Release 4.11 fs/nfs/file.c

/*
 *  linux/fs/nfs/file.c
 *
 *  Copyright (C) 1992  Rick Sladkey
 *
 *  Changes Copyright (C) 1994 by Florian La Roche
 *   - Do not copy data too often around in the kernel.
 *   - In nfs_file_read the return value of kmalloc wasn't checked.
 *   - Put in a better version of read look-ahead buffering. Original idea
 *     and implementation by Wai S Kok elekokws@ee.nus.sg.
 *
 *  Expire cache on write to a file by Wai S Kok (Oct 1994).
 *
 *  Total rewrite of read side for new NFS buffer cache.. Linus.
 *
 *  nfs regular file handling functions
 */

#include <linux/module.h>
#include <linux/time.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/fcntl.h>
#include <linux/stat.h>
#include <linux/nfs_fs.h>
#include <linux/nfs_mount.h>
#include <linux/mm.h>
#include <linux/pagemap.h>
#include <linux/gfp.h>
#include <linux/swap.h>

#include <linux/uaccess.h>

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

#include "nfstrace.h"


#define NFSDBG_FACILITY		NFSDBG_FILE


static const struct vm_operations_struct nfs_file_vm_ops;

/* Hack for future NFS swap support */
#ifndef IS_SWAPFILE

# define IS_SWAPFILE(inode)	(0)
#endif



int nfs_check_flags(int flags)
{
	if ((flags & (O_APPEND | O_DIRECT)) == (O_APPEND | O_DIRECT))
		return -EINVAL;

	return 0;
}
Contributors
Person
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CommitProp
Andrew Morton
16
48.48%
1
33.33%
Matthew Wilcox
9
27.27%
1
33.33%
Linus Torvalds
8
24.24%
1
33.33%
Total
33
100.00%
3
100.00%


EXPORT_SYMBOL_GPL(nfs_check_flags);

/*
 * Open file
 */

static int

nfs_file_open(struct inode *inode, struct file *filp)
{
	int res;

	dprintk("NFS: open file(%pD2)\n", filp);

	nfs_inc_stats(inode, NFSIOS_VFSOPEN);
	res = nfs_check_flags(filp->f_flags);
	if (res)
		return res;

	res = nfs_open(inode, filp);
	return res;
}

Contributors
Person
Tokens
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Commits
CommitProp
Trond Myklebust
30
49.18%
3
30.00%
Chuck Lever
14
22.95%
4
40.00%
Matthew Wilcox
10
16.39%
1
10.00%
Andrew Morton
6
9.84%
1
10.00%
Al Viro
1
1.64%
1
10.00%
Total
61
100.00%
10
100.00%


int

nfs_file_release(struct inode *inode, struct file *filp)
{
	dprintk("NFS: release(%pD2)\n", filp);

	nfs_inc_stats(inode, NFSIOS_VFSRELEASE);
	nfs_file_clear_open_context(filp);
	return 0;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Trond Myklebust
19
51.35%
2
28.57%
Chuck Lever
12
32.43%
2
28.57%
Anna Schumaker
4
10.81%
1
14.29%
Al Viro
1
2.70%
1
14.29%
Rakib Mullick
1
2.70%
1
14.29%
Total
37
100.00%
7
100.00%


EXPORT_SYMBOL_GPL(nfs_file_release);

/**
 * nfs_revalidate_size - Revalidate the file size
 * @inode - pointer to inode struct
 * @file - pointer to struct file
 *
 * Revalidates the file length. This is basically a wrapper around
 * nfs_revalidate_inode() that takes into account the fact that we may
 * have cached writes (in which case we don't care about the server's
 * idea of what the file length is), or O_DIRECT (in which case we
 * shouldn't trust the cache).
 */


static int nfs_revalidate_file_size(struct inode *inode, struct file *filp)
{
	struct nfs_server *server = NFS_SERVER(inode);

	if (filp->f_flags & O_DIRECT)
		goto force_reval;
	if (nfs_check_cache_invalid(inode, NFS_INO_REVAL_PAGECACHE))
		goto force_reval;
	return 0;
force_reval:
	return __nfs_revalidate_inode(server, inode);
}

Contributors
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Trond Myklebust
62
100.00%
4
100.00%
Total
62
100.00%
4
100.00%



loff_t nfs_file_llseek(struct file *filp, loff_t offset, int whence)
{
	dprintk("NFS: llseek file(%pD2, %lld, %d)\n",
			filp, offset, whence);

	/*
         * whence == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
         * the cached file length
         */
	if (whence != SEEK_SET && whence != SEEK_CUR) {
		struct inode *inode = filp->f_mapping->host;

		int retval = nfs_revalidate_file_size(inode, filp);
		if (retval < 0)
			return (loff_t)retval;
	}

	return generic_file_llseek(filp, offset, whence);
}
Contributors
Person
Tokens
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Commits
CommitProp
Trond Myklebust
61
73.49%
3
30.00%
Chuck Lever
9
10.84%
2
20.00%
Andrew Morton
6
7.23%
1
10.00%
Josef Bacik
4
4.82%
1
10.00%
Andi Kleen
2
2.41%
2
20.00%
Al Viro
1
1.20%
1
10.00%
Total
83
100.00%
10
100.00%


EXPORT_SYMBOL_GPL(nfs_file_llseek);

/*
 * Flush all dirty pages, and check for write errors.
 */

static int

nfs_file_flush(struct file *file, fl_owner_t id)
{
	struct inode	*inode = file_inode(file);

	dprintk("NFS: flush(%pD2)\n", file);

	nfs_inc_stats(inode, NFSIOS_VFSFLUSH);
	if ((file->f_mode & FMODE_WRITE) == 0)
		return 0;

	/* Flush writes to the server and return any errors */
	return vfs_fsync(file, 0);
}

Contributors
Person
Tokens
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Commits
CommitProp
Trond Myklebust
22
35.48%
5
35.71%
Linus Torvalds (pre-git)
19
30.65%
5
35.71%
Chuck Lever
12
19.35%
2
14.29%
Al Viro
6
9.68%
1
7.14%
Miklos Szeredi
3
4.84%
1
7.14%
Total
62
100.00%
14
100.00%


ssize_t

nfs_file_read(struct kiocb *iocb, struct iov_iter *to)
{
	struct inode *inode = file_inode(iocb->ki_filp);
	ssize_t result;

	if (iocb->ki_flags & IOCB_DIRECT)
		return nfs_file_direct_read(iocb, to);

	dprintk("NFS: read(%pD2, %zu@%lu)\n",
		iocb->ki_filp,
		iov_iter_count(to), (unsigned long) iocb->ki_pos);

	nfs_start_io_read(inode);
	result = nfs_revalidate_mapping(inode, iocb->ki_filp->f_mapping);
	if (!result) {
		result = generic_file_read_iter(iocb, to);
		if (result > 0)
			nfs_add_stats(inode, NFSIOS_NORMALREADBYTES, result);
	}
	nfs_end_io_read(inode);
	return result;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
52
41.60%
6
30.00%
Trond Myklebust
29
23.20%
4
20.00%
Al Viro
20
16.00%
5
25.00%
Chuck Lever
18
14.40%
2
10.00%
Benjamin LaHaise
3
2.40%
1
5.00%
Rakib Mullick
2
1.60%
1
5.00%
Badari Pulavarty
1
0.80%
1
5.00%
Total
125
100.00%
20
100.00%


EXPORT_SYMBOL_GPL(nfs_file_read);


int

nfs_file_mmap(struct file * file, struct vm_area_struct * vma)
{
	struct inode *inode = file_inode(file);
	int	status;

	dprintk("NFS: mmap(%pD2)\n", file);

	/* Note: generic_file_mmap() returns ENOSYS on nommu systems
         *       so we call that before revalidating the mapping
         */
	status = generic_file_mmap(file, vma);
	if (!status) {
		vma->vm_ops = &nfs_file_vm_ops;
		status = nfs_revalidate_mapping(inode, file->f_mapping);
	}
	return status;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
46
63.01%
6
54.55%
Trond Myklebust
20
27.40%
3
27.27%
Al Viro
6
8.22%
1
9.09%
Chuck Lever
1
1.37%
1
9.09%
Total
73
100.00%
11
100.00%


EXPORT_SYMBOL_GPL(nfs_file_mmap);

/*
 * Flush any dirty pages for this process, and check for write errors.
 * The return status from this call provides a reliable indication of
 * whether any write errors occurred for this process.
 *
 * Notice that it clears the NFS_CONTEXT_ERROR_WRITE before synching to
 * disk, but it retrieves and clears ctx->error after synching, despite
 * the two being set at the same time in nfs_context_set_write_error().
 * This is because the former is used to notify the _next_ call to
 * nfs_file_write() that a write error occurred, and hence cause it to
 * fall back to doing a synchronous write.
 */

static int

nfs_file_fsync_commit(struct file *file, loff_t start, loff_t end, int datasync)
{
	struct nfs_open_context *ctx = nfs_file_open_context(file);
	struct inode *inode = file_inode(file);
	int have_error, do_resend, status;
	int ret = 0;

	dprintk("NFS: fsync file(%pD2) datasync %d\n", file, datasync);

	nfs_inc_stats(inode, NFSIOS_VFSFSYNC);
	do_resend = test_and_clear_bit(NFS_CONTEXT_RESEND_WRITES, &ctx->flags);
	have_error = test_and_clear_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags);
	status = nfs_commit_inode(inode, FLUSH_SYNC);
	have_error |= test_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags);
	if (have_error) {
		ret = xchg(&ctx->error, 0);
		if (ret)
			goto out;
	}
	if (status < 0) {
		ret = status;
		goto out;
	}
	do_resend |= test_bit(NFS_CONTEXT_RESEND_WRITES, &ctx->flags);
	if (do_resend)
		ret = -EAGAIN;
out:
	return ret;
}

Contributors
Person
Tokens
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Commits
CommitProp
Trond Myklebust
123
68.72%
5
27.78%
Linus Torvalds (pre-git)
25
13.97%
4
22.22%
Chuck Lever
10
5.59%
3
16.67%
Al Viro
6
3.35%
1
5.56%
Josef Bacik
6
3.35%
1
5.56%
Bryan Schumaker
4
2.23%
1
5.56%
Junjiro R. Okajima
3
1.68%
1
5.56%
Andy Adamson
1
0.56%
1
5.56%
Christoph Hellwig
1
0.56%
1
5.56%
Total
179
100.00%
18
100.00%


int

nfs_file_fsync(struct file *file, loff_t start, loff_t end, int datasync)
{
	int ret;
	struct inode *inode = file_inode(file);

	trace_nfs_fsync_enter(inode);

	do {
		ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
		if (ret != 0)
			break;
		ret = nfs_file_fsync_commit(file, start, end, datasync);
		if (!ret)
			ret = pnfs_sync_inode(inode, !!datasync);
		/*
                 * If nfs_file_fsync_commit detected a server reboot, then
                 * resend all dirty pages that might have been covered by
                 * the NFS_CONTEXT_RESEND_WRITES flag
                 */
		start = 0;
		end = LLONG_MAX;
	} while (ret == -EAGAIN);

	trace_nfs_fsync_exit(inode, ret);
	return ret;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Bryan Schumaker
46
39.66%
1
9.09%
Trond Myklebust
41
35.34%
5
45.45%
Christoph Hellwig
16
13.79%
1
9.09%
Andy Adamson
8
6.90%
1
9.09%
Al Viro
3
2.59%
1
9.09%
Linus Torvalds (pre-git)
2
1.72%
2
18.18%
Total
116
100.00%
11
100.00%


EXPORT_SYMBOL_GPL(nfs_file_fsync);

/*
 * Decide whether a read/modify/write cycle may be more efficient
 * then a modify/write/read cycle when writing to a page in the
 * page cache.
 *
 * The modify/write/read cycle may occur if a page is read before
 * being completely filled by the writer.  In this situation, the
 * page must be completely written to stable storage on the server
 * before it can be refilled by reading in the page from the server.
 * This can lead to expensive, small, FILE_SYNC mode writes being
 * done.
 *
 * It may be more efficient to read the page first if the file is
 * open for reading in addition to writing, the page is not marked
 * as Uptodate, it is not dirty or waiting to be committed,
 * indicating that it was previously allocated and then modified,
 * that there were valid bytes of data in that range of the file,
 * and that the new data won't completely replace the old data in
 * that range of the file.
 */


static int nfs_want_read_modify_write(struct file *file, struct page *page,
			loff_t pos, unsigned len)
{
	unsigned int pglen = nfs_page_length(page);
	unsigned int offset = pos & (PAGE_SIZE - 1);
	unsigned int end = offset + len;

	if (pnfs_ld_read_whole_page(file->f_mapping->host)) {
		if (!PageUptodate(page))
			return 1;
		return 0;
	}

	if ((file->f_mode & FMODE_READ) &&	/* open for read? */
	    !PageUptodate(page) &&		/* Uptodate? */
	    !PagePrivate(page) &&		/* i/o request already? */
	    pglen &&				/* valid bytes of file? */
	    (end < pglen || offset))		/* replace all valid bytes? */
		return 1;
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Peter Staubach
93
76.86%
1
33.33%
Christoph Hellwig
27
22.31%
1
33.33%
Kirill A. Shutemov
1
0.83%
1
33.33%
Total
121
100.00%
3
100.00%

/*
 * This does the "real" work of the write. We must allocate and lock the
 * page to be sent back to the generic routine, which then copies the
 * data from user space.
 *
 * If the writer ends up delaying the write, the writer needs to
 * increment the page use counts until he is done with the page.
 */


static int nfs_write_begin(struct file *file, struct address_space *mapping,
			loff_t pos, unsigned len, unsigned flags,
			struct page **pagep, void **fsdata)
{
	int ret;
	pgoff_t index = pos >> PAGE_SHIFT;
	struct page *page;
	int once_thru = 0;

	dfprintk(PAGECACHE, "NFS: write_begin(%pD2(%lu), %u@%lld)\n",
		file, mapping->host->i_ino, len, (long long) pos);

start:
	page = grab_cache_page_write_begin(mapping, index, flags);
	if (!page)
		return -ENOMEM;
	*pagep = page;

	ret = nfs_flush_incompatible(file, page);
	if (ret) {
		unlock_page(page);
		put_page(page);
	} else if (!once_thru &&
		   nfs_want_read_modify_write(file, page, pos, len)) {
		once_thru = 1;
		ret = nfs_readpage(file, page);
		put_page(page);
		if (!ret)
			goto start;
	}
	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Nicholas Piggin
74
41.34%
2
25.00%
Peter Staubach
54
30.17%
1
12.50%
Linus Torvalds (pre-git)
25
13.97%
2
25.00%
Chuck Lever
22
12.29%
1
12.50%
Kirill A. Shutemov
3
1.68%
1
12.50%
Niels de Vos
1
0.56%
1
12.50%
Total
179
100.00%
8
100.00%



static int nfs_write_end(struct file *file, struct address_space *mapping,
			loff_t pos, unsigned len, unsigned copied,
			struct page *page, void *fsdata)
{
	unsigned offset = pos & (PAGE_SIZE - 1);
	struct nfs_open_context *ctx = nfs_file_open_context(file);
	int status;

	dfprintk(PAGECACHE, "NFS: write_end(%pD2(%lu), %u@%lld)\n",
		file, mapping->host->i_ino, len, (long long) pos);

	/*
         * Zero any uninitialised parts of the page, and then mark the page
         * as up to date if it turns out that we're extending the file.
         */
	if (!PageUptodate(page)) {
		unsigned pglen = nfs_page_length(page);
		unsigned end = offset + copied;

		if (pglen == 0) {
			zero_user_segments(page, 0, offset,
					end, PAGE_SIZE);
			SetPageUptodate(page);
		} else if (end >= pglen) {
			zero_user_segment(page, end, PAGE_SIZE);
			if (offset == 0)
				SetPageUptodate(page);
		} else
			zero_user_segment(page, pglen, PAGE_SIZE);
	}

	status = nfs_updatepage(file, page, offset, copied);

	unlock_page(page);
	put_page(page);

	if (status < 0)
		return status;
	NFS_I(mapping->host)->write_io += copied;

	if (nfs_ctx_key_to_expire(ctx, mapping->host)) {
		status = nfs_wb_all(mapping->host);
		if (status < 0)
			return status;
	}

	return copied;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Trond Myklebust
87
34.94%
1
8.33%
Andy Adamson
48
19.28%
2
16.67%
Nicholas Piggin
42
16.87%
1
8.33%
Linus Torvalds (pre-git)
33
13.25%
2
16.67%
Chuck Lever
28
11.24%
2
16.67%
Kirill A. Shutemov
5
2.01%
1
8.33%
Scott Mayhew
4
1.61%
1
8.33%
Niels de Vos
1
0.40%
1
8.33%
Al Viro
1
0.40%
1
8.33%
Total
249
100.00%
12
100.00%

/*
 * Partially or wholly invalidate a page
 * - Release the private state associated with a page if undergoing complete
 *   page invalidation
 * - Called if either PG_private or PG_fscache is set on the page
 * - Caller holds page lock
 */


static void nfs_invalidate_page(struct page *page, unsigned int offset,
				unsigned int length)
{
	dfprintk(PAGECACHE, "NFS: invalidate_page(%p, %u, %u)\n",
		 page, offset, length);

	if (offset != 0 || length < PAGE_SIZE)
		return;
	/* Cancel any unstarted writes on this page */
	nfs_wb_page_cancel(page_file_mapping(page)->host, page);

	nfs_fscache_invalidate_page(page, page->mapping->host);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Trond Myklebust
30
44.78%
5
45.45%
Lukas Czerner
11
16.42%
1
9.09%
David Howells
11
16.42%
1
9.09%
Chuck Lever
10
14.93%
1
9.09%
Mel Gorman
3
4.48%
1
9.09%
Kirill A. Shutemov
1
1.49%
1
9.09%
Neil Brown
1
1.49%
1
9.09%
Total
67
100.00%
11
100.00%

/*
 * Attempt to release the private state associated with a page
 * - Called if either PG_private or PG_fscache is set on the page
 * - Caller holds page lock
 * - Return true (may release page) or false (may not)
 */


static int nfs_release_page(struct page *page, gfp_t gfp)
{
	dfprintk(PAGECACHE, "NFS: release_page(%p)\n", page);

	/* If PagePrivate() is set, then the page is not freeable */
	if (PagePrivate(page))
		return 0;
	return nfs_fscache_release_page(page, gfp);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Trond Myklebust
18
42.86%
3
60.00%
David Howells
15
35.71%
1
20.00%
Chuck Lever
9
21.43%
1
20.00%
Total
42
100.00%
5
100.00%



static void nfs_check_dirty_writeback(struct page *page,
				bool *dirty, bool *writeback)
{
	struct nfs_inode *nfsi;
	struct address_space *mapping = page_file_mapping(page);

	if (!mapping || PageSwapCache(page))
		return;

	/*
         * Check if an unstable page is currently being committed and
         * if so, have the VM treat it as if the page is under writeback
         * so it will not block due to pages that will shortly be freeable.
         */
	nfsi = NFS_I(mapping->host);
	if (atomic_read(&nfsi->commit_info.rpcs_out)) {
		*writeback = true;
		return;
	}

	/*
         * If PagePrivate() is set, then the page is not freeable and as the
         * inode is not being committed, it's not going to be cleaned in the
         * near future so treat it as dirty
         */
	if (PagePrivate(page))
		*dirty = true;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Mel Gorman
84
95.45%
1
50.00%
Trond Myklebust
4
4.55%
1
50.00%
Total
88
100.00%
2
100.00%

/*
 * Attempt to clear the private state associated with a page when an error
 * occurs that requires the cached contents of an inode to be written back or
 * destroyed
 * - Called if either PG_private or fscache is set on the page
 * - Caller holds page lock
 * - Return 0 if successful, -error otherwise
 */


static int nfs_launder_page(struct page *page)
{
	struct inode *inode = page_file_mapping(page)->host;
	struct nfs_inode *nfsi = NFS_I(inode);

	dfprintk(PAGECACHE, "NFS: launder_page(%ld, %llu)\n",
		inode->i_ino, (long long)page_offset(page));

	nfs_fscache_wait_on_page_write(nfsi, page);
	return nfs_wb_launder_page(inode, page);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Chuck Lever
29
42.65%
1
14.29%
Trond Myklebust
18
26.47%
3
42.86%
David Howells
17
25.00%
1
14.29%
Mel Gorman
3
4.41%
1
14.29%
Peng Tao
1
1.47%
1
14.29%
Total
68
100.00%
7
100.00%



static int nfs_swap_activate(struct swap_info_struct *sis, struct file *file,
						sector_t *span)
{
	struct rpc_clnt *clnt = NFS_CLIENT(file->f_mapping->host);

	*span = sis->pages;

	return rpc_clnt_swap_activate(clnt);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Mel Gorman
30
63.83%
1
33.33%
Jeff Layton
17
36.17%
2
66.67%
Total
47
100.00%
3
100.00%



static void nfs_swap_deactivate(struct file *file)
{
	struct rpc_clnt *clnt = NFS_CLIENT(file->f_mapping->host);

	rpc_clnt_swap_deactivate(clnt);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Mel Gorman
21
70.00%
1
33.33%
Jeff Layton
9
30.00%
2
66.67%
Total
30
100.00%
3
100.00%


const struct address_space_operations nfs_file_aops = {
	.readpage = nfs_readpage,
	.readpages = nfs_readpages,
	.set_page_dirty = __set_page_dirty_nobuffers,
	.writepage = nfs_writepage,
	.writepages = nfs_writepages,
	.write_begin = nfs_write_begin,
	.write_end = nfs_write_end,
	.invalidatepage = nfs_invalidate_page,
	.releasepage = nfs_release_page,
	.direct_IO = nfs_direct_IO,
#ifdef CONFIG_MIGRATION
	.migratepage = nfs_migrate_page,
#endif
	.launder_page = nfs_launder_page,
	.is_dirty_writeback = nfs_check_dirty_writeback,
	.error_remove_page = generic_error_remove_page,
	.swap_activate = nfs_swap_activate,
	.swap_deactivate = nfs_swap_deactivate,
};

/*
 * Notification that a PTE pointing to an NFS page is about to be made
 * writable, implying that someone is about to modify the page through a
 * shared-writable mapping
 */


static int nfs_vm_page_mkwrite(struct vm_fault *vmf)
{
	struct page *page = vmf->page;
	struct file *filp = vmf->vma->vm_file;
	struct inode *inode = file_inode(filp);
	unsigned pagelen;
	int ret = VM_FAULT_NOPAGE;
	struct address_space *mapping;

	dfprintk(PAGECACHE, "NFS: vm_page_mkwrite(%pD2(%lu), offset %lld)\n",
		filp, filp->f_mapping->host->i_ino,
		(long long)page_offset(page));

	sb_start_pagefault(inode->i_sb);

	/* make sure the cache has finished storing the page */
	nfs_fscache_wait_on_page_write(NFS_I(inode), page);

	wait_on_bit_action(&NFS_I(inode)->flags, NFS_INO_INVALIDATING,
			nfs_wait_bit_killable, TASK_KILLABLE);

	lock_page(page);
	mapping = page_file_mapping(page);
	if (mapping != inode->i_mapping)
		goto out_unlock;

	wait_on_page_writeback(page);

	pagelen = nfs_page_length(page);
	if (pagelen == 0)
		goto out_unlock;

	ret = VM_FAULT_LOCKED;
	if (nfs_flush_incompatible(filp, page) == 0 &&
	    nfs_updatepage(filp, page, 0, pagelen) == 0)
		goto out;

	ret = VM_FAULT_SIGBUS;
out_unlock:
	unlock_page(page);
out:
	sb_end_pagefault(inode->i_sb);
	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Trond Myklebust
130
61.03%
7
46.67%
Nicholas Piggin
30
14.08%
2
13.33%
Chuck Lever
29
13.62%
1
6.67%
David Howells
10
4.69%
1
6.67%
Al Viro
8
3.76%
1
6.67%
Mel Gorman
3
1.41%
1
6.67%
Dave Jiang
2
0.94%
1
6.67%
Niels de Vos
1
0.47%
1
6.67%
Total
213
100.00%
15
100.00%


static const struct vm_operations_struct nfs_file_vm_ops = {
	.fault = filemap_fault,
	.map_pages = filemap_map_pages,
	.page_mkwrite = nfs_vm_page_mkwrite,
};



static int nfs_need_check_write(struct file *filp, struct inode *inode)
{
	struct nfs_open_context *ctx;

	ctx = nfs_file_open_context(filp);
	if (test_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags) ||
	    nfs_ctx_key_to_expire(ctx, inode))
		return 1;
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Trond Myklebust
46
86.79%
3
60.00%
Andy Adamson
5
9.43%
1
20.00%
Scott Mayhew
2
3.77%
1
20.00%
Total
53
100.00%
5
100.00%



ssize_t nfs_file_write(struct kiocb *iocb, struct iov_iter *from)
{
	struct file *file = iocb->ki_filp;
	struct inode *inode = file_inode(file);
	unsigned long written = 0;
	ssize_t result;

	result = nfs_key_timeout_notify(file, inode);
	if (result)
		return result;

	if (iocb->ki_flags & IOCB_DIRECT)
		return nfs_file_direct_write(iocb, from);

	dprintk("NFS: write(%pD2, %zu@%Ld)\n",
		file, iov_iter_count(from), (long long) iocb->ki_pos);

	if (IS_SWAPFILE(inode))
		goto out_swapfile;
	/*
         * O_APPEND implies that we must revalidate the file length.
         */
	if (iocb->ki_flags & IOCB_APPEND) {
		result = nfs_revalidate_file_size(inode, file);
		if (result)
			goto out;
	}

	nfs_start_io_write(inode);
	result = generic_write_checks(iocb, from);
	if (result > 0) {
		current->backing_dev_info = inode_to_bdi(inode);
		result = generic_perform_write(file, from, iocb->ki_pos);
		current->backing_dev_info = NULL;
	}
	nfs_end_io_write(inode);
	if (result <= 0)
		goto out;

	result = generic_write_sync(iocb, result);
	if (result < 0)
		goto out;
	written = result;
	iocb->ki_pos += written;

	/* Return error values */
	if (nfs_need_check_write(file, inode)) {
		int err = vfs_fsync(file, 0);
		if (err < 0)
			result = err;
	}
	nfs_add_stats(inode, NFSIOS_NORMALWRITTENBYTES, written);
out:
	return result;

out_swapfile:
	printk(KERN_INFO "NFS: attempt to write to active swap file!\n");
	return -EBUSY;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Trond Myklebust
130
46.10%
10
35.71%
Linus Torvalds (pre-git)
81
28.72%
8
28.57%
Al Viro
25
8.87%
5
17.86%
Chuck Lever
24
8.51%
2
7.14%
Andy Adamson
15
5.32%
1
3.57%
Benjamin LaHaise
5
1.77%
1
3.57%
Badari Pulavarty
2
0.71%
1
3.57%
Total
282
100.00%
28
100.00%


EXPORT_SYMBOL_GPL(nfs_file_write);


static int

do_getlk(struct file *filp, int cmd, struct file_lock *fl, int is_local)
{
	struct inode *inode = filp->f_mapping->host;
	int status = 0;
	unsigned int saved_type = fl->fl_type;

	/* Try local locking first */
	posix_test_lock(filp, fl);
	if (fl->fl_type != F_UNLCK) {
		/* found a conflict */
		goto out;
	}
	fl->fl_type = saved_type;

	if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
		goto out_noconflict;

	if (is_local)
		goto out_noconflict;

	status = NFS_PROTO(inode)->lock(filp, cmd, fl);
out:
	return status;
out_noconflict:
	fl->fl_type = F_UNLCK;
	goto out;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Trond Myklebust
96
73.85%
3
37.50%
Sergey Vlasov
14
10.77%
1
12.50%
J. Bruce Fields
9
6.92%
1
12.50%
Bryan Schumaker
6
4.62%
1
12.50%
Suresh Jayaraman
4
3.08%
1
12.50%
Andy Adamson
1
0.77%
1
12.50%
Total
130
100.00%
8
100.00%


static int

do_unlk(struct file *filp, int cmd, struct file_lock *fl, int is_local)
{
	struct inode *inode = filp->f_mapping->host;
	struct nfs_lock_context *l_ctx;
	int status;

	/*
         * Flush all pending writes before doing anything
         * with locks..
         */
	vfs_fsync(filp, 0);

	l_ctx = nfs_get_lock_context(nfs_file_open_context(filp));
	if (!IS_ERR(l_ctx)) {
		status = nfs_iocounter_wait(l_ctx);
		nfs_put_lock_context(l_ctx);
		if (status < 0)
			return status;
	}

	/* NOTE: special case
         *      If we're signalled while cleaning up locks on process exit, we
         *      still need to complete the unlock.
         */
	/*
         * Use local locking if mounted with "-onolock" or with appropriate
         * "-olocal_lock="
         */
	if (!is_local)
		status = NFS_PROTO(inode)->lock(filp, cmd, fl);
	else
		status = locks_lock_file_wait(filp, fl);
	return status;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Trond Myklebust
120
95.24%
4
66.67%
Suresh Jayaraman
5
3.97%
1
16.67%
Jeff Layton
1
0.79%
1
16.67%
Total
126
100.00%
6
100.00%


static int

do_setlk(struct file *filp, int cmd, struct file_lock *fl, int is_local)
{
	struct inode *inode = filp->f_mapping->host;
	int status;

	/*
         * Flush all pending writes before doing anything
         * with locks..
         */
	status = nfs_sync_mapping(filp->f_mapping);
	if (status != 0)
		goto out;

	/*
         * Use local locking if mounted with "-onolock" or with appropriate
         * "-olocal_lock="
         */
	if (!is_local)
		status = NFS_PROTO(inode)->lock(filp, cmd, fl);
	else
		status = locks_lock_file_wait(filp, fl);
	if (status < 0)
		goto out;

	/*
         * Revalidate the cache if the server has time stamps granular
         * enough to detect subsecond changes.  Otherwise, clear the
         * cache to prevent missing any changes.
         *
         * This makes locking act as a cache coherency point.
         */
	nfs_sync_mapping(filp->f_mapping);
	if (!NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
		nfs_zap_mapping(inode, filp->f_mapping);
out:
	return status;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Trond Myklebust
117
87.97%
6
60.00%
Bryan Schumaker
6
4.51%
1
10.00%
Suresh Jayaraman
5
3.76%
1
10.00%
Ricardo Labiaga
4
3.01%
1
10.00%
Jeff Layton
1
0.75%
1
10.00%
Total
133
100.00%
10
100.00%

/*
 * Lock a (portion of) a file
 */


int nfs_lock(struct file *filp, int cmd, struct file_lock *fl)
{
	struct inode *inode = filp->f_mapping->host;
	int ret = -ENOLCK;
	int is_local = 0;

	dprintk("NFS: lock(%pD2, t=%x, fl=%x, r=%lld:%lld)\n",
			filp, fl->fl_type, fl->fl_flags,
			(long long)fl->fl_start, (long long)fl->fl_end);

	nfs_inc_stats(inode, NFSIOS_VFSLOCK);

	/* No mandatory locks over NFS */
	if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK)
		goto out_err;

	if (NFS_SERVER(inode)->flags & NFS_MOUNT_LOCAL_FCNTL)
		is_local = 1;

	if (NFS_PROTO(inode)->lock_check_bounds != NULL) {
		ret = NFS_PROTO(inode)->lock_check_bounds(fl);
		if (ret < 0)
			goto out_err;
	}

	if (IS_GETLK(cmd))
		ret = do_getlk(filp, cmd, fl, is_local);
	else if (fl->fl_type == F_UNLCK)
		ret = do_unlk(filp, cmd, fl, is_local);
	else
		ret = do_setlk(filp, cmd, fl, is_local);
out_err:
	return ret;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Trond Myklebust
87
42.44%
4
20.00%
Linus Torvalds (pre-git)
68
33.17%
6
30.00%
Suresh Jayaraman
26
12.68%
1
5.00%
Chuck Lever
7
3.41%
2
10.00%
ASANO Masahiro
6
2.93%
1
5.00%
Andrew Morton
4
1.95%
2
10.00%
Pavel Emelyanov
3
1.46%
1
5.00%
Linus Torvalds
3
1.46%
2
10.00%
Al Viro
1
0.49%
1
5.00%
Total
205
100.00%
20
100.00%


EXPORT_SYMBOL_GPL(nfs_lock);

/*
 * Lock a (portion of) a file
 */


int nfs_flock(struct file *filp, int cmd, struct file_lock *fl)
{
	struct inode *inode = filp->f_mapping->host;
	int is_local = 0;

	dprintk("NFS: flock(%pD2, t=%x, fl=%x)\n",
			filp, fl->fl_type, fl->fl_flags);

	if (!(fl->fl_flags & FL_FLOCK))
		return -ENOLCK;

	/*
         * The NFSv4 protocol doesn't support LOCK_MAND, which is not part of
         * any standard. In principle we might be able to support LOCK_MAND
         * on NFSv2/3 since NLMv3/4 support DOS share modes, but for now the
         * NFS code is not set up for it.
         */
	if (fl->fl_type & LOCK_MAND)
		return -EINVAL;

	if (NFS_SERVER(inode)->flags & NFS_MOUNT_LOCAL_FLOCK)
		is_local = 1;

	/* We're simulating flock() locks using posix locks on the server */
	if (fl->fl_type == F_UNLCK)
		return do_unlk(filp, cmd, fl, is_local);
	return do_setlk(filp, cmd, fl, is_local);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Trond Myklebust
61
48.80%
3
27.27%
Suresh Jayaraman
35
28.00%
1
9.09%
Jeff Layton
13
10.40%
1
9.09%
Linus Torvalds (pre-git)
12
9.60%
3
27.27%
Andrew Morton
2
1.60%
1
9.09%
Al Viro
1
0.80%
1
9.09%
Linus Torvalds
1
0.80%
1
9.09%
Total
125
100.00%
11
100.00%


EXPORT_SYMBOL_GPL(nfs_flock);


const struct file_operations nfs_file_operations = {
	.llseek		= nfs_file_llseek,
	.read_iter	= nfs_file_read,
	.write_iter	= nfs_file_write,
	.mmap		= nfs_file_mmap,
	.open		= nfs_file_open,
	.flush		= nfs_file_flush,
	.release	= nfs_file_release,
	.fsync		= nfs_file_fsync,
	.lock		= nfs_lock,
	.flock		= nfs_flock,
	.splice_read	= generic_file_splice_read,
	.splice_write	= iter_file_splice_write,
	.check_flags	= nfs_check_flags,
	.setlease	= simple_nosetlease,
};

EXPORT_SYMBOL_GPL(nfs_file_operations);
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Trond Myklebust
1413
42.51%
64
35.56%
Linus Torvalds (pre-git)
425
12.79%
26
14.44%
Chuck Lever
248
7.46%
12
6.67%
Mel Gorman
159
4.78%
3
1.67%
Nicholas Piggin
151
4.54%
3
1.67%
Peter Staubach
148
4.45%
1
0.56%
Jeff Layton
115
3.46%
6
3.33%
Bryan Schumaker
110
3.31%
4
2.22%
Al Viro
84
2.53%
11
6.11%
Andy Adamson
78
2.35%
4
2.22%
Suresh Jayaraman
75
2.26%
1
0.56%
David Howells
60
1.81%
2
1.11%
Christoph Hellwig
53
1.59%
3
1.67%
Andrew Morton
34
1.02%
4
2.22%
Matthew Wilcox
19
0.57%
1
0.56%
Kirill A. Shutemov
15
0.45%
2
1.11%
Sergey Vlasov
14
0.42%
1
0.56%
Linus Torvalds
13
0.39%
4
2.22%
Lukas Czerner
11
0.33%
1
0.56%
Art Haas
10
0.30%
1
0.56%
Josef Bacik
10
0.30%
2
1.11%
J. Bruce Fields
9
0.27%
1
0.56%
Benjamin LaHaise
8
0.24%
1
0.56%
Andi Kleen
7
0.21%
3
1.67%
ASANO Masahiro
6
0.18%
1
0.56%
Scott Mayhew
6
0.18%
1
0.56%
Chao Yu
5
0.15%
1
0.56%
Ricardo Labiaga
4
0.12%
1
0.56%
Alexey Dobriyan
4
0.12%
2
1.11%
Anna Schumaker
4
0.12%
1
0.56%
Miklos Szeredi
3
0.09%
1
0.56%
Pavel Emelyanov
3
0.09%
1
0.56%
Niels de Vos
3
0.09%
1
0.56%
Badari Pulavarty
3
0.09%
1
0.56%
Junjiro R. Okajima
3
0.09%
1
0.56%
Rakib Mullick
3
0.09%
1
0.56%
Tejun Heo
2
0.06%
1
0.56%
Dave Jiang
2
0.06%
1
0.56%
Peng Tao
1
0.03%
1
0.56%
Lucas De Marchi
1
0.03%
1
0.56%
Neil Brown
1
0.03%
1
0.56%
Dave Jones
1
0.03%
1
0.56%
Total
3324
100.00%
180
100.00%
Directory: fs/nfs

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