Merge tag 'xfs-for-linus-3.15-rc1' of git://oss.sgi.com/xfs/xfs

[firefly-linux-kernel-4.4.55.git] / fs / xfs / xfs_file.c

diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
index 64b48eade91d14c79408b6863f199e9181350f81..f7abff8c16ca7361d3e32f1842ae1daed15e651e 100644 (file)
--- a/fs/xfs/xfs_file.c
+++ b/fs/xfs/xfs_file.c
@@ -823,7 +823,8 @@ xfs_file_fallocate(
 
        if (!S_ISREG(inode->i_mode))
                return -EINVAL;
-       if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
+       if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE |
+                    FALLOC_FL_COLLAPSE_RANGE | FALLOC_FL_ZERO_RANGE))
                return -EOPNOTSUPP;
 
        xfs_ilock(ip, XFS_IOLOCK_EXCL);
@@ -831,6 +832,20 @@ xfs_file_fallocate(
                error = xfs_free_file_space(ip, offset, len);
                if (error)
                        goto out_unlock;
+       } else if (mode & FALLOC_FL_COLLAPSE_RANGE) {
+               unsigned blksize_mask = (1 << inode->i_blkbits) - 1;
+
+               if (offset & blksize_mask || len & blksize_mask) {
+                       error = -EINVAL;
+                       goto out_unlock;
+               }
+
+               ASSERT(offset + len < i_size_read(inode));
+               new_size = i_size_read(inode) - len;
+
+               error = xfs_collapse_file_space(ip, offset, len);
+               if (error)
+                       goto out_unlock;
        } else {
                if (!(mode & FALLOC_FL_KEEP_SIZE) &&
                    offset + len > i_size_read(inode)) {
@@ -840,8 +855,11 @@ xfs_file_fallocate(
                                goto out_unlock;
                }
 
-               error = xfs_alloc_file_space(ip, offset, len,
-                                            XFS_BMAPI_PREALLOC);
+               if (mode & FALLOC_FL_ZERO_RANGE)
+                       error = xfs_zero_file_space(ip, offset, len);
+               else
+                       error = xfs_alloc_file_space(ip, offset, len,
+                                                    XFS_BMAPI_PREALLOC);
                if (error)
                        goto out_unlock;
        }
@@ -859,7 +877,7 @@ xfs_file_fallocate(
        if (ip->i_d.di_mode & S_IXGRP)
                ip->i_d.di_mode &= ~S_ISGID;
 
-       if (!(mode & FALLOC_FL_PUNCH_HOLE))
+       if (!(mode & (FALLOC_FL_PUNCH_HOLE | FALLOC_FL_COLLAPSE_RANGE)))
                ip->i_d.di_flags |= XFS_DIFLAG_PREALLOC;
 
        xfs_trans_ichgtime(tp, ip, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);