return ext4_handle_dirty_metadata(handle, NULL, bh);
}
-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)
+/*
+ * 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().
+ *
+ * ext4 never places buffers on inode->i_mapping->private_list. metadata
+ * buffers are managed internally.
+ */
+static int ext4_write_end(struct file *file,
+ struct address_space *mapping,
+ loff_t pos, unsigned len, unsigned copied,
+ struct page *page, void *fsdata)
{
- int i_size_changed = 0;
- struct inode *inode = mapping->host;
handle_t *handle = ext4_journal_current_handle();
+ struct inode *inode = mapping->host;
+ int ret = 0, ret2;
+ int i_size_changed = 0;
+
+ trace_ext4_write_end(inode, pos, len, copied);
+ if (ext4_test_inode_state(inode, EXT4_STATE_ORDERED_MODE)) {
+ ret = ext4_jbd2_file_inode(handle, inode);
+ if (ret) {
+ unlock_page(page);
+ page_cache_release(page);
+ goto errout;
+ }
+ }
if (ext4_has_inline_data(inode))
copied = ext4_write_inline_data_end(inode, pos, len,
/*
* No need to use i_size_read() here, the i_size
- * cannot change under us because we hold i_mutex.
+ * cannot change under us because we hole i_mutex.
*
* But it's important to update i_size while still holding page lock:
* page writeout could otherwise come in and zero beyond i_size.
i_size_changed = 1;
}
- if (pos + copied > EXT4_I(inode)->i_disksize) {
+ if (pos + copied > EXT4_I(inode)->i_disksize) {
/* We need to mark inode dirty even if
* new_i_size is less that inode->i_size
- * bu greater than i_disksize.(hint delalloc)
+ * but greater than i_disksize. (hint delalloc)
*/
ext4_update_i_disksize(inode, (pos + copied));
i_size_changed = 1;
if (i_size_changed)
ext4_mark_inode_dirty(handle, 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().
- *
- * ext4 never places buffers on inode->i_mapping->private_list. metadata
- * buffers are managed internally.
- */
-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 = mapping->host;
- int ret = 0, ret2;
-
- trace_ext4_ordered_write_end(inode, pos, len, copied);
- ret = ext4_jbd2_file_inode(handle, inode);
-
- if (ret == 0) {
- ret2 = ext4_generic_write_end(file, mapping, pos, len, copied,
- page, fsdata);
- copied = ret2;
- if (pos + len > inode->i_size && ext4_can_truncate(inode))
- /* if we have allocated more blocks and copied
- * less. We will have blocks allocated outside
- * inode->i_size. So truncate them
- */
- ext4_orphan_add(handle, inode);
- if (ret2 < 0)
- ret = ret2;
- } else {
- unlock_page(page);
- page_cache_release(page);
- }
-
- ret2 = ext4_journal_stop(handle);
- if (!ret)
- ret = ret2;
-
- if (pos + len > inode->i_size) {
- ext4_truncate_failed_write(inode);
- /*
- * If truncate failed early the inode might still be
- * on the orphan list; we need to make sure the inode
- * is removed from the orphan list in that case.
- */
- if (inode->i_nlink)
- ext4_orphan_del(NULL, inode);
- }
-
-
- return ret ? ret : copied;
-}
-
-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 = mapping->host;
- int ret = 0, ret2;
-
- trace_ext4_writeback_write_end(inode, pos, len, copied);
- ret2 = ext4_generic_write_end(file, mapping, pos, len, copied,
- page, fsdata);
- copied = ret2;
+ if (copied < 0)
+ ret = copied;
if (pos + len > inode->i_size && ext4_can_truncate(inode))
/* if we have allocated more blocks and copied
* less. We will have blocks allocated outside
* inode->i_size. So truncate them
*/
ext4_orphan_add(handle, inode);
-
- if (ret2 < 0)
- ret = ret2;
-
+errout:
ret2 = ext4_journal_stop(handle);
if (!ret)
ret = ret2;
unsigned long start, end;
int write_mode = (int)(unsigned long)fsdata;
- if (write_mode == FALL_BACK_TO_NONDELALLOC) {
- switch (ext4_inode_journal_mode(inode)) {
- case EXT4_INODE_ORDERED_DATA_MODE:
- return ext4_ordered_write_end(file, mapping, pos,
- len, copied, page, fsdata);
- case EXT4_INODE_WRITEBACK_DATA_MODE:
- return ext4_writeback_write_end(file, mapping, pos,
- len, copied, page, fsdata);
- default:
- BUG();
- }
- }
+ if (write_mode == FALL_BACK_TO_NONDELALLOC)
+ return ext4_write_end(file, mapping, pos,
+ len, copied, page, fsdata);
trace_ext4_da_write_end(inode, pos, len, copied);
start = pos & (PAGE_CACHE_SIZE - 1);
return __set_page_dirty_nobuffers(page);
}
-static const struct address_space_operations ext4_ordered_aops = {
+static const struct address_space_operations ext4_aops = {
.readpage = ext4_readpage,
.readpages = ext4_readpages,
.writepage = ext4_writepage,
.write_begin = ext4_write_begin,
- .write_end = ext4_ordered_write_end,
- .bmap = ext4_bmap,
- .invalidatepage = ext4_invalidatepage,
- .releasepage = ext4_releasepage,
- .direct_IO = ext4_direct_IO,
- .migratepage = buffer_migrate_page,
- .is_partially_uptodate = block_is_partially_uptodate,
- .error_remove_page = generic_error_remove_page,
-};
-
-static const struct address_space_operations ext4_writeback_aops = {
- .readpage = ext4_readpage,
- .readpages = ext4_readpages,
- .writepage = ext4_writepage,
- .write_begin = ext4_write_begin,
- .write_end = ext4_writeback_write_end,
+ .write_end = ext4_write_end,
.bmap = ext4_bmap,
.invalidatepage = ext4_invalidatepage,
.releasepage = ext4_releasepage,
{
switch (ext4_inode_journal_mode(inode)) {
case EXT4_INODE_ORDERED_DATA_MODE:
- if (test_opt(inode->i_sb, DELALLOC))
- inode->i_mapping->a_ops = &ext4_da_aops;
- else
- inode->i_mapping->a_ops = &ext4_ordered_aops;
+ ext4_set_inode_state(inode, EXT4_STATE_ORDERED_MODE);
break;
case EXT4_INODE_WRITEBACK_DATA_MODE:
- if (test_opt(inode->i_sb, DELALLOC))
- inode->i_mapping->a_ops = &ext4_da_aops;
- else
- inode->i_mapping->a_ops = &ext4_writeback_aops;
+ ext4_clear_inode_state(inode, EXT4_STATE_ORDERED_MODE);
break;
case EXT4_INODE_JOURNAL_DATA_MODE:
inode->i_mapping->a_ops = &ext4_journalled_aops;
- break;
+ return;
default:
BUG();
}
+ if (test_opt(inode->i_sb, DELALLOC))
+ inode->i_mapping->a_ops = &ext4_da_aops;
+ else
+ inode->i_mapping->a_ops = &ext4_aops;
}
int ext4_punch_hole(struct file *file, loff_t offset, loff_t length)
{
struct inode *inode = file_inode(file);
+ struct super_block *sb = inode->i_sb;
+ ext4_lblk_t first_block, stop_block;
+ struct address_space *mapping = inode->i_mapping;
+ loff_t first_page, last_page, page_len;
+ loff_t first_page_offset, last_page_offset;
+ handle_t *handle;
+ unsigned int credits;
+ int ret = 0;
+
if (!S_ISREG(inode->i_mode))
return -EOPNOTSUPP;
- if (!ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))
- return ext4_ind_punch_hole(file, offset, length);
-
- if (EXT4_SB(inode->i_sb)->s_cluster_ratio > 1) {
+ if (EXT4_SB(sb)->s_cluster_ratio > 1) {
/* TODO: Add support for bigalloc file systems */
return -EOPNOTSUPP;
}
trace_ext4_punch_hole(inode, offset, length);
- return ext4_ext_punch_hole(file, offset, length);
+ /*
+ * Write out all dirty pages to avoid race conditions
+ * Then release them.
+ */
+ if (mapping->nrpages && mapping_tagged(mapping, PAGECACHE_TAG_DIRTY)) {
+ ret = filemap_write_and_wait_range(mapping, offset,
+ offset + length - 1);
+ if (ret)
+ return ret;
+ }
+
+ mutex_lock(&inode->i_mutex);
+ /* It's not possible punch hole on append only file */
+ if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) {
+ ret = -EPERM;
+ goto out_mutex;
+ }
+ if (IS_SWAPFILE(inode)) {
+ ret = -ETXTBSY;
+ goto out_mutex;
+ }
+
+ /* No need to punch hole beyond i_size */
+ if (offset >= inode->i_size)
+ goto out_mutex;
+
+ /*
+ * If the hole extends beyond i_size, set the hole
+ * to end after the page that contains i_size
+ */
+ if (offset + length > inode->i_size) {
+ length = inode->i_size +
+ PAGE_CACHE_SIZE - (inode->i_size & (PAGE_CACHE_SIZE - 1)) -
+ offset;
+ }
+
+ first_page = (offset + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
+ last_page = (offset + length) >> PAGE_CACHE_SHIFT;
+
+ first_page_offset = first_page << PAGE_CACHE_SHIFT;
+ last_page_offset = last_page << PAGE_CACHE_SHIFT;
+
+ /* Now release the pages */
+ if (last_page_offset > first_page_offset) {
+ truncate_pagecache_range(inode, first_page_offset,
+ last_page_offset - 1);
+ }
+
+ /* Wait all existing dio workers, newcomers will block on i_mutex */
+ ext4_inode_block_unlocked_dio(inode);
+ ret = ext4_flush_unwritten_io(inode);
+ if (ret)
+ goto out_dio;
+ inode_dio_wait(inode);
+
+ if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))
+ credits = ext4_writepage_trans_blocks(inode);
+ else
+ credits = ext4_blocks_for_truncate(inode);
+ handle = ext4_journal_start(inode, EXT4_HT_TRUNCATE, credits);
+ if (IS_ERR(handle)) {
+ ret = PTR_ERR(handle);
+ ext4_std_error(sb, ret);
+ goto out_dio;
+ }
+
+ /*
+ * Now we need to zero out the non-page-aligned data in the
+ * pages at the start and tail of the hole, and unmap the
+ * buffer heads for the block aligned regions of the page that
+ * were completely zeroed.
+ */
+ if (first_page > last_page) {
+ /*
+ * If the file space being truncated is contained
+ * within a page just zero out and unmap the middle of
+ * that page
+ */
+ ret = ext4_discard_partial_page_buffers(handle,
+ mapping, offset, length, 0);
+
+ if (ret)
+ goto out_stop;
+ } else {
+ /*
+ * zero out and unmap the partial page that contains
+ * the start of the hole
+ */
+ page_len = first_page_offset - offset;
+ if (page_len > 0) {
+ ret = ext4_discard_partial_page_buffers(handle, mapping,
+ offset, page_len, 0);
+ if (ret)
+ goto out_stop;
+ }
+
+ /*
+ * zero out and unmap the partial page that contains
+ * the end of the hole
+ */
+ page_len = offset + length - last_page_offset;
+ if (page_len > 0) {
+ ret = ext4_discard_partial_page_buffers(handle, mapping,
+ last_page_offset, page_len, 0);
+ if (ret)
+ goto out_stop;
+ }
+ }
+
+ /*
+ * If i_size is contained in the last page, we need to
+ * unmap and zero the partial page after i_size
+ */
+ if (inode->i_size >> PAGE_CACHE_SHIFT == last_page &&
+ inode->i_size % PAGE_CACHE_SIZE != 0) {
+ page_len = PAGE_CACHE_SIZE -
+ (inode->i_size & (PAGE_CACHE_SIZE - 1));
+
+ if (page_len > 0) {
+ ret = ext4_discard_partial_page_buffers(handle,
+ mapping, inode->i_size, page_len, 0);
+
+ if (ret)
+ goto out_stop;
+ }
+ }
+
+ first_block = (offset + sb->s_blocksize - 1) >>
+ EXT4_BLOCK_SIZE_BITS(sb);
+ stop_block = (offset + length) >> EXT4_BLOCK_SIZE_BITS(sb);
+
+ /* If there are no blocks to remove, return now */
+ if (first_block >= stop_block)
+ goto out_stop;
+
+ down_write(&EXT4_I(inode)->i_data_sem);
+ ext4_discard_preallocations(inode);
+
+ ret = ext4_es_remove_extent(inode, first_block,
+ stop_block - first_block);
+ if (ret) {
+ up_write(&EXT4_I(inode)->i_data_sem);
+ goto out_stop;
+ }
+
+ if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))
+ ret = ext4_ext_remove_space(inode, first_block,
+ stop_block - 1);
+ else
+ ret = ext4_free_hole_blocks(handle, inode, first_block,
+ stop_block);
+
+ ext4_discard_preallocations(inode);
+ up_write(&EXT4_I(inode)->i_data_sem);
+ if (IS_SYNC(inode))
+ ext4_handle_sync(handle);
+ inode->i_mtime = inode->i_ctime = ext4_current_time(inode);
+ ext4_mark_inode_dirty(handle, inode);
+out_stop:
+ ext4_journal_stop(handle);
+out_dio:
+ ext4_inode_resume_unlocked_dio(inode);
+out_mutex:
+ mutex_unlock(&inode->i_mutex);
+ return ret;
}
/*
*/
void ext4_truncate(struct inode *inode)
{
+ struct ext4_inode_info *ei = EXT4_I(inode);
+ unsigned int credits;
+ handle_t *handle;
+ struct address_space *mapping = inode->i_mapping;
+ loff_t page_len;
+
+ /*
+ * There is a possibility that we're either freeing the inode
+ * or it completely new indode. In those cases we might not
+ * have i_mutex locked because it's not necessary.
+ */
+ if (!(inode->i_state & (I_NEW|I_FREEING)))
+ WARN_ON(!mutex_is_locked(&inode->i_mutex));
trace_ext4_truncate_enter(inode);
if (!ext4_can_truncate(inode))
return;
}
+ /*
+ * finish any pending end_io work so we won't run the risk of
+ * converting any truncated blocks to initialized later
+ */
+ ext4_flush_unwritten_io(inode);
+
if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))
- ext4_ext_truncate(inode);
+ credits = ext4_writepage_trans_blocks(inode);
else
- ext4_ind_truncate(inode);
+ credits = ext4_blocks_for_truncate(inode);
+
+ handle = ext4_journal_start(inode, EXT4_HT_TRUNCATE, credits);
+ if (IS_ERR(handle)) {
+ ext4_std_error(inode->i_sb, PTR_ERR(handle));
+ return;
+ }
+
+ if (inode->i_size % PAGE_CACHE_SIZE != 0) {
+ page_len = PAGE_CACHE_SIZE -
+ (inode->i_size & (PAGE_CACHE_SIZE - 1));
+
+ if (ext4_discard_partial_page_buffers(handle,
+ mapping, inode->i_size, page_len, 0))
+ goto out_stop;
+ }
+
+ /*
+ * We add the inode to the orphan list, so that if this
+ * truncate spans multiple transactions, and we crash, we will
+ * resume the truncate when the filesystem recovers. It also
+ * marks the inode dirty, to catch the new size.
+ *
+ * Implication: the file must always be in a sane, consistent
+ * truncatable state while each transaction commits.
+ */
+ if (ext4_orphan_add(handle, inode))
+ goto out_stop;
+
+ down_write(&EXT4_I(inode)->i_data_sem);
+
+ ext4_discard_preallocations(inode);
+
+ if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))
+ ext4_ext_truncate(handle, inode);
+ else
+ ext4_ind_truncate(handle, inode);
+
+ up_write(&ei->i_data_sem);
+
+ if (IS_SYNC(inode))
+ ext4_handle_sync(handle);
+
+out_stop:
+ /*
+ * If this was a simple ftruncate() and the file will remain alive,
+ * then we need to clear up the orphan record which we created above.
+ * However, if this was a real unlink then we were called by
+ * ext4_delete_inode(), and we allow that function to clean up the
+ * orphan info for us.
+ */
+ if (inode->i_nlink)
+ ext4_orphan_del(handle, inode);
+
+ inode->i_mtime = inode->i_ctime = ext4_current_time(inode);
+ ext4_mark_inode_dirty(handle, inode);
+ ext4_journal_stop(handle);
trace_ext4_truncate_exit(inode);
}
projects / ~andy / linux / blobdiff