Commit graph

87 commits

Author SHA1 Message Date
Russ Cox f9a06440ab rearrangements and cleanup for text 2009-07-11 19:26:01 -07:00
rsc 34295f461a group locks into structs they protect.
few naming nits.
2009-05-31 05:12:21 +00:00
rsc ce72cadbe0 fix bug fix 2009-05-31 01:53:08 +00:00
rsc 13ae8808c4 tidy fs.c; bmap callers always expected allocation 2009-05-31 01:44:20 +00:00
rsc f12551b599 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.
2009-05-31 01:34:46 +00:00
rsc ba6cd8a685 drop NADDRS and INDIRECT; too many names 2009-05-31 00:59:37 +00:00
rtm 8eb20827c2 Explain why itrunc() is OK w.r.t. crashes. 2008-10-20 18:05:48 +00:00
kolya e1626709d6 free the indirect block 2008-10-16 15:00:23 +00:00
rtm 2ce40d7088 be clear what the root i-number is 2008-10-08 18:57:13 +00:00
rsc bf2932a686 final nits 2007-08-28 19:39:49 +00:00
rsc 5516be1fed spaces around else for rtm 2007-08-28 18:37:41 +00:00
rsc e4d6a21165 more consistent spacing 2007-08-28 18:32:08 +00:00
rsc d844f0f9d9 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.
2007-08-28 17:49:49 +00:00
rsc 3341e30f6e nit 2007-08-28 04:13:24 +00:00
rsc 8970df0c1b No one is going to find this inode.
There is only one ref to it -- the caller --
and no links to it.
2007-08-28 03:31:11 +00:00
rsc 558ab49f13 delete unnecessary #include lines 2007-08-27 23:26:33 +00:00
rsc 7895178df3 nits 2007-08-27 14:31:50 +00:00
rsc 6c34f97cb8 tell what an inode is 2007-08-27 14:23:48 +00:00
rsc a505fd6651 FS cleanup.
Add utility routines bzero, readsb so that balloc, bfree fit on one page.
Make balloc loop clearer.
2007-08-27 14:20:24 +00:00
rsc 8d2e9a4867 shuffle for formatting 2007-08-24 22:17:54 +00:00
rsc 766ba5cc06 first ever correct use of strncpy 2007-08-24 21:00:02 +00:00
rsc 07090dd705 Remove struct uinode.
Remove type arg to mknod (assume T_DEV).
2007-08-24 20:54:23 +00:00
rsc 4d39b63388 nits 2007-08-24 19:46:19 +00:00
rtm 902b13f5d6 simplify ide queuing
nits in comments
2007-08-24 19:32:36 +00:00
rtm 2036534834 add missing iput() at end of _namei() 2007-08-24 14:56:17 +00:00
rsc f0721f1be4 tweaks 2007-08-22 06:20:10 +00:00
rsc eaea18cb9c PDF at http://am.lcs.mit.edu/~rsc/xv6.pdf
Various changes made while offline.

 + bwrite sector argument is redundant; use b->sector.
 + reformatting of files for nicer PDF page breaks
 + distinguish between locked, unlocked inodes in type signatures
 + change FD_FILE to FD_INODE
 + move userinit (nee proc0init) to proc.c
 + move ROOTDEV to param.h
 + always parenthesize sizeof argument
2007-08-22 06:01:32 +00:00
rsc fbf9103952 remove namelen parameter 2007-08-21 19:58:55 +00:00
rsc f32f3638f4 Various cleanup:
- Got rid of dummy proc[0].  Now proc[0] is init.
 - Added initcode.S to exec /init, so that /init is
   just a regular binary.
 - Moved exec out of sysfile to exec.c
 - Moved code dealing with fs guts (like struct inode)
   from sysfile.c to fs.c.  Code dealing with system call
   arguments stays in sysfile.c
 - Refactored directory routines in fs.c; should be simpler.
 - Changed iget to return *unlocked* inode structure.
   This solves the lookup-then-use race in namei
   without introducing deadlocks.
   It also enabled getting rid of the dummy proc[0].
2007-08-21 19:22:08 +00:00
rsc e2a620da49 checkpoint - simpler namei interface 2007-08-20 19:37:15 +00:00
rsc bcca6c6bde shuffle fs.c in bottom-up order 2007-08-20 18:23:52 +00:00
rsc 7d4aef6cfd various cleanups 2007-08-10 16:52:31 +00:00
rsc b6095304b7 Make cp a magic symbol. 2007-08-10 16:37:27 +00:00
rsc bc01170334 The final curproc[cpu()] is now cp 2007-08-09 19:06:37 +00:00
rsc ab5c2dbb59 Clearer namei 2007-08-09 19:05:00 +00:00
rsc 95c07f8267 move ialloc body up, avoiding double check for end of loop 2007-08-08 09:53:46 +00:00
rsc 32eea7665a panic like bget 2007-08-08 09:50:46 +00:00
rsc d80b06a1e0 iincref returns new ref 2007-08-08 09:30:42 +00:00
rsc 5f0c20ec14 fix . .. unlink bug 2007-08-08 09:08:29 +00:00
kaashoek 8e1d1ec934 some comment changes 2006-09-08 14:36:44 +00:00
rsc be29b8e263 ++ 2006-09-08 14:26:16 +00:00
rsc d911d83ca1 fix various comments 2006-09-08 13:55:43 +00:00
rsc 1542186378 allow long names again 2006-09-07 15:34:28 +00:00
rsc 0d6bbd3172 clean namei search loop 2006-09-07 15:15:32 +00:00
rsc bb207a1d42 comments 2006-09-07 14:28:12 +00:00
rsc 1dca3afbbb remove _ prefixes 2006-09-07 13:08:23 +00:00
rsc 0cfc7290e8 wrap long lines 2006-09-06 19:08:14 +00:00
rsc db8fb62e4d for vs while 2006-09-06 18:47:51 +00:00
rsc 48b824703b break single-line if statements 2006-09-06 17:57:47 +00:00
rsc f552738889 no /* */ comments 2006-09-06 17:50:20 +00:00