Merge commit 'tracing/core' into tracing/kprobes

Conflicts:
	kernel/trace/trace_export.c
	kernel/trace/trace_kprobe.c

Merge reason: This topic branch lacks an important
build fix in tracing/core:

	0dd7b74787eaf7858c6c573353a83c3e2766e674:
	tracing: Fix double CPP substitution in TRACE_EVENT_FN

that prevents from multiple tracepoint headers inclusion crashes.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>

14 files changed, 112 insertions, 77 deletions

diff --git a/fs/xfs/linux-2.6/xfs_buf.c b/fs/xfs/linux-2.6/xfs_buf.c
index 0c93c7ef3d18..965df1227d64 100644
--- a/fs/xfs/linux-2.6/xfs_buf.c
+++ b/fs/xfs/linux-2.6/xfs_buf.c
@@ -770,7 +770,7 @@ xfs_buf_associate_memory(
         bp->b_pages = NULL;
         bp->b_addr = mem;
 
-        rval = _xfs_buf_get_pages(bp, page_count, 0);
+        rval = _xfs_buf_get_pages(bp, page_count, XBF_DONT_BLOCK);
         if (rval)
                 return rval;
 
diff --git a/fs/xfs/linux-2.6/xfs_ioctl32.c b/fs/xfs/linux-2.6/xfs_ioctl32.c
index 0882d166239a..eafcc7c18706 100644
--- a/fs/xfs/linux-2.6/xfs_ioctl32.c
+++ b/fs/xfs/linux-2.6/xfs_ioctl32.c
@@ -619,7 +619,7 @@ xfs_file_compat_ioctl(
         case XFS_IOC_GETVERSION_32:
                 cmd = _NATIVE_IOC(cmd, long);
                 return xfs_file_ioctl(filp, cmd, p);
-        case XFS_IOC_SWAPEXT: {
+        case XFS_IOC_SWAPEXT_32: {
                 struct xfs_swapext        sxp;
                 struct compat_xfs_swapext __user *sxu = arg;
 
diff --git a/fs/xfs/linux-2.6/xfs_sync.c b/fs/xfs/linux-2.6/xfs_sync.c
index b619d6b8ca43..98ef624d9baf 100644
--- a/fs/xfs/linux-2.6/xfs_sync.c
+++ b/fs/xfs/linux-2.6/xfs_sync.c
@@ -708,6 +708,16 @@ xfs_reclaim_inode(
         return 0;
 }
 
+void
+__xfs_inode_set_reclaim_tag(
+        struct xfs_perag        *pag,
+        struct xfs_inode        *ip)
+{
+        radix_tree_tag_set(&pag->pag_ici_root,
+                           XFS_INO_TO_AGINO(ip->i_mount, ip->i_ino),
+                           XFS_ICI_RECLAIM_TAG);
+}
+
 /*
  * We set the inode flag atomically with the radix tree tag.
  * Once we get tag lookups on the radix tree, this inode flag
@@ -722,8 +732,7 @@ xfs_inode_set_reclaim_tag(
 
         read_lock(&pag->pag_ici_lock);
         spin_lock(&ip->i_flags_lock);
-        radix_tree_tag_set(&pag->pag_ici_root,
-                        XFS_INO_TO_AGINO(mp, ip->i_ino), XFS_ICI_RECLAIM_TAG);
+        __xfs_inode_set_reclaim_tag(pag, ip);
         __xfs_iflags_set(ip, XFS_IRECLAIMABLE);
         spin_unlock(&ip->i_flags_lock);
         read_unlock(&pag->pag_ici_lock);
diff --git a/fs/xfs/linux-2.6/xfs_sync.h b/fs/xfs/linux-2.6/xfs_sync.h
index 2a10301c99c7..59120602588a 100644
--- a/fs/xfs/linux-2.6/xfs_sync.h
+++ b/fs/xfs/linux-2.6/xfs_sync.h
@@ -48,6 +48,7 @@ int xfs_reclaim_inode(struct xfs_inode *ip, int locked, int sync_mode);
 int xfs_reclaim_inodes(struct xfs_mount *mp, int mode);
 
 void xfs_inode_set_reclaim_tag(struct xfs_inode *ip);
+void __xfs_inode_set_reclaim_tag(struct xfs_perag *pag, struct xfs_inode *ip);
 void xfs_inode_clear_reclaim_tag(struct xfs_inode *ip);
 void __xfs_inode_clear_reclaim_tag(struct xfs_mount *mp, struct xfs_perag *pag,
                                 struct xfs_inode *ip);
diff --git a/fs/xfs/xfs_attr.c b/fs/xfs/xfs_attr.c
index db15feb906ff..4ece1906bd41 100644
--- a/fs/xfs/xfs_attr.c
+++ b/fs/xfs/xfs_attr.c
@@ -2010,7 +2010,9 @@ xfs_attr_rmtval_get(xfs_da_args_t *args)
                         dblkno = XFS_FSB_TO_DADDR(mp, map[i].br_startblock);
                         blkcnt = XFS_FSB_TO_BB(mp, map[i].br_blockcount);
                         error = xfs_read_buf(mp, mp->m_ddev_targp, dblkno,
-                                             blkcnt, XFS_BUF_LOCK, &bp);
+                                             blkcnt,
+                                             XFS_BUF_LOCK | XBF_DONT_BLOCK,
+                                             &bp);
                         if (error)
                                 return(error);
 
@@ -2141,8 +2143,8 @@ xfs_attr_rmtval_set(xfs_da_args_t *args)
                 dblkno = XFS_FSB_TO_DADDR(mp, map.br_startblock),
                 blkcnt = XFS_FSB_TO_BB(mp, map.br_blockcount);
 
-                bp = xfs_buf_get_flags(mp->m_ddev_targp, dblkno,
-                                                        blkcnt, XFS_BUF_LOCK);
+                bp = xfs_buf_get_flags(mp->m_ddev_targp, dblkno, blkcnt,
+                                       XFS_BUF_LOCK | XBF_DONT_BLOCK);
                 ASSERT(bp);
                 ASSERT(!XFS_BUF_GETERROR(bp));
 
diff --git a/fs/xfs/xfs_bmap.c b/fs/xfs/xfs_bmap.c
index 7928b9983c1d..8ee5b5a76a2a 100644
--- a/fs/xfs/xfs_bmap.c
+++ b/fs/xfs/xfs_bmap.c
@@ -6009,7 +6009,7 @@ xfs_getbmap(
          */
         error = ENOMEM;
         subnex = 16;
-        map = kmem_alloc(subnex * sizeof(*map), KM_MAYFAIL);
+        map = kmem_alloc(subnex * sizeof(*map), KM_MAYFAIL | KM_NOFS);
         if (!map)
                 goto out_unlock_ilock;
 
diff --git a/fs/xfs/xfs_btree.c b/fs/xfs/xfs_btree.c
index e9df99574829..26717388acf5 100644
--- a/fs/xfs/xfs_btree.c
+++ b/fs/xfs/xfs_btree.c
@@ -120,8 +120,8 @@ xfs_btree_check_sblock(
                         XFS_RANDOM_BTREE_CHECK_SBLOCK))) {
                 if (bp)
                         xfs_buftrace("SBTREE ERROR", bp);
-                XFS_ERROR_REPORT("xfs_btree_check_sblock", XFS_ERRLEVEL_LOW,
-                                 cur->bc_mp);
+                XFS_CORRUPTION_ERROR("xfs_btree_check_sblock",
+                        XFS_ERRLEVEL_LOW, cur->bc_mp, block);
                 return XFS_ERROR(EFSCORRUPTED);
         }
         return 0;
diff --git a/fs/xfs/xfs_da_btree.c b/fs/xfs/xfs_da_btree.c
index 9ff6e57a5075..2847bbc1c534 100644
--- a/fs/xfs/xfs_da_btree.c
+++ b/fs/xfs/xfs_da_btree.c
@@ -2201,7 +2201,7 @@ kmem_zone_t *xfs_dabuf_zone;		/* dabuf zone */
 xfs_da_state_t *
 xfs_da_state_alloc(void)
 {
-        return kmem_zone_zalloc(xfs_da_state_zone, KM_SLEEP);
+        return kmem_zone_zalloc(xfs_da_state_zone, KM_NOFS);
 }
 
 /*
@@ -2261,9 +2261,9 @@ xfs_da_buf_make(int nbuf, xfs_buf_t **bps, inst_t *ra)
         int             off;
 
         if (nbuf == 1)
-                dabuf = kmem_zone_alloc(xfs_dabuf_zone, KM_SLEEP);
+                dabuf = kmem_zone_alloc(xfs_dabuf_zone, KM_NOFS);
         else
-                dabuf = kmem_alloc(XFS_DA_BUF_SIZE(nbuf), KM_SLEEP);
+                dabuf = kmem_alloc(XFS_DA_BUF_SIZE(nbuf), KM_NOFS);
         dabuf->dirty = 0;
 #ifdef XFS_DABUF_DEBUG
         dabuf->ra = ra;
diff --git a/fs/xfs/xfs_dir2.c b/fs/xfs/xfs_dir2.c
index c657bec6d951..bb1d58eb3982 100644
--- a/fs/xfs/xfs_dir2.c
+++ b/fs/xfs/xfs_dir2.c
@@ -256,7 +256,7 @@ xfs_dir_cilookup_result(
                                         !(args->op_flags & XFS_DA_OP_CILOOKUP))
                 return EEXIST;
 
-        args->value = kmem_alloc(len, KM_MAYFAIL);
+        args->value = kmem_alloc(len, KM_NOFS | KM_MAYFAIL);
         if (!args->value)
                 return ENOMEM;
 
diff --git a/fs/xfs/xfs_fsops.c b/fs/xfs/xfs_fsops.c
index cbd451bb4848..2d0b3e1da9e6 100644
--- a/fs/xfs/xfs_fsops.c
+++ b/fs/xfs/xfs_fsops.c
@@ -167,17 +167,25 @@ xfs_growfs_data_private(
         new = nb - mp->m_sb.sb_dblocks;
         oagcount = mp->m_sb.sb_agcount;
         if (nagcount > oagcount) {
+                void *new_perag, *old_perag;
+
                 xfs_filestream_flush(mp);
+
+                new_perag = kmem_zalloc(sizeof(xfs_perag_t) * nagcount,
+                                        KM_MAYFAIL);
+                if (!new_perag)
+                        return XFS_ERROR(ENOMEM);
+
                 down_write(&mp->m_peraglock);
-                mp->m_perag = kmem_realloc(mp->m_perag,
-                        sizeof(xfs_perag_t) * nagcount,
-                        sizeof(xfs_perag_t) * oagcount,
-                        KM_SLEEP);
-                memset(&mp->m_perag[oagcount], 0,
-                        (nagcount - oagcount) * sizeof(xfs_perag_t));
+                memcpy(new_perag, mp->m_perag, sizeof(xfs_perag_t) * oagcount);
+                old_perag = mp->m_perag;
+                mp->m_perag = new_perag;
+
                 mp->m_flags |= XFS_MOUNT_32BITINODES;
                 nagimax = xfs_initialize_perag(mp, nagcount);
                 up_write(&mp->m_peraglock);
+
+                kmem_free(old_perag);
         }
         tp = xfs_trans_alloc(mp, XFS_TRANS_GROWFS);
         tp->t_flags |= XFS_TRANS_RESERVE;
diff --git a/fs/xfs/xfs_iget.c b/fs/xfs/xfs_iget.c
index 34ec86923f7e..ecbf8b4d2e2e 100644
--- a/fs/xfs/xfs_iget.c
+++ b/fs/xfs/xfs_iget.c
@@ -191,80 +191,82 @@ xfs_iget_cache_hit(
         int                     flags,
         int                     lock_flags) __releases(pag->pag_ici_lock)
 {
+        struct inode            *inode = VFS_I(ip);
         struct xfs_mount        *mp = ip->i_mount;
-        int                     error = EAGAIN;
+        int                     error;
+
+        spin_lock(&ip->i_flags_lock);
 
         /*
-         * If INEW is set this inode is being set up
-         * If IRECLAIM is set this inode is being torn down
-         * Pause and try again.
+         * If we are racing with another cache hit that is currently
+         * instantiating this inode or currently recycling it out of
+         * reclaimabe state, wait for the initialisation to complete
+         * before continuing.
+         *
+         * XXX(hch): eventually we should do something equivalent to
+         *           wait_on_inode to wait for these flags to be cleared
+         *           instead of polling for it.
          */
-        if (xfs_iflags_test(ip, (XFS_INEW|XFS_IRECLAIM))) {
+        if (ip->i_flags & (XFS_INEW|XFS_IRECLAIM)) {
                 XFS_STATS_INC(xs_ig_frecycle);
+                error = EAGAIN;
                 goto out_error;
         }
 
-        /* If IRECLAIMABLE is set, we've torn down the vfs inode part */
-        if (xfs_iflags_test(ip, XFS_IRECLAIMABLE)) {
-
-                /*
-                 * If lookup is racing with unlink, then we should return an
-                 * error immediately so we don't remove it from the reclaim
-                 * list and potentially leak the inode.
-                 */
-                if ((ip->i_d.di_mode == 0) && !(flags & XFS_IGET_CREATE)) {
-                        error = ENOENT;
-                        goto out_error;
-                }
+        /*
+         * If lookup is racing with unlink return an error immediately.
+         */
+        if (ip->i_d.di_mode == 0 && !(flags & XFS_IGET_CREATE)) {
+                error = ENOENT;
+                goto out_error;
+        }
 
+        /*
+         * If IRECLAIMABLE is set, we've torn down the VFS inode already.
+         * Need to carefully get it back into useable state.
+         */
+        if (ip->i_flags & XFS_IRECLAIMABLE) {
                 xfs_itrace_exit_tag(ip, "xfs_iget.alloc");
 
                 /*
-                 * We need to re-initialise the VFS inode as it has been
-                 * 'freed' by the VFS. Do this here so we can deal with
-                 * errors cleanly, then tag it so it can be set up correctly
-                 * later.
+                 * We need to set XFS_INEW atomically with clearing the
+                 * reclaimable tag so that we do have an indicator of the
+                 * inode still being initialized.
                  */
-                if (inode_init_always(mp->m_super, VFS_I(ip))) {
-                        error = ENOMEM;
-                        goto out_error;
-                }
+                ip->i_flags |= XFS_INEW;
+                ip->i_flags &= ~XFS_IRECLAIMABLE;
+                __xfs_inode_clear_reclaim_tag(mp, pag, ip);
 
-                /*
-                 * We must set the XFS_INEW flag before clearing the
-                 * XFS_IRECLAIMABLE flag so that if a racing lookup does
-                 * not find the XFS_IRECLAIMABLE above but has the igrab()
-                 * below succeed we can safely check XFS_INEW to detect
-                 * that this inode is still being initialised.
-                 */
-                xfs_iflags_set(ip, XFS_INEW);
-                xfs_iflags_clear(ip, XFS_IRECLAIMABLE);
+                spin_unlock(&ip->i_flags_lock);
+                read_unlock(&pag->pag_ici_lock);
 
-                /* clear the radix tree reclaim flag as well. */
-                __xfs_inode_clear_reclaim_tag(mp, pag, ip);
-        } else if (!igrab(VFS_I(ip))) {
+                error = -inode_init_always(mp->m_super, inode);
+                if (error) {
+                        /*
+                         * Re-initializing the inode failed, and we are in deep
+                         * trouble.  Try to re-add it to the reclaim list.
+                         */
+                        read_lock(&pag->pag_ici_lock);
+                        spin_lock(&ip->i_flags_lock);
+
+                        ip->i_flags &= ~XFS_INEW;
+                        ip->i_flags |= XFS_IRECLAIMABLE;
+                        __xfs_inode_set_reclaim_tag(pag, ip);
+                        goto out_error;
+                }
+                inode->i_state = I_LOCK|I_NEW;
+        } else {
                 /* If the VFS inode is being torn down, pause and try again. */
-                XFS_STATS_INC(xs_ig_frecycle);
-                goto out_error;
-        } else if (xfs_iflags_test(ip, XFS_INEW)) {
-                /*
-                 * We are racing with another cache hit that is
-                 * currently recycling this inode out of the XFS_IRECLAIMABLE
-                 * state. Wait for the initialisation to complete before
-                 * continuing.
-                 */
-                wait_on_inode(VFS_I(ip));
-        }
+                if (!igrab(inode)) {
+                        error = EAGAIN;
+                        goto out_error;
+                }
 
-        if (ip->i_d.di_mode == 0 && !(flags & XFS_IGET_CREATE)) {
-                error = ENOENT;
-                iput(VFS_I(ip));
-                goto out_error;
+                /* We've got a live one. */
+                spin_unlock(&ip->i_flags_lock);
+                read_unlock(&pag->pag_ici_lock);
         }
 
-        /* We've got a live one. */
-        read_unlock(&pag->pag_ici_lock);
-
         if (lock_flags != 0)
                 xfs_ilock(ip, lock_flags);
 
@@ -274,6 +276,7 @@ xfs_iget_cache_hit(
         return 0;
 
 out_error:
+        spin_unlock(&ip->i_flags_lock);
         read_unlock(&pag->pag_ici_lock);
         return error;
 }
diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
index 1f22d65fed0a..da428b3fe0f5 100644
--- a/fs/xfs/xfs_inode.c
+++ b/fs/xfs/xfs_inode.c
@@ -343,6 +343,16 @@ xfs_iformat(
                 return XFS_ERROR(EFSCORRUPTED);
         }
 
+        if (unlikely((ip->i_d.di_flags & XFS_DIFLAG_REALTIME) &&
+                     !ip->i_mount->m_rtdev_targp)) {
+                xfs_fs_repair_cmn_err(CE_WARN, ip->i_mount,
+                        "corrupt dinode %Lu, has realtime flag set.",
+                        ip->i_ino);
+                XFS_CORRUPTION_ERROR("xfs_iformat(realtime)",
+                                     XFS_ERRLEVEL_LOW, ip->i_mount, dip);
+                return XFS_ERROR(EFSCORRUPTED);
+        }
+
         switch (ip->i_d.di_mode & S_IFMT) {
         case S_IFIFO:
         case S_IFCHR:
diff --git a/fs/xfs/xfs_log.c b/fs/xfs/xfs_log.c
index 3750f04ede0b..9dbdff3ea484 100644
--- a/fs/xfs/xfs_log.c
+++ b/fs/xfs/xfs_log.c
@@ -3180,7 +3180,7 @@ try_again:
 STATIC void
 xlog_state_want_sync(xlog_t *log, xlog_in_core_t *iclog)
 {
-        ASSERT(spin_is_locked(&log->l_icloglock));
+        assert_spin_locked(&log->l_icloglock);
 
         if (iclog->ic_state == XLOG_STATE_ACTIVE) {
                 xlog_state_switch_iclogs(log, iclog, 0);
diff --git a/fs/xfs/xfs_vnodeops.c b/fs/xfs/xfs_vnodeops.c
index c4eca5ed5dab..492d75bae2bf 100644
--- a/fs/xfs/xfs_vnodeops.c
+++ b/fs/xfs/xfs_vnodeops.c
@@ -538,7 +538,9 @@ xfs_readlink_bmap(
                 d = XFS_FSB_TO_DADDR(mp, mval[n].br_startblock);
                 byte_cnt = XFS_FSB_TO_B(mp, mval[n].br_blockcount);
 
-                bp = xfs_buf_read(mp->m_ddev_targp, d, BTOBB(byte_cnt), 0);
+                bp = xfs_buf_read_flags(mp->m_ddev_targp, d, BTOBB(byte_cnt),
+                                        XBF_LOCK | XBF_MAPPED |
+                                        XBF_DONT_BLOCK);
                 error = XFS_BUF_GETERROR(bp);
                 if (error) {
                         xfs_ioerror_alert("xfs_readlink",