Hi, I am trying to understand the code flow for how 'ls' works. What I have understood till now is that inorder to display files in a directory filesystems must implement readdir vfs ops, which internally calls filldir to fill the entries. So if vfs readdir maps to myfs_readdir say, then myfs_readdir will be called multiple times with incremented offsets in the directory entry. So myfs_readdir can either fill the new entries with filldir and return 1 , or return 0 if no more entries are there and it will not be called further. What i couldn't get was which is the code which is calling vfs_readdir in the loop and checks for the return value of 0 or 1. Below is the stack trace when vfs_readdir is called. In the function sys_getdents it is called only once. (gdb) bt #0 vfs_readdir (file=0x27201260, filler=0x80aff69 <filldir>, buf=0x26bfbf04) at fs/readdir.c:23 #1 0x080b0106 in sys_getdents (fd=5, dirent=0x2a88d6ac, count=4096) at fs/readdir.c:204 #2 0x0805939a in handle_syscall (r=0x9191494) at arch/um/kernel/skas/syscall.c:38 #3 0x0806584a in handle_trap (pid=24694, regs=0x9191494, local_using_sysemu=2) at arch/um/os-Linux/skas/process.c:173 #4 0x08065c41 in userspace (regs=0x9191494) at arch/um/os-Linux/skas/process.c:330 #5 0x08059145 in fork_handler () at arch/um/kernel/skas/process.c:96 #6 0x085d8b3b in ?? () Any pointers/suggestions appreciated. Thanks in advance. -- Thanks & Regards, ******************************************** Manish Katiyar ( http://mkatiyar.googlepages.com ) 3rd Floor, Fair Winds Block EGL Software Park Off Intermediate Ring Road Bangalore 560071, India *********************************************** -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ
