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authorAndreas Gruenbacher <agruenba@redhat.com>2018-10-11 18:56:40 +0200
committerAndreas Gruenbacher <agruenba@redhat.com>2021-01-18 16:56:36 +0100
commitc65b76b893032a9fa69056656c771f5e2fc9ef0c (patch)
tree0bfd19a2bd528863574478f366570d1262d0ae67 /fs/gfs2/incore.h
parent0eacdd16adc425e61926876f15b58008aa5c4784 (diff)
downloadlinux-c65b76b893032a9fa69056656c771f5e2fc9ef0c.tar.bz2
gfs2: Only use struct gfs2_rbm for bitmap manipulations
GFS2 uses struct gfs2_rbm to represent a filesystem block number as a bit position within a resource group. This representation is used in the bitmap manipulation code to prevent excessive conversions between block numbers and bit positions, but also in struct gfs2_blkreserv which is part of struct gfs2_inode, to mark the start of a reservation. In the inode, the bit position representation makes less sense: first, the start position is used as a block number about as often as a bit position; second, the bit position representation makes the code unnecessarily complicated and difficult to read. Therefore, change struct gfs2_blkreserv to represent the start of a reservation as a block number instead of a bit position. (This requires keeping track of the resource group in gfs2_blkreserv separately.) With that change, various things can be slightly simplified, and struct gfs2_rbm can be moved to rgrp.c. Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Diffstat (limited to 'fs/gfs2/incore.h')
-rw-r--r--fs/gfs2/incore.h30
1 files changed, 3 insertions, 27 deletions
diff --git a/fs/gfs2/incore.h b/fs/gfs2/incore.h
index 8e1ab8ed4abc..cca806ff611c 100644
--- a/fs/gfs2/incore.h
+++ b/fs/gfs2/incore.h
@@ -125,31 +125,6 @@ struct gfs2_rgrpd {
struct rb_root rd_rstree; /* multi-block reservation tree */
};
-struct gfs2_rbm {
- struct gfs2_rgrpd *rgd;
- u32 offset; /* The offset is bitmap relative */
- int bii; /* Bitmap index */
-};
-
-static inline struct gfs2_bitmap *rbm_bi(const struct gfs2_rbm *rbm)
-{
- return rbm->rgd->rd_bits + rbm->bii;
-}
-
-static inline u64 gfs2_rbm_to_block(const struct gfs2_rbm *rbm)
-{
- BUG_ON(rbm->offset >= rbm->rgd->rd_data);
- return rbm->rgd->rd_data0 + (rbm_bi(rbm)->bi_start * GFS2_NBBY) +
- rbm->offset;
-}
-
-static inline bool gfs2_rbm_eq(const struct gfs2_rbm *rbm1,
- const struct gfs2_rbm *rbm2)
-{
- return (rbm1->rgd == rbm2->rgd) && (rbm1->bii == rbm2->bii) &&
- (rbm1->offset == rbm2->offset);
-}
-
enum gfs2_state_bits {
BH_Pinned = BH_PrivateStart,
BH_Escaped = BH_PrivateStart + 1,
@@ -313,8 +288,9 @@ struct gfs2_qadata { /* quota allocation data */
*/
struct gfs2_blkreserv {
- struct rb_node rs_node; /* link to other block reservations */
- struct gfs2_rbm rs_rbm; /* Start of reservation */
+ struct rb_node rs_node; /* node within rd_rstree */
+ struct gfs2_rgrpd *rs_rgd;
+ u64 rs_start; /* start of reservation */
u32 rs_free; /* how many blocks are still free */
};