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NFS: Replace NFS_I(inode)->req_lock with inode->i_lock

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There is no justification for keeping a special spinlock for the exclusive
use of the NFS writeback code.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2007-07-02 09:57:54 -04:00
parent 4e56e082dd
commit 587142f85f
4 changed files with 46 additions and 51 deletions
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1
fs/nfs/inode.c
View file

@ -1154,7 +1154,6 @@ static void init_once(void * foo, struct kmem_cache * cachep, unsigned long flag
struct nfs_inode *nfsi = (struct nfs_inode *) foo;
inode_init_once(&nfsi->vfs_inode);
spin_lock_init(&nfsi->req_lock);
INIT_LIST_HEAD(&nfsi->open_files);
INIT_LIST_HEAD(&nfsi->access_cache_entry_lru);
INIT_LIST_HEAD(&nfsi->access_cache_inode_lru);

11
fs/nfs/pagelist.c
View file

@ -126,12 +126,13 @@ static int nfs_set_page_tag_locked(struct nfs_page *req)
*/
void nfs_clear_page_tag_locked(struct nfs_page *req)
{
struct nfs_inode *nfsi = NFS_I(req->wb_context->path.dentry->d_inode);
struct inode *inode = req->wb_context->path.dentry->d_inode;
struct nfs_inode *nfsi = NFS_I(inode);
if (req->wb_page != NULL) {
spin_lock(&nfsi->req_lock);
spin_lock(&inode->i_lock);
radix_tree_tag_clear(&nfsi->nfs_page_tree, req->wb_index, NFS_PAGE_TAG_LOCKED);
spin_unlock(&nfsi->req_lock);
spin_unlock(&inode->i_lock);
}
nfs_unlock_request(req);
}
@ -390,7 +391,7 @@ void nfs_pageio_cond_complete(struct nfs_pageio_descriptor *desc, pgoff_t index)
* If the number of requests is set to 0, the entire address_space
* starting at index idx_start, is scanned.
* The requests are *not* checked to ensure that they form a contiguous set.
* You must be holding the inode's req_lock when calling this function
* You must be holding the inode's i_lock when calling this function
*/
int nfs_scan_list(struct nfs_inode *nfsi,
struct list_head *dst, pgoff_t idx_start,
@ -430,7 +431,7 @@ int nfs_scan_list(struct nfs_inode *nfsi,
}
}
/* for latency reduction */
cond_resched_lock(&nfsi->req_lock);
cond_resched_lock(&nfsi->vfs_inode.i_lock);
}
out:
return res;

84
fs/nfs/write.c
View file

@ -124,12 +124,12 @@ static struct nfs_page *nfs_page_find_request_locked(struct page *page)
static struct nfs_page *nfs_page_find_request(struct page *page)
{
struct inode *inode = page->mapping->host;
struct nfs_page *req = NULL;
spinlock_t *req_lock = &NFS_I(page->mapping->host)->req_lock;
spin_lock(req_lock);
spin_lock(&inode->i_lock);
req = nfs_page_find_request_locked(page);
spin_unlock(req_lock);
spin_unlock(&inode->i_lock);
return req;
}
@ -251,16 +251,16 @@ static void nfs_end_page_writeback(struct page *page)
static int nfs_page_async_flush(struct nfs_pageio_descriptor *pgio,
struct page *page)
{
struct inode *inode = page->mapping->host;
struct nfs_inode *nfsi = NFS_I(inode);
struct nfs_page *req;
struct nfs_inode *nfsi = NFS_I(page->mapping->host);
spinlock_t *req_lock = &nfsi->req_lock;
int ret;
spin_lock(req_lock);
spin_lock(&inode->i_lock);
for(;;) {
req = nfs_page_find_request_locked(page);
if (req == NULL) {
spin_unlock(req_lock);
spin_unlock(&inode->i_lock);
return 1;
}
if (nfs_lock_request_dontget(req))
@ -270,28 +270,28 @@ static int nfs_page_async_flush(struct nfs_pageio_descriptor *pgio,
* succeed provided that someone hasn't already marked the
* request as dirty (in which case we don't care).
*/
spin_unlock(req_lock);
spin_unlock(&inode->i_lock);
ret = nfs_wait_on_request(req);
nfs_release_request(req);
if (ret != 0)
return ret;
spin_lock(req_lock);
spin_lock(&inode->i_lock);
}
if (test_bit(PG_NEED_COMMIT, &req->wb_flags)) {
/* This request is marked for commit */
spin_unlock(req_lock);
spin_unlock(&inode->i_lock);
nfs_unlock_request(req);
nfs_pageio_complete(pgio);
return 1;
}
if (nfs_set_page_writeback(page) != 0) {
spin_unlock(req_lock);
spin_unlock(&inode->i_lock);
BUG();
}
radix_tree_tag_set(&nfsi->nfs_page_tree, req->wb_index,
NFS_PAGE_TAG_LOCKED);
ret = test_bit(PG_NEED_FLUSH, &req->wb_flags);
spin_unlock(req_lock);
spin_unlock(&inode->i_lock);
nfs_pageio_add_request(pgio, req);
return ret;
}
@ -412,7 +412,7 @@ static void nfs_inode_remove_request(struct nfs_page *req)
BUG_ON (!NFS_WBACK_BUSY(req));
spin_lock(&nfsi->req_lock);
spin_lock(&inode->i_lock);
set_page_private(req->wb_page, 0);
ClearPagePrivate(req->wb_page);
radix_tree_delete(&nfsi->nfs_page_tree, req->wb_index);
@ -420,11 +420,11 @@ static void nfs_inode_remove_request(struct nfs_page *req)
__set_page_dirty_nobuffers(req->wb_page);
nfsi->npages--;
if (!nfsi->npages) {
spin_unlock(&nfsi->req_lock);
spin_unlock(&inode->i_lock);
nfs_end_data_update(inode);
iput(inode);
} else
spin_unlock(&nfsi->req_lock);
spin_unlock(&inode->i_lock);
nfs_clear_request(req);
nfs_release_request(req);
}
@ -458,13 +458,13 @@ nfs_mark_request_commit(struct nfs_page *req)
struct inode *inode = req->wb_context->path.dentry->d_inode;
struct nfs_inode *nfsi = NFS_I(inode);
spin_lock(&nfsi->req_lock);
spin_lock(&inode->i_lock);
nfsi->ncommit++;
set_bit(PG_NEED_COMMIT, &(req)->wb_flags);
radix_tree_tag_set(&nfsi->nfs_page_tree,
req->wb_index,
NFS_PAGE_TAG_COMMIT);
spin_unlock(&nfsi->req_lock);
spin_unlock(&inode->i_lock);
inc_zone_page_state(req->wb_page, NR_UNSTABLE_NFS);
__mark_inode_dirty(inode, I_DIRTY_DATASYNC);
}
@ -534,10 +534,10 @@ static int nfs_wait_on_requests_locked(struct inode *inode, pgoff_t idx_start, u
BUG_ON(!NFS_WBACK_BUSY(req));
kref_get(&req->wb_kref);
spin_unlock(&nfsi->req_lock);
spin_unlock(&inode->i_lock);
error = nfs_wait_on_request(req);
nfs_release_request(req);
spin_lock(&nfsi->req_lock);
spin_lock(&inode->i_lock);
if (error < 0)
return error;
res++;
@ -602,7 +602,6 @@ static struct nfs_page * nfs_update_request(struct nfs_open_context* ctx,
{
struct address_space *mapping = page->mapping;
struct inode *inode = mapping->host;
struct nfs_inode *nfsi = NFS_I(inode);
struct nfs_page *req, *new = NULL;
pgoff_t rqend, end;
@ -612,13 +611,13 @@ static struct nfs_page * nfs_update_request(struct nfs_open_context* ctx,
/* Loop over all inode entries and see if we find
* A request for the page we wish to update
*/
spin_lock(&nfsi->req_lock);
spin_lock(&inode->i_lock);
req = nfs_page_find_request_locked(page);
if (req) {
if (!nfs_lock_request_dontget(req)) {
int error;
spin_unlock(&nfsi->req_lock);
spin_unlock(&inode->i_lock);
error = nfs_wait_on_request(req);
nfs_release_request(req);
if (error < 0) {
@ -628,7 +627,7 @@ static struct nfs_page * nfs_update_request(struct nfs_open_context* ctx,
}
continue;
}
spin_unlock(&nfsi->req_lock);
spin_unlock(&inode->i_lock);
if (new)
nfs_release_request(new);
break;
@ -639,14 +638,14 @@ static struct nfs_page * nfs_update_request(struct nfs_open_context* ctx,
nfs_lock_request_dontget(new);
error = nfs_inode_add_request(inode, new);
if (error) {
spin_unlock(&nfsi->req_lock);
spin_unlock(&inode->i_lock);
nfs_unlock_request(new);
return ERR_PTR(error);
}
spin_unlock(&nfsi->req_lock);
spin_unlock(&inode->i_lock);
return new;
}
spin_unlock(&nfsi->req_lock);
spin_unlock(&inode->i_lock);
new = nfs_create_request(ctx, inode, page, offset, bytes);
if (IS_ERR(new))
@ -974,9 +973,9 @@ static void nfs_writeback_done_partial(struct rpc_task *task, void *calldata)
}
if (nfs_write_need_commit(data)) {
spinlock_t *req_lock = &NFS_I(page->mapping->host)->req_lock;
struct inode *inode = page->mapping->host;
spin_lock(req_lock);
spin_lock(&inode->i_lock);
if (test_bit(PG_NEED_RESCHED, &req->wb_flags)) {
/* Do nothing we need to resend the writes */
} else if (!test_and_set_bit(PG_NEED_COMMIT, &req->wb_flags)) {
@ -987,7 +986,7 @@ static void nfs_writeback_done_partial(struct rpc_task *task, void *calldata)
clear_bit(PG_NEED_COMMIT, &req->wb_flags);
dprintk(" server reboot detected\n");
}
spin_unlock(req_lock);
spin_unlock(&inode->i_lock);
} else
dprintk(" OK\n");
@ -1277,13 +1276,12 @@ static const struct rpc_call_ops nfs_commit_ops = {
int nfs_commit_inode(struct inode *inode, int how)
{
struct nfs_inode *nfsi = NFS_I(inode);
LIST_HEAD(head);
int res;
spin_lock(&nfsi->req_lock);
spin_lock(&inode->i_lock);
res = nfs_scan_commit(inode, &head, 0, 0);
spin_unlock(&nfsi->req_lock);
spin_unlock(&inode->i_lock);
if (res) {
int error = nfs_commit_list(inode, &head, how);
if (error < 0)
@ -1301,7 +1299,6 @@ static inline int nfs_commit_list(struct inode *inode, struct list_head *head, i
long nfs_sync_mapping_wait(struct address_space *mapping, struct writeback_control *wbc, int how)
{
struct inode *inode = mapping->host;
struct nfs_inode *nfsi = NFS_I(inode);
pgoff_t idx_start, idx_end;
unsigned int npages = 0;
LIST_HEAD(head);
@ -1323,7 +1320,7 @@ long nfs_sync_mapping_wait(struct address_space *mapping, struct writeback_contr
}
}
how &= ~FLUSH_NOCOMMIT;
spin_lock(&nfsi->req_lock);
spin_lock(&inode->i_lock);
do {
ret = nfs_wait_on_requests_locked(inode, idx_start, npages);
if (ret != 0)
@ -1334,18 +1331,19 @@ long nfs_sync_mapping_wait(struct address_space *mapping, struct writeback_contr
if (pages == 0)
break;
if (how & FLUSH_INVALIDATE) {
spin_unlock(&nfsi->req_lock);
spin_unlock(&inode->i_lock);
nfs_cancel_commit_list(&head);
ret = pages;
spin_lock(&nfsi->req_lock);
spin_lock(&inode->i_lock);
continue;
}
pages += nfs_scan_commit(inode, &head, 0, 0);
spin_unlock(&nfsi->req_lock);
spin_unlock(&inode->i_lock);
ret = nfs_commit_list(inode, &head, how);
spin_lock(&nfsi->req_lock);
spin_lock(&inode->i_lock);
} while (ret >= 0);
spin_unlock(&nfsi->req_lock);
spin_unlock(&inode->i_lock);
return ret;
}
@ -1439,7 +1437,6 @@ int nfs_set_page_dirty(struct page *page)
{
struct address_space *mapping = page->mapping;
struct inode *inode;
spinlock_t *req_lock;
struct nfs_page *req;
int ret;
@ -1448,18 +1445,17 @@ int nfs_set_page_dirty(struct page *page)
inode = mapping->host;
if (!inode)
goto out_raced;
req_lock = &NFS_I(inode)->req_lock;
spin_lock(req_lock);
spin_lock(&inode->i_lock);
req = nfs_page_find_request_locked(page);
if (req != NULL) {
/* Mark any existing write requests for flushing */
ret = !test_and_set_bit(PG_NEED_FLUSH, &req->wb_flags);
spin_unlock(req_lock);
spin_unlock(&inode->i_lock);
nfs_release_request(req);
return ret;
}
ret = __set_page_dirty_nobuffers(page);
spin_unlock(req_lock);
spin_unlock(&inode->i_lock);
return ret;
out_raced:
return !TestSetPageDirty(page);

1
include/linux/nfs_fs.h
View file

@ -156,7 +156,6 @@ struct nfs_inode {
/*
* This is the list of dirty unwritten pages.
*/
spinlock_t req_lock;
struct radix_tree_root nfs_page_tree;
unsigned long ncommit,