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author | alfred <alfred@FreeBSD.org> | 2002-01-13 11:58:06 +0000 |
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committer | alfred <alfred@FreeBSD.org> | 2002-01-13 11:58:06 +0000 |
commit | 844237b3960bfbf49070d6371a84f67f9e3366f6 (patch) | |
tree | 598e20df363e602313c7ad93de8f8c4b4240d61d /sys/ufs | |
parent | 8cd61193307ff459ae72eb7aa6a734eb5e3b427e (diff) | |
download | FreeBSD-src-844237b3960bfbf49070d6371a84f67f9e3366f6.zip FreeBSD-src-844237b3960bfbf49070d6371a84f67f9e3366f6.tar.gz |
SMP Lock struct file, filedesc and the global file list.
Seigo Tanimura (tanimura) posted the initial delta.
I've polished it quite a bit reducing the need for locking and
adapting it for KSE.
Locks:
1 mutex in each filedesc
protects all the fields.
protects "struct file" initialization, while a struct file
is being changed from &badfileops -> &pipeops or something
the filedesc should be locked.
1 mutex in each struct file
protects the refcount fields.
doesn't protect anything else.
the flags used for garbage collection have been moved to
f_gcflag which was the FILLER short, this doesn't need
locking because the garbage collection is a single threaded
container.
could likely be made to use a pool mutex.
1 sx lock for the global filelist.
struct file * fhold(struct file *fp);
/* increments reference count on a file */
struct file * fhold_locked(struct file *fp);
/* like fhold but expects file to locked */
struct file * ffind_hold(struct thread *, int fd);
/* finds the struct file in thread, adds one reference and
returns it unlocked */
struct file * ffind_lock(struct thread *, int fd);
/* ffind_hold, but returns file locked */
I still have to smp-safe the fget cruft, I'll get to that asap.
Diffstat (limited to 'sys/ufs')
-rw-r--r-- | sys/ufs/ffs/ffs_alloc.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/sys/ufs/ffs/ffs_alloc.c b/sys/ufs/ffs/ffs_alloc.c index e2fb3ab..321bf5a 100644 --- a/sys/ufs/ffs/ffs_alloc.c +++ b/sys/ufs/ffs/ffs_alloc.c @@ -1906,10 +1906,12 @@ sysctl_ffs_fsck(SYSCTL_HANDLER_ARGS) vn_start_write((struct vnode *)fp->f_data, &mp, V_WAIT); if (mp == 0 || strncmp(mp->mnt_stat.f_fstypename, "ufs", MFSNAMELEN)) { vn_finished_write(mp); + fdrop(fp, curthread); return (EINVAL); } if (mp->mnt_flag & MNT_RDONLY) { vn_finished_write(mp); + fdrop(fp, curthread); return (EROFS); } ump = VFSTOUFS(mp); @@ -2041,6 +2043,7 @@ sysctl_ffs_fsck(SYSCTL_HANDLER_ARGS) break; } + fdrop(fp, curthread); vn_finished_write(mp); return (error); } |