have pages busied and are trying to get the genfs node lock.
This causes a lock order reversal described in PR kern/40389.
This is not a proper fix and only a workaround for NetBSD 5.0.
problem first reported by simonb, patch tested by rmind
embedding the address of its xxx_mountroot() in swapnetbsd.c. This
permits booting of kernels with hard-wired filesystem type even if the
filesystem is in a loadable module (ie, not linked into the kernel
image).
Discussed on current-users. Tested on amd64 and i386 with both hard-
wired and '?' filesystem times, and on both modular and monolithic
kernels.
Thanks to pooka@ for code review and suggestions.
Addresses my PR kern/40167
directory. This doesn't affect non-wapbl renames; it affects wapbl because
one of the lock acquisitions was moved up past where this case otherwise
fails.
PR 40163 from Lloyd Parkes.
ffs_snapshot_read(): Use IO_ALTSEMANTICS to allow reading a snapshot vnode
beyond file system size. Needed to read the snapblklist
on mount.
Persistent snapshots work again.
Should fix PR kern/37425: fss_snapshot_mount panic during fsck.
ffs_snapshot_read(): Allow the kernel to read beyond file system size.
Persistent snapshots work again.
Should fix PR kern/37425: fss_snapshot_mount panic during fsck.
snapshot use. Adjust ffs_blkfree_common to get the fs instance passed
in, the original commit didn't account blocks in the snapshots
correctly. Assert that ffs_blkfree is used with the primary fs instance
and that ffs_checkfreefile is only used for snapshots. Move the bdwrite
from ffs_blkfree_common into the caller for symmetry. This creates a
redundant write of unmodified data for ffs_blkfree_snap if a double free
of a block happens.
Reviewed and tested by hannken@.
block in the cylinder groups of the filesystem. The other user is the
snapshot code, which wants to modify the copied cylinder groups. Use
different frontends to distinguish the cases in preparation for fine
grained locking for cylinder groups.
This changes the order of hook processing as the copy-on-write handlers
are called after the journal processing. This makes more sense as the
journal overwrite is logically part of the disk IO.
- Count frags, not blocks to get the file system size.
- Cannot use blksize() here, it depends on vnode size.
- Correctly update xfersize on short reads.
and wants to busy a page while another thread calls VOP_PUTPAGES on the same
vnode, takes pages busy and wants to start a wapbl transaction.
Reviewed by: Jason Thorpe <thorpej@netbsd.org>
pooka