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libzfs: add zfs_mount_at() function

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zfs_mount_at() mounts a dataset at an arbitrary mountpoint rather than
at the configured mountpoint. This may be used by consumers that wish to
temporarily expose a dataset at another mountpoint without altering
dataset/pool properties.

This will be used by FreeBSD's libbe be_mount(), which mounts a boot
environment at an arbitrary mountpoint.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Ryan Moeller <ryan@ixsystems.com>
Signed-off-by: Kyle Evans <kevans@FreeBSD.org>
Closes #9833
This commit is contained in:
Kyle Evans
2020-01-14 10:49:54 -06:00
committed by Brian Behlendorf
parent e458fcca75
commit 68a192e4b7
2 changed files with 38 additions and 8 deletions
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include/libzfs.h
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@@ -788,6 +788,7 @@ extern boolean_t zfs_bookmark_exists(const char *path);
extern boolean_t is_mounted(libzfs_handle_t *, const char *special, char **);
extern boolean_t zfs_is_mounted(zfs_handle_t *, char **);
extern int zfs_mount(zfs_handle_t *, const char *, int);
extern int zfs_mount_at(zfs_handle_t *, const char *, int, const char *);
extern int zfs_unmount(zfs_handle_t *, const char *, int);
extern int zfs_unmountall(zfs_handle_t *, int);