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authorJohn Crispin <john@openwrt.org>2015-05-30 13:16:23 +0000
committerJohn Crispin <john@openwrt.org>2015-05-30 13:16:23 +0000
commit50da78705a4f5364fce802ed4d3f70d72f7f5138 (patch)
treeea11bbd319b4fbd5a7facbc46de4a8d005896777 /target/linux/ar71xx/patches-3.18
parente56b6f6e66625bf82bc1456dbf38d054a6c6c1d9 (diff)
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kernel: upstream fix: mount overlayfs r/o if workdir cannot be created
move the patch to the proper folder Signed-off-by: John Crispin <blogic@openwrt.org> SVN-Revision: 45848
Diffstat (limited to 'target/linux/ar71xx/patches-3.18')
-rw-r--r--target/linux/ar71xx/patches-3.18/910-overlayfs-fallback-to-readonly-when-full.patch109
1 files changed, 0 insertions, 109 deletions
diff --git a/target/linux/ar71xx/patches-3.18/910-overlayfs-fallback-to-readonly-when-full.patch b/target/linux/ar71xx/patches-3.18/910-overlayfs-fallback-to-readonly-when-full.patch
deleted file mode 100644
index 53d9e516fc..0000000000
--- a/target/linux/ar71xx/patches-3.18/910-overlayfs-fallback-to-readonly-when-full.patch
+++ /dev/null
@@ -1,109 +0,0 @@
-[linux-unionfs added to Cc]
-
-On Tue, May 19, 2015 at 09:51:20AM +0200, Bastian Bittorf wrote:
-> Hi Miklos,
->
-> sorry for writing directly to you, feel free to forward
-> this to the appropriate mailinglist.
->
-> we have a problem with mainline overlay filesystem on kernel 3.18:
-> https://dev.openwrt.org/ticket/19564
->
-> 2 things are odd:
-> when the working filesystem is full, overlays fails with:
->
-> overlayfs: failed to create directory /overlay/work/work
->
-> what is strange, that we call it with:
->
-> mount(overlay, "/mnt", "overlay", MS_NOATIME, lowerdir)
->
-> see here:
-> http://nbd.name/gitweb.cgi?p=fstools.git;a=blob;f=libfstools/mount.c;h=81176ce399b4cd8e2d347c0008c13dec92407f55;hb=e6004000ff15d7bd32cf5663e8690fc94d7ec747#l125
->
-> do you have an idea whats wrong?
-> 1) is it really needed, that we need space for creating dir "/overlay/work"?
-> 2) why does overlay need "/overlay/work/work"?
-
-The work directory is needed for atomic copy-up and similar. It is not actually
-necessary to mount a read-only overlay. Post 4.0 it is possible to mount the
-overlay without workdir (but even then it won't happen automatically in case the
-upper fs is full, so this should be fixed in the latest kernel too).
-
-Could you please try the following patch? If the workdir can't be created it
-will fall back to mounting the overlay read-only.
-
-Thanks,
-Miklos
-
----
- fs/overlayfs/copy_up.c | 3 +++
- fs/overlayfs/dir.c | 9 +++++++++
- fs/overlayfs/super.c | 12 +++++++++---
- 3 files changed, 21 insertions(+), 3 deletions(-)
-
---- a/fs/overlayfs/copy_up.c
-+++ b/fs/overlayfs/copy_up.c
-@@ -300,6 +300,9 @@ int ovl_copy_up_one(struct dentry *paren
- struct cred *override_cred;
- char *link = NULL;
-
-+ if (WARN_ON(!workdir))
-+ return -EROFS;
-+
- ovl_path_upper(parent, &parentpath);
- upperdir = parentpath.dentry;
-
---- a/fs/overlayfs/dir.c
-+++ b/fs/overlayfs/dir.c
-@@ -222,6 +222,9 @@ static struct dentry *ovl_clear_empty(st
- struct kstat stat;
- int err;
-
-+ if (WARN_ON(!workdir))
-+ return ERR_PTR(-EROFS);
-+
- err = ovl_lock_rename_workdir(workdir, upperdir);
- if (err)
- goto out;
-@@ -322,6 +325,9 @@ static int ovl_create_over_whiteout(stru
- struct dentry *newdentry;
- int err;
-
-+ if (WARN_ON(!workdir))
-+ return -EROFS;
-+
- err = ovl_lock_rename_workdir(workdir, upperdir);
- if (err)
- goto out;
-@@ -506,6 +512,9 @@ static int ovl_remove_and_whiteout(struc
- struct dentry *opaquedir = NULL;
- int err;
-
-+ if (WARN_ON(!workdir))
-+ return -EROFS;
-+
- if (is_dir) {
- opaquedir = ovl_check_empty_and_clear(dentry);
- err = PTR_ERR(opaquedir);
---- a/fs/overlayfs/super.c
-+++ b/fs/overlayfs/super.c
-@@ -740,9 +740,15 @@ static int ovl_fill_super(struct super_b
- ufs->workdir = ovl_workdir_create(ufs->upper_mnt, workpath.dentry);
- err = PTR_ERR(ufs->workdir);
- if (IS_ERR(ufs->workdir)) {
-- pr_err("overlayfs: failed to create directory %s/%s\n",
-- ufs->config.workdir, OVL_WORKDIR_NAME);
-- goto out_put_lower_mnt;
-+ if (err == -ENOSPC || err == -EROFS) {
-+ pr_warning("overlayfs: failed to create work directory (%s), mounting read-only\n", err == ENOSPC ? "ENOSPC" : "EROFS");
-+ sb->s_flags |= MS_RDONLY;
-+ ufs->workdir = NULL;
-+ } else {
-+ pr_err("overlayfs: failed to create directory %s/%s\n",
-+ ufs->config.workdir, OVL_WORKDIR_NAME);
-+ goto out_put_lower_mnt;
-+ }
- }
-
- /*