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Commit 3ad22c62 authored by Maxim Patlasov's avatar Maxim Patlasov Committed by Miklos Szeredi
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fuse: clear FUSE_I_CTIME_DIRTY flag on setattr 



The patch addresses two use-cases when the flag may be safely cleared:

1. fuse_do_setattr() is called with ATTR_CTIME flag set in attr->ia_valid.
In this case attr->ia_ctime bears actual value. In-kernel fuse must send it
to the userspace server and then assign the value to inode->i_ctime.

2. fuse_do_setattr() is called with ATTR_SIZE flag set in attr->ia_valid,
whereas ATTR_CTIME is not set (truncate(2)).
In this case in-kernel fuse must sent "now" to the userspace server and then
assign the value to inode->i_ctime.

In both cases we could clear I_DIRTY_SYNC, but that needs more thought.

Signed-off-by: default avatarMaxim Patlasov <MPatlasov@parallels.com>
Signed-off-by: default avatarMiklos Szeredi <mszeredi@suse.cz>
parent 31f3267b

fs/fuse/dir.c

+17 −9
Original line number Diff line number Diff line
@@ -1518,7 +1518,7 @@ static bool update_mtime(unsigned ivalid, bool trust_local_mtime) 
}



static void iattr_to_fattr(struct iattr *iattr, struct fuse_setattr_in *arg,

			   bool trust_local_mtime)

			   bool trust_local_cmtime)

{

	unsigned ivalid = iattr->ia_valid;
@@ -1537,13 +1537,18 @@ static void iattr_to_fattr(struct iattr *iattr, struct fuse_setattr_in *arg, 
		if (!(ivalid & ATTR_ATIME_SET))

			arg->valid |= FATTR_ATIME_NOW;

	}

	if ((ivalid & ATTR_MTIME) && update_mtime(ivalid, trust_local_mtime)) {

	if ((ivalid & ATTR_MTIME) && update_mtime(ivalid, trust_local_cmtime)) {

		arg->valid |= FATTR_MTIME;

		arg->mtime = iattr->ia_mtime.tv_sec;

		arg->mtimensec = iattr->ia_mtime.tv_nsec;

		if (!(ivalid & ATTR_MTIME_SET) && !trust_local_mtime)

		if (!(ivalid & ATTR_MTIME_SET) && !trust_local_cmtime)

			arg->valid |= FATTR_MTIME_NOW;

	}

	if ((ivalid & ATTR_CTIME) && trust_local_cmtime) {

		arg->valid |= FATTR_CTIME;

		arg->ctime = iattr->ia_ctime.tv_sec;

		arg->ctimensec = iattr->ia_ctime.tv_nsec;

	}

}



/*
@@ -1666,7 +1671,7 @@ int fuse_do_setattr(struct inode *inode, struct iattr *attr, 
	bool is_wb = fc->writeback_cache;

	loff_t oldsize;

	int err;

	bool trust_local_mtime = is_wb && S_ISREG(inode->i_mode);

	bool trust_local_cmtime = is_wb && S_ISREG(inode->i_mode);



	if (!(fc->flags & FUSE_DEFAULT_PERMISSIONS))

		attr->ia_valid |= ATTR_FORCE;
@@ -1691,13 +1696,13 @@ int fuse_do_setattr(struct inode *inode, struct iattr *attr, 
	if (is_truncate) {

		fuse_set_nowrite(inode);

		set_bit(FUSE_I_SIZE_UNSTABLE, &fi->state);

		if (trust_local_mtime && attr->ia_size != inode->i_size)

			attr->ia_valid |= ATTR_MTIME;

		if (trust_local_cmtime && attr->ia_size != inode->i_size)

			attr->ia_valid |= ATTR_MTIME | ATTR_CTIME;

	}



	memset(&inarg, 0, sizeof(inarg));

	memset(&outarg, 0, sizeof(outarg));

	iattr_to_fattr(attr, &inarg, trust_local_mtime);

	iattr_to_fattr(attr, &inarg, trust_local_cmtime);

	if (file) {

		struct fuse_file *ff = file->private_data;

		inarg.valid |= FATTR_FH;
@@ -1726,8 +1731,11 @@ int fuse_do_setattr(struct inode *inode, struct iattr *attr, 


	spin_lock(&fc->lock);

	/* the kernel maintains i_mtime locally */

	if (trust_local_mtime && (attr->ia_valid & ATTR_MTIME)) {

	if (trust_local_cmtime) {

		if (attr->ia_valid & ATTR_MTIME)

			inode->i_mtime = attr->ia_mtime;

		if (attr->ia_valid & ATTR_CTIME)

			inode->i_ctime = attr->ia_ctime;

		/* FIXME: clear I_DIRTY_SYNC? */

	}