lustre/include/linux/obdfs.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 _OBDFS_H
  13 #define _OBDFS_H
  14 #include <linux/obd_class.h>
  15 #include <linux/obdo.h>
  16 #include <linux/list.h>
  17
  18 /* super.c */
  19 struct obdfs_pgrq {
  20         struct list_head         rq_plist;      /* linked list of req's */
  21         unsigned long            rq_jiffies;
  22         struct page             *rq_page;       /* page to be written */
  23 };
  24
  25 extern struct list_head obdfs_super_list;       /* list of all OBDFS superblocks */
  26
  27
  28
  29 /* dir.c */
  30 extern struct file_operations obdfs_dir_operations;
  31 extern struct inode_operations obdfs_dir_inode_operations;
  32
  33 /* file.c */
  34 extern struct file_operations obdfs_file_operations;
  35 extern struct inode_operations obdfs_file_inode_operations;
  36
  37 /* flush.c */
  38 void obdfs_dequeue_pages(struct inode *inode);
  39 int obdfs_flushd_init(void);
  40 int obdfs_flushd_cleanup(void);
  41 int obdfs_flush_reqs(struct list_head *inode_list, unsigned long check_time);
  42 int obdfs_flush_dirty_pages(unsigned long check_time);
  43
  44 /* namei.c */
  45
  46 /* rw.c */
  47 int obdfs_do_writepage(struct page *, int sync);
  48 int obdfs_init_pgrqcache(void);
  49 void obdfs_cleanup_pgrqcache(void);
  50 inline void obdfs_pgrq_del(struct obdfs_pgrq *pgrq);
  51 int obdfs_readpage(struct file *file, struct page *page);
  52 int obdfs_prepare_write(struct file *file, struct page *page, unsigned from, unsigned to);
  53 int obdfs_commit_write(struct file *file, struct page *page, unsigned from, unsigned to);
  54 int obdfs_writepage(struct page *page);
  55 struct page *obdfs_getpage(struct inode *inode, unsigned long offset,
  56                            int create, int locked);
  57 int obdfs_write_one_page(struct file *file, struct page *page,
  58                          unsigned long offset, unsigned long bytes,
  59                          const char * buf);
  60 int obdfs_do_vec_wr(struct inode **inodes, obd_count num_io, obd_count num_oa,
  61                     struct obdo **obdos, obd_count *oa_bufs,
  62                     struct page **pages, char **bufs, obd_size *counts,
  63                     obd_off *offsets, obd_flag *flags);
  64 void obdfs_truncate(struct inode *inode);
  65
  66 /* super.c */
  67 extern long obdfs_cache_count;
  68 extern long obdfs_mutex_start;
  69
  70 /* symlink.c */
  71 extern struct inode_operations obdfs_fast_symlink_inode_operations;
  72 extern struct inode_operations obdfs_symlink_inode_operations;
  73
  74 /* sysctl.c */
  75 void obdfs_sysctl_init(void);
  76 void obdfs_sysctl_clean(void);
  77
  78 static inline struct obdfs_sb_info *obdfs_i2sbi(struct inode *inode)
  79 {
  80         return (struct obdfs_sb_info *) &(inode->i_sb->u.generic_sbp);
  81 }
  82
  83 static inline struct list_head *obdfs_iplist(struct inode *inode)
  84 {
  85         struct obdfs_inode_info *info = obdfs_i2info(inode);
  86
  87         return &info->oi_pages;
  88 }
  89
  90 static inline struct list_head *obdfs_islist(struct inode *inode)
  91 {
  92         struct obdfs_inode_info *info = obdfs_i2info(inode);
  93
  94         return &info->oi_inodes;
  95 }
  96
  97 static inline struct list_head *obdfs_slist(struct inode *inode)
  98 {
  99         struct obdfs_sb_info *sbi = obdfs_i2sbi(inode);
 100
 101         return &sbi->osi_inodes;
 102 }
 103
 104 static void inline obdfs_set_size (struct inode *inode, obd_size size)
 105 {
 106        inode->i_size = size;
 107        inode->i_blocks = (inode->i_size + inode->i_sb->s_blocksize - 1) >>
 108                inode->i_sb->s_blocksize_bits;
 109 } /* obdfs_set_size */
 110
 111
 112 #if 0   /* PAGE CACHE DISABLED */
 113
 114 #define obd_down(mutex) {                                               \
 115         /* CDEBUG(D_INFO, "get lock\n"); */                             \
 116         obdfs_mutex_start = jiffies;                                    \
 117         down(mutex);                                                    \
 118         if (jiffies - obdfs_mutex_start)                                \
 119                 CDEBUG(D_CACHE, "waited on mutex %ld jiffies\n",        \
 120                        jiffies - obdfs_mutex_start);                    \
 121 }
 122
 123 #define obd_up(mutex) {                                                 \
 124         up(mutex);                                                      \
 125         if (jiffies - obdfs_mutex_start > 1)                            \
 126                 CDEBUG(D_CACHE, "held mutex for %ld jiffies\n",         \
 127                        jiffies - obdfs_mutex_start);                    \
 128         /* CDEBUG(D_INFO, "free lock\n"); */                            \
 129 }
 130
 131 /* We track if a page has been added to the OBD page cache by stting a
 132  * flag on the page.  We have chosen a bit that will hopefully not be
 133  * used for a while.
 134  */
 135 #define PG_obdcache 29
 136 #define OBDAddCachePage(page)   test_and_set_bit(PG_obdcache, &(page)->flags)
 137 #define OBDClearCachePage(page) clear_bit(PG_obdcache, &(page)->flags)
 138
 139 static inline void obdfs_print_plist(struct inode *inode)
 140 {
 141         struct list_head *page_list = obdfs_iplist(inode);
 142         struct list_head *tmp;
 143
 144         CDEBUG(D_INFO, "inode %ld: page", inode->i_ino);
 145         /* obd_down(&obdfs_i2sbi(inode)->osi_list_mutex); */
 146         if (list_empty(page_list)) {
 147                 CDEBUG(D_INFO, " list empty\n");
 148                 obd_up(&obdfs_i2sbi(inode)->osi_list_mutex);
 149                 return;
 150         }
 151
 152         tmp = page_list;
 153         while ( (tmp = tmp->next) != page_list) {
 154                 struct obdfs_pgrq *pgrq;
 155                 pgrq = list_entry(tmp, struct obdfs_pgrq, rq_plist);
 156                 CDEBUG(D_INFO, " %p", pgrq->rq_page);
 157         }
 158         CDEBUG(D_INFO, "\n");
 159         /* obd_up(&obdfs_i2sbi(inode)->osi_list_mutex); */
 160 }
 161 #endif
 162
 163
 164 #endif
 165