The patch titled
r/o bind mounts: elevate mnt writers for vfs_unlink() callers
has been removed from the -mm tree. Its filename is
ro-bind-mounts-elevate-mnt-writers-for-vfs_unlink-callers.patch
This patch was dropped because Viro's comments sounded rather serious
------------------------------------------------------
Subject: r/o bind mounts: elevate mnt writers for vfs_unlink() callers
From: Dave Hansen <haveblue@xxxxxxxxxx>
Signed-off-by: Dave Hansen <haveblue@xxxxxxxxxx>
Cc: Serge Hallyn <serue@xxxxxxxxxx>
Cc: Herbert Poetzl <herbert@xxxxxxxxxxxx>
Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
fs/namei.c | 4 ++++
ipc/mqueue.c | 5 ++++-
2 files changed, 8 insertions(+), 1 deletion(-)
diff -puN fs/namei.c~ro-bind-mounts-elevate-mnt-writers-for-vfs_unlink-callers fs/namei.c
--- a/fs/namei.c~ro-bind-mounts-elevate-mnt-writers-for-vfs_unlink-callers
+++ a/fs/namei.c
@@ -2158,7 +2158,11 @@ static long do_unlinkat(int dfd, const c
inode = dentry->d_inode;
if (inode)
atomic_inc(&inode->i_count);
+ error = mnt_want_write(nd.mnt);
+ if (error)
+ goto exit2;
error = vfs_unlink(nd.dentry->d_inode, dentry);
+ mnt_drop_write(nd.mnt);
exit2:
dput(dentry);
}
diff -puN ipc/mqueue.c~ro-bind-mounts-elevate-mnt-writers-for-vfs_unlink-callers ipc/mqueue.c
--- a/ipc/mqueue.c~ro-bind-mounts-elevate-mnt-writers-for-vfs_unlink-callers
+++ a/ipc/mqueue.c
@@ -748,8 +748,11 @@ asmlinkage long sys_mq_unlink(const char
inode = dentry->d_inode;
if (inode)
atomic_inc(&inode->i_count);
-
+ err = mnt_want_write(mqueue_mnt);
+ if (err)
+ goto out_err;
err = vfs_unlink(dentry->d_parent->d_inode, dentry);
+ mnt_drop_write(mqueue_mnt);
out_err:
dput(dentry);
_
Patches currently in -mm which might be from haveblue@xxxxxxxxxx are
origin.patch
git-acpi.patch
ro-bind-mounts-elevate-mnt-writers-for-vfs_unlink-callers.patch
ro-bind-mounts-do_rmdir-elevate-write-count.patch
ro-bind-mounts-elevate-writer-count-for-custom-struct-file.patch
ro-bind-mounts-honor-r-w-changes-at-do_remount-time.patch
page-owner-tracking-leak-detector.patch
x86-e820-debugging.patch
-
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