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orangefs: implement writepage

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Now orangefs_inode_getattr fills from cache if an inode has dirty pages.

also if attr_valid and dirty pages and !flags, we spin on inode writeback
before returning if pages still dirty after: should it be other way

Signed-off-by: Martin Brandenburg <martin@omnibond.com>
Signed-off-by: Mike Marshall <hubcap@omnibond.com>
This commit is contained in:
Martin Brandenburg 2018-02-22 18:10:43 +00:00 committed by Mike Marshall
parent c453dcfc79
commit 85ac799cf9
3 changed files with 80 additions and 68 deletions
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75
fs/orangefs/file.c
View File

@ -1,6 +1,7 @@
// SPDX-License-Identifier: GPL-2.0
/*
* (C) 2001 Clemson University and The University of Chicago
* Copyright 2018 Omnibond Systems, L.L.C.
*
* See COPYING in top-level directory.
*/
@ -348,63 +349,11 @@ static ssize_t orangefs_file_read_iter(struct kiocb *iocb,
return generic_file_read_iter(iocb, iter);
}
static ssize_t orangefs_file_write_iter(struct kiocb *iocb, struct iov_iter *iter)
static ssize_t orangefs_file_write_iter(struct kiocb *iocb,
struct iov_iter *iter)
{
struct file *file = iocb->ki_filp;
loff_t pos;
ssize_t rc;
truncate_inode_pages(file->f_mapping, 0);
gossip_debug(GOSSIP_FILE_DEBUG, "orangefs_file_write_iter\n");
inode_lock(file->f_mapping->host);
/* Make sure generic_write_checks sees an up to date inode size. */
if (file->f_flags & O_APPEND) {
rc = orangefs_inode_getattr(file->f_mapping->host,
ORANGEFS_GETATTR_SIZE);
if (rc == -ESTALE)
rc = -EIO;
if (rc) {
gossip_err("%s: orangefs_inode_getattr failed, "
"rc:%zd:.\n", __func__, rc);
goto out;
}
}
rc = generic_write_checks(iocb, iter);
if (rc <= 0) {
gossip_err("%s: generic_write_checks failed, rc:%zd:.\n",
__func__, rc);
goto out;
}
/*
* if we are appending, generic_write_checks would have updated
* pos to the end of the file, so we will wait till now to set
* pos...
*/
pos = iocb->ki_pos;
rc = do_readv_writev(ORANGEFS_IO_WRITE,
file,
&pos,
iter);
if (rc < 0) {
gossip_err("%s: do_readv_writev failed, rc:%zd:.\n",
__func__, rc);
goto out;
}
iocb->ki_pos = pos;
orangefs_stats.writes++;
out:
inode_unlock(file->f_mapping->host);
return rc;
return generic_file_write_iter(iocb, iter);
}
/*
@ -499,9 +448,6 @@ static int orangefs_file_mmap(struct file *file, struct vm_area_struct *vma)
(char *)file->f_path.dentry->d_name.name :
(char *)"Unknown"));
if ((vma->vm_flags & VM_SHARED) && (vma->vm_flags & VM_MAYWRITE))
return -EINVAL;
/* set the sequential readahead hint */
vma->vm_flags |= VM_SEQ_READ;
vma->vm_flags &= ~VM_RAND_READ;
@ -541,8 +487,6 @@ static int orangefs_file_release(struct inode *inode, struct file *file)
gossip_debug(GOSSIP_INODE_DEBUG,
"flush_racache finished\n");
}
truncate_inode_pages(file_inode(file)->i_mapping,
0);
}
return 0;
}
@ -560,6 +504,11 @@ static int orangefs_fsync(struct file *file,
ORANGEFS_I(file_inode(file));
struct orangefs_kernel_op_s *new_op = NULL;
ret = filemap_write_and_wait_range(file_inode(file)->i_mapping,
start, end);
if (ret < 0)
return ret;
new_op = op_alloc(ORANGEFS_VFS_OP_FSYNC);
if (!new_op)
return -ENOMEM;
@ -641,6 +590,11 @@ static int orangefs_lock(struct file *filp, int cmd, struct file_lock *fl)
return rc;
}
static int orangefs_flush(struct file *file, fl_owner_t id)
{
return vfs_fsync(file, 0);
}
/** ORANGEFS implementation of VFS file operations */
const struct file_operations orangefs_file_operations = {
.llseek = orangefs_file_llseek,
@ -650,6 +604,7 @@ const struct file_operations orangefs_file_operations = {
.unlocked_ioctl = orangefs_ioctl,
.mmap = orangefs_file_mmap,
.open = generic_file_open,
.flush = orangefs_flush,
.release = orangefs_file_release,
.fsync = orangefs_fsync,
};

65
fs/orangefs/inode.c
View File

@ -15,6 +15,50 @@
#include "orangefs-kernel.h"
#include "orangefs-bufmap.h"
static int orangefs_writepage(struct page *page, struct writeback_control *wbc)
{
struct inode *inode = page->mapping->host;
struct iov_iter iter;
struct bio_vec bv;
size_t len, wlen;
ssize_t ret;
loff_t off;
set_page_writeback(page);
off = page_offset(page);
len = i_size_read(inode);
if (off > len) {
/* The file was truncated; there is nothing to write. */
unlock_page(page);
end_page_writeback(page);
return 0;
}
if (off + PAGE_SIZE > len)
wlen = len - off;
else
wlen = PAGE_SIZE;
bv.bv_page = page;
bv.bv_len = wlen;
bv.bv_offset = off % PAGE_SIZE;
if (wlen == 0)
dump_stack();
iov_iter_bvec(&iter, WRITE, &bv, 1, wlen);
ret = wait_for_direct_io(ORANGEFS_IO_WRITE, inode, &off, &iter, wlen,
len);
if (ret < 0) {
SetPageError(page);
mapping_set_error(page->mapping, ret);
} else {
ret = 0;
}
unlock_page(page);
end_page_writeback(page);
return ret;
}
static int orangefs_readpage(struct file *file, struct page *page)
{
struct inode *inode = page->mapping->host;
@ -48,6 +92,15 @@ static int orangefs_readpage(struct file *file, struct page *page)
return ret;
}
static int orangefs_write_end(struct file *file, struct address_space *mapping,
loff_t pos, unsigned len, unsigned copied, struct page *page, void *fsdata)
{
int r;
r = simple_write_end(file, mapping, pos, len, copied, page, fsdata);
mark_inode_dirty_sync(file_inode(file));
return r;
}
static void orangefs_invalidatepage(struct page *page,
unsigned int offset,
unsigned int length)
@ -77,17 +130,17 @@ static ssize_t orangefs_direct_IO(struct kiocb *iocb,
{
struct file *file = iocb->ki_filp;
loff_t pos = *(&iocb->ki_pos);
/*
* This cannot happen until write_iter becomes
* generic_file_write_iter.
*/
BUG_ON(iov_iter_rw(iter) != READ);
return do_readv_writev(ORANGEFS_IO_READ, file, &pos, iter);
return do_readv_writev(iov_iter_rw(iter) == WRITE ?
ORANGEFS_IO_WRITE : ORANGEFS_IO_READ, file, &pos, iter);
}
/** ORANGEFS2 implementation of address space operations */
static const struct address_space_operations orangefs_address_operations = {
.writepage = orangefs_writepage,
.readpage = orangefs_readpage,
.set_page_dirty = __set_page_dirty_nobuffers,
.write_begin = simple_write_begin,
.write_end = orangefs_write_end,
.invalidatepage = orangefs_invalidatepage,
.releasepage = orangefs_releasepage,
.direct_IO = orangefs_direct_IO,

8
fs/orangefs/orangefs-utils.c
View File

@ -247,7 +247,7 @@ int orangefs_inode_getattr(struct inode *inode, int flags)
spin_lock(&inode->i_lock);
/* Must have all the attributes in the mask and be within cache time. */
if ((!flags && time_before(jiffies, orangefs_inode->getattr_time)) ||
orangefs_inode->attr_valid) {
orangefs_inode->attr_valid || inode->i_state & I_DIRTY_PAGES) {
if (orangefs_inode->attr_valid) {
spin_unlock(&inode->i_lock);
write_inode_now(inode, 1);
@ -281,12 +281,16 @@ int orangefs_inode_getattr(struct inode *inode, int flags)
spin_lock(&inode->i_lock);
/* Must have all the attributes in the mask and be within cache time. */
if ((!flags && time_before(jiffies, orangefs_inode->getattr_time)) ||
orangefs_inode->attr_valid) {
orangefs_inode->attr_valid || inode->i_state & I_DIRTY_PAGES) {
if (orangefs_inode->attr_valid) {
spin_unlock(&inode->i_lock);
write_inode_now(inode, 1);
goto again2;
}
if (inode->i_state & I_DIRTY_PAGES) {
ret = 0;
goto out_unlock;
}
gossip_debug(GOSSIP_UTILS_DEBUG, "%s: in cache or dirty\n",
__func__);
ret = 0;