Merge branches 'x86-fixes-for-linus', 'perf-fixes-for-linus' and 'sched-fixes-for...

[linux-beck.git] / fs / btrfs / ioctl.c

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 463d91b4dd3a720ece2afb592b2edefca855aaba..f1c9bb4079ed8b3aaf2a01bb5211923f8e231986 100644 (file)
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -233,7 +233,8 @@ static noinline int create_subvol(struct btrfs_root *root,
        struct btrfs_inode_item *inode_item;
        struct extent_buffer *leaf;
        struct btrfs_root *new_root;
-       struct inode *dir = dentry->d_parent->d_inode;
+       struct dentry *parent = dget_parent(dentry);
+       struct inode *dir;
        int ret;
        int err;
        u64 objectid;
@@ -242,8 +243,13 @@ static noinline int create_subvol(struct btrfs_root *root,
 
        ret = btrfs_find_free_objectid(NULL, root->fs_info->tree_root,
                                       0, &objectid);
-       if (ret)
+       if (ret) {
+               dput(parent);
                return ret;
+       }
+
+       dir = parent->d_inode;
+
        /*
         * 1 - inode item
         * 2 - refs
@@ -251,8 +257,10 @@ static noinline int create_subvol(struct btrfs_root *root,
         * 2 - dir items
         */
        trans = btrfs_start_transaction(root, 6);
-       if (IS_ERR(trans))
+       if (IS_ERR(trans)) {
+               dput(parent);
                return PTR_ERR(trans);
+       }
 
        leaf = btrfs_alloc_free_block(trans, root, root->leafsize,
                                      0, objectid, NULL, 0, 0, 0);
@@ -339,6 +347,7 @@ static noinline int create_subvol(struct btrfs_root *root,
 
        d_instantiate(dentry, btrfs_lookup_dentry(dir, dentry));
 fail:
+       dput(parent);
        if (async_transid) {
                *async_transid = trans->transid;
                err = btrfs_commit_transaction_async(trans, root, 1);
@@ -354,6 +363,7 @@ static int create_snapshot(struct btrfs_root *root, struct dentry *dentry,
                           char *name, int namelen, u64 *async_transid)
 {
        struct inode *inode;
+       struct dentry *parent;
        struct btrfs_pending_snapshot *pending_snapshot;
        struct btrfs_trans_handle *trans;
        int ret;
@@ -396,7 +406,9 @@ static int create_snapshot(struct btrfs_root *root, struct dentry *dentry,
 
        btrfs_orphan_cleanup(pending_snapshot->snap);
 
-       inode = btrfs_lookup_dentry(dentry->d_parent->d_inode, dentry);
+       parent = dget_parent(dentry);
+       inode = btrfs_lookup_dentry(parent->d_inode, dentry);
+       dput(parent);
        if (IS_ERR(inode)) {
                ret = PTR_ERR(inode);
                goto fail;
@@ -1669,12 +1681,11 @@ static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd,
                olen = len = src->i_size - off;
        /* if we extend to eof, continue to block boundary */
        if (off + len == src->i_size)
-               len = ((src->i_size + bs-1) & ~(bs-1))
-                       - off;
+               len = ALIGN(src->i_size, bs) - off;
 
        /* verify the end result is block aligned */
-       if ((off & (bs-1)) ||
-           ((off + len) & (bs-1)))
+       if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs) ||
+           !IS_ALIGNED(destoff, bs))
                goto out_unlock;
 
        /* do any pending delalloc/csum calc on src, one way or
@@ -1874,8 +1885,8 @@ static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd,
                         * but shouldn't round up the file size
                         */
                        endoff = new_key.offset + datal;
-                       if (endoff > off+olen)
-                               endoff = off+olen;
+                       if (endoff > destoff+olen)
+                               endoff = destoff+olen;
                        if (endoff > inode->i_size)
                                btrfs_i_size_write(inode, endoff);