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[fs/lustre-release.git] / lustre / kernel_patches / patches / snapfs_core-2.4.20.patch
index de6927d..60b27d0 100644 (file)
@@ -2,8 +2,8 @@
 Index: linux-2.4.20-8/fs/ext3/snap.c
 ===================================================================
 --- linux-2.4.20-8.orig/fs/ext3/snap.c 2003-01-30 18:24:37.000000000 +0800
-+++ linux-2.4.20-8/fs/ext3/snap.c      2004-01-16 20:38:50.000000000 +0800
-@@ -0,0 +1,2644 @@
++++ linux-2.4.20-8/fs/ext3/snap.c      2004-01-27 00:07:10.000000000 +0800
+@@ -0,0 +1,2577 @@
 +/* fs/ext3/snap.c
 + *
 + * Copyright (c) 2002 Cluster File Systems, Inc. <info@clusterfs.com>
@@ -46,6 +46,7 @@ Index: linux-2.4.20-8/fs/ext3/snap.c
 +#define EXT3_MAX_SNAP_DATA (sizeof(struct snap_ea))
 +#define EXT3_SNAP_INDEX EXT3_XATTR_INDEX_LUSTRE
 +
++#define EXT3_SNAP_DEBUG
 +#ifdef EXT3_SNAP_DEBUG
 +       #define snap_debug(f, a...)                             \
 +       do {                                                    \
@@ -227,9 +228,10 @@ Index: linux-2.4.20-8/fs/ext3/snap.c
 +/*SET FLAGS*/
 +extern int ext3_bmap(struct address_space *mapping, long block);
 +extern int ext3_load_inode_bitmap (struct super_block * sb, unsigned int block_group);
++extern int ext3_block_truncate_page(handle_t *handle, struct address_space *mapping, 
++                                  loff_t from);
 +/* helper functions to manipulate field 'parent' in snap_ea */
-+//static inline int
-+static int
++static inline int
 +set_parent_ino(struct snap_ea *pea, int size, int index, ino_t val)
 +{
 +       char * p = (char*) pea;
@@ -241,26 +243,6 @@ Index: linux-2.4.20-8/fs/ext3/snap.c
 +
 +       return 0;
 +}
-+static inline ino_t
-+get_parent_ino(struct snap_ea *pea, int size, int index)
-+{
-+       char * p = (char*)pea;
-+       int offset;
-+
-+       offset = sizeof(ino_t)*2 + (size - sizeof(ino_t)*2)/2;
-+       offset += sizeof(ino_t) * index;
-+       return *(ino_t*)(p+offset);
-+}
-+static inline void snap_double_lock(struct inode *i1, struct inode *i2)
-+{
-+      double_down(&i1->i_sem, &i2->i_sem);
-+}
-+
-+static inline void snap_double_unlock(struct inode *i1, struct inode *i2)
-+{
-+      double_up(&i1->i_sem, &i2->i_sem);
-+}
-+
 +/* ext3_iterate_cowed_inode:
 + *    iterate all the cowed inode with the same index and 
 + *  run the associate function @repeat
@@ -424,7 +406,7 @@ Index: linux-2.4.20-8/fs/ext3/snap.c
 +              lock_super(pri->i_sb);
 +              ext3_journal_get_write_access(handle, sbi->s_sbh);
 +              sbi->s_es->s_first_cowed_pri_ino = cpu_to_le32(pri->i_ino);
-+              SB_LAST_COWED_INO(pri->i_sb) = cpu_to_le32(pri->i_ino);
++              SB_FIRST_COWED_INO(pri->i_sb) = cpu_to_le32(pri->i_ino);
 +              pri->i_sb->s_dirt = 1;
 +              ext3_journal_dirty_metadata(handle, sbi->s_sbh);
 +              unlock_super(pri->i_sb);
@@ -515,7 +497,8 @@ Index: linux-2.4.20-8/fs/ext3/snap.c
 +      if (inode->i_ino == le32_to_cpu(SB_FIRST_COWED_INO(inode->i_sb))) {
 +              SB_FIRST_COWED_INO(inode->i_sb) = cpu_to_le32(next_ino); 
 +              EXT3_I(inode)->i_flags &= ~EXT3_SNAP_PRI_FLAG;
-+              
++              if (next_ino == 0)      
++                        SB_LAST_COWED_INO(inode->i_sb) = 0;
 +      } else {
 +              if (!prev_ino)  
 +                      goto err_exit;
@@ -673,7 +656,6 @@ Index: linux-2.4.20-8/fs/ext3/snap.c
 +               * Is it right in snapfs EXT3, check it later?
 +               */
 +              inlist = 0; 
-+      //      ea_size = SNAP_EA_SIZE_FROM_INDEX(index);
 +      } else if (err < 0 || err > EXT3_MAX_SNAP_DATA) {
 +              goto out_unlock;
 +      }
@@ -804,8 +786,20 @@ Index: linux-2.4.20-8/fs/ext3/snap.c
 +{
 +       return (EXT3_I(inode)->i_file_acl != 0);
 +}
++/* XXX This function has a very bad effect to 
++ * the performance of filesystem,
++ * will find another way to fix it 
++ */
++static void fs_flushinval_pages(handle_t *handle, struct inode* inode)
++{
++      if (inode->i_blocks > 0 && inode->i_mapping) { 
++              fsync_inode_data_buffers(inode);
++       //     ext3_block_truncate_page(handle, inode->i_mapping, inode->i_size);
++              truncate_inode_pages(inode->i_mapping, 0);
++      }
++}
 +
-+/* ext3_migrate_data:
++/* ext3_migrate_data2:
 + *  MOVE all the data blocks from inode src to inode dst as well as
 + *  COPY all attributes(meta data) from inode src to inode dst.
 + *  For extended attributes(EA), we COPY all the EAs but skip the Snap EA from src to dst.
@@ -826,6 +820,8 @@ Index: linux-2.4.20-8/fs/ext3/snap.c
 +      if (dst->i_ino == src->i_ino)
 +              return 0;
 +
++      fs_flushinval_pages(handle, src);
++      
 +      ext3_copy_meta(handle, dst, src);
 +
 +      snap_debug("migrating data blocks from %lu to %lu\n", src->i_ino, dst->i_ino);
@@ -857,7 +853,6 @@ Index: linux-2.4.20-8/fs/ext3/snap.c
 +        ext3_mark_inode_dirty(handle, src);
 +        ext3_mark_inode_dirty(handle, dst);
 +
-+      truncate_inode_pages(src->i_mapping, 0);
 +
 +      return SNAP_ERROR(err);
 +}
@@ -977,9 +972,7 @@ Index: linux-2.4.20-8/fs/ext3/snap.c
 +static int ext3_copy_block (struct inode *dst, struct inode *src, int blk) 
 +{
 +      struct buffer_head *bh_dst = NULL, *bh_src = NULL;
-+      struct page *dst_page = NULL, *src_page = NULL;
 +      int err = 0;
-+      int journal_data;
 +      handle_t *handle = NULL;
 +
 +      
@@ -987,91 +980,37 @@ Index: linux-2.4.20-8/fs/ext3/snap.c
 +      /* 
 +       * ext3_getblk() require handle!=NULL
 +       */
-+      journal_data = !S_ISREG(src->i_mode);
++      if (S_ISREG(src->i_mode))
++              return 0;
 +
-+      if (journal_data) {
-+              handle = ext3_journal_start(dst, SNAP_COPYBLOCK_TRANS_BLOCKS);
-+              if( !handle )
-+                      return -1;
++      handle = ext3_journal_start(dst, SNAP_COPYBLOCK_TRANS_BLOCKS);
++      if( !handle )
++              return -1;
 +
-+              bh_src = ext3_bread(handle, src, blk, 0, &err);
-+              if (!bh_src) {
-+                      snap_err("error for src blk %d, error %d\n", blk, err);
-+                      goto exit_relese;
-+              }
-+              bh_dst = ext3_getblk(handle, dst, blk, 1, &err);
-+              if (!bh_dst) {
-+                      snap_err("error for dst blk %d, error %d\n", blk, err);
-+                      err = -ENOSPC;
-+                      goto exit_relese;
-+              }
-+              snap_debug("copy block %lu to %lu (%ld bytes)\n",
-+                         bh_src->b_blocknr, bh_dst->b_blocknr, 
-+                         src->i_sb->s_blocksize);
++      bh_src = ext3_bread(handle, src, blk, 0, &err);
++      if (!bh_src) {
++              snap_err("error for src blk %d, error %d\n", blk, err);
++              goto exit_relese;
++      }
++      bh_dst = ext3_getblk(handle, dst, blk, 1, &err);
++      if (!bh_dst) {
++              snap_err("error for dst blk %d, error %d\n", blk, err);
++              err = -ENOSPC;
++              goto exit_relese;
++      }
++      snap_debug("copy block %lu to %lu (%ld bytes)\n",
++                 bh_src->b_blocknr, bh_dst->b_blocknr, 
++                 src->i_sb->s_blocksize);
 +
-+              ext3_journal_get_write_access(handle, bh_dst);
++      ext3_journal_get_write_access(handle, bh_dst);
 +
-+              memcpy(bh_dst->b_data, bh_src->b_data, src->i_sb->s_blocksize);
++      memcpy(bh_dst->b_data, bh_src->b_data, src->i_sb->s_blocksize);
 +
-+              ext3_journal_dirty_metadata(handle, bh_dst);
-+              err = 1;
++      ext3_journal_dirty_metadata(handle, bh_dst);
++      err = 1;
 +exit_relese:
-+              if (bh_src) brelse(bh_src);
-+              if (bh_dst) brelse(bh_dst);
-+      } else {
-+              /*copy block of reg file*/
-+              unsigned long bytes, index, offset; 
-+              struct address_space    *mapping = src->i_mapping;
-+
-+              offset = ((blk >> dst->i_sb->s_blocksize_bits) & (PAGE_CACHE_SIZE -1));
-+              index = (blk >> dst->i_sb->s_blocksize_bits) >> PAGE_CACHE_SHIFT; 
-+              bytes = dst->i_sb->s_blocksize;
-+              
-+              src_page = grab_cache_page(src->i_mapping, index);
-+              if (!src_page) {
-+                      snap_err("copy block %d from %lu to %lu ENOMEM \n",
-+                                blk, src->i_ino, dst->i_ino);
-+                      err = -ENOMEM;
-+                      goto exit;
-+              }
-+              ext3_readpage(NULL, src_page);
-+              wait_on_page(src_page);
-+              
-+              kmap(src_page);
-+              if (!Page_Uptodate(src_page)) {
-+                      snap_err("Can not read page index %lu of inode %lu\n",
-+                                index, src->i_ino);
-+                      err = -EIO;
-+                      goto unlock_src_page;
-+              }
-+              dst_page = grab_cache_page(dst->i_mapping, index);
-+              if (!dst_page) {
-+                      snap_err("copy block %d from %lu to %lu ENOMEM \n",
-+                                blk, src->i_ino, dst->i_ino);
-+                      err = -ENOMEM;
-+                      goto unlock_src_page;
-+              }       
-+              kmap(dst_page);
-+      
-+              err = mapping->a_ops->prepare_write(NULL, dst_page, offset, offset+bytes);
-+              if (err) 
-+                      goto unlock_dst_page; 
-+              memcpy(page_address(dst_page), page_address(src_page), bytes);
-+              flush_dcache_page(dst_page);
-+      
-+              err = mapping->a_ops->commit_write(NULL, dst_page, offset, offset+bytes);
-+              if (err) 
-+                      goto unlock_dst_page; 
-+              err = 1;
-+unlock_dst_page:
-+              kunmap(dst_page);
-+              UnlockPage(dst_page);
-+              page_cache_release(dst_page);
-+unlock_src_page:
-+              kunmap(src_page);
-+              page_cache_release(src_page);
-+      }
-+exit:
++      if (bh_src) brelse(bh_src);
++      if (bh_dst) brelse(bh_dst);
 +      if (handle)     
 +              ext3_journal_stop(handle, dst);
 +      return err;
@@ -1317,9 +1256,6 @@ Index: linux-2.4.20-8/fs/ext3/snap.c
 +      ext3_journal_stop(handle, pri);
 +}
 +
-+
-+
-+
 +static handle_t * ext3_copy_data(handle_t *handle, struct inode *dst,
 +                              struct inode *src, int *has_orphan)
 +{
@@ -1343,7 +1279,9 @@ Index: linux-2.4.20-8/fs/ext3/snap.c
 +                              snap_debug("create_indirect:fail to extend "
 +                                              "journal, restart trans\n");
 +                              loopfail( 3 );
-+                              if( !*has_orphan ){
++                              if(!*has_orphan) {
++                                      snap_debug("add orphan ino %lu nlink %d to orphan list \n", 
++                                                 dst->i_ino, dst->i_nlink); 
 +#ifdef EXT3_ENABLE_SNAP_ORPHAN
 +                                      add_snap_orphan(handle, dst, src);
 +#else
@@ -1543,9 +1481,11 @@ Index: linux-2.4.20-8/fs/ext3/snap.c
 +               * or ext3_rmdir will report errors "bad dir, no data blocks" 
 +               */
 +              if( S_ISDIR(pri->i_mode)) {
-+                      handle = ext3_copy_data( handle, pri, ind, &has_orphan );
-+                      if( !handle )
++                      handle = ext3_copy_data(handle, pri, ind, &has_orphan);
++                      if(!handle) {
++                              err = -EINVAL;
 +                              goto exit_unlock;
++                      }
 +              }
 +
 +              pri->u.ext3_i.i_flags |= EXT3_DEL_FL;
@@ -1582,17 +1522,15 @@ Index: linux-2.4.20-8/fs/ext3/snap.c
 +                       *    it has been cowed and has ea )
 +                       */
 +                        if( S_ISLNK(ind->i_mode) &&
-+                         (( ind->i_blocks == 0) || (ext3_has_ea(ind) && ind->i_blocks == bpib )) ){
-+                              snap_debug("ino %lu is fast symlink\n",
-+                                              pri->i_ino);
-+                              memcpy(EXT3_I(pri)->i_data,
-+                                      EXT3_I(ind)->i_data,
-+                                      sizeof(EXT3_I(ind)->i_data));
++                         ((ind->i_blocks == 0) || (ext3_has_ea(ind) && ind->i_blocks == bpib))) {
++                              snap_debug("ino %lu is fast symlink\n", pri->i_ino);
++                              memcpy(EXT3_I(pri)->i_data, EXT3_I(ind)->i_data,
++                                     sizeof(EXT3_I(ind)->i_data));
 +                              pri->i_size = ind->i_size;
 +                      }
 +                      else {
 +                              handle = ext3_copy_data(handle, pri, ind, &has_orphan);
-+                              if( !handle )
++                              if (!handle)
 +                                      goto exit_unlock;
 +                      }
 +              }
@@ -1620,7 +1558,9 @@ Index: linux-2.4.20-8/fs/ext3/snap.c
 +              pri->i_sb->s_dirt = 1;
 +              unlock_super(pri->i_sb);
 +      }
-+      if(has_orphan) {
++      if (has_orphan) {
++              snap_debug("del %lu nlink %d from orphan list\n", 
++                         ind->i_ino, ind->i_nlink);
 +#ifdef EXT3_ENABLE_SNAP_ORPHAN        
 +              remove_snap_orphan(handle, ind);
 +#else
@@ -1637,9 +1577,19 @@ Index: linux-2.4.20-8/fs/ext3/snap.c
 +      up(&ind->i_sem);
 +      ind->i_nlink = 0;
 +exit:
++      if (has_orphan) {
++              snap_debug("del %lu nlink %d from orphan list\n", 
++                         ind->i_ino, ind->i_nlink);
++#ifdef EXT3_ENABLE_SNAP_ORPHAN        
++              remove_snap_orphan(handle, ind);
++#else
++              ext3_orphan_del(handle, ind);
++#endif
++      }
 +      iput(ind);
 +      ext3_journal_stop(handle, pri);
-+      snap_debug("exiting with error %d\n", err);
++      if (err)
++              snap_err("exiting with error %d\n", err);
 +      return NULL;
 +}
 +
@@ -1954,59 +1904,58 @@ Index: linux-2.4.20-8/fs/ext3/snap.c
 +              return 0;
 +
 +      if( pri == pri->i_sb->u.ext3_sb.s_journal_inode ){
-+              printk( KERN_EMERG "TRY TO DESTROY JOURNAL'S IND\n");
++              snap_err("TRY TO DESTROY JOURNAL'S IND\n");
 +              return -EINVAL;
 +      }
 +
-+      handle = ext3_journal_start(pri, SNAP_DESTROY_TRANS_BLOCKS);
-+      if( !handle )
-+              return -EINVAL;
-+
 +      err = ext3_xattr_get(pri, EXT3_SNAP_INDEX, EXT3_SNAP_ATTR,
-+                                              buf, EXT3_MAX_SNAP_DATA);
++                           buf, EXT3_MAX_SNAP_DATA);
 +      if (err < 0) {
-+              if (err == -ENODATA)
-+                      snap_err("inode %lu is not a redirector\n", pri->i_ino);
-+              else
-+                      snap_err(EXT3_SNAP_ATTR " attribute read error\n");
-+              goto err_stop;
++              snap_err("inode %lu attribute read error\n", pri->i_ino);
++              return err;
 +      }
 +      
 +      snaps = (struct snap_ea *)buf;
 +      if ( !snaps->ino[index] ) {
 +              snap_err("for pri ino %lu, index %d, redirect ino is 0\n",
 +                              pri->i_ino, index);     
-+              err = -EINVAL;
-+              goto err_stop;
++              return -EINVAL;
 +      }
 +
 +      snap_debug("for pri ino %lu, reading inode %lu at index %d\n", 
 +              pri->i_ino, (ulong)le32_to_cpu(snaps->ino[index]), index);
 +
 +      ind = iget(pri->i_sb, le32_to_cpu (snaps->ino[index]) );
++
++      if ( !ind || IS_ERR(ind) || is_bad_inode(ind)) 
++              return  -EINVAL;
++
 +      snap_debug("iget ind %lu, ref count = %d\n", 
 +                 ind->i_ino, atomic_read(&ind->i_count));
 +
-+      if ( !ind || IS_ERR(ind) || is_bad_inode(ind) ) {
-+              err = -EINVAL;
-+              goto err_stop;
++      handle = ext3_journal_start(pri, SNAP_DESTROY_TRANS_BLOCKS);
++      if (!handle) {
++              iput(ind);
++              return -EINVAL;
 +      }
-+
 +      /* if it's block level cow, first copy the blocks back */       
 +      if (EXT3_HAS_COMPAT_FEATURE(pri->i_sb, EXT3_FEATURE_COMPAT_BLOCKCOW) &&
-+                      S_ISREG(pri->i_mode)) {
++          S_ISREG(pri->i_mode)) {
 +
 +              int blocks;
-+              if( !next_ind ) next_ind = pri;
++              if (!next_ind) {        
++                      next_ind = pri;
++                      down(&ind->i_sem);
++              } else {
++                      double_down(&next_ind->i_sem, &ind->i_sem);
++              }
 +              blocks = (next_ind->i_size + next_ind->i_sb->s_blocksize-1) 
 +                              >> next_ind->i_sb->s_blocksize_bits;
-+
 +#define FAST_MIGRATE_BLOCK
 +#ifdef FAST_MIGRATE_BLOCK
 +              snap_debug("migrate block back from ino %lu to %lu\n",
 +                              ind->i_ino, next_ind->i_ino);
 +
-+              snap_double_lock(next_ind, ind);
 +              for(i = 0; i < blocks; i++) {
 +                      if( ext3_bmap(next_ind->i_mapping, i) ) 
 +                              continue;
@@ -2019,36 +1968,22 @@ Index: linux-2.4.20-8/fs/ext3/snap.c
 +              next_ind->i_blocks = calculate_i_blocks( next_ind, blocks);
 +              ext3_mark_inode_dirty(handle, next_ind);
 +
-+              snap_double_unlock(next_ind, ind);
-+
-+#if 0
-+              snap_double_lock(pri, ind);
-+
-+              for(i = 0; i < blocks; i++) { 
-+                      if( ext3_bmap(pri, i) ) continue;
-+                      if( !ext3_bmap(ind, i) ) continue;
-+                      ext3_migrate_block( pri, ind, i) ;
-+              }
-+              /* Now re-compute the i_blocks */
-+              /* XXX shall we take care of ind here? probably not */
-+              pri->i_blocks = calculate_i_blocks( pri, blocks);
-+              mark_inode_dirty(pri);
-+
-+              double_unlock(pri, ind);
-+#endif
 +#else
-+              snap_double_lock(next_ind, ind);
 +              for (i = 0; i < blocks; i++) {
-+                      if (ext3_bmap (next_ind->i_mapping, i) )        
++                      if (ext3_bmap(next_ind->i_mapping, i))  
 +                              continue;
-+                      if (ext3_copy_block (next_ind, ind, i ) < 0)    break;
++                      if (ext3_copy_block(next_ind, ind, i ) < 0)     
++                              break;
 +              }
 +              ext3_mark_inode_dirty(handle, next_ind);
-+              double_unlock(next_ind, ind);
-+
 +#endif 
-+      }
++              if (next_ind == pri) 
++                      up(&ind->i_sem);
++              else 
++                      double_up(&next_ind->i_sem, &ind->i_sem);
 +
++      }
++      
 +      snap_debug("delete indirect ino %lu\n", ind->i_ino);
 +      snap_debug("iput ind %lu, ref count = %d\n", 
 +                  ind->i_ino, atomic_read(&ind->i_count));
@@ -2118,7 +2053,6 @@ Index: linux-2.4.20-8/fs/ext3/snap.c
 +              pri->i_ctime = ctime;
 +              ext3_mark_inode_dirty(handle, pri);
 +      }
-+err_stop:
 +      ext3_journal_stop(handle, pri);
 +      return err;
 +}
@@ -2154,23 +2088,22 @@ Index: linux-2.4.20-8/fs/ext3/snap.c
 +      /* XXX: check this, ext3_new_inode, the first arg should be "dir" */ 
 +      tmp = ext3_new_inode(handle, pri, (int)pri->i_mode, 0);
 +      if(tmp) {
-+              snap_double_lock(pri, tmp);
++              double_down(&pri->i_sem, &tmp->i_sem);
 +              ext3_migrate_data(handle, tmp, pri);
-+              snap_double_unlock(pri, tmp);
++              double_up(&pri->i_sem, &tmp->i_sem);
 +
 +              tmp->i_nlink = 0;
 +              iput(tmp);      
 +      }
 +      else    
 +              snap_err("restore_indirect, new_inode err\n");
-+
-+      snap_double_lock(pri, ind);
++      
++      double_down(&pri->i_sem, &ind->i_sem);
 +      ext3_migrate_data(handle, pri, ind);
 +      /* clear the cow flag for pri because ind has it */
 +      pri->u.ext3_i.i_flags &= ~EXT3_COW_FL;
 +      ext3_mark_inode_dirty(handle, pri);
-+      snap_double_unlock(pri, ind);
-+
++      double_up(&pri->i_sem, &ind->i_sem);
 +      iput(ind);
 +
 +//    ext3_destroy_indirect(pri, index);
@@ -2650,8 +2583,8 @@ Index: linux-2.4.20-8/fs/ext3/snap.c
 +
 Index: linux-2.4.20-8/fs/ext3/Makefile
 ===================================================================
---- linux-2.4.20-8.orig/fs/ext3/Makefile       2004-01-05 10:54:03.000000000 +0800
-+++ linux-2.4.20-8/fs/ext3/Makefile    2004-01-13 00:10:14.000000000 +0800
+--- linux-2.4.20-8.orig/fs/ext3/Makefile       2004-01-19 22:06:25.000000000 +0800
++++ linux-2.4.20-8/fs/ext3/Makefile    2004-01-19 22:06:25.000000000 +0800
 @@ -13,7 +13,7 @@
  
  obj-y    := balloc.o bitmap.o dir.o file.o fsync.o ialloc.o inode.o iopen.o \
@@ -2663,8 +2596,8 @@ Index: linux-2.4.20-8/fs/ext3/Makefile
  export-objs += xattr.o
 Index: linux-2.4.20-8/fs/ext3/inode.c
 ===================================================================
---- linux-2.4.20-8.orig/fs/ext3/inode.c        2004-01-05 10:54:03.000000000 +0800
-+++ linux-2.4.20-8/fs/ext3/inode.c     2004-01-16 20:39:21.000000000 +0800
+--- linux-2.4.20-8.orig/fs/ext3/inode.c        2004-01-19 22:06:24.000000000 +0800
++++ linux-2.4.20-8/fs/ext3/inode.c     2004-01-26 01:12:48.000000000 +0800
 @@ -1191,7 +1191,7 @@
   * So, if we see any bmap calls here on a modified, data-journaled file,
   * take extra steps to flush any blocks which might be in the cache. 
@@ -2674,19 +2607,19 @@ Index: linux-2.4.20-8/fs/ext3/inode.c
  {
        struct inode *inode = mapping->host;
        journal_t *journal;
-@@ -1367,7 +1367,7 @@
-       return ret;
- }
--static int ext3_readpage(struct file *file, struct page *page)
-+int ext3_readpage(struct file *file, struct page *page)
+@@ -1403,7 +1403,7 @@
+  * This required during truncate. We need to physically zero the tail end
+  * of that block so it doesn't yield old data if the file is later grown.
+  */
+-static int ext3_block_truncate_page(handle_t *handle,
++int ext3_block_truncate_page(handle_t *handle,
+               struct address_space *mapping, loff_t from)
  {
-       return block_read_full_page(page,ext3_get_block);
- }
+       unsigned long index = from >> PAGE_CACHE_SHIFT;
 Index: linux-2.4.20-8/fs/ext3/ialloc.c
 ===================================================================
---- linux-2.4.20-8.orig/fs/ext3/ialloc.c       2004-01-05 10:54:03.000000000 +0800
-+++ linux-2.4.20-8/fs/ext3/ialloc.c    2004-01-16 20:48:29.000000000 +0800
+--- linux-2.4.20-8.orig/fs/ext3/ialloc.c       2004-01-19 22:06:24.000000000 +0800
++++ linux-2.4.20-8/fs/ext3/ialloc.c    2004-01-19 22:06:25.000000000 +0800
 @@ -160,6 +160,13 @@
        return retval;
  }
@@ -2701,10 +2634,42 @@ Index: linux-2.4.20-8/fs/ext3/ialloc.c
  /*
   * NOTE! When we get the inode, we're the only people
   * that have access to it, and as such there are no
+Index: linux-2.4.20-8/fs/ext3/super.c
+===================================================================
+--- linux-2.4.20-8.orig/fs/ext3/super.c        2004-01-19 22:06:24.000000000 +0800
++++ linux-2.4.20-8/fs/ext3/super.c     2004-01-19 22:06:25.000000000 +0800
+@@ -1324,6 +1324,13 @@
+       sbi->s_mount_state = le16_to_cpu(es->s_state);
+       sbi->s_addr_per_block_bits = log2(EXT3_ADDR_PER_BLOCK(sb));
+       sbi->s_desc_per_block_bits = log2(EXT3_DESC_PER_BLOCK(sb));
++#define EXT3_SNAP_FS
++#ifdef EXT3_SNAP_FS
++      init_MUTEX(&(sbi->s_snap_list_sem));
++      sbi->s_snaptable_ino = le32_to_cpu(es->s_snaptable_ino);
++      sbi->s_first_cowed_pri_ino = le32_to_cpu(es->s_first_cowed_pri_ino);
++      sbi->s_last_cowed_pri_ino = le32_to_cpu(es->s_last_cowed_pri_ino);
++#endif        
+       for (i=0; i < 4; i++)
+               sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
+       sbi->s_def_hash_version = es->s_def_hash_version;
+Index: linux-2.4.20-8/fs/ext3/ext3-exports.c
+===================================================================
+--- linux-2.4.20-8.orig/fs/ext3/ext3-exports.c 2004-01-19 22:06:19.000000000 +0800
++++ linux-2.4.20-8/fs/ext3/ext3-exports.c      2004-01-26 01:13:53.000000000 +0800
+@@ -21,6 +21,9 @@
+ EXPORT_SYMBOL(ext3_xattr_set);
+ EXPORT_SYMBOL(ext3_prep_san_write);
+ EXPORT_SYMBOL(ext3_map_inode_page);
++EXPORT_SYMBOL(ext3_orphan_add);
++EXPORT_SYMBOL(ext3_orphan_del);
++EXPORT_SYMBOL(ext3_block_truncate_page)
+ EXPORT_SYMBOL(ext3_abort);
+ EXPORT_SYMBOL(ext3_decode_error);
 Index: linux-2.4.20-8/include/linux/snap.h
 ===================================================================
 --- linux-2.4.20-8.orig/include/linux/snap.h   2003-01-30 18:24:37.000000000 +0800
-+++ linux-2.4.20-8/include/linux/snap.h        2004-01-13 00:10:14.000000000 +0800
++++ linux-2.4.20-8/include/linux/snap.h        2004-01-19 22:11:26.000000000 +0800
 @@ -0,0 +1,266 @@
 +/*
 + * Copyright (c) 2002 Cluster File Systems, Inc. <info@clusterfs.com>
@@ -2974,8 +2939,8 @@ Index: linux-2.4.20-8/include/linux/snap.h
 +#endif
 Index: linux-2.4.20-8/include/linux/ext3_fs.h
 ===================================================================
---- linux-2.4.20-8.orig/include/linux/ext3_fs.h        2004-01-05 10:54:03.000000000 +0800
-+++ linux-2.4.20-8/include/linux/ext3_fs.h     2004-01-16 20:45:09.000000000 +0800
+--- linux-2.4.20-8.orig/include/linux/ext3_fs.h        2004-01-19 22:06:24.000000000 +0800
++++ linux-2.4.20-8/include/linux/ext3_fs.h     2004-01-19 22:11:15.000000000 +0800
 @@ -183,7 +183,13 @@
  #define EXT3_INDEX_FL                 0x00001000 /* hash-indexed directory */
  #define EXT3_IMAGIC_FL                        0x00002000 /* AFS directory */
@@ -3047,8 +3012,8 @@ Index: linux-2.4.20-8/include/linux/ext3_fs.h
                                         EXT3_FEATURE_INCOMPAT_RECOVER)
 Index: linux-2.4.20-8/include/linux/ext3_fs_sb.h
 ===================================================================
---- linux-2.4.20-8.orig/include/linux/ext3_fs_sb.h     2004-01-05 10:54:00.000000000 +0800
-+++ linux-2.4.20-8/include/linux/ext3_fs_sb.h  2004-01-13 00:10:14.000000000 +0800
+--- linux-2.4.20-8.orig/include/linux/ext3_fs_sb.h     2004-01-19 22:06:18.000000000 +0800
++++ linux-2.4.20-8/include/linux/ext3_fs_sb.h  2004-01-19 22:10:06.000000000 +0800
 @@ -86,6 +86,13 @@
        wait_queue_head_t s_delete_thread_queue;
        wait_queue_head_t s_delete_waiter_queue;
@@ -3065,8 +3030,8 @@ Index: linux-2.4.20-8/include/linux/ext3_fs_sb.h
  #endif        /* _LINUX_EXT3_FS_SB */
 Index: linux-2.4.20-8/include/linux/ext3_jbd.h
 ===================================================================
---- linux-2.4.20-8.orig/include/linux/ext3_jbd.h       2004-01-05 10:53:59.000000000 +0800
-+++ linux-2.4.20-8/include/linux/ext3_jbd.h    2004-01-13 00:10:14.000000000 +0800
+--- linux-2.4.20-8.orig/include/linux/ext3_jbd.h       2004-01-19 22:06:15.000000000 +0800
++++ linux-2.4.20-8/include/linux/ext3_jbd.h    2004-01-19 22:11:15.000000000 +0800
 @@ -71,6 +71,33 @@
  
  #define EXT3_INDEX_EXTRA_TRANS_BLOCKS 8
@@ -3104,12 +3069,14 @@ Index: linux-2.4.20-8/include/linux/ext3_jbd.h
 
 %diffstat
  fs/ext3/Makefile           |    2 
+ fs/ext3/ext3-exports.c     |    3 
  fs/ext3/ialloc.c           |    7 
  fs/ext3/inode.c            |    4 
- fs/ext3/snap.c             | 2644 +++++++++++++++++++++++++++++++++++++++++++++
+ fs/ext3/snap.c             | 2577 +++++++++++++++++++++++++++++++++++++++++++++
+ fs/ext3/super.c            |    7 
  include/linux/ext3_fs.h    |   38 
  include/linux/ext3_fs_sb.h |    7 
  include/linux/ext3_jbd.h   |   27 
  include/linux/snap.h       |  266 ++++
8 files changed, 2989 insertions(+), 6 deletions(-)
10 files changed, 2932 insertions(+), 6 deletions(-)