Re: [PATCH v3 01/17] Add helper functions xfs_attr_set_args and xfs_attr_remove_args

[Allison Henderson <allison.henderson@xxxxxxxxxx>]

On 11/28/2017 12:54 PM, Darrick J. Wong wrote:

> On Fri, Nov 17, 2017 at 11:21:29AM -0700, Allison Henderson wrote:
> > These sub-routines set or remove the attributes specified in
> > @args. We will use this later for setting parent pointers as a
> > deferred attribute operation.
> >
> > Signed-off-by: Allison Henderson<allison.henderson@xxxxxxxxxx>
> > ---
> >   fs/xfs/libxfs/xfs_attr.c | 335 ++++++++++++++++++++++++++++-------------------
> >   fs/xfs/libxfs/xfs_bmap.c |  55 ++++----
> >   fs/xfs/libxfs/xfs_bmap.h |   1 +
> >   fs/xfs/xfs_attr.h        |   2 +
> >   4 files changed, 236 insertions(+), 157 deletions(-)
> >
> > diff --git a/fs/xfs/libxfs/xfs_attr.c b/fs/xfs/libxfs/xfs_attr.c
> > index 6249c92..e5f2960 100644
> > --- a/fs/xfs/libxfs/xfs_attr.c
> > +++ b/fs/xfs/libxfs/xfs_attr.c
> > @@ -168,6 +168,195 @@ xfs_attr_get(
> >   }
> >   
> >   /*
> > + * Set the attribute specified in @args. In the case of the parent attribute
> > + * being set, we do not want to roll the transaction on shortform-to-leaf
> > + * conversion, as the attribute must be added in the same transaction as the
> > + * parent directory modifications. Hence @roll_trans needs to be set
> > + * appropriately to control whether the transaction is committed during this
> > + * function.
> We have sufficient space in the single transaction case to do both, right?
I will double check.  You mean modifying the directory and then setting 
the parent pointer?
> > + */
> > +int
> > +xfs_attr_set_args(
> > +	struct xfs_da_args	*args,
> > +	int			flags,
> > +	bool			roll_trans)
> > +{
> > +	struct xfs_inode	*dp = args->dp;
> > +	struct xfs_mount        *mp = dp->i_mount;
> > +	struct xfs_trans_res    tres;
> > +	int			rsvd = 0;
> > +	int			error = 0;
> > +	int			sf_size;
> > +

This is the code (below) I had referenced earlier that was folded in 
from xfs_set_first_parent in the last version of the set.
> > +	/*
> > +	 * New inodes setting the parent pointer attr will
> > +	 * not have an attribute fork yet. So set the attribute
> > +	 * fork appropriately
> > +	 */
> > +	if (XFS_IFORK_Q((args->dp)) == 0) {
> > +		sf_size = sizeof(struct xfs_attr_sf_hdr) +
> > +		     XFS_ATTR_SF_ENTSIZE_BYNAME(args->namelen, args->valuelen);
> > +		xfs_bmap_set_attrforkoff(args->dp, sf_size, NULL);
> > +		args->dp->i_afp = kmem_zone_zalloc(xfs_ifork_zone, KM_SLEEP);
> > +		args->dp->i_afp->if_flags = XFS_IFEXTENTS;
> > +	}
> > +
> > +	tres.tr_logres = M_RES(mp)->tr_attrsetm.tr_logres +
> > +			 M_RES(mp)->tr_attrsetrt.tr_logres * args->total;
> > +	tres.tr_logcount = XFS_ATTRSET_LOG_COUNT;
> > +	tres.tr_logflags = XFS_TRANS_PERM_LOG_RES;
> /me raises eyebrows about declaring our own tres here, though it came
> from the original code so I gues I can't complain too loudly.
>
> (Primarily because we use the transaction reservations to calculate the
> minimum log size, so I would think we'd want this one included in those
> calculations...)
I believe that is done in patch 10 right?  We add one more transaction 
to the create operation for the parent pointer?  Should this one count 
for another?
> > +	/*
> > +	 * Root fork attributes can use reserved data blocks for this
> > +	 * operation if necessary
> > +	 */
> > +	error = xfs_trans_alloc(mp, &tres, args->total, 0,
> > +				rsvd ? XFS_TRANS_RESERVE : 0, &args->trans);
> > +	if (error)
> > +		goto out;
> > +
> > +	error = xfs_trans_reserve_quota_nblks(args->trans, dp, args->total, 0,
> > +					      rsvd ? XFS_QMOPT_RES_REGBLKS |
> > +						     XFS_QMOPT_FORCE_RES :
> > +						     XFS_QMOPT_RES_REGBLKS);
> > +	if (error)
> > +		goto out;
> > +
> > +	xfs_trans_ijoin(args->trans, dp, 0);
> > +	/*
> > +	 * If the attribute list is non-existent or a shortform list,
> > +	 * upgrade it to a single-leaf-block attribute list.
> > +	 */
> > +	if (dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL ||
> > +	    (dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS &&
> > +	     dp->i_d.di_anextents == 0)) {
> > +
> > +		/*
> > +		 * Build initial attribute list (if required).
> > +		 */
> > +		if (dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS)
> > +			xfs_attr_shortform_create(args);
> > +
> > +		/*
> > +		 * Try to add the attr to the attribute list in the inode.
> > +		 */
> > +		error = xfs_attr_shortform_addname(args);
> > +		if (error != -ENOSPC) {
> > +			ASSERT(args->trans);
> > +			if (!error && (flags & ATTR_KERNOTIME) == 0)
> > +				xfs_trans_ichgtime(args->trans, dp,
> > +						   XFS_ICHGTIME_CHG);
> > +			goto out;
> > +		}
> > +
> > +		/*
> > +		 * It won't fit in the shortform, transform to a leaf block.
> > +		 * GROT: another possible req'mt for a double-split btree op.
> > +		 */
> > +		error = xfs_attr_shortform_to_leaf(args);
> > +		if (error)
> > +			goto out;
> > +		xfs_defer_ijoin(args->dfops, dp);
> > +		if (roll_trans) {
> > +			error = xfs_defer_finish(&args->trans, args->dfops);
> > +			if (error) {
> > +				args->trans = NULL;
> > +				goto out;
> > +			}
> > +
> > +			/*
> > +			 * Commit the leaf transformation.  We'll need another
> > +			 * (linked) transaction to add the new attribute to the
> > +			 * leaf.
> > +			 */
> > +			error = xfs_trans_roll_inode(&args->trans, dp);
> > +			if (error)
> > +				goto out;
> > +		}
> > +	}
> > +
> > +	if (xfs_bmap_one_block(dp, XFS_ATTR_FORK))
> > +		error = xfs_attr_leaf_addname(args);
> > +	else
> > +		error = xfs_attr_node_addname(args);
> > +	if (error)
> > +		goto out;
> > +
> > +	if ((flags & ATTR_KERNOTIME) == 0)
> > +		xfs_trans_ichgtime(args->trans, dp, XFS_ICHGTIME_CHG);
> > +
> > +	xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE);
> > +out:
> > +	return error;
> > +}
> > +
> > +/*
> > + * Remove the attribute specified in @args.
> > + */
> > +int
> > +xfs_attr_remove_args(
> > +	struct xfs_da_args      *args,
> > +	int			flags)
> > +{
> > +	struct xfs_inode	*dp = args->dp;
> > +	struct xfs_mount	*mp = dp->i_mount;
> > +	int			error;
> > +	int                     rsvd = 0;
> > +
> > +	/*
> > +	 * Root fork attributes can use reserved data blocks for this
> > +	 * operation if necessary
> > +	 */
> > +	if (flags & ATTR_ROOT)
> > +		rsvd = XFS_TRANS_RESERVE;
> Insert a blank line to separate these two...
>
> > +	error = xfs_trans_alloc(mp, &M_RES(mp)->tr_attrrm,
> > +		XFS_ATTRRM_SPACE_RES(mp), 0, rsvd, &args->trans);
> > +
> ...and remove this one since they're directly related.
ok, will do
> > +	if (error)
> > +		goto out;
> > +
> > +	/*
> > +	 * No need to make quota reservations here. We expect to release some
> > +	 * blocks not allocate in the common case.
> > +	 */
> > +	xfs_trans_ijoin(args->trans, dp, 0);
> > +
> > +	if (!xfs_inode_hasattr(dp)) {
> > +		error = -ENOATTR;
> > +	} else if (dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) {
> > +		ASSERT(dp->i_afp->if_flags & XFS_IFINLINE);
> > +		error = xfs_attr_shortform_remove(args);
> > +	} else if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) {
> > +		error = xfs_attr_leaf_removename(args);
> > +	} else {
> > +		error = xfs_attr_node_removename(args);
> > +	}
> > +
> > +	if (error)
> > +		goto out;
> > +
> > +	/*
> > +	 * If this is a synchronous mount, make sure that the
> > +	 * transaction goes to disk before returning to the user.
> > +	 */
> > +	if (mp->m_flags & XFS_MOUNT_WSYNC)
> > +		xfs_trans_set_sync(args->trans);
> > +
> > +	if ((flags & ATTR_KERNOTIME) == 0)
> > +		xfs_trans_ichgtime(args->trans, dp, XFS_ICHGTIME_CHG);
> > +
> > +	xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE);
> > +
> > +	return error;
> > +
> > +out:
> > +	if (args->trans)
> > +		xfs_trans_cancel(args->trans);
> > +
> > +	return error;
> > +}
> > +
> > +/*
> >    * Calculate how many blocks we need for the new attribute,
> >    */
> >   STATIC int
> > @@ -214,10 +403,9 @@ xfs_attr_set(
> >   	struct xfs_mount	*mp = dp->i_mount;
> >   	struct xfs_da_args	args;
> >   	struct xfs_defer_ops	dfops;
> > -	struct xfs_trans_res	tres;
> >   	xfs_fsblock_t		firstblock;
> >   	int			rsvd = (flags & ATTR_ROOT) != 0;
> > -	int			error, err2, local;
> > +	int			error, local;
> >   
> >   	XFS_STATS_INC(mp, xs_attr_set);
> >   
> > @@ -252,106 +440,11 @@ xfs_attr_set(
> >   			return error;
> >   	}
> >   
> > -	tres.tr_logres = M_RES(mp)->tr_attrsetm.tr_logres +
> > -			 M_RES(mp)->tr_attrsetrt.tr_logres * args.total;
> > -	tres.tr_logcount = XFS_ATTRSET_LOG_COUNT;
> > -	tres.tr_logflags = XFS_TRANS_PERM_LOG_RES;
> > -
> > -	/*
> > -	 * Root fork attributes can use reserved data blocks for this
> > -	 * operation if necessary
> > -	 */
> > -	error = xfs_trans_alloc(mp, &tres, args.total, 0,
> > -			rsvd ? XFS_TRANS_RESERVE : 0, &args.trans);
> > -	if (error)
> > -		return error;
> > -
> >   	xfs_ilock(dp, XFS_ILOCK_EXCL);
> > -	error = xfs_trans_reserve_quota_nblks(args.trans, dp, args.total, 0,
> > -				rsvd ? XFS_QMOPT_RES_REGBLKS | XFS_QMOPT_FORCE_RES :
> > -				       XFS_QMOPT_RES_REGBLKS);
> > -	if (error) {
> > -		xfs_iunlock(dp, XFS_ILOCK_EXCL);
> > -		xfs_trans_cancel(args.trans);
> > -		return error;
> > -	}
> > -
> > -	xfs_trans_ijoin(args.trans, dp, 0);
> > -
> > -	/*
> > -	 * If the attribute list is non-existent or a shortform list,
> > -	 * upgrade it to a single-leaf-block attribute list.
> > -	 */
> > -	if (dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL ||
> > -	    (dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS &&
> > -	     dp->i_d.di_anextents == 0)) {
> > -
> > -		/*
> > -		 * Build initial attribute list (if required).
> > -		 */
> > -		if (dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS)
> > -			xfs_attr_shortform_create(&args);
> > -
> > -		/*
> > -		 * Try to add the attr to the attribute list in
> > -		 * the inode.
> > -		 */
> > -		error = xfs_attr_shortform_addname(&args);
> > -		if (error != -ENOSPC) {
> > -			/*
> > -			 * Commit the shortform mods, and we're done.
> > -			 * NOTE: this is also the error path (EEXIST, etc).
> > -			 */
> > -			ASSERT(args.trans != NULL);
> > -
> > -			/*
> > -			 * If this is a synchronous mount, make sure that
> > -			 * the transaction goes to disk before returning
> > -			 * to the user.
> > -			 */
> > -			if (mp->m_flags & XFS_MOUNT_WSYNC)
> > -				xfs_trans_set_sync(args.trans);
> > -
> > -			if (!error && (flags & ATTR_KERNOTIME) == 0) {
> > -				xfs_trans_ichgtime(args.trans, dp,
> > -							XFS_ICHGTIME_CHG);
> > -			}
> > -			err2 = xfs_trans_commit(args.trans);
> > -			xfs_iunlock(dp, XFS_ILOCK_EXCL);
> > -
> > -			return error ? error : err2;
> > -		}
> > -
> > -		/*
> > -		 * It won't fit in the shortform, transform to a leaf block.
> > -		 * GROT: another possible req'mt for a double-split btree op.
> > -		 */
> > -		xfs_defer_init(args.dfops, args.firstblock);
> > -		error = xfs_attr_shortform_to_leaf(&args);
> > -		if (error)
> > -			goto out_defer_cancel;
> > -		xfs_defer_ijoin(args.dfops, dp);
> > -		error = xfs_defer_finish(&args.trans, args.dfops);
> > -		if (error)
> > -			goto out_defer_cancel;
> > -
> > -		/*
> > -		 * Commit the leaf transformation.  We'll need another (linked)
> > -		 * transaction to add the new attribute to the leaf.
> > -		 */
> > -
> > -		error = xfs_trans_roll_inode(&args.trans, dp);
> > -		if (error)
> > -			goto out;
> > -
> > -	}
> > -
> > -	if (xfs_bmap_one_block(dp, XFS_ATTR_FORK))
> > -		error = xfs_attr_leaf_addname(&args);
> > -	else
> > -		error = xfs_attr_node_addname(&args);
> > +	xfs_defer_init(args.dfops, args.firstblock);
> > +	error = xfs_attr_set_args(&args, flags, true);
> >   	if (error)
> > -		goto out;
> > +		goto out_defer_cancel;
> >   
> >   	/*
> >   	 * If this is a synchronous mount, make sure that the
> > @@ -360,9 +453,6 @@ xfs_attr_set(
> >   	if (mp->m_flags & XFS_MOUNT_WSYNC)
> >   		xfs_trans_set_sync(args.trans);
> >   
> > -	if ((flags & ATTR_KERNOTIME) == 0)
> > -		xfs_trans_ichgtime(args.trans, dp, XFS_ICHGTIME_CHG);
> > -
> >   	/*
> >   	 * Commit the last in the sequence of transactions.
> >   	 */
> > @@ -374,10 +464,6 @@ xfs_attr_set(
> >   
> >   out_defer_cancel:
> >   	xfs_defer_cancel(&dfops);
> > -	args.trans = NULL;
> > -out:
> > -	if (args.trans)
> > -		xfs_trans_cancel(args.trans);
> >   	xfs_iunlock(dp, XFS_ILOCK_EXCL);
> >   	return error;
> >   }
> > @@ -417,38 +503,18 @@ xfs_attr_remove(
> >   	 */
> >   	args.op_flags = XFS_DA_OP_OKNOENT;
> >   
> > -	error = xfs_qm_dqattach(dp, 0);
> > -	if (error)
> > -		return error;
> > -
> > -	/*
> > -	 * Root fork attributes can use reserved data blocks for this
> > -	 * operation if necessary
> > -	 */
> > -	error = xfs_trans_alloc(mp, &M_RES(mp)->tr_attrrm,
> > -			XFS_ATTRRM_SPACE_RES(mp), 0,
> > -			(flags & ATTR_ROOT) ? XFS_TRANS_RESERVE : 0,
> > -			&args.trans);
> > -	if (error)
> > -		return error;
> > -
> >   	xfs_ilock(dp, XFS_ILOCK_EXCL);
> >   	/*
> >   	 * No need to make quota reservations here. We expect to release some
> >   	 * blocks not allocate in the common case.
> >   	 */
> >   	xfs_trans_ijoin(args.trans, dp, 0);
> > +	xfs_defer_init(args.dfops, args.firstblock);
> > +	error = xfs_qm_dqattach_locked(dp, 0);
> > +	if (error)
> > +		return error;
> >   
> > -	if (!xfs_inode_hasattr(dp)) {
> > -		error = -ENOATTR;
> > -	} else if (dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) {
> > -		ASSERT(dp->i_afp->if_flags & XFS_IFINLINE);
> > -		error = xfs_attr_shortform_remove(&args);
> > -	} else if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) {
> > -		error = xfs_attr_leaf_removename(&args);
> > -	} else {
> > -		error = xfs_attr_node_removename(&args);
> > -	}
> > +	error = xfs_attr_remove_args(&args, flags);
> >   
> >   	if (error)
> >   		goto out;
> > @@ -460,9 +526,6 @@ xfs_attr_remove(
> >   	if (mp->m_flags & XFS_MOUNT_WSYNC)
> >   		xfs_trans_set_sync(args.trans);
> >   
> > -	if ((flags & ATTR_KERNOTIME) == 0)
> > -		xfs_trans_ichgtime(args.trans, dp, XFS_ICHGTIME_CHG);
> > -
> >   	/*
> >   	 * Commit the last in the sequence of transactions.
> >   	 */
> > @@ -473,6 +536,8 @@ xfs_attr_remove(
> >   	return error;
> >   
> >   out:
> > +	xfs_defer_cancel(&dfops);
> > +
> >   	if (args.trans)
> >   		xfs_trans_cancel(args.trans);
> >   	xfs_iunlock(dp, XFS_ILOCK_EXCL);
> > diff --git a/fs/xfs/libxfs/xfs_bmap.c b/fs/xfs/libxfs/xfs_bmap.c
> > index 8926379..7fa58fa 100644
> > --- a/fs/xfs/libxfs/xfs_bmap.c
> > +++ b/fs/xfs/libxfs/xfs_bmap.c
> > @@ -1066,6 +1066,37 @@ xfs_bmap_add_attrfork_local(
> >   	return -EFSCORRUPTED;
> >   }
> >   
> > +/* Set an inode attr fork off based on the format */
> > +int
> > +xfs_bmap_set_attrforkoff(
> > +	struct xfs_inode	*ip,
> > +	int			size,
> > +	int			*version)
> > +{
> > +	switch (ip->i_d.di_format) {
> > +	case XFS_DINODE_FMT_DEV:
> > +		ip->i_d.di_forkoff = roundup(sizeof(xfs_dev_t), 8) >> 3;
> > +		break;
> > +	case XFS_DINODE_FMT_UUID:
> > +		ip->i_d.di_forkoff = roundup(sizeof(uuid_t), 8) >> 3;
> > +		break;
> > +	case XFS_DINODE_FMT_LOCAL:
> > +	case XFS_DINODE_FMT_EXTENTS:
> > +	case XFS_DINODE_FMT_BTREE:
> > +		ip->i_d.di_forkoff = xfs_attr_shortform_bytesfit(ip, size);
> > +		if (!ip->i_d.di_forkoff)
> > +			ip->i_d.di_forkoff = xfs_default_attroffset(ip) >> 3;
> > +		else if ((ip->i_mount->m_flags & XFS_MOUNT_ATTR2) && version)
> > +			*version = 2;
> > +		break;
> > +	default:
> > +		ASSERT(0);
> > +		return -EINVAL;
> > +	}
> > +
> > +	return 0;
> > +}
> > +
> >   /*
> >    * Convert inode from non-attributed to attributed.
> >    * Must not be in a transaction, ip must not be locked.
> > @@ -1119,29 +1150,9 @@ xfs_bmap_add_attrfork(
> >   
> >   	xfs_trans_ijoin(tp, ip, 0);
> >   	xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
> > -
> > -	switch (ip->i_d.di_format) {
> > -	case XFS_DINODE_FMT_DEV:
> > -		ip->i_d.di_forkoff = roundup(sizeof(xfs_dev_t), 8) >> 3;
> > -		break;
> > -	case XFS_DINODE_FMT_UUID:
> > -		ip->i_d.di_forkoff = roundup(sizeof(uuid_t), 8) >> 3;
> > -		break;
> > -	case XFS_DINODE_FMT_LOCAL:
> > -	case XFS_DINODE_FMT_EXTENTS:
> > -	case XFS_DINODE_FMT_BTREE:
> > -		ip->i_d.di_forkoff = xfs_attr_shortform_bytesfit(ip, size);
> > -		if (!ip->i_d.di_forkoff)
> > -			ip->i_d.di_forkoff = xfs_default_attroffset(ip) >> 3;
> > -		else if (mp->m_flags & XFS_MOUNT_ATTR2)
> > -			version = 2;
> > -		break;
> > -	default:
> > -		ASSERT(0);
> > -		error = -EINVAL;
> > +	error = xfs_bmap_set_attrforkoff(ip, size, &version);
> > +	if (error)
> >   		goto trans_cancel;
> > -	}
> > -
> >   	ASSERT(ip->i_afp == NULL);
> >   	ip->i_afp = kmem_zone_zalloc(xfs_ifork_zone, KM_SLEEP);
> >   	ip->i_afp->if_flags = XFS_IFEXTENTS;
> > diff --git a/fs/xfs/libxfs/xfs_bmap.h b/fs/xfs/libxfs/xfs_bmap.h
> > index 502e0d8..5ca4a73 100644
> > --- a/fs/xfs/libxfs/xfs_bmap.h
> > +++ b/fs/xfs/libxfs/xfs_bmap.h
> > @@ -210,6 +210,7 @@ void	xfs_trim_extent(struct xfs_bmbt_irec *irec, xfs_fileoff_t bno,
> >   		xfs_filblks_t len);
> >   void	xfs_trim_extent_eof(struct xfs_bmbt_irec *, struct xfs_inode *);
> >   int	xfs_bmap_add_attrfork(struct xfs_inode *ip, int size, int rsvd);
> > +int	xfs_bmap_set_attrforkoff(struct xfs_inode *ip, int size, int *version);
> >   void	xfs_bmap_local_to_extents_empty(struct xfs_inode *ip, int whichfork);
> >   void	xfs_bmap_add_free(struct xfs_mount *mp, struct xfs_defer_ops *dfops,
> >   			  xfs_fsblock_t bno, xfs_filblks_t len,
> > diff --git a/fs/xfs/xfs_attr.h b/fs/xfs/xfs_attr.h
> > index 5d5a5e2..8542606 100644
> > --- a/fs/xfs/xfs_attr.h
> > +++ b/fs/xfs/xfs_attr.h
> > @@ -149,7 +149,9 @@ int xfs_attr_get(struct xfs_inode *ip, const unsigned char *name,
> >   		 unsigned char *value, int *valuelenp, int flags);
> >   int xfs_attr_set(struct xfs_inode *dp, const unsigned char *name,
> >   		 unsigned char *value, int valuelen, int flags);
> > +int xfs_attr_set_args(struct xfs_da_args *args, int flags, bool roll_trans);
> >   int xfs_attr_remove(struct xfs_inode *dp, const unsigned char *name, int flags);
> > +int xfs_attr_remove_args(struct xfs_da_args *args, int flags);
> libxfs functions should be declared in a libxfs header, not here.
Alrighty, will move.  Thx!
> --D
>
> >   int xfs_attr_list(struct xfs_inode *dp, char *buffer, int bufsize,
> >   		  int flags, struct attrlist_cursor_kern *cursor);
> >   
> > --
> > 2.7.4
> >
> > --
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