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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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20
fs/fs-writeback.c
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@ -1198,3 +1198,23 @@ int sync_inode(struct inode *inode, struct writeback_control *wbc)
return ret;
}
EXPORT_SYMBOL(sync_inode);
/**
* sync_inode - write an inode to disk
* @inode: the inode to sync
* @wait: wait for I/O to complete.
*
* Write an inode to disk and adjust it's dirty state after completion.
*
* Note: only writes the actual inode, no associated data or other metadata.
*/
int sync_inode_metadata(struct inode *inode, int wait)
{
struct writeback_control wbc = {
.sync_mode = wait ? WB_SYNC_ALL : WB_SYNC_NONE,
.nr_to_write = 0, /* metadata-only */
};
return sync_inode(inode, &wbc);
}
EXPORT_SYMBOL(sync_inode_metadata);