dentry_set_opaque(struct dentry *dentry, bool opaque); 152bool ovl_is_whiteout(struct dentry *dentry); 153void ovl_dentry_update(struct dentry *dentry, struct dentry *upperdentry); 154struct dentry *ovl_lookup(struct inode *dir, struct dentry *dentry, 155 unsigned int flags); 156struct file *ovl_path_open(struct path *path, int flags); 157 158struct dentry *ovl_upper_create(struct dentry *upperdir, struct dentry *dentry, 159 struct kstat *stat, const char *link); 160 161/* readdir.c */ 162extern const struct file_operations ovl_dir_operations; 163int ovl_check_empty_dir(struct dentry *dentry, struct list_head *list); 164void ovl_cleanup_whiteouts(struct dentry *upper, struct list_head *list); 165void ovl_cache_free(struct list_head *list); 166 167/* inode.c */ 168int ovl_setattr(struct dentry *dentry, struct iattr *attr); 169int ovl_permission(struct inode *inode, int mask); 170int ovl_setxattr(struct dentry *dentry, const char *name, 171 const void *value, size_t size, int flags); 172ssize_t ovl_getxattr(struct dentry *dentry, const char *name, 173 void *value, size_t size); 174ssize_t ovl_listxattr(struct dentry *dentry, char *list, size_t size); 175int ovl_removexattr(struct dentry *dentry, const char *name); 176struct inode *ovl_d_select_inode(struct dentry *dentry, unsigned file_flags); 177 178struct inode *ovl_new_inode(struct super_block *sb, umode_t mode, 179 struct ovl_entry *oe); 180static inline void ovl_copyattr(struct inode *from, struct inode *to) 181{ 182 to->i_uid = from->i_uid; 183 to->i_gid = from->i_gid; 184} 185 186/* dir.c */ 187extern const struct inode_operations ovl_dir_inode_operations; 188struct dentry *ovl_lookup_temp(struct dentry *workdir, struct dentry *dentry); 189int ovl_create_real(struct inode *dir, struct dentry *newdentry, 190 struct kstat *stat, const char *link, 191 struct dentry *hardlink, bool debug); 192void ovl_cleanup(struct inode *dir, struct dentry *dentry); 193 194/* copy_up.c */ 195int ovl_copy_up(struct dentry *dentry); 196int ovl_copy_up_one(struct dentry *parent, struct dentry *dentry, 197 struct path *lowerpath, struct kstat *stat, 198 struct iattr *attr); 199int ovl_copy_xattr(struct dentry *old, struct dentry *new); 200int ovl_set_attr(struct dentry *upper, struct kstat *stat); 201