1 files changed, 45 insertions, 6 deletions

diff --git a/fs/ioctl.c b/fs/ioctl.c
index 82d9c42b8bac..5612880fcbe7 100644
--- a/fs/ioctl.c
+++ b/fs/ioctl.c
@@ -15,6 +15,7 @@
 #include <linux/uaccess.h>
 #include <linux/writeback.h>
 #include <linux/buffer_head.h>
+#include <linux/falloc.h>
 
 #include <asm/ioctls.h>
 
@@ -70,9 +71,7 @@ static int ioctl_fibmap(struct file *filp, int __user *p)
         res = get_user(block, p);
         if (res)
                 return res;
-        lock_kernel();
         res = mapping->a_ops->bmap(mapping, block);
-        unlock_kernel();
         return put_user(res, p);
 }
 
@@ -405,6 +404,37 @@ EXPORT_SYMBOL(generic_block_fiemap);
 
 #endif  /*  CONFIG_BLOCK  */
 
+/*
+ * This provides compatibility with legacy XFS pre-allocation ioctls
+ * which predate the fallocate syscall.
+ *
+ * Only the l_start, l_len and l_whence fields of the 'struct space_resv'
+ * are used here, rest are ignored.
+ */
+int ioctl_preallocate(struct file *filp, void __user *argp)
+{
+        struct inode *inode = filp->f_path.dentry->d_inode;
+        struct space_resv sr;
+
+        if (copy_from_user(&sr, argp, sizeof(sr)))
+                return -EFAULT;
+
+        switch (sr.l_whence) {
+        case SEEK_SET:
+                break;
+        case SEEK_CUR:
+                sr.l_start += filp->f_pos;
+                break;
+        case SEEK_END:
+                sr.l_start += i_size_read(inode);
+                break;
+        default:
+                return -EINVAL;
+        }
+
+        return do_fallocate(filp, FALLOC_FL_KEEP_SIZE, sr.l_start, sr.l_len);
+}
+
 static int file_ioctl(struct file *filp, unsigned int cmd,
                 unsigned long arg)
 {
@@ -414,12 +444,11 @@ static int file_ioctl(struct file *filp, unsigned int cmd,
         switch (cmd) {
         case FIBMAP:
                 return ioctl_fibmap(filp, p);
-        case FS_IOC_FIEMAP:
-                return ioctl_fiemap(filp, arg);
-        case FIGETBSZ:
-                return put_user(inode->i_sb->s_blocksize, p);
         case FIONREAD:
                 return put_user(i_size_read(inode) - filp->f_pos, p);
+        case FS_IOC_RESVSP:
+        case FS_IOC_RESVSP64:
+                return ioctl_preallocate(filp, p);
         }
 
         return vfs_ioctl(filp, cmd, arg);
@@ -557,6 +586,16 @@ int do_vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd,
                 error = ioctl_fsthaw(filp);
                 break;
 
+        case FS_IOC_FIEMAP:
+                return ioctl_fiemap(filp, arg);
+
+        case FIGETBSZ:
+        {
+                struct inode *inode = filp->f_path.dentry->d_inode;
+                int __user *p = (int __user *)arg;
+                return put_user(inode->i_sb->s_blocksize, p);
+        }
+
         default:
                 if (S_ISREG(filp->f_path.dentry->d_inode->i_mode))
                         error = file_ioctl(filp, cmd, arg);