| Message ID | 20230716-fixes-overly-restrictive-mmap-v4-1-a3cd1cd32af2@kernel.org (mailing list archive) |
|---|---|
| State | Awaiting Upstream |
| Headers | show |
| Series | fs/9p: fix mmap regression | expand |
diff --git a/fs/9p/vfs_file.c b/fs/9p/vfs_file.c index 2996fb00387f..9b61b480a9b0 100644 --- a/fs/9p/vfs_file.c +++ b/fs/9p/vfs_file.c @@ -505,9 +505,7 @@ v9fs_file_mmap(struct file *filp, struct vm_area_struct *vma) p9_debug(P9_DEBUG_MMAP, "filp :%p\n", filp); if (!(v9ses->cache & CACHE_WRITEBACK)) { - p9_debug(P9_DEBUG_CACHE, "(no mmap mode)"); - if (vma->vm_flags & VM_MAYSHARE) - return -ENODEV; + p9_debug(P9_DEBUG_CACHE, "(read-only mmap mode)"); invalidate_inode_pages2(filp->f_mapping); return generic_file_readonly_mmap(filp, vma); }
This eliminates a check for shared that was overrestrictive and prevented read-only mmaps when writeback caches weren't enabled. Cc: stable@vger.kernel.org Fixes: 1543b4c5071c ("fs/9p: remove writeback fid and fix per-file modes") Reported-by: Robert Schwebel <r.schwebel@pengutronix.de> Closes: https://lore.kernel.org/v9fs/ZK25XZ%2BGpR3KHIB%2F@pengutronix.de Reviewed-by: Dominique Martinet <asmadeus@codewreck.org> Reviewed-by: Christian Schoenebeck <linux_oss@crudebyte.com> Signed-off-by: Eric Van Hensbergen <ericvh@kernel.org> --- fs/9p/vfs_file.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-)