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34 * API and structure definitions for params_tree.
36 * Author: LiuYing <emoly.liu@oracle.com>
38 #ifndef __PARAMS_TREE_H__
39 #define __PARAMS_TREE_H__
41 #include <libcfs/libcfs.h>
44 #if (defined(__KERNEL__) && defined(CONFIG_PROC_FS))
49 typedef struct file cfs_param_file_t;
50 typedef struct inode cfs_inode_t;
51 typedef struct proc_inode cfs_proc_inode_t;
52 typedef struct seq_file cfs_seq_file_t;
53 typedef struct seq_operations cfs_seq_ops_t;
54 typedef struct file_operations cfs_param_file_ops_t;
55 typedef cfs_module_t *cfs_param_module_t;
56 typedef struct proc_dir_entry cfs_param_dentry_t;
57 typedef struct poll_table_struct cfs_poll_table_t;
58 #define CFS_PARAM_MODULE THIS_MODULE
59 #define CFS_PDE(value) PDE(value)
60 #define cfs_file_private(file) (file->private_data)
61 #define cfs_dentry_data(dentry) (dentry->data)
62 #define cfs_proc_inode_pde(proc_inode) (proc_inode->pde)
63 #define cfs_proc_inode(proc_inode) (proc_inode->vfs_inode)
64 #define cfs_seq_read_common seq_read
65 #define cfs_seq_lseek_common seq_lseek
66 #define cfs_seq_private(seq) (seq->private)
67 #define cfs_seq_printf(seq, format, ...) seq_printf(seq, format, \
69 #define cfs_seq_release(inode, file) seq_release(inode, file)
70 #define cfs_seq_puts(seq, s) seq_puts(seq, s)
71 #define cfs_seq_putc(seq, s) seq_putc(seq, s)
72 #define cfs_seq_read(file, buf, count, ppos, rc) (rc = seq_read(file, buf, \
74 #define cfs_seq_open(file, ops, rc) (rc = seq_open(file, ops))
76 /* in lprocfs_stat.c, to protect the private data for proc entries */
77 extern cfs_rw_semaphore_t _lprocfs_lock;
79 /* to begin from 2.6.23, Linux defines self file_operations (proc_reg_file_ops)
80 * in procfs, the proc file_operation defined by Lustre (lprocfs_generic_fops)
81 * will be wrapped into the new defined proc_reg_file_ops, which instroduces
82 * user count in proc_dir_entrey(pde_users) to protect the proc entry from
83 * being deleted. then the protection lock (_lprocfs_lock) defined by Lustre
84 * isn't necessary anymore for lprocfs_generic_fops(e.g. lprocfs_fops_read).
85 * see bug19706 for detailed information.
87 #ifndef HAVE_PROCFS_USERS
89 #define LPROCFS_ENTRY() \
91 cfs_down_read(&_lprocfs_lock); \
94 #define LPROCFS_EXIT() \
96 cfs_up_read(&_lprocfs_lock); \
100 #define LPROCFS_ENTRY() do{ }while(0)
101 #define LPROCFS_EXIT() do{ }while(0)
104 #ifdef HAVE_PROCFS_DELETED
106 #ifdef HAVE_PROCFS_USERS
107 #error proc_dir_entry->deleted is conflicted with proc_dir_entry->pde_users
111 int LPROCFS_ENTRY_AND_CHECK(struct proc_dir_entry *dp)
120 #elif defined(HAVE_PROCFS_USERS) /* !HAVE_PROCFS_DELETED*/
122 int LPROCFS_ENTRY_AND_CHECK(struct proc_dir_entry *dp)
125 spin_lock(&(dp)->pde_unload_lock);
126 if (dp->proc_fops == NULL)
128 spin_unlock(&(dp)->pde_unload_lock);
133 #else /* !HAVE_PROCFS_DELETED*/
135 int LPROCFS_ENTRY_AND_CHECK(struct proc_dir_entry *dp)
140 #endif /* HAVE_PROCFS_DELETED */
141 #define LPROCFS_SRCH_ENTRY() \
143 down_read(&_lprocfs_lock); \
146 #define LPROCFS_SRCH_EXIT() \
148 up_read(&_lprocfs_lock); \
151 #define LPROCFS_WRITE_ENTRY() \
153 cfs_down_write(&_lprocfs_lock); \
156 #define LPROCFS_WRITE_EXIT() \
158 cfs_up_write(&_lprocfs_lock); \
162 typedef struct cfs_params_file {
165 unsigned int param_flags;
168 typedef struct cfs_param_inode {
172 typedef struct cfs_param_dentry {
174 } cfs_param_dentry_t;
176 typedef struct cfs_proc_inode {
177 cfs_param_dentry_t *param_pde;
178 cfs_inode_t param_inode;
181 struct cfs_seq_operations;
182 typedef struct cfs_seq_file {
190 struct cfs_seq_operations *op;
194 typedef struct cfs_seq_operations {
195 void *(*start) (cfs_seq_file_t *m, loff_t *pos);
196 void (*stop) (cfs_seq_file_t *m, void *v);
197 void *(*next) (cfs_seq_file_t *m, void *v, loff_t *pos);
198 int (*show) (cfs_seq_file_t *m, void *v);
201 typedef void *cfs_param_module_t;
202 typedef void *cfs_poll_table_t;
204 typedef struct cfs_param_file_ops {
205 cfs_param_module_t owner;
206 int (*open) (cfs_inode_t *, cfs_file_t *);
207 loff_t (*llseek)(cfs_file_t *, loff_t, int);
208 int (*release) (cfs_inode_t *, cfs_param_file_t *);
209 unsigned int (*poll) (cfs_file_t *, cfs_poll_table_t *);
210 ssize_t (*write) (cfs_file_t *, const char *, size_t, loff_t *);
211 ssize_t (*read)(cfs_file_t *, char *, size_t, loff_t *);
212 } cfs_param_file_ops_t;
213 typedef cfs_param_file_ops_t *cfs_lproc_filep_t;
215 static inline cfs_proc_inode_t *FAKE_PROC_I(const cfs_inode_t *inode)
217 return container_of(inode, cfs_proc_inode_t, param_inode);
220 static inline cfs_param_dentry_t *FAKE_PDE(cfs_inode_t *inode)
222 return FAKE_PROC_I(inode)->param_pde;
225 #define CFS_PARAM_MODULE NULL
226 #define CFS_PDE(value) FAKE_PDE(value)
227 #define cfs_file_private(file) (file->param_private)
228 #define cfs_dentry_data(dentry) (dentry->param_data)
229 #define cfs_proc_inode(proc_inode) (proc_inode->param_inode)
230 #define cfs_proc_inode_pde(proc_inode) (proc_inode->param_pde)
231 #define cfs_seq_read_common NULL
232 #define cfs_seq_lseek_common NULL
233 #define cfs_seq_private(seq) (seq->private)
234 #define cfs_seq_read(file, buf, count, ppos, rc) do {} while(0)
235 #define cfs_seq_open(file, ops, rc) \
237 cfs_seq_file_t *p = cfs_file_private(file); \
239 LIBCFS_ALLOC(p, sizeof(*p)); \
244 cfs_file_private(file) = p; \
246 memset(p, 0, sizeof(*p)); \
251 #define LPROCFS_ENTRY() do {} while(0)
252 #define LPROCFS_EXIT() do {} while(0)
254 int LPROCFS_ENTRY_AND_CHECK(cfs_param_dentry_t *dp)
259 #define LPROCFS_WRITE_ENTRY() do {} while(0)
260 #define LPROCFS_WRITE_EXIT() do {} while(0)
264 /* XXX: params_tree APIs */
266 #endif /* __PARAMS_TREE_H__ */