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-rw-r--r--fs/read_write.c44
1 files changed, 41 insertions, 3 deletions
diff --git a/fs/read_write.c b/fs/read_write.c
index 5520f8ad550..5907b49e4d7 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -64,6 +64,23 @@ generic_file_llseek_unlocked(struct file *file, loff_t offset, int origin)
return file->f_pos;
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)
+ 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)
+ return -ENXIO;
+ offset = inode->i_size;
+ break;
}
if (offset < 0 && !unsigned_offsets(file))
@@ -128,12 +145,13 @@ EXPORT_SYMBOL(no_llseek);
loff_t default_llseek(struct file *file, loff_t offset, int origin)
{
+ struct inode *inode = file->f_path.dentry->d_inode;
loff_t retval;
- mutex_lock(&file->f_dentry->d_inode->i_mutex);
+ mutex_lock(&inode->i_mutex);
switch (origin) {
case SEEK_END:
- offset += i_size_read(file->f_path.dentry->d_inode);
+ offset += i_size_read(inode);
break;
case SEEK_CUR:
if (offset == 0) {
@@ -141,6 +159,26 @@ loff_t default_llseek(struct file *file, loff_t offset, int origin)
goto out;
}
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)
+ 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)
+ return -ENXIO;
+ offset = inode->i_size;
+ break;
}
retval = -EINVAL;
if (offset >= 0 || unsigned_offsets(file)) {
@@ -151,7 +189,7 @@ loff_t default_llseek(struct file *file, loff_t offset, int origin)
retval = offset;
}
out:
- mutex_unlock(&file->f_dentry->d_inode->i_mutex);
+ mutex_unlock(&inode->i_mutex);
return retval;
}
EXPORT_SYMBOL(default_llseek);