fssvar.h: struct device * -> device_t.
fss.c: establish unmount hook on first attach, remove on last detach.
vfs_syscalls.c: remove the call of fss_umount_hook().
vfs_trans.c: destroy cow handlers on unmount as fstrans_unmount() will be
called before vfs_hooks.
unconfigured device. That removes the compile-time constant number
of useable devices.
While here, add disk_busy()/disk_unbusy() instrumentation.
Reviewed by: Quentin Garnier <cube@netbsd.org>
- Replace malloc/free with kmem_alloc/kmem_free.
- Use bdev_ioctl() instead of bdevsw_lookup()/(*d_ioctl)().
- Be more fair to readers by cleaning the cache one slot at a time.
snapshots. With this policy in place:
- Separate the snapshot vnode lock from the snapshot common lock.
Snapshots no longer need recursive vnode locks.
- Use a mutex (si_snaplock) to serialize creation, deletion, reading and
writing of snapshots.
- Move ffs_read() for snapshots into ffs_snapshot.c.
Reviewed by: Jason Thorpe <thorpej@netbsd.org>
While here change ffs_copyonwrite() to fail requests from pagedaemon that need
to copy-on-write.
its not on a free list.
Also change buf_init() to not automatically mark buffers `busy' since this
only makes sense for bufcache buffers.
Mark all buf_init'd buffers 'busy' on the places where they ought to be
flagged as such to not confuse the buffer cache.
Fixes PR 38923.
Buffers run through copy-on-write are marked B_COWDONE. This condition
is valid until the buffer has run through bwrite() and gets cleared from
biodone().
Welcome to 4.99.39.
Reviewed by: YAMAMOTO Takashi <yamt@netbsd.org>
The general trend is to remove it from all kernel interfaces and
this is a start. In case the calling lwp is desired, curlwp should
be used.
quick consensus on tech-kern
- Instead of hooking the handler on the specdev of a mounted file system
hook directly on the `struct mount'.
- Rename from `vn_cow_*' to `fscow_*' and move to `kern/vfs_trans.c'. Use
`mount_*specific' instead of clobbering `struct mount' or `struct specinfo'.
- Replace the hand-made reader/writer lock with a krwlock.
- Keep `vn_cow_*' functions and mark as obsolete.
- Welcome to NetBSD 4.99.32 - `struct specinfo' changed size.
Reviewed by: Jason Thorpe <thorpej@netbsd.org>
need to understand the locking around that field. Instead of setting
B_ERROR, set b_error instead. b_error is 'owned' by whoever completes
the I/O request.
The suspension helpers are now put into file system specific operations.
This means every file system not supporting these helpers cannot be suspended
and therefore snapshots are no longer possible.
Implemented for file systems of type ffs.
The new API is enabled on a kernel option NEWVNGATE. This option is
not enabled by default in any kernel config.
Presented and discussed on tech-kern with much input from
Bill Studenmund <wrstuden@netbsd.org> and YAMAMOTO Takashi <yamt@netbsd.org>.
Welcome to 4.99.9 (new vfs op vfs_suspendctl).
- rather than embedding bufq_state in driver softc,
have a pointer to the former.
- move bufq related functions from kern/subr_disk.c to kern/subr_bufq.c.
- rename method to strategy for consistency.
- move some definitions which don't need to be exposed to the rest of kernel
from sys/bufq.h to sys/bufq_impl.h.
(is it better to move it to kern/ or somewhere?)
- fix some obvious breakage in dev/qbus/ts.c. (not tested)
- Add FSSIOFSET and FSSIOFGET ioctl() to set/get the flags.
- Add FSS_UNCONFIG_ON_CLOSE flag to unconfigure the snapshot device
on the last close.
Reviewed by: Jason R. Thorpe <thorpej@netbsd.org>
doing copy-on-write.
- Change VFS_SNAPSHOT() to return the snapshot vnode locked.
- Make the IO path for copy-on-write and snapshot-read more lightweight.
Avoids deadlocks where vn_rdwr(...READ...) has a shared lock and needs
to copy-on-write.
Avoids deadlocks/panics where to clean pages the copy-on-write needs
to allocate pages for its VOP_PUTPAGES().
L_COWINPROGRESS part approved by: Jason R. Thorpe <thorpej@netbsd.org>
hannken