# \[PATCH\] ioctl\_ficlonerange.2/ioctl\_fideduperange.2: mention same-fs requirement

- From: Darrick J. Wong \<hidden\>
- Date: 2016-06-08 16:41:11 
- List: linux-api
- Page: https://ratatoskr.run/linux-api/2016/06/109118
- Thread: https://ratatoskr.run/linux-fsdevel/2016/06/109118/t.md

```text
Mention that FICLONE, FICLONERANGE, and FIDEDUPERANGE all require both
files to reside on the same filesystem.

Signed-off-by: Darrick J. Wong <redacted>
---
 man2/ioctl_ficlonerange.2  |    1 +
 man2/ioctl_fideduperange.2 |    1 +
 2 files changed, 2 insertions(+)

diff --git a/man2/ioctl_ficlonerange.2 b/man2/ioctl_ficlonerange.2
index 0cb1567..c6e0762 100644
--- a/man2/ioctl_ficlonerange.2
+++ b/man2/ioctl_ficlonerange.2
@@ -36,6 +36,7 @@ file appear in the
 .I dest_fd
 file by sharing the underlying storage, which is faster than making a separate
 physical copy of the data.
+Both files must reside within the same filesystem.
 If a file write should occur to a shared region,
 the filesystem must ensure that the changes remain private to the file being
 written.
diff --git a/man2/ioctl_fideduperange.2 b/man2/ioctl_fideduperange.2
index c69f8c5..44a7765 100644
--- a/man2/ioctl_fideduperange.2
+++ b/man2/ioctl_fideduperange.2
@@ -34,6 +34,7 @@ file appear in the
 .B dest_fd
 file by sharing the underlying storage if the file data is identical
 ("deduplication").
+Both files must reside within the same filesystem.
 This reduces storage consumption by allowing the filesystem
 to store one shared copy of the data.
 If a file write should occur to a shared
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```