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authorDave Hansen <haveblue@us.ibm.com>2008-02-16 01:37:49 +0300
committerAl Viro <viro@zeniv.linux.org.uk>2008-04-19 08:25:34 +0400
commit9079b1eb1753f217c3de9f1b7dd7fd549cc3f0cf (patch)
tree8e522ad0b16829849e4b1602270eb10997fba41d /fs
parent75c3f29de7451677c59580b0a959f694f36aac28 (diff)
downloadlinux-9079b1eb1753f217c3de9f1b7dd7fd549cc3f0cf.tar.xz
[PATCH] r/o bind mounts: get write access for vfs_rename() callers
This also uses the little helper in the NFS code to make an if() a little bit less ugly. We introduced the helper at the beginning of the series. 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')
-rw-r--r--fs/namei.c4
-rw-r--r--fs/nfsd/vfs.c17
2 files changed, 17 insertions, 4 deletions
diff --git a/fs/namei.c b/fs/namei.c
index 00df735fb509..83c843b3fea3 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -2718,8 +2718,12 @@ static int do_rename(int olddfd, const char *oldname,
if (new_dentry == trap)
goto exit5;
+ error = mnt_want_write(oldnd.path.mnt);
+ if (error)
+ goto exit5;
error = vfs_rename(old_dir->d_inode, old_dentry,
new_dir->d_inode, new_dentry);
+ mnt_drop_write(oldnd.path.mnt);
exit5:
dput(new_dentry);
exit4:
diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index 71f899482306..18a4cc9feeb3 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -1710,13 +1710,20 @@ nfsd_rename(struct svc_rqst *rqstp, struct svc_fh *ffhp, char *fname, int flen,
if (ndentry == trap)
goto out_dput_new;
-#ifdef MSNFS
- if ((ffhp->fh_export->ex_flags & NFSEXP_MSNFS) &&
+ if (svc_msnfs(ffhp) &&
((atomic_read(&odentry->d_count) > 1)
|| (atomic_read(&ndentry->d_count) > 1))) {
host_err = -EPERM;
- } else
-#endif
+ goto out_dput_new;
+ }
+
+ host_err = -EXDEV;
+ if (ffhp->fh_export->ex_path.mnt != tfhp->fh_export->ex_path.mnt)
+ goto out_dput_new;
+ host_err = mnt_want_write(ffhp->fh_export->ex_path.mnt);
+ if (host_err)
+ goto out_dput_new;
+
host_err = vfs_rename(fdir, odentry, tdir, ndentry);
if (!host_err && EX_ISSYNC(tfhp->fh_export)) {
host_err = nfsd_sync_dir(tdentry);
@@ -1724,6 +1731,8 @@ nfsd_rename(struct svc_rqst *rqstp, struct svc_fh *ffhp, char *fname, int flen,
host_err = nfsd_sync_dir(fdentry);
}
+ mnt_drop_write(ffhp->fh_export->ex_path.mnt);
+
out_dput_new:
dput(ndentry);
out_dput_old: