git: a06c12464bb4 - main - linux(4): Add F_GETPIPE_SZ fcntl operation which returns the capacity of the pipe referred by fd.

[Dmitry Chagin]

The branch main has been updated by dchagin:

URL: 
https://cgit.FreeBSD.org/src/commit/?id=a06c12464bb49750c6b113c971e2770408ce422a

commit a06c12464bb49750c6b113c971e2770408ce422a
Author:     Dmitry Chagin <dcha...@freebsd.org>
AuthorDate: 2021-05-31 19:15:02 +0000
Commit:     Dmitry Chagin <dcha...@freebsd.org>
CommitDate: 2021-05-31 19:15:02 +0000

    linux(4): Add F_GETPIPE_SZ fcntl operation which returns the capacity
    of the pipe referred by fd.
    
    Differential Revision:  https://reviews.freebsd.org/D30517
    MFC after:              2 weeks
---
 sys/compat/linux/linux_file.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/sys/compat/linux/linux_file.c b/sys/compat/linux/linux_file.c
index 0549d536ba51..a6cf467d6219 100644
--- a/sys/compat/linux/linux_file.c
+++ b/sys/compat/linux/linux_file.c
@@ -45,6 +45,8 @@ __FBSDID("$FreeBSD$");
 #include <sys/mount.h>
 #include <sys/mutex.h>
 #include <sys/namei.h>
+#include <sys/selinfo.h>
+#include <sys/pipe.h>
 #include <sys/proc.h>
 #include <sys/stat.h>
 #include <sys/sx.h>
@@ -1524,6 +1526,7 @@ fcntl_common(struct thread *td, struct linux_fcntl_args 
*args)
 {
        struct l_flock linux_flock;
        struct flock bsd_flock;
+       struct pipe *fpipe;
        struct file *fp;
        long arg;
        int error, result;
@@ -1655,6 +1658,21 @@ fcntl_common(struct thread *td, struct linux_fcntl_args 
*args)
        case LINUX_F_ADD_SEALS:
                return (kern_fcntl(td, args->fd, F_ADD_SEALS,
                    linux_to_bsd_bits(args->arg, seal_bitmap, 0)));
+
+       case LINUX_F_GETPIPE_SZ:
+               error = fget(td, args->fd,
+                   &cap_fcntl_rights, &fp);
+               if (error != 0)
+                       return (error);
+               if (fp->f_type != DTYPE_PIPE) {
+                       fdrop(fp, td);
+                       return (EINVAL);
+               }
+               fpipe = fp->f_data;
+               td->td_retval[0] = fpipe->pipe_buffer.size;
+               fdrop(fp, td);
+               return (0);
+
        default:
                linux_msg(td, "unsupported fcntl cmd %d", args->cmd);
                return (EINVAL);
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