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NFS: Ensure PG_writeback is cleared when writeback fails

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If the writebacks are cancelled via nfs_cancel_dirty_list, or due to the
memory allocation failing in nfs_flush_one/nfs_flush_multi, then we must
ensure that the PG_writeback flag is cleared.

Also ensure that we actually own the PG_writeback flag whenever we
schedule a new writeback by making nfs_set_page_writeback() return the
value of test_set_page_writeback().
The PG_writeback page flag ends up replacing the functionality of the
PG_FLUSHING nfs_page flag, so we rip that out too.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Trond Myklebust 2007-04-14 19:10:12 -04:00 • committed by Linus Torvalds
commit 5a6d41b32a
2 changed files with 15 additions and 8 deletions
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include/linux/nfs_page.h
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@ -31,7 +31,6 @@
#define PG_NEED_COMMIT 1
#define PG_NEED_RESCHED 2
#define PG_NEED_FLUSH 3
#define PG_FLUSHING 4
struct nfs_inode;
struct nfs_page {