提交 f4fc66a8 编写于 作者: N Nick Piggin 提交者: Linus Torvalds

ext3: convert to new aops

Various fixes and improvements
Signed-off-by: NBadari Pulavarty <pbadari@us.ibm.com>
Signed-off-by: NNick Piggin <npiggin@suse.de>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
上级 f34fb6ec
......@@ -1147,51 +1147,68 @@ static int do_journal_get_write_access(handle_t *handle,
return ext3_journal_get_write_access(handle, bh);
}
static int ext3_prepare_write(struct file *file, struct page *page,
unsigned from, unsigned to)
static int ext3_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 = ext3_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:
page = __grab_cache_page(mapping, index);
if (!page)
return -ENOMEM;
*pagep = page;
handle = ext3_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) && ext3_should_writeback_data(inode))
ret = nobh_prepare_write(page, from, to, ext3_get_block);
else
ret = block_prepare_write(page, from, to, ext3_get_block);
ret = block_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
ext3_get_block);
if (ret)
goto prepare_write_failed;
goto write_begin_failed;
if (ext3_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)
write_begin_failed:
if (ret) {
ext3_journal_stop(handle);
unlock_page(page);
page_cache_release(page);
}
if (ret == -ENOSPC && ext3_should_retry_alloc(inode->i_sb, &retries))
goto retry;
out:
return ret;
}
int ext3_journal_dirty_data(handle_t *handle, struct buffer_head *bh)
{
int err = journal_dirty_data(handle, bh);
if (err)
ext3_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;
......@@ -1199,6 +1216,29 @@ static int commit_write_fn(handle_t *handle, struct buffer_head *bh)
return ext3_journal_dirty_metadata(handle, bh);
}
/*
* Generic write_end handler for ordered and writeback ext3 journal modes.
* We can't use generic_write_end, because that unlocks the page and we need to
* unlock the page after ext3_journal_stop, but ext3_journal_stop must run
* after block_write_end.
*/
static int ext3_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().
......@@ -1206,78 +1246,101 @@ static int commit_write_fn(handle_t *handle, struct buffer_head *bh)
* ext3 never places buffers on inode->i_mapping->private_list. metadata
* buffers are managed internally.
*/
static int ext3_ordered_commit_write(struct file *file, struct page *page,
unsigned from, unsigned to)
static int ext3_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 = ext3_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, ext3_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 > EXT3_I(inode)->i_disksize)
EXT3_I(inode)->i_disksize = new_i_size;
ret = generic_commit_write(file, page, from, to);
copied = ext3_generic_write_end(file, mapping, pos, len, copied,
page, fsdata);
if (copied < 0)
ret = copied;
}
ret2 = ext3_journal_stop(handle);
if (!ret)
ret = ret2;
return ret;
unlock_page(page);
page_cache_release(page);
return ret ? ret : copied;
}
static int ext3_writeback_commit_write(struct file *file, struct page *page,
unsigned from, unsigned to)
static int ext3_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 = ext3_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 > EXT3_I(inode)->i_disksize)
EXT3_I(inode)->i_disksize = new_i_size;
if (test_opt(inode->i_sb, NOBH) && ext3_should_writeback_data(inode))
ret = nobh_commit_write(file, page, from, to);
else
ret = generic_commit_write(file, page, from, to);
copied = ext3_generic_write_end(file, mapping, pos, len, copied,
page, fsdata);
if (copied < 0)
ret = copied;
ret2 = ext3_journal_stop(handle);
if (!ret)
ret = ret2;
return ret;
unlock_page(page);
page_cache_release(page);
return ret ? ret : copied;
}
static int ext3_journalled_commit_write(struct file *file,
struct page *page, unsigned from, unsigned to)
static int ext3_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 = ext3_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);
EXT3_I(inode)->i_state |= EXT3_STATE_JDATA;
if (inode->i_size > EXT3_I(inode)->i_disksize) {
EXT3_I(inode)->i_disksize = inode->i_size;
......@@ -1285,10 +1348,14 @@ static int ext3_journalled_commit_write(struct file *file,
if (!ret)
ret = ret2;
}
ret2 = ext3_journal_stop(handle);
if (!ret)
ret = ret2;
return ret;
unlock_page(page);
page_cache_release(page);
return ret ? ret : copied;
}
/*
......@@ -1546,7 +1613,7 @@ static int ext3_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;
EXT3_I(inode)->i_state |= EXT3_STATE_JDATA;
......@@ -1706,8 +1773,8 @@ static const struct address_space_operations ext3_ordered_aops = {
.readpages = ext3_readpages,
.writepage = ext3_ordered_writepage,
.sync_page = block_sync_page,
.prepare_write = ext3_prepare_write,
.commit_write = ext3_ordered_commit_write,
.write_begin = ext3_write_begin,
.write_end = ext3_ordered_write_end,
.bmap = ext3_bmap,
.invalidatepage = ext3_invalidatepage,
.releasepage = ext3_releasepage,
......@@ -1720,8 +1787,8 @@ static const struct address_space_operations ext3_writeback_aops = {
.readpages = ext3_readpages,
.writepage = ext3_writeback_writepage,
.sync_page = block_sync_page,
.prepare_write = ext3_prepare_write,
.commit_write = ext3_writeback_commit_write,
.write_begin = ext3_write_begin,
.write_end = ext3_writeback_write_end,
.bmap = ext3_bmap,
.invalidatepage = ext3_invalidatepage,
.releasepage = ext3_releasepage,
......@@ -1734,8 +1801,8 @@ static const struct address_space_operations ext3_journalled_aops = {
.readpages = ext3_readpages,
.writepage = ext3_journalled_writepage,
.sync_page = block_sync_page,
.prepare_write = ext3_prepare_write,
.commit_write = ext3_journalled_commit_write,
.write_begin = ext3_write_begin,
.write_end = ext3_journalled_write_end,
.set_page_dirty = ext3_journalled_set_page_dirty,
.bmap = ext3_bmap,
.invalidatepage = ext3_invalidatepage,
......
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