Mohit, >From your mails it looks to me you are coming very early to post questions on this list. I would suggest to be little patient and go through some text books (preferably Understanding Linux Kernel 3rd Ed.) and try to cover all I/O subsystem related chapters. I am sure most of your answers you will find reading text only. > well by something i mean , that some process needs to access the offset of > file for next read or dup that file discriptor so why each time to go for > inode . (check me if i am wrong) are you saying that process refers to inode for getting next read location? If this is the case, then you are wrong. next read/write location is kept in file object not in inode. file object is like a session between process opening the file and inode of the file. A process (or multiple process) can open a file multiple times creating multiple file objects against a single inode, with each file object reading/writing different portions of same file. Rajat On Wed, Jan 12, 2011 at 5:38 PM, mohit verma <mohit89mlnc@xxxxxxxxx> wrote: > > > On Wed, Jan 12, 2011 at 5:08 PM, prabhu <prabhum@xxxxxxxxxxxxx> wrote: >> >> mohit verma wrote: >> >> hi folks, >> >> i am confused with the functions starting from vfs_ . i think they show >> the significance of VFS model i mean if something could be done without >> touching the disk stuff then why not to do that >> but i am not quite sure. so please help me understand what does these >> actually mean?? >> >> thanks in advance guysss > > well by something i mean , that some process needs to access the offset of > file for next read or dup that file discriptor so why each time to go for > inode . (check me if i am wrong) > > m sorry for not being clear in textual work. > >> but i got it now . thank u for noticing this query. >> >> I am not sure that I understand the above question correctly, you mean >> "what is the use of VFS file system if doing operation without touching >> the disk . >> That means doing operation on cd rom, keyboard,mouse ?" >> >> VFS is a upper layer of all the filesystem and all the module register its >> file operation into this layer. >> So Whenever you doing operation on any file, VFS layer receive the request >> and redirect into corresponding >> registered module operation. >> >> I don't think we can do the operation without vfs. >> >> Please correct me if i am wrong. >> >> Thanks , >> Skm prabhu >> >> ________________________________ >> _______________________________________________ >> Kernelnewbies mailing list >> Kernelnewbies@xxxxxxxxxxxxxxxxx >> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies >> > > > > -- > ........................ > MOHIT VERMA > > _______________________________________________ > Kernelnewbies mailing list > Kernelnewbies@xxxxxxxxxxxxxxxxx > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies > > _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
