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[PATCH v2 6/8] xfs: add XFS_IOC_FREE_EOFBLOCKS ioctl

To: xfs@xxxxxxxxxxx
Subject: [PATCH v2 6/8] xfs: add XFS_IOC_FREE_EOFBLOCKS ioctl
From: Brian Foster <bfoster@xxxxxxxxxx>
Date: Mon, 10 Sep 2012 14:37:24 -0400
In-reply-to: <1347302246-52710-1-git-send-email-bfoster@xxxxxxxxxx>
References: <1347302246-52710-1-git-send-email-bfoster@xxxxxxxxxx>
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@xxxxxxxxxx>
---
 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

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