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NFS: Add support for eager writes 

Support eager writing to the server, meaning that we write the data to
cache on the server, and wait for that to complete. This ensures that we
see ENOSPC errors immediately.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
master
Trond Myklebust 2021-02-12 16:49:48 -05:00 committed by Anna Schumaker
parent 75cfb200cd
commit ed7bcdb374
3 changed files with 31 additions and 7 deletions
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19
fs/nfs/file.c
View File

@ -606,8 +606,8 @@ 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;
unsigned int mntflags = NFS_SERVER(inode)->flags;
ssize_t result, written;
errseq_t since;
int error;
@ -648,6 +648,21 @@ ssize_t nfs_file_write(struct kiocb *iocb, struct iov_iter *from)
written = result;
iocb->ki_pos += written;
if (mntflags & NFS_MOUNT_WRITE_EAGER) {
result = filemap_fdatawrite_range(file->f_mapping,
iocb->ki_pos - written,
iocb->ki_pos - 1);
if (result < 0)
goto out;
}
if (mntflags & NFS_MOUNT_WRITE_WAIT) {
result = filemap_fdatawait_range(file->f_mapping,
iocb->ki_pos - written,
iocb->ki_pos - 1);
if (result < 0)
goto out;
}
result = generic_write_sync(iocb, written);
if (result < 0)
goto out;

17
fs/nfs/write.c
View File

@ -712,16 +712,23 @@ int nfs_writepages(struct address_space *mapping, struct writeback_control *wbc)
{
struct inode *inode = mapping->host;
struct nfs_pageio_descriptor pgio;
struct nfs_io_completion *ioc;
struct nfs_io_completion *ioc = NULL;
unsigned int mntflags = NFS_SERVER(inode)->flags;
int priority = 0;
int err;
nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGES);
ioc = nfs_io_completion_alloc(GFP_KERNEL);
if (ioc)
nfs_io_completion_init(ioc, nfs_io_completion_commit, inode);
if (!(mntflags & NFS_MOUNT_WRITE_EAGER) || wbc->for_kupdate ||
wbc->for_background || wbc->for_sync || wbc->for_reclaim) {
ioc = nfs_io_completion_alloc(GFP_KERNEL);
if (ioc)
nfs_io_completion_init(ioc, nfs_io_completion_commit,
inode);
priority = wb_priority(wbc);
}
nfs_pageio_init_write(&pgio, inode, wb_priority(wbc), false,
nfs_pageio_init_write(&pgio, inode, priority, false,
&nfs_async_write_completion_ops);
pgio.pg_io_completion = ioc;
err = write_cache_pages(mapping, wbc, nfs_writepages_callback, &pgio);

2
include/linux/nfs_fs_sb.h
View File

@ -153,6 +153,8 @@ struct nfs_server {
#define NFS_MOUNT_LOCAL_FCNTL 0x200000
#define NFS_MOUNT_SOFTERR 0x400000
#define NFS_MOUNT_SOFTREVAL 0x800000
#define NFS_MOUNT_WRITE_EAGER 0x01000000
#define NFS_MOUNT_WRITE_WAIT 0x02000000
unsigned int caps; /* server capabilities */
unsigned int rsize; /* read size */