-void ext2_discard_prealloc (struct inode * inode)
-{
-#ifdef EXT2_PREALLOCATE
- struct ext2_inode_info *ei = EXT2_I(inode);
- write_lock(&ei->i_meta_lock);
- if (ei->i_prealloc_count) {
- unsigned short total = ei->i_prealloc_count;
- unsigned long block = ei->i_prealloc_block;
- ei->i_prealloc_count = 0;
- ei->i_prealloc_block = 0;
- write_unlock(&ei->i_meta_lock);
- ext2_free_blocks (inode, block, total);
- return;
- } else
- write_unlock(&ei->i_meta_lock);
-#endif
-}
-
-static int ext2_alloc_block (struct inode * inode, unsigned long goal, int *err)
-{
-#ifdef EXT2FS_DEBUG
- static unsigned long alloc_hits, alloc_attempts;
-#endif
- unsigned long result;
-
-
-#ifdef EXT2_PREALLOCATE
- struct ext2_inode_info *ei = EXT2_I(inode);
- write_lock(&ei->i_meta_lock);
- if (ei->i_prealloc_count &&
- (goal == ei->i_prealloc_block || goal + 1 == ei->i_prealloc_block))
- {
- result = ei->i_prealloc_block++;
- ei->i_prealloc_count--;
- write_unlock(&ei->i_meta_lock);
- ext2_debug ("preallocation hit (%lu/%lu).\n",
- ++alloc_hits, ++alloc_attempts);
- } else {
- write_unlock(&ei->i_meta_lock);
- ext2_discard_prealloc (inode);
- ext2_debug ("preallocation miss (%lu/%lu).\n",
- alloc_hits, ++alloc_attempts);
- if (S_ISREG(inode->i_mode))
- result = ext2_new_block (inode, goal,
- &ei->i_prealloc_count,
- &ei->i_prealloc_block, err);
- else
- result = ext2_new_block(inode, goal, NULL, NULL, err);
- }
-#else
- result = ext2_new_block (inode, goal, 0, 0, err);
-#endif
- return result;
-}
-