patch-2.4.15 linux/fs/intermezzo/journal_ext2.c

• Lines: 71
• Date: Sun Nov 11 10:20:21 2001
• Orig file: v2.4.14/linux/fs/intermezzo/journal_ext2.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.14/linux/fs/intermezzo/journal_ext2.c linux/fs/intermezzo/journal_ext2.c
@@ -0,0 +1,70 @@
+
+/*
+ * Intermezzo. (C) 1998 Peter J. Braam
+ */
+
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/fs.h>
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
+#include <linux/stat.h>
+#include <linux/errno.h>
+#include <linux/locks.h>
+#include <asm/segment.h>
+#include <asm/uaccess.h>
+#include <linux/string.h>
+#include <linux/ext2_fs.h> 
+
+#include <linux/intermezzo_fs.h>
+#include <linux/intermezzo_upcall.h>
+#include <linux/intermezzo_psdev.h>
+#include <linux/intermezzo_kml.h>
+
+#if defined(CONFIG_EXT2_FS)
+
+/* EXT2 has no journalling, so these functions do nothing */
+static loff_t presto_e2_freespace(struct presto_cache *cache,
+                                         struct super_block *sb)
+{
+        unsigned long freebl = le32_to_cpu(sb->u.ext2_sb.s_es->s_free_blocks_count);
+        unsigned long avail =   freebl - le32_to_cpu(sb->u.ext2_sb.s_es->s_r_blocks_count);
+	return (avail <<  EXT2_BLOCK_SIZE_BITS(sb));
+}
+
+/* start the filesystem journal operations */
+static void *presto_e2_trans_start(struct presto_file_set *fset, struct inode *inode, int op)
+{
+        __u32 avail_kmlblocks;
+
+        if ( presto_no_journal(fset) ||
+             strcmp(fset->fset_cache->cache_type, "ext2"))
+                return NULL;
+
+        avail_kmlblocks = inode->i_sb->u.ext2_sb.s_es->s_free_blocks_count;
+        
+        if ( avail_kmlblocks < 3 ) {
+                return ERR_PTR(-ENOSPC);
+        }
+        
+        if (  (op != PRESTO_OP_UNLINK && op != PRESTO_OP_RMDIR)
+              && avail_kmlblocks < 6 ) {
+                return ERR_PTR(-ENOSPC);
+        }            
+	return (void *) 1;
+}
+
+static void presto_e2_trans_commit(struct presto_file_set *fset, void *handle)
+{
+  do {} while (0);
+}
+
+struct journal_ops presto_ext2_journal_ops = {
+        tr_avail: presto_e2_freespace,
+        tr_start: presto_e2_trans_start,
+        tr_commit: presto_e2_trans_commit,
+        tr_journal_data: NULL
+};
+
+#endif /* CONFIG_EXT2_FS */