Commit bfc1af65 authored by Nick Piggin's avatar Nick Piggin Committed by Linus Torvalds
Browse files

ext4: convert to new aops



Convert ext4 to use write_begin()/write_end() methods.

Signed-off-by: default avatarBadari Pulavarty <pbadari@us.ibm.com>
Signed-off-by: default avatarNick Piggin <npiggin@suse.de>
Cc: Dmitriy Monakhov <dmonakhov@sw.ru>
Cc: Mark Fasheh <mark.fasheh@oracle.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent f4fc66a8
......@@ -1146,34 +1146,50 @@ static int do_journal_get_write_access(handle_t *handle,
return ext4_journal_get_write_access(handle, bh);
}
static int ext4_prepare_write(struct file *file, struct page *page,
unsigned from, unsigned to)
static int ext4_write_begin(struct file *file, struct address_space *mapping,
loff_t pos, unsigned len, unsigned flags,
struct page **pagep, void **fsdata)
{
struct inode *inode = page->mapping->host;
struct inode *inode = mapping->host;
int ret, needed_blocks = ext4_writepage_trans_blocks(inode);
handle_t *handle;
int retries = 0;
struct page *page;
pgoff_t index;
unsigned from, to;
index = pos >> PAGE_CACHE_SHIFT;
from = pos & (PAGE_CACHE_SIZE - 1);
to = from + len;
retry:
handle = ext4_journal_start(inode, needed_blocks);
if (IS_ERR(handle)) {
ret = PTR_ERR(handle);
goto out;
page = __grab_cache_page(mapping, index);
if (!page)
return -ENOMEM;
*pagep = page;
handle = ext4_journal_start(inode, needed_blocks);
if (IS_ERR(handle)) {
unlock_page(page);
page_cache_release(page);
ret = PTR_ERR(handle);
goto out;
}
if (test_opt(inode->i_sb, NOBH) && ext4_should_writeback_data(inode))
ret = nobh_prepare_write(page, from, to, ext4_get_block);
else
ret = block_prepare_write(page, from, to, ext4_get_block);
if (ret)
goto prepare_write_failed;
if (ext4_should_journal_data(inode)) {
ret = block_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
ext4_get_block);
if (!ret && ext4_should_journal_data(inode)) {
ret = walk_page_buffers(handle, page_buffers(page),
from, to, NULL, do_journal_get_write_access);
}
prepare_write_failed:
if (ret)
if (ret) {
ext4_journal_stop(handle);
unlock_page(page);
page_cache_release(page);
}
if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
goto retry;
out:
......@@ -1185,12 +1201,12 @@ int ext4_journal_dirty_data(handle_t *handle, struct buffer_head *bh)
int err = jbd2_journal_dirty_data(handle, bh);
if (err)
ext4_journal_abort_handle(__FUNCTION__, __FUNCTION__,
bh, handle,err);
bh, handle, err);
return err;
}
/* For commit_write() in data=journal mode */
static int commit_write_fn(handle_t *handle, struct buffer_head *bh)
/* For write_end() in data=journal mode */
static int write_end_fn(handle_t *handle, struct buffer_head *bh)
{
if (!buffer_mapped(bh) || buffer_freed(bh))
return 0;
......@@ -1198,6 +1214,29 @@ static int commit_write_fn(handle_t *handle, struct buffer_head *bh)
return ext4_journal_dirty_metadata(handle, bh);
}
/*
* Generic write_end handler for ordered and writeback ext4 journal modes.
* We can't use generic_write_end, because that unlocks the page and we need to
* unlock the page after ext4_journal_stop, but ext4_journal_stop must run
* after block_write_end.
*/
static int ext4_generic_write_end(struct file *file,
struct address_space *mapping,
loff_t pos, unsigned len, unsigned copied,
struct page *page, void *fsdata)
{
struct inode *inode = file->f_mapping->host;
copied = block_write_end(file, mapping, pos, len, copied, page, fsdata);
if (pos+copied > inode->i_size) {
i_size_write(inode, pos+copied);
mark_inode_dirty(inode);
}
return copied;
}
/*
* We need to pick up the new inode size which generic_commit_write gave us
* `file' can be NULL - eg, when called from page_symlink().
......@@ -1205,78 +1244,101 @@ static int commit_write_fn(handle_t *handle, struct buffer_head *bh)
* ext4 never places buffers on inode->i_mapping->private_list. metadata
* buffers are managed internally.
*/
static int ext4_ordered_commit_write(struct file *file, struct page *page,
unsigned from, unsigned to)
static int ext4_ordered_write_end(struct file *file,
struct address_space *mapping,
loff_t pos, unsigned len, unsigned copied,
struct page *page, void *fsdata)
{
handle_t *handle = ext4_journal_current_handle();
struct inode *inode = page->mapping->host;
struct inode *inode = file->f_mapping->host;
unsigned from, to;
int ret = 0, ret2;
from = pos & (PAGE_CACHE_SIZE - 1);
to = from + len;
ret = walk_page_buffers(handle, page_buffers(page),
from, to, NULL, ext4_journal_dirty_data);
if (ret == 0) {
/*
* generic_commit_write() will run mark_inode_dirty() if i_size
* generic_write_end() will run mark_inode_dirty() if i_size
* changes. So let's piggyback the i_disksize mark_inode_dirty
* into that.
*/
loff_t new_i_size;
new_i_size = ((loff_t)page->index << PAGE_CACHE_SHIFT) + to;
new_i_size = pos + copied;
if (new_i_size > EXT4_I(inode)->i_disksize)
EXT4_I(inode)->i_disksize = new_i_size;
ret = generic_commit_write(file, page, from, to);
copied = ext4_generic_write_end(file, mapping, pos, len, copied,
page, fsdata);
if (copied < 0)
ret = copied;
}
ret2 = ext4_journal_stop(handle);
if (!ret)
ret = ret2;
return ret;
unlock_page(page);
page_cache_release(page);
return ret ? ret : copied;
}
static int ext4_writeback_commit_write(struct file *file, struct page *page,
unsigned from, unsigned to)
static int ext4_writeback_write_end(struct file *file,
struct address_space *mapping,
loff_t pos, unsigned len, unsigned copied,
struct page *page, void *fsdata)
{
handle_t *handle = ext4_journal_current_handle();
struct inode *inode = page->mapping->host;
struct inode *inode = file->f_mapping->host;
int ret = 0, ret2;
loff_t new_i_size;
new_i_size = ((loff_t)page->index << PAGE_CACHE_SHIFT) + to;
new_i_size = pos + copied;
if (new_i_size > EXT4_I(inode)->i_disksize)
EXT4_I(inode)->i_disksize = new_i_size;
if (test_opt(inode->i_sb, NOBH) && ext4_should_writeback_data(inode))
ret = nobh_commit_write(file, page, from, to);
else
ret = generic_commit_write(file, page, from, to);
copied = ext4_generic_write_end(file, mapping, pos, len, copied,
page, fsdata);
if (copied < 0)
ret = copied;
ret2 = ext4_journal_stop(handle);
if (!ret)
ret = ret2;
return ret;
unlock_page(page);
page_cache_release(page);
return ret ? ret : copied;
}
static int ext4_journalled_commit_write(struct file *file,
struct page *page, unsigned from, unsigned to)
static int ext4_journalled_write_end(struct file *file,
struct address_space *mapping,
loff_t pos, unsigned len, unsigned copied,
struct page *page, void *fsdata)
{
handle_t *handle = ext4_journal_current_handle();
struct inode *inode = page->mapping->host;
struct inode *inode = mapping->host;
int ret = 0, ret2;
int partial = 0;
loff_t pos;
unsigned from, to;
/*
* Here we duplicate the generic_commit_write() functionality
*/
pos = ((loff_t)page->index << PAGE_CACHE_SHIFT) + to;
from = pos & (PAGE_CACHE_SIZE - 1);
to = from + len;
if (copied < len) {
if (!PageUptodate(page))
copied = 0;
page_zero_new_buffers(page, from+copied, to);
}
ret = walk_page_buffers(handle, page_buffers(page), from,
to, &partial, commit_write_fn);
to, &partial, write_end_fn);
if (!partial)
SetPageUptodate(page);
if (pos > inode->i_size)
i_size_write(inode, pos);
if (pos+copied > inode->i_size)
i_size_write(inode, pos+copied);
EXT4_I(inode)->i_state |= EXT4_STATE_JDATA;
if (inode->i_size > EXT4_I(inode)->i_disksize) {
EXT4_I(inode)->i_disksize = inode->i_size;
......@@ -1284,10 +1346,14 @@ static int ext4_journalled_commit_write(struct file *file,
if (!ret)
ret = ret2;
}
ret2 = ext4_journal_stop(handle);
if (!ret)
ret = ret2;
return ret;
unlock_page(page);
page_cache_release(page);
return ret ? ret : copied;
}
/*
......@@ -1545,7 +1611,7 @@ static int ext4_journalled_writepage(struct page *page,
PAGE_CACHE_SIZE, NULL, do_journal_get_write_access);
err = walk_page_buffers(handle, page_buffers(page), 0,
PAGE_CACHE_SIZE, NULL, commit_write_fn);
PAGE_CACHE_SIZE, NULL, write_end_fn);
if (ret == 0)
ret = err;
EXT4_I(inode)->i_state |= EXT4_STATE_JDATA;
......@@ -1705,8 +1771,8 @@ static const struct address_space_operations ext4_ordered_aops = {
.readpages = ext4_readpages,
.writepage = ext4_ordered_writepage,
.sync_page = block_sync_page,
.prepare_write = ext4_prepare_write,
.commit_write = ext4_ordered_commit_write,
.write_begin = ext4_write_begin,
.write_end = ext4_ordered_write_end,
.bmap = ext4_bmap,
.invalidatepage = ext4_invalidatepage,
.releasepage = ext4_releasepage,
......@@ -1719,8 +1785,8 @@ static const struct address_space_operations ext4_writeback_aops = {
.readpages = ext4_readpages,
.writepage = ext4_writeback_writepage,
.sync_page = block_sync_page,
.prepare_write = ext4_prepare_write,
.commit_write = ext4_writeback_commit_write,
.write_begin = ext4_write_begin,
.write_end = ext4_writeback_write_end,
.bmap = ext4_bmap,
.invalidatepage = ext4_invalidatepage,
.releasepage = ext4_releasepage,
......@@ -1733,8 +1799,8 @@ static const struct address_space_operations ext4_journalled_aops = {
.readpages = ext4_readpages,
.writepage = ext4_journalled_writepage,
.sync_page = block_sync_page,
.prepare_write = ext4_prepare_write,
.commit_write = ext4_journalled_commit_write,
.write_begin = ext4_write_begin,
.write_end = ext4_journalled_write_end,
.set_page_dirty = ext4_journalled_set_page_dirty,
.bmap = ext4_bmap,
.invalidatepage = ext4_invalidatepage,
......
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