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

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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>
This commit is contained in:
Ferenc Havasi
2005-09-07 09:35:26 +01:00
committed by Thomas Gleixner
parent 1501787675
commit e631ddba58
20 changed files with 1409 additions and 213 deletions
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5
fs/jffs2/file.c
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@@ -7,7 +7,7 @@
*
* For licensing information, see the file 'LICENCE' in this directory.
*
* $Id: file.c,v 1.102 2005/07/06 12:13:09 dwmw2 Exp $
* $Id: file.c,v 1.103 2005/09/07 08:34:54 havasi Exp $
*
*/
@@ -134,7 +134,8 @@ static int jffs2_prepare_write (struct file *filp, struct page *pg,
D1(printk(KERN_DEBUG "Writing new hole frag 0x%x-0x%x between current EOF and new page\n",
(unsigned int)inode->i_size, pageofs));
ret = jffs2_reserve_space(c, sizeof(ri), &phys_ofs, &alloc_len, ALLOC_NORMAL);
ret = jffs2_reserve_space(c, sizeof(ri), &phys_ofs, &alloc_len,
ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
if (ret)
return ret;