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NFS: Don't check lock owner compatability unless file is locked (part 2)

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When coalescing requests into a single READ or WRITE RPC call, and there
is no file locking involved, we don't have to refuse coalescing for
requests where the lock owner information doesn't match.

Reported-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2013-09-06 11:09:38 -04:00
parent 0f1d260550
commit 4109bb7496
1 changed files with 16 additions and 6 deletions
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22
fs/nfs/pagelist.c
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@ -328,6 +328,19 @@ void nfs_pageio_init(struct nfs_pageio_descriptor *desc,
}
EXPORT_SYMBOL_GPL(nfs_pageio_init);
static bool nfs_match_open_context(const struct nfs_open_context *ctx1,
const struct nfs_open_context *ctx2)
{
return ctx1->cred == ctx2->cred && ctx1->state == ctx2->state;
}
static bool nfs_match_lock_context(const struct nfs_lock_context *l1,
const struct nfs_lock_context *l2)
{
return l1->lockowner.l_owner == l2->lockowner.l_owner
&& l1->lockowner.l_pid == l2->lockowner.l_pid;
}
/**
* nfs_can_coalesce_requests - test two requests for compatibility
* @prev: pointer to nfs_page
@ -343,13 +356,10 @@ static bool nfs_can_coalesce_requests(struct nfs_page *prev,
struct nfs_page *req,
struct nfs_pageio_descriptor *pgio)
{
if (req->wb_context->cred != prev->wb_context->cred)
if (!nfs_match_open_context(req->wb_context, prev->wb_context))
return false;
if (req->wb_lock_context->lockowner.l_owner != prev->wb_lock_context->lockowner.l_owner)
return false;
if (req->wb_lock_context->lockowner.l_pid != prev->wb_lock_context->lockowner.l_pid)
return false;
if (req->wb_context->state != prev->wb_context->state)
if (req->wb_context->dentry->d_inode->i_flock != NULL &&
!nfs_match_lock_context(req->wb_lock_context, prev->wb_lock_context))
return false;
if (req->wb_pgbase != 0)
return false;