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Ext4: handle SEEK_HOLE/SEEK_DATA generically

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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>
This commit is contained in:
Josef Bacik
2011-07-18 13:21:37 -04:00
committed by Al Viro
parent b26751575a
commit c334b1138b
1 changed files with 21 additions and 0 deletions
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21
fs/ext4/file.c
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@@ -236,6 +236,27 @@ loff_t ext4_llseek(struct file *file, loff_t offset, int origin)
} }
offset += file->f_pos; offset += file->f_pos;
break; 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) { if (offset < 0 || offset > maxbytes) {