4.9-stable review patch. If anyone has any objections, please let me know.
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From: Bob Peterson rpeterso@redhat.com
[ Upstream commit e79e0e1428188b24c3b57309ffa54a33c4ae40c4 ]
Before this patch, you could get into situations like this:
1. Process 1 searches for X free blocks, finds them, makes a reservation 2. Process 2 searches for free blocks in the same rgrp, but now the bitmap is full because process 1's reservation is skipped over. So it marks the bitmap as GBF_FULL. 3. Process 1 tries to allocate blocks from its own reservation, but since the GBF_FULL bit is set, it skips over the rgrp and searches elsewhere, thus not using its own reservation.
This patch adds an additional check to allow processes to use their own reservations.
Signed-off-by: Bob Peterson rpeterso@redhat.com Signed-off-by: Andreas Gruenbacher agruenba@redhat.com Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- fs/gfs2/rgrp.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
--- a/fs/gfs2/rgrp.c +++ b/fs/gfs2/rgrp.c @@ -1675,7 +1675,8 @@ static int gfs2_rbm_find(struct gfs2_rbm
while(1) { bi = rbm_bi(rbm); - if (test_bit(GBF_FULL, &bi->bi_flags) && + if ((ip == NULL || !gfs2_rs_active(&ip->i_res)) && + test_bit(GBF_FULL, &bi->bi_flags) && (state == GFS2_BLKST_FREE)) goto next_bitmap;