Commit a38ed483 authored by Eric Biggers's avatar Eric Biggers Committed by Jan Kara
Browse files

fs: pass only I_DIRTY_INODE flags to ->dirty_inode 

->dirty_inode is now only called when I_DIRTY_INODE (I_DIRTY_SYNC and/or
I_DIRTY_DATASYNC) is set.  However it may still be passed other dirty
flags at the same time, provided that these other flags happened to be
passed to __mark_inode_dirty() at the same time as I_DIRTY_INODE.

This doesn't make sense because there is no reason for filesystems to
care about these extra flags.  Nor are filesystems notified about all
updates to these other flags.

Therefore, mask the flags before passing them to ->dirty_inode.

Also properly document ->dirty_inode in vfs.rst.

Link: https://lore.kernel.org/r/20210112190253.64307-7-ebiggers@kernel.org


Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
Reviewed-by: default avatarJan Kara <jack@suse.cz>
Signed-off-by: default avatarEric Biggers <ebiggers@google.com>
Signed-off-by: default avatarJan Kara <jack@suse.cz>
parent e2728c56

Documentation/filesystems/vfs.rst

+4 −1
Original line number Diff line number Diff line
@@ -270,7 +270,10 @@ or bottom half). 
	->alloc_inode.



``dirty_inode``

	this method is called by the VFS to mark an inode dirty.

	this method is called by the VFS when an inode is marked dirty.

	This is specifically for the inode itself being marked dirty,

	not its data.  If the update needs to be persisted by fdatasync(),

	then I_DIRTY_DATASYNC will be set in the flags argument.



``write_inode``

	this method is called when the VFS needs to write an inode to

fs/fs-writeback.c

+1 −1
Original line number Diff line number Diff line
@@ -2259,7 +2259,7 @@ void __mark_inode_dirty(struct inode *inode, int flags) 
		trace_writeback_dirty_inode_start(inode, flags);



		if (sb->s_op->dirty_inode)

			sb->s_op->dirty_inode(inode, flags);

			sb->s_op->dirty_inode(inode, flags & I_DIRTY_INODE);



		trace_writeback_dirty_inode(inode, flags);