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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 struct rw_semaphore _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 down_read(&_lprocfs_lock); \
94 #define LPROCFS_EXIT() \
96 up_read(&_lprocfs_lock); \
100 #define LPROCFS_ENTRY() do{ }while(0)
101 #define LPROCFS_EXIT() do{ }while(0)
104 #ifdef HAVE_PROCFS_DELETED
107 int LPROCFS_ENTRY_AND_CHECK(struct proc_dir_entry *dp)
116 #elif defined(HAVE_PROCFS_USERS) /* !HAVE_PROCFS_DELETED*/
118 int LPROCFS_ENTRY_AND_CHECK(struct proc_dir_entry *dp)
122 spin_lock(&(dp)->pde_unload_lock);
123 if (dp->proc_fops == NULL)
125 spin_unlock(&(dp)->pde_unload_lock);
130 #else /* !HAVE_PROCFS_DELETED*/
132 int LPROCFS_ENTRY_AND_CHECK(struct proc_dir_entry *dp)
137 #endif /* HAVE_PROCFS_DELETED */
138 #define LPROCFS_SRCH_ENTRY() \
140 down_read(&_lprocfs_lock); \
143 #define LPROCFS_SRCH_EXIT() \
145 up_read(&_lprocfs_lock); \
148 #define LPROCFS_WRITE_ENTRY() \
150 down_write(&_lprocfs_lock); \
153 #define LPROCFS_WRITE_EXIT() \
155 up_write(&_lprocfs_lock); \
159 typedef struct cfs_params_file {
162 unsigned int param_flags;
165 typedef struct cfs_param_inode {
169 typedef struct cfs_param_dentry {
171 } cfs_param_dentry_t;
173 typedef struct cfs_proc_inode {
174 cfs_param_dentry_t *param_pde;
175 cfs_inode_t param_inode;
178 struct cfs_seq_operations;
179 typedef struct cfs_seq_file {
187 struct cfs_seq_operations *op;
191 typedef struct cfs_seq_operations {
192 void *(*start) (cfs_seq_file_t *m, loff_t *pos);
193 void (*stop) (cfs_seq_file_t *m, void *v);
194 void *(*next) (cfs_seq_file_t *m, void *v, loff_t *pos);
195 int (*show) (cfs_seq_file_t *m, void *v);
198 typedef void *cfs_param_module_t;
199 typedef void *cfs_poll_table_t;
201 typedef struct cfs_param_file_ops {
202 cfs_param_module_t owner;
203 int (*open) (cfs_inode_t *, cfs_file_t *);
204 loff_t (*llseek)(cfs_file_t *, loff_t, int);
205 int (*release) (cfs_inode_t *, cfs_param_file_t *);
206 unsigned int (*poll) (cfs_file_t *, cfs_poll_table_t *);
207 ssize_t (*write) (cfs_file_t *, const char *, size_t, loff_t *);
208 ssize_t (*read)(cfs_file_t *, char *, size_t, loff_t *);
209 } cfs_param_file_ops_t;
210 typedef cfs_param_file_ops_t *cfs_lproc_filep_t;
212 static inline cfs_proc_inode_t *FAKE_PROC_I(const cfs_inode_t *inode)
214 return container_of(inode, cfs_proc_inode_t, param_inode);
217 static inline cfs_param_dentry_t *FAKE_PDE(cfs_inode_t *inode)
219 return FAKE_PROC_I(inode)->param_pde;
222 #define CFS_PARAM_MODULE NULL
223 #define CFS_PDE(value) FAKE_PDE(value)
224 #define cfs_file_private(file) (file->param_private)
225 #define cfs_dentry_data(dentry) (dentry->param_data)
226 #define cfs_proc_inode(proc_inode) (proc_inode->param_inode)
227 #define cfs_proc_inode_pde(proc_inode) (proc_inode->param_pde)
228 #define cfs_seq_read_common NULL
229 #define cfs_seq_lseek_common NULL
230 #define cfs_seq_private(seq) (seq->private)
231 #define cfs_seq_read(file, buf, count, ppos, rc) do {} while(0)
232 #define cfs_seq_open(file, ops, rc) \
234 cfs_seq_file_t *p = cfs_file_private(file); \
236 LIBCFS_ALLOC(p, sizeof(*p)); \
241 cfs_file_private(file) = p; \
243 memset(p, 0, sizeof(*p)); \
248 #define LPROCFS_ENTRY() do {} while(0)
249 #define LPROCFS_EXIT() do {} while(0)
251 int LPROCFS_ENTRY_AND_CHECK(cfs_param_dentry_t *dp)
256 #define LPROCFS_WRITE_ENTRY() do {} while(0)
257 #define LPROCFS_WRITE_EXIT() do {} while(0)
261 /* XXX: params_tree APIs */
263 #endif /* __PARAMS_TREE_H__ */