xfs: introduce XFS_BMAPI_STACK_SWITCH

Certain allocation paths through xfs_bmapi_write() are in situations
where we have limited stack available. These are almost always in
the buffered IO writeback path when convertion delayed allocation
extents to real extents.

The current stack switch occurs for userdata allocations, which
means we also do stack switches for preallocation, direct IO and
unwritten extent conversion, even those these call chains have never
been implicated in a stack overrun.

Hence, let's target just the single stack overun offended for stack
switches. To do that, introduce a XFS_BMAPI_STACK_SWITCH flag that
the caller can pass xfs_bmapi_write() to indicate it should switch
stacks if it needs to do allocation.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Mark Tinguely <tinguely@sgi.com>
Signed-off-by: Ben Myers <bpm@sgi.com>

5 files changed, 13 insertions, 3 deletions

diff --git a/fs/xfs/xfs_alloc.c b/fs/xfs/xfs_alloc.c
index 0287f3b1b503..43f791bcd8b1 100644
--- a/fs/xfs/xfs_alloc.c
+++ b/fs/xfs/xfs_alloc.c
@@ -2447,7 +2447,7 @@ xfs_alloc_vextent(
 {
         DECLARE_COMPLETION_ONSTACK(done);
 
-        if (!args->userdata)
+        if (!args->stack_switch)
                 return __xfs_alloc_vextent(args);
 
 
diff --git a/fs/xfs/xfs_alloc.h b/fs/xfs/xfs_alloc.h
index 93be4a667ca1..ef7d4885dc2d 100644
--- a/fs/xfs/xfs_alloc.h
+++ b/fs/xfs/xfs_alloc.h
@@ -123,6 +123,7 @@ typedef struct xfs_alloc_arg {
         struct completion *done;
         struct work_struct work;
         int             result;
+        char            stack_switch;
 } xfs_alloc_arg_t;
 
 /*
diff --git a/fs/xfs/xfs_bmap.c b/fs/xfs/xfs_bmap.c
index e1545ec2f7d2..91259554df8b 100644
--- a/fs/xfs/xfs_bmap.c
+++ b/fs/xfs/xfs_bmap.c
@@ -2441,6 +2441,7 @@ xfs_bmap_btalloc(
         args.tp = ap->tp;
         args.mp = mp;
         args.fsbno = ap->blkno;
+        args.stack_switch = ap->stack_switch;
 
         /* Trim the allocation back to the maximum an AG can fit. */
         args.maxlen = MIN(ap->length, XFS_ALLOC_AG_MAX_USABLE(mp));
@@ -4675,6 +4676,9 @@ xfs_bmapi_allocate(
                         return error;
         }
 
+        if (flags & XFS_BMAPI_STACK_SWITCH)
+                bma->stack_switch = 1;
+
         error = xfs_bmap_alloc(bma);
         if (error)
                 return error;
diff --git a/fs/xfs/xfs_bmap.h b/fs/xfs/xfs_bmap.h
index 803b56d7ce16..b68c598034c1 100644
--- a/fs/xfs/xfs_bmap.h
+++ b/fs/xfs/xfs_bmap.h
@@ -77,6 +77,7 @@ typedef	struct xfs_bmap_free
  * from written to unwritten, otherwise convert from unwritten to written.
  */
 #define XFS_BMAPI_CONVERT       0x040
+#define XFS_BMAPI_STACK_SWITCH  0x080
 
 #define XFS_BMAPI_FLAGS \
         { XFS_BMAPI_ENTIRE,     "ENTIRE" }, \
@@ -85,7 +86,8 @@ typedef	struct xfs_bmap_free
         { XFS_BMAPI_PREALLOC,   "PREALLOC" }, \
         { XFS_BMAPI_IGSTATE,    "IGSTATE" }, \
         { XFS_BMAPI_CONTIG,     "CONTIG" }, \
-        { XFS_BMAPI_CONVERT,    "CONVERT" }
+        { XFS_BMAPI_CONVERT,    "CONVERT" }, \
+        { XFS_BMAPI_STACK_SWITCH, "STACK_SWITCH" }
 
 
 static inline int xfs_bmapi_aflag(int w)
@@ -133,6 +135,7 @@ typedef struct xfs_bmalloca {
         char                    userdata;/* set if is user data */
         char                    aeof;   /* allocated space at eof */
         char                    conv;   /* overwriting unwritten extents */
+        char                    stack_switch;
 } xfs_bmalloca_t;
 
 /*
diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c
index 973dff6ad935..7f537663365b 100644
--- a/fs/xfs/xfs_iomap.c
+++ b/fs/xfs/xfs_iomap.c
@@ -584,7 +584,9 @@ xfs_iomap_write_allocate(
                          * pointer that the caller gave to us.
                          */
                         error = xfs_bmapi_write(tp, ip, map_start_fsb,
-                                                count_fsb, 0, &first_block, 1,
+                                                count_fsb,
+                                                XFS_BMAPI_STACK_SWITCH,
+                                                &first_block, 1,
                                                 imap, &nimaps, &free_list);
                         if (error)
                                 goto trans_cancel;