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[RFC,1/1] fs: ext4: Don't use CMA for buffer_head

Message ID 20240821112254.624814-1-zhaoyang.huang@unisoc.com
State Rejected
Headers show
Series [RFC,1/1] fs: ext4: Don't use CMA for buffer_head | expand

Commit Message

zhaoyang.huang Aug. 21, 2024, 11:22 a.m. UTC 
From: Zhaoyang Huang <zhaoyang.huang@unisoc.com>

cma_alloc() keep failed in our system which thanks to a jh->bh->b_page
can not be migrated out of CMA area as the jh has one cp_transaction
pending on it. We solve this by launching jbd2_log_do_checkpoint forcefully
somewhere. Since journal is common mechanism to all JFSs and
cp_transaction has a little fewer opportunity to be launched, this patch
would like to have buffer_head of ext4 not use CMA pages.

Signed-off-by: Zhaoyang Huang <zhaoyang.huang@unisoc.com>
---
 fs/ext4/inode.c | 4 ++++
 1 file changed, 4 insertions(+)
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Patch

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 941c1c0d5c6e..4422246851fe 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -869,7 +869,11 @@  struct buffer_head *ext4_getblk(handle_t *handle, struct inode *inode,
 	if (nowait)
 		return sb_find_get_block(inode->i_sb, map.m_pblk);
 
+#ifndef CONFIG_CMA
 	bh = sb_getblk(inode->i_sb, map.m_pblk);
+#else
+	bh = sb_getblk_gfp(inode->i_sb, map.m_pblk, 0);
+#endif
 	if (unlikely(!bh))
 		return ERR_PTR(-ENOMEM);
 	if (map.m_flags & EXT4_MAP_NEW) {