This patch adds support for the FITRIM ioctl, which enables user space
tools to issue TRIM/DISCARD requests to the underlying device. Every
clean segment within the specified range will be discarded.
Signed-off-by: Andreas Rohner <andreas.rohner@xxxxxxx>
---
fs/nilfs2/ioctl.c | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 52 insertions(+)
diff --git a/fs/nilfs2/ioctl.c b/fs/nilfs2/ioctl.c
index 2b34021..cf21dbd 100644
--- a/fs/nilfs2/ioctl.c
+++ b/fs/nilfs2/ioctl.c
@@ -1072,6 +1072,55 @@ out:
}
/**
+ * nilfs_ioctl_trim_fs() - trim ioctl handle function
+ * @inode: inode object
+ * @argp: pointer on argument from userspace
+ *
+ * Decription: nilfs_ioctl_trim_fs is the FITRIM ioctl handle function. It
+ * checks the arguments from userspace and calls nilfs_sufile_trim_fs, which
+ * performs the actual trim operation.
+ *
+ * Return Value: On success, 0 is returned or negative error code, otherwise.
+ */
+static int nilfs_ioctl_trim_fs(struct inode *inode, void __user *argp)
+{
+ struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
+ struct request_queue *q = bdev_get_queue(nilfs->ns_bdev);
+ struct fstrim_range range;
+ int ret;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ if (!blk_queue_discard(q))
+ return -EOPNOTSUPP;
+
+ if (copy_from_user(&range, argp, sizeof(range)))
+ return -EFAULT;
+
+ range.minlen = max_t(unsigned int, (unsigned int)range.minlen,
+ q->limits.discard_granularity);
+
+ if (range.len < nilfs->ns_blocksize ||
+ range.start >= (nilfs->ns_nsegments *
+ nilfs->ns_blocks_per_segment) <<
+ nilfs->ns_blocksize_bits)
+ return -EINVAL;
+
+ down_read(&nilfs->ns_segctor_sem);
+ ret = nilfs_sufile_trim_fs(nilfs->ns_sufile, &range);
+ up_read(&nilfs->ns_segctor_sem);
+
+ if (ret < 0)
+ return ret;
+
+ if (copy_to_user(argp, &range, sizeof(range)))
+ return -EFAULT;
+
+ return 0;
+}
+
+/**
* nilfs_ioctl_set_alloc_range - limit range of segments to be allocated
* @inode: inode object
* @argp: pointer on argument from userspace
@@ -1205,6 +1254,8 @@ long nilfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
return nilfs_ioctl_resize(inode, filp, argp);
case NILFS_IOCTL_SET_ALLOC_RANGE:
return nilfs_ioctl_set_alloc_range(inode, argp);
+ case FITRIM:
+ return nilfs_ioctl_trim_fs(inode, argp);
default:
return -ENOTTY;
}
@@ -1235,6 +1286,7 @@ long nilfs_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
case NILFS_IOCTL_SYNC:
case NILFS_IOCTL_RESIZE:
case NILFS_IOCTL_SET_ALLOC_RANGE:
+ case FITRIM:
break;
default:
return -ENOIOCTLCMD;
--
1.9.0
--
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