[PATCH] r/o bind mounts: elevate write count for chmod/chown callers

chown/chmod,etc...  don't call permission in the same way that the normal
"open for write" calls do.  They still write to the filesystem, so bump the
write count during these operations.

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>

1 files changed, 30 insertions, 9 deletions

diff --git a/fs/open.c b/fs/open.c
index e12f17010324..e2df8fd1eb0b 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -567,12 +567,12 @@ asmlinkage long sys_fchmod(unsigned int fd, mode_t mode)
 
         audit_inode(NULL, dentry);
 
-        err = -EROFS;
-        if (IS_RDONLY(inode))
+        err = mnt_want_write(file->f_path.mnt);
+        if (err)
                 goto out_putf;
         err = -EPERM;
         if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
-                goto out_putf;
+                goto out_drop_write;
         mutex_lock(&inode->i_mutex);
         if (mode == (mode_t) -1)
                 mode = inode->i_mode;
@@ -581,6 +581,8 @@ asmlinkage long sys_fchmod(unsigned int fd, mode_t mode)
         err = notify_change(dentry, &newattrs);
         mutex_unlock(&inode->i_mutex);
 
+out_drop_write:
+        mnt_drop_write(file->f_path.mnt);
 out_putf:
         fput(file);
 out:
@@ -600,13 +602,13 @@ asmlinkage long sys_fchmodat(int dfd, const char __user *filename,
                 goto out;
         inode = nd.path.dentry->d_inode;
 
-        error = -EROFS;
-        if (IS_RDONLY(inode))
+        error = mnt_want_write(nd.path.mnt);
+        if (error)
                 goto dput_and_out;
 
         error = -EPERM;
         if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
-                goto dput_and_out;
+                goto out_drop_write;
 
         mutex_lock(&inode->i_mutex);
         if (mode == (mode_t) -1)
@@ -616,6 +618,8 @@ asmlinkage long sys_fchmodat(int dfd, const char __user *filename,
         error = notify_change(nd.path.dentry, &newattrs);
         mutex_unlock(&inode->i_mutex);
 
+out_drop_write:
+        mnt_drop_write(nd.path.mnt);
 dput_and_out:
         path_put(&nd.path);
 out:
@@ -638,9 +642,6 @@ static int chown_common(struct dentry * dentry, uid_t user, gid_t group)
                 printk(KERN_ERR "chown_common: NULL inode\n");
                 goto out;
         }
-        error = -EROFS;
-        if (IS_RDONLY(inode))
-                goto out;
         error = -EPERM;
         if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
                 goto out;
@@ -671,7 +672,12 @@ asmlinkage long sys_chown(const char __user * filename, uid_t user, gid_t group)
         error = user_path_walk(filename, &nd);
         if (error)
                 goto out;
+        error = mnt_want_write(nd.path.mnt);
+        if (error)
+                goto out_release;
         error = chown_common(nd.path.dentry, user, group);
+        mnt_drop_write(nd.path.mnt);
+out_release:
         path_put(&nd.path);
 out:
         return error;
@@ -691,7 +697,12 @@ asmlinkage long sys_fchownat(int dfd, const char __user *filename, uid_t user,
         error = __user_walk_fd(dfd, filename, follow, &nd);
         if (error)
                 goto out;
+        error = mnt_want_write(nd.path.mnt);
+        if (error)
+                goto out_release;
         error = chown_common(nd.path.dentry, user, group);
+        mnt_drop_write(nd.path.mnt);
+out_release:
         path_put(&nd.path);
 out:
         return error;
@@ -705,7 +716,12 @@ asmlinkage long sys_lchown(const char __user * filename, uid_t user, gid_t group
         error = user_path_walk_link(filename, &nd);
         if (error)
                 goto out;
+        error = mnt_want_write(nd.path.mnt);
+        if (error)
+                goto out_release;
         error = chown_common(nd.path.dentry, user, group);
+        mnt_drop_write(nd.path.mnt);
+out_release:
         path_put(&nd.path);
 out:
         return error;
@@ -722,9 +738,14 @@ asmlinkage long sys_fchown(unsigned int fd, uid_t user, gid_t group)
         if (!file)
                 goto out;
 
+        error = mnt_want_write(file->f_path.mnt);
+        if (error)
+                goto out_fput;
         dentry = file->f_path.dentry;
         audit_inode(NULL, dentry);
         error = chown_common(dentry, user, group);
+        mnt_drop_write(file->f_path.mnt);
+out_fput:
         fput(file);
 out:
         return error;