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
  19 /* super.c */
  20 struct obdfs_pgrq {
  21         struct list_head         rq_plist;      /* linked list of req's */
  22         unsigned long            rq_jiffies;
  23         struct page             *rq_page;       /* page to be written */
  24 };
  25
  26 struct list_head obdfs_super_list;       /* list of all OBDFS superblocks */
  27
  28
  29
  30 /* dir.c */
  31 #define EXT2_DIR_PAD                    4
  32 #define EXT2_DIR_ROUND                  (EXT2_DIR_PAD - 1)
  33 #define EXT2_DIR_REC_LEN(name_len)      (((name_len) + 8 + EXT2_DIR_ROUND) & \
  34                                          ~EXT2_DIR_ROUND)
  35 #define EXT2_NAME_LEN 255
  36 #if 0
  37 struct ext2_dir_entry_2 {
  38         __u32   inode;                  /* Inode number */
  39         __u16   rec_len;                /* Directory entry length */
  40         __u8    name_len;               /* Name length */
  41         __u8    file_type;
  42         char    name[EXT2_NAME_LEN];    /* File name */
  43 };
  44 #endif
  45 int obdfs_check_dir_entry (const char * function, struct inode * dir,
  46                           struct ext2_dir_entry_2 * de, struct page * page,
  47                           unsigned long offset);
  48 extern struct file_operations obdfs_dir_operations;
  49 extern struct inode_operations obdfs_dir_inode_operations;
  50
  51 /* file.c */
  52 extern struct file_operations obdfs_file_operations;
  53 extern struct inode_operations obdfs_file_inode_operations;
  54
  55 /* flush.c */
  56 void obdfs_dequeue_pages(struct inode *inode);
  57 int obdfs_flushd_init(void);
  58 int obdfs_flushd_cleanup(void);
  59 int obdfs_flush_reqs(struct list_head *inode_list, unsigned long check_time);
  60 int obdfs_flush_dirty_pages(unsigned long check_time);
  61
  62 /* namei.c */
  63 /*
  64  * Structure of the super block
  65  */
  66
  67 #if 0
  68 struct ext2_super_block {
  69         __u32   s_inodes_count;         /* Inodes count */
  70         __u32   s_blocks_count;         /* Blocks count */
  71         __u32   s_r_blocks_count;       /* Reserved blocks count */
  72         __u32   s_free_blocks_count;    /* Free blocks count */
  73         __u32   s_free_inodes_count;    /* Free inodes count */
  74         __u32   s_first_data_block;     /* First Data Block */
  75         __u32   s_log_block_size;       /* Block size */
  76         __s32   s_log_frag_size;        /* Fragment size */
  77         __u32   s_blocks_per_group;     /* # Blocks per group */
  78         __u32   s_frags_per_group;      /* # Fragments per group */
  79         __u32   s_inodes_per_group;     /* # Inodes per group */
  80         __u32   s_mtime;                /* Mount time */
  81         __u32   s_wtime;                /* Write time */
  82         __u16   s_mnt_count;            /* Mount count */
  83         __s16   s_max_mnt_count;        /* Maximal mount count */
  84         __u16   s_magic;                /* Magic signature */
  85         __u16   s_state;                /* File system state */
  86         __u16   s_errors;               /* Behaviour when detecting errors */
  87         __u16   s_minor_rev_level;      /* minor revision level */
  88         __u32   s_lastcheck;            /* time of last check */
  89         __u32   s_checkinterval;        /* max. time between checks */
  90         __u32   s_creator_os;           /* OS */
  91         __u32   s_rev_level;            /* Revision level */
  92         __u16   s_def_resuid;           /* Default uid for reserved blocks */
  93         __u16   s_def_resgid;           /* Default gid for reserved blocks */
  94         /*
  95          * These fields are for EXT2_DYNAMIC_REV superblocks only.
  96          *
  97          * Note: the difference between the compatible feature set and
  98          * the incompatible feature set is that if there is a bit set
  99          * in the incompatible feature set that the kernel doesn't
 100          * know about, it should refuse to mount the filesystem.
 101          *
 102          * e2fsck's requirements are more strict; if it doesn't know
 103          * about a feature in either the compatible or incompatible
 104          * feature set, it must abort and not try to meddle with
 105          * things it doesn't understand...
 106          */
 107         __u32   s_first_ino;            /* First non-reserved inode */
 108         __u16   s_inode_size;           /* size of inode structure */
 109         __u16   s_block_group_nr;       /* block group # of this superblock */
 110         __u32   s_feature_compat;       /* compatible feature set */
 111         __u32   s_feature_incompat;     /* incompatible feature set */
 112         __u32   s_feature_ro_compat;    /* readonly-compatible feature set */
 113         __u8    s_uuid[16];             /* 128-bit uuid for volume */
 114         char    s_volume_name[16];      /* volume name */
 115         char    s_last_mounted[64];     /* directory where last mounted */
 116         __u32   s_algorithm_usage_bitmap; /* For compression */
 117         /*
 118          * Performance hints.  Directory preallocation should only
 119          * happen if the EXT2_COMPAT_PREALLOC flag is on.
 120          */
 121         __u8    s_prealloc_blocks;      /* Nr of blocks to try to preallocate*/
 122         __u8    s_prealloc_dir_blocks;  /* Nr to preallocate for dirs */
 123         __u16   s_padding1;
 124         __u32   s_reserved[204];        /* Padding to the end of the block */
 125 };
 126 #endif
 127
 128 #define EXT2_SB(sb)     (&((sb)->u.ext2_sb))
 129 /*
 130  * Maximal count of links to a file
 131  */
 132 #define EXT2_LINK_MAX           32000
 133 /*
 134  * Ext2 directory file types.  Only the low 3 bits are used.  The
 135  * other bits are reserved for now.
 136  */
 137 #define EXT2_FT_UNKNOWN         0
 138 #define EXT2_FT_REG_FILE        1
 139 #define EXT2_FT_DIR             2
 140 #define EXT2_FT_CHRDEV          3
 141 #define EXT2_FT_BLKDEV          4
 142 #define EXT2_FT_FIFO            5
 143 #define EXT2_FT_SOCK            6
 144 #define EXT2_FT_SYMLINK         7
 145
 146 #define EXT2_FT_MAX             8
 147
 148 #define EXT2_BTREE_FL                   0x00001000 /* btree format dir */
 149 #define EXT2_RESERVED_FL                0x80000000 /* reserved for ext2 lib */
 150 #define EXT2_FEATURE_INCOMPAT_FILETYPE          0x0002
 151 #define EXT2_HAS_COMPAT_FEATURE(sb,mask)                        \
 152         ( EXT2_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) )
 153 #define EXT2_HAS_INCOMPAT_FEATURE(sb,mask)                      \
 154         ( EXT2_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) )
 155
 156 /* rw.c */
 157 int obdfs_do_writepage(struct page *, int sync);
 158 int obdfs_init_pgrqcache(void);
 159 void obdfs_cleanup_pgrqcache(void);
 160 inline void obdfs_pgrq_del(struct obdfs_pgrq *pgrq);
 161 int obdfs_readpage(struct file *file, struct page *page);
 162 int obdfs_prepare_write(struct file *file, struct page *page, unsigned from, unsigned to);
 163 int obdfs_commit_write(struct file *file, struct page *page, unsigned from, unsigned to);
 164 int obdfs_writepage(struct page *page);
 165 struct page *obdfs_getpage(struct inode *inode, unsigned long offset,
 166                            int create, int locked);
 167 int obdfs_write_one_page(struct file *file, struct page *page,
 168                          unsigned long offset, unsigned long bytes,
 169                          const char * buf);
 170 int obdfs_do_vec_wr(struct inode **inodes, obd_count num_io, obd_count num_oa,
 171                     struct obdo **obdos, obd_count *oa_bufs,
 172                     struct page **pages, char **bufs, obd_size *counts,
 173                     obd_off *offsets, obd_flag *flags);
 174 void obdfs_truncate(struct inode *inode);
 175
 176 /* super.c */
 177 extern long obdfs_cache_count;
 178 extern long obdfs_mutex_start;
 179
 180 /* symlink.c */
 181 extern struct inode_operations obdfs_fast_symlink_inode_operations;
 182 extern struct inode_operations obdfs_symlink_inode_operations;
 183
 184 /* sysctl.c */
 185 void obdfs_sysctl_init(void);
 186 void obdfs_sysctl_clean(void);
 187
 188 static inline struct obdfs_sb_info *obdfs_i2sbi(struct inode *inode)
 189 {
 190         return (struct obdfs_sb_info *) &(inode->i_sb->u.generic_sbp);
 191 }
 192
 193 static inline struct list_head *obdfs_iplist(struct inode *inode)
 194 {
 195         struct obdfs_inode_info *info = obdfs_i2info(inode);
 196
 197         return &info->oi_pages;
 198 }
 199
 200 static inline struct list_head *obdfs_islist(struct inode *inode)
 201 {
 202         struct obdfs_inode_info *info = obdfs_i2info(inode);
 203
 204         return &info->oi_inodes;
 205 }
 206
 207 static inline struct list_head *obdfs_slist(struct inode *inode)
 208 {
 209         struct obdfs_sb_info *sbi = obdfs_i2sbi(inode);
 210
 211         return &sbi->osi_inodes;
 212 }
 213
 214 static void inline obdfs_set_size (struct inode *inode, obd_size size)
 215 {
 216        inode->i_size = size;
 217        inode->i_blocks = (inode->i_size + inode->i_sb->s_blocksize - 1) >>
 218                inode->i_sb->s_blocksize_bits;
 219 } /* obdfs_set_size */
 220
 221
 222
 223 #define obd_down(mutex) {                                               \
 224         /* CDEBUG(D_INFO, "get lock\n"); */                             \
 225         obdfs_mutex_start = jiffies;                                    \
 226         down(mutex);                                                    \
 227         if (jiffies - obdfs_mutex_start)                                \
 228                 CDEBUG(D_CACHE, "waited on mutex %ld jiffies\n",        \
 229                        jiffies - obdfs_mutex_start);                    \
 230 }
 231
 232 #define obd_up(mutex) {                                                 \
 233         up(mutex);                                                      \
 234         if (jiffies - obdfs_mutex_start > 1)                            \
 235                 CDEBUG(D_CACHE, "held mutex for %ld jiffies\n",         \
 236                        jiffies - obdfs_mutex_start);                    \
 237         /* CDEBUG(D_INFO, "free lock\n"); */                            \
 238 }
 239
 240 /* We track if a page has been added to the OBD page cache by stting a
 241  * flag on the page.  We have chosen a bit that will hopefully not be
 242  * used for a while.
 243  */
 244 #define PG_obdcache 29
 245 #define OBDAddCachePage(page)   test_and_set_bit(PG_obdcache, &(page)->flags)
 246 #define OBDClearCachePage(page) clear_bit(PG_obdcache, &(page)->flags)
 247
 248 static inline void obdfs_print_plist(struct inode *inode)
 249 {
 250         struct list_head *page_list = obdfs_iplist(inode);
 251         struct list_head *tmp;
 252
 253         CDEBUG(D_INFO, "inode %ld: page", inode->i_ino);
 254         /* obd_down(&obdfs_i2sbi(inode)->osi_list_mutex); */
 255         if (list_empty(page_list)) {
 256                 CDEBUG(D_INFO, " list empty\n");
 257                 obd_up(&obdfs_i2sbi(inode)->osi_list_mutex);
 258                 return;
 259         }
 260
 261         tmp = page_list;
 262         while ( (tmp = tmp->next) != page_list) {
 263                 struct obdfs_pgrq *pgrq;
 264                 pgrq = list_entry(tmp, struct obdfs_pgrq, rq_plist);
 265                 CDEBUG(D_INFO, " %p", pgrq->rq_page);
 266         }
 267         CDEBUG(D_INFO, "\n");
 268         /* obd_up(&obdfs_i2sbi(inode)->osi_list_mutex); */
 269 }
 270 #include <linux/obdo.h>
 271
 272 #endif
 273