include/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 http://www.opensolaris.org/os/licensing.
  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/vfs.h>
  29 #include <linux/vfs_compat.h>
  30 #include <linux/xattr_compat.h>
  31 #include <linux/dcache_compat.h>
  32 #include <linux/exportfs.h>
  33 #include <linux/writeback.h>
  34 #include <linux/falloc.h>
  35
  36 /* zpl_inode.c */
  37 extern void zpl_vap_init(vattr_t *vap, struct inode *dir,
  38     zpl_umode_t mode, cred_t *cr);
  39
  40 extern const struct inode_operations zpl_inode_operations;
  41 extern const struct inode_operations zpl_dir_inode_operations;
  42 extern const struct inode_operations zpl_symlink_inode_operations;
  43 extern const struct inode_operations zpl_special_inode_operations;
  44 extern dentry_operations_t zpl_dentry_operations;
  45
  46 /* zpl_file.c */
  47 extern ssize_t zpl_read_common(struct inode *ip, const char *buf,
  48     size_t len, loff_t pos, uio_seg_t segment, int flags, cred_t *cr);
  49 extern ssize_t zpl_write_common(struct inode *ip, const char *buf,
  50     size_t len, loff_t pos, uio_seg_t segment, int flags, cred_t *cr);
  51 extern long zpl_fallocate_common(struct inode *ip, int mode,
  52     loff_t offset, loff_t len);
  53
  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_sbs(int64_t bytes_to_scan, void *private);
  60
  61 typedef struct zpl_mount_data {
  62         const char *z_osname;   /* Dataset name */
  63         void *z_data;           /* Mount options string */
  64 } zpl_mount_data_t;
  65
  66 extern const struct super_operations zpl_super_operations;
  67 extern const struct export_operations zpl_export_operations;
  68 extern struct file_system_type zpl_fs_type;
  69
  70 /* zpl_xattr.c */
  71 extern ssize_t zpl_xattr_list(struct dentry *dentry, char *buf, size_t size);
  72 extern int zpl_xattr_security_init(struct inode *ip, struct inode *dip,
  73     const struct qstr *qstr);
  74
  75 extern xattr_handler_t *zpl_xattr_handlers[];
  76
  77 /* zpl_ctldir.c */
  78 extern const struct file_operations zpl_fops_root;
  79 extern const struct inode_operations zpl_ops_root;
  80
  81 extern const struct file_operations zpl_fops_snapdir;
  82 extern const struct inode_operations zpl_ops_snapdir;
  83 #ifdef HAVE_AUTOMOUNT
  84 extern const struct dentry_operations zpl_dops_snapdirs;
  85 #else
  86 extern const struct inode_operations zpl_ops_snapdirs;
  87 #endif /* HAVE_AUTOMOUNT */
  88
  89 extern const struct file_operations zpl_fops_shares;
  90 extern const struct inode_operations zpl_ops_shares;
  91
  92 #ifdef HAVE_VFS_ITERATE
  93
  94 #define DIR_CONTEXT_INIT(_dirent, _actor, _pos) {       \
  95         .actor = _actor,                                \
  96         .pos = _pos,                                    \
  97 }
  98
  99 #else
 100
 101 typedef struct dir_context {
 102         void *dirent;
 103         const filldir_t actor;
 104         loff_t pos;
 105 } dir_context_t;
 106
 107 #define DIR_CONTEXT_INIT(_dirent, _actor, _pos) {       \
 108         .dirent = _dirent,                              \
 109         .actor = _actor,                                \
 110         .pos = _pos,                                    \
 111 }
 112
 113 static inline bool
 114 dir_emit(struct dir_context *ctx, const char *name, int namelen,
 115     uint64_t ino, unsigned type)
 116 {
 117         return ctx->actor(ctx->dirent, name, namelen, ctx->pos, ino, type) == 0;
 118 }
 119
 120 static inline bool
 121 dir_emit_dot(struct file *file, struct dir_context *ctx)
 122 {
 123         return ctx->actor(ctx->dirent, ".", 1, ctx->pos,
 124             file->f_path.dentry->d_inode->i_ino, DT_DIR) == 0;
 125 }
 126
 127 static inline bool
 128 dir_emit_dotdot(struct file *file, struct dir_context *ctx)
 129 {
 130         return ctx->actor(ctx->dirent, "..", 2, ctx->pos,
 131             parent_ino(file->f_path.dentry), DT_DIR) == 0;
 132 }
 133
 134 static inline bool
 135 dir_emit_dots(struct file *file, struct dir_context *ctx)
 136 {
 137         if (ctx->pos == 0) {
 138                 if (!dir_emit_dot(file, ctx))
 139                         return false;
 140                 ctx->pos = 1;
 141         }
 142         if (ctx->pos == 1) {
 143                 if (!dir_emit_dotdot(file, ctx))
 144                         return false;
 145                 ctx->pos = 2;
 146         }
 147         return true;
 148 }
 149 #endif /* HAVE_VFS_ITERATE */
 150
 151 #endif  /* _SYS_ZPL_H */