patch-2.4.15 linux/fs/intermezzo/journal_ext3.c

• Lines: 206
• Date: Sun Nov 11 10:20:21 2001
• Orig file: v2.4.14/linux/fs/intermezzo/journal_ext3.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.14/linux/fs/intermezzo/journal_ext3.c linux/fs/intermezzo/journal_ext3.c
@@ -0,0 +1,205 @@
+
+/*
+ * Intermezzo. (C) 1998 Peter J. Braam
+ * Intermezzo. (C) 2000 Red Hat, Inc.
+ * Intermezzo. (C) 2000 Los Alamos National Laboratory
+ * Intermezzo. (C) 2000 TurboLinux, Inc.
+ * Intermezzo. (C) 2001 Mountain View Data, Inc.
+ */
+
+#include <linux/types.h>
+#include <linux/param.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/smp_lock.h>
+#if defined(CONFIG_EXT3_FS) || defined (CONFIG_EXT3_FS_MODULE)
+#include <linux/jbd.h>
+#include <linux/ext3_fs.h>
+#include <linux/ext3_jbd.h>
+#endif
+
+#include <linux/intermezzo_fs.h>
+#include <linux/intermezzo_upcall.h>
+#include <linux/intermezzo_psdev.h>
+#include <linux/intermezzo_kml.h>
+
+#if defined(CONFIG_EXT3_FS) || defined (CONFIG_EXT3_FS_MODULE)
+
+#define MAX_PATH_BLOCKS(inode) (PATH_MAX >> EXT3_BLOCK_SIZE_BITS((inode)->i_sb))
+#define MAX_NAME_BLOCKS(inode) (NAME_MAX >> EXT3_BLOCK_SIZE_BITS((inode)->i_sb))
+
+/* space requirements: 
+   presto_do_truncate: 
+        used to truncate the KML forward to next fset->chunksize boundary
+          - zero partial block
+          - update inode
+   presto_write_record: 
+        write header (< one block) 
+        write one path (< MAX_PATHLEN) 
+        possibly write another path (< MAX_PATHLEN)
+        write suffix (< one block) 
+   presto_update_last_rcvd
+        write one block
+*/
+
+static loff_t presto_e3_freespace(struct presto_cache *cache,
+                                         struct super_block *sb)
+{
+        loff_t freebl = le32_to_cpu(sb->u.ext3_sb.s_es->s_free_blocks_count);
+        loff_t avail =   freebl - 
+                le32_to_cpu(sb->u.ext3_sb.s_es->s_r_blocks_count);
+        return (avail <<  EXT3_BLOCK_SIZE_BITS(sb));
+}
+
+/* start the filesystem journal operations */
+static void *presto_e3_trans_start(struct presto_file_set *fset, 
+                                   struct inode *inode, 
+                                   int op)
+{
+        int jblocks;
+        int trunc_blks, one_path_blks, extra_path_blks, 
+                extra_name_blks, lml_blks; 
+        __u32 avail_kmlblocks;
+        handle_t *handle;
+
+        if ( presto_no_journal(fset) ||
+             strcmp(fset->fset_cache->cache_type, "ext3"))
+          {
+            CDEBUG(D_JOURNAL, "got cache_type \"%s\"\n",
+                   fset->fset_cache->cache_type);
+            return NULL;
+          }
+
+        avail_kmlblocks = inode->i_sb->u.ext3_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);
+        }            
+
+        /* Need journal space for:
+             at least three writes to KML (two one block writes, one a path) 
+             possibly a second name (unlink, rmdir)
+             possibly a second path (symlink, rename)
+             a one block write to the last rcvd file 
+        */
+
+        trunc_blks = EXT3_DATA_TRANS_BLOCKS + 1; 
+        one_path_blks = 4*EXT3_DATA_TRANS_BLOCKS + MAX_PATH_BLOCKS(inode) + 3;
+        lml_blks = 4*EXT3_DATA_TRANS_BLOCKS + MAX_PATH_BLOCKS(inode) + 2;
+        extra_path_blks = EXT3_DATA_TRANS_BLOCKS + MAX_PATH_BLOCKS(inode); 
+        extra_name_blks = EXT3_DATA_TRANS_BLOCKS + MAX_NAME_BLOCKS(inode); 
+
+        /* additional blocks appear for "two pathname" operations
+           and operations involving the LML records 
+        */
+        switch (op) {
+        case PRESTO_OP_TRUNC:
+                jblocks = one_path_blks + extra_name_blks + trunc_blks
+                        + EXT3_DELETE_TRANS_BLOCKS; 
+                break;
+        case PRESTO_OP_RELEASE:
+                /* 
+                jblocks = one_path_blks + lml_blks + 2*trunc_blks; 
+                */
+                jblocks = one_path_blks; 
+                break;
+        case PRESTO_OP_SETATTR:
+                jblocks = one_path_blks + trunc_blks + 1 ; 
+                break;
+        case PRESTO_OP_CREATE:
+                jblocks = one_path_blks + trunc_blks 
+                        + EXT3_DATA_TRANS_BLOCKS + 3 + 2; 
+                break;
+        case PRESTO_OP_LINK:
+                jblocks = one_path_blks + trunc_blks 
+                        + EXT3_DATA_TRANS_BLOCKS + 2; 
+                break;
+        case PRESTO_OP_UNLINK:
+                jblocks = one_path_blks + extra_name_blks + trunc_blks
+                        + EXT3_DELETE_TRANS_BLOCKS + 2; 
+                break;
+        case PRESTO_OP_SYMLINK:
+                jblocks = one_path_blks + extra_path_blks + trunc_blks
+                        + EXT3_DATA_TRANS_BLOCKS + 5; 
+                break;
+        case PRESTO_OP_MKDIR:
+                jblocks = one_path_blks + trunc_blks
+                        + EXT3_DATA_TRANS_BLOCKS + 4 + 2;
+                break;
+        case PRESTO_OP_RMDIR:
+                jblocks = one_path_blks + extra_name_blks + trunc_blks
+                        + EXT3_DELETE_TRANS_BLOCKS + 1; 
+                break;
+        case PRESTO_OP_MKNOD:
+                jblocks = one_path_blks + trunc_blks + 
+                        EXT3_DATA_TRANS_BLOCKS + 3 + 2;
+                break;
+        case PRESTO_OP_RENAME:
+                jblocks = one_path_blks + extra_path_blks + trunc_blks + 
+                        2 * EXT3_DATA_TRANS_BLOCKS + 2 + 3;
+                break;
+        case PRESTO_OP_WRITE:
+                jblocks = one_path_blks; 
+                /*  add this when we can wrap our transaction with 
+                    that of ext3_file_write (ordered writes)
+                    +  EXT3_DATA_TRANS_BLOCKS;
+                */
+                break;
+        default:
+                CDEBUG(D_JOURNAL, "invalid operation %d for journal\n", op);
+                return NULL;
+        }
+
+        CDEBUG(D_JOURNAL, "creating journal handle (%d blocks)\n", jblocks);
+        /* journal_start/stop does not do its own locking while updating
+         * the handle/transaction information. Hence we create our own
+         * critical section to protect these calls. -SHP
+         */
+        lock_kernel();
+        handle = journal_start(EXT3_JOURNAL(inode), jblocks);
+        unlock_kernel();
+        return handle;
+}
+
+void presto_e3_trans_commit(struct presto_file_set *fset, void *handle)
+{
+        if ( presto_no_journal(fset) || !handle)
+                return;
+
+        /* See comments before journal_start above. -SHP */
+        lock_kernel();
+        journal_stop(handle);
+        unlock_kernel();
+}
+
+void presto_e3_journal_file_data(struct inode *inode)
+{
+#ifdef EXT3_JOURNAL_DATA_FL
+        inode->u.ext3_i.i_flags |= EXT3_JOURNAL_DATA_FL;
+#else
+#warning You must have a facility to enable journaled writes for recovery!
+#endif
+}
+
+struct journal_ops presto_ext3_journal_ops = {
+        tr_avail: presto_e3_freespace,
+        tr_start:  presto_e3_trans_start,
+        tr_commit: presto_e3_trans_commit,
+        tr_journal_data: presto_e3_journal_file_data
+};
+
+#endif /* CONFIG_EXT3_FS */