i broke sbrk, fix it

clean up stale error checks and panics
delete unused functions
a few comments

inode addrs[NDIRECT] -> NADDRS
fix race in mknod / creat
use last component in dirent in mknod, not path

user-level malloc (untested)
nit in sbrk
indirect block
fix dup to share fd struct

i/o redirection in sh
better parsing of sh commands (copied from jos sh)
cat: read from 1 if no args
sbrk system call, but untested
getpid system call
moved locks in keyboard intr, but why do we get

i/o redirection in sh
better parsing of sh commands (copied from jos sh)
cat: read from 1 if no args
sbrk system call, but untested
getpid system call
moved locks in keyboard intr, but why do we get intr w. null characters from keyboard?

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compiling, but untested dup

removed block system call
renumber system calls (run gmake clean!)
skeleton for dup system call

commented out code for cwd

namei returns locked parent dir inode for create / unlink
don't hold fd table lock across idecref() (latter does block i/o)
idecref calls iput() in case last ref -> freeing inode
dir size is 512 * #

namei returns locked parent dir inode for create / unlink
don't hold fd table lock across idecref() (latter does block i/o)
idecref calls iput() in case last ref -> freeing inode
dir size is 512 * # blocks, so readi/writei &c work
unlink deletes dirent even if ip->nlink > 0

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link()

zero out all of dirent.name when creating
don't increase length of directory

fix getblk to actually lock the block
no more cons_put system calls
usertests tests two processes writing files

fstat
primitive ls

unlink,mknod,create with multi-component pathnames should work now
remove console init code from userfs

fix deadlock---iput(dp) asap
working unlink, but doesn't free dir blocks that become empty
remove out-of-date comment in ioapic

init creates console, opens 0/1/2, runs sh
sh accepts 0-argument commands (like userfs)
reads from console

interrupts could be recursive since lapic_eoi() called before rti
so fast interrupts overflow the kernel stack
fix: cli() before lapic_eoi()

low-level keyboard input (not hooked up to /dev yet)
fix acquire() to cli() *before* incrementing nlock
make T_SYSCALL a trap gate, not an interrupt gate
sadly, various crashes if you hold down a key

low-level keyboard input (not hooked up to /dev yet)
fix acquire() to cli() *before* incrementing nlock
make T_SYSCALL a trap gate, not an interrupt gate
sadly, various crashes if you hold down a keyboard key...

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printf
convert userfs to use printf
bfree
ifree
writei
start on unlink

devsw
checkpoint: write(fd,"hello\n",6) where fd is a console dev almost works

mknod,ialloc,iupdate

bwrite

generalize async read to support write too

nit

better interrupt plan---this one appears to work
ioapic