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ioctl_ficlonerange.2, ioctl_fideduperange.2: Clarify the behavior of the FIDEDUPERANGE ioctl 

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
This commit is contained in:
Darrick J. Wong 2016-10-17 18:54:35 -07:00 committed by Michael Kerrisk
parent 63a599c657
commit 2046b8ac01
2 changed files with 23 additions and 5 deletions
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2
man2/ioctl_ficlonerange.2
View File

@ -114,7 +114,7 @@ regions in directories.
.TP
.B EOPNOTSUPP
This can appear if the filesystem does not support reflinking either file
descriptor.
descriptor, or if either file descriptor refers to special inodes.
.TP
.B EPERM
.IR dest_fd

26
man2/ioctl_fideduperange.2
View File

@ -99,21 +99,39 @@ Each deduplication operation targets
bytes in file descriptor
.IR dest_fd
at offset
.IR logical_offset ".
.IR dest_offset ".
The field
.IR reserved
must be zero.
During the call,
.IR src_fd
must be open for reading and
.IR dest_fd
must be open for writing.
For any call to this ioctl, there may not be more than 65,536
requests attached; each request may not exceed 16MiB.
By convention, the storage used by
.IR src_fd
is mapped into
.IR dest_fd
and the previous contents in
.IR dest_fd
are freed.
Upon successful completion of this ioctl, the number of bytes successfully
deduplicated is returned in
.IR bytes_deduped
and a status code for the deduplication operation is returned in
.IR status ".
If even a single byte in the range does not match, the deduplication
request will be ignored and
.IR status
set to
.BR FILE_DEDUPE_RANGE_DIFFERS .
The
.IR status
code is set to
.B 0
.B FILE_DEDUPE_RANGE_SAME
for success, a negative error code in case of error, or
.B FILE_DEDUPE_RANGE_DIFFERS
if the data did not match.
@ -150,7 +168,7 @@ regions in directories.
.TP
.B EOPNOTSUPP
This can appear if the filesystem does not support deduplicating either file
descriptor.
descriptor, or if either file descriptor refers to special inodes.
.TP
.B EPERM
.IR dest_fd