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From: Martijn Coenen <maco@android.com>
To: axboe@kernel.dk, hch@lst.de, ming.lei@redhat.com
Cc: narayan@google.com, zezeozue@google.com, kernel-team@android.com,
	linux-block@vger.kernel.org, linux-kernel@vger.kernel.org,
	maco@google.com, bvanassche@acm.org, Chaitanya.Kulkarni@wdc.com,
	Martijn Coenen <maco@android.com>
Subject: [PATCH 2/4] loop: Factor out configuring loop from status.
Date: Mon, 20 Apr 2020 10:04:07 +0200	[thread overview]
Message-ID: <20200420080409.111693-3-maco@android.com> (raw)
In-Reply-To: <20200420080409.111693-1-maco@android.com>

Factor out this code into a separate function, so it can be reused by
other code more easily.

Signed-off-by: Martijn Coenen <maco@android.com>
---
 drivers/block/loop.c | 108 +++++++++++++++++++++++--------------------
 1 file changed, 58 insertions(+), 50 deletions(-)

diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index d934d65dbe92..e0f9674fe568 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -1276,12 +1276,68 @@ static int loop_clr_fd(struct loop_device *lo)
 }
 
 static int
-loop_set_status(struct loop_device *lo, const struct loop_info64 *info)
+loop_set_from_status(struct loop_device *lo, const struct loop_info64 *info)
 {
 	int err;
 	struct loop_func_table *xfer;
 	kuid_t uid = current_uid();
+
+	if ((unsigned int) info->lo_encrypt_key_size > LO_KEY_SIZE)
+		return -EINVAL;
+
+	err = loop_release_xfer(lo);
+	if (err)
+		return err;
+
+	if (info->lo_encrypt_type) {
+		unsigned int type = info->lo_encrypt_type;
+
+		if (type >= MAX_LO_CRYPT)
+			return -EINVAL;
+		xfer = xfer_funcs[type];
+		if (xfer == NULL)
+			return -EINVAL;
+	} else
+		xfer = NULL;
+
+	err = loop_init_xfer(lo, xfer, info);
+	if (err)
+		return err;
+
+	lo->lo_offset = info->lo_offset;
+	lo->lo_sizelimit = info->lo_sizelimit;
+	memcpy(lo->lo_file_name, info->lo_file_name, LO_NAME_SIZE);
+	memcpy(lo->lo_crypt_name, info->lo_crypt_name, LO_NAME_SIZE);
+	lo->lo_file_name[LO_NAME_SIZE-1] = 0;
+	lo->lo_crypt_name[LO_NAME_SIZE-1] = 0;
+
+	if (!xfer)
+		xfer = &none_funcs;
+	lo->transfer = xfer->transfer;
+	lo->ioctl = xfer->ioctl;
+
+	if ((lo->lo_flags & LO_FLAGS_AUTOCLEAR) !=
+	     (info->lo_flags & LO_FLAGS_AUTOCLEAR))
+		lo->lo_flags ^= LO_FLAGS_AUTOCLEAR;
+
+	lo->lo_encrypt_key_size = info->lo_encrypt_key_size;
+	lo->lo_init[0] = info->lo_init[0];
+	lo->lo_init[1] = info->lo_init[1];
+	if (info->lo_encrypt_key_size) {
+		memcpy(lo->lo_encrypt_key, info->lo_encrypt_key,
+		       info->lo_encrypt_key_size);
+		lo->lo_key_owner = uid;
+	}
+
+	return 0;
+}
+
+static int
+loop_set_status(struct loop_device *lo, const struct loop_info64 *info)
+{
+	int err;
 	struct block_device *bdev;
+	kuid_t uid = current_uid();
 	bool partscan = false;
 	bool size_changed = false;
 	loff_t validated_size;
@@ -1299,10 +1355,6 @@ loop_set_status(struct loop_device *lo, const struct loop_info64 *info)
 		err = -ENXIO;
 		goto out_unlock;
 	}
-	if ((unsigned int) info->lo_encrypt_key_size > LO_KEY_SIZE) {
-		err = -EINVAL;
-		goto out_unlock;
-	}
 
 	if (lo->lo_offset != info->lo_offset ||
 	    lo->lo_sizelimit != info->lo_sizelimit) {
@@ -1330,54 +1382,10 @@ loop_set_status(struct loop_device *lo, const struct loop_info64 *info)
 		goto out_unfreeze;
 	}
 
-	err = loop_release_xfer(lo);
-	if (err)
-		goto out_unfreeze;
-
-	if (info->lo_encrypt_type) {
-		unsigned int type = info->lo_encrypt_type;
-
-		if (type >= MAX_LO_CRYPT) {
-			err = -EINVAL;
-			goto out_unfreeze;
-		}
-		xfer = xfer_funcs[type];
-		if (xfer == NULL) {
-			err = -EINVAL;
-			goto out_unfreeze;
-		}
-	} else
-		xfer = NULL;
-
-	err = loop_init_xfer(lo, xfer, info);
+	err = loop_set_from_status(lo, info);
 	if (err)
 		goto out_unfreeze;
 
-	lo->lo_offset = info->lo_offset;
-	lo->lo_sizelimit = info->lo_sizelimit;
-	memcpy(lo->lo_file_name, info->lo_file_name, LO_NAME_SIZE);
-	memcpy(lo->lo_crypt_name, info->lo_crypt_name, LO_NAME_SIZE);
-	lo->lo_file_name[LO_NAME_SIZE-1] = 0;
-	lo->lo_crypt_name[LO_NAME_SIZE-1] = 0;
-
-	if (!xfer)
-		xfer = &none_funcs;
-	lo->transfer = xfer->transfer;
-	lo->ioctl = xfer->ioctl;
-
-	if ((lo->lo_flags & LO_FLAGS_AUTOCLEAR) !=
-	     (info->lo_flags & LO_FLAGS_AUTOCLEAR))
-		lo->lo_flags ^= LO_FLAGS_AUTOCLEAR;
-
-	lo->lo_encrypt_key_size = info->lo_encrypt_key_size;
-	lo->lo_init[0] = info->lo_init[0];
-	lo->lo_init[1] = info->lo_init[1];
-	if (info->lo_encrypt_key_size) {
-		memcpy(lo->lo_encrypt_key, info->lo_encrypt_key,
-		       info->lo_encrypt_key_size);
-		lo->lo_key_owner = uid;
-	}
-
 	if (size_changed)
 		loop_set_size(lo, validated_size);
 
-- 
2.26.1.301.g55bc3eb7cb9-goog


  parent reply	other threads:[~2020-04-20  8:05 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-20  8:04 [PATCH 0/4] Add a new LOOP_SET_FD_AND_STATUS ioctl Martijn Coenen
2020-04-20  8:04 ` [PATCH 1/4] loop: Refactor size calculation Martijn Coenen
2020-04-20 13:22   ` Bart Van Assche
2020-04-21 11:48     ` Martijn Coenen
2020-04-21 15:26       ` Bart Van Assche
2020-04-20  8:04 ` Martijn Coenen [this message]
2020-04-20 13:34   ` [PATCH 2/4] loop: Factor out configuring loop from status Bart Van Assche
2020-04-20 13:49   ` Bart Van Assche
2020-04-21 11:46     ` Martijn Coenen
2020-04-20  8:04 ` [PATCH 3/4] loop: Move loop_set_from_status() and friends up Martijn Coenen
2020-04-20 13:43   ` Bart Van Assche
2020-04-20  8:04 ` [PATCH 4/4] loop: Add LOOP_SET_FD_AND_STATUS ioctl Martijn Coenen
2020-04-22  6:19   ` Christoph Hellwig
2020-04-22  8:06     ` Martijn Coenen
2020-04-22  8:07       ` Christoph Hellwig
2020-04-22 15:10   ` Bart Van Assche
2020-04-27  7:42     ` Martijn Coenen

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