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NFS: Clean up nfs_readpage() and nfs_readpages() 

In prep for the new fscache netfs API, refactor nfs_readpage()
and nfs_readpages() for future patches.  No functional change.

Signed-off-by: Dave Wysochanski <dwysocha@redhat.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Dave Wysochanski 2021-01-28 09:54:59 -05:00 committed by Anna Schumaker
parent ffb81717a1
commit 49dee70052
1 changed files with 23 additions and 22 deletions
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45
fs/nfs/read.c
View File

@ -314,7 +314,7 @@ int nfs_readpage(struct file *file, struct page *page)
{
struct nfs_open_context *ctx;
struct inode *inode = page_file_mapping(page)->host;
int error;
int ret;
dprintk("NFS: nfs_readpage (%p %ld@%lu)\n",
page, PAGE_SIZE, page_index(page));
@ -328,18 +328,18 @@ int nfs_readpage(struct file *file, struct page *page)
* be any new pending writes generated at this point
* for this page (other pages can be written to).
*/
error = nfs_wb_page(inode, page);
if (error)
ret = nfs_wb_page(inode, page);
if (ret)
goto out_unlock;
if (PageUptodate(page))
goto out_unlock;
error = -ESTALE;
ret = -ESTALE;
if (NFS_STALE(inode))
goto out_unlock;
if (file == NULL) {
error = -EBADF;
ret = -EBADF;
ctx = nfs_find_open_context(inode, NULL, FMODE_READ);
if (ctx == NULL)
goto out_unlock;
@ -347,24 +347,24 @@ int nfs_readpage(struct file *file, struct page *page)
ctx = get_nfs_open_context(nfs_file_open_context(file));
if (!IS_SYNC(inode)) {
error = nfs_readpage_from_fscache(ctx, inode, page);
if (error == 0)
ret = nfs_readpage_from_fscache(ctx, inode, page);
if (ret == 0)
goto out;
}
xchg(&ctx->error, 0);
error = nfs_readpage_async(ctx, inode, page);
if (!error) {
error = wait_on_page_locked_killable(page);
if (!PageUptodate(page) && !error)
error = xchg(&ctx->error, 0);
ret = nfs_readpage_async(ctx, inode, page);
if (!ret) {
ret = wait_on_page_locked_killable(page);
if (!PageUptodate(page) && !ret)
ret = xchg(&ctx->error, 0);
}
out:
put_nfs_open_context(ctx);
return error;
return ret;
out_unlock:
unlock_page(page);
return error;
return ret;
}
struct nfs_readdesc {
@ -404,17 +404,15 @@ out:
return error;
}
int nfs_readpages(struct file *filp, struct address_space *mapping,
int nfs_readpages(struct file *file, struct address_space *mapping,
struct list_head *pages, unsigned nr_pages)
{
struct nfs_pageio_descriptor pgio;
struct nfs_pgio_mirror *pgm;
struct nfs_readdesc desc = {
.pgio = &pgio,
};
struct nfs_readdesc desc;
struct inode *inode = mapping->host;
unsigned long npages;
int ret = -ESTALE;
int ret;
dprintk("NFS: nfs_readpages (%s/%Lu %d)\n",
inode->i_sb->s_id,
@ -422,15 +420,17 @@ int nfs_readpages(struct file *filp, struct address_space *mapping,
nr_pages);
nfs_inc_stats(inode, NFSIOS_VFSREADPAGES);
ret = -ESTALE;
if (NFS_STALE(inode))
goto out;
if (filp == NULL) {
if (file == NULL) {
ret = -EBADF;
desc.ctx = nfs_find_open_context(inode, NULL, FMODE_READ);
if (desc.ctx == NULL)
return -EBADF;
goto out;
} else
desc.ctx = get_nfs_open_context(nfs_file_open_context(filp));
desc.ctx = get_nfs_open_context(nfs_file_open_context(file));
/* attempt to read as many of the pages as possible from the cache
* - this returns -ENOBUFS immediately if the cookie is negative
@ -440,6 +440,7 @@ int nfs_readpages(struct file *filp, struct address_space *mapping,
if (ret == 0)
goto read_complete; /* all pages were read */
desc.pgio = &pgio;
nfs_pageio_init_read(&pgio, inode, false,
&nfs_async_read_completion_ops);