Messages in this thread | | | Date | Wed, 8 Feb 2006 19:13:21 -0500 | From | kapil a <> | Subject | Re: file system question |
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---------- Forwarded message ---------- From: kapil a <kapilann@gmail.com> Date: Feb 8, 2006 7:11 PM Subject: Re: file system question To: Avishay Traeger <atraeger@cs.sunysb.edu>
thanks for the reply and sorry for the unclear question.
What i meant was when i do an "ls" in a directory that is part of the ext2 filesystem, i can see a "write" call in the strace output at the end and it writes the directory contents to stdout. However when i issue "ls" in the mount point of my file system, i dont have the "write" call. The strace ends with the getdents64 call.
When i did some debugging i found that filldir which is suppose to fill the dirent with the directory entries does its job. My filesystem currently has only one inode with one block of data where i have a ".", ".." and "test" written into it.
The problem is it does not go further to do some of the other calls as in a mountpoint in ext2 file system.
Hope i am clear now.
kaps
On 2/8/06, Avishay Traeger <atraeger@cs.sunysb.edu> wrote: > On Wed, 2006-02-08 at 18:39 -0500, kapil a wrote: > > I am trying to write a file system for 2.6. I have written the > > required things to mount my file system and now i am trying to get > > some f_op's and d_op's. I was trying to make the 'ls' command work. So > > i wrote a myfs_readdir() and linked it to the f_op field. My routine > > gets called and also filldir gets called and stores the data in the > > dirent but i dont get the output in stdout. > > > > On using strace i find that "ls" does not perform all the calls that > > a "ls" in a directory mountedf in ext2 performs. To be specific, the > > strace ouput ends after the getdents64 system call. In the normal "ls" > > strace, i find there are a couple of more system calls namely a fstat > > followed by a write to stdout and some more mmap calls. > > Correct. The getdents system call will call your readdir function. > > > I dont understand the reason behind why the write is not called. My > > guess is i have not over-ridden some function that i have to write as > > part of my file system instead of using the default method. > > Why would your write function get called when 'ls' writes to stdout? > Please explain your question more clearly. > > > Avishay Traeger > http://www.fsl.cs.sunysb.edu/~avishay/ > > - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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