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Revert "Merge branch 'odirect'"

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This reverts ccf01ef7aa commit.

No idea how git managed this one: when I asked it to merge the odirect
topic branch it actually generated a patch which reverted the change.

Reverting the 'merge' will once again reveal Chuck's recent NFS/O_DIRECT
work to the world.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2006-06-28 16:52:45 -04:00
parent 79bc79b07c
commit 607f31e80b
2 changed files with 203 additions and 234 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

435
fs/nfs/direct.c
View File

@ -68,25 +68,19 @@ struct nfs_direct_req {
struct kref kref; /* release manager */
/* I/O parameters */
struct list_head list, /* nfs_read/write_data structs */
rewrite_list; /* saved nfs_write_data structs */
struct nfs_open_context *ctx; /* file open context info */
struct kiocb * iocb; /* controlling i/o request */
struct inode * inode; /* target file of i/o */
unsigned long user_addr; /* location of user's buffer */
size_t user_count; /* total bytes to move */
loff_t pos; /* starting offset in file */
struct page ** pages; /* pages in our buffer */
unsigned int npages; /* count of pages */
/* completion state */
atomic_t io_count; /* i/os we're waiting for */
spinlock_t lock; /* protect completion state */
int outstanding; /* i/os we're waiting for */
ssize_t count, /* bytes actually processed */
error; /* any reported error */
struct completion completion; /* wait for i/o completion */
/* commit state */
struct list_head rewrite_list; /* saved nfs_write_data structs */
struct nfs_write_data * commit_data; /* special write_data for commits */
int flags;
#define NFS_ODIRECT_DO_COMMIT (1) /* an unstable reply was received */
@ -94,8 +88,37 @@ struct nfs_direct_req {
struct nfs_writeverf verf; /* unstable write verifier */
};
static void nfs_direct_write_schedule(struct nfs_direct_req *dreq, int sync);
static void nfs_direct_write_complete(struct nfs_direct_req *dreq, struct inode *inode);
static const struct rpc_call_ops nfs_write_direct_ops;
static inline void get_dreq(struct nfs_direct_req *dreq)
{
atomic_inc(&dreq->io_count);
}
static inline int put_dreq(struct nfs_direct_req *dreq)
{
return atomic_dec_and_test(&dreq->io_count);
}
/*
* "size" is never larger than rsize or wsize.
*/
static inline int nfs_direct_count_pages(unsigned long user_addr, size_t size)
{
int page_count;
page_count = (user_addr + size + PAGE_SIZE - 1) >> PAGE_SHIFT;
page_count -= user_addr >> PAGE_SHIFT;
BUG_ON(page_count < 0);
return page_count;
}
static inline unsigned int nfs_max_pages(unsigned int size)
{
return (size + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
}
/**
* nfs_direct_IO - NFS address space operation for direct I/O
@ -119,50 +142,21 @@ ssize_t nfs_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov, loff_
return -EINVAL;
}
static void nfs_free_user_pages(struct page **pages, int npages, int do_dirty)
static void nfs_direct_dirty_pages(struct page **pages, int npages)
{
int i;
for (i = 0; i < npages; i++) {
struct page *page = pages[i];
if (do_dirty && !PageCompound(page))
if (!PageCompound(page))
set_page_dirty_lock(page);
page_cache_release(page);
}
kfree(pages);
}
static inline int nfs_get_user_pages(int rw, unsigned long user_addr, size_t size, struct page ***pages)
static void nfs_direct_release_pages(struct page **pages, int npages)
{
int result = -ENOMEM;
unsigned long page_count;
size_t array_size;
page_count = (user_addr + size + PAGE_SIZE - 1) >> PAGE_SHIFT;
page_count -= user_addr >> PAGE_SHIFT;
array_size = (page_count * sizeof(struct page *));
*pages = kmalloc(array_size, GFP_KERNEL);
if (*pages) {
down_read(&current->mm->mmap_sem);
result = get_user_pages(current, current->mm, user_addr,
page_count, (rw == READ), 0,
*pages, NULL);
up_read(&current->mm->mmap_sem);
if (result != page_count) {
/*
* If we got fewer pages than expected from
* get_user_pages(), the user buffer runs off the
* end of a mapping; return EFAULT.
*/
if (result >= 0) {
nfs_free_user_pages(*pages, result, 0);
result = -EFAULT;
} else
kfree(*pages);
*pages = NULL;
}
}
return result;
int i;
for (i = 0; i < npages; i++)
page_cache_release(pages[i]);
}
static inline struct nfs_direct_req *nfs_direct_req_alloc(void)
@ -174,13 +168,13 @@ static inline struct nfs_direct_req *nfs_direct_req_alloc(void)
return NULL;
kref_init(&dreq->kref);
kref_get(&dreq->kref);
init_completion(&dreq->completion);
INIT_LIST_HEAD(&dreq->list);
INIT_LIST_HEAD(&dreq->rewrite_list);
dreq->iocb = NULL;
dreq->ctx = NULL;
spin_lock_init(&dreq->lock);
dreq->outstanding = 0;
atomic_set(&dreq->io_count, 0);
dreq->count = 0;
dreq->error = 0;
dreq->flags = 0;
@ -221,18 +215,11 @@ out:
}
/*
* We must hold a reference to all the pages in this direct read request
* until the RPCs complete. This could be long *after* we are woken up in
* nfs_direct_wait (for instance, if someone hits ^C on a slow server).
*
* In addition, synchronous I/O uses a stack-allocated iocb. Thus we
* can't trust the iocb is still valid here if this is a synchronous
* request. If the waiter is woken prematurely, the iocb is long gone.
* Synchronous I/O uses a stack-allocated iocb. Thus we can't trust
* the iocb is still valid here if this is a synchronous request.
*/
static void nfs_direct_complete(struct nfs_direct_req *dreq)
{
nfs_free_user_pages(dreq->pages, dreq->npages, 1);
if (dreq->iocb) {
long res = (long) dreq->error;
if (!res)
@ -245,48 +232,10 @@ static void nfs_direct_complete(struct nfs_direct_req *dreq)
}
/*
* Note we also set the number of requests we have in the dreq when we are
* done. This prevents races with I/O completion so we will always wait
* until all requests have been dispatched and completed.
* We must hold a reference to all the pages in this direct read request
* until the RPCs complete. This could be long *after* we are woken up in
* nfs_direct_wait (for instance, if someone hits ^C on a slow server).
*/
static struct nfs_direct_req *nfs_direct_read_alloc(size_t nbytes, size_t rsize)
{
struct list_head *list;
struct nfs_direct_req *dreq;
unsigned int rpages = (rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
dreq = nfs_direct_req_alloc();
if (!dreq)
return NULL;
list = &dreq->list;
for(;;) {
struct nfs_read_data *data = nfs_readdata_alloc(rpages);
if (unlikely(!data)) {
while (!list_empty(list)) {
data = list_entry(list->next,
struct nfs_read_data, pages);
list_del(&data->pages);
nfs_readdata_free(data);
}
kref_put(&dreq->kref, nfs_direct_req_release);
return NULL;
}
INIT_LIST_HEAD(&data->pages);
list_add(&data->pages, list);
data->req = (struct nfs_page *) dreq;
dreq->outstanding++;
if (nbytes <= rsize)
break;
nbytes -= rsize;
}
kref_get(&dreq->kref);
return dreq;
}
static void nfs_direct_read_result(struct rpc_task *task, void *calldata)
{
struct nfs_read_data *data = calldata;
@ -295,6 +244,9 @@ static void nfs_direct_read_result(struct rpc_task *task, void *calldata)
if (nfs_readpage_result(task, data) != 0)
return;
nfs_direct_dirty_pages(data->pagevec, data->npages);
nfs_direct_release_pages(data->pagevec, data->npages);
spin_lock(&dreq->lock);
if (likely(task->tk_status >= 0))
@ -302,13 +254,10 @@ static void nfs_direct_read_result(struct rpc_task *task, void *calldata)
else
dreq->error = task->tk_status;
if (--dreq->outstanding) {
spin_unlock(&dreq->lock);
return;
}
spin_unlock(&dreq->lock);
nfs_direct_complete(dreq);
if (put_dreq(dreq))
nfs_direct_complete(dreq);
}
static const struct rpc_call_ops nfs_read_direct_ops = {
@ -317,41 +266,60 @@ static const struct rpc_call_ops nfs_read_direct_ops = {
};
/*
* For each nfs_read_data struct that was allocated on the list, dispatch
* an NFS READ operation
* For each rsize'd chunk of the user's buffer, dispatch an NFS READ
* operation. If nfs_readdata_alloc() or get_user_pages() fails,
* bail and stop sending more reads. Read length accounting is
* handled automatically by nfs_direct_read_result(). Otherwise, if
* no requests have been sent, just return an error.
*/
static void nfs_direct_read_schedule(struct nfs_direct_req *dreq)
static ssize_t nfs_direct_read_schedule(struct nfs_direct_req *dreq, unsigned long user_addr, size_t count, loff_t pos)
{
struct nfs_open_context *ctx = dreq->ctx;
struct inode *inode = ctx->dentry->d_inode;
struct list_head *list = &dreq->list;
struct page **pages = dreq->pages;
size_t count = dreq->user_count;
loff_t pos = dreq->pos;
size_t rsize = NFS_SERVER(inode)->rsize;
unsigned int curpage, pgbase;
unsigned int rpages = nfs_max_pages(rsize);
unsigned int pgbase;
int result;
ssize_t started = 0;
curpage = 0;
pgbase = dreq->user_addr & ~PAGE_MASK;
get_dreq(dreq);
pgbase = user_addr & ~PAGE_MASK;
do {
struct nfs_read_data *data;
size_t bytes;
result = -ENOMEM;
data = nfs_readdata_alloc(rpages);
if (unlikely(!data))
break;
bytes = rsize;
if (count < rsize)
bytes = count;
BUG_ON(list_empty(list));
data = list_entry(list->next, struct nfs_read_data, pages);
list_del_init(&data->pages);
data->npages = nfs_direct_count_pages(user_addr, bytes);
down_read(&current->mm->mmap_sem);
result = get_user_pages(current, current->mm, user_addr,
data->npages, 1, 0, data->pagevec, NULL);
up_read(&current->mm->mmap_sem);
if (unlikely(result < data->npages)) {
if (result > 0)
nfs_direct_release_pages(data->pagevec, result);
nfs_readdata_release(data);
break;
}
get_dreq(dreq);
data->req = (struct nfs_page *) dreq;
data->inode = inode;
data->cred = ctx->cred;
data->args.fh = NFS_FH(inode);
data->args.context = ctx;
data->args.offset = pos;
data->args.pgbase = pgbase;
data->args.pages = &pages[curpage];
data->args.pages = data->pagevec;
data->args.count = bytes;
data->res.fattr = &data->fattr;
data->res.eof = 0;
@ -374,33 +342,35 @@ static void nfs_direct_read_schedule(struct nfs_direct_req *dreq)
bytes,
(unsigned long long)data->args.offset);
started += bytes;
user_addr += bytes;
pos += bytes;
pgbase += bytes;
curpage += pgbase >> PAGE_SHIFT;
pgbase &= ~PAGE_MASK;
count -= bytes;
} while (count != 0);
BUG_ON(!list_empty(list));
if (put_dreq(dreq))
nfs_direct_complete(dreq);
if (started)
return 0;
return result < 0 ? (ssize_t) result : -EFAULT;
}
static ssize_t nfs_direct_read(struct kiocb *iocb, unsigned long user_addr, size_t count, loff_t pos, struct page **pages, unsigned int nr_pages)
static ssize_t nfs_direct_read(struct kiocb *iocb, unsigned long user_addr, size_t count, loff_t pos)
{
ssize_t result;
ssize_t result = 0;
sigset_t oldset;
struct inode *inode = iocb->ki_filp->f_mapping->host;
struct rpc_clnt *clnt = NFS_CLIENT(inode);
struct nfs_direct_req *dreq;
dreq = nfs_direct_read_alloc(count, NFS_SERVER(inode)->rsize);
dreq = nfs_direct_req_alloc();
if (!dreq)
return -ENOMEM;
dreq->user_addr = user_addr;
dreq->user_count = count;
dreq->pos = pos;
dreq->pages = pages;
dreq->npages = nr_pages;
dreq->inode = inode;
dreq->ctx = get_nfs_open_context((struct nfs_open_context *)iocb->ki_filp->private_data);
if (!is_sync_kiocb(iocb))
@ -408,8 +378,9 @@ static ssize_t nfs_direct_read(struct kiocb *iocb, unsigned long user_addr, size
nfs_add_stats(inode, NFSIOS_DIRECTREADBYTES, count);
rpc_clnt_sigmask(clnt, &oldset);
nfs_direct_read_schedule(dreq);
result = nfs_direct_wait(dreq);
result = nfs_direct_read_schedule(dreq, user_addr, count, pos);
if (!result)
result = nfs_direct_wait(dreq);
rpc_clnt_sigunmask(clnt, &oldset);
return result;
@ -417,10 +388,10 @@ static ssize_t nfs_direct_read(struct kiocb *iocb, unsigned long user_addr, size
static void nfs_direct_free_writedata(struct nfs_direct_req *dreq)
{
list_splice_init(&dreq->rewrite_list, &dreq->list);
while (!list_empty(&dreq->list)) {
struct nfs_write_data *data = list_entry(dreq->list.next, struct nfs_write_data, pages);
while (!list_empty(&dreq->rewrite_list)) {
struct nfs_write_data *data = list_entry(dreq->rewrite_list.next, struct nfs_write_data, pages);
list_del(&data->pages);
nfs_direct_release_pages(data->pagevec, data->npages);
nfs_writedata_release(data);
}
}
@ -428,14 +399,51 @@ static void nfs_direct_free_writedata(struct nfs_direct_req *dreq)
#if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
static void nfs_direct_write_reschedule(struct nfs_direct_req *dreq)
{
struct list_head *pos;
struct inode *inode = dreq->inode;
struct list_head *p;
struct nfs_write_data *data;
list_splice_init(&dreq->rewrite_list, &dreq->list);
list_for_each(pos, &dreq->list)
dreq->outstanding++;
dreq->count = 0;
get_dreq(dreq);
nfs_direct_write_schedule(dreq, FLUSH_STABLE);
list_for_each(p, &dreq->rewrite_list) {
data = list_entry(p, struct nfs_write_data, pages);
get_dreq(dreq);
/*
* Reset data->res.
*/
nfs_fattr_init(&data->fattr);
data->res.count = data->args.count;
memset(&data->verf, 0, sizeof(data->verf));
/*
* Reuse data->task; data->args should not have changed
* since the original request was sent.
*/
rpc_init_task(&data->task, NFS_CLIENT(inode), RPC_TASK_ASYNC,
&nfs_write_direct_ops, data);
NFS_PROTO(inode)->write_setup(data, FLUSH_STABLE);
data->task.tk_priority = RPC_PRIORITY_NORMAL;
data->task.tk_cookie = (unsigned long) inode;
/*
* We're called via an RPC callback, so BKL is already held.
*/
rpc_execute(&data->task);
dprintk("NFS: %5u rescheduled direct write call (req %s/%Ld, %u bytes @ offset %Lu)\n",
data->task.tk_pid,
inode->i_sb->s_id,
(long long)NFS_FILEID(inode),
data->args.count,
(unsigned long long)data->args.offset);
}
if (put_dreq(dreq))
nfs_direct_write_complete(dreq, inode);
}
static void nfs_direct_commit_result(struct rpc_task *task, void *calldata)
@ -472,8 +480,8 @@ static void nfs_direct_commit_schedule(struct nfs_direct_req *dreq)
data->cred = dreq->ctx->cred;
data->args.fh = NFS_FH(data->inode);
data->args.offset = dreq->pos;
data->args.count = dreq->user_count;
data->args.offset = 0;
data->args.count = 0;
data->res.count = 0;
data->res.fattr = &data->fattr;
data->res.verf = &data->verf;
@ -535,47 +543,6 @@ static void nfs_direct_write_complete(struct nfs_direct_req *dreq, struct inode
}
#endif
static struct nfs_direct_req *nfs_direct_write_alloc(size_t nbytes, size_t wsize)
{
struct list_head *list;
struct nfs_direct_req *dreq;
unsigned int wpages = (wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
dreq = nfs_direct_req_alloc();
if (!dreq)
return NULL;
list = &dreq->list;
for(;;) {
struct nfs_write_data *data = nfs_writedata_alloc(wpages);
if (unlikely(!data)) {
while (!list_empty(list)) {
data = list_entry(list->next,
struct nfs_write_data, pages);
list_del(&data->pages);
nfs_writedata_free(data);
}
kref_put(&dreq->kref, nfs_direct_req_release);
return NULL;
}
INIT_LIST_HEAD(&data->pages);
list_add(&data->pages, list);
data->req = (struct nfs_page *) dreq;
dreq->outstanding++;
if (nbytes <= wsize)
break;
nbytes -= wsize;
}
nfs_alloc_commit_data(dreq);
kref_get(&dreq->kref);
return dreq;
}
static void nfs_direct_write_result(struct rpc_task *task, void *calldata)
{
struct nfs_write_data *data = calldata;
@ -605,8 +572,6 @@ static void nfs_direct_write_result(struct rpc_task *task, void *calldata)
}
}
}
/* In case we have to resend */
data->args.stable = NFS_FILE_SYNC;
spin_unlock(&dreq->lock);
}
@ -620,14 +585,8 @@ static void nfs_direct_write_release(void *calldata)
struct nfs_write_data *data = calldata;
struct nfs_direct_req *dreq = (struct nfs_direct_req *) data->req;
spin_lock(&dreq->lock);
if (--dreq->outstanding) {
spin_unlock(&dreq->lock);
return;
}
spin_unlock(&dreq->lock);
nfs_direct_write_complete(dreq, data->inode);
if (put_dreq(dreq))
nfs_direct_write_complete(dreq, data->inode);
}
static const struct rpc_call_ops nfs_write_direct_ops = {
@ -636,41 +595,62 @@ static const struct rpc_call_ops nfs_write_direct_ops = {
};
/*
* For each nfs_write_data struct that was allocated on the list, dispatch
* an NFS WRITE operation
* For each wsize'd chunk of the user's buffer, dispatch an NFS WRITE
* operation. If nfs_writedata_alloc() or get_user_pages() fails,
* bail and stop sending more writes. Write length accounting is
* handled automatically by nfs_direct_write_result(). Otherwise, if
* no requests have been sent, just return an error.
*/
static void nfs_direct_write_schedule(struct nfs_direct_req *dreq, int sync)
static ssize_t nfs_direct_write_schedule(struct nfs_direct_req *dreq, unsigned long user_addr, size_t count, loff_t pos, int sync)
{
struct nfs_open_context *ctx = dreq->ctx;
struct inode *inode = ctx->dentry->d_inode;
struct list_head *list = &dreq->list;
struct page **pages = dreq->pages;
size_t count = dreq->user_count;
loff_t pos = dreq->pos;
size_t wsize = NFS_SERVER(inode)->wsize;
unsigned int curpage, pgbase;
unsigned int wpages = nfs_max_pages(wsize);
unsigned int pgbase;
int result;
ssize_t started = 0;
curpage = 0;
pgbase = dreq->user_addr & ~PAGE_MASK;
get_dreq(dreq);
pgbase = user_addr & ~PAGE_MASK;
do {
struct nfs_write_data *data;
size_t bytes;
result = -ENOMEM;
data = nfs_writedata_alloc(wpages);
if (unlikely(!data))
break;
bytes = wsize;
if (count < wsize)
bytes = count;
BUG_ON(list_empty(list));
data = list_entry(list->next, struct nfs_write_data, pages);
data->npages = nfs_direct_count_pages(user_addr, bytes);
down_read(&current->mm->mmap_sem);
result = get_user_pages(current, current->mm, user_addr,
data->npages, 0, 0, data->pagevec, NULL);
up_read(&current->mm->mmap_sem);
if (unlikely(result < data->npages)) {
if (result > 0)
nfs_direct_release_pages(data->pagevec, result);
nfs_writedata_release(data);
break;
}
get_dreq(dreq);
list_move_tail(&data->pages, &dreq->rewrite_list);
data->req = (struct nfs_page *) dreq;
data->inode = inode;
data->cred = ctx->cred;
data->args.fh = NFS_FH(inode);
data->args.context = ctx;
data->args.offset = pos;
data->args.pgbase = pgbase;
data->args.pages = &pages[curpage];
data->args.pages = data->pagevec;
data->args.count = bytes;
data->res.fattr = &data->fattr;
data->res.count = bytes;
@ -694,19 +674,26 @@ static void nfs_direct_write_schedule(struct nfs_direct_req *dreq, int sync)
bytes,
(unsigned long long)data->args.offset);
started += bytes;
user_addr += bytes;
pos += bytes;
pgbase += bytes;
curpage += pgbase >> PAGE_SHIFT;
pgbase &= ~PAGE_MASK;
count -= bytes;
} while (count != 0);
BUG_ON(!list_empty(list));
if (put_dreq(dreq))
nfs_direct_write_complete(dreq, inode);
if (started)
return 0;
return result < 0 ? (ssize_t) result : -EFAULT;
}
static ssize_t nfs_direct_write(struct kiocb *iocb, unsigned long user_addr, size_t count, loff_t pos, struct page **pages, int nr_pages)
static ssize_t nfs_direct_write(struct kiocb *iocb, unsigned long user_addr, size_t count, loff_t pos)
{
ssize_t result;
ssize_t result = 0;
sigset_t oldset;
struct inode *inode = iocb->ki_filp->f_mapping->host;
struct rpc_clnt *clnt = NFS_CLIENT(inode);
@ -714,17 +701,14 @@ static ssize_t nfs_direct_write(struct kiocb *iocb, unsigned long user_addr, siz
size_t wsize = NFS_SERVER(inode)->wsize;
int sync = 0;
dreq = nfs_direct_write_alloc(count, wsize);
dreq = nfs_direct_req_alloc();
if (!dreq)
return -ENOMEM;
nfs_alloc_commit_data(dreq);
if (dreq->commit_data == NULL || count < wsize)
sync = FLUSH_STABLE;
dreq->user_addr = user_addr;
dreq->user_count = count;
dreq->pos = pos;
dreq->pages = pages;
dreq->npages = nr_pages;
dreq->inode = inode;
dreq->ctx = get_nfs_open_context((struct nfs_open_context *)iocb->ki_filp->private_data);
if (!is_sync_kiocb(iocb))
@ -735,8 +719,9 @@ static ssize_t nfs_direct_write(struct kiocb *iocb, unsigned long user_addr, siz
nfs_begin_data_update(inode);
rpc_clnt_sigmask(clnt, &oldset);
nfs_direct_write_schedule(dreq, sync);
result = nfs_direct_wait(dreq);
result = nfs_direct_write_schedule(dreq, user_addr, count, pos, sync);
if (!result)
result = nfs_direct_wait(dreq);
rpc_clnt_sigunmask(clnt, &oldset);
return result;
@ -766,8 +751,6 @@ static ssize_t nfs_direct_write(struct kiocb *iocb, unsigned long user_addr, siz
ssize_t nfs_file_direct_read(struct kiocb *iocb, char __user *buf, size_t count, loff_t pos)
{
ssize_t retval = -EINVAL;
int page_count;
struct page **pages;
struct file *file = iocb->ki_filp;
struct address_space *mapping = file->f_mapping;
@ -789,14 +772,7 @@ ssize_t nfs_file_direct_read(struct kiocb *iocb, char __user *buf, size_t count,
if (retval)
goto out;
retval = nfs_get_user_pages(READ, (unsigned long) buf,
count, &pages);
if (retval < 0)
goto out;
page_count = retval;
retval = nfs_direct_read(iocb, (unsigned long) buf, count, pos,
pages, page_count);
retval = nfs_direct_read(iocb, (unsigned long) buf, count, pos);
if (retval > 0)
iocb->ki_pos = pos + retval;
@ -832,8 +808,6 @@ out:
ssize_t nfs_file_direct_write(struct kiocb *iocb, const char __user *buf, size_t count, loff_t pos)
{
ssize_t retval;
int page_count;
struct page **pages;
struct file *file = iocb->ki_filp;
struct address_space *mapping = file->f_mapping;
@ -861,14 +835,7 @@ ssize_t nfs_file_direct_write(struct kiocb *iocb, const char __user *buf, size_t
if (retval)
goto out;
retval = nfs_get_user_pages(WRITE, (unsigned long) buf,
count, &pages);
if (retval < 0)
goto out;
page_count = retval;
retval = nfs_direct_write(iocb, (unsigned long) buf, count,
pos, pages, page_count);
retval = nfs_direct_write(iocb, (unsigned long) buf, count, pos);
/*
* XXX: nfs_end_data_update() already ensures this file's

2
include/linux/nfs_xdr.h
View File

@ -729,6 +729,7 @@ struct nfs_read_data {
struct list_head pages; /* Coalesced read requests */
struct nfs_page *req; /* multi ops per nfs_page */
struct page **pagevec;
unsigned int npages; /* active pages in pagevec */
struct nfs_readargs args;
struct nfs_readres res;
#ifdef CONFIG_NFS_V4
@ -747,6 +748,7 @@ struct nfs_write_data {
struct list_head pages; /* Coalesced requests we wish to flush */
struct nfs_page *req; /* multi ops per nfs_page */
struct page **pagevec;
unsigned int npages; /* active pages in pagevec */
struct nfs_writeargs args; /* argument struct */
struct nfs_writeres res; /* result struct */
#ifdef CONFIG_NFS_V4