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loop.4: Document LOOP_CONFIGURE ioctl 

Signed-off-by: Yang Xu <xuyang2018.jy@cn.fujitsu.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Yang Xu 2020-09-09 20:05:56 +08:00 committed by Michael Kerrisk
parent e38283d738
commit 06df754f52
1 changed files with 43 additions and 0 deletions
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@ -178,6 +178,49 @@ This value must be a power of two in the range
otherwise, an
.B EINVAL
error results.
.TP
.BR LOOP_CONFIGURE " (since Linux 5.8)"
.\" commit 3448914e8cc550ba792d4ccc74471d1ca4293aae
Setup and configure all loop device parameters in a single step using
the (third)
.BR ioctl (2)
argument.
This argument is a pointer to a
.I loop_config
structure, defined in
.I <linux/loop.h>
as:
.IP
.in +4n
.EX
struct loop_config {
__u32 fd;
__u32 block_size;
struct loop_info64 info;
__u64 __reserved[8];
};
.EE
.in
.IP
In addition to doing what
.BR LOOP_SET_STATUS
can do,
.BR LOOP_CONFIGURE
can also be used to the following:
.RS
.IP * 2
Set the correct block size immediately by setting
.IR loop_config.block_size.
.IP *
Explicitly request direct I/O mode by setting
.BR LO_FLAGS_DIRECT_IO
in loop_config.info.lo_flags.
.IP *
Explicitly request read-only mode by setting
.BR LO_FLAGS_READ_ONLY
in
.IR loop_config.info.lo_flags.
.RE
.PP
Since Linux 2.6, there are two new
.BR ioctl (2)