include/os/linux/zfs/sys/zpl.h

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or https://opensource.org/licenses/CDDL-1.0.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 /*
  22  * Copyright (c) 2011, Lawrence Livermore National Security, LLC.
  23  */
  24
  25 #ifndef _SYS_ZPL_H
  26 #define _SYS_ZPL_H
  27
  28 #include <sys/mntent.h>
  29 #include <sys/vfs.h>
  30 #include <linux/aio.h>
  31 #include <linux/dcache_compat.h>
  32 #include <linux/exportfs.h>
  33 #include <linux/falloc.h>
  34 #include <linux/parser.h>
  35 #include <linux/task_io_accounting_ops.h>
  36 #include <linux/vfs_compat.h>
  37 #include <linux/writeback.h>
  38 #include <linux/xattr_compat.h>
  39
  40 /* zpl_inode.c */
  41 extern void zpl_vap_init(vattr_t *vap, struct inode *dir,
  42     umode_t mode, cred_t *cr, zuserns_t *mnt_ns);
  43
  44 extern const struct inode_operations zpl_inode_operations;
  45 #ifdef HAVE_RENAME2_OPERATIONS_WRAPPER
  46 extern const struct inode_operations_wrapper zpl_dir_inode_operations;
  47 #else
  48 extern const struct inode_operations zpl_dir_inode_operations;
  49 #endif
  50 extern const struct inode_operations zpl_symlink_inode_operations;
  51 extern const struct inode_operations zpl_special_inode_operations;
  52
  53 /* zpl_file.c */
  54 extern const struct address_space_operations zpl_address_space_operations;
  55 extern const struct file_operations zpl_file_operations;
  56 extern const struct file_operations zpl_dir_file_operations;
  57
  58 /* zpl_super.c */
  59 extern void zpl_prune_sb(int64_t nr_to_scan, void *arg);
  60
  61 extern const struct super_operations zpl_super_operations;
  62 extern const struct export_operations zpl_export_operations;
  63 extern struct file_system_type zpl_fs_type;
  64
  65 /* zpl_xattr.c */
  66 extern ssize_t zpl_xattr_list(struct dentry *dentry, char *buf, size_t size);
  67 extern int zpl_xattr_security_init(struct inode *ip, struct inode *dip,
  68     const struct qstr *qstr);
  69 #if defined(CONFIG_FS_POSIX_ACL)
  70 #if defined(HAVE_SET_ACL)
  71 #if defined(HAVE_SET_ACL_USERNS)
  72 extern int zpl_set_acl(struct user_namespace *userns, struct inode *ip,
  73     struct posix_acl *acl, int type);
  74 #else
  75 extern int zpl_set_acl(struct inode *ip, struct posix_acl *acl, int type);
  76 #endif /* HAVE_SET_ACL_USERNS */
  77 #endif /* HAVE_SET_ACL */
  78 #if defined(HAVE_GET_ACL_RCU) || defined(HAVE_GET_INODE_ACL)
  79 extern struct posix_acl *zpl_get_acl(struct inode *ip, int type, bool rcu);
  80 #elif defined(HAVE_GET_ACL)
  81 extern struct posix_acl *zpl_get_acl(struct inode *ip, int type);
  82 #endif
  83 extern int zpl_init_acl(struct inode *ip, struct inode *dir);
  84 extern int zpl_chmod_acl(struct inode *ip);
  85 #else
  86 static inline int
  87 zpl_init_acl(struct inode *ip, struct inode *dir)
  88 {
  89         return (0);
  90 }
  91
  92 static inline int
  93 zpl_chmod_acl(struct inode *ip)
  94 {
  95         return (0);
  96 }
  97 #endif /* CONFIG_FS_POSIX_ACL */
  98
  99 extern xattr_handler_t *zpl_xattr_handlers[];
 100
 101 /* zpl_ctldir.c */
 102 extern const struct file_operations zpl_fops_root;
 103 extern const struct inode_operations zpl_ops_root;
 104
 105 extern const struct file_operations zpl_fops_snapdir;
 106 extern const struct inode_operations zpl_ops_snapdir;
 107
 108 extern const struct file_operations zpl_fops_shares;
 109 extern const struct inode_operations zpl_ops_shares;
 110
 111 #if defined(HAVE_VFS_ITERATE) || defined(HAVE_VFS_ITERATE_SHARED)
 112
 113 #define ZPL_DIR_CONTEXT_INIT(_dirent, _actor, _pos) {   \
 114         .actor = _actor,                                \
 115         .pos = _pos,                                    \
 116 }
 117
 118 typedef struct dir_context zpl_dir_context_t;
 119
 120 #define zpl_dir_emit            dir_emit
 121 #define zpl_dir_emit_dot        dir_emit_dot
 122 #define zpl_dir_emit_dotdot     dir_emit_dotdot
 123 #define zpl_dir_emit_dots       dir_emit_dots
 124
 125 #else
 126
 127 typedef struct zpl_dir_context {
 128         void *dirent;
 129         const filldir_t actor;
 130         loff_t pos;
 131 } zpl_dir_context_t;
 132
 133 #define ZPL_DIR_CONTEXT_INIT(_dirent, _actor, _pos) {   \
 134         .dirent = _dirent,                              \
 135         .actor = _actor,                                \
 136         .pos = _pos,                                    \
 137 }
 138
 139 static inline bool
 140 zpl_dir_emit(zpl_dir_context_t *ctx, const char *name, int namelen,
 141     uint64_t ino, unsigned type)
 142 {
 143         return (!ctx->actor(ctx->dirent, name, namelen, ctx->pos, ino, type));
 144 }
 145
 146 static inline bool
 147 zpl_dir_emit_dot(struct file *file, zpl_dir_context_t *ctx)
 148 {
 149         return (ctx->actor(ctx->dirent, ".", 1, ctx->pos,
 150             file_inode(file)->i_ino, DT_DIR) == 0);
 151 }
 152
 153 static inline bool
 154 zpl_dir_emit_dotdot(struct file *file, zpl_dir_context_t *ctx)
 155 {
 156         return (ctx->actor(ctx->dirent, "..", 2, ctx->pos,
 157             parent_ino(file_dentry(file)), DT_DIR) == 0);
 158 }
 159
 160 static inline bool
 161 zpl_dir_emit_dots(struct file *file, zpl_dir_context_t *ctx)
 162 {
 163         if (ctx->pos == 0) {
 164                 if (!zpl_dir_emit_dot(file, ctx))
 165                         return (false);
 166                 ctx->pos = 1;
 167         }
 168         if (ctx->pos == 1) {
 169                 if (!zpl_dir_emit_dotdot(file, ctx))
 170                         return (false);
 171                 ctx->pos = 2;
 172         }
 173         return (true);
 174 }
 175 #endif /* HAVE_VFS_ITERATE */
 176
 177 #if defined(HAVE_INODE_TIMESTAMP_TRUNCATE)
 178 #define zpl_inode_timestamp_truncate(ts, ip)    timestamp_truncate(ts, ip)
 179 #elif defined(HAVE_INODE_TIMESPEC64_TIMES)
 180 #define zpl_inode_timestamp_truncate(ts, ip)    \
 181         timespec64_trunc(ts, (ip)->i_sb->s_time_gran)
 182 #else
 183 #define zpl_inode_timestamp_truncate(ts, ip)    \
 184         timespec_trunc(ts, (ip)->i_sb->s_time_gran)
 185 #endif
 186
 187 #if defined(HAVE_INODE_OWNER_OR_CAPABLE)
 188 #define zpl_inode_owner_or_capable(ns, ip)      inode_owner_or_capable(ip)
 189 #elif defined(HAVE_INODE_OWNER_OR_CAPABLE_IDMAPPED)
 190 #define zpl_inode_owner_or_capable(ns, ip)      inode_owner_or_capable(ns, ip)
 191 #else
 192 #error "Unsupported kernel"
 193 #endif
 194
 195 #ifdef HAVE_SETATTR_PREPARE_USERNS
 196 #define zpl_setattr_prepare(ns, dentry, ia)     setattr_prepare(ns, dentry, ia)
 197 #else
 198 /*
 199  * Use kernel-provided version, or our own from
 200  * linux/vfs_compat.h
 201  */
 202 #define zpl_setattr_prepare(ns, dentry, ia)     setattr_prepare(dentry, ia)
 203 #endif
 204
 205 #endif  /* _SYS_ZPL_H */