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libceph: fix null dereference when unregistering linger requests
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / include / linux / ceph / libceph.h
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YS		 1#ifndef _FS_CEPH_LIBCEPH_H
2#define _FS_CEPH_LIBCEPH_H
3
4#include "ceph_debug.h"
5
6#include <asm/unaligned.h>
7#include <linux/backing-dev.h>
8#include <linux/completion.h>
9#include <linux/exportfs.h>
10#include <linux/fs.h>
11#include <linux/mempool.h>
12#include <linux/pagemap.h>
13#include <linux/wait.h>
14#include <linux/writeback.h>
15#include <linux/slab.h>
16
17#include "types.h"
18#include "messenger.h"
19#include "msgpool.h"
20#include "mon_client.h"
21#include "osd_client.h"
22#include "ceph_fs.h"
23
24/*
25 * Supported features
26 */
27#define CEPH_FEATURE_SUPPORTED_DEFAULT CEPH_FEATURE_NOSRCADDR
28#define CEPH_FEATURE_REQUIRED_DEFAULT CEPH_FEATURE_NOSRCADDR
29
30/*
31 * mount options
32 */
33#define CEPH_OPT_FSID (1<<0)
34#define CEPH_OPT_NOSHARE (1<<1) /* don't share client with other sbs */
35#define CEPH_OPT_MYIP (1<<2) /* specified my ip */
36#define CEPH_OPT_NOCRC (1<<3) /* no data crc on writes */
37
38#define CEPH_OPT_DEFAULT (0);
39
40#define ceph_set_opt(client, opt) \
41 (client)->options->flags |= CEPH_OPT_##opt;
42#define ceph_test_opt(client, opt) \
43 (!!((client)->options->flags & CEPH_OPT_##opt))
44
45struct ceph_options {
46 int flags;
47 struct ceph_fsid fsid;
48 struct ceph_entity_addr my_addr;
49 int mount_timeout;
50 int osd_idle_ttl;
51 int osd_timeout;
52 int osd_keepalive_timeout;
53
54 /*
55 * any type that can't be simply compared or doesn't need need
56 * to be compared should go beyond this point,
57 * ceph_compare_options() should be updated accordingly
58 */
59
60 struct ceph_entity_addr *mon_addr; /* should be the first
61 pointer type of args */
62 int num_mon;
63 char *name;
64 char *secret;
65};
66
67/*
68 * defaults
69 */
70#define CEPH_MOUNT_TIMEOUT_DEFAULT 60
71#define CEPH_OSD_TIMEOUT_DEFAULT 60 /* seconds */
72#define CEPH_OSD_KEEPALIVE_DEFAULT 5
73#define CEPH_OSD_IDLE_TTL_DEFAULT 60
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YS		 74
75#define CEPH_MSG_MAX_FRONT_LEN (16*1024*1024)
76#define CEPH_MSG_MAX_DATA_LEN (16*1024*1024)
77
78#define CEPH_AUTH_NAME_DEFAULT "guest"
79
80/*
81 * Delay telling the MDS we no longer want caps, in case we reopen
82 * the file. Delay a minimum amount of time, even if we send a cap
83 * message for some other reason. Otherwise, take the oppotunity to
84 * update the mds to avoid sending another message later.
85 */
86#define CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT 5 /* cap release delay */
87#define CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT 60 /* cap release delay */
88
89#define CEPH_CAP_RELEASE_SAFETY_DEFAULT (CEPH_CAPS_PER_RELEASE * 4)
90
91/* mount state */
92enum {
93 CEPH_MOUNT_MOUNTING,
94 CEPH_MOUNT_MOUNTED,
95 CEPH_MOUNT_UNMOUNTING,
96 CEPH_MOUNT_UNMOUNTED,
97 CEPH_MOUNT_SHUTDOWN,
98};
99
100/*
101 * subtract jiffies
102 */
103static inline unsigned long time_sub(unsigned long a, unsigned long b)
104{
105 BUG_ON(time_after(b, a));
106 return (long)a - (long)b;
107}
108
109struct ceph_mds_client;
110
111/*
112 * per client state
113 *
114 * possibly shared by multiple mount points, if they are
115 * mounting the same ceph filesystem/cluster.
116 */
117struct ceph_client {
118 struct ceph_fsid fsid;
119 bool have_fsid;
120
121 void *private;
122
123 struct ceph_options *options;
124
125 struct mutex mount_mutex; /* serialize mount attempts */
126 wait_queue_head_t auth_wq;
127 int auth_err;
128
129 int (*extra_mon_dispatch)(struct ceph_client *, struct ceph_msg *);
130
131 u32 supported_features;
132 u32 required_features;
133
134 struct ceph_messenger *msgr; /* messenger instance */
135 struct ceph_mon_client monc;
136 struct ceph_osd_client osdc;
137
138#ifdef CONFIG_DEBUG_FS
139 struct dentry *debugfs_dir;
140 struct dentry *debugfs_monmap;
141 struct dentry *debugfs_osdmap;
142#endif
143};
144
145
146
147/*
148 * snapshots
149 */
150
151/*
152 * A "snap context" is the set of existing snapshots when we
153 * write data. It is used by the OSD to guide its COW behavior.
154 *
155 * The ceph_snap_context is refcounted, and attached to each dirty
156 * page, indicating which context the dirty data belonged when it was
157 * dirtied.
158 */
159struct ceph_snap_context {
160 atomic_t nref;
161 u64 seq;
162 int num_snaps;
163 u64 snaps[];
164};
165
166static inline struct ceph_snap_context *
167ceph_get_snap_context(struct ceph_snap_context *sc)
168{
169 /*
170 printk("get_snap_context %p %d -> %d\n", sc, atomic_read(&sc->nref),
171 atomic_read(&sc->nref)+1);
172 */
173 if (sc)
174 atomic_inc(&sc->nref);
175 return sc;
176}
177
178static inline void ceph_put_snap_context(struct ceph_snap_context *sc)
179{
180 if (!sc)
181 return;
182 /*
183 printk("put_snap_context %p %d -> %d\n", sc, atomic_read(&sc->nref),
184 atomic_read(&sc->nref)-1);
185 */
186 if (atomic_dec_and_test(&sc->nref)) {
187 /*printk(" deleting snap_context %p\n", sc);*/
188 kfree(sc);
189 }
190}
191
192/*
193 * calculate the number of pages a given length and offset map onto,
194 * if we align the data.
195 */
196static inline int calc_pages_for(u64 off, u64 len)
197{
198 return ((off+len+PAGE_CACHE_SIZE-1) >> PAGE_CACHE_SHIFT) -
199 (off >> PAGE_CACHE_SHIFT);
200}
201
202/* ceph_common.c */
203extern const char *ceph_msg_type_name(int type);
204extern int ceph_check_fsid(struct ceph_client *client, struct ceph_fsid *fsid);
205extern struct kmem_cache *ceph_inode_cachep;
206extern struct kmem_cache *ceph_cap_cachep;
207extern struct kmem_cache *ceph_dentry_cachep;
208extern struct kmem_cache *ceph_file_cachep;
209
210extern int ceph_parse_options(struct ceph_options **popt, char *options,
211 const char *dev_name, const char *dev_name_end,
212 int (*parse_extra_token)(char *c, void *private),
213 void *private);
214extern void ceph_destroy_options(struct ceph_options *opt);
215extern int ceph_compare_options(struct ceph_options *new_opt,
216 struct ceph_client *client);
217extern struct ceph_client *ceph_create_client(struct ceph_options *opt,
218 void *private);
219extern u64 ceph_client_id(struct ceph_client *client);
220extern void ceph_destroy_client(struct ceph_client *client);
221extern int __ceph_open_session(struct ceph_client *client,
222 unsigned long started);
223extern int ceph_open_session(struct ceph_client *client);
224
225/* pagevec.c */
226extern void ceph_release_page_vector(struct page **pages, int num_pages);
227
228extern struct page **ceph_get_direct_page_vector(const char __user *data,
b6aa5901
HC		 229 int num_pages,
230 bool write_page);
231extern void ceph_put_page_vector(struct page **pages, int num_pages,
232 bool dirty);
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YS		 233extern void ceph_release_page_vector(struct page **pages, int num_pages);
234extern struct page **ceph_alloc_page_vector(int num_pages, gfp_t flags);
235extern int ceph_copy_user_to_page_vector(struct page **pages,
236 const char __user *data,
237 loff_t off, size_t len);
238extern int ceph_copy_to_page_vector(struct page **pages,
239 const char *data,
240 loff_t off, size_t len);
241extern int ceph_copy_from_page_vector(struct page **pages,
242 char *data,
243 loff_t off, size_t len);
244extern int ceph_copy_page_vector_to_user(struct page **pages, char __user *data,
245 loff_t off, size_t len);
246extern void ceph_zero_page_vector_range(int off, int len, struct page **pages);
247
248
249#endif /* _FS_CEPH_SUPER_H */
kernel source for telekom puls (alcatel/mediatek)