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authorJosef Bacik <josef@redhat.com>2011-07-18 13:21:37 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2011-07-20 20:47:57 -0400
commitc334b1138bd44bea578eab7971c59bd9212a1093 (patch)
treea91a04ce72a4f12bdb6c8ca26400a466dcce5120 /fs
parentb26751575a9aa55fd6dbf3febde3ff06dfadc44f (diff)
Ext4: handle SEEK_HOLE/SEEK_DATA generically
Since Ext4 has its own lseek we need to make sure it handles SEEK_HOLE/SEEK_DATA. For now just do the same thing that is done in the generic case, somebody else can come along and make it do fancy things later. Thanks, Signed-off-by: Josef Bacik <josef@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs')
-rw-r--r--fs/ext4/file.c21
1 files changed, 21 insertions, 0 deletions
diff --git a/fs/ext4/file.c b/fs/ext4/file.c
index 2c0972322009..ce766f974b1d 100644
--- a/fs/ext4/file.c
+++ b/fs/ext4/file.c
@@ -236,6 +236,27 @@ loff_t ext4_llseek(struct file *file, loff_t offset, int origin)
}
offset += file->f_pos;
break;
+ case SEEK_DATA:
+ /*
+ * In the generic case the entire file is data, so as long as
+ * offset isn't at the end of the file then the offset is data.
+ */
+ if (offset >= inode->i_size) {
+ mutex_unlock(&inode->i_mutex);
+ return -ENXIO;
+ }
+ break;
+ case SEEK_HOLE:
+ /*
+ * There is a virtual hole at the end of the file, so as long as
+ * offset isn't i_size or larger, return i_size.
+ */
+ if (offset >= inode->i_size) {
+ mutex_unlock(&inode->i_mutex);
+ return -ENXIO;
+ }
+ offset = inode->i_size;
+ break;
}
if (offset < 0 || offset > maxbytes) {