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         __u64            lli_objid;
  23         char             lli_inline[OBD_INLINESZ];
  24 };
  25
  26 struct ll_sb_info {
  27         struct list_head         ll_list;      /* list of supers */
  28         struct obd_conn          ll_conn;
  29         struct super_block      *ll_super;
  30         //        struct obd_device       *ll_obd;
  31         //struct obd_ops          *ll_ops;
  32         ino_t                    ll_rootino;   /* number of root inode */
  33         int                      ll_minor;     /* minor of /dev/obdX */
  34         struct list_head         ll_inodes;    /* list of dirty inodes */
  35         unsigned long            ll_cache_count;
  36         struct semaphore         ll_list_mutex;
  37 };
  38
  39
  40 static inline struct ll_inode_info *ll_i2info(struct inode *inode)
  41 {
  42         return (struct ll_inode_info *)&(inode->u.generic_ip);
  43 }
  44
  45 static inline int ll_has_inline(struct inode *inode)
  46 {
  47         return (ll_i2info(inode)->lli_flags & OBD_FL_INLINEDATA);
  48 }
  49
  50 static void inline ll_from_inode(struct obdo *oa, struct inode *inode)
  51 {
  52         struct ll_inode_info *oinfo = ll_i2info(inode);
  53
  54         CDEBUG(D_INFO, "src inode %ld, dst obdo %ld valid 0x%08x\n",
  55                inode->i_ino, (long)oa->o_id, oa->o_valid);
  56         obdo_from_inode(oa, inode);
  57         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
  58                 CDEBUG(D_INODE, "copying device %x from inode to obdo\n",
  59                        inode->i_rdev);
  60                 *((obd_rdev *)oa->o_inline) = kdev_t_to_nr(inode->i_rdev);
  61                 oa->o_obdflags |= OBD_FL_INLINEDATA;
  62                 oa->o_valid |= OBD_MD_FLINLINE;
  63         } else if (ll_has_inline(inode)) {
  64                 CDEBUG(D_INODE, "copying inline data from inode to obdo\n");
  65                 memcpy(oa->o_inline, oinfo->lli_inline, OBD_INLINESZ);
  66                 oa->o_obdflags |= OBD_FL_INLINEDATA;
  67                 oa->o_valid |= OBD_MD_FLINLINE;
  68         }
  69 } /* ll_from_inode */
  70
  71
  72
  73
  74
  75
  76 /* super.c */
  77 struct ll_pgrq {
  78         struct list_head         rq_plist;      /* linked list of req's */
  79         unsigned long            rq_jiffies;
  80         struct page             *rq_page;       /* page to be written */
  81 };
  82
  83 extern struct list_head ll_super_list;       /* list of all LL superblocks */
  84
  85
  86
  87 /* dir.c */
  88 #define EXT2_DIR_PAD                    4
  89 #define EXT2_DIR_ROUND                  (EXT2_DIR_PAD - 1)
  90 #define EXT2_DIR_REC_LEN(name_len)      (((name_len) + 8 + EXT2_DIR_ROUND) & \
  91                                          ~EXT2_DIR_ROUND)
  92 #define EXT2_NAME_LEN 255
  93
  94 int ll_check_dir_entry (const char * function, struct inode * dir,
  95                           struct ext2_dir_entry_2 * de, struct page * page,
  96                           unsigned long offset);
  97 extern struct file_operations ll_dir_operations;
  98 extern struct inode_operations ll_dir_inode_operations;
  99
 100 /* file.c */
 101 extern struct file_operations ll_file_operations;
 102 extern struct inode_operations ll_file_inode_operations;
 103
 104 /* flush.c */
 105 void ll_dequeue_pages(struct inode *inode);
 106 int ll_flushd_init(void);
 107 int ll_flushd_cleanup(void);
 108 int ll_flush_reqs(struct list_head *inode_list, unsigned long check_time);
 109 int ll_flush_dirty_pages(unsigned long check_time);
 110
 111 /* namei.c */
 112 /*
 113  * Structure of the super block
 114  */
 115
 116
 117 #define EXT2_SB(sb)     (&((sb)->u.ext2_sb))
 118 /*
 119  * Maximal count of links to a file
 120  */
 121 #define EXT2_LINK_MAX           32000
 122 /*
 123  * Ext2 directory file types.  Only the low 3 bits are used.  The
 124  * other bits are reserved for now.
 125  */
 126 #define EXT2_FT_UNKNOWN         0
 127 #define EXT2_FT_REG_FILE        1
 128 #define EXT2_FT_DIR             2
 129 #define EXT2_FT_CHRDEV          3
 130 #define EXT2_FT_BLKDEV          4
 131 #define EXT2_FT_FIFO            5
 132 #define EXT2_FT_SOCK            6
 133 #define EXT2_FT_SYMLINK         7
 134
 135 #define EXT2_FT_MAX             8
 136
 137 #define EXT2_BTREE_FL                   0x00001000 /* btree format dir */
 138 #define EXT2_RESERVED_FL                0x80000000 /* reserved for ext2 lib */
 139 #define EXT2_FEATURE_INCOMPAT_FILETYPE          0x0002
 140 #define EXT2_HAS_COMPAT_FEATURE(sb,mask)                        \
 141         ( EXT2_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) )
 142 #define EXT2_HAS_INCOMPAT_FEATURE(sb,mask)                      \
 143         ( EXT2_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) )
 144
 145 /* rw.c */
 146 int ll_do_writepage(struct page *, int sync);
 147 int ll_init_pgrqcache(void);
 148 void ll_cleanup_pgrqcache(void);
 149 inline void ll_pgrq_del(struct ll_pgrq *pgrq);
 150 int ll_readpage(struct file *file, struct page *page);
 151 int ll_prepare_write(struct file *file, struct page *page, unsigned from, unsigned to);
 152 int ll_commit_write(struct file *file, struct page *page, unsigned from, unsigned to);
 153 int ll_writepage(struct page *page);
 154 struct page *ll_getpage(struct inode *inode, unsigned long offset,
 155                            int create, int locked);
 156 int ll_write_one_page(struct file *file, struct page *page,
 157                          unsigned long offset, unsigned long bytes,
 158                          const char * buf);
 159 int ll_do_vec_wr(struct inode **inodes, obd_count num_io, obd_count num_oa,
 160                     struct obdo **obdos, obd_count *oa_bufs,
 161                     struct page **pages, char **bufs, obd_size *counts,
 162                     obd_off *offsets, obd_flag *flags);
 163 void ll_truncate(struct inode *inode);
 164
 165 /* super.c */
 166 extern long ll_cache_count;
 167 extern long ll_mutex_start;
 168
 169 /* symlink.c */
 170 extern struct inode_operations ll_fast_symlink_inode_operations;
 171 extern struct inode_operations ll_symlink_inode_operations;
 172
 173 /* sysctl.c */
 174 void ll_sysctl_init(void);
 175 void ll_sysctl_clean(void);
 176
 177 static inline struct ll_sb_info *ll_i2sbi(struct inode *inode)
 178 {
 179         return (struct ll_sb_info *) &(inode->i_sb->u.generic_sbp);
 180 }
 181
 182
 183 static inline struct list_head *ll_slist(struct inode *inode)
 184 {
 185         struct ll_sb_info *sbi = ll_i2sbi(inode);
 186
 187         return &sbi->ll_inodes;
 188 }
 189
 190 static void inline ll_set_size (struct inode *inode, obd_size size)
 191 {
 192        inode->i_size = size;
 193        inode->i_blocks = (inode->i_size + inode->i_sb->s_blocksize - 1) >>
 194                inode->i_sb->s_blocksize_bits;
 195 } /* ll_set_size */
 196
 197
 198
 199 #define obd_down(mutex) {                                               \
 200         /* CDEBUG(D_INFO, "get lock\n"); */                             \
 201         ll_mutex_start = jiffies;                                    \
 202         down(mutex);                                                    \
 203         if (jiffies - ll_mutex_start)                                \
 204                 CDEBUG(D_CACHE, "waited on mutex %ld jiffies\n",        \
 205                        jiffies - ll_mutex_start);                    \
 206 }
 207
 208 #define obd_up(mutex) {                                                 \
 209         up(mutex);                                                      \
 210         if (jiffies - ll_mutex_start > 1)                            \
 211                 CDEBUG(D_CACHE, "held mutex for %ld jiffies\n",         \
 212                        jiffies - ll_mutex_start);                    \
 213         /* CDEBUG(D_INFO, "free lock\n"); */                            \
 214 }
 215
 216 /* We track if a page has been added to the OBD page cache by stting a
 217  * flag on the page.  We have chosen a bit that will hopefully not be
 218  * used for a while.
 219  */
 220 #define PG_obdcache 29
 221 #define OBDAddCachePage(page)   test_and_set_bit(PG_obdcache, &(page)->flags)
 222 #define OBDClearCachePage(page) clear_bit(PG_obdcache, &(page)->flags)
 223
 224 #endif
 225