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NFS: Use an atomic_long_t to count the number of requests

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Rather than forcing us to take the inode->i_lock just in order to bump
the number.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
This commit is contained in:
Trond Myklebust
2017-08-01 15:39:46 -04:00
parent e824f99ada
commit a6b6d5b85a
6 changed files with 13 additions and 24 deletions
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18
fs/nfs/write.c
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@@ -434,9 +434,7 @@ nfs_destroy_unlinked_subrequests(struct nfs_page *destroy_list,
if (test_and_clear_bit(PG_INODE_REF, &subreq->wb_flags)) {
nfs_release_request(subreq);
spin_lock(&inode->i_lock);
NFS_I(inode)->nrequests--;
spin_unlock(&inode->i_lock);
atomic_long_dec(&NFS_I(inode)->nrequests);
}
/* subreq is now totally disconnected from page group or any
@@ -567,9 +565,7 @@ try_again:
if (test_and_clear_bit(PG_REMOVE, &head->wb_flags)) {
set_bit(PG_INODE_REF, &head->wb_flags);
kref_get(&head->wb_kref);
spin_lock(&inode->i_lock);
NFS_I(inode)->nrequests++;
spin_unlock(&inode->i_lock);
atomic_long_inc(&NFS_I(inode)->nrequests);
}
nfs_page_group_unlock(head);
@@ -755,7 +751,7 @@ static void nfs_inode_add_request(struct inode *inode, struct nfs_page *req)
nfs_lock_request(req);
spin_lock(&inode->i_lock);
if (!nfsi->nrequests &&
if (!nfs_have_writebacks(inode) &&
NFS_PROTO(inode)->have_delegation(inode, FMODE_WRITE))
inode->i_version++;
/*
@@ -767,7 +763,7 @@ static void nfs_inode_add_request(struct inode *inode, struct nfs_page *req)
SetPagePrivate(req->wb_page);
set_page_private(req->wb_page, (unsigned long)req);
}
nfsi->nrequests++;
atomic_long_inc(&nfsi->nrequests);
/* this a head request for a page group - mark it as having an
* extra reference so sub groups can follow suit.
* This flag also informs pgio layer when to bump nrequests when
@@ -786,6 +782,7 @@ static void nfs_inode_remove_request(struct nfs_page *req)
struct nfs_inode *nfsi = NFS_I(inode);
struct nfs_page *head;
atomic_long_dec(&nfsi->nrequests);
if (nfs_page_group_sync_on_bit(req, PG_REMOVE)) {
head = req->wb_head;
@@ -795,11 +792,6 @@ static void nfs_inode_remove_request(struct nfs_page *req)
ClearPagePrivate(head->wb_page);
clear_bit(PG_MAPPED, &head->wb_flags);
}
nfsi->nrequests--;
spin_unlock(&inode->i_lock);
} else {
spin_lock(&inode->i_lock);
nfsi->nrequests--;
spin_unlock(&inode->i_lock);
}