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| author | Felix Fietkau <nbd@openwrt.org> | 2015-12-03 13:54:33 +0000 |
|---|---|---|
| committer | Felix Fietkau <nbd@openwrt.org> | 2015-12-03 13:54:33 +0000 |
| commit | b9849f286b81ffb65208dd5f4bf6162efe1eca97 (patch) | |
| tree | 1ac15f0afb693974074a90207ba20d03c8cdfefb /target/linux/generic | |
| parent | 2bcbe28580e50b12dcd39865575e7a8576a89cd1 (diff) | |
| download | mtk-20170518-b9849f286b81ffb65208dd5f4bf6162efe1eca97.zip mtk-20170518-b9849f286b81ffb65208dd5f4bf6162efe1eca97.tar.gz mtk-20170518-b9849f286b81ffb65208dd5f4bf6162efe1eca97.tar.bz2 | |
kernel: add overlayfs stacking fix from upstream
Overlayfs stacking was broken in 4.1.12 but now fixed in upstream branch.
Stacking allows experimenting with configurations without the need to
reset a device to factory config.
Signed-off-by: Roman Yeryomin <roman@advem.lv>
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
SVN-Revision: 47714
Diffstat (limited to 'target/linux/generic')
| -rw-r--r-- | target/linux/generic/patches-4.1/040-fs-overlay-fix-stacking.patch | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/target/linux/generic/patches-4.1/040-fs-overlay-fix-stacking.patch b/target/linux/generic/patches-4.1/040-fs-overlay-fix-stacking.patch new file mode 100644 index 0000000..b3bb5c7 --- /dev/null +++ b/target/linux/generic/patches-4.1/040-fs-overlay-fix-stacking.patch @@ -0,0 +1,33 @@ +From 1c8a47df36d72ace8cf78eb6c228aa0f8027d3c2 Mon Sep 17 00:00:00 2001 +From: Miklos Szeredi <miklos@szeredi.hu> +Date: Mon, 12 Oct 2015 15:56:20 +0200 +Subject: ovl: fix open in stacked overlay + +If two overlayfs filesystems are stacked on top of each other, then we need +recursion in ovl_d_select_inode(). + +I guess d_backing_inode() is supposed to do that. But currently it doesn't +and that functionality is open coded in vfs_open(). This is now copied +into ovl_d_select_inode() to fix this regression. + +Reported-by: Alban Crequy <alban.crequy@gmail.com> +Signed-off-by: Miklos Szeredi <miklos@szeredi.hu> +Fixes: 4bacc9c9234c ("overlayfs: Make f_path always point to the overlay...") +Cc: David Howells <dhowells@redhat.com> +Cc: <stable@vger.kernel.org> # v4.2+ +--- + fs/overlayfs/inode.c | 3 +++ + 1 file changed, 3 insertions(+) + +--- a/fs/overlayfs/inode.c ++++ b/fs/overlayfs/inode.c +@@ -362,6 +362,9 @@ struct inode *ovl_d_select_inode(struct + ovl_path_upper(dentry, &realpath); + } + ++ if (realpath.dentry->d_flags & DCACHE_OP_SELECT_INODE) ++ return realpath.dentry->d_op->d_select_inode(realpath.dentry, file_flags); ++ + return d_backing_inode(realpath.dentry); + } + |