Commit 4da00fd1 authored by Al Viro's avatar Al Viro

Merge branch 'work.write_end' into for-linus

parents f0bb5aaf 04fff641
......@@ -309,18 +309,10 @@ static int v9fs_write_end(struct file *filp, struct address_space *mapping,
p9_debug(P9_DEBUG_VFS, "filp %p, mapping %p\n", filp, mapping);
if (unlikely(copied < len)) {
/*
* zero out the rest of the area
*/
unsigned from = pos & (PAGE_SIZE - 1);
zero_user(page, from + copied, len - copied);
flush_dcache_page(page);
if (unlikely(copied < len && !PageUptodate(page))) {
copied = 0;
goto out;
}
if (!PageUptodate(page))
SetPageUptodate(page);
/*
* No need to use i_size_read() here, the i_size
* cannot change under us because we hold the i_mutex.
......@@ -330,6 +322,7 @@ static int v9fs_write_end(struct file *filp, struct address_space *mapping,
i_size_write(inode, last_pos);
}
set_page_dirty(page);
out:
unlock_page(page);
put_page(page);
......
......@@ -1276,25 +1276,27 @@ static int ceph_write_end(struct file *file, struct address_space *mapping,
struct page *page, void *fsdata)
{
struct inode *inode = file_inode(file);
unsigned from = pos & (PAGE_SIZE - 1);
int check_cap = 0;
dout("write_end file %p inode %p page %p %d~%d (%d)\n", file,
inode, page, (int)pos, (int)copied, (int)len);
/* zero the stale part of the page if we did a short copy */
if (copied < len)
zero_user_segment(page, from+copied, len);
if (!PageUptodate(page)) {
if (copied < len) {
copied = 0;
goto out;
}
SetPageUptodate(page);
}
/* did file size increase? */
if (pos+copied > i_size_read(inode))
check_cap = ceph_inode_set_size(inode, pos+copied);
if (!PageUptodate(page))
SetPageUptodate(page);
set_page_dirty(page);
out:
unlock_page(page);
put_page(page);
......
......@@ -870,46 +870,31 @@ int exofs_write_begin(struct file *file, struct address_space *mapping,
page = *pagep;
if (page == NULL) {
ret = simple_write_begin(file, mapping, pos, len, flags, pagep,
fsdata);
if (ret) {
EXOFS_DBGMSG("simple_write_begin failed\n");
goto out;
page = grab_cache_page_write_begin(mapping, pos >> PAGE_SHIFT,
flags);
if (!page) {
EXOFS_DBGMSG("grab_cache_page_write_begin failed\n");
return -ENOMEM;
}
page = *pagep;
*pagep = page;
}
/* read modify write */
if (!PageUptodate(page) && (len != PAGE_SIZE)) {
loff_t i_size = i_size_read(mapping->host);
pgoff_t end_index = i_size >> PAGE_SHIFT;
size_t rlen;
if (page->index < end_index)
rlen = PAGE_SIZE;
else if (page->index == end_index)
rlen = i_size & ~PAGE_MASK;
else
rlen = 0;
if (!rlen) {
if (page->index > end_index) {
clear_highpage(page);
SetPageUptodate(page);
goto out;
}
} else {
ret = _readpage(page, true);
if (ret) {
/*SetPageError was done by _readpage. Is it ok?*/
unlock_page(page);
EXOFS_DBGMSG("__readpage failed\n");
}
}
out:
if (unlikely(ret))
_write_failed(mapping->host, pos + len);
}
return ret;
}
......@@ -929,18 +914,25 @@ static int exofs_write_end(struct file *file, struct address_space *mapping,
struct page *page, void *fsdata)
{
struct inode *inode = mapping->host;
/* According to comment in simple_write_end i_mutex is held */
loff_t i_size = inode->i_size;
int ret;
loff_t last_pos = pos + copied;
ret = simple_write_end(file, mapping,pos, len, copied, page, fsdata);
if (unlikely(ret))
if (!PageUptodate(page)) {
if (copied < len) {
_write_failed(inode, pos + len);
/* TODO: once simple_write_end marks inode dirty remove */
if (i_size != inode->i_size)
copied = 0;
goto out;
}
SetPageUptodate(page);
}
if (last_pos > inode->i_size) {
i_size_write(inode, last_pos);
mark_inode_dirty(inode);
return ret;
}
set_page_dirty(page);
out:
unlock_page(page);
put_page(page);
return copied;
}
static int exofs_releasepage(struct page *page, gfp_t gfp)
......
......@@ -839,12 +839,10 @@ static int gfs2_stuffed_write_end(struct inode *inode, struct buffer_head *dibh,
BUG_ON((pos + len) > (dibh->b_size - sizeof(struct gfs2_dinode)));
kaddr = kmap_atomic(page);
memcpy(buf + pos, kaddr + pos, copied);
memset(kaddr + pos + copied, 0, len - copied);
flush_dcache_page(page);
kunmap_atomic(kaddr);
if (!PageUptodate(page))
SetPageUptodate(page);
WARN_ON(!PageUptodate(page));
unlock_page(page);
put_page(page);
......
......@@ -465,6 +465,8 @@ EXPORT_SYMBOL(simple_write_begin);
* is not called, so a filesystem that actually does store data in .write_inode
* should extend on what's done here with a call to mark_inode_dirty() in the
* case that i_size has changed.
*
* Use *ONLY* with simple_readpage()
*/
int simple_write_end(struct file *file, struct address_space *mapping,
loff_t pos, unsigned len, unsigned copied,
......@@ -474,14 +476,14 @@ int simple_write_end(struct file *file, struct address_space *mapping,
loff_t last_pos = pos + copied;
/* zero the stale part of the page if we did a short copy */
if (!PageUptodate(page)) {
if (copied < len) {
unsigned from = pos & (PAGE_SIZE - 1);
zero_user(page, from + copied, len - copied);
}
if (!PageUptodate(page))
SetPageUptodate(page);
}
/*
* No need to use i_size_read() here, the i_size
* cannot change under us because we hold the i_mutex.
......
......@@ -374,7 +374,7 @@ static int nfs_write_end(struct file *file, struct address_space *mapping,
*/
if (!PageUptodate(page)) {
unsigned pglen = nfs_page_length(page);
unsigned end = offset + len;
unsigned end = offset + copied;
if (pglen == 0) {
zero_user_segments(page, 0, offset,
......
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