mirror of
https://github.com/freebsd/freebsd-src
synced 2024-10-20 07:14:06 +00:00
426da3bcfb
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.
|
||
|---|---|---|
| .. | ||
| cd9660 | ||
| coda | ||
| deadfs | ||
| devfs | ||
| fdescfs | ||
| fifofs | ||
| hpfs | ||
| msdosfs | ||
| ntfs | ||
| nullfs | ||
| nwfs | ||
| portalfs | ||
| procfs | ||
| pseudofs | ||
| smbfs | ||
| specfs | ||
| umapfs | ||
| unionfs | ||