xfs: convert kmem_alloc() to kmalloc()

kmem_alloc() is just a thin wrapper around kmalloc() these days.
Convert everything to use kmalloc() so we can get rid of the
wrapper.

Note: the transaction region allocation in xlog_add_to_transaction()
can be a high order allocation. Converting it to use
kmalloc(__GFP_NOFAIL) results in warnings in the page allocation
code being triggered because the mm subsystem does not want us to
use __GFP_NOFAIL with high order allocations like we've been doing
with the kmem_alloc() wrapper for a couple of decades. Hence this
specific case gets converted to xlog_kvmalloc() rather than
kmalloc() to avoid this issue.

Signed-off-by: Dave Chinner <[email protected]>
Reviewed-by: "Darrick J. Wong" <[email protected]>
Signed-off-by: Chandan Babu R <[email protected]>

1 files changed, 8 insertions, 7 deletions

diff --git a/fs/xfs/libxfs/xfs_inode_fork.c b/fs/xfs/libxfs/xfs_inode_fork.c
index f4569e18a8d0..f3cf7f933e15 100644
--- a/fs/xfs/libxfs/xfs_inode_fork.c
+++ b/fs/xfs/libxfs/xfs_inode_fork.c
@@ -50,7 +50,7 @@ xfs_init_local_fork(
 		mem_size++;
 
 	if (size) {
-		char *new_data = kmem_alloc(mem_size, KM_NOFS);
+		char *new_data = kmalloc(mem_size, GFP_NOFS | __GFP_NOFAIL);
 
 		memcpy(new_data, data, size);
 		if (zero_terminate)
@@ -77,7 +77,7 @@ xfs_iformat_local(
 	/*
 	 * If the size is unreasonable, then something
 	 * is wrong and we just bail out rather than crash in
-	 * kmem_alloc() or memcpy() below.
+	 * kmalloc() or memcpy() below.
 	 */
 	if (unlikely(size > XFS_DFORK_SIZE(dip, ip->i_mount, whichfork))) {
 		xfs_warn(ip->i_mount,
@@ -116,7 +116,7 @@ xfs_iformat_extents(
 
 	/*
 	 * If the number of extents is unreasonable, then something is wrong and
-	 * we just bail out rather than crash in kmem_alloc() or memcpy() below.
+	 * we just bail out rather than crash in kmalloc() or memcpy() below.
 	 */
 	if (unlikely(size < 0 || size > XFS_DFORK_SIZE(dip, mp, whichfork))) {
 		xfs_warn(ip->i_mount, "corrupt inode %llu ((a)extents = %llu).",
@@ -205,7 +205,7 @@ xfs_iformat_btree(
 	}
 
 	ifp->if_broot_bytes = size;
-	ifp->if_broot = kmem_alloc(size, KM_NOFS);
+	ifp->if_broot = kmalloc(size, GFP_NOFS | __GFP_NOFAIL);
 	ASSERT(ifp->if_broot != NULL);
 	/*
 	 * Copy and convert from the on-disk structure
@@ -399,7 +399,8 @@ xfs_iroot_realloc(
 		 */
 		if (ifp->if_broot_bytes == 0) {
 			new_size = XFS_BMAP_BROOT_SPACE_CALC(mp, rec_diff);
-			ifp->if_broot = kmem_alloc(new_size, KM_NOFS);
+			ifp->if_broot = kmalloc(new_size,
+						GFP_NOFS | __GFP_NOFAIL);
 			ifp->if_broot_bytes = (int)new_size;
 			return;
 		}
@@ -440,7 +441,7 @@ xfs_iroot_realloc(
 	else
 		new_size = 0;
 	if (new_size > 0) {
-		new_broot = kmem_alloc(new_size, KM_NOFS);
+		new_broot = kmalloc(new_size, GFP_NOFS | __GFP_NOFAIL);
 		/*
 		 * First copy over the btree block header.
 		 */
@@ -488,7 +489,7 @@ xfs_iroot_realloc(
  *
  * If the amount of space needed has decreased below the size of the
  * inline buffer, then switch to using the inline buffer.  Otherwise,
- * use kmem_realloc() or kmem_alloc() to adjust the size of the buffer
+ * use krealloc() or kmalloc() to adjust the size of the buffer
  * to what is needed.
  *
  * ip -- the inode whose if_data area is changing