linux-kernel - [PATCH v5 19/22] erofs: register cookie context for data blobs

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Date:   Wed, 16 Mar 2022 21:17:20 +0800
From:   Jeffle Xu <jefflexu@...ux.alibaba.com>
To:     dhowells@...hat.com, linux-cachefs@...hat.com, xiang@...nel.org,
        chao@...nel.org, linux-erofs@...ts.ozlabs.org
Cc:     torvalds@...ux-foundation.org, gregkh@...uxfoundation.org,
        willy@...radead.org, linux-fsdevel@...r.kernel.org,
        joseph.qi@...ux.alibaba.com, bo.liu@...ux.alibaba.com,
        tao.peng@...ux.alibaba.com, gerry@...ux.alibaba.com,
        eguan@...ux.alibaba.com, linux-kernel@...r.kernel.org,
        luodaowen.backend@...edance.com
Subject: [PATCH v5 19/22] erofs: register cookie context for data blobs

Similar to the multi device mode, erofs could be mounted from multiple
blob files (one bootstrap blob file and optional multiple data blob
files). In this case, each device slot contains the path of
corresponding data blob file.

This patch registers corresponding cookie context for each data blob
file.

Signed-off-by: Jeffle Xu <jefflexu@...ux.alibaba.com>
---
 fs/erofs/internal.h |  1 +
 fs/erofs/super.c    | 27 +++++++++++++++++++--------
 2 files changed, 20 insertions(+), 8 deletions(-)

diff --git a/fs/erofs/internal.h b/fs/erofs/internal.h
index f94a921eff98..d93de8b6ff44 100644
--- a/fs/erofs/internal.h
+++ b/fs/erofs/internal.h
@@ -53,6 +53,7 @@ struct erofs_device_info {
 	struct block_device *bdev;
 	struct dax_device *dax_dev;
 	u64 dax_part_off;
+	struct erofs_fscache_context *ctx;
 
 	u32 blocks;
 	u32 mapped_blkaddr;
diff --git a/fs/erofs/super.c b/fs/erofs/super.c
index 8c5783c6f71f..f058a04a00c7 100644
--- a/fs/erofs/super.c
+++ b/fs/erofs/super.c
@@ -250,6 +250,7 @@ static int erofs_init_devices(struct super_block *sb,
 	down_read(&sbi->devs->rwsem);
 	idr_for_each_entry(&sbi->devs->tree, dif, id) {
 		struct block_device *bdev;
+		struct erofs_fscache_context *ctx;
 
 		ptr = erofs_read_metabuf(&buf, sb, erofs_blknr(pos),
 					 EROFS_KMAP);
@@ -259,15 +260,24 @@ static int erofs_init_devices(struct super_block *sb,
 		}
 		dis = ptr + erofs_blkoff(pos);
 
-		bdev = blkdev_get_by_path(dif->path,
-					  FMODE_READ | FMODE_EXCL,
-					  sb->s_type);
-		if (IS_ERR(bdev)) {
-			err = PTR_ERR(bdev);
-			break;
+		if (erofs_bdev_mode(sb)) {
+			bdev = blkdev_get_by_path(dif->path,
+						  FMODE_READ | FMODE_EXCL,
+						  sb->s_type);
+			if (IS_ERR(bdev)) {
+				err = PTR_ERR(bdev);
+				break;
+			}
+			dif->bdev = bdev;
+			dif->dax_dev = fs_dax_get_by_bdev(bdev, &dif->dax_part_off);
+		} else {
+			ctx = erofs_fscache_get_ctx(sb, dif->path, false);
+			if (IS_ERR(ctx)) {
+				err = PTR_ERR(ctx);
+				break;
+			}
+			dif->ctx = ctx;
 		}
-		dif->bdev = bdev;
-		dif->dax_dev = fs_dax_get_by_bdev(bdev, &dif->dax_part_off);
 		dif->blocks = le32_to_cpu(dis->blocks);
 		dif->mapped_blkaddr = le32_to_cpu(dis->mapped_blkaddr);
 		sbi->total_blocks += dif->blocks;
@@ -694,6 +704,7 @@ static int erofs_release_device_info(int id, void *ptr, void *data)
 {
 	struct erofs_device_info *dif = ptr;
 
+	erofs_fscache_put_ctx(dif->ctx);
 	fs_put_dax(dif->dax_dev);
 	if (dif->bdev)
 		blkdev_put(dif->bdev, FMODE_READ | FMODE_EXCL);
-- 
2.27.0