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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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2
fs/nfs/callback_proc.c
View File

@ -51,7 +51,7 @@ __be32 nfs4_callback_getattr(void *argp, void *resp,
goto out_iput;
res->size = i_size_read(inode);
res->change_attr = delegation->change_attr;
if (nfsi->nrequests != 0)
if (nfs_have_writebacks(inode))
res->change_attr++;
res->ctime = inode->i_ctime;
res->mtime = inode->i_mtime;

2
fs/nfs/delegation.c
View File

@ -1089,7 +1089,7 @@ bool nfs4_delegation_flush_on_close(const struct inode *inode)
delegation = rcu_dereference(nfsi->delegation);
if (delegation == NULL || !(delegation->type & FMODE_WRITE))
goto out;
if (nfsi->nrequests < delegation->pagemod_limit)
if (atomic_long_read(&nfsi->nrequests) < delegation->pagemod_limit)
ret = false;
out:
rcu_read_unlock();

7
fs/nfs/inode.c
View File

@ -1285,7 +1285,6 @@ static bool nfs_file_has_buffered_writers(struct nfs_inode *nfsi)
static unsigned long nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr)
{
struct nfs_inode *nfsi = NFS_I(inode);
unsigned long ret = 0;
if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE)
@ -1315,7 +1314,7 @@ static unsigned long nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr
if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE)
&& (fattr->valid & NFS_ATTR_FATTR_SIZE)
&& i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size)
&& nfsi->nrequests == 0) {
&& !nfs_have_writebacks(inode)) {
i_size_write(inode, nfs_size_to_loff_t(fattr->size));
ret |= NFS_INO_INVALID_ATTR;
}
@ -1823,7 +1822,7 @@ static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
if (new_isize != cur_isize) {
/* Do we perhaps have any outstanding writes, or has
* the file grown beyond our last write? */
if (nfsi->nrequests == 0 || new_isize > cur_isize) {
if (!nfs_have_writebacks(inode) || new_isize > cur_isize) {
i_size_write(inode, new_isize);
if (!have_writers)
invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
@ -2012,7 +2011,7 @@ static void init_once(void *foo)
INIT_LIST_HEAD(&nfsi->access_cache_entry_lru);
INIT_LIST_HEAD(&nfsi->access_cache_inode_lru);
INIT_LIST_HEAD(&nfsi->commit_info.list);
nfsi->nrequests = 0;
atomic_long_set(&nfsi->nrequests, 0);
nfsi->commit_info.ncommit = 0;
atomic_set(&nfsi->commit_info.rpcs_out, 0);
init_rwsem(&nfsi->rmdir_sem);

4
fs/nfs/pagelist.c
View File

@ -258,9 +258,7 @@ nfs_page_group_init(struct nfs_page *req, struct nfs_page *prev)
inode = page_file_mapping(req->wb_page)->host;
set_bit(PG_INODE_REF, &req->wb_flags);
kref_get(&req->wb_kref);
spin_lock(&inode->i_lock);
NFS_I(inode)->nrequests++;
spin_unlock(&inode->i_lock);
atomic_long_inc(&NFS_I(inode)->nrequests);
}
}
}

18
fs/nfs/write.c
View File

@ -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 @@ nfs_lock_and_join_requests(struct page *page)
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);
}

4
include/linux/nfs_fs.h
View File

@ -154,7 +154,7 @@ struct nfs_inode {
*/
__be32 cookieverf[2];
unsigned long nrequests;
atomic_long_t nrequests;
struct nfs_mds_commit_info commit_info;
/* Open contexts for shared mmap writes */
@ -511,7 +511,7 @@ extern void nfs_commit_free(struct nfs_commit_data *data);
static inline int
nfs_have_writebacks(struct inode *inode)
{
return NFS_I(inode)->nrequests != 0;
return atomic_long_read(&NFS_I(inode)->nrequests) != 0;
}
/*