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    Subject[RFC][PATCH 17/20] elevate mnt writers for vfs_unlink() callers
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    Date


    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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