4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
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10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
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13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see
18 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
20 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
21 * CA 95054 USA or visit www.sun.com if you need additional information or
27 * Copyright (c) 2009, 2010, Oracle and/or its affiliates. All rights reserved.
28 * Use is subject to license terms.
30 * Copyright (c) 2012, Intel Corporation.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
36 * API and structure definitions for params_tree.
38 * Author: LiuYing <emoly.liu@oracle.com>
40 #ifndef __PARAMS_TREE_H__
41 #define __PARAMS_TREE_H__
43 #include <libcfs/libcfs.h>
46 #if (defined(__KERNEL__) && defined(CONFIG_PROC_FS))
51 typedef struct file cfs_param_file_t;
52 typedef struct inode cfs_inode_t;
53 typedef struct proc_inode cfs_proc_inode_t;
54 typedef struct seq_file cfs_seq_file_t;
55 typedef struct seq_operations cfs_seq_ops_t;
56 typedef struct file_operations cfs_param_file_ops_t;
57 typedef cfs_module_t *cfs_param_module_t;
58 typedef struct proc_dir_entry cfs_param_dentry_t;
59 typedef struct poll_table_struct cfs_poll_table_t;
60 #define CFS_PARAM_MODULE THIS_MODULE
61 #define CFS_PDE(value) PDE(value)
62 #define cfs_file_private(file) (file->private_data)
63 #define cfs_dentry_data(dentry) (dentry->data)
64 #define cfs_proc_inode_pde(proc_inode) (proc_inode->pde)
65 #define cfs_proc_inode(proc_inode) (proc_inode->vfs_inode)
66 #define cfs_seq_read_common seq_read
67 #define cfs_seq_lseek_common seq_lseek
68 #define cfs_seq_private(seq) (seq->private)
69 #define cfs_seq_printf(seq, format, ...) seq_printf(seq, format, \
71 #define cfs_seq_release(inode, file) seq_release(inode, file)
72 #define cfs_seq_puts(seq, s) seq_puts(seq, s)
73 #define cfs_seq_putc(seq, s) seq_putc(seq, s)
74 #define cfs_seq_read(file, buf, count, ppos, rc) (rc = seq_read(file, buf, \
76 #define cfs_seq_open(file, ops, rc) (rc = seq_open(file, ops))
78 /* in lprocfs_stat.c, to protect the private data for proc entries */
79 extern struct rw_semaphore _lprocfs_lock;
81 /* to begin from 2.6.23, Linux defines self file_operations (proc_reg_file_ops)
82 * in procfs, the proc file_operation defined by Lustre (lprocfs_generic_fops)
83 * will be wrapped into the new defined proc_reg_file_ops, which instroduces
84 * user count in proc_dir_entrey(pde_users) to protect the proc entry from
85 * being deleted. then the protection lock (_lprocfs_lock) defined by Lustre
86 * isn't necessary anymore for lprocfs_generic_fops(e.g. lprocfs_fops_read).
87 * see bug19706 for detailed information.
89 #ifndef HAVE_PROCFS_USERS
91 #define LPROCFS_ENTRY() \
93 down_read(&_lprocfs_lock); \
96 #define LPROCFS_EXIT() \
98 up_read(&_lprocfs_lock); \
102 #define LPROCFS_ENTRY() do{ }while(0)
103 #define LPROCFS_EXIT() do{ }while(0)
106 #ifdef HAVE_PROCFS_DELETED
109 int LPROCFS_ENTRY_AND_CHECK(struct proc_dir_entry *dp)
118 #elif defined(HAVE_PROCFS_USERS) /* !HAVE_PROCFS_DELETED*/
120 int LPROCFS_ENTRY_AND_CHECK(struct proc_dir_entry *dp)
124 spin_lock(&(dp)->pde_unload_lock);
125 if (dp->proc_fops == NULL)
127 spin_unlock(&(dp)->pde_unload_lock);
132 #else /* !HAVE_PROCFS_DELETED*/
134 int LPROCFS_ENTRY_AND_CHECK(struct proc_dir_entry *dp)
139 #endif /* HAVE_PROCFS_DELETED */
140 #define LPROCFS_SRCH_ENTRY() \
142 down_read(&_lprocfs_lock); \
145 #define LPROCFS_SRCH_EXIT() \
147 up_read(&_lprocfs_lock); \
150 #define LPROCFS_WRITE_ENTRY() \
152 down_write(&_lprocfs_lock); \
155 #define LPROCFS_WRITE_EXIT() \
157 up_write(&_lprocfs_lock); \
161 typedef struct cfs_params_file {
164 unsigned int param_flags;
167 typedef struct cfs_param_inode {
171 typedef struct cfs_param_dentry {
173 } cfs_param_dentry_t;
175 typedef struct cfs_proc_inode {
176 cfs_param_dentry_t *param_pde;
177 cfs_inode_t param_inode;
180 struct cfs_seq_operations;
181 typedef struct cfs_seq_file {
189 struct cfs_seq_operations *op;
193 typedef struct cfs_seq_operations {
194 void *(*start) (cfs_seq_file_t *m, loff_t *pos);
195 void (*stop) (cfs_seq_file_t *m, void *v);
196 void *(*next) (cfs_seq_file_t *m, void *v, loff_t *pos);
197 int (*show) (cfs_seq_file_t *m, void *v);
200 typedef void *cfs_param_module_t;
201 typedef void *cfs_poll_table_t;
203 typedef struct cfs_param_file_ops {
204 cfs_param_module_t owner;
205 int (*open) (cfs_inode_t *, cfs_file_t *);
206 loff_t (*llseek)(cfs_file_t *, loff_t, int);
207 int (*release) (cfs_inode_t *, cfs_param_file_t *);
208 unsigned int (*poll) (cfs_file_t *, cfs_poll_table_t *);
209 ssize_t (*write) (cfs_file_t *, const char *, size_t, loff_t *);
210 ssize_t (*read)(cfs_file_t *, char *, size_t, loff_t *);
211 } cfs_param_file_ops_t;
212 typedef cfs_param_file_ops_t *cfs_lproc_filep_t;
214 static inline cfs_proc_inode_t *FAKE_PROC_I(const cfs_inode_t *inode)
216 return container_of(inode, cfs_proc_inode_t, param_inode);
219 static inline cfs_param_dentry_t *FAKE_PDE(cfs_inode_t *inode)
221 return FAKE_PROC_I(inode)->param_pde;
224 #define CFS_PARAM_MODULE NULL
225 #define CFS_PDE(value) FAKE_PDE(value)
226 #define cfs_file_private(file) (file->param_private)
227 #define cfs_dentry_data(dentry) (dentry->param_data)
228 #define cfs_proc_inode(proc_inode) (proc_inode->param_inode)
229 #define cfs_proc_inode_pde(proc_inode) (proc_inode->param_pde)
230 #define cfs_seq_read_common NULL
231 #define cfs_seq_lseek_common NULL
232 #define cfs_seq_private(seq) (seq->private)
233 #define cfs_seq_read(file, buf, count, ppos, rc) do {} while(0)
234 #define cfs_seq_open(file, ops, rc) \
236 cfs_seq_file_t *p = cfs_file_private(file); \
238 LIBCFS_ALLOC(p, sizeof(*p)); \
243 cfs_file_private(file) = p; \
245 memset(p, 0, sizeof(*p)); \
250 #define LPROCFS_ENTRY() do {} while(0)
251 #define LPROCFS_EXIT() do {} while(0)
253 int LPROCFS_ENTRY_AND_CHECK(cfs_param_dentry_t *dp)
258 #define LPROCFS_WRITE_ENTRY() do {} while(0)
259 #define LPROCFS_WRITE_EXIT() do {} while(0)
263 /* XXX: params_tree APIs */
265 #endif /* __PARAMS_TREE_H__ */