[PATCH v4 6/8] xfs: add XFS_IOC_FREE_EOFBLOCKS ioctl

Brian Foster
2012-09-27T17:42:54Z

The XFS_IOC_FREE_EOFBLOCKS ioctl allows users to invoke an EOFBLOCKS
scan. The xfs_eofblocks structure is defined to support the command
parameters (scan mode).

Signed-off-by: Brian Foster <bfoster@redhat.com>
---
fs/xfs/xfs_fs.h | 14 ++++++++++++++
fs/xfs/xfs_ioctl.c | 12 ++++++++++++
2 files changed, 26 insertions(+), 0 deletions(-)

diff --git a/fs/xfs/xfs_fs.h b/fs/xfs/xfs_fs.h
index c13fed8..32bb2e8 100644
--- a/fs/xfs/xfs_fs.h
+++ b/fs/xfs/xfs_fs.h
@@ -339,6 +339,19 @@ typedef struct xfs_error_injection {

/*
+ * Speculative preallocation trimming.
+ */
+struct xfs_eofblocks {
+ __u32 eof_flags;
+ __s32 version;
+ unsigned char pad[12];
+};
+
+/* eof_flags values */
+#define XFS_EOF_FLAGS_FORCE 0x01 /* force/wait mode scan */
+
+
+/*
* The user-level Handle Request interface structure.
*/
typedef struct xfs_fsop_handlereq {
@@ -456,6 +469,7 @@ typedef struct xfs_handle {
/* XFS_IOC_GETBIOSIZE ---- deprecated 47 */
#define XFS_IOC_GETBMAPX _IOWR('X', 56, struct getbmap)
#define XFS_IOC_ZERO_RANGE _IOW ('X', 57, struct xfs_flock64)
+#define XFS_IOC_FREE_EOFBLOCKS _IOR ('X', 58, struct xfs_eofblocks)

/*
* ioctl commands that replace IRIX syssgi()'s
diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c
index 0e0232c..216ca7a 100644
--- a/fs/xfs/xfs_ioctl.c
+++ b/fs/xfs/xfs_ioctl.c
@@ -1602,6 +1602,18 @@ xfs_file_ioctl(
error = xfs_errortag_clearall(mp, 1);
return -error;

+ case XFS_IOC_FREE_EOFBLOCKS: {
+ struct xfs_eofblocks eofb;
+ int flags;
+
+ if (copy_from_user(&eofb, arg, sizeof(eofb)))
+ return -XFS_ERROR(EFAULT);
+
+ flags = (eofb.eof_flags & XFS_EOF_FLAGS_FORCE) ? SYNC_WAIT : SYNC_TRYLOCK;
+ error = xfs_inodes_free_eofblocks(mp, flags);
+ return -error;
+ }
+
default:
return -ENOTTY;
}
--
1.7.7.6