lustre/include/linux/lustre_light.h

   1 /* object based disk file system
   2  *
   3  * This code is issued under the GNU General Public License.
   4  * See the file COPYING in this distribution
   5  *
   6  * Copyright (C), 1999, Stelias Computing Inc
   7  *
   8  *
   9  */
  10
  11
  12 #ifndef _LL_H
  13 #define _LL_H
  14 #include <linux/obd_class.h>
  15 #include <linux/obdo.h>
  16 #include <linux/list.h>
  17
  18 #define LL_SUPER_MAGIC 0x0BD00BD0;
  19
  20 struct ll_inode_info {
  21         int              lli_flags;
  22         struct list_head lli_inodes;
  23         struct list_head lli_pages;
  24         char             lli_inline[OBD_INLINESZ];
  25 };
  26
  27 struct ll_sb_info {
  28         struct list_head         ll_list;      /* list of supers */
  29         struct obd_conn          ll_conn;
  30         struct super_block      *ll_super;
  31         //        struct obd_device       *ll_obd;
  32         //struct obd_ops          *ll_ops;
  33         ino_t                    ll_rootino;   /* number of root inode */
  34         int                      ll_minor;     /* minor of /dev/obdX */
  35         struct list_head         ll_inodes;    /* list of dirty inodes */
  36         unsigned long            ll_cache_count;
  37         struct semaphore         ll_list_mutex;
  38 };
  39
  40
  41 static inline struct ll_inode_info *ll_i2info(struct inode *inode)
  42 {
  43         return (struct ll_inode_info *)&(inode->u.generic_ip);
  44 }
  45
  46 static inline int ll_has_inline(struct inode *inode)
  47 {
  48         return (ll_i2info(inode)->lli_flags & OBD_FL_INLINEDATA);
  49 }
  50
  51 static void inline ll_from_inode(struct obdo *oa, struct inode *inode)
  52 {
  53         struct ll_inode_info *oinfo = ll_i2info(inode);
  54
  55         CDEBUG(D_INFO, "src inode %ld, dst obdo %ld valid 0x%08x\n",
  56                inode->i_ino, (long)oa->o_id, oa->o_valid);
  57         obdo_from_inode(oa, inode);
  58         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
  59                 CDEBUG(D_INODE, "copying device %x from inode to obdo\n",
  60                        inode->i_rdev);
  61                 *((obd_rdev *)oa->o_inline) = kdev_t_to_nr(inode->i_rdev);
  62                 oa->o_obdflags |= OBD_FL_INLINEDATA;
  63                 oa->o_valid |= OBD_MD_FLINLINE;
  64         } else if (ll_has_inline(inode)) {
  65                 CDEBUG(D_INODE, "copying inline data from inode to obdo\n");
  66                 memcpy(oa->o_inline, oinfo->lli_inline, OBD_INLINESZ);
  67                 oa->o_obdflags |= OBD_FL_INLINEDATA;
  68                 oa->o_valid |= OBD_MD_FLINLINE;
  69         }
  70 } /* ll_from_inode */
  71
  72 static __inline__ void mds_rep_to_inode(struct inode *dst, struct mds_rep *rep)
  73 {
  74
  75         if ( rep->valid & OBD_MD_FLID )
  76                 dst->i_ino = rep->ino;
  77         if ( rep->valid & OBD_MD_FLATIME )
  78                 dst->i_atime = rep->atime;
  79         if ( rep->valid & OBD_MD_FLMTIME )
  80                 dst->i_mtime = rep->mtime;
  81         if ( rep->valid & OBD_MD_FLCTIME )
  82                 dst->i_ctime = rep->ctime;
  83         if ( rep->valid & OBD_MD_FLSIZE )
  84                 dst->i_size = rep->size;
  85         if ( rep->valid & OBD_MD_FLMODE )
  86                 dst->i_mode = rep->mode;
  87         if ( rep->valid & OBD_MD_FLUID )
  88                 dst->i_uid = rep->uid;
  89         if ( rep->valid & OBD_MD_FLGID )
  90                 dst->i_gid = rep->gid;
  91         if ( rep->valid & OBD_MD_FLFLAGS )
  92                 dst->i_flags = rep->flags;
  93         if ( rep->valid & OBD_MD_FLNLINK )
  94                 dst->i_nlink = rep->nlink;
  95         if ( rep->valid & OBD_MD_FLGENER )
  96                 dst->i_generation = rep->generation;
  97 }
  98
  99 static void inline ll_to_inode(struct inode *inode, struct mds_rep *rep)
 100 {
 101         CDEBUG(D_INFO, "src obdo %d valid 0x%08x, dst inode %ld\n",
 102                rep->ino, rep->valid, inode->i_ino);
 103
 104         mds_rep_to_inode(inode, rep);
 105
 106 #if 0
 107         if (obdo_has_inline(oa)) {
 108                 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) ||
 109                     S_ISFIFO(inode->i_mode)) {
 110                         obd_rdev rdev = *((obd_rdev *)oa->o_inline);
 111                         CDEBUG(D_INODE,
 112                                "copying device %x from obdo to inode\n", rdev);
 113                         init_special_inode(inode, inode->i_mode, rdev);
 114                 } else {
 115                         CDEBUG(D_INFO, "copying inline from obdo to inode\n");
 116                         memcpy(oinfo->lli_inline, oa->o_inline, OBD_INLINESZ);
 117                 }
 118                 oinfo->lli_flags |= OBD_FL_INLINEDATA;
 119         }
 120 #endif
 121 } /* ll_to_inode */
 122
 123
 124
 125
 126 /* super.c */
 127 struct ll_pgrq {
 128         struct list_head         rq_plist;      /* linked list of req's */
 129         unsigned long            rq_jiffies;
 130         struct page             *rq_page;       /* page to be written */
 131 };
 132
 133 extern struct list_head ll_super_list;       /* list of all LL superblocks */
 134
 135
 136
 137 /* dir.c */
 138 #define EXT2_DIR_PAD                    4
 139 #define EXT2_DIR_ROUND                  (EXT2_DIR_PAD - 1)
 140 #define EXT2_DIR_REC_LEN(name_len)      (((name_len) + 8 + EXT2_DIR_ROUND) & \
 141                                          ~EXT2_DIR_ROUND)
 142 #define EXT2_NAME_LEN 255
 143
 144 int ll_check_dir_entry (const char * function, struct inode * dir,
 145                           struct ext2_dir_entry_2 * de, struct page * page,
 146                           unsigned long offset);
 147 extern struct file_operations ll_dir_operations;
 148 extern struct inode_operations ll_dir_inode_operations;
 149
 150 /* file.c */
 151 extern struct file_operations ll_file_operations;
 152 extern struct inode_operations ll_file_inode_operations;
 153
 154 /* flush.c */
 155 void ll_dequeue_pages(struct inode *inode);
 156 int ll_flushd_init(void);
 157 int ll_flushd_cleanup(void);
 158 int ll_flush_reqs(struct list_head *inode_list, unsigned long check_time);
 159 int ll_flush_dirty_pages(unsigned long check_time);
 160
 161 /* namei.c */
 162 /*
 163  * Structure of the super block
 164  */
 165
 166
 167 #define EXT2_SB(sb)     (&((sb)->u.ext2_sb))
 168 /*
 169  * Maximal count of links to a file
 170  */
 171 #define EXT2_LINK_MAX           32000
 172 /*
 173  * Ext2 directory file types.  Only the low 3 bits are used.  The
 174  * other bits are reserved for now.
 175  */
 176 #define EXT2_FT_UNKNOWN         0
 177 #define EXT2_FT_REG_FILE        1
 178 #define EXT2_FT_DIR             2
 179 #define EXT2_FT_CHRDEV          3
 180 #define EXT2_FT_BLKDEV          4
 181 #define EXT2_FT_FIFO            5
 182 #define EXT2_FT_SOCK            6
 183 #define EXT2_FT_SYMLINK         7
 184
 185 #define EXT2_FT_MAX             8
 186
 187 #define EXT2_BTREE_FL                   0x00001000 /* btree format dir */
 188 #define EXT2_RESERVED_FL                0x80000000 /* reserved for ext2 lib */
 189 #define EXT2_FEATURE_INCOMPAT_FILETYPE          0x0002
 190 #define EXT2_HAS_COMPAT_FEATURE(sb,mask)                        \
 191         ( EXT2_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) )
 192 #define EXT2_HAS_INCOMPAT_FEATURE(sb,mask)                      \
 193         ( EXT2_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) )
 194
 195 /* rw.c */
 196 int ll_do_writepage(struct page *, int sync);
 197 int ll_init_pgrqcache(void);
 198 void ll_cleanup_pgrqcache(void);
 199 inline void ll_pgrq_del(struct ll_pgrq *pgrq);
 200 int ll_readpage(struct file *file, struct page *page);
 201 int ll_prepare_write(struct file *file, struct page *page, unsigned from, unsigned to);
 202 int ll_commit_write(struct file *file, struct page *page, unsigned from, unsigned to);
 203 int ll_writepage(struct page *page);
 204 struct page *ll_getpage(struct inode *inode, unsigned long offset,
 205                            int create, int locked);
 206 int ll_write_one_page(struct file *file, struct page *page,
 207                          unsigned long offset, unsigned long bytes,
 208                          const char * buf);
 209 int ll_do_vec_wr(struct inode **inodes, obd_count num_io, obd_count num_oa,
 210                     struct obdo **obdos, obd_count *oa_bufs,
 211                     struct page **pages, char **bufs, obd_size *counts,
 212                     obd_off *offsets, obd_flag *flags);
 213 void ll_truncate(struct inode *inode);
 214
 215 /* super.c */
 216 extern long ll_cache_count;
 217 extern long ll_mutex_start;
 218
 219 /* symlink.c */
 220 extern struct inode_operations ll_fast_symlink_inode_operations;
 221 extern struct inode_operations ll_symlink_inode_operations;
 222
 223 /* sysctl.c */
 224 void ll_sysctl_init(void);
 225 void ll_sysctl_clean(void);
 226
 227 static inline struct ll_sb_info *ll_i2sbi(struct inode *inode)
 228 {
 229         return (struct ll_sb_info *) &(inode->i_sb->u.generic_sbp);
 230 }
 231
 232 static inline struct list_head *ll_iplist(struct inode *inode)
 233 {
 234         struct ll_inode_info *info = ll_i2info(inode);
 235
 236         return &info->lli_pages;
 237 }
 238
 239 static inline struct list_head *ll_islist(struct inode *inode)
 240 {
 241         struct ll_inode_info *info = ll_i2info(inode);
 242
 243         return &info->lli_inodes;
 244 }
 245
 246 static inline struct list_head *ll_slist(struct inode *inode)
 247 {
 248         struct ll_sb_info *sbi = ll_i2sbi(inode);
 249
 250         return &sbi->ll_inodes;
 251 }
 252
 253 static void inline ll_set_size (struct inode *inode, obd_size size)
 254 {
 255        inode->i_size = size;
 256        inode->i_blocks = (inode->i_size + inode->i_sb->s_blocksize - 1) >>
 257                inode->i_sb->s_blocksize_bits;
 258 } /* ll_set_size */
 259
 260
 261
 262 #define obd_down(mutex) {                                               \
 263         /* CDEBUG(D_INFO, "get lock\n"); */                             \
 264         ll_mutex_start = jiffies;                                    \
 265         down(mutex);                                                    \
 266         if (jiffies - ll_mutex_start)                                \
 267                 CDEBUG(D_CACHE, "waited on mutex %ld jiffies\n",        \
 268                        jiffies - ll_mutex_start);                    \
 269 }
 270
 271 #define obd_up(mutex) {                                                 \
 272         up(mutex);                                                      \
 273         if (jiffies - ll_mutex_start > 1)                            \
 274                 CDEBUG(D_CACHE, "held mutex for %ld jiffies\n",         \
 275                        jiffies - ll_mutex_start);                    \
 276         /* CDEBUG(D_INFO, "free lock\n"); */                            \
 277 }
 278
 279 /* We track if a page has been added to the OBD page cache by stting a
 280  * flag on the page.  We have chosen a bit that will hopefully not be
 281  * used for a while.
 282  */
 283 #define PG_obdcache 29
 284 #define OBDAddCachePage(page)   test_and_set_bit(PG_obdcache, &(page)->flags)
 285 #define OBDClearCachePage(page) clear_bit(PG_obdcache, &(page)->flags)
 286
 287 static inline void ll_print_plist(struct inode *inode)
 288 {
 289         struct list_head *page_list = ll_iplist(inode);
 290         struct list_head *tmp;
 291
 292         CDEBUG(D_INFO, "inode %ld: page", inode->i_ino);
 293         /* obd_down(&ll_i2sbi(inode)->ll_list_mutex); */
 294         if (list_empty(page_list)) {
 295                 CDEBUG(D_INFO, " list empty\n");
 296                 obd_up(&ll_i2sbi(inode)->ll_list_mutex);
 297                 return;
 298         }
 299
 300         tmp = page_list;
 301         while ( (tmp = tmp->next) != page_list) {
 302                 struct ll_pgrq *pgrq;
 303                 pgrq = list_entry(tmp, struct ll_pgrq, rq_plist);
 304                 CDEBUG(D_INFO, " %p", pgrq->rq_page);
 305         }
 306         CDEBUG(D_INFO, "\n");
 307         /* obd_up(&ll_i2sbi(inode)->ll_list_mutex); */
 308 }
 309 #include <linux/obdo.h>
 310
 311 #endif
 312