nothing much

Straight replacement of B_BUSY with a sleeping lock.

Remove trailing white space with:
for f in *.{h,c}; do sed -i .sed 's/[[:blank:]]*$//' $f; done
(Thanks to Nicolás Wolovick)

Pick up where i left off in april:
- move log into metadata part of disk, so that marking
that the log's blocks are in use falls out for free
- superblock describes the whole disk (sizes and offets)

Pick up where i left off in april:
- move log into metadata part of disk, so that marking
that the log's blocks are in use falls out for free
- superblock describes the whole disk (sizes and offets)
- sizes and offsets are computed in one place (mkfs) and
the rest of the code refers to the superblock for these values,
instead of recomputing them.

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Disentangle block size from the disk's sector size. Set block size to 1024 to show
that they can be different. Clean up mkfs, simplifying specifying fs parameters,
remove some redundancy between fs

Disentangle block size from the disk's sector size. Set block size to 1024 to show
that they can be different. Clean up mkfs, simplifying specifying fs parameters,
remove some redundancy between fs and mkfs, and fix disk layout bugs. Call blocks
in the file system blocks instead of sectors. Passes usertests for different
block sizes.

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fix buf where concurrent fs syscalls race on log entries

Nice layout for a printout of the code

write log blocks from cache only at end of transaction

nits

i think this is a working concurrent logging scheme

a start at concurrent FS system calls

every iput() and namei() must be inside a transaction

don't let dirty blocks be evicted from cache!

clarify some FS comments

Add blank page to get our super FS spreads back

Remove comment debug prints from log.c; now fits nicely in a spread

Define struct log separately from log to avoid confusing column breaker

Comment balance

Remove unused headers from log.c

Fix layout issues for printed version

Revert "Introduce and use sleeplocks instead of BUSY flags"
My changes have a race with re-used bufs and the code doesn't seem to get shorter
Keep the changes that fixed ip->off race

This reverts co

Revert "Introduce and use sleeplocks instead of BUSY flags"
My changes have a race with re-used bufs and the code doesn't seem to get shorter
Keep the changes that fixed ip->off race

This reverts commit 3a5fa7ed9020eaf8ab843a16d26db7393b2ec072.

Conflicts:

defs.h
file.c
file.h

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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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Only commit log to disk if something was written in to it.

Without this, every write to the console results in log writes.

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