[JFFS2] Add erase block summary support (mount time improvement)

The goal of summary is to speed up the mount time. Erase block summary (EBS)
stores summary information at the end of every (closed) erase block. It is
no longer necessary to scan all nodes separetly (and read all pages of them)
just read this "small" summary, where every information is stored which is
needed at mount time.

This summary information is stored in a JFFS2_FEATURE_RWCOMPAT_DELETE. During
the mount process if there is no summary info the orignal scan process will
be executed. EBS works with NAND and NOR flashes, too.

There is a user space tool called sumtool to generate this summary
information for a JFFS2 image.

Signed-off-by: Ferenc Havasi <havasi@inf.u-szeged.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 13 insertions, 7 deletions

diff --git a/fs/jffs2/dir.c b/fs/jffs2/dir.c
index 0fd15aaf2458..19bea0f95ac1 100644
--- a/fs/jffs2/dir.c
+++ b/fs/jffs2/dir.c
@@ -7,7 +7,7 @@
  *
  * For licensing information, see the file 'LICENCE' in this directory.
  *
- * $Id: dir.c,v 1.88 2005/08/17 13:46:22 dedekind Exp $
+ * $Id: dir.c,v 1.89 2005/09/07 08:34:54 havasi Exp $
  *
  */
 
@@ -310,7 +310,8 @@ static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char
          * Just the node will do for now, though 
          */
         namelen = dentry->d_name.len;
-        ret = jffs2_reserve_space(c, sizeof(*ri) + targetlen, &phys_ofs, &alloclen, ALLOC_NORMAL);
+        ret = jffs2_reserve_space(c, sizeof(*ri) + targetlen, &phys_ofs, &alloclen,
+                                ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
 
         if (ret) {
                 jffs2_free_raw_inode(ri);
@@ -370,7 +371,8 @@ static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char
         up(&f->sem);
 
         jffs2_complete_reservation(c);
-        ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen, ALLOC_NORMAL);
+        ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen,
+                                ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
         if (ret) {
                 /* Eep. */
                 jffs2_clear_inode(inode);
@@ -455,7 +457,8 @@ static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, int mode)
          * Just the node will do for now, though 
          */
         namelen = dentry->d_name.len;
-        ret = jffs2_reserve_space(c, sizeof(*ri), &phys_ofs, &alloclen, ALLOC_NORMAL);
+        ret = jffs2_reserve_space(c, sizeof(*ri), &phys_ofs, &alloclen, ALLOC_NORMAL,
+                                JFFS2_SUMMARY_INODE_SIZE);
 
         if (ret) {
                 jffs2_free_raw_inode(ri);
@@ -498,7 +501,8 @@ static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, int mode)
         up(&f->sem);
 
         jffs2_complete_reservation(c);
-        ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen, ALLOC_NORMAL);
+        ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen,
+                                ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
         if (ret) {
                 /* Eep. */
                 jffs2_clear_inode(inode);
@@ -607,7 +611,8 @@ static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, int mode, de
          * Just the node will do for now, though 
          */
         namelen = dentry->d_name.len;
-        ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &phys_ofs, &alloclen, ALLOC_NORMAL);
+        ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &phys_ofs, &alloclen,
+                                ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
 
         if (ret) {
                 jffs2_free_raw_inode(ri);
@@ -652,7 +657,8 @@ static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, int mode, de
         up(&f->sem);
 
         jffs2_complete_reservation(c);
-        ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen, ALLOC_NORMAL);
+        ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen,
+                                ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
         if (ret) {
                 /* Eep. */
                 jffs2_clear_inode(inode);