On 18/07/12 16:27, S. K. wrote:
> How YAFFS2 manages the Deleted file until GC deletes them physically?
> How Does the logically deletion happen ?

There are quite a few edge cases, particularly in the case of hard 
links, so I suggest you read the code for a full picture. It's in 
yaffs_guts.c; look at yaffs_unlink_worker. (It's quite instructive to 
follow through various calls from the high-level filesystem entrypoints 
in yaffsfs.c.)

In short, a file is resized to size zero (so its data chunks will be 
GCed), and it is moved so that it is in the "deleted" directory. This is 
done through the regular filesystem operations so is written into the 
filesystem log in the usual way. After that, the file's header and data 
chunks no refer to a live file, so are free to be reclaimed by the GC at 
some suitable point.

Ross