Adds an filesystem independent ioctl to allow implementation of file
system batched discard support.
Signed-off-by: Lukas Czerner <lczerner@xxxxxxxxxx>
---
fs/ioctl.c | 31 +++++++++++++++++++++++++++++++
include/linux/fs.h | 2 ++
2 files changed, 33 insertions(+), 0 deletions(-)
diff --git a/fs/ioctl.c b/fs/ioctl.c
index 7faefb4..09b33ae 100644
--- a/fs/ioctl.c
+++ b/fs/ioctl.c
@@ -551,6 +551,33 @@ static int ioctl_fsthaw(struct file *filp)
return thaw_bdev(sb->s_bdev, sb);
}
+static int ioctl_fstrim(struct file *filp, unsigned long arg)
+{
+ struct super_block *sb = filp->f_path.dentry->d_inode->i_sb;
+ unsigned int minlen;
+ int err;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ /* If filesystem doesn't support trim feature, return. */
+ if (sb->s_op->trim_fs == NULL)
+ return -EOPNOTSUPP;
+
+ /* If a blockdevice-backed filesystem isn't specified, return EINVAL. */
+ if (sb->s_bdev == NULL)
+ return -EINVAL;
+
+ err = get_user(minlen, (unsigned int __user *) arg);
+ if (err)
+ return err;
+
+ err = sb->s_op->trim_fs(minlen, sb);
+ if (err)
+ return err;
+ return 0;
+}
+
/*
* When you add any new common ioctls to the switches above and below
* please update compat_sys_ioctl() too.
@@ -601,6 +628,10 @@ int do_vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd,
error = ioctl_fsthaw(filp);
break;
+ case FITRIM:
+ error = ioctl_fstrim(filp, arg);
+ break;
+
case FS_IOC_FIEMAP:
return ioctl_fiemap(filp, arg);
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 44f35ae..7a27fa4 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -315,6 +315,7 @@ struct inodes_stat_t {
#define FIGETBSZ _IO(0x00,2) /* get the block size used for bmap */
#define FIFREEZE _IOWR('X', 119, int) /* Freeze */
#define FITHAW _IOWR('X', 120, int) /* Thaw */
+#define FITRIM _IOWR('X', 121, int) /* Trim */
#define FS_IOC_GETFLAGS _IOR('f', 1, long)
#define FS_IOC_SETFLAGS _IOW('f', 2, long)
@@ -1580,6 +1581,7 @@ struct super_operations {
ssize_t (*quota_write)(struct super_block *, int, const char *, size_t, loff_t);
#endif
int (*bdev_try_to_free_page)(struct super_block*, struct page*, gfp_t);
+ int (*trim_fs) (unsigned int, struct super_block *);
};
/*
--
1.6.6.1
--
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