| Message ID | 20161123044816.GG16807@birch.djwong.org (mailing list archive) |
|---|---|
| State | Not Applicable |
| Headers | show |
On 11/23/2016 05:48 AM, Darrick J. Wong wrote: > Fix the discussion of the limitations on the dest_count and src_length > parameters to the fideduperange ioctl to reflect what's actually in the > kernel. Thanks Darrick. Applied. Cheers, Michael > Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> > --- > man2/ioctl_fideduperange.2 | 20 +++++++++++++++++--- > 1 file changed, 17 insertions(+), 3 deletions(-) > > diff --git a/man2/ioctl_fideduperange.2 b/man2/ioctl_fideduperange.2 > index 2112d10..057229d 100644 > --- a/man2/ioctl_fideduperange.2 > +++ b/man2/ioctl_fideduperange.2 > @@ -95,7 +95,7 @@ struct file_dedupe_range_info { > .in > > Each deduplication operation targets > -.IR length > +.IR src_length > bytes in file descriptor > .IR dest_fd > at offset > @@ -108,8 +108,15 @@ During the call, > 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. > +The combined size of the struct > +.IR file_dedupe_range > +and the struct > +.IR file_dedupe_range_info > +array must not exceed the system page size. > +The maximum size of > +.IR src_length > +is filesystem dependent and is typically 16MiB. > +This limit will be enforced silently by the filesystem. > By convention, the storage used by > .IR src_fd > is mapped into > @@ -144,6 +151,13 @@ is set to indicate the error. > .SH ERRORS > Error codes can be one of, but are not limited to, the following: > .TP > +.B ENOMEM > +The kernel was unable to allocate sufficient memory to perform the > +operation or > +.IR dest_count > +is so large that the input argument description spans more than a single > +page of memory. > +.TP > .B EBADF > .IR src_fd > is not open for reading; > . >
On 11/23/2016 05:49 AM, Omar Sandoval wrote: > On Tue, Nov 22, 2016 at 08:48:16PM -0800, Darrick J. Wong wrote: >> Fix the discussion of the limitations on the dest_count and src_length >> parameters to the fideduperange ioctl to reflect what's actually in the >> kernel. >> >> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> >> --- >> man2/ioctl_fideduperange.2 | 20 +++++++++++++++++--- >> 1 file changed, 17 insertions(+), 3 deletions(-) >> >> diff --git a/man2/ioctl_fideduperange.2 b/man2/ioctl_fideduperange.2 >> index 2112d10..057229d 100644 >> --- a/man2/ioctl_fideduperange.2 >> +++ b/man2/ioctl_fideduperange.2 [...] > Reviewed-by: Omar Sandoval <osandov@fb.com> Thanks Omar! Cheers, Michael
diff --git a/man2/ioctl_fideduperange.2 b/man2/ioctl_fideduperange.2 index 2112d10..057229d 100644 --- a/man2/ioctl_fideduperange.2 +++ b/man2/ioctl_fideduperange.2 @@ -95,7 +95,7 @@ struct file_dedupe_range_info { .in Each deduplication operation targets -.IR length +.IR src_length bytes in file descriptor .IR dest_fd at offset @@ -108,8 +108,15 @@ During the call, 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. +The combined size of the struct +.IR file_dedupe_range +and the struct +.IR file_dedupe_range_info +array must not exceed the system page size. +The maximum size of +.IR src_length +is filesystem dependent and is typically 16MiB. +This limit will be enforced silently by the filesystem. By convention, the storage used by .IR src_fd is mapped into @@ -144,6 +151,13 @@ is set to indicate the error. .SH ERRORS Error codes can be one of, but are not limited to, the following: .TP +.B ENOMEM +The kernel was unable to allocate sufficient memory to perform the +operation or +.IR dest_count +is so large that the input argument description spans more than a single +page of memory. +.TP .B EBADF .IR src_fd is not open for reading;
Fix the discussion of the limitations on the dest_count and src_length parameters to the fideduperange ioctl to reflect what's actually in the kernel. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> --- man2/ioctl_fideduperange.2 | 20 +++++++++++++++++--- 1 file changed, 17 insertions(+), 3 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe linux-xfs" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html