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From: Goldwyn Rodrigues <rgoldwyn@suse.de>
To: viro@ZenIV.linux.org.uk
Cc: linux-fsdevel@vger.kernel.org, Goldwyn Rodrigues <rgoldwyn@suse.com>
Subject: [PATCH 4/4] ovl: Use do_copy_file_range() in copy_up_data()
Date: Thu, 14 Jun 2018 10:12:36 -0500	[thread overview]
Message-ID: <20180614151236.26814-5-rgoldwyn@suse.de> (raw)
In-Reply-To: <20180614151236.26814-1-rgoldwyn@suse.de>

From: Goldwyn Rodrigues <rgoldwyn@suse.com>

This will preserve the holes by copying the chunks of data.
If available it will use clone().

Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
Reviewed-by: Amir Goldstein <amir73il@gmail.com>
---
 fs/overlayfs/copy_up.c | 28 ++++++++--------------------
 fs/read_write.c        |  8 +++++---
 include/linux/fs.h     |  3 +++
 3 files changed, 16 insertions(+), 23 deletions(-)

diff --git a/fs/overlayfs/copy_up.c b/fs/overlayfs/copy_up.c
index 8bede0742619..1f89380873ce 100644
--- a/fs/overlayfs/copy_up.c
+++ b/fs/overlayfs/copy_up.c
@@ -138,8 +138,7 @@ static int ovl_copy_up_data(struct path *old, struct path *new, loff_t len)
 {
 	struct file *old_file;
 	struct file *new_file;
-	loff_t old_pos = 0;
-	loff_t new_pos = 0;
+	loff_t pos = 0;
 	int error = 0;
 
 	if (len == 0)
@@ -155,38 +154,27 @@ static int ovl_copy_up_data(struct path *old, struct path *new, loff_t len)
 		goto out_fput;
 	}
 
-	/* Try to use clone_file_range to clone up within the same fs */
-	error = vfs_clone_file_range(old_file, 0, new_file, 0, len);
-	if (!error)
-		goto out;
-	/* Couldn't clone, so now we try to copy the data */
-	error = 0;
-
-	/* FIXME: copy up sparse files efficiently */
-	while (len) {
+	while (pos < len) {
 		size_t this_len = OVL_COPY_UP_CHUNK_SIZE;
 		long bytes;
 
-		if (len < this_len)
-			this_len = len;
+		if (len - pos < this_len)
+			this_len = len - pos;
 
 		if (signal_pending_state(TASK_KILLABLE, current)) {
 			error = -EINTR;
 			break;
 		}
 
-		bytes = do_splice_direct(old_file, &old_pos,
-					 new_file, &new_pos,
-					 this_len, SPLICE_F_MOVE);
+		bytes = do_copy_file_range(old_file, pos,
+					 new_file, pos,
+					 this_len, 0, SPLICE_F_MOVE);
 		if (bytes <= 0) {
 			error = bytes;
 			break;
 		}
-		WARN_ON(old_pos != new_pos);
-
-		len -= bytes;
+		pos += bytes;
 	}
-out:
 	if (!error)
 		error = vfs_fsync(new_file, 0);
 	fput(new_file);
diff --git a/fs/read_write.c b/fs/read_write.c
index 3c6a13101e6e..069fc397e080 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -1542,9 +1542,10 @@ COMPAT_SYSCALL_DEFINE4(sendfile64, int, out_fd, int, in_fd,
 }
 #endif
 
-static ssize_t do_copy_file_range(struct file *file_in, loff_t pos_in,
+ssize_t do_copy_file_range(struct file *file_in, loff_t pos_in,
 			    struct file *file_out, loff_t pos_out,
-			    size_t len, unsigned int flags)
+			    size_t len, unsigned int flags,
+			    unsigned int splice_flags)
 {
 	struct inode *inode_in = file_inode(file_in);
 	struct inode *inode_out = file_inode(file_out);
@@ -1629,6 +1630,7 @@ static ssize_t do_copy_file_range(struct file *file_in, loff_t pos_in,
 out:
 	return total ? total : ret;
 }
+EXPORT_SYMBOL(do_copy_file_range);
 
 /*
  * copy_file_range() differs from regular file read and write in that it
@@ -1667,7 +1669,7 @@ ssize_t vfs_copy_file_range(struct file *file_in, loff_t pos_in,
 	file_start_write(file_out);
 
 	ret = do_copy_file_range(file_in, pos_in,
-			file_out, pos_out, len, flags);
+			file_out, pos_out, len, flags, 0);
 
 	if (ret > 0) {
 		fsnotify_access(file_in);
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 760d8da1b6c7..d5349b17fa10 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1799,6 +1799,9 @@ extern ssize_t vfs_read(struct file *, char __user *, size_t, loff_t *);
 extern ssize_t vfs_write(struct file *, const char __user *, size_t, loff_t *);
 extern ssize_t vfs_readv(struct file *, const struct iovec __user *,
 		unsigned long, loff_t *, rwf_t);
+extern ssize_t do_copy_file_range(struct file *, loff_t , struct file *,
+				   loff_t , size_t, unsigned int,
+				   unsigned int);
 extern ssize_t vfs_copy_file_range(struct file *, loff_t , struct file *,
 				   loff_t, size_t, unsigned int);
 extern int vfs_clone_file_prep_inodes(struct inode *inode_in, loff_t pos_in,
-- 
2.16.3

  parent reply	other threads:[~2018-06-14 15:12 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-06-14 15:12 [PATCH RESEND v3 0/4] Enable holes in copy_file_range() Goldwyn Rodrigues
2018-06-14 15:12 ` [PATCH 1/4] copy_file_range: refactor vfs_copy_file_range Goldwyn Rodrigues
2018-06-14 15:12 ` [PATCH 2/4] copy_file_range: Perform splice if in/out SB are not same Goldwyn Rodrigues
2018-06-14 15:12 ` [PATCH 3/4] copy_file_range: splice with holes Goldwyn Rodrigues
2018-06-30 18:01   ` Steve French
2018-06-14 15:12 ` Goldwyn Rodrigues [this message]
  -- strict thread matches above, loose matches on Subject: below --
2018-05-14 14:56 [PATCH v3 0/4] Enable holes in copy_file_range() Goldwyn Rodrigues
2018-05-14 14:56 ` [PATCH 4/4] ovl: Use do_copy_file_range() in copy_up_data() Goldwyn Rodrigues
2018-05-10  1:58 [PATCH v2 0/4] Enable holes in copy_file_range() Goldwyn Rodrigues
2018-05-10  1:58 ` [PATCH 4/4] ovl: Use do_copy_file_range() in copy_up_data() Goldwyn Rodrigues
2018-05-08 21:24 [PATCH v1 0/5] Enable holes on copy_file_range() Goldwyn Rodrigues
2018-05-08 21:24 ` [PATCH 4/4] ovl: Use do_copy_file_range() in copy_up_data() Goldwyn Rodrigues
2018-05-09  5:50   ` Amir Goldstein
2018-05-09 19:13     ` Goldwyn Rodrigues
2018-05-10  4:52       ` Amir Goldstein

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