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authorDave Hansen <haveblue@us.ibm.com>2008-02-15 14:37:34 -0800
committerAl Viro <viro@zeniv.linux.org.uk>2008-04-19 00:25:33 -0400
commit0622753b800e4cc6cb9319b36b27658c72dd7cdc (patch)
tree5a32b65a087ff7fd5effa8d3f6f1f9717d4391aa /fs/namei.c
parent49e0d02cf018d4edf24bfc8531a816a26367e4ce (diff)
downloadop-kernel-dev-0622753b800e4cc6cb9319b36b27658c72dd7cdc.zip
op-kernel-dev-0622753b800e4cc6cb9319b36b27658c72dd7cdc.tar.gz
[PATCH] r/o bind mounts: elevate write count for rmdir and unlink.
Elevate the write count during the vfs_rmdir() and vfs_unlink(). [AV: merged rmdir and unlink parts, added missing pieces in nfsd] Acked-by: Serge Hallyn <serue@us.ibm.com> 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> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/namei.c')
-rw-r--r--fs/namei.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/fs/namei.c b/fs/namei.c
index a1f8bbb..89ef317 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -2190,7 +2190,12 @@ static long do_rmdir(int dfd, const char __user *pathname)
error = PTR_ERR(dentry);
if (IS_ERR(dentry))
goto exit2;
+ error = mnt_want_write(nd.path.mnt);
+ if (error)
+ goto exit3;
error = vfs_rmdir(nd.path.dentry->d_inode, dentry);
+ mnt_drop_write(nd.path.mnt);
+exit3:
dput(dentry);
exit2:
mutex_unlock(&nd.path.dentry->d_inode->i_mutex);
@@ -2271,7 +2276,11 @@ static long do_unlinkat(int dfd, const char __user *pathname)
inode = dentry->d_inode;
if (inode)
atomic_inc(&inode->i_count);
+ error = mnt_want_write(nd.path.mnt);
+ if (error)
+ goto exit2;
error = vfs_unlink(nd.path.dentry->d_inode, dentry);
+ mnt_drop_write(nd.path.mnt);
exit2:
dput(dentry);
}
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