NFS: Fix another nfs_wb_page() deadlock

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commit 0522f6aded upstream.

J.R. Okajima reports that the call to sync_inode() in nfs_wb_page() can
deadlock with other writeback flush calls. It boils down to the fact
that we cannot ever call writeback_single_inode() while holding a page
lock (even if we do set nr_to_write to zero) since another process may
already be waiting in the call to do_writepages(), and so will deny us
the I_SYNC lock.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

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Trond Myklebust 2010-05-26 08:42:24 -04:00 • committed by Greg Kroah-Hartman

parent 53dc58fdce

commit 135b48da0c

1 changed files with 5 additions and 2 deletions

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fs/nfs/write.c

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