diff options
| -rw-r--r-- | fs/gfs2/rgrp.c | 54 |
1 files changed, 25 insertions, 29 deletions
diff --git a/fs/gfs2/rgrp.c b/fs/gfs2/rgrp.c index 17a8d3b43990..52a4f340a867 100644 --- a/fs/gfs2/rgrp.c +++ b/fs/gfs2/rgrp.c @@ -1729,25 +1729,22 @@ fail: static int gfs2_rbm_find(struct gfs2_rbm *rbm, u8 state, u32 *minext, const struct gfs2_inode *ip, bool nowrap) { + bool scan_from_start = rbm->bii == 0 && rbm->offset == 0; struct buffer_head *bh; - int initial_bii; - u32 initial_offset; - int first_bii = rbm->bii; - u32 first_offset = rbm->offset; + int last_bii; u32 offset; u8 *buffer; - int n = 0; - int iters = rbm->rgd->rd_length; + bool wrapped = false; int ret; struct gfs2_bitmap *bi; struct gfs2_extent maxext = { .rbm.rgd = rbm->rgd, }; - /* If we are not starting at the beginning of a bitmap, then we - * need to add one to the bitmap count to ensure that we search - * the starting bitmap twice. + /* + * Determine the last bitmap to search. If we're not starting at the + * beginning of a bitmap, we need to search that bitmap twice to scan + * the entire resource group. */ - if (rbm->offset != 0) - iters++; + last_bii = rbm->bii - (rbm->offset == 0); while(1) { bi = rbm_bi(rbm); @@ -1761,47 +1758,46 @@ static int gfs2_rbm_find(struct gfs2_rbm *rbm, u8 state, u32 *minext, WARN_ON(!buffer_uptodate(bh)); if (state != GFS2_BLKST_UNLINKED && bi->bi_clone) buffer = bi->bi_clone + bi->bi_offset; - initial_offset = rbm->offset; offset = gfs2_bitfit(buffer, bi->bi_bytes, rbm->offset, state); - if (offset == BFITNOENT) - goto bitmap_full; + if (offset == BFITNOENT) { + if (state == GFS2_BLKST_FREE && rbm->offset == 0) + set_bit(GBF_FULL, &bi->bi_flags); + goto next_bitmap; + } rbm->offset = offset; if (ip == NULL) return 0; - initial_bii = rbm->bii; ret = gfs2_reservation_check_and_update(rbm, ip, minext ? *minext : 0, &maxext); if (ret == 0) return 0; - if (ret > 0) { - n += (rbm->bii - initial_bii); + if (ret > 0) goto next_iter; - } if (ret == -E2BIG) { rbm->bii = 0; rbm->offset = 0; - n += (rbm->bii - initial_bii); goto res_covered_end_of_rgrp; } return ret; -bitmap_full: /* Mark bitmap as full and fall through */ - if ((state == GFS2_BLKST_FREE) && initial_offset == 0) - set_bit(GBF_FULL, &bi->bi_flags); - next_bitmap: /* Find next bitmap in the rgrp */ rbm->offset = 0; rbm->bii++; if (rbm->bii == rbm->rgd->rd_length) rbm->bii = 0; res_covered_end_of_rgrp: - if ((rbm->bii == 0) && nowrap) - break; - n++; + if (rbm->bii == 0) { + if (wrapped) + break; + wrapped = true; + if (nowrap) + break; + } next_iter: - if (n >= iters) + /* Have we scanned the entire resource group? */ + if (wrapped && rbm->bii > last_bii) break; } @@ -1811,8 +1807,8 @@ next_iter: /* If the extent was too small, and it's smaller than the smallest to have failed before, remember for future reference that it's useless to search this rgrp again for this amount or more. */ - if ((first_offset == 0) && (first_bii == 0) && - (*minext < rbm->rgd->rd_extfail_pt)) + if (wrapped && (scan_from_start || rbm->bii > last_bii) && + *minext < rbm->rgd->rd_extfail_pt) rbm->rgd->rd_extfail_pt = *minext; /* If the maximum extent we found is big enough to fulfill the |