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 void inline ll_to_inode(struct inode *inode, struct obdo *oa)
  73 {
  74         struct ll_inode_info *oinfo = ll_i2info(inode);
  75
  76         CDEBUG(D_INFO, "src obdo %ld valid 0x%08x, dst inode %ld\n",
  77                (long)oa->o_id, oa->o_valid, inode->i_ino);
  78
  79         obdo_to_inode(inode, oa);
  80
  81         if (obdo_has_inline(oa)) {
  82                 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) ||
  83                     S_ISFIFO(inode->i_mode)) {
  84                         obd_rdev rdev = *((obd_rdev *)oa->o_inline);
  85                         CDEBUG(D_INODE,
  86                                "copying device %x from obdo to inode\n", rdev);
  87                         init_special_inode(inode, inode->i_mode, rdev);
  88                 } else {
  89                         CDEBUG(D_INFO, "copying inline from obdo to inode\n");
  90                         memcpy(oinfo->lli_inline, oa->o_inline, OBD_INLINESZ);
  91                 }
  92                 oinfo->lli_flags |= OBD_FL_INLINEDATA;
  93         }
  94 } /* ll_to_inode */
  95
  96
  97
  98
  99 /* super.c */
 100 struct ll_pgrq {
 101         struct list_head         rq_plist;      /* linked list of req's */
 102         unsigned long            rq_jiffies;
 103         struct page             *rq_page;       /* page to be written */
 104 };
 105
 106 extern struct list_head ll_super_list;       /* list of all LL superblocks */
 107
 108
 109
 110 /* dir.c */
 111 #define EXT2_DIR_PAD                    4
 112 #define EXT2_DIR_ROUND                  (EXT2_DIR_PAD - 1)
 113 #define EXT2_DIR_REC_LEN(name_len)      (((name_len) + 8 + EXT2_DIR_ROUND) & \
 114                                          ~EXT2_DIR_ROUND)
 115 #define EXT2_NAME_LEN 255
 116
 117 int ll_check_dir_entry (const char * function, struct inode * dir,
 118                           struct ext2_dir_entry_2 * de, struct page * page,
 119                           unsigned long offset);
 120 extern struct file_operations ll_dir_operations;
 121 extern struct inode_operations ll_dir_inode_operations;
 122
 123 /* file.c */
 124 extern struct file_operations ll_file_operations;
 125 extern struct inode_operations ll_file_inode_operations;
 126
 127 /* flush.c */
 128 void ll_dequeue_pages(struct inode *inode);
 129 int ll_flushd_init(void);
 130 int ll_flushd_cleanup(void);
 131 int ll_flush_reqs(struct list_head *inode_list, unsigned long check_time);
 132 int ll_flush_dirty_pages(unsigned long check_time);
 133
 134 /* namei.c */
 135 /*
 136  * Structure of the super block
 137  */
 138
 139
 140 #define EXT2_SB(sb)     (&((sb)->u.ext2_sb))
 141 /*
 142  * Maximal count of links to a file
 143  */
 144 #define EXT2_LINK_MAX           32000
 145 /*
 146  * Ext2 directory file types.  Only the low 3 bits are used.  The
 147  * other bits are reserved for now.
 148  */
 149 #define EXT2_FT_UNKNOWN         0
 150 #define EXT2_FT_REG_FILE        1
 151 #define EXT2_FT_DIR             2
 152 #define EXT2_FT_CHRDEV          3
 153 #define EXT2_FT_BLKDEV          4
 154 #define EXT2_FT_FIFO            5
 155 #define EXT2_FT_SOCK            6
 156 #define EXT2_FT_SYMLINK         7
 157
 158 #define EXT2_FT_MAX             8
 159
 160 #define EXT2_BTREE_FL                   0x00001000 /* btree format dir */
 161 #define EXT2_RESERVED_FL                0x80000000 /* reserved for ext2 lib */
 162 #define EXT2_FEATURE_INCOMPAT_FILETYPE          0x0002
 163 #define EXT2_HAS_COMPAT_FEATURE(sb,mask)                        \
 164         ( EXT2_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) )
 165 #define EXT2_HAS_INCOMPAT_FEATURE(sb,mask)                      \
 166         ( EXT2_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) )
 167
 168 /* rw.c */
 169 int ll_do_writepage(struct page *, int sync);
 170 int ll_init_pgrqcache(void);
 171 void ll_cleanup_pgrqcache(void);
 172 inline void ll_pgrq_del(struct ll_pgrq *pgrq);
 173 int ll_readpage(struct file *file, struct page *page);
 174 int ll_prepare_write(struct file *file, struct page *page, unsigned from, unsigned to);
 175 int ll_commit_write(struct file *file, struct page *page, unsigned from, unsigned to);
 176 int ll_writepage(struct page *page);
 177 struct page *ll_getpage(struct inode *inode, unsigned long offset,
 178                            int create, int locked);
 179 int ll_write_one_page(struct file *file, struct page *page,
 180                          unsigned long offset, unsigned long bytes,
 181                          const char * buf);
 182 int ll_do_vec_wr(struct inode **inodes, obd_count num_io, obd_count num_oa,
 183                     struct obdo **obdos, obd_count *oa_bufs,
 184                     struct page **pages, char **bufs, obd_size *counts,
 185                     obd_off *offsets, obd_flag *flags);
 186 void ll_truncate(struct inode *inode);
 187
 188 /* super.c */
 189 extern long ll_cache_count;
 190 extern long ll_mutex_start;
 191
 192 /* symlink.c */
 193 extern struct inode_operations ll_fast_symlink_inode_operations;
 194 extern struct inode_operations ll_symlink_inode_operations;
 195
 196 /* sysctl.c */
 197 void ll_sysctl_init(void);
 198 void ll_sysctl_clean(void);
 199
 200 static inline struct ll_sb_info *ll_i2sbi(struct inode *inode)
 201 {
 202         return (struct ll_sb_info *) &(inode->i_sb->u.generic_sbp);
 203 }
 204
 205 static inline struct list_head *ll_iplist(struct inode *inode)
 206 {
 207         struct ll_inode_info *info = ll_i2info(inode);
 208
 209         return &info->lli_pages;
 210 }
 211
 212 static inline struct list_head *ll_islist(struct inode *inode)
 213 {
 214         struct ll_inode_info *info = ll_i2info(inode);
 215
 216         return &info->lli_inodes;
 217 }
 218
 219 static inline struct list_head *ll_slist(struct inode *inode)
 220 {
 221         struct ll_sb_info *sbi = ll_i2sbi(inode);
 222
 223         return &sbi->ll_inodes;
 224 }
 225
 226 static void inline ll_set_size (struct inode *inode, obd_size size)
 227 {
 228        inode->i_size = size;
 229        inode->i_blocks = (inode->i_size + inode->i_sb->s_blocksize - 1) >>
 230                inode->i_sb->s_blocksize_bits;
 231 } /* ll_set_size */
 232
 233
 234
 235 #define obd_down(mutex) {                                               \
 236         /* CDEBUG(D_INFO, "get lock\n"); */                             \
 237         ll_mutex_start = jiffies;                                    \
 238         down(mutex);                                                    \
 239         if (jiffies - ll_mutex_start)                                \
 240                 CDEBUG(D_CACHE, "waited on mutex %ld jiffies\n",        \
 241                        jiffies - ll_mutex_start);                    \
 242 }
 243
 244 #define obd_up(mutex) {                                                 \
 245         up(mutex);                                                      \
 246         if (jiffies - ll_mutex_start > 1)                            \
 247                 CDEBUG(D_CACHE, "held mutex for %ld jiffies\n",         \
 248                        jiffies - ll_mutex_start);                    \
 249         /* CDEBUG(D_INFO, "free lock\n"); */                            \
 250 }
 251
 252 /* We track if a page has been added to the OBD page cache by stting a
 253  * flag on the page.  We have chosen a bit that will hopefully not be
 254  * used for a while.
 255  */
 256 #define PG_obdcache 29
 257 #define OBDAddCachePage(page)   test_and_set_bit(PG_obdcache, &(page)->flags)
 258 #define OBDClearCachePage(page) clear_bit(PG_obdcache, &(page)->flags)
 259
 260 static inline void ll_print_plist(struct inode *inode)
 261 {
 262         struct list_head *page_list = ll_iplist(inode);
 263         struct list_head *tmp;
 264
 265         CDEBUG(D_INFO, "inode %ld: page", inode->i_ino);
 266         /* obd_down(&ll_i2sbi(inode)->ll_list_mutex); */
 267         if (list_empty(page_list)) {
 268                 CDEBUG(D_INFO, " list empty\n");
 269                 obd_up(&ll_i2sbi(inode)->ll_list_mutex);
 270                 return;
 271         }
 272
 273         tmp = page_list;
 274         while ( (tmp = tmp->next) != page_list) {
 275                 struct ll_pgrq *pgrq;
 276                 pgrq = list_entry(tmp, struct ll_pgrq, rq_plist);
 277                 CDEBUG(D_INFO, " %p", pgrq->rq_page);
 278         }
 279         CDEBUG(D_INFO, "\n");
 280         /* obd_up(&ll_i2sbi(inode)->ll_list_mutex); */
 281 }
 282 #include <linux/obdo.h>
 283
 284 #endif
 285