Merge branch 'for-linus' of git://git.open-osd.org/linux-open-osd

* 'for-linus' of git://git.open-osd.org/linux-open-osd:
  exofs: Fix groups code when num_devices is not divisible by group_width
  exofs: Remove useless optimization
  exofs: exofs_file_fsync and exofs_file_flush correctness
  exofs: Remove superfluous dependency on buffer_head and writeback

1 files changed, 12 insertions, 32 deletions

diff --git a/fs/exofs/ios.c b/fs/exofs/ios.c
index e2732203fa93..6550bf70e41d 100644
--- a/fs/exofs/ios.c
+++ b/fs/exofs/ios.c
@@ -305,8 +305,6 @@ int exofs_check_io(struct exofs_io_state *ios, u64 *resid)
 struct _striping_info {
         u64 obj_offset;
         u64 group_length;
-        u64 total_group_length;
-        u64 Major;
         unsigned dev;
         unsigned unit_off;
 };
@@ -343,8 +341,6 @@ static void _calc_stripe_info(struct exofs_io_state *ios, u64 file_offset,
                                   (M * group_depth * stripe_unit);
 
         si->group_length = T - H;
-        si->total_group_length = T;
-        si->Major = M;
 }
 
 static int _add_stripe_unit(struct exofs_io_state *ios,  unsigned *cur_pg,
@@ -392,20 +388,19 @@ static int _add_stripe_unit(struct exofs_io_state *ios,  unsigned *cur_pg,
 }
 
 static int _prepare_one_group(struct exofs_io_state *ios, u64 length,
-                              struct _striping_info *si, unsigned first_comp)
+                              struct _striping_info *si)
 {
         unsigned stripe_unit = ios->layout->stripe_unit;
         unsigned mirrors_p1 = ios->layout->mirrors_p1;
         unsigned devs_in_group = ios->layout->group_width * mirrors_p1;
         unsigned dev = si->dev;
         unsigned first_dev = dev - (dev % devs_in_group);
-        unsigned comp = first_comp + (dev - first_dev);
         unsigned max_comp = ios->numdevs ? ios->numdevs - mirrors_p1 : 0;
         unsigned cur_pg = ios->pages_consumed;
         int ret = 0;
 
         while (length) {
-                struct exofs_per_dev_state *per_dev = &ios->per_dev[comp];
+                struct exofs_per_dev_state *per_dev = &ios->per_dev[dev];
                 unsigned cur_len, page_off = 0;
 
                 if (!per_dev->length) {
@@ -424,11 +419,8 @@ static int _prepare_one_group(struct exofs_io_state *ios, u64 length,
                                 cur_len = stripe_unit;
                         }
 
-                        if (max_comp < comp)
-                                max_comp = comp;
-
-                        dev += mirrors_p1;
-                        dev = (dev % devs_in_group) + first_dev;
+                        if (max_comp < dev)
+                                max_comp = dev;
                 } else {
                         cur_len = stripe_unit;
                 }
@@ -440,8 +432,8 @@ static int _prepare_one_group(struct exofs_io_state *ios, u64 length,
                 if (unlikely(ret))
                         goto out;
 
-                comp += mirrors_p1;
-                comp = (comp % devs_in_group) + first_comp;
+                dev += mirrors_p1;
+                dev = (dev % devs_in_group) + first_dev;
 
                 length -= cur_len;
         }
@@ -454,18 +446,15 @@ out:
 static int _prepare_for_striping(struct exofs_io_state *ios)
 {
         u64 length = ios->length;
+        u64 offset = ios->offset;
         struct _striping_info si;
-        unsigned devs_in_group = ios->layout->group_width *
-                                 ios->layout->mirrors_p1;
-        unsigned first_comp = 0;
         int ret = 0;
 
-        _calc_stripe_info(ios, ios->offset, &si);
-
         if (!ios->pages) {
                 if (ios->kern_buff) {
                         struct exofs_per_dev_state *per_dev = &ios->per_dev[0];
 
+                        _calc_stripe_info(ios, ios->offset, &si);
                         per_dev->offset = si.obj_offset;
                         per_dev->dev = si.dev;
 
@@ -479,26 +468,17 @@ static int _prepare_for_striping(struct exofs_io_state *ios)
         }
 
         while (length) {
+                _calc_stripe_info(ios, offset, &si);
+
                 if (length < si.group_length)
                         si.group_length = length;
 
-                ret = _prepare_one_group(ios, si.group_length, &si, first_comp);
+                ret = _prepare_one_group(ios, si.group_length, &si);
                 if (unlikely(ret))
                         goto out;
 
+                offset += si.group_length;
                 length -= si.group_length;
-
-                si.group_length = si.total_group_length;
-                si.unit_off = 0;
-                ++si.Major;
-                si.obj_offset = si.Major * ios->layout->stripe_unit *
-                                                ios->layout->group_depth;
-
-                si.dev = (si.dev - (si.dev % devs_in_group)) + devs_in_group;
-                si.dev %= ios->layout->s_numdevs;
-
-                first_comp += devs_in_group;
-                first_comp %= ios->layout->s_numdevs;
         }
 
 out: