Messages in this thread Patch in this message | | | Subject | [RFC][PATCH 12/30] r/o bind mounts: elevate mnt_writers for unlink callers | From | Dave Hansen <> | Date | Fri, 08 Feb 2008 14:27:03 -0800 |
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Signed-off-by: Dave Hansen <haveblue@us.ibm.com> ---
linux-2.6.git-dave/fs/namei.c | 4 ++++ linux-2.6.git-dave/ipc/mqueue.c | 5 ++++- 2 files changed, 8 insertions(+), 1 deletion(-)
diff -puN fs/namei.c~r-o-bind-mounts-elevate-mnt-writers-for-vfs_unlink-callers fs/namei.c --- linux-2.6.git/fs/namei.c~r-o-bind-mounts-elevate-mnt-writers-for-vfs_unlink-callers 2008-02-08 13:04:50.000000000 -0800 +++ linux-2.6.git-dave/fs/namei.c 2008-02-08 13:04:50.000000000 -0800 @@ -2278,7 +2278,11 @@ 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~r-o-bind-mounts-elevate-mnt-writers-for-vfs_unlink-callers ipc/mqueue.c --- linux-2.6.git/ipc/mqueue.c~r-o-bind-mounts-elevate-mnt-writers-for-vfs_unlink-callers 2008-02-08 13:04:50.000000000 -0800 +++ linux-2.6.git-dave/ipc/mqueue.c 2008-02-08 13:04:50.000000000 -0800 @@ -743,8 +743,11 @@ 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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