Konstantin Belousov 2cc7d26f7f Cylinder group bitmaps and blocks containing inode for a snapshot ... file are after snaplock, while other ffs device buffers are before snaplock in global lock order. By itself, this could cause deadlock when bdwrite() tries to flush dirty buffers on snapshotted ffs. If, during the flush, COW activity for snapshot needs to allocate block and ffs_alloccg() selects the cylinder group that is being written by bdwrite(), then kernel would panic due to recursive buffer lock acquision. Avoid dealing with buffers in bdwrite() that are from other side of snaplock divisor in the lock order then the buffer being written. Add new BOP, bop_bdwrite(), to do dirty buffer flushing for same vnode in the bdwrite(). Default implementation, bufbdflush(), refactors the code from bdwrite(). For ffs device buffers, specialized implementation is used. Reviewed by: tegge, jeff, Russell Cattelan (cattelan xfs org, xfs changes) Tested by: Peter Holm X-MFC after: 3 weeks (if ever: it changes ABI)		2007-01-23 10:01:19 +00:00
..
bootp_subr.c	consolidate parsing of nfs root mount options in one place	2006-12-06 02:15:25 +00:00
krpc_subr.c
krpc.h
nfs_bio.c	Introduce a field to struct vm_page for storing flags that are	2006-08-09 17:43:27 +00:00
nfs_diskless.c	consolidate parsing of nfs root mount options in one place	2006-12-06 02:15:25 +00:00
nfs_lock.c	Fix typos in comment.	2006-08-16 23:53:05 +00:00
nfs_lock.h
nfs_nfsiod.c	Since NFSv4 is not SMP safe, nfsiod needs to acquire Giant for NFSv4 mounts	2006-05-24 23:06:50 +00:00
nfs_node.c	In nfs_nget(), we must initialize the fh in the nfsnode before inserting the	2006-11-29 02:21:40 +00:00
nfs_socket.c	NetApp filers return corrupt post op attrs in the wcc on NFS error responses.	2006-12-11 19:54:25 +00:00
nfs_subs.c	Fixes up the handling of shared vnode lock lookups in the NFS client,	2006-09-13 18:39:09 +00:00
nfs_vfsops.c	consolidate parsing of nfs root mount options in one place	2006-12-06 02:15:25 +00:00
nfs_vnops.c	Cylinder group bitmaps and blocks containing inode for a snapshot	2007-01-23 10:01:19 +00:00
nfs.h	1) Fix up locking in nfs_up() and nfs_down.	2006-11-20 04:14:23 +00:00
nfsargs.h
nfsdiskless.h	consolidate parsing of nfs root mount options in one place	2006-12-06 02:15:25 +00:00
nfsm_subs.h
nfsmount.h	Refactor the NFS over UDP retransmit timeout estimation logic to allow	2006-05-23 18:33:58 +00:00
nfsnode.h	Fixes up the handling of shared vnode lock lookups in the NFS client,	2006-09-13 18:39:09 +00:00
nfsstats.h
nlminfo.h