On Sat, 2006-01-07 at 11:22 +0530, prasad Musale wrote: > Hello Friends, > I am doing work on stackable file system RAIF, which implements the > RAID functionality at file system level. I got confused about where to > put my stackable functions. E.g. for reading a file sys_read calls the > vfs_read(), which in turn calls the lower level fs read() function(In > most of the fs it's generic_file_read()). Generic_file_read() uses > page cache & get page from disk .Now if I want to add my > functionality(Stripping or mirroring), where should I add it? > In generic_file_read() or before generic_file_read(that means > capturing the pointer from vfs, adding our function & then calling > generic_file_read.)? > Does anyone knows more about stackable fs. I know the basic design but > do not know it at coding level. > Thanks. Hello, May I ask what this project is for? I hope you realize that it has already been done: http://www.fsl.cs.sunysb.edu/project-raif.html If you want to make a stackable file system, try using FiST: http://www.fsl.cs.sunysb.edu/project-fist.html You can also use the unionfs source code to help you, since it is also a stackable fan-out file system: http://www.fsl.cs.sunysb.edu/project-unionfs.html Good luck. Avishay Traeger http://www.fsl.cs.sunysb.edu/~avishay/ -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
