Miklos Szeredi | e9be9d5 | 2014-10-24 00:14:38 +0200 | [diff] [blame^] | 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); |