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Subject[PATCH 4/5] EXT4: Replace cut'n'pasted llseek code with generic_file_llseek_size
Date
From: Andi Kleen <ak@linux.intel.com>

This gives ext4 the benefits of unlocked llseek.

Cc: tytso@mit.edu
Signed-off-by: Andi Kleen <ak@linux.intel.com>
---
fs/ext4/file.c | 26 +-------------------------
1 files changed, 1 insertions(+), 25 deletions(-)
diff --git a/fs/ext4/file.c b/fs/ext4/file.c
index 2c09723..ce40447 100644
--- a/fs/ext4/file.c
+++ b/fs/ext4/file.c
@@ -224,32 +224,8 @@ loff_t ext4_llseek(struct file *file, loff_t offset, int origin)
maxbytes = EXT4_SB(inode->i_sb)->s_bitmap_maxbytes;
else
maxbytes = inode->i_sb->s_maxbytes;
- mutex_lock(&inode->i_mutex);
- switch (origin) {
- case SEEK_END:
- offset += inode->i_size;
- break;
- case SEEK_CUR:
- if (offset == 0) {
- mutex_unlock(&inode->i_mutex);
- return file->f_pos;
- }
- offset += file->f_pos;
- break;
- }
-
- if (offset < 0 || offset > maxbytes) {
- mutex_unlock(&inode->i_mutex);
- return -EINVAL;
- }
-
- if (offset != file->f_pos) {
- file->f_pos = offset;
- file->f_version = 0;
- }
- mutex_unlock(&inode->i_mutex);

- return offset;
+ return generic_file_llseek_size(file, offset, origin, maxbytes);
}

const struct file_operations ext4_file_operations = {
--
1.7.4.4


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