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Commit e153aa79 authored by Darrick J. Wong's avatar Darrick J. Wong
Browse files

xfs: set a default CoW extent size of 32 blocks 



If the admin doesn't set a CoW extent size or a regular extent size
hint, default to creating CoW reservations 32 blocks long to reduce
fragmentation.

Signed-off-by: default avatarDarricK J. Wong <darrick.wong@oracle.com>
Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
parent 3f165b33

fs/xfs/xfs_inode.c

+6 −4
Original line number Diff line number Diff line
@@ -80,7 +80,8 @@ xfs_get_extsz_hint( 
/*

 * Helper function to extract CoW extent size hint from inode.

 * Between the extent size hint and the CoW extent size hint, we

 * return the greater of the two.

 * return the greater of the two.  If the value is zero (automatic),

 * use the default size.

 */

xfs_extlen_t

xfs_get_cowextsz_hint(
@@ -93,9 +94,10 @@ xfs_get_cowextsz_hint( 
		a = ip->i_d.di_cowextsize;

	b = xfs_get_extsz_hint(ip);



	if (a > b)

	a = max(a, b);

	if (a == 0)

		return XFS_DEFAULT_COWEXTSZ_HINT;

	return a;

	return b;

}



/*

fs/xfs/xfs_inode.h

+3 −0
Original line number Diff line number Diff line
@@ -490,4 +490,7 @@ do { \ 


extern struct kmem_zone	*xfs_inode_zone;



/* The default CoW extent size hint. */

#define XFS_DEFAULT_COWEXTSZ_HINT 32



#endif	/* __XFS_INODE_H__ */