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sys/mount.h: Comment on distinction between vfs_{c,}mount

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Hope to save someone else a little future effort in ugly duplicated code.

No functional change.
This commit is contained in:
Conrad Meyer 2019-09-05 00:56:37 +00:00
parent 2e67077700
commit 58aa4dbf4a
1 changed files with 12 additions and 0 deletions
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12
sys/sys/mount.h
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@ -651,6 +651,18 @@ struct nameidata;
struct sysctl_req;
struct mntarg;
/*
* N.B., vfs_cmount is the ancient vfsop invoked by the old mount(2) syscall.
* The new way is vfs_mount.
*
* vfs_cmount implementations typically translate arguments from their
* respective old per-FS structures into the key-value list supported by
* nmount(2), then use kernel_mount(9) to mimic nmount(2) from kernelspace.
*
* Filesystems with mounters that use nmount(2) do not need to and should not
* implement vfs_cmount. Hopefully a future cleanup can remove vfs_cmount and
* mount(2) entirely.
*/
typedef int vfs_cmount_t(struct mntarg *ma, void *data, uint64_t flags);
typedef int vfs_unmount_t(struct mount *mp, int mntflags);
typedef int vfs_root_t(struct mount *mp, int flags, struct vnode **vpp);