[PATCH v5 0/6] xfs: some xfs_dialloc() cleanup

[PATCH v5 0/6] xfs: some xfs_dialloc() cleanup

[Gao Xiang]

Hi folks,

This is v4 of the following patchset
https://lore.kernel.org/r/20201124155130.40848-1-hsiangkao@redhat.com
, which tends to simplify xfs_dialloc() logic.

This version includes Dave's original patch
https://lore.kernel.org/r/20201124221623.GC2842436@dread.disaster.area

to avoid the original double call of xfs_dialloc() and confusing
ialloc_context with some split in order for better review and minor
modification (e.g. ino isn't passed in xfs_ialloc()).

I'm not quite sure what's messy ENOSPC mentioned in the original
patch since return 0 and *ipp = NULL in xfs_dir_ialloc() would cause
NULL-dereference in its callers, so I leave this part alone, although
I think noroom has no use at all (it can be cleaned up as well with
a following patch) (at a glance, the final shape looks almost ok...)

I dropped [PATCH v1 3/3] since xfs_ialloc_select_ag() already looks
simple enough (comments about this are welcome... I can re-add this
if needed.)

I'm re-runing xfstests -g auto with the whole series for now since
a bit left behind this time, hopefully no extra issues here. I've
dropped all RVBs from "[PATCH v4 3/6]" since some more modification
here...

Thanks for your time.

changes since v4:
 - collect RVBs from v4;
 - (3/6) get rid of an unnecessary comment (Christoph);

changes since v3 (Christoph):
 - (2/6) get rid of a brace;
 - (2/6) keeping xfs_buf_relse() in the callers;
 - (2/6) get rid of "XXX:" comment;
 - (3/6) rename xfs_ialloc() to xfs_init_new_inode();
 - (3/6) rename pino to parent_ino;
 - (3/6) convert the return type from int to struct xfs_inode *
         (so I dropped all RVBs of this patch, since more modification
          here....)
 - (4/6) refine a comment;
 - (5/6) add a found_ag lebel to have a central place for the
         sucessful return, since there are somewhat too many labels here,
         I didn't add another error lebel to make *IO_agbp = NULL and
         return error;
 - (6/6) drop the else after the break.

changes since v2:
 - use struct xfs_dquot_acct * instead of void * on dqinfo (Darrick);
 - rename xfs_ialloc() to xfs_dir_ialloc_init() (Dave);
 - fix a temporary state compile error due to (ialloc_context ->
   &ialloc_context) on [PATCH v2 3/6];
 - collect more RVBs from the reply of v2;
 - Cc Eric to confirm dqinfo;

changes since v1:
 - add Dave's patch with spilt and minor update;
 - update comments above xfs_ialloc_ag_alloc() suggested by Darrick;
 - collect RVBs to
    "xfs: convert noroom, okalloc in xfs_dialloc() to bool"
    "xfs: kill ialloced in xfs_dialloc()"
   since no real logic changes ("(!error)" to "(error==0)" suggested
   by Darrick has been updated).

Thanks,
Gao Xiang

Dave Chinner (4):
  xfs: introduce xfs_dialloc_roll()
  xfs: move on-disk inode allocation out of xfs_ialloc()
  xfs: move xfs_dialloc_roll() into xfs_dialloc()
  xfs: spilt xfs_dialloc() into 2 functions

Gao Xiang (2):
  xfs: convert noroom, okalloc in xfs_dialloc() to bool
  xfs: kill ialloced in xfs_dialloc()

 fs/xfs/libxfs/xfs_ialloc.c | 174 +++++++++++++------------
 fs/xfs/libxfs/xfs_ialloc.h |  36 +++---
 fs/xfs/xfs_inode.c         | 258 +++++++++----------------------------
 fs/xfs/xfs_inode.h         |   6 +-
 fs/xfs/xfs_qm.c            |  27 ++--
 fs/xfs/xfs_symlink.c       |   8 +-
 6 files changed, 196 insertions(+), 313 deletions(-)

-- 
2.27.0

[PATCH v5 1/6] xfs: convert noroom, okalloc in xfs_dialloc() to bool

[Gao Xiang]

Boolean is preferred for such use.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Gao Xiang <hsiangkao@redhat.com>
---
 fs/xfs/libxfs/xfs_ialloc.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/fs/xfs/libxfs/xfs_ialloc.c b/fs/xfs/libxfs/xfs_ialloc.c
index 974e71bc4a3a..45cf7e55f5ee 100644
--- a/fs/xfs/libxfs/xfs_ialloc.c
+++ b/fs/xfs/libxfs/xfs_ialloc.c
@@ -1716,11 +1716,11 @@ xfs_dialloc(
 	xfs_agnumber_t		agno;
 	int			error;
 	int			ialloced;
-	int			noroom = 0;
+	bool			noroom = false;
 	xfs_agnumber_t		start_agno;
 	struct xfs_perag	*pag;
 	struct xfs_ino_geometry	*igeo = M_IGEO(mp);
-	int			okalloc = 1;
+	bool			okalloc = true;
 
 	if (*IO_agbp) {
 		/*
@@ -1753,8 +1753,8 @@ xfs_dialloc(
 	if (igeo->maxicount &&
 	    percpu_counter_read_positive(&mp->m_icount) + igeo->ialloc_inos
 							> igeo->maxicount) {
-		noroom = 1;
-		okalloc = 0;
+		noroom = true;
+		okalloc = false;
 	}
 
 	/*
-- 
2.27.0

[PATCH v5 2/6] xfs: introduce xfs_dialloc_roll()

[Gao Xiang]

From: Dave Chinner <dchinner@redhat.com>

Introduce a helper to make the on-disk inode allocation rolling
logic clearer in preparation of the following cleanup.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Gao Xiang <hsiangkao@redhat.com>
---
 fs/xfs/libxfs/xfs_ialloc.c | 43 ++++++++++++++++++++++++++++++++++++++
 fs/xfs/libxfs/xfs_ialloc.h |  5 +++++
 fs/xfs/xfs_inode.c         | 37 +-------------------------------
 3 files changed, 49 insertions(+), 36 deletions(-)

diff --git a/fs/xfs/libxfs/xfs_ialloc.c b/fs/xfs/libxfs/xfs_ialloc.c
index 45cf7e55f5ee..23e94d43acb2 100644
--- a/fs/xfs/libxfs/xfs_ialloc.c
+++ b/fs/xfs/libxfs/xfs_ialloc.c
@@ -1682,6 +1682,49 @@ xfs_dialloc_ag(
 	return error;
 }
 
+int
+xfs_dialloc_roll(
+	struct xfs_trans	**tpp,
+	struct xfs_buf		*agibp)
+{
+	struct xfs_trans	*tp = *tpp;
+	struct xfs_dquot_acct	*dqinfo = NULL;
+	unsigned int		tflags = 0;
+	int			error;
+
+	/*
+	 * Hold to on to the agibp across the commit so no other allocation can
+	 * come in and take the free inodes we just allocated for our caller.
+	 */
+	xfs_trans_bhold(tp, agibp);
+
+	/*
+	 * We want the quota changes to be associated with the next transaction,
+	 * NOT this one. So, detach the dqinfo from this and attach it to the
+	 * next transaction.
+	 */
+	if (tp->t_dqinfo) {
+		dqinfo = tp->t_dqinfo;
+		tp->t_dqinfo = NULL;
+		tflags = tp->t_flags & XFS_TRANS_DQ_DIRTY;
+		tp->t_flags &= ~XFS_TRANS_DQ_DIRTY;
+	}
+
+	error = xfs_trans_roll(&tp);
+
+	/* Re-attach the quota info that we detached from prev trx. */
+	if (dqinfo) {
+		tp->t_dqinfo = dqinfo;
+		tp->t_flags |= tflags;
+	}
+
+	*tpp = tp;
+	if (error)
+		return error;
+	xfs_trans_bjoin(tp, agibp);
+	return 0;
+}
+
 /*
  * Allocate an inode on disk.
  *
diff --git a/fs/xfs/libxfs/xfs_ialloc.h b/fs/xfs/libxfs/xfs_ialloc.h
index 72b3468b97b1..bd6e0db9e23c 100644
--- a/fs/xfs/libxfs/xfs_ialloc.h
+++ b/fs/xfs/libxfs/xfs_ialloc.h
@@ -32,6 +32,11 @@ xfs_make_iptr(struct xfs_mount *mp, struct xfs_buf *b, int o)
 	return xfs_buf_offset(b, o << (mp)->m_sb.sb_inodelog);
 }
 
+int
+xfs_dialloc_roll(
+	struct xfs_trans	**tpp,
+	struct xfs_buf		*agibp);
+
 /*
  * Allocate an inode on disk.
  * Mode is used to tell whether the new inode will need space, and whether
diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
index 2bfbcf28b1bd..76282da7a05c 100644
--- a/fs/xfs/xfs_inode.c
+++ b/fs/xfs/xfs_inode.c
@@ -958,8 +958,6 @@ xfs_dir_ialloc(
 	xfs_inode_t	*ip;
 	xfs_buf_t	*ialloc_context = NULL;
 	int		code;
-	void		*dqinfo;
-	uint		tflags;
 
 	tp = *tpp;
 	ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES);
@@ -1003,46 +1001,13 @@ xfs_dir_ialloc(
 	 * to succeed the second time.
 	 */
 	if (ialloc_context) {
-		/*
-		 * Normally, xfs_trans_commit releases all the locks.
-		 * We call bhold to hang on to the ialloc_context across
-		 * the commit.  Holding this buffer prevents any other
-		 * processes from doing any allocations in this
-		 * allocation group.
-		 */
-		xfs_trans_bhold(tp, ialloc_context);
-
-		/*
-		 * We want the quota changes to be associated with the next
-		 * transaction, NOT this one. So, detach the dqinfo from this
-		 * and attach it to the next transaction.
-		 */
-		dqinfo = NULL;
-		tflags = 0;
-		if (tp->t_dqinfo) {
-			dqinfo = (void *)tp->t_dqinfo;
-			tp->t_dqinfo = NULL;
-			tflags = tp->t_flags & XFS_TRANS_DQ_DIRTY;
-			tp->t_flags &= ~(XFS_TRANS_DQ_DIRTY);
-		}
-
-		code = xfs_trans_roll(&tp);
-
-		/*
-		 * Re-attach the quota info that we detached from prev trx.
-		 */
-		if (dqinfo) {
-			tp->t_dqinfo = dqinfo;
-			tp->t_flags |= tflags;
-		}
-
+		code = xfs_dialloc_roll(&tp, ialloc_context);
 		if (code) {
 			xfs_buf_relse(ialloc_context);
 			*tpp = tp;
 			*ipp = NULL;
 			return code;
 		}
-		xfs_trans_bjoin(tp, ialloc_context);
 
 		/*
 		 * Call ialloc again. Since we've locked out all
-- 
2.27.0

[PATCH v5 3/6] xfs: move on-disk inode allocation out of xfs_ialloc()

[Gao Xiang]

From: Dave Chinner <dchinner@redhat.com>

So xfs_ialloc() will only address in-core inode allocation then,
Also, rename xfs_ialloc() to xfs_dir_ialloc_init() in order to
keep everything in xfs_inode.c under the same namespace.

Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Gao Xiang <hsiangkao@redhat.com>
---
 fs/xfs/xfs_inode.c   | 219 +++++++++++++++----------------------------
 fs/xfs/xfs_inode.h   |   6 +-
 fs/xfs/xfs_qm.c      |  27 +++---
 fs/xfs/xfs_symlink.c |   8 +-
 4 files changed, 97 insertions(+), 163 deletions(-)

diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
index 76282da7a05c..07d692020da3 100644
--- a/fs/xfs/xfs_inode.c
+++ b/fs/xfs/xfs_inode.c
@@ -761,68 +761,25 @@ xfs_inode_inherit_flags2(
 }
 
 /*
- * Allocate an inode on disk and return a copy of its in-core version.
- * The in-core inode is locked exclusively.  Set mode, nlink, and rdev
- * appropriately within the inode.  The uid and gid for the inode are
- * set according to the contents of the given cred structure.
- *
- * Use xfs_dialloc() to allocate the on-disk inode. If xfs_dialloc()
- * has a free inode available, call xfs_iget() to obtain the in-core
- * version of the allocated inode.  Finally, fill in the inode and
- * log its initial contents.  In this case, ialloc_context would be
- * set to NULL.
- *
- * If xfs_dialloc() does not have an available inode, it will replenish
- * its supply by doing an allocation. Since we can only do one
- * allocation within a transaction without deadlocks, we must commit
- * the current transaction before returning the inode itself.
- * In this case, therefore, we will set ialloc_context and return.
- * The caller should then commit the current transaction, start a new
- * transaction, and call xfs_ialloc() again to actually get the inode.
- *
- * To ensure that some other process does not grab the inode that
- * was allocated during the first call to xfs_ialloc(), this routine
- * also returns the [locked] bp pointing to the head of the freelist
- * as ialloc_context.  The caller should hold this buffer across
- * the commit and pass it back into this routine on the second call.
- *
- * If we are allocating quota inodes, we do not have a parent inode
- * to attach to or associate with (i.e. pip == NULL) because they
- * are not linked into the directory structure - they are attached
- * directly to the superblock - and so have no parent.
+ * Initialise a newly allocated inode and return the in-core inode to the
+ * caller locked exclusively.
  */
-static int
-xfs_ialloc(
-	xfs_trans_t	*tp,
-	xfs_inode_t	*pip,
-	umode_t		mode,
-	xfs_nlink_t	nlink,
-	dev_t		rdev,
-	prid_t		prid,
-	xfs_buf_t	**ialloc_context,
-	xfs_inode_t	**ipp)
+static struct xfs_inode *
+xfs_init_new_inode(
+	struct xfs_trans	*tp,
+	struct xfs_inode	*pip,
+	xfs_ino_t		ino,
+	umode_t			mode,
+	xfs_nlink_t		nlink,
+	dev_t			rdev,
+	prid_t			prid)
 {
-	struct xfs_mount *mp = tp->t_mountp;
-	xfs_ino_t	ino;
-	xfs_inode_t	*ip;
-	uint		flags;
-	int		error;
-	struct timespec64 tv;
-	struct inode	*inode;
-
-	/*
-	 * Call the space management code to pick
-	 * the on-disk inode to be allocated.
-	 */
-	error = xfs_dialloc(tp, pip ? pip->i_ino : 0, mode,
-			    ialloc_context, &ino);
-	if (error)
-		return error;
-	if (*ialloc_context || ino == NULLFSINO) {
-		*ipp = NULL;
-		return 0;
-	}
-	ASSERT(*ialloc_context == NULL);
+	struct xfs_mount	*mp = tp->t_mountp;
+	struct xfs_inode	*ip;
+	unsigned int		flags;
+	int			error;
+	struct timespec64	tv;
+	struct inode		*inode;
 
 	/*
 	 * Protect against obviously corrupt allocation btree records. Later
@@ -833,18 +790,16 @@ xfs_ialloc(
 	 */
 	if ((pip && ino == pip->i_ino) || !xfs_verify_dir_ino(mp, ino)) {
 		xfs_alert(mp, "Allocated a known in-use inode 0x%llx!", ino);
-		return -EFSCORRUPTED;
+		return ERR_PTR(-EFSCORRUPTED);
 	}
 
 	/*
-	 * Get the in-core inode with the lock held exclusively.
-	 * This is because we're setting fields here we need
-	 * to prevent others from looking at until we're done.
+	 * Get the in-core inode with the lock held exclusively to prevent
+	 * others from looking at until we're done.
 	 */
-	error = xfs_iget(mp, tp, ino, XFS_IGET_CREATE,
-			 XFS_ILOCK_EXCL, &ip);
+	error = xfs_iget(mp, tp, ino, XFS_IGET_CREATE, XFS_ILOCK_EXCL, &ip);
 	if (error)
-		return error;
+		return ERR_PTR(error);
 	ASSERT(ip != NULL);
 	inode = VFS_I(ip);
 	inode->i_mode = mode;
@@ -926,22 +881,21 @@ xfs_ialloc(
 
 	/* now that we have an i_mode we can setup the inode structure */
 	xfs_setup_inode(ip);
-
-	*ipp = ip;
-	return 0;
+	return ip;
 }
 
 /*
- * Allocates a new inode from disk and return a pointer to the
- * incore copy. This routine will internally commit the current
- * transaction and allocate a new one if the Space Manager needed
- * to do an allocation to replenish the inode free-list.
- *
- * This routine is designed to be called from xfs_create and
- * xfs_create_dir.
+ * Allocates a new inode from disk and return a pointer to the incore copy. This
+ * routine will internally commit the current transaction and allocate a new one
+ * if we needed to allocate more on-disk free inodes to perform the requested
+ * operation.
  *
+ * If we are allocating quota inodes, we do not have a parent inode to attach to
+ * or associate with (i.e. dp == NULL) because they are not linked into the
+ * directory structure - they are attached directly to the superblock - and so
+ * have no parent.
  */
-int
+struct xfs_inode *
 xfs_dir_ialloc(
 	xfs_trans_t	**tpp,		/* input: current transaction;
 					   output: may be a new transaction. */
@@ -950,90 +904,59 @@ xfs_dir_ialloc(
 	umode_t		mode,
 	xfs_nlink_t	nlink,
 	dev_t		rdev,
-	prid_t		prid,		/* project id */
-	xfs_inode_t	**ipp)		/* pointer to inode; it will be
-					   locked. */
+	prid_t		prid)		/* project id */
 {
-	xfs_trans_t	*tp;
 	xfs_inode_t	*ip;
 	xfs_buf_t	*ialloc_context = NULL;
-	int		code;
-
-	tp = *tpp;
-	ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES);
+	xfs_ino_t	parent_ino = dp ? dp->i_ino : 0;
+	xfs_ino_t	ino;
+	int		error;
 
-	/*
-	 * xfs_ialloc will return a pointer to an incore inode if
-	 * the Space Manager has an available inode on the free
-	 * list. Otherwise, it will do an allocation and replenish
-	 * the freelist.  Since we can only do one allocation per
-	 * transaction without deadlocks, we will need to commit the
-	 * current transaction and start a new one.  We will then
-	 * need to call xfs_ialloc again to get the inode.
-	 *
-	 * If xfs_ialloc did an allocation to replenish the freelist,
-	 * it returns the bp containing the head of the freelist as
-	 * ialloc_context. We will hold a lock on it across the
-	 * transaction commit so that no other process can steal
-	 * the inode(s) that we've just allocated.
-	 */
-	code = xfs_ialloc(tp, dp, mode, nlink, rdev, prid, &ialloc_context,
-			&ip);
+	ASSERT((*tpp)->t_flags & XFS_TRANS_PERM_LOG_RES);
 
 	/*
-	 * Return an error if we were unable to allocate a new inode.
-	 * This should only happen if we run out of space on disk or
-	 * encounter a disk error.
+	 * Call the space management code to pick the on-disk inode to be
+	 * allocated and replenish the freelist.  Since we can only do one
+	 * allocation per transaction without deadlocks, we will need to
+	 * commit the current transaction and start a new one.
+	 * If xfs_dialloc did an allocation to replenish the freelist, it
+	 * returns the bp containing the head of the freelist as
+	 * ialloc_context. We will hold a lock on it across the transaction
+	 * commit so that no other process can steal the inode(s) that we've
+	 * just allocated.
 	 */
-	if (code) {
-		*ipp = NULL;
-		return code;
-	}
-	if (!ialloc_context && !ip) {
-		*ipp = NULL;
-		return -ENOSPC;
-	}
+	error = xfs_dialloc(*tpp, parent_ino, mode, &ialloc_context, &ino);
+	if (error)
+		return ERR_PTR(error);
 
 	/*
 	 * If the AGI buffer is non-NULL, then we were unable to get an
 	 * inode in one operation.  We need to commit the current
-	 * transaction and call xfs_ialloc() again.  It is guaranteed
+	 * transaction and call xfs_dialloc() again.  It is guaranteed
 	 * to succeed the second time.
 	 */
 	if (ialloc_context) {
-		code = xfs_dialloc_roll(&tp, ialloc_context);
-		if (code) {
+		error = xfs_dialloc_roll(tpp, ialloc_context);
+		if (error) {
 			xfs_buf_relse(ialloc_context);
-			*tpp = tp;
-			*ipp = NULL;
-			return code;
+			return ERR_PTR(error);
 		}
-
 		/*
-		 * Call ialloc again. Since we've locked out all
-		 * other allocations in this allocation group,
-		 * this call should always succeed.
+		 * Call dialloc again. Since we've locked out all other
+		 * allocations in this allocation group, this call should
+		 * always succeed.
 		 */
-		code = xfs_ialloc(tp, dp, mode, nlink, rdev, prid,
-				  &ialloc_context, &ip);
-
-		/*
-		 * If we get an error at this point, return to the caller
-		 * so that the current transaction can be aborted.
-		 */
-		if (code) {
-			*tpp = tp;
-			*ipp = NULL;
-			return code;
-		}
-		ASSERT(!ialloc_context && ip);
-
+		error = xfs_dialloc(*tpp, parent_ino, mode,
+				    &ialloc_context, &ino);
+		if (error)
+			return ERR_PTR(error);
+		ASSERT(!ialloc_context);
 	}
 
-	*ipp = ip;
-	*tpp = tp;
+	if (ino == NULLFSINO)
+		return ERR_PTR(-ENOSPC);
 
-	return 0;
+	return xfs_init_new_inode(*tpp, dp, ino, mode, nlink, rdev, prid);
 }
 
 /*
@@ -1147,9 +1070,12 @@ xfs_create(
 	 * entry pointing to them, but a directory also the "." entry
 	 * pointing to itself.
 	 */
-	error = xfs_dir_ialloc(&tp, dp, mode, is_dir ? 2 : 1, rdev, prid, &ip);
-	if (error)
+	ip = xfs_dir_ialloc(&tp, dp, mode, is_dir ? 2 : 1, rdev, prid);
+	if (IS_ERR(ip)) {
+		error = PTR_ERR(ip);
+		ip = NULL;
 		goto out_trans_cancel;
+	}
 
 	/*
 	 * Now we join the directory inode to the transaction.  We do not do it
@@ -1269,9 +1195,12 @@ xfs_create_tmpfile(
 	if (error)
 		goto out_trans_cancel;
 
-	error = xfs_dir_ialloc(&tp, dp, mode, 0, 0, prid, &ip);
-	if (error)
+	ip = xfs_dir_ialloc(&tp, dp, mode, 0, 0, prid);
+	if (IS_ERR(ip)) {
+		error = PTR_ERR(ip);
+		ip = NULL;
 		goto out_trans_cancel;
+	}
 
 	if (mp->m_flags & XFS_MOUNT_WSYNC)
 		xfs_trans_set_sync(tp);
diff --git a/fs/xfs/xfs_inode.h b/fs/xfs/xfs_inode.h
index 751a3d1d7d84..95b4ae35e6df 100644
--- a/fs/xfs/xfs_inode.h
+++ b/fs/xfs/xfs_inode.h
@@ -407,9 +407,9 @@ void		xfs_lock_two_inodes(struct xfs_inode *ip0, uint ip0_mode,
 xfs_extlen_t	xfs_get_extsz_hint(struct xfs_inode *ip);
 xfs_extlen_t	xfs_get_cowextsz_hint(struct xfs_inode *ip);
 
-int		xfs_dir_ialloc(struct xfs_trans **, struct xfs_inode *, umode_t,
-			       xfs_nlink_t, dev_t, prid_t,
-			       struct xfs_inode **);
+struct xfs_inode *
+xfs_dir_ialloc(struct xfs_trans **, struct xfs_inode *, umode_t, xfs_nlink_t,
+	       dev_t, prid_t);
 
 static inline int
 xfs_itruncate_extents(
diff --git a/fs/xfs/xfs_qm.c b/fs/xfs/xfs_qm.c
index b2a9abee8b2b..bfdf71d87777 100644
--- a/fs/xfs/xfs_qm.c
+++ b/fs/xfs/xfs_qm.c
@@ -737,15 +737,15 @@ xfs_qm_destroy_quotainfo(
  */
 STATIC int
 xfs_qm_qino_alloc(
-	xfs_mount_t	*mp,
-	xfs_inode_t	**ip,
-	uint		flags)
+	struct xfs_mount	*mp,
+	struct xfs_inode	**ipp,
+	unsigned int		flags)
 {
 	xfs_trans_t	*tp;
 	int		error;
 	bool		need_alloc = true;
 
-	*ip = NULL;
+	*ipp = NULL;
 	/*
 	 * With superblock that doesn't have separate pquotino, we
 	 * share an inode between gquota and pquota. If the on-disk
@@ -771,7 +771,7 @@ xfs_qm_qino_alloc(
 				return -EFSCORRUPTED;
 		}
 		if (ino != NULLFSINO) {
-			error = xfs_iget(mp, NULL, ino, 0, 0, ip);
+			error = xfs_iget(mp, NULL, ino, 0, 0, ipp);
 			if (error)
 				return error;
 			mp->m_sb.sb_gquotino = NULLFSINO;
@@ -787,11 +787,14 @@ xfs_qm_qino_alloc(
 		return error;
 
 	if (need_alloc) {
-		error = xfs_dir_ialloc(&tp, NULL, S_IFREG, 1, 0, 0, ip);
-		if (error) {
+		struct xfs_inode *ip;
+
+		ip = xfs_dir_ialloc(&tp, NULL, S_IFREG, 1, 0, 0);
+		if (IS_ERR(ip)) {
 			xfs_trans_cancel(tp);
-			return error;
+			return PTR_ERR(ip);
 		}
+		*ipp = ip;
 	}
 
 	/*
@@ -812,11 +815,11 @@ xfs_qm_qino_alloc(
 		mp->m_sb.sb_qflags = mp->m_qflags & XFS_ALL_QUOTA_ACCT;
 	}
 	if (flags & XFS_QMOPT_UQUOTA)
-		mp->m_sb.sb_uquotino = (*ip)->i_ino;
+		mp->m_sb.sb_uquotino = (*ipp)->i_ino;
 	else if (flags & XFS_QMOPT_GQUOTA)
-		mp->m_sb.sb_gquotino = (*ip)->i_ino;
+		mp->m_sb.sb_gquotino = (*ipp)->i_ino;
 	else
-		mp->m_sb.sb_pquotino = (*ip)->i_ino;
+		mp->m_sb.sb_pquotino = (*ipp)->i_ino;
 	spin_unlock(&mp->m_sb_lock);
 	xfs_log_sb(tp);
 
@@ -826,7 +829,7 @@ xfs_qm_qino_alloc(
 		xfs_alert(mp, "%s failed (error %d)!", __func__, error);
 	}
 	if (need_alloc)
-		xfs_finish_inode_setup(*ip);
+		xfs_finish_inode_setup(*ipp);
 	return error;
 }
 
diff --git a/fs/xfs/xfs_symlink.c b/fs/xfs/xfs_symlink.c
index 8e88a7ca387e..988fc771f089 100644
--- a/fs/xfs/xfs_symlink.c
+++ b/fs/xfs/xfs_symlink.c
@@ -223,10 +223,12 @@ xfs_symlink(
 	/*
 	 * Allocate an inode for the symlink.
 	 */
-	error = xfs_dir_ialloc(&tp, dp, S_IFLNK | (mode & ~S_IFMT), 1, 0,
-			       prid, &ip);
-	if (error)
+	ip = xfs_dir_ialloc(&tp, dp, S_IFLNK | (mode & ~S_IFMT), 1, 0, prid);
+	if (IS_ERR(ip)) {
+		error = PTR_ERR(ip);
+		ip = NULL;
 		goto out_trans_cancel;
+	}
 
 	/*
 	 * Now we join the directory inode to the transaction.  We do not do it
-- 
2.27.0

[PATCH v5 4/6] xfs: move xfs_dialloc_roll() into xfs_dialloc()

[Gao Xiang]

From: Dave Chinner <dchinner@redhat.com>

Get rid of the confusing ialloc_context and failure handling around
xfs_dialloc() by moving xfs_dialloc_roll() into xfs_dialloc().

Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Gao Xiang <hsiangkao@redhat.com>
---
 fs/xfs/libxfs/xfs_ialloc.c | 59 +++++++++++++-------------------------
 fs/xfs/libxfs/xfs_ialloc.h | 21 +-------------
 fs/xfs/xfs_inode.c         | 38 ++----------------------
 3 files changed, 24 insertions(+), 94 deletions(-)

diff --git a/fs/xfs/libxfs/xfs_ialloc.c b/fs/xfs/libxfs/xfs_ialloc.c
index 23e94d43acb2..074c2d83de77 100644
--- a/fs/xfs/libxfs/xfs_ialloc.c
+++ b/fs/xfs/libxfs/xfs_ialloc.c
@@ -1682,7 +1682,7 @@ xfs_dialloc_ag(
 	return error;
 }
 
-int
+static int
 xfs_dialloc_roll(
 	struct xfs_trans	**tpp,
 	struct xfs_buf		*agibp)
@@ -1731,30 +1731,18 @@ xfs_dialloc_roll(
  * Mode is used to tell whether the new inode will need space, and whether it
  * is a directory.
  *
- * This function is designed to be called twice if it has to do an allocation
- * to make more free inodes.  On the first call, *IO_agbp should be set to NULL.
- * If an inode is available without having to performn an allocation, an inode
- * number is returned.  In this case, *IO_agbp is set to NULL.  If an allocation
- * needs to be done, xfs_dialloc returns the current AGI buffer in *IO_agbp.
- * The caller should then commit the current transaction, allocate a
- * new transaction, and call xfs_dialloc() again, passing in the previous value
- * of *IO_agbp.  IO_agbp should be held across the transactions. Since the AGI
- * buffer is locked across the two calls, the second call is guaranteed to have
- * a free inode available.
- *
  * Once we successfully pick an inode its number is returned and the on-disk
  * data structures are updated.  The inode itself is not read in, since doing so
  * would break ordering constraints with xfs_reclaim.
  */
 int
 xfs_dialloc(
-	struct xfs_trans	*tp,
+	struct xfs_trans	**tpp,
 	xfs_ino_t		parent,
 	umode_t			mode,
-	struct xfs_buf		**IO_agbp,
 	xfs_ino_t		*inop)
 {
-	struct xfs_mount	*mp = tp->t_mountp;
+	struct xfs_mount	*mp = (*tpp)->t_mountp;
 	struct xfs_buf		*agbp;
 	xfs_agnumber_t		agno;
 	int			error;
@@ -1765,21 +1753,11 @@ xfs_dialloc(
 	struct xfs_ino_geometry	*igeo = M_IGEO(mp);
 	bool			okalloc = true;
 
-	if (*IO_agbp) {
-		/*
-		 * If the caller passes in a pointer to the AGI buffer,
-		 * continue where we left off before.  In this case, we
-		 * know that the allocation group has free inodes.
-		 */
-		agbp = *IO_agbp;
-		goto out_alloc;
-	}
-
 	/*
 	 * We do not have an agbp, so select an initial allocation
 	 * group for inode allocation.
 	 */
-	start_agno = xfs_ialloc_ag_select(tp, parent, mode);
+	start_agno = xfs_ialloc_ag_select(*tpp, parent, mode);
 	if (start_agno == NULLAGNUMBER) {
 		*inop = NULLFSINO;
 		return 0;
@@ -1814,7 +1792,7 @@ xfs_dialloc(
 		}
 
 		if (!pag->pagi_init) {
-			error = xfs_ialloc_pagi_init(mp, tp, agno);
+			error = xfs_ialloc_pagi_init(mp, *tpp, agno);
 			if (error)
 				goto out_error;
 		}
@@ -1829,7 +1807,7 @@ xfs_dialloc(
 		 * Then read in the AGI buffer and recheck with the AGI buffer
 		 * lock held.
 		 */
-		error = xfs_ialloc_read_agi(mp, tp, agno, &agbp);
+		error = xfs_ialloc_read_agi(mp, *tpp, agno, &agbp);
 		if (error)
 			goto out_error;
 
@@ -1842,9 +1820,9 @@ xfs_dialloc(
 			goto nextag_relse_buffer;
 
 
-		error = xfs_ialloc_ag_alloc(tp, agbp, &ialloced);
+		error = xfs_ialloc_ag_alloc(*tpp, agbp, &ialloced);
 		if (error) {
-			xfs_trans_brelse(tp, agbp);
+			xfs_trans_brelse(*tpp, agbp);
 
 			if (error != -ENOSPC)
 				goto out_error;
@@ -1856,21 +1834,25 @@ xfs_dialloc(
 
 		if (ialloced) {
 			/*
-			 * We successfully allocated some inodes, return
-			 * the current context to the caller so that it
-			 * can commit the current transaction and call
-			 * us again where we left off.
+			 * We successfully allocated space for an inode cluster
+			 * in this AG.  Roll the transaction so that we can
+			 * allocate one of the new inodes.
 			 */
 			ASSERT(pag->pagi_freecount > 0);
 			xfs_perag_put(pag);
 
-			*IO_agbp = agbp;
+			error = xfs_dialloc_roll(tpp, agbp);
+			if (error) {
+				xfs_buf_relse(agbp);
+				return error;
+			}
+
 			*inop = NULLFSINO;
-			return 0;
+			goto out_alloc;
 		}
 
 nextag_relse_buffer:
-		xfs_trans_brelse(tp, agbp);
+		xfs_trans_brelse(*tpp, agbp);
 nextag:
 		xfs_perag_put(pag);
 		if (++agno == mp->m_sb.sb_agcount)
@@ -1882,8 +1864,7 @@ xfs_dialloc(
 	}
 
 out_alloc:
-	*IO_agbp = NULL;
-	return xfs_dialloc_ag(tp, agbp, parent, inop);
+	return xfs_dialloc_ag(*tpp, agbp, parent, inop);
 out_error:
 	xfs_perag_put(pag);
 	return error;
diff --git a/fs/xfs/libxfs/xfs_ialloc.h b/fs/xfs/libxfs/xfs_ialloc.h
index bd6e0db9e23c..13810ffe4af9 100644
--- a/fs/xfs/libxfs/xfs_ialloc.h
+++ b/fs/xfs/libxfs/xfs_ialloc.h
@@ -32,39 +32,20 @@ xfs_make_iptr(struct xfs_mount *mp, struct xfs_buf *b, int o)
 	return xfs_buf_offset(b, o << (mp)->m_sb.sb_inodelog);
 }
 
-int
-xfs_dialloc_roll(
-	struct xfs_trans	**tpp,
-	struct xfs_buf		*agibp);
-
 /*
  * Allocate an inode on disk.
  * Mode is used to tell whether the new inode will need space, and whether
  * it is a directory.
  *
- * To work within the constraint of one allocation per transaction,
- * xfs_dialloc() is designed to be called twice if it has to do an
- * allocation to make more free inodes.  If an inode is
- * available without an allocation, agbp would be set to the current
- * agbp and alloc_done set to false.
- * If an allocation needed to be done, agbp would be set to the
- * inode header of the allocation group and alloc_done set to true.
- * The caller should then commit the current transaction and allocate a new
- * transaction.  xfs_dialloc() should then be called again with
- * the agbp value returned from the previous call.
- *
  * Once we successfully pick an inode its number is returned and the
  * on-disk data structures are updated.  The inode itself is not read
  * in, since doing so would break ordering constraints with xfs_reclaim.
- *
- * *agbp should be set to NULL on the first call, *alloc_done set to FALSE.
  */
 int					/* error */
 xfs_dialloc(
-	struct xfs_trans *tp,		/* transaction pointer */
+	struct xfs_trans **tpp,		/* double pointer of transaction */
 	xfs_ino_t	parent,		/* parent inode (directory) */
 	umode_t		mode,		/* mode bits for new inode */
-	struct xfs_buf	**agbp,		/* buf for a.g. inode header */
 	xfs_ino_t	*inop);		/* inode number allocated */
 
 /*
diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
index 07d692020da3..860979fe18c3 100644
--- a/fs/xfs/xfs_inode.c
+++ b/fs/xfs/xfs_inode.c
@@ -907,7 +907,6 @@ xfs_dir_ialloc(
 	prid_t		prid)		/* project id */
 {
 	xfs_inode_t	*ip;
-	xfs_buf_t	*ialloc_context = NULL;
 	xfs_ino_t	parent_ino = dp ? dp->i_ino : 0;
 	xfs_ino_t	ino;
 	int		error;
@@ -916,43 +915,12 @@ xfs_dir_ialloc(
 
 	/*
 	 * Call the space management code to pick the on-disk inode to be
-	 * allocated and replenish the freelist.  Since we can only do one
-	 * allocation per transaction without deadlocks, we will need to
-	 * commit the current transaction and start a new one.
-	 * If xfs_dialloc did an allocation to replenish the freelist, it
-	 * returns the bp containing the head of the freelist as
-	 * ialloc_context. We will hold a lock on it across the transaction
-	 * commit so that no other process can steal the inode(s) that we've
-	 * just allocated.
-	 */
-	error = xfs_dialloc(*tpp, parent_ino, mode, &ialloc_context, &ino);
+	 * allocated.
+	 */
+	error = xfs_dialloc(tpp, parent_ino, mode, &ino);
 	if (error)
 		return ERR_PTR(error);
 
-	/*
-	 * If the AGI buffer is non-NULL, then we were unable to get an
-	 * inode in one operation.  We need to commit the current
-	 * transaction and call xfs_dialloc() again.  It is guaranteed
-	 * to succeed the second time.
-	 */
-	if (ialloc_context) {
-		error = xfs_dialloc_roll(tpp, ialloc_context);
-		if (error) {
-			xfs_buf_relse(ialloc_context);
-			return ERR_PTR(error);
-		}
-		/*
-		 * Call dialloc again. Since we've locked out all other
-		 * allocations in this allocation group, this call should
-		 * always succeed.
-		 */
-		error = xfs_dialloc(*tpp, parent_ino, mode,
-				    &ialloc_context, &ino);
-		if (error)
-			return ERR_PTR(error);
-		ASSERT(!ialloc_context);
-	}
-
 	if (ino == NULLFSINO)
 		return ERR_PTR(-ENOSPC);
 
-- 
2.27.0

[PATCH v5 5/6] xfs: spilt xfs_dialloc() into 2 functions

[Gao Xiang]

From: Dave Chinner <dchinner@redhat.com>

This patch explicitly separates free inode chunk allocation and
inode allocation into two individual high level operations.

Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Gao Xiang <hsiangkao@redhat.com>
---
 fs/xfs/libxfs/xfs_ialloc.c | 54 +++++++++++++++++---------------------
 fs/xfs/libxfs/xfs_ialloc.h | 20 ++++++++++----
 fs/xfs/xfs_inode.c         | 18 ++++++++-----
 3 files changed, 51 insertions(+), 41 deletions(-)

diff --git a/fs/xfs/libxfs/xfs_ialloc.c b/fs/xfs/libxfs/xfs_ialloc.c
index 074c2d83de77..dcb076d5c390 100644
--- a/fs/xfs/libxfs/xfs_ialloc.c
+++ b/fs/xfs/libxfs/xfs_ialloc.c
@@ -1570,7 +1570,7 @@ xfs_dialloc_ag_update_inobt(
  * The caller selected an AG for us, and made sure that free inodes are
  * available.
  */
-STATIC int
+int
 xfs_dialloc_ag(
 	struct xfs_trans	*tp,
 	struct xfs_buf		*agbp,
@@ -1726,21 +1726,22 @@ xfs_dialloc_roll(
 }
 
 /*
- * Allocate an inode on disk.
+ * Select and prepare an AG for inode allocation.
  *
- * Mode is used to tell whether the new inode will need space, and whether it
- * is a directory.
+ * Mode is used to tell whether the new inode is a directory and hence where to
+ * locate it.
  *
- * Once we successfully pick an inode its number is returned and the on-disk
- * data structures are updated.  The inode itself is not read in, since doing so
- * would break ordering constraints with xfs_reclaim.
+ * This function will ensure that the selected AG has free inodes available to
+ * allocate from. The selected AGI will be returned locked to the caller, and it
+ * will allocate more free inodes if required. If no free inodes are found or
+ * can be allocated, no AGI will be returned.
  */
 int
-xfs_dialloc(
+xfs_dialloc_select_ag(
 	struct xfs_trans	**tpp,
 	xfs_ino_t		parent,
 	umode_t			mode,
-	xfs_ino_t		*inop)
+	struct xfs_buf		**IO_agbp)
 {
 	struct xfs_mount	*mp = (*tpp)->t_mountp;
 	struct xfs_buf		*agbp;
@@ -1753,15 +1754,15 @@ xfs_dialloc(
 	struct xfs_ino_geometry	*igeo = M_IGEO(mp);
 	bool			okalloc = true;
 
+	*IO_agbp = NULL;
+
 	/*
 	 * We do not have an agbp, so select an initial allocation
 	 * group for inode allocation.
 	 */
 	start_agno = xfs_ialloc_ag_select(*tpp, parent, mode);
-	if (start_agno == NULLAGNUMBER) {
-		*inop = NULLFSINO;
+	if (start_agno == NULLAGNUMBER)
 		return 0;
-	}
 
 	/*
 	 * If we have already hit the ceiling of inode blocks then clear
@@ -1794,7 +1795,7 @@ xfs_dialloc(
 		if (!pag->pagi_init) {
 			error = xfs_ialloc_pagi_init(mp, *tpp, agno);
 			if (error)
-				goto out_error;
+				break;
 		}
 
 		/*
@@ -1809,11 +1810,11 @@ xfs_dialloc(
 		 */
 		error = xfs_ialloc_read_agi(mp, *tpp, agno, &agbp);
 		if (error)
-			goto out_error;
+			break;
 
 		if (pag->pagi_freecount) {
 			xfs_perag_put(pag);
-			goto out_alloc;
+			goto found_ag;
 		}
 
 		if (!okalloc)
@@ -1824,12 +1825,9 @@ xfs_dialloc(
 		if (error) {
 			xfs_trans_brelse(*tpp, agbp);
 
-			if (error != -ENOSPC)
-				goto out_error;
-
-			xfs_perag_put(pag);
-			*inop = NULLFSINO;
-			return 0;
+			if (error == -ENOSPC)
+				error = 0;
+			break;
 		}
 
 		if (ialloced) {
@@ -1846,9 +1844,7 @@ xfs_dialloc(
 				xfs_buf_relse(agbp);
 				return error;
 			}
-
-			*inop = NULLFSINO;
-			goto out_alloc;
+			goto found_ag;
 		}
 
 nextag_relse_buffer:
@@ -1857,17 +1853,15 @@ xfs_dialloc(
 		xfs_perag_put(pag);
 		if (++agno == mp->m_sb.sb_agcount)
 			agno = 0;
-		if (agno == start_agno) {
-			*inop = NULLFSINO;
+		if (agno == start_agno)
 			return noroom ? -ENOSPC : 0;
-		}
 	}
 
-out_alloc:
-	return xfs_dialloc_ag(*tpp, agbp, parent, inop);
-out_error:
 	xfs_perag_put(pag);
 	return error;
+found_ag:
+	*IO_agbp = agbp;
+	return 0;
 }
 
 /*
diff --git a/fs/xfs/libxfs/xfs_ialloc.h b/fs/xfs/libxfs/xfs_ialloc.h
index 13810ffe4af9..3511086a7ae1 100644
--- a/fs/xfs/libxfs/xfs_ialloc.h
+++ b/fs/xfs/libxfs/xfs_ialloc.h
@@ -37,16 +37,26 @@ xfs_make_iptr(struct xfs_mount *mp, struct xfs_buf *b, int o)
  * Mode is used to tell whether the new inode will need space, and whether
  * it is a directory.
  *
- * Once we successfully pick an inode its number is returned and the
- * on-disk data structures are updated.  The inode itself is not read
- * in, since doing so would break ordering constraints with xfs_reclaim.
+ * There are two phases to inode allocation: selecting an AG and ensuring
+ * that it contains free inodes, followed by allocating one of the free
+ * inodes. xfs_dialloc_select_ag() does the former and returns a locked AGI
+ * to the caller, ensuring that followup call to xfs_dialloc_ag() will
+ * have free inodes to allocate from. xfs_dialloc_ag() will return the inode
+ * number of the free inode we allocated.
  */
 int					/* error */
-xfs_dialloc(
+xfs_dialloc_select_ag(
 	struct xfs_trans **tpp,		/* double pointer of transaction */
 	xfs_ino_t	parent,		/* parent inode (directory) */
 	umode_t		mode,		/* mode bits for new inode */
-	xfs_ino_t	*inop);		/* inode number allocated */
+	struct xfs_buf	**IO_agbp);
+
+int
+xfs_dialloc_ag(
+	struct xfs_trans	*tp,
+	struct xfs_buf		*agbp,
+	xfs_ino_t		parent,
+	xfs_ino_t		*inop);
 
 /*
  * Free disk inode.  Carefully avoids touching the incore inode, all
diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
index 860979fe18c3..3bbd3f5a57b1 100644
--- a/fs/xfs/xfs_inode.c
+++ b/fs/xfs/xfs_inode.c
@@ -906,10 +906,10 @@ xfs_dir_ialloc(
 	dev_t		rdev,
 	prid_t		prid)		/* project id */
 {
-	xfs_inode_t	*ip;
-	xfs_ino_t	parent_ino = dp ? dp->i_ino : 0;
-	xfs_ino_t	ino;
-	int		error;
+	struct xfs_buf		*agibp;
+	xfs_ino_t		parent_ino = dp ? dp->i_ino : 0;
+	xfs_ino_t		ino;
+	int			error;
 
 	ASSERT((*tpp)->t_flags & XFS_TRANS_PERM_LOG_RES);
 
@@ -917,13 +917,19 @@ xfs_dir_ialloc(
 	 * Call the space management code to pick the on-disk inode to be
 	 * allocated.
 	 */
-	error = xfs_dialloc(tpp, parent_ino, mode, &ino);
+	error = xfs_dialloc_select_ag(tpp, parent_ino, mode, &agibp);
 	if (error)
 		return ERR_PTR(error);
 
-	if (ino == NULLFSINO)
+	if (!agibp)
 		return ERR_PTR(-ENOSPC);
 
+	/* Allocate an inode from the selected AG */
+	error = xfs_dialloc_ag(*tpp, agibp, parent_ino, &ino);
+	if (error)
+		return ERR_PTR(error);
+	ASSERT(ino != NULLFSINO);
+
 	return xfs_init_new_inode(*tpp, dp, ino, mode, nlink, rdev, prid);
 }
 
-- 
2.27.0

[PATCH v5 6/6] xfs: kill ialloced in xfs_dialloc()

[Gao Xiang]

It's enough to just use return code, and get rid of an argument.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Gao Xiang <hsiangkao@redhat.com>
---
 fs/xfs/libxfs/xfs_ialloc.c | 22 +++++++++-------------
 1 file changed, 9 insertions(+), 13 deletions(-)

diff --git a/fs/xfs/libxfs/xfs_ialloc.c b/fs/xfs/libxfs/xfs_ialloc.c
index dcb076d5c390..063a1a543890 100644
--- a/fs/xfs/libxfs/xfs_ialloc.c
+++ b/fs/xfs/libxfs/xfs_ialloc.c
@@ -607,13 +607,13 @@ xfs_inobt_insert_sprec(
 
 /*
  * Allocate new inodes in the allocation group specified by agbp.
- * Return 0 for success, else error code.
+ * Returns 0 if inodes were allocated in this AG; 1 if there was no space
+ * in this AG; or the usual negative error code.
  */
 STATIC int
 xfs_ialloc_ag_alloc(
 	struct xfs_trans	*tp,
-	struct xfs_buf		*agbp,
-	int			*alloc)
+	struct xfs_buf		*agbp)
 {
 	struct xfs_agi		*agi;
 	struct xfs_alloc_arg	args;
@@ -795,10 +795,9 @@ xfs_ialloc_ag_alloc(
 		allocmask = (1 << (newlen / XFS_INODES_PER_HOLEMASK_BIT)) - 1;
 	}
 
-	if (args.fsbno == NULLFSBLOCK) {
-		*alloc = 0;
-		return 0;
-	}
+	if (args.fsbno == NULLFSBLOCK)
+		return 1;
+
 	ASSERT(args.len == args.minlen);
 
 	/*
@@ -903,7 +902,6 @@ xfs_ialloc_ag_alloc(
 	 */
 	xfs_trans_mod_sb(tp, XFS_TRANS_SB_ICOUNT, (long)newlen);
 	xfs_trans_mod_sb(tp, XFS_TRANS_SB_IFREE, (long)newlen);
-	*alloc = 1;
 	return 0;
 }
 
@@ -1747,7 +1745,6 @@ xfs_dialloc_select_ag(
 	struct xfs_buf		*agbp;
 	xfs_agnumber_t		agno;
 	int			error;
-	int			ialloced;
 	bool			noroom = false;
 	xfs_agnumber_t		start_agno;
 	struct xfs_perag	*pag;
@@ -1820,9 +1817,8 @@ xfs_dialloc_select_ag(
 		if (!okalloc)
 			goto nextag_relse_buffer;
 
-
-		error = xfs_ialloc_ag_alloc(*tpp, agbp, &ialloced);
-		if (error) {
+		error = xfs_ialloc_ag_alloc(*tpp, agbp);
+		if (error < 0) {
 			xfs_trans_brelse(*tpp, agbp);
 
 			if (error == -ENOSPC)
@@ -1830,7 +1826,7 @@ xfs_dialloc_select_ag(
 			break;
 		}
 
-		if (ialloced) {
+		if (error == 0) {
 			/*
 			 * We successfully allocated space for an inode cluster
 			 * in this AG.  Roll the transaction so that we can
-- 
2.27.0