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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 <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
This commit is contained in:
Ferenc Havasi 2005-09-07 09:35:26 +01:00 • committed by Thomas Gleixner
commit e631ddba58
20 changed files with 1395 additions and 199 deletions
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13
fs/Kconfig
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@ -1050,6 +1050,19 @@ config JFFS2_FS_WRITEBUFFER
- NOR flash with transparent ECC
- DataFlash
config JFFS2_SUMMARY
bool "JFFS2 summary support (EXPERIMENTAL)"
depends on JFFS2_FS && EXPERIMENTAL
default n
help
This feature makes it possible to use summary information
for faster filesystem mount.
The summary information can be inserted into a filesystem image
by the utility 'sumtool'.
If unsure, say 'N'.
config JFFS2_COMPRESSION_OPTIONS
bool "Advanced compression options for JFFS2"
depends on JFFS2_FS