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/bug.h> 11 #include <linux/fs.h> 12 #include <linux/mempool.h> 13 #include <linux/pagemap.h> 14 #include <linux/wait.h> 15 #include <linux/writeback.h> 16 #include <linux/slab.h> 17 18 #include "types.h" 19 #include "messenger.h" 20 #include "msgpool.h" 21 #include "mon_client.h" 22 #include "osd_client.h" 23 #include "ceph_fs.h" 24 25 /* 26 * Supported features 27 */ 28 #define CEPH_FEATURE_SUPPORTED_DEFAULT CEPH_FEATURE_NOSRCADDR 29 #define CEPH_FEATURE_REQUIRED_DEFAULT CEPH_FEATURE_NOSRCADDR 30 31 /* 32 * mount options 33 */ 34 #define CEPH_OPT_FSID (1<<0) 35 #define CEPH_OPT_NOSHARE (1<<1) /* don't share client with other sbs */ 36 #define CEPH_OPT_MYIP (1<<2) /* specified my ip */ 37 #define CEPH_OPT_NOCRC (1<<3) /* no data crc on writes */ 38 39 #define CEPH_OPT_DEFAULT (0) 40 41 #define ceph_set_opt(client, opt) \ 42 (client)->options->flags |= CEPH_OPT_##opt; 43 #define ceph_test_opt(client, opt) \ 44 (!!((client)->options->flags & CEPH_OPT_##opt)) 45 46 struct ceph_options { 47 int flags; 48 struct ceph_fsid fsid; 49 struct ceph_entity_addr my_addr; 50 int mount_timeout; 51 int osd_idle_ttl; 52 int osd_timeout; 53 int osd_keepalive_timeout; 54 55 /* 56 * any type that can't be simply compared or doesn't need need 57 * to be compared should go beyond this point, 58 * ceph_compare_options() should be updated accordingly 59 */ 60 61 struct ceph_entity_addr *mon_addr; /* should be the first 62 pointer type of args */ 63 int num_mon; 64 char *name; 65 struct ceph_crypto_key *key; 66 }; 67 68 /* 69 * defaults 70 */ 71 #define CEPH_MOUNT_TIMEOUT_DEFAULT 60 72 #define CEPH_OSD_TIMEOUT_DEFAULT 60 /* seconds */ 73 #define CEPH_OSD_KEEPALIVE_DEFAULT 5 74 #define CEPH_OSD_IDLE_TTL_DEFAULT 60 75 76 #define CEPH_MSG_MAX_FRONT_LEN (16*1024*1024) 77 #define CEPH_MSG_MAX_DATA_LEN (16*1024*1024) 78 79 #define CEPH_AUTH_NAME_DEFAULT "guest" 80 81 /* 82 * Delay telling the MDS we no longer want caps, in case we reopen 83 * the file. Delay a minimum amount of time, even if we send a cap 84 * message for some other reason. Otherwise, take the oppotunity to 85 * update the mds to avoid sending another message later. 86 */ 87 #define CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT 5 /* cap release delay */ 88 #define CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT 60 /* cap release delay */ 89 90 #define CEPH_CAP_RELEASE_SAFETY_DEFAULT (CEPH_CAPS_PER_RELEASE * 4) 91 92 /* mount state */ 93 enum { 94 CEPH_MOUNT_MOUNTING, 95 CEPH_MOUNT_MOUNTED, 96 CEPH_MOUNT_UNMOUNTING, 97 CEPH_MOUNT_UNMOUNTED, 98 CEPH_MOUNT_SHUTDOWN, 99 }; 100 101 /* 102 * subtract jiffies 103 */ 104 static inline unsigned long time_sub(unsigned long a, unsigned long b) 105 { 106 BUG_ON(time_after(b, a)); 107 return (long)a - (long)b; 108 } 109 110 struct ceph_mds_client; 111 112 /* 113 * per client state 114 * 115 * possibly shared by multiple mount points, if they are 116 * mounting the same ceph filesystem/cluster. 117 */ 118 struct ceph_client { 119 struct ceph_fsid fsid; 120 bool have_fsid; 121 122 void *private; 123 124 struct ceph_options *options; 125 126 struct mutex mount_mutex; /* serialize mount attempts */ 127 wait_queue_head_t auth_wq; 128 int auth_err; 129 130 int (*extra_mon_dispatch)(struct ceph_client *, struct ceph_msg *); 131 132 u32 supported_features; 133 u32 required_features; 134 135 struct ceph_messenger *msgr; /* messenger instance */ 136 struct ceph_mon_client monc; 137 struct ceph_osd_client osdc; 138 139 #ifdef CONFIG_DEBUG_FS 140 struct dentry *debugfs_dir; 141 struct dentry *debugfs_monmap; 142 struct dentry *debugfs_osdmap; 143 #endif 144 }; 145 146 147 148 /* 149 * snapshots 150 */ 151 152 /* 153 * A "snap context" is the set of existing snapshots when we 154 * write data. It is used by the OSD to guide its COW behavior. 155 * 156 * The ceph_snap_context is refcounted, and attached to each dirty 157 * page, indicating which context the dirty data belonged when it was 158 * dirtied. 159 */ 160 struct ceph_snap_context { 161 atomic_t nref; 162 u64 seq; 163 int num_snaps; 164 u64 snaps[]; 165 }; 166 167 static inline struct ceph_snap_context * 168 ceph_get_snap_context(struct ceph_snap_context *sc) 169 { 170 /* 171 printk("get_snap_context %p %d -> %d\n", sc, atomic_read(&sc->nref), 172 atomic_read(&sc->nref)+1); 173 */ 174 if (sc) 175 atomic_inc(&sc->nref); 176 return sc; 177 } 178 179 static inline void ceph_put_snap_context(struct ceph_snap_context *sc) 180 { 181 if (!sc) 182 return; 183 /* 184 printk("put_snap_context %p %d -> %d\n", sc, atomic_read(&sc->nref), 185 atomic_read(&sc->nref)-1); 186 */ 187 if (atomic_dec_and_test(&sc->nref)) { 188 /*printk(" deleting snap_context %p\n", sc);*/ 189 kfree(sc); 190 } 191 } 192 193 /* 194 * calculate the number of pages a given length and offset map onto, 195 * if we align the data. 196 */ 197 static inline int calc_pages_for(u64 off, u64 len) 198 { 199 return ((off+len+PAGE_CACHE_SIZE-1) >> PAGE_CACHE_SHIFT) - 200 (off >> PAGE_CACHE_SHIFT); 201 } 202 203 /* ceph_common.c */ 204 extern const char *ceph_msg_type_name(int type); 205 extern int ceph_check_fsid(struct ceph_client *client, struct ceph_fsid *fsid); 206 extern struct kmem_cache *ceph_inode_cachep; 207 extern struct kmem_cache *ceph_cap_cachep; 208 extern struct kmem_cache *ceph_dentry_cachep; 209 extern struct kmem_cache *ceph_file_cachep; 210 211 extern struct ceph_options *ceph_parse_options(char *options, 212 const char *dev_name, const char *dev_name_end, 213 int (*parse_extra_token)(char *c, void *private), 214 void *private); 215 extern void ceph_destroy_options(struct ceph_options *opt); 216 extern int ceph_compare_options(struct ceph_options *new_opt, 217 struct ceph_client *client); 218 extern struct ceph_client *ceph_create_client(struct ceph_options *opt, 219 void *private, 220 unsigned supported_features, 221 unsigned required_features); 222 extern u64 ceph_client_id(struct ceph_client *client); 223 extern void ceph_destroy_client(struct ceph_client *client); 224 extern int __ceph_open_session(struct ceph_client *client, 225 unsigned long started); 226 extern int ceph_open_session(struct ceph_client *client); 227 228 /* pagevec.c */ 229 extern void ceph_release_page_vector(struct page **pages, int num_pages); 230 231 extern struct page **ceph_get_direct_page_vector(const char __user *data, 232 int num_pages, 233 bool write_page); 234 extern void ceph_put_page_vector(struct page **pages, int num_pages, 235 bool dirty); 236 extern void ceph_release_page_vector(struct page **pages, int num_pages); 237 extern struct page **ceph_alloc_page_vector(int num_pages, gfp_t flags); 238 extern int ceph_copy_user_to_page_vector(struct page **pages, 239 const char __user *data, 240 loff_t off, size_t len); 241 extern int ceph_copy_to_page_vector(struct page **pages, 242 const char *data, 243 loff_t off, size_t len); 244 extern int ceph_copy_from_page_vector(struct page **pages, 245 char *data, 246 loff_t off, size_t len); 247 extern int ceph_copy_page_vector_to_user(struct page **pages, char __user *data, 248 loff_t off, size_t len); 249 extern void ceph_zero_page_vector_range(int off, int len, struct page **pages); 250 251 252 #endif /* _FS_CEPH_SUPER_H */ 253