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From:   Kanchan Joshi <joshi.k@samsung.com>
To:     Jens Axboe <axboe@kernel.dk>, Jonathan Corbet <corbet@lwn.net>,
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Cc:     martin.petersen@oracle.com, linux-scsi@vger.kernel.org,
        nitheshshetty@gmail.com, anuj1072538@gmail.com,
        gost.dev@samsung.com, mcgrof@kernel.org,
        Anuj Gupta <anuj20.g@samsung.com>,
        Hannes Reinecke <hare@suse.de>,
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        linux-fsdevel@vger.kernel.org
Subject: [PATCH v18 05/12] fs/read_write: Enable copy_file_range for block
 device.
Date:   Wed,  6 Dec 2023 15:32:37 +0530
Message-Id: <20231206100253.13100-6-joshi.k@samsung.com>
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        <CGME20231206101133epcas5p28efae88fbc435e0a42bc89c94eec3ac2@epcas5p2.samsung.com>
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From: Anuj Gupta <anuj20.g@samsung.com>

This is a prep patch. Allow copy_file_range to work for block devices.
Relaxing generic_copy_file_checks allows us to reuse the existing infra,
instead of adding a new user interface for block copy offload.
Change generic_copy_file_checks to use ->f_mapping->host for both inode_in
and inode_out. Allow block device in generic_file_rw_checks.

Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Anuj Gupta <anuj20.g@samsung.com>
Signed-off-by: Nitesh Shetty <nj.shetty@samsung.com>
---
 fs/read_write.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/fs/read_write.c b/fs/read_write.c
index e0c2c1b5962b..92729c7547d3 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -1441,8 +1441,8 @@ static int generic_copy_file_checks(struct file *file_in, loff_t pos_in,
 				    struct file *file_out, loff_t pos_out,
 				    size_t *req_count, unsigned int flags)
 {
-	struct inode *inode_in = file_inode(file_in);
-	struct inode *inode_out = file_inode(file_out);
+	struct inode *inode_in = file_in->f_mapping->host;
+	struct inode *inode_out = file_out->f_mapping->host;
 	uint64_t count = *req_count;
 	loff_t size_in;
 	int ret;
@@ -1750,7 +1750,9 @@ int generic_file_rw_checks(struct file *file_in, struct file *file_out)
 	/* Don't copy dirs, pipes, sockets... */
 	if (S_ISDIR(inode_in->i_mode) || S_ISDIR(inode_out->i_mode))
 		return -EISDIR;
-	if (!S_ISREG(inode_in->i_mode) || !S_ISREG(inode_out->i_mode))
+	if (!S_ISREG(inode_in->i_mode) && !S_ISBLK(inode_in->i_mode))
+		return -EINVAL;
+	if ((inode_in->i_mode & S_IFMT) != (inode_out->i_mode & S_IFMT))
 		return -EINVAL;
 
 	if (!(file_in->f_mode & FMODE_READ) ||
-- 
2.35.1.500.gb896f729e2