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Date: Tue, 13 Nov 2007 05:10:28 -0500
From: Erez Zadok <ezk@...sunysb.edu>
To: akpm@...ux-foundation.org
Cc: linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
viro@....linux.org.uk, hch@...radead.org,
Erez Zadok <ezk@...sunysb.edu>
Subject: [PATCH 9/9] Unionfs: move debugging checks inside locks
This is to ensure that the objects we want to check aren't being destroyed
or changed by another thread.
Signed-off-by: Erez Zadok <ezk@...sunysb.edu>
---
fs/unionfs/commonfops.c | 7 ++++---
fs/unionfs/dentry.c | 2 +-
fs/unionfs/file.c | 10 +++++-----
fs/unionfs/inode.c | 25 +++++++++++++------------
fs/unionfs/mmap.c | 2 +-
fs/unionfs/super.c | 4 ++--
fs/unionfs/xattr.c | 8 ++++----
7 files changed, 30 insertions(+), 28 deletions(-)
diff --git a/fs/unionfs/commonfops.c b/fs/unionfs/commonfops.c
index 624f920..b33917e 100644
--- a/fs/unionfs/commonfops.c
+++ b/fs/unionfs/commonfops.c
@@ -573,6 +573,7 @@ int unionfs_open(struct inode *inode, struct file *file)
}
}
+ /* XXX: should this unlock be moved to the function bottom? */
unionfs_unlock_dentry(dentry);
out:
@@ -582,12 +583,12 @@ out:
kfree(UNIONFS_F(file));
}
out_nofree:
- unionfs_read_unlock(inode->i_sb);
unionfs_check_inode(inode);
if (!err) {
unionfs_check_file(file);
unionfs_check_dentry(file->f_path.dentry->d_parent);
}
+ unionfs_read_unlock(inode->i_sb);
return err;
}
@@ -786,8 +787,8 @@ long unionfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
}
out:
- unionfs_read_unlock(file->f_path.dentry->d_sb);
unionfs_check_file(file);
+ unionfs_read_unlock(file->f_path.dentry->d_sb);
return err;
}
@@ -825,7 +826,7 @@ int unionfs_flush(struct file *file, fl_owner_t id)
unionfs_copy_attr_times(dentry->d_parent->d_inode);
out:
- unionfs_read_unlock(dentry->d_sb);
unionfs_check_file(file);
+ unionfs_read_unlock(dentry->d_sb);
return err;
}
diff --git a/fs/unionfs/dentry.c b/fs/unionfs/dentry.c
index aed4d39..edea1a4 100644
--- a/fs/unionfs/dentry.c
+++ b/fs/unionfs/dentry.c
@@ -433,11 +433,11 @@ static int unionfs_d_revalidate(struct dentry *dentry, struct nameidata *nd)
unionfs_lock_dentry(dentry);
err = __unionfs_d_revalidate_chain(dentry, nd, false);
- unionfs_unlock_dentry(dentry);
if (likely(err > 0)) { /* true==1: dentry is valid */
unionfs_check_dentry(dentry);
unionfs_check_nd(nd);
}
+ unionfs_unlock_dentry(dentry);
unionfs_read_unlock(dentry->d_sb);
diff --git a/fs/unionfs/file.c b/fs/unionfs/file.c
index 809e0f1..cfbfb8e 100644
--- a/fs/unionfs/file.c
+++ b/fs/unionfs/file.c
@@ -32,8 +32,8 @@ static ssize_t unionfs_read(struct file *file, char __user *buf,
err = do_sync_read(file, buf, count, ppos);
out:
- unionfs_read_unlock(file->f_path.dentry->d_sb);
unionfs_check_file(file);
+ unionfs_read_unlock(file->f_path.dentry->d_sb);
return err;
}
@@ -55,8 +55,8 @@ static ssize_t unionfs_aio_read(struct kiocb *iocb, const struct iovec *iov,
err = wait_on_sync_kiocb(iocb);
out:
- unionfs_read_unlock(file->f_path.dentry->d_sb);
unionfs_check_file(file);
+ unionfs_read_unlock(file->f_path.dentry->d_sb);
return err;
}
@@ -127,13 +127,13 @@ static int unionfs_mmap(struct file *file, struct vm_area_struct *vma)
}
out:
- unionfs_read_unlock(file->f_path.dentry->d_sb);
if (!err) {
/* copyup could cause parent dir times to change */
unionfs_copy_attr_times(file->f_path.dentry->d_parent->d_inode);
unionfs_check_file(file);
unionfs_check_dentry(file->f_path.dentry->d_parent);
}
+ unionfs_read_unlock(file->f_path.dentry->d_sb);
return err;
}
@@ -180,8 +180,8 @@ int unionfs_fsync(struct file *file, struct dentry *dentry, int datasync)
unionfs_copy_attr_times(inode);
out:
- unionfs_read_unlock(file->f_path.dentry->d_sb);
unionfs_check_file(file);
+ unionfs_read_unlock(file->f_path.dentry->d_sb);
return err;
}
@@ -226,8 +226,8 @@ int unionfs_fasync(int fd, struct file *file, int flag)
unionfs_copy_attr_times(inode);
out:
- unionfs_read_unlock(file->f_path.dentry->d_sb);
unionfs_check_file(file);
+ unionfs_read_unlock(file->f_path.dentry->d_sb);
return err;
}
diff --git a/fs/unionfs/inode.c b/fs/unionfs/inode.c
index 223a64a..1708f40 100644
--- a/fs/unionfs/inode.c
+++ b/fs/unionfs/inode.c
@@ -158,8 +158,6 @@ out:
if (!err)
unionfs_postcopyup_setmnt(dentry);
- unionfs_unlock_dentry(dentry);
- unionfs_read_unlock(dentry->d_sb);
unionfs_check_inode(parent);
if (!err) {
@@ -167,6 +165,8 @@ out:
unionfs_check_nd(nd);
}
unionfs_check_dentry(dentry);
+ unionfs_unlock_dentry(dentry);
+ unionfs_read_unlock(dentry->d_sb);
return err;
}
@@ -206,13 +206,14 @@ static struct dentry *unionfs_lookup(struct inode *parent,
dentry = ret;
/* parent times may have changed */
unionfs_copy_attr_times(dentry->d_parent->d_inode);
- unionfs_unlock_dentry(dentry);
}
unionfs_check_inode(parent);
unionfs_check_dentry(dentry);
unionfs_check_dentry(dentry->d_parent);
unionfs_check_nd(nd);
+ if (!IS_ERR(ret))
+ unionfs_unlock_dentry(dentry);
unionfs_read_unlock(dentry->d_sb);
return ret;
@@ -356,12 +357,12 @@ out:
if (!err)
unionfs_postcopyup_setmnt(new_dentry);
- unionfs_unlock_dentry(new_dentry);
- unionfs_unlock_dentry(old_dentry);
-
unionfs_check_inode(dir);
unionfs_check_dentry(new_dentry);
unionfs_check_dentry(old_dentry);
+
+ unionfs_unlock_dentry(new_dentry);
+ unionfs_unlock_dentry(old_dentry);
unionfs_read_unlock(old_dentry->d_sb);
return err;
@@ -522,10 +523,10 @@ out:
kfree(name);
if (!err)
unionfs_postcopyup_setmnt(dentry);
- unionfs_unlock_dentry(dentry);
unionfs_check_inode(dir);
unionfs_check_dentry(dentry);
+ unionfs_unlock_dentry(dentry);
unionfs_read_unlock(dentry->d_sb);
return err;
@@ -675,9 +676,9 @@ out:
if (!err)
unionfs_copy_attr_times(dentry->d_inode);
- unionfs_unlock_dentry(dentry);
unionfs_check_inode(parent);
unionfs_check_dentry(dentry);
+ unionfs_unlock_dentry(dentry);
unionfs_read_unlock(dentry->d_sb);
return err;
@@ -805,10 +806,10 @@ out:
if (!err)
unionfs_postcopyup_setmnt(dentry);
- unionfs_unlock_dentry(dentry);
unionfs_check_inode(dir);
unionfs_check_dentry(dentry);
+ unionfs_unlock_dentry(dentry);
unionfs_read_unlock(dentry->d_sb);
return err;
@@ -843,8 +844,8 @@ static int unionfs_readlink(struct dentry *dentry, char __user *buf,
lower_dentry->d_inode);
out:
- unionfs_unlock_dentry(dentry);
unionfs_check_dentry(dentry);
+ unionfs_unlock_dentry(dentry);
unionfs_read_unlock(dentry->d_sb);
return err;
@@ -906,11 +907,11 @@ static void unionfs_put_link(struct dentry *dentry, struct nameidata *nd,
if (unlikely(!__unionfs_d_revalidate_chain(dentry, nd, false)))
printk(KERN_ERR
"unionfs: put_link failed to revalidate dentry\n");
- unionfs_unlock_dentry(dentry);
unionfs_check_dentry(dentry);
unionfs_check_nd(nd);
kfree(nd_get_link(nd));
+ unionfs_unlock_dentry(dentry);
unionfs_read_unlock(dentry->d_sb);
}
@@ -1090,9 +1091,9 @@ static int unionfs_setattr(struct dentry *dentry, struct iattr *ia)
/* if setattr succeeded, then parent dir may have changed */
unionfs_copy_attr_times(dentry->d_parent->d_inode);
out:
- unionfs_unlock_dentry(dentry);
unionfs_check_dentry(dentry);
unionfs_check_dentry(dentry->d_parent);
+ unionfs_unlock_dentry(dentry);
unionfs_read_unlock(dentry->d_sb);
return err;
diff --git a/fs/unionfs/mmap.c b/fs/unionfs/mmap.c
index ef8822f..4918f77 100644
--- a/fs/unionfs/mmap.c
+++ b/fs/unionfs/mmap.c
@@ -296,8 +296,8 @@ out:
if (err < 0)
ClearPageUptodate(page);
- unionfs_read_unlock(file->f_path.dentry->d_sb);
unionfs_check_file(file);
+ unionfs_read_unlock(file->f_path.dentry->d_sb);
return err; /* assume all is ok */
}
diff --git a/fs/unionfs/super.c b/fs/unionfs/super.c
index 70487bf..88f77d7 100644
--- a/fs/unionfs/super.c
+++ b/fs/unionfs/super.c
@@ -153,8 +153,8 @@ static int unionfs_statfs(struct dentry *dentry, struct kstatfs *buf)
memset(&buf->f_spare, 0, sizeof(buf->f_spare));
out:
- unionfs_unlock_dentry(dentry);
unionfs_check_dentry(dentry);
+ unionfs_unlock_dentry(dentry);
unionfs_read_unlock(sb);
return err;
}
@@ -797,8 +797,8 @@ out_free:
kfree(new_data);
kfree(new_lower_inodes);
out_error:
- unionfs_write_unlock(sb);
unionfs_check_dentry(sb->s_root);
+ unionfs_write_unlock(sb);
return err;
}
diff --git a/fs/unionfs/xattr.c b/fs/unionfs/xattr.c
index 602cedf..00c6d0d 100644
--- a/fs/unionfs/xattr.c
+++ b/fs/unionfs/xattr.c
@@ -58,8 +58,8 @@ ssize_t unionfs_getxattr(struct dentry *dentry, const char *name, void *value,
err = vfs_getxattr(lower_dentry, (char *) name, value, size);
out:
- unionfs_unlock_dentry(dentry);
unionfs_check_dentry(dentry);
+ unionfs_unlock_dentry(dentry);
unionfs_read_unlock(dentry->d_sb);
return err;
}
@@ -88,8 +88,8 @@ int unionfs_setxattr(struct dentry *dentry, const char *name,
size, flags);
out:
- unionfs_unlock_dentry(dentry);
unionfs_check_dentry(dentry);
+ unionfs_unlock_dentry(dentry);
unionfs_read_unlock(dentry->d_sb);
return err;
}
@@ -116,8 +116,8 @@ int unionfs_removexattr(struct dentry *dentry, const char *name)
err = vfs_removexattr(lower_dentry, (char *) name);
out:
- unionfs_unlock_dentry(dentry);
unionfs_check_dentry(dentry);
+ unionfs_unlock_dentry(dentry);
unionfs_read_unlock(dentry->d_sb);
return err;
}
@@ -146,8 +146,8 @@ ssize_t unionfs_listxattr(struct dentry *dentry, char *list, size_t size)
err = vfs_listxattr(lower_dentry, encoded_list, size);
out:
- unionfs_unlock_dentry(dentry);
unionfs_check_dentry(dentry);
+ unionfs_unlock_dentry(dentry);
unionfs_read_unlock(dentry->d_sb);
return err;
}
--
1.5.2.2
-
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