1 files changed, 59 insertions, 18 deletions

diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c
index 004c2abbc732..5727cd18302a 100644
--- a/fs/ocfs2/file.c
+++ b/fs/ocfs2/file.c
@@ -34,6 +34,7 @@
 #include <linux/splice.h>
 #include <linux/mount.h>
 #include <linux/writeback.h>
+#include <linux/falloc.h>
 
 #define MLOG_MASK_PREFIX ML_INODE
 #include <cluster/masklog.h>
@@ -1504,30 +1505,19 @@ out:
 /*
  * Parts of this function taken from xfs_change_file_space()
  */
-int ocfs2_change_file_space(struct file *file, unsigned int cmd,
-                            struct ocfs2_space_resv *sr)
+static int __ocfs2_change_file_space(struct file *file, struct inode *inode,
+                                     loff_t f_pos, unsigned int cmd,
+                                     struct ocfs2_space_resv *sr,
+                                     int change_size)
 {
         int ret;
         s64 llen;
-        struct inode *inode = file->f_path.dentry->d_inode;
+        loff_t size;
         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
         struct buffer_head *di_bh = NULL;
         handle_t *handle;
         unsigned long long max_off = ocfs2_max_file_offset(inode->i_sb->s_blocksize_bits);
 
-        if ((cmd == OCFS2_IOC_RESVSP || cmd == OCFS2_IOC_RESVSP64) &&
-            !ocfs2_writes_unwritten_extents(osb))
-                return -ENOTTY;
-        else if ((cmd == OCFS2_IOC_UNRESVSP || cmd == OCFS2_IOC_UNRESVSP64) &&
-                 !ocfs2_sparse_alloc(osb))
-                return -ENOTTY;
-
-        if (!S_ISREG(inode->i_mode))
-                return -EINVAL;
-
-        if (!(file->f_mode & FMODE_WRITE))
-                return -EBADF;
-
         if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
                 return -EROFS;
 
@@ -1557,7 +1547,7 @@ int ocfs2_change_file_space(struct file *file, unsigned int cmd,
         case 0: /*SEEK_SET*/
                 break;
         case 1: /*SEEK_CUR*/
-                sr->l_start += file->f_pos;
+                sr->l_start += f_pos;
                 break;
         case 2: /*SEEK_END*/
                 sr->l_start += i_size_read(inode);
@@ -1577,6 +1567,7 @@ int ocfs2_change_file_space(struct file *file, unsigned int cmd,
                 ret = -EINVAL;
                 goto out_meta_unlock;
         }
+        size = sr->l_start + sr->l_len;
 
         if (cmd == OCFS2_IOC_RESVSP || cmd == OCFS2_IOC_RESVSP64) {
                 if (sr->l_len <= 0) {
@@ -1585,7 +1576,7 @@ int ocfs2_change_file_space(struct file *file, unsigned int cmd,
                 }
         }
 
-        if (should_remove_suid(file->f_path.dentry)) {
+        if (file && should_remove_suid(file->f_path.dentry)) {
                 ret = __ocfs2_write_remove_suid(inode, di_bh);
                 if (ret) {
                         mlog_errno(ret);
@@ -1628,6 +1619,9 @@ int ocfs2_change_file_space(struct file *file, unsigned int cmd,
                 goto out_meta_unlock;
         }
 
+        if (change_size && i_size_read(inode) < size)
+                i_size_write(inode, size);
+
         inode->i_ctime = inode->i_mtime = CURRENT_TIME;
         ret = ocfs2_mark_inode_dirty(handle, inode, di_bh);
         if (ret < 0)
@@ -1646,6 +1640,52 @@ out:
         return ret;
 }
 
+int ocfs2_change_file_space(struct file *file, unsigned int cmd,
+                            struct ocfs2_space_resv *sr)
+{
+        struct inode *inode = file->f_path.dentry->d_inode;
+        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);;
+
+        if ((cmd == OCFS2_IOC_RESVSP || cmd == OCFS2_IOC_RESVSP64) &&
+            !ocfs2_writes_unwritten_extents(osb))
+                return -ENOTTY;
+        else if ((cmd == OCFS2_IOC_UNRESVSP || cmd == OCFS2_IOC_UNRESVSP64) &&
+                 !ocfs2_sparse_alloc(osb))
+                return -ENOTTY;
+
+        if (!S_ISREG(inode->i_mode))
+                return -EINVAL;
+
+        if (!(file->f_mode & FMODE_WRITE))
+                return -EBADF;
+
+        return __ocfs2_change_file_space(file, inode, file->f_pos, cmd, sr, 0);
+}
+
+static long ocfs2_fallocate(struct inode *inode, int mode, loff_t offset,
+                            loff_t len)
+{
+        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+        struct ocfs2_space_resv sr;
+        int change_size = 1;
+
+        if (!ocfs2_writes_unwritten_extents(osb))
+                return -EOPNOTSUPP;
+
+        if (S_ISDIR(inode->i_mode))
+                return -ENODEV;
+
+        if (mode & FALLOC_FL_KEEP_SIZE)
+                change_size = 0;
+
+        sr.l_whence = 0;
+        sr.l_start = (s64)offset;
+        sr.l_len = (s64)len;
+
+        return __ocfs2_change_file_space(NULL, inode, offset,
+                                         OCFS2_IOC_RESVSP64, &sr, change_size);
+}
+
 static int ocfs2_prepare_inode_for_write(struct dentry *dentry,
                                          loff_t *ppos,
                                          size_t count,
@@ -2312,6 +2352,7 @@ const struct inode_operations ocfs2_file_iops = {
         .setattr        = ocfs2_setattr,
         .getattr        = ocfs2_getattr,
         .permission     = ocfs2_permission,
+        .fallocate      = ocfs2_fallocate,
 };
 
 const struct inode_operations ocfs2_special_file_iops = {