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| author | Christian Brauner <brauner@kernel.org> | 2024-10-14 11:40:58 +0200 |
|---|---|---|
| committer | Christian Brauner <brauner@kernel.org> | 2024-10-14 16:31:16 +0200 |
| commit | a89ed67d3c2423069ff2389c89a8a83fbc36bba6 (patch) | |
| tree | a3469af459657ec1110dfc6f23d932084edc0c16 /Documentation/filesystems | |
| parent | a08557d19ef41439feaa3137687d8b317c1a359a (diff) | |
Documentation,ovl: document new file descriptor based layers
Add a minimal example how to specify layers via file descriptors.
Link: https://lore.kernel.org/r/20241014-work-overlayfs-v3-3-32b3fed1286e@kernel.org
Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>
Diffstat (limited to 'Documentation/filesystems')
| -rw-r--r-- | Documentation/filesystems/overlayfs.rst | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/Documentation/filesystems/overlayfs.rst b/Documentation/filesystems/overlayfs.rst index 343644712340..4c8387e1c880 100644 --- a/Documentation/filesystems/overlayfs.rst +++ b/Documentation/filesystems/overlayfs.rst @@ -440,6 +440,23 @@ For example:: fsconfig(fs_fd, FSCONFIG_SET_STRING, "datadir+", "/do2", 0); +Specifying layers via file descriptors +-------------------------------------- + +Since kernel v6.13, overlayfs supports specifying layers via file descriptors in +addition to specifying them as paths. This feature is available for the +"datadir+", "lowerdir+", "upperdir", and "workdir+" mount options with the +fsconfig syscall from the new mount api:: + + fsconfig(fs_fd, FSCONFIG_SET_FD, "lowerdir+", NULL, fd_lower1); + fsconfig(fs_fd, FSCONFIG_SET_FD, "lowerdir+", NULL, fd_lower2); + fsconfig(fs_fd, FSCONFIG_SET_FD, "lowerdir+", NULL, fd_lower3); + fsconfig(fs_fd, FSCONFIG_SET_FD, "datadir+", NULL, fd_data1); + fsconfig(fs_fd, FSCONFIG_SET_FD, "datadir+", NULL, fd_data2); + fsconfig(fs_fd, FSCONFIG_SET_FD, "workdir", NULL, fd_work); + fsconfig(fs_fd, FSCONFIG_SET_FD, "upperdir", NULL, fd_upper); + + fs-verity support ----------------- |