/*
 *  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/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/aio.h>
#include <linux/gfp.h>
#include <linux/swap.h>

#include <asm/uaccess.h>

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

#define NFSDBG_FACILITY         NFSDBG_FILE

static const struct vm_operations_struct nfs_file_vm_ops;

const struct inode_operations nfs_file_inode_operations = {
        .permission     = nfs_permission,
        .getattr        = nfs_getattr,
        .setattr        = nfs_setattr,
};

#ifdef CONFIG_NFS_V3
const struct inode_operations nfs3_file_inode_operations = {
        .permission     = nfs_permission,
        .getattr        = nfs_getattr,
        .setattr        = nfs_setattr,
        .listxattr      = nfs3_listxattr,
        .getxattr       = nfs3_getxattr,
        .setxattr       = nfs3_setxattr,
        .removexattr    = nfs3_removexattr,
};
#endif  /* CONFIG_NFS_v3 */

/* Hack for future NFS swap support */
#ifndef IS_SWAPFILE
# define IS_SWAPFILE(inode)     (0)
#endif

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

        return 0;
}

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

        dprintk("NFS: open file(%s/%s)\n",
                        filp->f_path.dentry->d_parent->d_name.name,
                        filp->f_path.dentry->d_name.name);

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

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

static int
nfs_file_release(struct inode *inode, struct file *filp)
{
        dprintk("NFS: release(%s/%s)\n",
                        filp->f_path.dentry->d_parent->d_name.name,
                        filp->f_path.dentry->d_name.name);

        nfs_inc_stats(inode, NFSIOS_VFSRELEASE);
        return nfs_release(inode, filp);
}

/**
 * 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);
        struct nfs_inode *nfsi = NFS_I(inode);

        if (nfs_have_delegated_attributes(inode))
                goto out_noreval;

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

static loff_t nfs_file_llseek(struct file *filp, loff_t offset, int origin)
{
        dprintk("NFS: llseek file(%s/%s, %lld, %d)\n",
                        filp->f_path.dentry->d_parent->d_name.name,
                        filp->f_path.dentry->d_name.name,
                        offset, origin);

        /*
         * origin == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
         * the cached file length
         */
        if (origin != SEEK_SET && origin != 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, origin);
}

/*
 * Flush all dirty pages, and check for write errors.
 */
static int
nfs_file_flush(struct file *file, fl_owner_t id)
{
        struct dentry   *dentry = file->f_path.dentry;
        struct inode    *inode = dentry->d_inode;

        dprintk("NFS: flush(%s/%s)\n",
                        dentry->d_parent->d_name.name,
                        dentry->d_name.name);

        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);
}

static ssize_t
nfs_file_read(struct kiocb *iocb, const struct iovec *iov,
                unsigned long nr_segs, loff_t pos)
{
        struct dentry * dentry = iocb->ki_filp->f_path.dentry;
        struct inode * inode = dentry->d_inode;
        ssize_t result;

        if (iocb->ki_filp->f_flags & O_DIRECT)
                return nfs_file_direct_read(iocb, iov, nr_segs, pos);

        dprintk("NFS: read(%s/%s, %lu@%lu)\n",
                dentry->d_parent->d_name.name, dentry->d_name.name,
                (unsigned long) iov_length(iov, nr_segs), (unsigned long) pos);

        result = nfs_revalidate_mapping(inode, iocb->ki_filp->f_mapping);
        if (!result) {
                result = generic_file_aio_read(iocb, iov, nr_segs, pos);
                if (result > 0)
                        nfs_add_stats(inode, NFSIOS_NORMALREADBYTES, result);
        }
        return result;
}

static ssize_t
nfs_file_splice_read(struct file *filp, loff_t *ppos,
                     struct pipe_inode_info *pipe, size_t count,
                     unsigned int flags)
{
        struct dentry *dentry = filp->f_path.dentry;
        struct inode *inode = dentry->d_inode;
        ssize_t res;

        dprintk("NFS: splice_read(%s/%s, %lu@%Lu)\n",
                dentry->d_parent->d_name.name, dentry->d_name.name,
                (unsigned long) count, (unsigned long long) *ppos);

        res = nfs_revalidate_mapping(inode, filp->f_mapping);
        if (!res) {
                res = generic_file_splice_read(filp, ppos, pipe, count, flags);
                if (res > 0)
                        nfs_add_stats(inode, NFSIOS_NORMALREADBYTES, res);
        }
        return res;
}

static int
nfs_file_mmap(struct file * file, struct vm_area_struct * vma)
{
        struct dentry *dentry = file->f_path.dentry;
        struct inode *inode = dentry->d_inode;
        int     status;

        dprintk("NFS: mmap(%s/%s)\n",
                dentry->d_parent->d_name.name, dentry->d_name.name);

        /* 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;
}

/*
 * 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(struct file *file, loff_t start, loff_t end, int datasync)
{
        struct dentry *dentry = file->f_path.dentry;
        struct nfs_open_context *ctx = nfs_file_open_context(file);
        struct inode *inode = dentry->d_inode;
        int have_error, status;
        int ret = 0;

        dprintk("NFS: fsync file(%s/%s) datasync %d\n",
                        dentry->d_parent->d_name.name, dentry->d_name.name,
                        datasync);

        ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
        mutex_lock(&inode->i_mutex);

        nfs_inc_stats(inode, NFSIOS_VFSFSYNC);
        have_error = test_and_clear_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags);
        status = nfs_commit_inode(inode, FLUSH_SYNC);
        if (status >= 0 && ret < 0)
                status = ret;
        have_error |= test_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags);
        if (have_error)
                ret = xchg(&ctx->error, 0);
        if (!ret && status < 0)
                ret = status;
        if (!ret && !datasync)
                /* application has asked for meta-data sync */
                ret = pnfs_layoutcommit_inode(inode, true);
        mutex_unlock(&inode->i_mutex);
        return ret;
}

/*
 * 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_CACHE_SIZE - 1);
        unsigned int end = offset + len;

        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;
}

/*
 * 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_CACHE_SHIFT;
        struct page *page;
        int once_thru = 0;

        dfprintk(PAGECACHE, "NFS: write_begin(%s/%s(%ld), %u@%lld)\n",
                file->f_path.dentry->d_parent->d_name.name,
                file->f_path.dentry->d_name.name,
                mapping->host->i_ino, len, (long long) pos);

start:
        /*
         * Prevent starvation issues if someone is doing a consistency
         * sync-to-disk
         */
        ret = wait_on_bit(&NFS_I(mapping->host)->flags, NFS_INO_FLUSHING,
                        nfs_wait_bit_killable, TASK_KILLABLE);
        if (ret)
                return ret;

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

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_CACHE_SIZE - 1);
        int status;

        dfprintk(PAGECACHE, "NFS: write_end(%s/%s(%ld), %u@%lld)\n",
                file->f_path.dentry->d_parent->d_name.name,
                file->f_path.dentry->d_name.name,
                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 + len;

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

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

        unlock_page(page);
        page_cache_release(page);

        if (status < 0)
                return status;
        return copied;
}

/*
 * 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 long offset)
{
        dfprintk(PAGECACHE, "NFS: invalidate_page(%p, %lu)\n", page, offset);

        if (offset != 0)
                return;
        /* Cancel any unstarted writes on this page */
        nfs_wb_page_cancel(page->mapping->host, page);

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

/*
 * 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)
{
        struct address_space *mapping = page->mapping;

        dfprintk(PAGECACHE, "NFS: release_page(%p)\n", page);

        /* Only do I/O if gfp is a superset of GFP_KERNEL */
        if (mapping && (gfp & GFP_KERNEL) == GFP_KERNEL) {
                int how = FLUSH_SYNC;

                /* Don't let kswapd deadlock waiting for OOM RPC calls */
                if (current_is_kswapd())
                        how = 0;
                nfs_commit_inode(mapping->host, how);
        }
        /* If PagePrivate() is set, then the page is not freeable */
        if (PagePrivate(page))
                return 0;
        return nfs_fscache_release_page(page, gfp);
}

/*
 * 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->mapping->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_page(inode, page);
}

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,
        .migratepage = nfs_migrate_page,
        .launder_page = nfs_launder_page,
        .error_remove_page = generic_error_remove_page,
};

/*
 * 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_area_struct *vma, struct vm_fault *vmf)
{
        struct page *page = vmf->page;
        struct file *filp = vma->vm_file;
        struct dentry *dentry = filp->f_path.dentry;
        unsigned pagelen;
        int ret = VM_FAULT_NOPAGE;
        struct address_space *mapping;

        dfprintk(PAGECACHE, "NFS: vm_page_mkwrite(%s/%s(%ld), offset %lld)\n",
                dentry->d_parent->d_name.name, dentry->d_name.name,
                filp->f_mapping->host->i_ino,
                (long long)page_offset(page));

        /* make sure the cache has finished storing the page */
        nfs_fscache_wait_on_page_write(NFS_I(dentry->d_inode), page);

        lock_page(page);
        mapping = page->mapping;
        if (mapping != dentry->d_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:
        return ret;
}

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

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

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

static ssize_t nfs_file_write(struct kiocb *iocb, const struct iovec *iov,
                                unsigned long nr_segs, loff_t pos)
{
        struct dentry * dentry = iocb->ki_filp->f_path.dentry;
        struct inode * inode = dentry->d_inode;
        unsigned long written = 0;
        ssize_t result;
        size_t count = iov_length(iov, nr_segs);

        if (iocb->ki_filp->f_flags & O_DIRECT)
                return nfs_file_direct_write(iocb, iov, nr_segs, pos);

        dprintk("NFS: write(%s/%s, %lu@%Ld)\n",
                dentry->d_parent->d_name.name, dentry->d_name.name,
                (unsigned long) count, (long long) pos);

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

        result = count;
        if (!count)
                goto out;

        result = generic_file_aio_write(iocb, iov, nr_segs, pos);
        if (result > 0)
                written = result;

        /* Return error values for O_DSYNC and IS_SYNC() */
        if (result >= 0 && nfs_need_sync_write(iocb->ki_filp, inode)) {
                int err = vfs_fsync(iocb->ki_filp, 0);
                if (err < 0)
                        result = err;
        }
        if (result > 0)
                nfs_add_stats(inode, NFSIOS_NORMALWRITTENBYTES, written);
out:
        return result;

out_swapfile:
        printk(KERN_INFO "NFS: attempt to write to active swap file!\n");
        goto out;
}

static ssize_t nfs_file_splice_write(struct pipe_inode_info *pipe,
                                     struct file *filp, loff_t *ppos,
                                     size_t count, unsigned int flags)
{
        struct dentry *dentry = filp->f_path.dentry;
        struct inode *inode = dentry->d_inode;
        unsigned long written = 0;
        ssize_t ret;

        dprintk("NFS splice_write(%s/%s, %lu@%llu)\n",
                dentry->d_parent->d_name.name, dentry->d_name.name,
                (unsigned long) count, (unsigned long long) *ppos);

        /*
         * The combination of splice and an O_APPEND destination is disallowed.
         */

        ret = generic_file_splice_write(pipe, filp, ppos, count, flags);
        if (ret > 0)
                written = ret;

        if (ret >= 0 && nfs_need_sync_write(filp, inode)) {
                int err = vfs_fsync(filp, 0);
                if (err < 0)
                        ret = err;
        }
        if (ret > 0)
                nfs_add_stats(inode, NFSIOS_NORMALWRITTENBYTES, written);
        return ret;
}

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_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;
}

static int do_vfs_lock(struct file *file, struct file_lock *fl)
{
        int res = 0;
        switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
                case FL_POSIX:
                        res = posix_lock_file_wait(file, fl);
                        break;
                case FL_FLOCK:
                        res = flock_lock_file_wait(file, fl);
                        break;
                default:
                        BUG();
        }
        return res;
}

static int
do_unlk(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..
         */
        nfs_sync_mapping(filp->f_mapping);

        /* 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 = do_vfs_lock(filp, fl);
        return status;
}

static int
is_time_granular(struct timespec *ts) {
        return ((ts->tv_sec == 0) && (ts->tv_nsec <= 1000));
}

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 = do_vfs_lock(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_have_delegation(inode, FMODE_READ)) {
                if (is_time_granular(&NFS_SERVER(inode)->time_delta))
                        __nfs_revalidate_inode(NFS_SERVER(inode), inode);
                else
                        nfs_zap_caches(inode);
        }
out:
        return status;
}

/*
 * Lock a (portion of) a file
 */
static 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(%s/%s, t=%x, fl=%x, r=%lld:%lld)\n",
                        filp->f_path.dentry->d_parent->d_name.name,
                        filp->f_path.dentry->d_name.name,
                        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;
}

/*
 * Lock a (portion of) a file
 */
static 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(%s/%s, t=%x, fl=%x)\n",
                        filp->f_path.dentry->d_parent->d_name.name,
                        filp->f_path.dentry->d_name.name,
                        fl->fl_type, fl->fl_flags);

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

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

        /* We're simulating flock() locks using posix locks on the server */
        fl->fl_owner = (fl_owner_t)filp;
        fl->fl_start = 0;
        fl->fl_end = OFFSET_MAX;

        if (fl->fl_type == F_UNLCK)
                return do_unlk(filp, cmd, fl, is_local);
        return do_setlk(filp, cmd, fl, is_local);
}

/*
 * There is no protocol support for leases, so we have no way to implement
 * them correctly in the face of opens by other clients.
 */
static int nfs_setlease(struct file *file, long arg, struct file_lock **fl)
{
        dprintk("NFS: setlease(%s/%s, arg=%ld)\n",
                        file->f_path.dentry->d_parent->d_name.name,
                        file->f_path.dentry->d_name.name, arg);
        return -EINVAL;
}

const struct file_operations nfs_file_operations = {
        .llseek         = nfs_file_llseek,
        .read           = do_sync_read,
        .write          = do_sync_write,
        .aio_read       = nfs_file_read,
        .aio_write      = 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    = nfs_file_splice_read,
        .splice_write   = nfs_file_splice_write,
        .check_flags    = nfs_check_flags,
        .setlease       = nfs_setlease,
};

#ifdef CONFIG_NFS_V4
static int
nfs4_file_open(struct inode *inode, struct file *filp)
{
        /*
         * NFSv4 opens are handled in d_lookup and d_revalidate. If we get to
         * this point, then something is very wrong
         */
        dprintk("NFS: %s called! inode=%p filp=%p\n", __func__, inode, filp);
        return -ENOTDIR;
}

const struct file_operations nfs4_file_operations = {
        .llseek         = nfs_file_llseek,
        .read           = do_sync_read,
        .write          = do_sync_write,
        .aio_read       = nfs_file_read,
        .aio_write      = nfs_file_write,
        .mmap           = nfs_file_mmap,
        .open           = nfs4_file_open,
        .flush          = nfs_file_flush,
        .release        = nfs_file_release,
        .fsync          = nfs_file_fsync,
        .lock           = nfs_lock,
        .flock          = nfs_flock,
        .splice_read    = nfs_file_splice_read,
        .splice_write   = nfs_file_splice_write,
        .check_flags    = nfs_check_flags,
        .setlease       = nfs_setlease,
};
#endif /* CONFIG_NFS_V4 */