Re: [PATCH v3] fuse: Add support for passthrough read/write
From: Jann Horn <hidden>
Date: 2016-01-20 23:38:39
Also in:
linux-fsdevel, lkml
On Wed, Jan 20, 2016 at 03:20:34PM -0800, Nikhilesh Reddy wrote:
Add support for filesystem passthrough read/write of files when enabled in userspace through the option FUSE_PASSTHROUGH.
[...]
quoted hunk ↗ jump to hunk
+ daemon_fd = (int)open_out->passthrough_fd; + if (daemon_fd < 0) + return; + + passthrough_filp = fget_raw(daemon_fd); + if (!passthrough_filp) + return; + + passthrough_inode = file_inode(passthrough_filp); + passthrough_sb = passthrough_inode->i_sb; + fs_stack_depth = passthrough_sb->s_stack_depth + 1; + + /* If we reached the stacking limit go through regular io */ + if (fs_stack_depth > FILESYSTEM_MAX_STACK_DEPTH) { + pr_err("FUSE: maximum fs stacking depth exceeded, cannot use passthrough for this file\n"); + return; + }
I think this needs an fput() in the error case to prevent a refcount leak.
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