Introduce and use sleeplocks instead of BUSY flags
Remove I_BUSY, B_BUSY, and intrans defs and usages
One spinlock per buf to avoid ugly loop in bget
fix race in filewrite (don't update f->off after

Introduce and use sleeplocks instead of BUSY flags
Remove I_BUSY, B_BUSY, and intrans defs and usages
One spinlock per buf to avoid ugly loop in bget
fix race in filewrite (don't update f->off after releasing lock)

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make dirlookup and dirlink more similar

avoid deadlock by calling begin_trans() before locking any inodes

log write() data
usertest for big write()s
push begin_trans/commit_trans down into syscalls

Dirt simple logging
Passes usertests and stressfs
Seems to recover correctly in a number of simple cases

do not run past the end of the disk!
[ cherry-picked de6075ff0978108daea1d658425bcb37663a98a0 ]

Conflicts:

fs.c

Comment typo

assorted fixes:
* rename c/cp to cpu/proc
* rename cpu.context to cpu.scheduler
* fix some comments
* formatting for printout

shuffle and tweak for formatting.
pdf has very good page breaks now.
would be a good copy for fall 2009.

rearrangements and cleanup for text

group locks into structs they protect.
few naming nits.

fix bug fix

tidy fs.c; bmap callers always expected allocation

inode reuse bug.

Suppose an inode has been used and freed.
It is left marked I_VALID (the bug).
Now ialloc comes along and reuses the
inode. It writes the new inode type to disk
and returns iget(de

inode reuse bug.

Suppose an inode has been used and freed.
It is left marked I_VALID (the bug).
Now ialloc comes along and reuses the
inode. It writes the new inode type to disk
and returns iget(dev, inum) to get the
cache entry. Iget sees that the inode is valid
and doesn't bother refreshing from disk.
Now when the caller iupdates, it will write
out a zero type and the file or directory has
disappeared.

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drop NADDRS and INDIRECT; too many names

Explain why itrunc() is OK w.r.t. crashes.

free the indirect block

be clear what the root i-number is

final nits

spaces around else for rtm

more consistent spacing

Change dev read/write functions
to take inode* instead of minor number.

Unlock console inode during console_read
and console_write. Otherwise background
processes cannot write to console while the

Change dev read/write functions
to take inode* instead of minor number.

Unlock console inode during console_read
and console_write. Otherwise background
processes cannot write to console while the
shell is reading it waiting for input.

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nit

No one is going to find this inode.
There is only one ref to it -- the caller --
and no links to it.

delete unnecessary #include lines