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fs: add sync_inode_metadata

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Add a new helper to write out the inode using the writeback code,
that is including the correct dirty bit and list manipulation.  A few
of filesystems already opencode this, and a lot of others should be
using it instead of using write_inode_now which also writes out the
data.

Signed-off-by: Christoph Hellwig <[email protected]>
Signed-off-by: Al Viro <[email protected]>
This commit is contained in:
Christoph Hellwig 2010-10-06 10:48:20 +02:00 • committed by Al Viro
commit c37650161a
10 changed files with 30 additions and 41 deletions
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6
fs/libfs.c
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@ -892,10 +892,6 @@ EXPORT_SYMBOL_GPL(generic_fh_to_parent);
*/
int generic_file_fsync(struct file *file, int datasync)
{
struct writeback_control wbc = {
.sync_mode = WB_SYNC_ALL,
.nr_to_write = 0, /* metadata-only; caller takes care of data */
};
struct inode *inode = file->f_mapping->host;
int err;
int ret;
@ -906,7 +902,7 @@ int generic_file_fsync(struct file *file, int datasync)
if (datasync && !(inode->i_state & I_DIRTY_DATASYNC))
return ret;
err = sync_inode(inode, &wbc);
err = sync_inode_metadata(inode, 1);
if (ret == 0)
ret = err;
return ret;