[patch #1798] [Patch #1798] Fixes dir. dependancy and refcnt locking problem

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Patch #1798 has been updated. 

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Category: None
Status: Open
Summary: Fixes dir. dependancy and refcnt locking problem

Follow-Ups:

Date: Tue 08/05/2003 at 23:23
By: marco_g

Comment:
This patch fixes Task #2489: "diskfs_node_refcnt_lock can be locked while 
write_node tries to lock it."

Fatfs depends a lot on the directory of a file. It is opened every time when it 
reads from or writes to a file. This effect is recursively. It slows down fatfs 
and introduces some problems like this locking problem.

I fixed this by adding a dependency to the directory for all opened files and I 
let every file hold a reference to that directory. Now fatfs consumes a bit 
more memory but that is much better than the currect situation because looking 
up the directory chain not only uses much memory but also much CPU time.

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http://savannah.gnu.org/patch/?func=detailpatch&patch_id=1798&group_id=30

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