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Subject[RFC][PATCH 17/20] elevate mnt writers for vfs_unlink() callers
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Signed-off-by: Dave Hansen <haveblue@us.ibm.com>
---

lxc-dave/fs/namei.c | 4 ++++
lxc-dave/ipc/mqueue.c | 5 ++++-
2 files changed, 8 insertions(+), 1 deletion(-)

diff -puN fs/namei.c~C-elevate-writers-vfs_unlink fs/namei.c
--- lxc/fs/namei.c~C-elevate-writers-vfs_unlink 2006-06-16 15:58:10.000000000 -0700
+++ lxc-dave/fs/namei.c 2006-06-16 15:58:10.000000000 -0700
@@ -2136,7 +2136,11 @@ 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~C-elevate-writers-vfs_unlink ipc/mqueue.c
--- lxc/ipc/mqueue.c~C-elevate-writers-vfs_unlink 2006-06-16 15:58:10.000000000 -0700
+++ lxc-dave/ipc/mqueue.c 2006-06-16 15:58:10.000000000 -0700
@@ -741,8 +741,11 @@ 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);

_
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