btrfs: add .copy_file_range file operation

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This rearranges the existing COPY_RANGE ioctl implementation so that the
.copy_file_range file operation can call the core loop that copies file
data extent items.

The extent copying loop is lifted up into its own function.  It retains
the core btrfs error checks that should be shared.

Signed-off-by: Zach Brown <zab@redhat.com>
[Anna Schumaker: Make flags an unsigned int,
                 Check for COPY_FR_REFLINK]
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Reviewed-by: Josef Bacik <jbacik@fb.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

...

This commit is contained in:

Zach Brown 2015-11-10 16:53:32 -05:00 • committed by Al Viro

parent cb4c4e8091

commit 3db11b2eec

3 changed files with 56 additions and 39 deletions

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3

fs/btrfs/ctree.h

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1

fs/btrfs/file.c

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91

fs/btrfs/ioctl.c

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