On 2026/7/11 15:10, Giuseppe Scrivano wrote:
Add fsparam_fd("source") so that userspace can pass an already-opened
file descriptor instead of a path string. When the fd is provided via
fsconfig(FSCONFIG_SET_FD, "source", NULL, fd), it is stored directly
in sbi->dif0.file and erofs_fc_get_tree() skips the filp_open() call.
This is useful for mount namespaces where the backing file may not be
reachable by path, and for tools that already hold an fd to the image
(e.g. composefs reusing an erofs mount's backing file).
Signed-off-by: Giuseppe Scrivano <[email protected]>
Reviewed-by: Gao Xiang <[email protected]>
Thanks,
Gao Xiang
