Release 4.11 fs/nfs/write.c

/*
 * linux/fs/nfs/write.c
 *
 * Write file data over NFS.
 *
 * Copyright (C) 1996, 1997, Olaf Kirch <okir@monad.swb.de>
 */

#include <linux/types.h>
#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/pagemap.h>
#include <linux/file.h>
#include <linux/writeback.h>
#include <linux/swap.h>
#include <linux/migrate.h>

#include <linux/sunrpc/clnt.h>
#include <linux/nfs_fs.h>
#include <linux/nfs_mount.h>
#include <linux/nfs_page.h>
#include <linux/backing-dev.h>
#include <linux/export.h>
#include <linux/freezer.h>
#include <linux/wait.h>

#include <linux/uaccess.h>

#include "delegation.h"
#include "internal.h"
#include "iostat.h"
#include "nfs4_fs.h"
#include "fscache.h"
#include "pnfs.h"

#include "nfstrace.h"


#define NFSDBG_FACILITY		NFSDBG_PAGECACHE


#define MIN_POOL_WRITE		(32)

#define MIN_POOL_COMMIT		(4)

/*
 * Local function declarations
 */
static void nfs_redirty_request(struct nfs_page *req);

static const struct rpc_call_ops nfs_commit_ops;

static const struct nfs_pgio_completion_ops nfs_async_write_completion_ops;

static const struct nfs_commit_completion_ops nfs_commit_completion_ops;

static const struct nfs_rw_ops nfs_rw_write_ops;
static void nfs_clear_request_commit(struct nfs_page *req);
static void nfs_init_cinfo_from_inode(struct nfs_commit_info *cinfo,
				      struct inode *inode);
static struct nfs_page *
nfs_page_search_commits_for_head_request_locked(struct nfs_inode *nfsi,
						struct page *page);


static struct kmem_cache *nfs_wdata_cachep;

static mempool_t *nfs_wdata_mempool;

static struct kmem_cache *nfs_cdata_cachep;

static mempool_t *nfs_commit_mempool;



struct nfs_commit_data *nfs_commitdata_alloc(void)
{
	struct nfs_commit_data *p = mempool_alloc(nfs_commit_mempool, GFP_NOIO);

	if (p) {
		memset(p, 0, sizeof(*p));
		INIT_LIST_HEAD(&p->pages);
	}
	return p;
}
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Trond Myklebust
48
94.12%
3
60.00%
Fred Isaman
2
3.92%
1
20.00%
Mel Gorman
1
1.96%
1
20.00%
Total
51
100.00%
5
100.00%


EXPORT_SYMBOL_GPL(nfs_commitdata_alloc);



void nfs_commit_free(struct nfs_commit_data *p)
{
	mempool_free(p, nfs_commit_mempool);
}
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Fred Isaman
1
5.88%
1
25.00%
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17
100.00%
4
100.00%


EXPORT_SYMBOL_GPL(nfs_commit_free);



static struct nfs_pgio_header *nfs_writehdr_alloc(void)
{
	struct nfs_pgio_header *p = mempool_alloc(nfs_wdata_mempool, GFP_NOIO);

	if (p)
		memset(p, 0, sizeof(*p));
	return p;
}

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Trond Myklebust
32
76.19%
2
28.57%
Fred Isaman
6
14.29%
2
28.57%
Weston Andros Adamson
2
4.76%
1
14.29%
Anna Schumaker
1
2.38%
1
14.29%
Mel Gorman
1
2.38%
1
14.29%
Total
42
100.00%
7
100.00%



static void nfs_writehdr_free(struct nfs_pgio_header *hdr)
{
	mempool_free(hdr, nfs_wdata_mempool);
}

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Trond Myklebust
10
55.56%
2
40.00%
Anna Schumaker
3
16.67%
1
20.00%
Weston Andros Adamson
3
16.67%
1
20.00%
Fred Isaman
2
11.11%
1
20.00%
Total
18
100.00%
5
100.00%



static void nfs_context_set_write_error(struct nfs_open_context *ctx, int error)
{
	ctx->error = error;
	smp_wmb();
	set_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags);
}

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Trond Myklebust
27
81.82%
2
50.00%
Fred Isaman
6
18.18%
2
50.00%
Total
33
100.00%
4
100.00%

/*
 * nfs_page_find_head_request_locked - find head request associated with @page
 *
 * must be called while holding the inode lock.
 *
 * returns matching head request with reference held, or NULL if not found.
 */

static struct nfs_page *

nfs_page_find_head_request_locked(struct nfs_inode *nfsi, struct page *page)
{
	struct nfs_page *req = NULL;

	if (PagePrivate(page))
		req = (struct nfs_page *)page_private(page);
	else if (unlikely(PageSwapCache(page)))
		req = nfs_page_search_commits_for_head_request_locked(nfsi,
			page);

	if (req) {
		WARN_ON_ONCE(req->wb_head != req);
		kref_get(&req->wb_kref);
	}

	return req;
}

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Trond Myklebust
34
37.78%
3
33.33%
Fred Isaman
29
32.22%
2
22.22%
Weston Andros Adamson
17
18.89%
2
22.22%
Mel Gorman
9
10.00%
1
11.11%
Chuck Lever
1
1.11%
1
11.11%
Total
90
100.00%
9
100.00%

/*
 * nfs_page_find_head_request - find head request associated with @page
 *
 * returns matching head request with reference held, or NULL if not found.
 */


static struct nfs_page *nfs_page_find_head_request(struct page *page)
{
	struct inode *inode = page_file_mapping(page)->host;
	struct nfs_page *req = NULL;

	spin_lock(&inode->i_lock);
	req = nfs_page_find_head_request_locked(NFS_I(inode), page);
	spin_unlock(&inode->i_lock);
	return req;
}

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Trond Myklebust
49
77.78%
5
50.00%
Mel Gorman
5
7.94%
2
20.00%
Fred Isaman
4
6.35%
1
10.00%
Bryan Schumaker
3
4.76%
1
10.00%
Weston Andros Adamson
2
3.17%
1
10.00%
Total
63
100.00%
10
100.00%

/* Adjust the file length if we're writing beyond the end */


static void nfs_grow_file(struct page *page, unsigned int offset, unsigned int count)
{
	struct inode *inode = page_file_mapping(page)->host;
	loff_t end, i_size;
	pgoff_t end_index;

	spin_lock(&inode->i_lock);
	i_size = i_size_read(inode);
	end_index = (i_size - 1) >> PAGE_SHIFT;
	if (i_size > 0 && page_index(page) < end_index)
		goto out;
	end = page_file_offset(page) + ((loff_t)offset+count);
	if (i_size >= end)
		goto out;
	i_size_write(inode, end);
	nfs_inc_stats(inode, NFSIOS_EXTENDWRITE);
out:
	spin_unlock(&inode->i_lock);
}

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Trond Myklebust
99
76.74%
6
42.86%
Fred Isaman
14
10.85%
2
14.29%
Linus Torvalds (pre-git)
5
3.88%
1
7.14%
Chuck Lever
4
3.10%
1
7.14%
Bryan Schumaker
3
2.33%
1
7.14%
Mel Gorman
2
1.55%
1
7.14%
Huang Ying
1
0.78%
1
7.14%
Kirill A. Shutemov
1
0.78%
1
7.14%
Total
129
100.00%
14
100.00%

/* A writeback failed: mark the page as bad, and invalidate the page cache */


static void nfs_set_pageerror(struct page *page)
{
	nfs_zap_mapping(page_file_mapping(page)->host, page_file_mapping(page));
}

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Trond Myklebust
20
76.92%
2
50.00%
Mel Gorman
6
23.08%
2
50.00%
Total
26
100.00%
4
100.00%

/*
 * nfs_page_group_search_locked
 * @head - head request of page group
 * @page_offset - offset into page
 *
 * Search page group with head @head to find a request that contains the
 * page offset @page_offset.
 *
 * Returns a pointer to the first matching nfs request, or NULL if no
 * match is found.
 *
 * Must be called with the page group lock held
 */

static struct nfs_page *

nfs_page_group_search_locked(struct nfs_page *head, unsigned int page_offset)
{
	struct nfs_page *req;

	WARN_ON_ONCE(head != head->wb_head);
	WARN_ON_ONCE(!test_bit(PG_HEADLOCK, &head->wb_head->wb_flags));

	req = head;
	do {
		if (page_offset >= req->wb_pgbase &&
		    page_offset < (req->wb_pgbase + req->wb_bytes))
			return req;

		req = req->wb_this_page;
	} while (req != head);

	return NULL;
}

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Weston Andros Adamson
64
68.82%
1
25.00%
Mel Gorman
17
18.28%
1
25.00%
Trond Myklebust
12
12.90%
2
50.00%
Total
93
100.00%
4
100.00%

/*
 * nfs_page_group_covers_page
 * @head - head request of page group
 *
 * Return true if the page group with head @head covers the whole page,
 * returns false otherwise
 */


static bool nfs_page_group_covers_page(struct nfs_page *req)
{
	struct nfs_page *tmp;
	unsigned int pos = 0;
	unsigned int len = nfs_page_length(req->wb_page);

	nfs_page_group_lock(req, false);

	do {
		tmp = nfs_page_group_search_locked(req->wb_head, pos);
		if (tmp) {
			/* no way this should happen */
			WARN_ON_ONCE(tmp->wb_pgbase != pos);
			pos += tmp->wb_bytes - (pos - tmp->wb_pgbase);
		}
	} while (tmp && pos < len);

	nfs_page_group_unlock(req);
	WARN_ON_ONCE(pos > len);
	return pos == len;
}

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Weston Andros Adamson
77
70.00%
3
42.86%
Trond Myklebust
31
28.18%
3
42.86%
Mel Gorman
2
1.82%
1
14.29%
Total
110
100.00%
7
100.00%

/* We can set the PG_uptodate flag if we see that a write request
 * covers the full page.
 */


static void nfs_mark_uptodate(struct nfs_page *req)
{
	if (PageUptodate(req->wb_page))
		return;
	if (!nfs_page_group_covers_page(req))
		return;
	SetPageUptodate(req->wb_page);
}

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Trond Myklebust
25
67.57%
1
50.00%
Weston Andros Adamson
12
32.43%
1
50.00%
Total
37
100.00%
2
100.00%



static int wb_priority(struct writeback_control *wbc)
{
	int ret = 0;

	if (wbc->sync_mode == WB_SYNC_ALL)
		ret = FLUSH_COND_STABLE;
	return ret;
}

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Trond Myklebust
17
54.84%
1
50.00%
Neil Brown
14
45.16%
1
50.00%
Total
31
100.00%
2
100.00%

/*
 * NFS congestion control
 */


int nfs_congestion_kb;


#define NFS_CONGESTION_ON_THRESH 	(nfs_congestion_kb >> (PAGE_SHIFT-10))

#define NFS_CONGESTION_OFF_THRESH	\
	(NFS_CONGESTION_ON_THRESH - (NFS_CONGESTION_ON_THRESH >> 2))



static void nfs_set_page_writeback(struct page *page)
{
	struct nfs_server *nfss = NFS_SERVER(page_file_mapping(page)->host);
	int ret = test_set_page_writeback(page);

	WARN_ON_ONCE(ret != 0);

	if (atomic_long_inc_return(&nfss->writeback) >
			NFS_CONGESTION_ON_THRESH) {
		set_bdi_congested(&nfss->backing_dev_info,
					BLK_RW_ASYNC);
	}
}

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Peter Zijlstra
42
64.62%
2
40.00%
Trond Myklebust
17
26.15%
1
20.00%
Mel Gorman
3
4.62%
1
20.00%
Jens Axboe
3
4.62%
1
20.00%
Total
65
100.00%
5
100.00%



static void nfs_end_page_writeback(struct nfs_page *req)
{
	struct inode *inode = page_file_mapping(req->wb_page)->host;
	struct nfs_server *nfss = NFS_SERVER(inode);

	if (!nfs_page_group_sync_on_bit(req, PG_WB_END))
		return;

	end_page_writeback(req->wb_page);
	if (atomic_long_dec_return(&nfss->writeback) < NFS_CONGESTION_OFF_THRESH)
		clear_bdi_congested(&nfss->backing_dev_info, BLK_RW_ASYNC);
}


Contributors
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Peter Zijlstra
52
69.33%
2
40.00%
Weston Andros Adamson
19
25.33%
1
20.00%
Mel Gorman
3
4.00%
1
20.00%
Jens Axboe
1
1.33%
1
20.00%
Total
75
100.00%
5
100.00%

/* nfs_page_group_clear_bits
 *   @req - an nfs request
 * clears all page group related bits from @req
 */

static void

nfs_page_group_clear_bits(struct nfs_page *req)
{
	clear_bit(PG_TEARDOWN, &req->wb_flags);
	clear_bit(PG_UNLOCKPAGE, &req->wb_flags);
	clear_bit(PG_UPTODATE, &req->wb_flags);
	clear_bit(PG_WB_END, &req->wb_flags);
	clear_bit(PG_REMOVE, &req->wb_flags);
}


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61
100.00%
1
100.00%

/*
 * nfs_unroll_locks_and_wait -  unlock all newly locked reqs and wait on @req
 *
 * this is a helper function for nfs_lock_and_join_requests
 *
 * @inode - inode associated with request page group, must be holding inode lock
 * @head  - head request of page group, must be holding head lock
 * @req   - request that couldn't lock and needs to wait on the req bit lock
 * @nonblock - if true, don't actually wait
 *
 * NOTE: this must be called holding page_group bit lock and inode spin lock
 *       and BOTH will be released before returning.
 *
 * returns 0 on success, < 0 on error.
 */

static int
nfs_unroll_locks_and_wait(struct inode *inode, struct nfs_page *head,
			  struct nfs_page *req, bool nonblock)
	__releases(&inode->i_lock
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)
{
	struct nfs_page *tmp;
	int ret;

	/* relinquish all the locks successfully grabbed this run */
	for (tmp = head ; tmp != req; tmp = tmp->wb_this_page)
		nfs_unlock_request(tmp);

	WARN_ON_ONCE(test_bit(PG_TEARDOWN, &req->wb_flags));

	/* grab a ref on the request that will be waited on */
	kref_get(&req->wb_kref);

	nfs_page_group_unlock(head);
	spin_unlock(&inode->i_lock);

	/* release ref from nfs_page_find_head_request_locked */
	nfs_release_request(head);

	if (!nonblock)
		ret = nfs_wait_on_request(req);
	else
		ret = -EAGAIN;
	nfs_release_request(req);

	return ret;
}

/*
 * nfs_destroy_unlinked_subrequests - destroy recently unlinked subrequests
 *
 * @destroy_list - request list (using wb_this_page) terminated by @old_head
 * @old_head - the old head of the list
 *
 * All subrequests must be locked and removed from all lists, so at this point
 * they are only "active" in this function, and possibly in nfs_wait_on_request
 * with a reference held by some other context.
 */

static void

nfs_destroy_unlinked_subrequests(struct nfs_page *destroy_list,
				 struct nfs_page *old_head)
{
	while (destroy_list) {
		struct nfs_page *subreq = destroy_list;

		destroy_list = (subreq->wb_this_page == old_head) ?
				   NULL : subreq->wb_this_page;

		WARN_ON_ONCE(old_head != subreq->wb_head);

		/* make sure old group is not used */
		subreq->wb_head = subreq;
		subreq->wb_this_page = subreq;

		/* subreq is now totally disconnected from page group or any
                 * write / commit lists. last chance to wake any waiters */
		nfs_unlock_request(subreq);

		if (!test_bit(PG_TEARDOWN, &subreq->wb_flags)) {
			/* release ref on old head request */
			nfs_release_request(old_head);

			nfs_page_group_clear_bits(subreq);

			/* release the PG_INODE_REF reference */
			if (test_and_clear_bit(PG_INODE_REF, &subreq->wb_flags))
				nfs_release_request(subreq);
			else
				WARN_ON_ONCE(1);
		} else {
			WARN_ON_ONCE(test_bit(PG_CLEAN, &subreq->wb_flags));
			/* zombie requests have already released the last
                         * reference and were waiting on the rest of the
                         * group to complete. Since it's no longer part of a
                         * group, simply free the request */
			nfs_page_group_clear_bits(subreq);
			nfs_free_request(subreq);
		}
	}
}

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Weston Andros Adamson
150
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150
100.00%
1
100.00%

/*
 * nfs_lock_and_join_requests - join all subreqs to the head req and return
 *                              a locked reference, cancelling any pending
 *                              operations for this page.
 *
 * @page - the page used to lookup the "page group" of nfs_page structures
 * @nonblock - if true, don't block waiting for request locks
 *
 * This function joins all sub requests to the head request by first
 * locking all requests in the group, cancelling any pending operations
 * and finally updating the head request to cover the whole range covered by
 * the (former) group.  All subrequests are removed from any write or commit
 * lists, unlinked from the group and destroyed.
 *
 * Returns a locked, referenced pointer to the head request - which after
 * this call is guaranteed to be the only request associated with the page.
 * Returns NULL if no requests are found for @page, or a ERR_PTR if an
 * error was encountered.
 */

static struct nfs_page *

nfs_lock_and_join_requests(struct page *page, bool nonblock)
{
	struct inode *inode = page_file_mapping(page)->host;
	struct nfs_page *head, *subreq;
	struct nfs_page *destroy_list = NULL;
	unsigned int total_bytes;
	int ret;

try_again:
	total_bytes = 0;

	WARN_ON_ONCE(destroy_list);

	spin_lock(&inode->i_lock);

	/*
         * A reference is taken only on the head request which acts as a
         * reference to the whole page group - the group will not be destroyed
         * until the head reference is released.
         */
	head = nfs_page_find_head_request_locked(NFS_I(inode), page);

	if (!head) {
		spin_unlock(&inode->i_lock);
		return NULL;
	}

	/* holding inode lock, so always make a non-blocking call to try the
         * page group lock */
	ret = nfs_page_group_lock(head, true);
	if (ret < 0) {
		spin_unlock(&inode->i_lock);

		if (!nonblock && ret == -EAGAIN) {
			nfs_page_group_lock_wait(head);
			nfs_release_request(head);
			goto try_again;
		}

		nfs_release_request(head);
		return ERR_PTR(ret);
	}

	/* lock each request in the page group */
	subreq = head;
	do {
		/*
                 * Subrequests are always contiguous, non overlapping
                 * and in order - but may be repeated (mirrored writes).
                 */
		if (subreq->wb_offset == (head->wb_offset + total_bytes)) {
			/* keep track of how many bytes this group covers */
			total_bytes += subreq->wb_bytes;
		} else if (WARN_ON_ONCE(subreq->wb_offset < head->wb_offset ||
			    ((subreq->wb_offset + subreq->wb_bytes) >
			     (head->wb_offset + total_bytes)))) {
			nfs_page_group_unlock(head);
			spin_unlock(&inode->i_lock);
			return ERR_PTR(-EIO);
		}

		if (!nfs_lock_request(subreq)) {
			/* releases page group bit lock and
                         * inode spin lock and all references */
			ret = nfs_unroll_locks_and_wait(inode, head,
				subreq, nonblock);

			if (ret == 0)
				goto try_again;

			return ERR_PTR(ret);
		}

		subreq = subreq->wb_this_page;
	} while (subreq != head);

	/* Now that all requests are locked, make sure they aren't on any list.
         * Commit list removal accounting is done after locks are dropped */
	subreq = head;
	do {
		nfs_clear_request_commit(subreq);
		subreq = subreq->wb_this_page;
	} while (subreq != head);

	/* unlink subrequests from head, destroy them later */
	if (head->wb_this_page != head) {
		/* destroy list will be terminated by head */
		destroy_list = head->wb_this_page;
		head->wb_this_page = head;

		/* change head request to cover whole range that
                 * the former page group covered */
		head->wb_bytes = total_bytes;
	}

	/*
         * prepare head request to be added to new pgio descriptor
         */
	nfs_page_group_clear_bits(head);

	/*
         * some part of the group was still on the inode list - otherwise
         * the group wouldn't be involved in async write.
         * grab a reference for the head request, iff it needs one.
         */
	if (!test_and_set_bit(PG_INODE_REF, &head->wb_flags))
		kref_get(&head->wb_kref);

	nfs_page_group_unlock(head);

	/* drop lock to clean uprequests on destroy list */
	spin_unlock(&inode->i_lock);

	nfs_destroy_unlinked_subrequests(destroy_list, head);

	/* still holds ref on head from nfs_page_find_head_request_locked
         * and still has lock on head from lock loop */
	return head;
}

Contributors
Person
Tokens
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Commits
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Weston Andros Adamson
310
75.24%
8
50.00%
Trond Myklebust
94
22.82%
6
37.50%
Mel Gorman
8
1.94%
2
12.50%
Total
412
100.00%
16
100.00%



static void nfs_write_error_remove_page(struct nfs_page *req)
{
	nfs_unlock_request(req);
	nfs_end_page_writeback(req);
	nfs_release_request(req);
	generic_error_remove_page(page_file_mapping(req->wb_page),
				  req->wb_page);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Peng Tao
40
100.00%
1
100.00%
Total
40
100.00%
1
100.00%

/*
 * Find an associated nfs write request, and prepare to flush it out
 * May return an error if the user signalled nfs_wait_on_request().
 */


static int nfs_page_async_flush(struct nfs_pageio_descriptor *pgio,
				struct page *page, bool nonblock,
				bool launder)
{
	struct nfs_page *req;
	int ret = 0;

	req = nfs_lock_and_join_requests(page, nonblock);
	if (!req)
		goto out;
	ret = PTR_ERR(req);
	if (IS_ERR(req))
		goto out;

	nfs_set_page_writeback(page);
	WARN_ON_ONCE(test_bit(PG_CLEAN, &req->wb_flags));

	ret = 0;
	if (!nfs_pageio_add_request(pgio, req)) {
		ret = pgio->pg_error;
		/*
                 * Remove the problematic req upon fatal errors
                 * in launder case, while other dirty pages can
                 * still be around until they get flushed.
                 */
		if (nfs_error_is_fatal(ret)) {
			nfs_context_set_write_error(req->wb_context, ret);
			if (launder) {
				nfs_write_error_remove_page(req);
				goto out;
			}
		}
		nfs_redirty_request(req);
		ret = -EAGAIN;
	} else
		nfs_add_stats(page_file_mapping(page)->host,
				NFSIOS_WRITEPAGES, 1);
out:
	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Trond Myklebust
114
67.46%
8
66.67%
Peng Tao
44
26.04%
2
16.67%
Fred Isaman
10
5.92%
1
8.33%
Weston Andros Adamson
1
0.59%
1
8.33%
Total
169
100.00%
12
100.00%



static int nfs_do_writepage(struct page *page, struct writeback_control *wbc,
			    struct nfs_pageio_descriptor *pgio, bool launder)
{
	int ret;

	nfs_pageio_cond_complete(pgio, page_index(page));
	ret = nfs_page_async_flush(pgio, page, wbc->sync_mode == WB_SYNC_NONE,
				   launder);
	if (ret == -EAGAIN) {
		redirty_page_for_writepage(wbc, page);
		ret = 0;
	}
	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Trond Myklebust
58
75.32%
5
45.45%
Linus Torvalds (pre-git)
6
7.79%
2
18.18%
Peng Tao
5
6.49%
1
9.09%
Andrew Morton
5
6.49%
1
9.09%
Mel Gorman
2
2.60%
1
9.09%
Huang Ying
1
1.30%
1
9.09%
Total
77
100.00%
11
100.00%

/*
 * Write an mmapped page to the server.
 */


static int nfs_writepage_locked(struct page *page,
				struct writeback_control *wbc,
				bool launder)
{
	struct nfs_pageio_descriptor pgio;
	struct inode *inode = page_file_mapping(page)->host;
	int err;

	nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGE);
	nfs_pageio_init_write(&pgio, inode, 0,
				false, &nfs_async_write_completion_ops);
	err = nfs_do_writepage(page, wbc, &pgio, launder);
	nfs_pageio_complete(&pgio);
	if (err < 0)
		return err;
	if (pgio.pg_error < 0)
		return pgio.pg_error;
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Trond Myklebust
94
89.52%
8
72.73%
Peng Tao
5
4.76%
1
9.09%
Fred Isaman
3
2.86%
1
9.09%
Christoph Hellwig
3
2.86%
1
9.09%
Total
105
100.00%
11
100.00%



int nfs_writepage(struct page *page, struct writeback_control *wbc)
{
	int ret;

	ret = nfs_writepage_locked(page, wbc, false);
	unlock_page(page);
	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Trond Myklebust
29
78.38%
2
33.33%
Linus Torvalds (pre-git)
5
13.51%
2
33.33%
Peng Tao
2
5.41%
1
16.67%
Andrew Morton
1
2.70%
1
16.67%
Total
37
100.00%
6
100.00%



static int nfs_writepages_callback(struct page *page, struct writeback_control *wbc, void *data)
{
	int ret;

	ret = nfs_do_writepage(page, wbc, data, false);
	unlock_page(page);
	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Trond Myklebust
40
90.91%
1
25.00%
Linus Torvalds (pre-git)
2
4.55%
2
50.00%
Peng Tao
2
4.55%
1
25.00%
Total
44
100.00%
4
100.00%



int nfs_writepages(struct address_space *mapping, struct writeback_control *wbc)
{
	struct inode *inode = mapping->host;
	struct nfs_pageio_descriptor pgio;
	int err;

	nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGES);

	nfs_pageio_init_write(&pgio, inode, wb_priority(wbc), false,
				&nfs_async_write_completion_ops);
	err = write_cache_pages(mapping, wbc, nfs_writepages_callback, &pgio);
	nfs_pageio_complete(&pgio);

	if (err < 0)
		goto out_err;
	err = pgio.pg_error;
	if (err < 0)
		goto out_err;
	return 0;
out_err:
	return err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Trond Myklebust
95
87.96%
7
70.00%
Chuck Lever
7
6.48%
1
10.00%
Christoph Hellwig
3
2.78%
1
10.00%
Fred Isaman
3
2.78%
1
10.00%
Total
108
100.00%
10
100.00%

/*
 * Insert a write request into an inode
 */


static void nfs_inode_add_request(struct inode *inode, struct nfs_page *req)
{
	struct nfs_inode *nfsi = NFS_I(inode);

	WARN_ON_ONCE(req->wb_this_page != req);

	/* Lock the request! */
	nfs_lock_request(req);

	spin_lock(&inode->i_lock);
	if (!nfsi->nrequests &&
	    NFS_PROTO(inode)->have_delegation(inode, FMODE_WRITE))
		inode->i_version++;
	/*
         * Swap-space should not get truncated. Hence no need to plug the race
         * with invalidate/truncate.
         */
	if (likely(!PageSwapCache(req->wb_page))) {
		set_bit(PG_MAPPED, &req->wb_flags);
		SetPagePrivate(req->wb_page);
		set_page_private(req->wb_page, (unsigned long)req);
	}
	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
         * adding subrequests. */
	WARN_ON(test_and_set_bit(PG_INODE_REF, &req->wb_flags));
	kref_get(&req->wb_kref);
	spin_unlock(&inode->i_lock);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Trond Myklebust
70
45.45%
11
47.83%
Weston Andros Adamson
25
16.23%
3
13.04%
Linus Torvalds (pre-git)
24
15.58%
5
21.74%
Mel Gorman
16
10.39%
1
4.35%
Linus Torvalds
12
7.79%
1
4.35%
Bryan Schumaker
6
3.90%
1
4.35%
Fred Isaman
1
0.65%
1
4.35%
Total
154
100.00%
23
100.00%

/*
 * Remove a write request from an inode
 */


static void nfs_inode_remove_request(struct nfs_page *req)
{
	struct inode *inode = d_inode(req->wb_context->dentry);
	struct nfs_inode *nfsi = NFS_I(inode);
	struct nfs_page *head;

	if (nfs_page_group_sync_on_bit(req, PG_REMOVE)) {
		head = req->wb_head;

		spin_lock(&inode->i_lock);
		if (likely(head->wb_page && !PageSwapCache(head->wb_page))) {
			set_page_private(head->wb_page, 0);
			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);
	}

	if (test_and_clear_bit(PG_INODE_REF, &req->wb_flags))
		nfs_release_request(req);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Weston Andros Adamson
63
38.41%
3
17.65%
Trond Myklebust
45
27.44%
7
41.18%
Linus Torvalds (pre-git)
31
18.90%
3
17.65%
Mel Gorman
14
8.54%
1
5.88%
Anna Schumaker
4
2.44%
1
5.88%
Linus Torvalds
4
2.44%
1
5.88%
David Howells
3
1.83%
1
5.88%
Total
164
100.00%
17
100.00%


static void

nfs_mark_request_dirty(struct nfs_page *req)
{
	if (req->wb_page)
		__set_page_dirty_nobuffers(req->wb_page);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Trond Myklebust
17
70.83%
1
33.33%
Anna Schumaker
6
25.00%
1
33.33%
Fred Isaman
1
4.17%
1
33.33%
Total
24
100.00%
3
100.00%

/*
 * nfs_page_search_commits_for_head_request_locked
 *
 * Search through commit lists on @inode for the head request for @page.
 * Must be called while holding the inode (which is cinfo) lock.
 *
 * Returns the head request if found, or NULL if not found.
 */

static struct nfs_page *

nfs_page_search_commits_for_head_request_locked(struct nfs_inode *nfsi,
						struct page *page)
{
	struct nfs_page *freq, *t;
	struct nfs_commit_info cinfo;
	struct inode *inode = &nfsi->vfs_inode;

	nfs_init_cinfo_from_inode(&cinfo, inode);

	/* search through pnfs commit lists */
	freq = pnfs_search_commit_reqs(inode, &cinfo, page);
	if (freq)
		return freq->wb_head;

	/* Linearly search the commit list for the correct request */
	list_for_each_entry_safe(freq, t, &cinfo.mds->list, wb_list) {
		if (freq->wb_page == page)
			return freq->wb_head;
	}

	return NULL;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Trond Myklebust
99
100.00%
1
100.00%
Total
99
100.00%
1
100.00%

/**
 * nfs_request_add_commit_list_locked - add request to a commit list
 * @req: pointer to a struct nfs_page
 * @dst: commit list head
 * @cinfo: holds list lock and accounting info
 *
 * This sets the PG_CLEAN bit, updates the cinfo count of
 * number of outstanding requests requiring a commit as well as
 * the MM page stats.
 *
 * The caller must hold cinfo->inode->i_lock, and the nfs_page lock.
 */

void

nfs_request_add_commit_list_locked(struct nfs_page *req, struct list_head *dst,
			    struct nfs_commit_info *cinfo)
{
	set_bit(PG_CLEAN, &req->wb_flags);
	nfs_list_add_request(req, dst);
	cinfo->mds->ncommit++;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Trond Myklebust
22
50.00%
6
50.00%
Fred Isaman
14
31.82%
3
25.00%
Linus Torvalds (pre-git)
8
18.18%
3
25.00%
Total
44
100.00%
12
100.00%


EXPORT_SYMBOL_GPL(nfs_request_add_commit_list_locked);

/**
 * nfs_request_add_commit_list - add request to a commit list
 * @req: pointer to a struct nfs_page
 * @dst: commit list head
 * @cinfo: holds list lock and accounting info
 *
 * This sets the PG_CLEAN bit, updates the cinfo count of
 * number of outstanding requests requiring a commit as well as
 * the MM page stats.
 *
 * The caller must _not_ hold the cinfo->lock, but must be
 * holding the nfs_page lock.
 */

void

nfs_request_add_commit_list(struct nfs_page *req, struct nfs_commit_info *cinfo)
{
	spin_lock(&cinfo->inode->i_lock);
	nfs_request_add_commit_list_locked(req, &cinfo->mds->list, cinfo);
	spin_unlock(&cinfo->inode->i_lock);
	if (req->wb_page)
		nfs_mark_page_unstable(req->wb_page, cinfo);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Trond Myklebust
30
46.88%
2
13.33%
Anna Schumaker
12
18.75%
2
13.33%
Dave Wysochanski
8
12.50%
1
6.67%
Linus Torvalds (pre-git)
3
4.69%
3
20.00%
Fred Isaman
3
4.69%
2
13.33%
Peter Zijlstra
3
4.69%
1
6.67%
Mel Gorman
2
3.12%
1
6.67%
Linus Torvalds
2
3.12%
2
13.33%
Tom Haynes
1
1.56%
1
6.67%
Total
64
100.00%
15
100.00%


EXPORT_SYMBOL_GPL(nfs_request_add_commit_list);

/**
 * nfs_request_remove_commit_list - Remove request from a commit list
 * @req: pointer to a nfs_page
 * @cinfo: holds list lock and accounting info
 *
 * This clears the PG_CLEAN bit, and updates the cinfo's count of
 * number of outstanding requests requiring a commit
 * It does not update the MM page stats.
 *
 * The caller _must_ hold the cinfo->lock and the nfs_page lock.
 */

void

nfs_request_remove_commit_list(struct nfs_page *req,
			       struct nfs_commit_info *cinfo)
{
	if (!test_and_clear_bit(PG_CLEAN, &(req)->wb_flags))
		return;
	nfs_list_remove_request(req);
	cinfo->mds->ncommit--;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Trond Myklebust
35
81.40%
1
50.00%
Fred Isaman
8
18.60%
1
50.00%
Total
43
100.00%
2
100.00%


EXPORT_SYMBOL_GPL(nfs_request_remove_commit_list);



static void nfs_init_cinfo_from_inode(struct nfs_commit_info *cinfo,
				      struct inode *inode)
{
	cinfo->inode = inode;
	cinfo->mds = &NFS_I(inode)->commit_info;
	cinfo->ds = pnfs_get_ds_info(inode);
	cinfo->dreq = NULL;
	cinfo->completion_ops = &nfs_commit_completion_ops;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Fred Isaman
55
98.21%
3
75.00%
Dave Wysochanski
1
1.79%
1
25.00%
Total
56
100.00%
4
100.00%



void nfs_init_cinfo(struct nfs_commit_info *cinfo,
		    struct inode *inode,
		    struct nfs_direct_req *dreq)
{
	if (dreq)
		nfs_init_cinfo_from_dreq(cinfo, dreq);
	else
		nfs_init_cinfo_from_inode(cinfo, inode);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Fred Isaman
39
100.00%
2
100.00%
Total
39
100.00%
2
100.00%


EXPORT_SYMBOL_GPL(nfs_init_cinfo);

/*
 * Add a request to the inode's commit list.
 */

void

nfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg,
			struct nfs_commit_info *cinfo, u32 ds_commit_idx)
{
	if (pnfs_mark_request_commit(req, lseg, cinfo, ds_commit_idx))
		return;
	nfs_request_add_commit_list(req, cinfo);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Trond Myklebust
31
70.45%
1
33.33%
Fred Isaman
8
18.18%
1
33.33%
Weston Andros Adamson
5
11.36%
1
33.33%
Total
44
100.00%
3
100.00%


static void

nfs_clear_page_commit(struct page *page)
{
	dec_node_page_state(page, NR_UNSTABLE_NFS);
	dec_wb_stat(&inode_to_bdi(page_file_mapping(page)->host)->wb,
		    WB_RECLAIMABLE);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Fred Isaman
22
61.11%
1
16.67%
Tejun Heo
5
13.89%
1
16.67%
Christoph Hellwig
4
11.11%
1
16.67%
Mel Gorman
4
11.11%
2
33.33%
Trond Myklebust
1
2.78%
1
16.67%
Total
36
100.00%
6
100.00%

/* Called holding inode (/cinfo) lock */

static void

nfs_clear_request_commit(struct nfs_page *req)
{
	if (test_bit(PG_CLEAN, &req->wb_flags)) {
		struct inode *inode = d_inode(req->wb_context->dentry);
		struct nfs_commit_info cinfo;

		nfs_init_cinfo_from_inode(&cinfo, inode);
		if (!pnfs_clear_request_commit(req, &cinfo)) {
			nfs_request_remove_commit_list(req, &cinfo);
		}
		nfs_clear_page_commit(req->wb_page);
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Trond Myklebust
50
63.29%
2
40.00%
Fred Isaman
26
32.91%
2
40.00%
David Howells
3
3.80%
1
20.00%
Total
79
100.00%
5
100.00%



int nfs_write_need_commit(struct nfs_pgio_header *hdr)
{
	if (hdr->verf.committed == NFS_DATA_SYNC)
		return hdr->lseg == NULL;
	return hdr->verf.committed != NFS_FILE_SYNC;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Trond Myklebust
16
44.44%
1
25.00%
Fred Isaman
15
41.67%
2
50.00%
Weston Andros Adamson
5
13.89%
1
25.00%
Total
36
100.00%
4
100.00%



static void nfs_write_completion(struct nfs_pgio_header *hdr)
{
	struct nfs_commit_info cinfo;
	unsigned long bytes = 0;

	if (test_bit(NFS_IOHDR_REDO, &hdr->flags))
		goto out;
	nfs_init_cinfo_from_inode(&cinfo, hdr->inode);
	while (!list_empty(&hdr->pages)) {
		struct nfs_page *req = nfs_list_entry(hdr->pages.next);

		bytes += req->wb_bytes;
		nfs_list_remove_request(req);
		if (test_bit(NFS_IOHDR_ERROR, &hdr->flags) &&
		    (hdr->good_bytes < bytes)) {
			nfs_set_pageerror(req->wb_page);
			nfs_context_set_write_error(req->wb_context, hdr->error);
			goto remove_req;
		}
		if (nfs_write_need_commit(hdr)) {
			memcpy(&req->wb_verf, &hdr->verf.verifier, sizeof(req->wb_verf));
			nfs_mark_request_commit(req, hdr->lseg, &cinfo,
				hdr->pgio_mirror_idx);
			goto next;
		}
remove_req:
		nfs_inode_remove_request(req);
next:
		nfs_unlock_request(req);
		nfs_end_page_writeback(req);
		nfs_release_request(req);
	}
out:
	hdr->release(hdr);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Fred Isaman
152
72.38%
5
33.33%
Trond Myklebust
52
24.76%
6
40.00%
Weston Andros Adamson
5
2.38%
3
20.00%
Anna Schumaker
1
0.48%
1
6.67%
Total
210
100.00%
15
100.00%


unsigned long

nfs_reqs_to_commit(struct nfs_commit_info *cinfo)
{
	return cinfo->mds->ncommit;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Fred Isaman
12
66.67%
2
66.67%
Trond Myklebust
6
33.33%
1
33.33%
Total
18
100.00%
3
100.00%

/* cinfo->inode->i_lock held by caller */

int

nfs_scan_commit_list(struct list_head *src, struct list_head *dst,
		     struct nfs_commit_info *cinfo, int max)
{
	struct nfs_page *req, *tmp;
	int ret = 0;

	list_for_each_entry_safe(req, tmp, src, wb_list) {
		if (!nfs_lock_request(req))
			continue;
		kref_get(&req->wb_kref);
		if (cond_resched_lock(&cinfo->inode->i_lock))
			list_safe_reset_next(req, tmp, wb_list);
		nfs_request_remove_commit_list(req, cinfo);
		nfs_list_add_request(req, dst);
		ret++;
		if ((ret == max) && !cinfo->dreq)
			break;
	}
	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Fred Isaman
85
70.83%
3
37.50%
Trond Myklebust
31
25.83%
4
50.00%
Dave Wysochanski
4
3.33%
1
12.50%
Total
120
100.00%
8
100.00%

/*
 * nfs_scan_commit - Scan an inode for commit requests
 * @inode: NFS inode to scan
 * @dst: mds destination list
 * @cinfo: mds and ds lists of reqs ready to commit
 *
 * Moves requests from the inode's 'commit' request list.
 * The requests are *not* checked to ensure that they form a contiguous set.
 */

int

nfs_scan_commit(struct inode *inode, struct list_head *dst,
		struct nfs_commit_info *cinfo)
{
	int ret = 0;

	spin_lock(&cinfo->inode->i_lock);
	if (cinfo->mds->ncommit > 0) {
		const int max = INT_MAX;

		ret = nfs_scan_commit_list(&cinfo->mds->list, dst,
					   cinfo, max);
		ret += pnfs_scan_commit_lists(inode, cinfo, max - ret);
	}
	spin_unlock(&cinfo->inode->i_lock);
	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Fred Isaman
41
42.27%
3
21.43%
Trond Myklebust
18
18.56%
6
42.86%
Linus Torvalds (pre-git)
13
13.40%
1
7.14%
Dave Chinner
10
10.31%
1
7.14%
Dave Wysochanski
8
8.25%
1
7.14%
Linus Torvalds
7
7.22%
2
14.29%
Total
97
100.00%
14
100.00%

/*
 * Search for an existing write request, and attempt to update
 * it to reflect a new dirty region on a given page.
 *
 * If the attempt fails, then the existing request is flushed out
 * to disk.
 */


static struct nfs_page *nfs_try_to_update_request(struct inode *inode,
		struct page *page,
		unsigned int offset,
		unsigned int bytes)
{
	struct nfs_page *req;
	unsigned int rqend;
	unsigned int end;
	int error;

	if (!PagePrivate(page))
		return NULL;

	end = offset + bytes;
	spin_lock(&inode->i_lock);

	for (;;) {
		req = nfs_page_find_head_request_locked(NFS_I(inode), page);
		if (req == NULL)
			goto out_unlock;

		/* should be handled by nfs_flush_incompatible */
		WARN_ON_ONCE(req->wb_head != req);
		WARN_ON_ONCE(req->wb_this_page != req);

		rqend = req->wb_offset + req->wb_bytes;
		/*
                 * Tell the caller to flush out the request if
                 * the offsets are non-contiguous.
                 * Note: nfs_flush_incompatible() will already
                 * have flushed out requests having wrong owners.
                 */
		if (offset > rqend
		    || end < req->wb_offset)
			goto out_flushme;

		if (nfs_lock_request(req))
			break;

		/* The request is locked, so wait and then retry */
		spin_unlock(&inode->i_lock);
		error = nfs_wait_on_request(req);
		nfs_release_request(req);
		if (error != 0)
			goto out_err;
		spin_lock(&inode->i_lock);
	}

	/* Okay, the request matches. Update the region */
	if (offset < req->wb_offset) {
		req->wb_offset = offset;
		req->wb_pgbase = offset;
	}
	if (end > rqend)
		req->wb_bytes = end - req->wb_offset;
	else
		req->wb_bytes = rqend - req->wb_offset;
out_unlock:
	if (req)
		nfs_clear_request_commit(req);
	spin_unlock(&inode->i_lock);
	return req;
out_flushme:
	spin_unlock(&inode->i_lock);
	nfs_release_request(req);
	error = nfs_wb_page(inode, page);
out_err:
	return ERR_PTR(error);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Trond Myklebust
157
54.14%
7
41.18%
Linus Torvalds (pre-git)
83
28.62%
2
11.76%
Weston Andros Adamson
28
9.66%
3
17.65%
Linus Torvalds
7
2.41%
1
5.88%
Fred Isaman
7
2.41%
2
11.76%
Mel Gorman
5
1.72%
1
5.88%
Nicholas Piggin
3
1.03%
1
5.88%
Total
290
100.00%
17
100.00%

/*
 * Try to update an existing write request, or create one if there is none.
 *
 * Note: Should always be called with the Page Lock held to prevent races
 * if we have to add a new request. Also assumes that the caller has
 * already called nfs_flush_incompatible() if necessary.
 */


static struct nfs_page * nfs_setup_write_request(struct nfs_open_context* ctx,
		struct page *page, unsigned int offset, unsigned int bytes)
{
	struct inode *inode = page_file_mapping(page)->host;
	struct nfs_page	*req;

	req = nfs_try_to_update_request(inode, page, offset, bytes);
	if (req != NULL)
		goto out;
	req = nfs_create_request(ctx, page, NULL, offset, bytes);
	if (IS_ERR(req))
		goto out;
	nfs_inode_add_request(inode, req);
out:
	return req;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Trond Myklebust
77
75.49%
4
44.44%
Linus Torvalds (pre-git)
17
16.67%
2
22.22%
Mel Gorman
3
2.94%
1
11.11%
Linus Torvalds
3
2.94%
1
11.11%
Weston Andros Adamson
2
1.96%
1
11.11%
Total
102
100.00%
9
100.00%



static int nfs_writepage_setup(struct nfs_open_context *ctx, struct page *page,
		unsigned int offset, unsigned int count)
{
	struct nfs_page	*req;

	req = nfs_setup_write_request(ctx, page, offset, count);
	if (IS_ERR(req))
		return PTR_ERR(req);
	/* Update file length */
	nfs_grow_file(page, offset, count);
	nfs_mark_uptodate(req);
	nfs_mark_request_dirty(req);
	nfs_unlock_and_release_request(req);
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Trond Myklebust
63
75.90%
4
80.00%
Linus Torvalds (pre-git)
20
24.10%
1
20.00%
Total
83
100.00%
5
100.00%



int nfs_flush_incompatible(struct file *file, struct page *page)
{
	struct nfs_open_context *ctx = nfs_file_open_context(file);
	struct nfs_lock_context *l_ctx;
	struct file_lock_context *flctx = file_inode(file)->i_flctx;
	struct nfs_page	*req;
	int do_flush, status;
	/*
         * Look for a request corresponding to this page. If there
         * is one, and it belongs to another file, we flush it out
         * before we try to copy anything into the page. Do this
         * due to the lack of an ACCESS-type call in NFSv2.
         * Also do the same if we find a request from an existing
         * dropped page.
         */
	do {
		req = nfs_page_find_head_request(page);
		if (req == NULL)
			return 0;
		l_ctx = req->wb_lock_context;
		do_flush = req->wb_page != page ||
			!nfs_match_open_context(req->wb_context, ctx);
		/* for now, flush if more than 1 request in page_group */
		do_flush |= req->wb_this_page != req;
		if (l_ctx && flctx &&
		    !(list_empty_careful(&flctx->flc_posix) &&
		      list_empty_careful(&flctx->flc_flock))) {
			do_flush |= l_ctx->lockowner != current->files;
		}
		nfs_release_request(req);
		if (!do_flush)
			return 0;
		status = nfs_wb_page(page_file_mapping(page)->host, page);
	} while (status == 0);
	return status;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Trond Myklebust
73
40.78%
8
57.14%
Linus Torvalds (pre-git)
48
26.82%
1
7.14%
Jeff Layton
45
25.14%
2
14.29%
Weston Andros Adamson
10
5.59%
2
14.29%
Mel Gorman
3
1.68%
1
7.14%
Total
179
100.00%
14
100.00%

/*
 * Avoid buffered writes when a open context credential's key would
 * expire soon.
 *
 * Returns -EACCES if the key will expire within RPC_KEY_EXPIRE_FAIL.
 *
 * Return 0 and set a credential flag which triggers the inode to flush
 * and performs  NFS_FILE_SYNC writes if the key will expired within
 * RPC_KEY_EXPIRE_TIMEO.
 */

int

nfs_key_timeout_notify(struct file *filp, struct inode *inode)
{
	struct nfs_open_context *ctx = nfs_file_open_context(filp);
	struct rpc_auth *auth = NFS_SERVER(inode)->client->cl_auth;

	return rpcauth_key_timeout_notify(auth, ctx->cred);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Andy Adamson
49
100.00%
1
100.00%
Total
49
100.00%
1
100.00%

/*
 * Test if the open context credential key is marked to expire soon.
 */


bool nfs_ctx_key_to_expire(struct nfs_open_context *ctx, struct inode *inode)
{
	struct rpc_auth *auth = NFS_SERVER(inode)->client->cl_auth;

	return rpcauth_cred_key_to_expire(auth, ctx->cred);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Scott Mayhew
21
53.85%
1
50.00%
Andy Adamson
18
46.15%
1
50.00%
Total
39
100.00%
2
100.00%

/*
 * If the page cache is marked as unsafe or invalid, then we can't rely on
 * the PageUptodate() flag. In this case, we will need to turn off
 * write optimisations that depend on the page contents being correct.
 */


static bool nfs_write_pageuptodate(struct page *page, struct inode *inode)
{
	struct nfs_inode *nfsi = NFS_I(inode);

	if (nfs_have_delegated_attributes(inode))
		goto out;
	if (nfsi->cache_validity & NFS_INO_REVAL_PAGECACHE)
		return false;
	smp_rmb();
	if (test_bit(NFS_INO_INVALIDATING, &nfsi->flags))
		return false;
out:
	if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
		return false;
	return PageUptodate(page) != 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Trond Myklebust
46
53.49%
2
40.00%
Jeff Layton
29
33.72%
2
40.00%
Scott Mayhew
11
12.79%
1
20.00%
Total
86
100.00%
5
100.00%


static bool

is_whole_file_wrlock(struct file_lock *fl)
{
	return fl->fl_start == 0 && fl->fl_end == OFFSET_MAX &&
			fl->fl_type == F_WRLCK;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jeff Layton
30
100.00%
1
100.00%
Total
30
100.00%
1
100.00%

/* If we know the page is up to date, and we're not using byte range locks (or
 * if we have the whole file locked for writing), it may be more efficient to
 * extend the write to cover the entire page in order to avoid fragmentation
 * inefficiencies.
 *
 * If the file is opened for synchronous writes then we can just skip the rest
 * of the checks.
 */


static int nfs_can_extend_write(struct file *file, struct page *page, struct inode *inode)
{
	int ret;
	struct file_lock_context *flctx = inode->i_flctx;
	struct file_lock *fl;

	if (file->f_flags & O_DSYNC)
		return 0;
	if (!nfs_write_pageuptodate(page, inode))
		return 0;
	if (NFS_PROTO(inode)->have_delegation(inode, FMODE_WRITE))
		return 1;
	if (!flctx || (list_empty_careful(&flctx->flc_flock) &&
		       list_empty_careful(&flctx->flc_posix)))
		return 1;

	/* Check to see if there are whole file write locks */
	ret = 0;
	spin_lock(&flctx->flc_lock);
	if (!list_empty(&flctx->flc_posix)) {
		fl = list_first_entry(&flctx->flc_posix, struct file_lock,
					fl_list);
		if (is_whole_file_wrlock(fl))
			ret = 1;
	} else if (!list_empty(&flctx->flc_flock)) {
		fl = list_first_entry(&flctx->flc_flock, struct file_lock,
					fl_list);
		if (fl->fl_type == F_WRLCK)
			ret = 1;
	}
	spin_unlock(&flctx->flc_lock);
	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jeff Layton
134
64.11%
3
50.00%
Scott Mayhew
74
35.41%
2
33.33%
Trond Myklebust
1
0.48%
1
16.67%
Total
209
100.00%
6
100.00%

/*
 * Update and possibly write a cached page of an NFS file.
 *
 * XXX: Keep an eye on generic_file_read to make sure it doesn't do bad
 * things with a page scheduled for an RPC call (e.g. invalidate it).
 */


int nfs_updatepage(struct file *file, struct page *page,
		unsigned int offset, unsigned int count)
{
	struct nfs_open_context *ctx = nfs_file_open_context(file);
	struct inode	*inode = page_file_mapping(page)->host;
	int		status = 0;

	nfs_inc_stats(inode, NFSIOS_VFSUPDATEPAGE);

	dprintk("NFS:       nfs_updatepage(%pD2 %d@%lld)\n",
		file, count, (long long)(page_file_offset(page) + offset));

	if (!count)
		goto out;

	if (nfs_can_extend_write(file, page, inode)) {
		count = max(count + offset, nfs_page_length(page));
		offset = 0;
	}

	status = nfs_writepage_setup(ctx, page, offset, count);
	if (status < 0)
		nfs_set_pageerror(page);
	else
		__set_page_dirty_nobuffers(page);
out:
	dprintk("NFS:       nfs_updatepage returns %d (isize %lld)\n",
			status, (long long)i_size_read(inode));
	return status;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
72
42.60%
3
13.64%
Trond Myklebust
63
37.28%
10
45.45%
Benjamin Coddington
10
5.92%
1
4.55%
Chuck Lever
9
5.33%
3
13.64%
Linus Torvalds
4
2.37%
1
4.55%
Mel Gorman
4
2.37%
1
4.55%
Scott Mayhew
3
1.78%
1
4.55%
Andrew Morton
3
1.78%
1
4.55%
Al Viro
1
0.59%
1
4.55%
Total
169
100.00%
22
100.00%



static int flush_task_priority(int how)
{
	switch (how & (FLUSH_HIGHPRI|FLUSH_LOWPRI)) {
		case FLUSH_HIGHPRI:
			return RPC_PRIORITY_HIGH;
		case FLUSH_LOWPRI:
			return RPC_PRIORITY_LOW;
	}
	return RPC_PRIORITY_NORMAL;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Trond Myklebust
31
86.11%
2
66.67%
Fred Isaman
5
13.89%
1
33.33%
Total
36
100.00%
3
100.00%



static void nfs_initiate_write(struct nfs_pgio_header *hdr,
			       struct rpc_message *msg,
			       const struct nfs_rpc_ops *rpc_ops,
			       struct rpc_task_setup *task_setup_data, int how)
{
	int priority = flush_task_priority(how);

	task_setup_data->priority = priority;
	rpc_ops->write_setup(hdr, msg);

	nfs4_state_protect_write(NFS_SERVER(hdr->inode)->nfs_client,
				 &task_setup_data->rpc_client, msg, hdr);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Weston Andros Adamson
21
28.38%
2
16.67%
Trond Myklebust
20
27.03%
6
50.00%
Tom Haynes
9
12.16%
1
8.33%
Linus Torvalds (pre-git)
8
10.81%
1
8.33%
Anna Schumaker
8
10.81%
1
8.33%
Andy Adamson
8
10.81%
1
8.33%
Total
74
100.00%
12
100.00%

/* If a nfs_flush_* function fails, it should remove reqs from @head and
 * call this on each, which will prepare them to be retried on next
 * writeback using standard nfs.
 */


static void nfs_redirty_request(struct nfs_page *req)
{
	nfs_mark_request_dirty(req);
	set_bit(NFS_CONTEXT_RESEND_WRITES, &req->wb_context->flags);
	nfs_unlock_request(req);
	nfs_end_page_writeback(req);
	nfs_release_request(req);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Trond Myklebust
32
74.42%
7
70.00%
Fred Isaman
7
16.28%
1
10.00%
Bryan Schumaker
3
6.98%
1
10.00%
Linus Torvalds (pre-git)
1
2.33%
1
10.00%
Total
43
100.00%
10
100.00%



static void nfs_async_write_error(struct list_head *head)
{
	struct nfs_page	*req;

	while (!list_empty(head)) {
		req = nfs_list_entry(head->next);
		nfs_list_remove_request(req);
		nfs_redirty_request(req);
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Fred Isaman
30
66.67%
2
28.57%
Trond Myklebust
14
31.11%
4
57.14%
Linus Torvalds (pre-git)
1
2.22%
1
14.29%
Total
45
100.00%
7
100.00%



static void nfs_async_write_reschedule_io(struct nfs_pgio_header *hdr)
{
	nfs_async_write_error(&hdr->pages);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Trond Myklebust
19
100.00%
1
100.00%
Total
19
100.00%
1
100.00%


static const struct nfs_pgio_completion_ops nfs_async_write_completion_ops = {
	.error_cleanup = nfs_async_write_error,
	.completion = nfs_write_completion,
	.reschedule_io = nfs_async_write_reschedule_io,
};



void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio,
			       struct inode *inode, int ioflags, bool force_mds,
			       const struct nfs_pgio_completion_ops *compl_ops)
{
	struct nfs_server *server = NFS_SERVER(inode);
	const struct nfs_pageio_ops *pg_ops = &nfs_pgio_rw_ops;

#ifdef CONFIG_NFS_V4_1
	if (server->pnfs_curr_ld && !force_mds)
		pg_ops = server->pnfs_curr_ld->pg_write_ops;
#endif
	nfs_pageio_init(pgio, inode, pg_ops, compl_ops, &nfs_rw_write_ops,
			server->wsize, ioflags);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Hellwig
45
51.14%
1
10.00%
Trond Myklebust
23
26.14%
3
30.00%
Fred Isaman
8
9.09%
1
10.00%
Linus Torvalds (pre-git)
5
5.68%
1
10.00%
Anna Schumaker
4
4.55%
2
20.00%
Linus Torvalds
2
2.27%
1
10.00%
Bryan Schumaker
1
1.14%
1
10.00%
Total
88
100.00%
10
100.00%


EXPORT_SYMBOL_GPL(nfs_pageio_init_write);



void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio)
{
	struct nfs_pgio_mirror *mirror;

	if (pgio->pg_ops && pgio->pg_ops->pg_cleanup)
		pgio->pg_ops->pg_cleanup(pgio);

	pgio->pg_ops = &nfs_pgio_rw_ops;

	nfs_pageio_stop_mirroring(pgio);

	mirror = &pgio->pg_mirrors[0];
	mirror->pg_bsize = NFS_SERVER(pgio->pg_inode)->wsize;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Trond Myklebust
31
43.66%
1
25.00%
Kinglong Mee
21
29.58%
1
25.00%
Weston Andros Adamson
18
25.35%
1
25.00%
Anna Schumaker
1
1.41%
1
25.00%
Total
71
100.00%
4
100.00%


EXPORT_SYMBOL_GPL(nfs_pageio_reset_write_mds);




void nfs_commit_prepare(struct rpc_task *task, void *calldata)
{
	struct nfs_commit_data *data = calldata;

	NFS_PROTO(data->inode)->commit_rpc_prepare(task, data);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Fred Isaman
26
74.29%
2
40.00%
Chuck Lever
4
11.43%
1
20.00%
Trond Myklebust
3
8.57%
1
20.00%
Linus Torvalds (pre-git)
2
5.71%
1
20.00%
Total
35
100.00%
5
100.00%

/*
 * Special version of should_remove_suid() that ignores capabilities.
 */


static int nfs_should_remove_suid(const struct inode *inode)
{
	umode_t mode = inode->i_mode;
	int kill = 0;

	/* suid always must be killed */
	if (unlikely(mode & S_ISUID))
		kill = ATTR_KILL_SUID;

	/*
         * sgid without any exec bits is just a mandatory locking mark; leave
         * it alone.  If some exec bits are set, it's a real sgid; kill it.
         */
	if (unlikely((mode & S_ISGID) && (mode & S_IXGRP)))
		kill |= ATTR_KILL_SGID;

	if (unlikely(kill && S_ISREG(mode)))
		return kill;

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Trond Myklebust
78
100.00%
2
100.00%
Total
78
100.00%
2
100.00%



static void nfs_writeback_check_extend(struct nfs_pgio_header *hdr,
		struct nfs_fattr *fattr)
{
	struct nfs_pgio_args *argp = &hdr->args;
	struct nfs_pgio_res *resp = &hdr->res;
	u64 size = argp->offset + resp->count;

	if (!(fattr->valid & NFS_ATTR_FATTR_SIZE))
		fattr->size = size;
	if (nfs_size_to_loff_t(fattr->size) < i_size_read(hdr->inode)) {
		fattr->valid &= ~NFS_ATTR_FATTR_SIZE;
		return;
	}
	if (size != fattr->size)
		return;
	/* Set attribute barrier */
	nfs_fattr_set_barrier(fattr);
	/* ...and update size */
	fattr->valid |= NFS_ATTR_FATTR_SIZE;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Trond Myklebust
112
100.00%
2
100.00%
Total
112
100.00%
2
100.00%



void nfs_writeback_update_inode(struct nfs_pgio_header *hdr)
{
	struct nfs_fattr *fattr = &hdr->fattr;
	struct inode *inode = hdr->inode;

	spin_lock(&inode->i_lock);
	nfs_writeback_check_extend(hdr, fattr);
	nfs_post_op_update_inode_force_wcc_locked(inode, fattr);
	spin_unlock(&inode->i_lock);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Trond Myklebust
59
100.00%
2
100.00%
Total
59
100.00%
2
100.00%


EXPORT_SYMBOL_GPL(nfs_writeback_update_inode);

/*
 * This function is called when the WRITE call is complete.
 */


static int nfs_writeback_done(struct rpc_task *task,
			      struct nfs_pgio_header *hdr,
			      struct inode *inode)
{
	int status;

	/*
         * ->write_done will attempt to use post-op attributes to detect
         * conflicting writes by other clients.  A strict interpretation
         * of close-to-open would allow us to continue caching even if
         * another writer had changed the file, but some applications
         * depend on tighter cache coherency when writing.
         */
	status = NFS_PROTO(inode)->write_done(task, hdr);
	if (status != 0)
		return status;
	nfs_add_stats(inode, NFSIOS_SERVERWRITTENBYTES, hdr->res.count);

	if (hdr->res.verf->committed < hdr->args.stable &&
	    task->tk_status >= 0) {
		/* We tried a write call, but the server did not
                 * commit data to stable storage even though we
                 * requested it.
                 * Note: There is a known bug in Tru64 < 5.0 in which
                 *       the server reports NFS_DATA_SYNC, but performs
                 *       NFS_FILE_SYNC. We therefore implement this checking
                 *       as a dprintk() in order to avoid filling syslog.
                 */
		static unsigned long    complain;

		/* Note this will print the MDS for a DS write */
		if (time_before(complain, jiffies)) {
			dprintk("NFS:       faulty NFS server %s:"
				" (committed = %d) != (stable = %d)\n",
				NFS_SERVER(inode)->nfs_client->cl_hostname,
				hdr->res.verf->committed, hdr->args.stable);
			complain = jiffies + 300 * HZ;
		}
	}

	/* Deal with the suid/sgid bit corner case */
	if (nfs_should_remove_suid(inode))
		nfs_mark_for_revalidate(inode);
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Trond Myklebust
100
64.10%
5
33.33%
Anna Schumaker
22
14.10%
1
6.67%
Chuck Lever
12
7.69%
3
20.00%
Weston Andros Adamson
8
5.13%
1
6.67%
Fred Isaman
7
4.49%
3
20.00%
Rakib Mullick
4
2.56%
1
6.67%
David Howells
3
1.92%
1
6.67%
Total
156
100.00%
15
100.00%

/*
 * This function is called when the WRITE call is complete.
 */


static void nfs_writeback_result(struct rpc_task *task,
				 struct nfs_pgio_header *hdr)
{
	struct nfs_pgio_args	*argp = &hdr->args;
	struct nfs_pgio_res	*resp = &hdr->res;

	if (resp->count < argp->count) {
		static unsigned long    complain;

		/* This a short write! */
		nfs_inc_stats(hdr->inode, NFSIOS_SHORTWRITE);

		/* Has the server at least made some progress? */
		if (resp->count == 0) {
			if (time_before(complain, jiffies)) {
				printk(KERN_WARNING
				       "NFS: Server wrote zero bytes, expected %u.\n",
				       argp->count);
				complain = jiffies + 300 * HZ;
			}
			nfs_set_pgio_error(hdr, -EIO, argp->offset);
			task->tk_status = -EIO;
			return;
		}

		/* For non rpc-based layout drivers, retry-through-MDS */
		if (!task->tk_ops) {
			hdr->pnfs_error = -EAGAIN;
			return;
		}

		/* Was this an NFSv2 write or an NFSv3 stable write? */
		if (resp->verf->committed != NFS_UNSTABLE) {
			/* Resend from where the server left off */
			hdr->mds_offset += resp->count;
			argp->offset += resp->count;
			argp->pgbase += resp->count;
			argp->count -= resp->count;
		} else {
			/* Resend as a stable write in order to avoid
                         * headaches in the case of a server crash.
                         */
			argp->stable = NFS_FILE_SYNC;
		}
		rpc_restart_call_prepare(task);
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Trond Myklebust
74
36.63%
3
30.00%
Fred Isaman
64
31.68%
2
20.00%
Anna Schumaker
29
14.36%
1
10.00%
Kinglong Mee
18
8.91%
1
10.00%
Chuck Lever
7
3.47%
1
10.00%
Weston Andros Adamson
7
3.47%
1
10.00%
Linus Torvalds (pre-git)
3
1.49%
1
10.00%
Total
202
100.00%
10
100.00%



static int wait_on_commit(struct nfs_mds_commit_info *cinfo)
{
	return wait_on_atomic_t(&cinfo->rpcs_out,
			nfs_wait_atomic_killable, TASK_KILLABLE);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Trond Myklebust
24
100.00%
2
100.00%
Total
24
100.00%
2
100.00%



static void nfs_commit_begin(struct nfs_mds_commit_info *cinfo)
{
	atomic_inc(&cinfo->rpcs_out);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Trond Myklebust
18
94.74%
2
66.67%
Fred Isaman
1
5.26%
1
33.33%
Total
19
100.00%
3
100.00%



static void nfs_commit_end(struct nfs_mds_commit_info *cinfo)
{
	if (atomic_dec_and_test(&cinfo->rpcs_out))
		wake_up_atomic_t(&cinfo->rpcs_out);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Trond Myklebust
29
100.00%
2
100.00%
Total
29
100.00%
2
100.00%



void nfs_commitdata_release(struct nfs_commit_data *data)
{
	put_nfs_open_context(data->context);
	nfs_commit_free(data);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Trond Myklebust
18
81.82%
3
75.00%
Fred Isaman
4
18.18%
1
25.00%
Total
22
100.00%
4
100.00%


EXPORT_SYMBOL_GPL(nfs_commitdata_release);



int nfs_initiate_commit(struct rpc_clnt *clnt, struct nfs_commit_data *data,
			const struct nfs_rpc_ops *nfs_ops,
			const struct rpc_call_ops *call_ops,
			int how, int flags)
{
	struct rpc_task *task;
	int priority = flush_task_priority(how);
	struct rpc_message msg = {
		.rpc_argp = &data->args,
		.rpc_resp = &data->res,
		.rpc_cred = data->cred,
        };
	struct rpc_task_setup task_setup_data = {
		.task = &data->task,
		.rpc_client = clnt,
		.rpc_message = &msg,
		.callback_ops = call_ops,
		.callback_data = data,
		.workqueue = nfsiod_workqueue,
		.flags = RPC_TASK_ASYNC | flags,
		.priority = priority,
        };
	/* Set up the initial task struct.  */
	nfs_ops->commit_setup(data, &msg);

	dprintk("NFS: initiated commit call\n");

	nfs4_state_protect(NFS_SERVER(data->inode)->nfs_client,
		NFS_SP4_MACH_CRED_COMMIT, &task_setup_data.rpc_client, &msg);

	task = rpc_run_task(&task_setup_data);
	if (IS_ERR(task))
		return PTR_ERR(task);
	if (how & FLUSH_SYNC)
		rpc_wait_for_completion_task(task);
	rpc_put_task(task);
	return 0;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Trond Myklebust
88
42.93%
9
56.25%
Fred Isaman
71
34.63%
2
12.50%
Weston Andros Adamson
22
10.73%
1
6.25%
Linus Torvalds (pre-git)
11
5.37%
1
6.25%
Peng Tao
7
3.41%
1
6.25%
Andy Adamson
5
2.44%
1
6.25%
Kinglong Mee
1
0.49%
1
6.25%
Total
205
100.00%
16
100.00%


EXPORT_SYMBOL_GPL(nfs_initiate_commit);



static loff_t nfs_get_lwb(struct list_head *head)
{
	loff_t lwb = 0;
	struct nfs_page *req;

	list_for_each_entry(req, head, wb_list)
		if (lwb < (req_offset(req) + req->wb_bytes))
			lwb = req_offset(req) + req->wb_bytes;

	return lwb;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Peng Tao
58
100.00%
1
100.00%
Total
58
100.00%
1
100.00%

/*
 * Set up the argument/result storage required for the RPC call.
 */


void nfs_init_commit(struct nfs_commit_data *data,
		     struct list_head *head,
		     struct pnfs_layout_segment *lseg,
		     struct nfs_commit_info *cinfo)
{
	struct nfs_page *first = nfs_list_entry(head->next);
	struct inode *inode = d_inode(first->wb_context->dentry);

	/* Set up the RPC argument and reply structs
         * NB: take care not to mess about with data->commit et al. */

	list_splice_init(head, &data->pages);

	data->inode	  = inode;
	data->cred	  = first->wb_context->cred;
	data->lseg	  = lseg; /* reference transferred */
	/* only set lwb for pnfs commit */
	if (lseg)
		data->lwb = nfs_get_lwb(&data->pages);
	data->mds_ops     = &nfs_commit_ops;
	data->completion_ops = cinfo->completion_ops;
	data->dreq	  = cinfo->dreq;

	data->args.fh     = NFS_FH(data->inode);
	/* Note: we always request a commit of the entire inode */
	data->args.offset = 0;
	data->args.count  = 0;
	data->context     = get_nfs_open_context(first->wb_context);
	data->res.fattr   = &data->fattr;
	data->res.verf    = &data->verf;
	nfs_fattr_init(&data->fattr);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Fred Isaman
82
41.84%
5
33.33%
Trond Myklebust
71
36.22%
4
26.67%
Linus Torvalds (pre-git)
22
11.22%
3
20.00%
Peng Tao
17
8.67%
1
6.67%
David Howells
3
1.53%
1
6.67%
Andrew Morton
1
0.51%
1
6.67%
Total
196
100.00%
15
100.00%


EXPORT_SYMBOL_GPL(nfs_init_commit);



void nfs_retry_commit(struct list_head *page_list,
		      struct pnfs_layout_segment *lseg,
		      struct nfs_commit_info *cinfo,
		      u32 ds_commit_idx)
{
	struct nfs_page *req;

	while (!list_empty(page_list)) {
		req = nfs_list_entry(page_list->next);
		nfs_list_remove_request(req);
		nfs_mark_request_commit(req, lseg, cinfo, ds_commit_idx);
		if (!cinfo->dreq)
			nfs_clear_page_commit(req->wb_page);
		nfs_unlock_and_release_request(req);
	}
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Fred Isaman
73
89.02%
4
50.00%
Weston Andros Adamson
5
6.10%
1
12.50%
Mel Gorman
2
2.44%
1
12.50%
Trond Myklebust
1
1.22%
1
12.50%
Tom Haynes
1
1.22%
1
12.50%
Total
82
100.00%
8
100.00%


EXPORT_SYMBOL_GPL(nfs_retry_commit);


static void

nfs_commit_resched_write(struct nfs_commit_info *cinfo,
		struct nfs_page *req)
{
	__set_page_dirty_nobuffers(req->wb_page);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Trond Myklebust
23
100.00%
1
100.00%
Total
23
100.00%
1
100.00%

/*
 * Commit dirty pages
 */

static int

nfs_commit_list(struct inode *inode, struct list_head *head, int how,
		struct nfs_commit_info *cinfo)
{
	struct nfs_commit_data	*data;

	/* another commit raced with us */
	if (list_empty(head))
		return 0;

	data = nfs_commitdata_alloc();

	if (!data)
		goto out_bad;

	/* Set up the argument struct */
	nfs_init_commit(data, head, NULL, cinfo);
	atomic_inc(&cinfo->mds->rpcs_out);
	return nfs_initiate_commit(NFS_CLIENT(inode), data, NFS_PROTO(inode),
				   data->mds_ops, how, 0);
 out_bad:
	nfs_retry_commit(head, NULL, cinfo, 0);
	return -ENOMEM;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
45
38.79%
1
5.88%
Fred Isaman
41
35.34%
7
41.18%
Weston Andros Adamson
13
11.21%
2
11.76%
Peng Tao
5
4.31%
1
5.88%
Chuck Lever
5
4.31%
1
5.88%
Trond Myklebust
5
4.31%
4
23.53%
Andy Adamson
2
1.72%
1
5.88%
Total
116
100.00%
17
100.00%



int nfs_commit_file(struct file *file, struct nfs_write_verifier *verf)
{
	struct inode *inode = file_inode(file);
	struct nfs_open_context *open;
	struct nfs_commit_info cinfo;
	struct nfs_page *req;
	int ret;

	open = get_nfs_open_context(nfs_file_open_context(file));
	req  = nfs_create_request(open, NULL, NULL, 0, i_size_read(inode));
	if (IS_ERR(req)) {
		ret = PTR_ERR(req);
		goto out_put;
	}

	nfs_init_cinfo_from_inode(&cinfo, inode);

	memcpy(&req->wb_verf, verf, sizeof(struct nfs_write_verifier));
	nfs_request_add_commit_list(req, &cinfo);
	ret = nfs_commit_inode(inode, FLUSH_SYNC);
	if (ret > 0)
		ret = 0;

	nfs_free_request(req);
out_put:
	put_nfs_open_context(open);
	return ret;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Anna Schumaker
148
95.48%
1
50.00%
Dan Carpenter
7
4.52%
1
50.00%
Total
155
100.00%
2
100.00%


EXPORT_SYMBOL_GPL(nfs_commit_file);

/*
 * COMMIT call returned
 */


static void nfs_commit_done(struct rpc_task *task, void *calldata)
{
	struct nfs_commit_data	*data = calldata;

        dprintk("NFS: %5u nfs_commit_done (status %d)\n",
                                task->tk_pid, task->tk_status);

	/* Call the NFS version-specific code */
	NFS_PROTO(data->inode)->commit_done(task, data);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
25
50.00%
1
14.29%
Trond Myklebust
23
46.00%
4
57.14%
Fred Isaman
1
2.00%
1
14.29%
Chuck Lever
1
2.00%
1
14.29%
Total
50
100.00%
7
100.00%



static void nfs_commit_release_pages(struct nfs_commit_data *data)
{
	struct nfs_page	*req;
	int status = data->task.tk_status;
	struct nfs_commit_info cinfo;
	struct nfs_server *nfss;

	while (!list_empty(&data->pages)) {
		req = nfs_list_entry(data->pages.next);
		nfs_list_remove_request(req);
		if (req->wb_page)
			nfs_clear_page_commit(req->wb_page);

		dprintk("NFS:       commit (%s/%llu %d@%lld)",
			req->wb_context->dentry->d_sb->s_id,
			(unsigned long long)NFS_FILEID(d_inode(req->wb_context->dentry)),
			req->wb_bytes,
			(long long)req_offset(req));
		if (status < 0) {
			nfs_context_set_write_error(req->wb_context, status);
			if (req->wb_page)
				nfs_inode_remove_request(req);
			dprintk_cont(", error = %d\n", status);
			goto next;
		}

		/* Okay, COMMIT succeeded, apparently. Check the verifier
                 * returned by the server against all stored verfs. */
		if (!nfs_write_verifier_cmp(&req->wb_verf, &data->verf.verifier)) {
			/* We have a match */
			if (req->wb_page)
				nfs_inode_remove_request(req);
			dprintk_cont(" OK\n");
			goto next;
		}
		/* We have a mismatch. Write the page again */
		dprintk_cont(" mismatch\n");
		nfs_mark_request_dirty(req);
		set_bit(NFS_CONTEXT_RESEND_WRITES, &req->wb_context->flags);
	next:
		nfs_unlock_and_release_request(req);
	}
	nfss = NFS_SERVER(data->inode);
	if (atomic_long_read(&nfss->writeback) < NFS_CONGESTION_OFF_THRESH)
		clear_bdi_congested(&nfss->backing_dev_info, BLK_RW_ASYNC);

	nfs_init_cinfo(&cinfo, data->inode, data->dreq);
	nfs_commit_end(cinfo.mds);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
124
43.97%
3
10.00%
Trond Myklebust
53
18.79%
9
30.00%
Neil Brown
36
12.77%
1
3.33%
Fred Isaman
34
12.06%
6
20.00%
Kinglong Mee
12
4.26%
1
3.33%
Anna Schumaker
6
2.13%
1
3.33%
David Howells
3
1.06%
1
3.33%
Linus Torvalds
3
1.06%
2
6.67%
Chuck Lever
3
1.06%
2
6.67%
Joe Perches
3
1.06%
1
3.33%
Niels de Vos
2
0.71%
1
3.33%
Peter Zijlstra
2
0.71%
1
3.33%
Al Viro
1
0.35%
1
3.33%
Total
282
100.00%
30
100.00%



static void nfs_commit_release(void *calldata)
{
	struct nfs_commit_data *data = calldata;

	data->completion_ops->completion(data);
	nfs_commitdata_release(calldata);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Fred Isaman
21
67.74%
3
50.00%
Trond Myklebust
9
29.03%
2
33.33%
Linus Torvalds (pre-git)
1
3.23%
1
16.67%
Total
31
100.00%
6
100.00%


static const struct rpc_call_ops nfs_commit_ops = {
	.rpc_call_prepare = nfs_commit_prepare,
	.rpc_call_done = nfs_commit_done,
	.rpc_release = nfs_commit_release,
};


static const struct nfs_commit_completion_ops nfs_commit_completion_ops = {
	.completion = nfs_commit_release_pages,
	.resched_write = nfs_commit_resched_write,
};



int nfs_generic_commit_list(struct inode *inode, struct list_head *head,
			    int how, struct nfs_commit_info *cinfo)
{
	int status;

	status = pnfs_commit_list(inode, head, how, cinfo);
	if (status == PNFS_NOT_ATTEMPTED)
		status = nfs_commit_list(inode, head, how, cinfo);
	return status;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Fred Isaman
61
100.00%
2
100.00%
Total
61
100.00%
2
100.00%



int nfs_commit_inode(struct inode *inode, int how)
{
	LIST_HEAD(head);
	struct nfs_commit_info cinfo;
	int may_wait = how & FLUSH_SYNC;
	int error = 0;
	int res;

	nfs_init_cinfo_from_inode(&cinfo, inode);
	nfs_commit_begin(cinfo.mds);
	res = nfs_scan_commit(inode, &head, &cinfo);
	if (res)
		error = nfs_generic_commit_list(inode, &head, how, &cinfo);
	nfs_commit_end(cinfo.mds);
	if (error < 0)
		goto out_error;
	if (!may_wait)
		goto out_mark_dirty;
	error = wait_on_commit(cinfo.mds);
	if (error < 0)
		return error;
	return res;
out_error:
	res = error;
	/* Note: If we exit without ensuring that the commit is complete,
         * we must mark the inode as dirty. Otherwise, future calls to
         * sync_inode() with the WB_SYNC_ALL flag set will fail to ensure
         * that the data is on the disk.
         */
out_mark_dirty:
	__mark_inode_dirty(inode, I_DIRTY_DATASYNC);
	return res;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Trond Myklebust
88
59.46%
7
53.85%
Linus Torvalds (pre-git)
37
25.00%
2
15.38%
Fred Isaman
22
14.86%
3
23.08%
Linus Torvalds
1
0.68%
1
7.69%
Total
148
100.00%
13
100.00%


EXPORT_SYMBOL_GPL(nfs_commit_inode);



int nfs_write_inode(struct inode *inode, struct writeback_control *wbc)
{
	struct nfs_inode *nfsi = NFS_I(inode);
	int flags = FLUSH_SYNC;
	int ret = 0;

	/* no commits means nothing needs to be done */
	if (!nfsi->commit_info.ncommit)
		return ret;

	if (wbc->sync_mode == WB_SYNC_NONE) {
		/* Don't commit yet if this is a non-blocking flush and there
                 * are a lot of outstanding writes for this mapping.
                 */
		if (nfsi->commit_info.ncommit <= (nfsi->nrequests >> 1))
			goto out_mark_dirty;

		/* don't wait for the COMMIT response */
		flags = 0;
	}

	ret = nfs_commit_inode(inode, flags);
	if (ret >= 0) {
		if (wbc->sync_mode == WB_SYNC_NONE) {
			if (ret < wbc->nr_to_write)
				wbc->nr_to_write -= ret;
			else
				wbc->nr_to_write = 0;
		}
		return 0;
	}
out_mark_dirty:
	__mark_inode_dirty(inode, I_DIRTY_DATASYNC);
	return ret;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Trond Myklebust
122
83.56%
2
28.57%
Jeff Layton
18
12.33%
2
28.57%
Fred Isaman
4
2.74%
1
14.29%
Weston Andros Adamson
1
0.68%
1
14.29%
Anna Schumaker
1
0.68%
1
14.29%
Total
146
100.00%
7
100.00%


EXPORT_SYMBOL_GPL(nfs_write_inode);

/*
 * Wrapper for filemap_write_and_wait_range()
 *
 * Needed for pNFS in order to ensure data becomes visible to the
 * client.
 */


int nfs_filemap_write_and_wait_range(struct address_space *mapping,
		loff_t lstart, loff_t lend)
{
	int ret;

	ret = filemap_write_and_wait_range(mapping, lstart, lend);
	if (ret == 0)
		ret = pnfs_sync_inode(mapping->host, true);
	return ret;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Trond Myklebust
50
100.00%
1
100.00%
Total
50
100.00%
1
100.00%


EXPORT_SYMBOL_GPL(nfs_filemap_write_and_wait_range);

/*
 * flush the inode to disk.
 */


int nfs_wb_all(struct inode *inode)
{
	int ret;

	trace_nfs_writeback_inode_enter(inode);

	ret = filemap_write_and_wait(inode->i_mapping);
	if (ret)
		goto out;
	ret = nfs_commit_inode(inode, FLUSH_SYNC);
	if (ret < 0)
		goto out;
	pnfs_sync_inode(inode, true);
	ret = 0;

out:
	trace_nfs_writeback_inode_exit(inode, ret);
	return ret;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Trond Myklebust
58
77.33%
3
60.00%
Chuck Lever
14
18.67%
1
20.00%
Linus Torvalds (pre-git)
3
4.00%
1
20.00%
Total
75
100.00%
5
100.00%


EXPORT_SYMBOL_GPL(nfs_wb_all);



int nfs_wb_page_cancel(struct inode *inode, struct page *page)
{
	struct nfs_page *req;
	int ret = 0;

	wait_on_page_writeback(page);

	/* blocking call to cancel all requests and join to a single (head)
         * request */
	req = nfs_lock_and_join_requests(page, false);

	if (IS_ERR(req)) {
		ret = PTR_ERR(req);
	} else if (req) {
		/* all requests from this page have been cancelled by
                 * nfs_lock_and_join_requests, so just remove the head
                 * request from the inode / page_private pointer and
                 * release it */
		nfs_inode_remove_request(req);
		nfs_unlock_and_release_request(req);
	}

	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Trond Myklebust
61
79.22%
7
87.50%
Weston Andros Adamson
16
20.78%
1
12.50%
Total
77
100.00%
8
100.00%

/*
 * Write back all requests on one page - we do this before reading it.
 */


int nfs_wb_single_page(struct inode *inode, struct page *page, bool launder)
{
	loff_t range_start = page_file_offset(page);
	loff_t range_end = range_start + (loff_t)(PAGE_SIZE - 1);
	struct writeback_control wbc = {
		.sync_mode = WB_SYNC_ALL,
		.nr_to_write = 0,
		.range_start = range_start,
		.range_end = range_end,
        };
	int ret;

	trace_nfs_writeback_page_enter(inode);

	for (;;) {
		wait_on_page_writeback(page);
		if (clear_page_dirty_for_io(page)) {
			ret = nfs_writepage_locked(page, &wbc, launder);
			if (ret < 0)
				goto out_error;
			continue;
		}
		ret = 0;
		if (!PagePrivate(page))
			break;
		ret = nfs_commit_inode(inode, FLUSH_SYNC);
		if (ret < 0)
			goto out_error;
	}
out_error:
	trace_nfs_writeback_page_exit(inode, ret);
	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Trond Myklebust
152
95.00%
7
70.00%
Peng Tao
6
3.75%
1
10.00%
Kirill A. Shutemov
1
0.62%
1
10.00%
Mel Gorman
1
0.62%
1
10.00%
Total
160
100.00%
10
100.00%

#ifdef CONFIG_MIGRATION


int nfs_migrate_page(struct address_space *mapping, struct page *newpage,
		struct page *page, enum migrate_mode mode)
{
	/*
         * If PagePrivate is set, then the page is currently associated with
         * an in-progress read or write request. Don't try to migrate it.
         *
         * FIXME: we could do this in principle, but we'll need a way to ensure
         *        that we can safely release the inode reference while holding
         *        the page lock.
         */
	if (PagePrivate(page))
		return -EBUSY;

	if (!nfs_fscache_release_page(page, GFP_KERNEL))
		return -EBUSY;

	return migrate_page(mapping, newpage, page, mode);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Trond Myklebust
36
58.06%
2
33.33%
Jeff Layton
12
19.35%
1
16.67%
David Howells
8
12.90%
1
16.67%
Mel Gorman
6
9.68%
2
33.33%
Total
62
100.00%
6
100.00%

#endif



int __init nfs_init_writepagecache(void)
{
	nfs_wdata_cachep = kmem_cache_create("nfs_write_data",
					     sizeof(struct nfs_pgio_header),
					     0, SLAB_HWCACHE_ALIGN,
					     NULL);
	if (nfs_wdata_cachep == NULL)
		return -ENOMEM;

	nfs_wdata_mempool = mempool_create_slab_pool(MIN_POOL_WRITE,
						     nfs_wdata_cachep);
	if (nfs_wdata_mempool == NULL)
		goto out_destroy_write_cache;

	nfs_cdata_cachep = kmem_cache_create("nfs_commit_data",
					     sizeof(struct nfs_commit_data),
					     0, SLAB_HWCACHE_ALIGN,
					     NULL);
	if (nfs_cdata_cachep == NULL)
		goto out_destroy_write_mempool;

	nfs_commit_mempool = mempool_create_slab_pool(MIN_POOL_COMMIT,
						      nfs_cdata_cachep);
	if (nfs_commit_mempool == NULL)
		goto out_destroy_commit_cache;

	/*
         * NFS congestion size, scale with available memory.
         *
         *  64MB:    8192k
         * 128MB:   11585k
         * 256MB:   16384k
         * 512MB:   23170k
         *   1GB:   32768k
         *   2GB:   46340k
         *   4GB:   65536k
         *   8GB:   92681k
         *  16GB:  131072k
         *
         * This allows larger machines to have larger/more transfers.
         * Limit the default to 256M
         */
	nfs_congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10);
	if (nfs_congestion_kb > 256*1024)
		nfs_congestion_kb = 256*1024;

	return 0;

out_destroy_commit_cache:
	kmem_cache_destroy(nfs_cdata_cachep);
out_destroy_write_mempool:
	mempool_destroy(nfs_wdata_mempool);
out_destroy_write_cache:
	kmem_cache_destroy(nfs_wdata_cachep);
	return -ENOMEM;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
37
22.98%
3
25.00%
Jeff Layton
34
21.12%
1
8.33%
Peter Zijlstra
32
19.88%
1
8.33%
Trond Myklebust
27
16.77%
1
8.33%
Fred Isaman
25
15.53%
1
8.33%
Matthew Dobson
2
1.24%
1
8.33%
Weston Andros Adamson
1
0.62%
1
8.33%
David Howells
1
0.62%
1
8.33%
Linus Torvalds
1
0.62%
1
8.33%
Yanchuan Nian
1
0.62%
1
8.33%
Total
161
100.00%
12
100.00%



void nfs_destroy_writepagecache(void)
{
	mempool_destroy(nfs_commit_mempool);
	kmem_cache_destroy(nfs_cdata_cachep);
	mempool_destroy(nfs_wdata_mempool);
	kmem_cache_destroy(nfs_wdata_cachep);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
11
40.74%
3
50.00%
Trond Myklebust
10
37.04%
1
16.67%
Jeff Layton
5
18.52%
1
16.67%
Linus Torvalds
1
3.70%
1
16.67%
Total
27
100.00%
6
100.00%


static const struct nfs_rw_ops nfs_rw_write_ops = {
	.rw_mode		= FMODE_WRITE,
	.rw_alloc_header	= nfs_writehdr_alloc,
	.rw_free_header		= nfs_writehdr_free,
	.rw_done		= nfs_writeback_done,
	.rw_result		= nfs_writeback_result,
	.rw_initiate		= nfs_initiate_write,
};
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Trond Myklebust
3683
43.42%
124
42.76%
Fred Isaman
1247
14.70%
25
8.62%
Weston Andros Adamson
1133
13.36%
22
7.59%
Linus Torvalds (pre-git)
716
8.44%
17
5.86%
Jeff Layton
307
3.62%
9
3.10%
Anna Schumaker
296
3.49%
9
3.10%
Peng Tao
191
2.25%
4
1.38%
Peter Zijlstra
148
1.74%
3
1.03%
Mel Gorman
119
1.40%
6
2.07%
Scott Mayhew
110
1.30%
4
1.38%
Andy Adamson
91
1.07%
5
1.72%
Chuck Lever
70
0.83%
10
3.45%
Christoph Hellwig
55
0.65%
2
0.69%
Kinglong Mee
52
0.61%
4
1.38%
Linus Torvalds
50
0.59%
10
3.45%
Neil Brown
50
0.59%
2
0.69%
Bryan Schumaker
31
0.37%
4
1.38%
David Howells
24
0.28%
4
1.38%
Dave Wysochanski
23
0.27%
1
0.34%
Andrew Morton
13
0.15%
5
1.72%
Tom Haynes
11
0.13%
3
1.03%
Benjamin Coddington
10
0.12%
1
0.34%
Dave Chinner
10
0.12%
1
0.34%
Dan Carpenter
7
0.08%
1
0.34%
Tejun Heo
5
0.06%
1
0.34%
Rakib Mullick
4
0.05%
1
0.34%
Jens Axboe
4
0.05%
1
0.34%
Joe Perches
3
0.04%
1
0.34%
Nicholas Piggin
3
0.04%
1
0.34%
Paul Gortmaker
3
0.04%
1
0.34%
Christoph Lameter
2
0.02%
1
0.34%
Niels de Vos
2
0.02%
1
0.34%
Kirill A. Shutemov
2
0.02%
1
0.34%
Al Viro
2
0.02%
2
0.69%
Huang Ying
2
0.02%
1
0.34%
Matthew Dobson
2
0.02%
1
0.34%
Yanchuan Nian
1
0.01%
1
0.34%
Total
8482
100.00%
290
100.00%
Directory: fs/nfs

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