ext4: convert to new aops
Convert ext4 to use write_begin()/write_end() methods. Signed-off-by: Badari Pulavarty <pbadari@us.ibm.com> Signed-off-by: Nick Piggin <npiggin@suse.de> Cc: Dmitriy Monakhov <dmonakhov@sw.ru> Cc: Mark Fasheh <mark.fasheh@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Nick Piggin
Linus Torvalds
parent
f4fc66a894
commit
bfc1af650a
1 changed files with 121 additions and 55 deletions
176
fs/ext4/inode.c
176
fs/ext4/inode.c
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@ -1146,34 +1146,50 @@ static int do_journal_get_write_access(handle_t *handle,
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return ext4_journal_get_write_access(handle, bh);
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}
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static int ext4_prepare_write(struct file *file, struct page *page,
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unsigned from, unsigned to)
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static int ext4_write_begin(struct file *file, struct address_space *mapping,
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loff_t pos, unsigned len, unsigned flags,
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struct page **pagep, void **fsdata)
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{
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struct inode *inode = page->mapping->host;
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struct inode *inode = mapping->host;
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int ret, needed_blocks = ext4_writepage_trans_blocks(inode);
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handle_t *handle;
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int retries = 0;
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struct page *page;
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pgoff_t index;
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unsigned from, to;
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index = pos >> PAGE_CACHE_SHIFT;
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from = pos & (PAGE_CACHE_SIZE - 1);
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to = from + len;
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retry:
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handle = ext4_journal_start(inode, needed_blocks);
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if (IS_ERR(handle)) {
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ret = PTR_ERR(handle);
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goto out;
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}
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if (test_opt(inode->i_sb, NOBH) && ext4_should_writeback_data(inode))
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ret = nobh_prepare_write(page, from, to, ext4_get_block);
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else
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ret = block_prepare_write(page, from, to, ext4_get_block);
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if (ret)
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goto prepare_write_failed;
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page = __grab_cache_page(mapping, index);
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if (!page)
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return -ENOMEM;
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*pagep = page;
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if (ext4_should_journal_data(inode)) {
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handle = ext4_journal_start(inode, needed_blocks);
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if (IS_ERR(handle)) {
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unlock_page(page);
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page_cache_release(page);
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ret = PTR_ERR(handle);
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goto out;
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}
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ret = block_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
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ext4_get_block);
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if (!ret && ext4_should_journal_data(inode)) {
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ret = walk_page_buffers(handle, page_buffers(page),
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from, to, NULL, do_journal_get_write_access);
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}
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prepare_write_failed:
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if (ret)
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if (ret) {
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ext4_journal_stop(handle);
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unlock_page(page);
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page_cache_release(page);
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}
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if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
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goto retry;
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out:
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@ -1185,12 +1201,12 @@ int ext4_journal_dirty_data(handle_t *handle, struct buffer_head *bh)
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int err = jbd2_journal_dirty_data(handle, bh);
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if (err)
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ext4_journal_abort_handle(__FUNCTION__, __FUNCTION__,
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bh, handle,err);
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bh, handle, err);
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return err;
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}
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/* For commit_write() in data=journal mode */
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static int commit_write_fn(handle_t *handle, struct buffer_head *bh)
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/* For write_end() in data=journal mode */
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static int write_end_fn(handle_t *handle, struct buffer_head *bh)
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{
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if (!buffer_mapped(bh) || buffer_freed(bh))
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return 0;
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@ -1198,6 +1214,29 @@ static int commit_write_fn(handle_t *handle, struct buffer_head *bh)
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return ext4_journal_dirty_metadata(handle, bh);
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}
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/*
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* Generic write_end handler for ordered and writeback ext4 journal modes.
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* We can't use generic_write_end, because that unlocks the page and we need to
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* unlock the page after ext4_journal_stop, but ext4_journal_stop must run
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* after block_write_end.
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*/
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static int ext4_generic_write_end(struct file *file,
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struct address_space *mapping,
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loff_t pos, unsigned len, unsigned copied,
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struct page *page, void *fsdata)
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{
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struct inode *inode = file->f_mapping->host;
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copied = block_write_end(file, mapping, pos, len, copied, page, fsdata);
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if (pos+copied > inode->i_size) {
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i_size_write(inode, pos+copied);
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mark_inode_dirty(inode);
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}
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return copied;
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}
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/*
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* We need to pick up the new inode size which generic_commit_write gave us
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* `file' can be NULL - eg, when called from page_symlink().
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@ -1205,78 +1244,101 @@ static int commit_write_fn(handle_t *handle, struct buffer_head *bh)
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* ext4 never places buffers on inode->i_mapping->private_list. metadata
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* buffers are managed internally.
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*/
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static int ext4_ordered_commit_write(struct file *file, struct page *page,
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unsigned from, unsigned to)
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static int ext4_ordered_write_end(struct file *file,
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struct address_space *mapping,
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loff_t pos, unsigned len, unsigned copied,
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struct page *page, void *fsdata)
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{
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handle_t *handle = ext4_journal_current_handle();
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struct inode *inode = page->mapping->host;
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struct inode *inode = file->f_mapping->host;
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unsigned from, to;
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int ret = 0, ret2;
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from = pos & (PAGE_CACHE_SIZE - 1);
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to = from + len;
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ret = walk_page_buffers(handle, page_buffers(page),
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from, to, NULL, ext4_journal_dirty_data);
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if (ret == 0) {
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/*
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* generic_commit_write() will run mark_inode_dirty() if i_size
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* generic_write_end() will run mark_inode_dirty() if i_size
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* changes. So let's piggyback the i_disksize mark_inode_dirty
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* into that.
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*/
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loff_t new_i_size;
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new_i_size = ((loff_t)page->index << PAGE_CACHE_SHIFT) + to;
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new_i_size = pos + copied;
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if (new_i_size > EXT4_I(inode)->i_disksize)
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EXT4_I(inode)->i_disksize = new_i_size;
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ret = generic_commit_write(file, page, from, to);
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copied = ext4_generic_write_end(file, mapping, pos, len, copied,
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page, fsdata);
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if (copied < 0)
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ret = copied;
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}
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ret2 = ext4_journal_stop(handle);
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if (!ret)
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ret = ret2;
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return ret;
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unlock_page(page);
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page_cache_release(page);
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return ret ? ret : copied;
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}
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static int ext4_writeback_commit_write(struct file *file, struct page *page,
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unsigned from, unsigned to)
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static int ext4_writeback_write_end(struct file *file,
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struct address_space *mapping,
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loff_t pos, unsigned len, unsigned copied,
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struct page *page, void *fsdata)
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{
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handle_t *handle = ext4_journal_current_handle();
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struct inode *inode = page->mapping->host;
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struct inode *inode = file->f_mapping->host;
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int ret = 0, ret2;
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loff_t new_i_size;
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new_i_size = ((loff_t)page->index << PAGE_CACHE_SHIFT) + to;
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new_i_size = pos + copied;
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if (new_i_size > EXT4_I(inode)->i_disksize)
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EXT4_I(inode)->i_disksize = new_i_size;
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if (test_opt(inode->i_sb, NOBH) && ext4_should_writeback_data(inode))
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ret = nobh_commit_write(file, page, from, to);
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else
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ret = generic_commit_write(file, page, from, to);
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copied = ext4_generic_write_end(file, mapping, pos, len, copied,
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page, fsdata);
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if (copied < 0)
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ret = copied;
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ret2 = ext4_journal_stop(handle);
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if (!ret)
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ret = ret2;
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return ret;
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unlock_page(page);
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page_cache_release(page);
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return ret ? ret : copied;
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}
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static int ext4_journalled_commit_write(struct file *file,
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struct page *page, unsigned from, unsigned to)
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static int ext4_journalled_write_end(struct file *file,
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struct address_space *mapping,
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loff_t pos, unsigned len, unsigned copied,
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struct page *page, void *fsdata)
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{
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handle_t *handle = ext4_journal_current_handle();
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struct inode *inode = page->mapping->host;
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struct inode *inode = mapping->host;
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int ret = 0, ret2;
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int partial = 0;
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loff_t pos;
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unsigned from, to;
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/*
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* Here we duplicate the generic_commit_write() functionality
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*/
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pos = ((loff_t)page->index << PAGE_CACHE_SHIFT) + to;
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from = pos & (PAGE_CACHE_SIZE - 1);
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to = from + len;
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if (copied < len) {
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if (!PageUptodate(page))
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copied = 0;
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page_zero_new_buffers(page, from+copied, to);
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}
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ret = walk_page_buffers(handle, page_buffers(page), from,
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to, &partial, commit_write_fn);
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to, &partial, write_end_fn);
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if (!partial)
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SetPageUptodate(page);
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if (pos > inode->i_size)
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i_size_write(inode, pos);
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if (pos+copied > inode->i_size)
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i_size_write(inode, pos+copied);
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EXT4_I(inode)->i_state |= EXT4_STATE_JDATA;
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if (inode->i_size > EXT4_I(inode)->i_disksize) {
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EXT4_I(inode)->i_disksize = inode->i_size;
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@ -1284,10 +1346,14 @@ static int ext4_journalled_commit_write(struct file *file,
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if (!ret)
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ret = ret2;
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}
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ret2 = ext4_journal_stop(handle);
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if (!ret)
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ret = ret2;
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return ret;
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unlock_page(page);
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page_cache_release(page);
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return ret ? ret : copied;
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}
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/*
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@ -1545,7 +1611,7 @@ static int ext4_journalled_writepage(struct page *page,
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PAGE_CACHE_SIZE, NULL, do_journal_get_write_access);
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err = walk_page_buffers(handle, page_buffers(page), 0,
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PAGE_CACHE_SIZE, NULL, commit_write_fn);
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PAGE_CACHE_SIZE, NULL, write_end_fn);
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if (ret == 0)
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ret = err;
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EXT4_I(inode)->i_state |= EXT4_STATE_JDATA;
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@ -1705,8 +1771,8 @@ static const struct address_space_operations ext4_ordered_aops = {
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.readpages = ext4_readpages,
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.writepage = ext4_ordered_writepage,
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.sync_page = block_sync_page,
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.prepare_write = ext4_prepare_write,
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.commit_write = ext4_ordered_commit_write,
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.write_begin = ext4_write_begin,
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.write_end = ext4_ordered_write_end,
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.bmap = ext4_bmap,
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.invalidatepage = ext4_invalidatepage,
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.releasepage = ext4_releasepage,
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@ -1719,8 +1785,8 @@ static const struct address_space_operations ext4_writeback_aops = {
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.readpages = ext4_readpages,
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.writepage = ext4_writeback_writepage,
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.sync_page = block_sync_page,
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.prepare_write = ext4_prepare_write,
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.commit_write = ext4_writeback_commit_write,
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.write_begin = ext4_write_begin,
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.write_end = ext4_writeback_write_end,
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.bmap = ext4_bmap,
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.invalidatepage = ext4_invalidatepage,
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.releasepage = ext4_releasepage,
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@ -1733,8 +1799,8 @@ static const struct address_space_operations ext4_journalled_aops = {
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.readpages = ext4_readpages,
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.writepage = ext4_journalled_writepage,
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.sync_page = block_sync_page,
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.prepare_write = ext4_prepare_write,
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.commit_write = ext4_journalled_commit_write,
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.write_begin = ext4_write_begin,
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.write_end = ext4_journalled_write_end,
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.set_page_dirty = ext4_journalled_set_page_dirty,
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.bmap = ext4_bmap,
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.invalidatepage = ext4_invalidatepage,
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