staging: lustre: fiemap: set FIEMAP_EXTENT_LAST correctly

When we've collected enough extents as user requested, we'd check one
further to decide whether we've reached the last extent of the file.

Signed-off-by: Bobi Jam <bobijam.xu@intel.com>
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-5933
Reviewed-on: http://review.whamcloud.com/12781
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>
Signed-off-by: James Simmons <jsimmons@infradead.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/lustre/lustre/lov/lov_obd.c b/drivers/staging/lustre/lustre/lov/lov_obd.c
index 9b12159..9ab3033 100644 (file)
--- a/drivers/staging/lustre/lustre/lov/lov_obd.c
+++ b/drivers/staging/lustre/lustre/lov/lov_obd.c
@@ -1548,6 +1548,8 @@ static int lov_fiemap(struct lov_obd *lov, __u32 keylen, void *key,
        u64 fm_start, fm_end, fm_length, fm_end_offset;
        u64 curr_loc;
        int current_extent = 0, rc = 0, i;
+       /* Whether have we collected enough extents */
+       bool enough = false;
        int ost_eof = 0; /* EOF for object */
        int ost_done = 0; /* done with required mapping for this OST? */
        int last_stripe;
@@ -1682,7 +1684,7 @@ static int lov_fiemap(struct lov_obd *lov, __u32 keylen, void *key,
                        lun_start += len_mapped_single_call;
                        fm_local->fm_length = req_fm_len - len_mapped_single_call;
                        req_fm_len = fm_local->fm_length;
-                       fm_local->fm_extent_count = count_local;
+                       fm_local->fm_extent_count = enough ? 1 : count_local;
                        fm_local->fm_mapped_extents = 0;
                        fm_local->fm_flags = fiemap->fm_flags;
 
@@ -1730,6 +1732,12 @@ inactive_tgt:
                                        goto finish;
                                }
                                break;
+                       } else if (enough) {
+                               /*
+                                * We've collected enough extents and there are
+                                * more extents after it.
+                                */
+                               goto finish;
                        }
 
                        /* If we just need num of extents then go to next device */
@@ -1769,7 +1777,7 @@ inactive_tgt:
 
                        /* Ran out of available extents? */
                        if (current_extent >= fiemap->fm_extent_count)
-                               goto finish;
+                               enough = true;
                } while (ost_done == 0 && ost_eof == 0);
 
                if (cur_stripe_wrap == last_stripe)