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