[XFS] remove dependency of the dmapi module on behaviors

Mount options are now parsed by the main XFS module and rejected if dmapi
support is not available, and there is a new dm operation to send the
mount event.

SGI-PV: 969608
SGI-Modid: xfs-linux-melb:xfs-kern:29502a

Signed-off-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: David Chinner <dgc@sgi.com>
Signed-off-by: Tim Shimmin <tes@sgi.com>

6 files changed, 82 insertions, 40 deletions

diff --git a/fs/xfs/linux-2.6/xfs_vfs.c b/fs/xfs/linux-2.6/xfs_vfs.c
index 6ed7f137a031..1ce15706458a 100644
--- a/fs/xfs/linux-2.6/xfs_vfs.c
+++ b/fs/xfs/linux-2.6/xfs_vfs.c
@@ -156,19 +156,6 @@ vfs_vget(
 }
 
 int
-vfs_dmapiops(
-        struct bhv_desc         *bdp,
-        caddr_t                 addr)
-{
-        struct bhv_desc         *next = bdp;
-
-        ASSERT(next);
-        while (! (bhvtovfsops(next))->vfs_dmapiops)
-                next = BHV_NEXT(next);
-        return ((*bhvtovfsops(next)->vfs_dmapiops)(next, addr));
-}
-
-int
 vfs_quotactl(
         struct bhv_desc         *bdp,
         int                     cmd,
@@ -306,7 +293,6 @@ bhv_remove_all_vfsops(
         struct xfs_mount        *mp;
 
         bhv_remove_vfsops(vfsp, VFS_POSITION_QM);
-        bhv_remove_vfsops(vfsp, VFS_POSITION_DM);
         if (!freebase)
                 return;
         mp = XFS_VFSTOM(vfsp);
diff --git a/fs/xfs/linux-2.6/xfs_vfs.h b/fs/xfs/linux-2.6/xfs_vfs.h
index 768ffa96e62b..e63dbdbfd8a0 100644
--- a/fs/xfs/linux-2.6/xfs_vfs.h
+++ b/fs/xfs/linux-2.6/xfs_vfs.h
@@ -66,14 +66,12 @@ typedef struct bhv_vfs {
 typedef enum {
         VFS_BHV_UNKNOWN,        /* not specified */
         VFS_BHV_XFS,            /* xfs */
-        VFS_BHV_DM,             /* data migration */
         VFS_BHV_QM,             /* quota manager */
         VFS_BHV_IO,             /* IO path */
         VFS_BHV_END             /* housekeeping end-of-range */
 } bhv_vfs_type_t;
 
 #define VFS_POSITION_XFS        (BHV_POSITION_BASE)
-#define VFS_POSITION_DM         (VFS_POSITION_BASE+10)
 #define VFS_POSITION_QM         (VFS_POSITION_BASE+20)
 #define VFS_POSITION_IO         (VFS_POSITION_BASE+30)
 
@@ -129,7 +127,6 @@ typedef int	(*vfs_statvfs_t)(bhv_desc_t *, bhv_statvfs_t *,
                                 struct inode *);
 typedef int     (*vfs_sync_t)(bhv_desc_t *, int, struct cred *);
 typedef int     (*vfs_vget_t)(bhv_desc_t *, struct inode **, struct fid *);
-typedef int     (*vfs_dmapiops_t)(bhv_desc_t *, caddr_t);
 typedef int     (*vfs_quotactl_t)(bhv_desc_t *, int, int, caddr_t);
 typedef void    (*vfs_init_vnode_t)(bhv_desc_t *,
                                 struct inode *, struct xfs_inode *, int);
@@ -147,7 +144,6 @@ typedef struct bhv_vfsops {
         vfs_statvfs_t           vfs_statvfs;    /* file system statistics */
         vfs_sync_t              vfs_sync;       /* flush files */
         vfs_vget_t              vfs_vget;       /* get vnode from fid */
-        vfs_dmapiops_t          vfs_dmapiops;   /* data migration */
         vfs_quotactl_t          vfs_quotactl;   /* disk quota */
         vfs_init_vnode_t        vfs_init_vnode; /* initialize a new vnode */
         vfs_force_shutdown_t    vfs_force_shutdown;     /* crash and burn */
@@ -167,7 +163,6 @@ typedef struct bhv_vfsops {
 #define bhv_vfs_statvfs(v, sp,vp)       vfs_statvfs(VFSHEAD(v), sp,vp)
 #define bhv_vfs_sync(v, flag,cr)        vfs_sync(VFSHEAD(v), flag,cr)
 #define bhv_vfs_vget(v, vpp,fidp)       vfs_vget(VFSHEAD(v), vpp,fidp)
-#define bhv_vfs_dmapiops(v, p)          vfs_dmapiops(VFSHEAD(v), p)
 #define bhv_vfs_quotactl(v, c,id,p)     vfs_quotactl(VFSHEAD(v), c,id,p)
 #define bhv_vfs_init_vnode(v, vp,b,ul)  vfs_init_vnode(VFSHEAD(v), vp,b,ul)
 #define bhv_vfs_force_shutdown(v,u,f,l) vfs_force_shutdown(VFSHEAD(v), u,f,l)
@@ -185,7 +180,6 @@ typedef struct bhv_vfsops {
 #define bhv_next_vfs_statvfs(b, sp,vp)          vfs_statvfs(b, sp,vp)
 #define bhv_next_vfs_sync(b, flag,cr)           vfs_sync(b, flag,cr)
 #define bhv_next_vfs_vget(b, vpp,fidp)          vfs_vget(b, vpp,fidp)
-#define bhv_next_vfs_dmapiops(b, p)             vfs_dmapiops(b, p)
 #define bhv_next_vfs_quotactl(b, c,id,p)        vfs_quotactl(b, c,id,p)
 #define bhv_next_vfs_init_vnode(b, vp,b2,ul)    vfs_init_vnode(b, vp,b2,ul)
 #define bhv_next_force_shutdown(b, fl,f,l)      vfs_force_shutdown(b, fl,f,l)
@@ -200,7 +194,6 @@ extern int vfs_root(bhv_desc_t *, struct inode **);
 extern int vfs_statvfs(bhv_desc_t *, bhv_statvfs_t *, struct inode *);
 extern int vfs_sync(bhv_desc_t *, int, struct cred *);
 extern int vfs_vget(bhv_desc_t *, struct inode **, struct fid *);
-extern int vfs_dmapiops(bhv_desc_t *, caddr_t);
 extern int vfs_quotactl(bhv_desc_t *, int, int, caddr_t);
 extern void vfs_init_vnode(bhv_desc_t *, struct inode *, struct xfs_inode *, int);
 extern void vfs_force_shutdown(bhv_desc_t *, int, char *, int);
diff --git a/fs/xfs/xfs_dmapi.h b/fs/xfs/xfs_dmapi.h
index 98b4d6325a20..029f96d7d3a0 100644
--- a/fs/xfs/xfs_dmapi.h
+++ b/fs/xfs/xfs_dmapi.h
@@ -168,7 +168,4 @@ typedef enum {
                         DM_FLAGS_NDELAY : 0)
 #define AT_DELAY_FLAG(f) ((f&ATTR_NONBLOCK) ? DM_FLAGS_NDELAY : 0)
 
-
-extern struct bhv_module_vfsops xfs_dmops;
-
 #endif  /* __XFS_DMAPI_H__ */
diff --git a/fs/xfs/xfs_dmops.c b/fs/xfs/xfs_dmops.c
index 1e4a35ddf7f9..6cd5704258a2 100644
--- a/fs/xfs/xfs_dmops.c
+++ b/fs/xfs/xfs_dmops.c
@@ -19,18 +19,51 @@
 #include "xfs_fs.h"
 #include "xfs_types.h"
 #include "xfs_log.h"
-#include "xfs_inum.h"
 #include "xfs_trans.h"
 #include "xfs_sb.h"
-#include "xfs_ag.h"
-#include "xfs_dir2.h"
 #include "xfs_dmapi.h"
+#include "xfs_inum.h"
+#include "xfs_ag.h"
 #include "xfs_mount.h"
+#include "xfs_clnt.h"
+
 
-xfs_dmops_t     xfs_dmcore_stub = {
+static struct xfs_dmops xfs_dmcore_stub = {
         .xfs_send_data          = (xfs_send_data_t)fs_nosys,
         .xfs_send_mmap          = (xfs_send_mmap_t)fs_noerr,
         .xfs_send_destroy       = (xfs_send_destroy_t)fs_nosys,
         .xfs_send_namesp        = (xfs_send_namesp_t)fs_nosys,
-        .xfs_send_unmount       = (xfs_send_unmount_t)fs_noval,
+        .xfs_send_mount         = (xfs_send_mount_t)fs_nosys,
+        .xfs_send_unmount       = (xfs_send_unmount_t)fs_noerr,
 };
+
+int
+xfs_dmops_get(struct xfs_mount *mp, struct xfs_mount_args *args)
+{
+        if (args->flags & XFSMNT_DMAPI) {
+                struct xfs_dmops *ops;
+
+                ops = symbol_get(xfs_dmcore_xfs);
+                if (!ops) {
+                        request_module("xfs_dmapi");
+                        ops = symbol_get(xfs_dmcore_xfs);
+                }
+
+                if (!ops) {
+                        cmn_err(CE_WARN, "XFS: no dmapi support available.");
+                        return EINVAL;
+                }
+                mp->m_dm_ops = ops;
+        } else {
+                mp->m_dm_ops = &xfs_dmcore_stub;
+        }
+
+        return 0;
+}
+
+void
+xfs_dmops_put(struct xfs_mount *mp)
+{
+        if (mp->m_dm_ops != &xfs_dmcore_stub)
+                symbol_put(xfs_dmcore_xfs);
+}
diff --git a/fs/xfs/xfs_mount.h b/fs/xfs/xfs_mount.h
index 02b9a6ee9403..a7cd596ec6d2 100644
--- a/fs/xfs/xfs_mount.h
+++ b/fs/xfs/xfs_mount.h
@@ -85,6 +85,8 @@ typedef int	(*xfs_send_namesp_t)(dm_eventtype_t, struct bhv_vfs *,
                         bhv_vnode_t *,
                         dm_right_t, bhv_vnode_t *, dm_right_t,
                         char *, char *, mode_t, int, int);
+typedef int     (*xfs_send_mount_t)(struct xfs_mount *, dm_right_t,
+                        char *, char *);
 typedef void    (*xfs_send_unmount_t)(struct bhv_vfs *, bhv_vnode_t *,
                         dm_right_t, mode_t, int, int);
 
@@ -93,21 +95,24 @@ typedef struct xfs_dmops {
         xfs_send_mmap_t         xfs_send_mmap;
         xfs_send_destroy_t      xfs_send_destroy;
         xfs_send_namesp_t       xfs_send_namesp;
+        xfs_send_mount_t        xfs_send_mount;
         xfs_send_unmount_t      xfs_send_unmount;
 } xfs_dmops_t;
 
 #define XFS_SEND_DATA(mp, ev,vp,off,len,fl,lock) \
-        (*(mp)->m_dm_ops.xfs_send_data)(ev,vp,off,len,fl,lock)
+        (*(mp)->m_dm_ops->xfs_send_data)(ev,vp,off,len,fl,lock)
 #define XFS_SEND_MMAP(mp, vma,fl) \
-        (*(mp)->m_dm_ops.xfs_send_mmap)(vma,fl)
+        (*(mp)->m_dm_ops->xfs_send_mmap)(vma,fl)
 #define XFS_SEND_DESTROY(mp, vp,right) \
-        (*(mp)->m_dm_ops.xfs_send_destroy)(vp,right)
+        (*(mp)->m_dm_ops->xfs_send_destroy)(vp,right)
 #define XFS_SEND_NAMESP(mp, ev,b1,r1,b2,r2,n1,n2,mode,rval,fl) \
-        (*(mp)->m_dm_ops.xfs_send_namesp)(ev,NULL,b1,r1,b2,r2,n1,n2,mode,rval,fl)
+        (*(mp)->m_dm_ops->xfs_send_namesp)(ev,NULL,b1,r1,b2,r2,n1,n2,mode,rval,fl)
 #define XFS_SEND_PREUNMOUNT(mp, vfs,b1,r1,b2,r2,n1,n2,mode,rval,fl) \
-        (*(mp)->m_dm_ops.xfs_send_namesp)(DM_EVENT_PREUNMOUNT,vfs,b1,r1,b2,r2,n1,n2,mode,rval,fl)
+        (*(mp)->m_dm_ops->xfs_send_namesp)(DM_EVENT_PREUNMOUNT,vfs,b1,r1,b2,r2,n1,n2,mode,rval,fl)
+#define XFS_SEND_MOUNT(mp,right,path,name) \
+        (*(mp)->m_dm_ops->xfs_send_mount)(mp,right,path,name)
 #define XFS_SEND_UNMOUNT(mp, vfsp,vp,right,mode,rval,fl) \
-        (*(mp)->m_dm_ops.xfs_send_unmount)(vfsp,vp,right,mode,rval,fl)
+        (*(mp)->m_dm_ops->xfs_send_unmount)(vfsp,vp,right,mode,rval,fl)
 
 
 /*
@@ -407,7 +412,7 @@ typedef struct xfs_mount {
         uint                    m_chsize;       /* size of next field */
         struct xfs_chash        *m_chash;       /* fs private inode per-cluster
                                                  * hash table */
-        struct xfs_dmops        m_dm_ops;       /* vector of DMI ops */
+        struct xfs_dmops        *m_dm_ops;      /* vector of DMI ops */
         struct xfs_qmops        m_qm_ops;       /* vector of XQM ops */
         struct xfs_ioops        m_io_ops;       /* vector of I/O ops */
         atomic_t                m_active_trans; /* number trans frozen */
@@ -642,7 +647,10 @@ extern void	xfs_sb_from_disk(struct xfs_sb *, struct xfs_dsb *);
 extern void     xfs_sb_to_disk(struct xfs_dsb *, struct xfs_sb *, __int64_t);
 extern int      xfs_sb_validate_fsb_count(struct xfs_sb *, __uint64_t);
 
-extern struct xfs_dmops xfs_dmcore_stub;
+extern int      xfs_dmops_get(struct xfs_mount *, struct xfs_mount_args *);
+extern void     xfs_dmops_put(struct xfs_mount *);
+
+extern struct xfs_dmops xfs_dmcore_xfs;
 extern struct xfs_qmops xfs_qmcore_stub;
 extern struct xfs_ioops xfs_iocore_xfs;
 
diff --git a/fs/xfs/xfs_vfsops.c b/fs/xfs/xfs_vfsops.c
index 8c0e02279249..1cf8f54d8aa9 100644
--- a/fs/xfs/xfs_vfsops.c
+++ b/fs/xfs/xfs_vfsops.c
@@ -326,6 +326,8 @@ xfs_start_flags(
         if (ap->flags2 & XFSMNT2_FILESTREAMS)
                 mp->m_flags |= XFS_MOUNT_FILESTREAMS;
 
+        if (ap->flags & XFSMNT_DMAPI)
+                vfs->vfs_flag |= VFS_DMI;
         return 0;
 }
 
@@ -430,11 +432,13 @@ xfs_mount(
         ddev = vfsp->vfs_super->s_bdev;
         logdev = rtdev = NULL;
 
+        error = xfs_dmops_get(mp, args);
+        if (error)
+                return error;
+
         /*
          * Setup xfs_mount function vectors from available behaviors
          */
-        p = vfs_bhv_lookup(vfsp, VFS_POSITION_DM);
-        mp->m_dm_ops = p ? *(xfs_dmops_t *) vfs_bhv_custom(p) : xfs_dmcore_stub;
         p = vfs_bhv_lookup(vfsp, VFS_POSITION_QM);
         mp->m_qm_ops = p ? *(xfs_qmops_t *) vfs_bhv_custom(p) : xfs_qmcore_stub;
         p = vfs_bhv_lookup(vfsp, VFS_POSITION_IO);
@@ -537,6 +541,8 @@ xfs_mount(
         if (error)
                 goto error2;
 
+        XFS_SEND_MOUNT(mp, DM_RIGHT_NULL, args->mtpt, args->fsname);
+
         return 0;
 
 error2:
@@ -550,6 +556,7 @@ error1:
                 xfs_binval(mp->m_rtdev_targp);
 error0:
         xfs_unmountfs_close(mp, credp);
+        xfs_dmops_put(mp);
         return error;
 }
 
@@ -640,6 +647,7 @@ out:
                  * and free the super block buffer & mount structures.
                  */
                 xfs_unmountfs(mp, credp);
+                xfs_dmops_put(mp);
                 kmem_free(mp, sizeof(xfs_mount_t));
         }
 
@@ -1688,6 +1696,9 @@ xfs_vget(
 #define MNTOPT_ATTR2    "attr2"         /* do use attr2 attribute format */
 #define MNTOPT_NOATTR2  "noattr2"       /* do not use attr2 attribute format */
 #define MNTOPT_FILESTREAM  "filestreams" /* use filestreams allocator */
+#define MNTOPT_DMAPI    "dmapi"         /* DMI enabled (DMAPI / XDSM) */
+#define MNTOPT_XDSM     "xdsm"          /* DMI enabled (DMAPI / XDSM) */
+#define MNTOPT_DMI      "dmi"           /* DMI enabled (DMAPI / XDSM) */
 
 STATIC unsigned long
 suffix_strtoul(char *s, char **endp, unsigned int base)
@@ -1878,6 +1889,12 @@ xfs_parseargs(
                         args->flags &= ~XFSMNT_ATTR2;
                 } else if (!strcmp(this_char, MNTOPT_FILESTREAM)) {
                         args->flags2 |= XFSMNT2_FILESTREAMS;
+                } else if (!strcmp(this_char, MNTOPT_DMAPI)) {
+                        args->flags |= XFSMNT_DMAPI;
+                } else if (!strcmp(this_char, MNTOPT_XDSM)) {
+                        args->flags |= XFSMNT_DMAPI;
+                } else if (!strcmp(this_char, MNTOPT_DMI)) {
+                        args->flags |= XFSMNT_DMAPI;
                 } else if (!strcmp(this_char, "ihashsize")) {
                         cmn_err(CE_WARN,
         "XFS: ihashsize no longer used, option is deprecated.");
@@ -1909,6 +1926,12 @@ xfs_parseargs(
                 return EINVAL;
         }
 
+        if ((args->flags & XFSMNT_DMAPI) && *args->mtpt == '\0') {
+                printk("XFS: %s option needs the mount point option as well\n",
+                        MNTOPT_DMAPI);
+                return EINVAL;
+        }
+
         if ((dsunit && !dswidth) || (!dsunit && dswidth)) {
                 cmn_err(CE_WARN,
                         "XFS: sunit and swidth must be specified together");
@@ -2002,6 +2025,9 @@ xfs_showargs(
         if (vfsp->vfs_flag & VFS_GRPID)
                 seq_printf(m, "," MNTOPT_GRPID);
 
+        if (vfsp->vfs_flag & VFS_DMI)
+                seq_puts(m, "," MNTOPT_DMAPI);
+
         return 0;
 }
 
@@ -2032,7 +2058,6 @@ bhv_vfsops_t xfs_vfsops = {
         .vfs_statvfs            = xfs_statvfs,
         .vfs_sync               = xfs_sync,
         .vfs_vget               = xfs_vget,
-        .vfs_dmapiops           = (vfs_dmapiops_t)fs_nosys,
         .vfs_quotactl           = (vfs_quotactl_t)fs_nosys,
         .vfs_init_vnode         = xfs_initialize_vnode,
         .vfs_force_shutdown     = xfs_do_force_shutdown,