Messages in this thread Patch in this message | | | Subject | [PATCH 18/30] r/o bind mounts: write counts for link/symlink | From | Dave Hansen <> | Date | Fri, 15 Feb 2008 14:37:45 -0800 |
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Acked-by: Al Viro <viro@ZenIV.linux.org.uk> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Dave Hansen <haveblue@us.ibm.com> ---
linux-2.6.git-dave/fs/namei.c | 10 ++++++++++ 1 file changed, 10 insertions(+)
diff -puN fs/namei.c~r-o-bind-mounts-elevate-write-count-for-link-and-symlink-calls fs/namei.c --- linux-2.6.git/fs/namei.c~r-o-bind-mounts-elevate-write-count-for-link-and-symlink-calls 2008-02-15 13:25:52.000000000 -0800 +++ linux-2.6.git-dave/fs/namei.c 2008-02-15 13:25:52.000000000 -0800 @@ -2365,7 +2365,12 @@ asmlinkage long sys_symlinkat(const char if (IS_ERR(dentry)) goto out_unlock; + error = mnt_want_write(nd.path.mnt); + if (error) + goto out_dput; error = vfs_symlink(nd.path.dentry->d_inode, dentry, from, S_IALLUGO); + mnt_drop_write(nd.path.mnt); +out_dput: dput(dentry); out_unlock: mutex_unlock(&nd.path.dentry->d_inode->i_mutex); @@ -2460,7 +2465,12 @@ asmlinkage long sys_linkat(int olddfd, c error = PTR_ERR(new_dentry); if (IS_ERR(new_dentry)) goto out_unlock; + error = mnt_want_write(nd.path.mnt); + if (error) + goto out_dput; error = vfs_link(old_nd.path.dentry, nd.path.dentry->d_inode, new_dentry); + mnt_drop_write(nd.path.mnt); +out_dput: dput(new_dentry); out_unlock: mutex_unlock(&nd.path.dentry->d_inode->i_mutex); _
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