diff options
Diffstat (limited to 'fs/xfs/xfs_mount.c')
| -rw-r--r-- | fs/xfs/xfs_mount.c | 97 |
1 files changed, 39 insertions, 58 deletions
diff --git a/fs/xfs/xfs_mount.c b/fs/xfs/xfs_mount.c index 29276fe60df9..0b690bc119d7 100644 --- a/fs/xfs/xfs_mount.c +++ b/fs/xfs/xfs_mount.c @@ -171,19 +171,16 @@ xfs_readsb( ASSERT(mp->m_ddev_targp != NULL); /* - * For the initial read, we must guess at the sector - * size based on the block device. It's enough to - * get the sb_sectsize out of the superblock and - * then reread with the proper length. - * We don't verify it yet, because it may not be complete. + * In the first pass, use the device sector size to just read enough + * of the superblock to extract the XFS sector size. + * + * The device sector size must be smaller than or equal to the XFS + * sector size and thus we can always read the superblock. Once we know + * the XFS sector size, re-read it and run the buffer verifier. */ - sector_size = xfs_getsize_buftarg(mp->m_ddev_targp); + sector_size = mp->m_ddev_targp->bt_logical_sectorsize; buf_ops = NULL; - /* - * Allocate a (locked) buffer to hold the superblock. This will be kept - * around at all times to optimize access to the superblock. - */ reread: error = xfs_buf_read_uncached(mp->m_ddev_targp, XFS_SB_DADDR, BTOBB(sector_size), &bp, buf_ops); @@ -247,6 +244,10 @@ reread: /* no need to be quiet anymore, so reset the buf ops */ bp->b_ops = &xfs_sb_buf_ops; + /* + * Keep a pointer of the sb buffer around instead of caching it in the + * buffer cache because we access it frequently. + */ mp->m_sb_bp = bp; xfs_buf_unlock(bp); return 0; @@ -678,68 +679,46 @@ static inline unsigned int max_pow_of_two_factor(const unsigned int nr) } /* - * If the data device advertises atomic write support, limit the size of data - * device atomic writes to the greatest power-of-two factor of the AG size so - * that every atomic write unit aligns with the start of every AG. This is - * required so that the per-AG allocations for an atomic write will always be + * If the underlying device advertises atomic write support, limit the size of + * atomic writes to the greatest power-of-two factor of the group size so + * that every atomic write unit aligns with the start of every group. This is + * required so that the allocations for an atomic write will always be * aligned compatibly with the alignment requirements of the storage. * - * If the data device doesn't advertise atomic writes, then there are no - * alignment restrictions and the largest out-of-place write we can do - * ourselves is the number of blocks that user files can allocate from any AG. - */ -static inline xfs_extlen_t xfs_calc_perag_awu_max(struct xfs_mount *mp) -{ - if (mp->m_ddev_targp->bt_bdev_awu_min > 0) - return max_pow_of_two_factor(mp->m_sb.sb_agblocks); - return rounddown_pow_of_two(mp->m_ag_max_usable); -} - -/* - * Reflink on the realtime device requires rtgroups, and atomic writes require - * reflink. - * - * If the realtime device advertises atomic write support, limit the size of - * data device atomic writes to the greatest power-of-two factor of the rtgroup - * size so that every atomic write unit aligns with the start of every rtgroup. - * This is required so that the per-rtgroup allocations for an atomic write - * will always be aligned compatibly with the alignment requirements of the - * storage. - * - * If the rt device doesn't advertise atomic writes, then there are no - * alignment restrictions and the largest out-of-place write we can do - * ourselves is the number of blocks that user files can allocate from any - * rtgroup. + * If the device doesn't advertise atomic writes, then there are no alignment + * restrictions and the largest out-of-place write we can do ourselves is the + * number of blocks that user files can allocate from any group. */ -static inline xfs_extlen_t xfs_calc_rtgroup_awu_max(struct xfs_mount *mp) +static xfs_extlen_t +xfs_calc_group_awu_max( + struct xfs_mount *mp, + enum xfs_group_type type) { - struct xfs_groups *rgs = &mp->m_groups[XG_TYPE_RTG]; + struct xfs_groups *g = &mp->m_groups[type]; + struct xfs_buftarg *btp = xfs_group_type_buftarg(mp, type); - if (rgs->blocks == 0) + if (g->blocks == 0) return 0; - if (mp->m_rtdev_targp && mp->m_rtdev_targp->bt_bdev_awu_min > 0) - return max_pow_of_two_factor(rgs->blocks); - return rounddown_pow_of_two(rgs->blocks); + if (btp && btp->bt_awu_min > 0) + return max_pow_of_two_factor(g->blocks); + return rounddown_pow_of_two(g->blocks); } /* Compute the maximum atomic write unit size for each section. */ static inline void xfs_calc_atomic_write_unit_max( - struct xfs_mount *mp) + struct xfs_mount *mp, + enum xfs_group_type type) { - struct xfs_groups *ags = &mp->m_groups[XG_TYPE_AG]; - struct xfs_groups *rgs = &mp->m_groups[XG_TYPE_RTG]; + struct xfs_groups *g = &mp->m_groups[type]; const xfs_extlen_t max_write = xfs_calc_atomic_write_max(mp); const xfs_extlen_t max_ioend = xfs_reflink_max_atomic_cow(mp); - const xfs_extlen_t max_agsize = xfs_calc_perag_awu_max(mp); - const xfs_extlen_t max_rgsize = xfs_calc_rtgroup_awu_max(mp); - - ags->awu_max = min3(max_write, max_ioend, max_agsize); - rgs->awu_max = min3(max_write, max_ioend, max_rgsize); + const xfs_extlen_t max_gsize = xfs_calc_group_awu_max(mp, type); - trace_xfs_calc_atomic_write_unit_max(mp, max_write, max_ioend, - max_agsize, max_rgsize); + g->awu_max = min3(max_write, max_ioend, max_gsize); + trace_xfs_calc_atomic_write_unit_max(mp, type, max_write, max_ioend, + max_gsize, g->awu_max); } /* @@ -757,7 +736,8 @@ xfs_set_max_atomic_write_opt( max(mp->m_groups[XG_TYPE_AG].blocks, mp->m_groups[XG_TYPE_RTG].blocks); const xfs_extlen_t max_group_write = - max(xfs_calc_perag_awu_max(mp), xfs_calc_rtgroup_awu_max(mp)); + max(xfs_calc_group_awu_max(mp, XG_TYPE_AG), + xfs_calc_group_awu_max(mp, XG_TYPE_RTG)); int error; if (new_max_bytes == 0) @@ -813,7 +793,8 @@ set_limit: return error; } - xfs_calc_atomic_write_unit_max(mp); + xfs_calc_atomic_write_unit_max(mp, XG_TYPE_AG); + xfs_calc_atomic_write_unit_max(mp, XG_TYPE_RTG); mp->m_awu_max_bytes = new_max_bytes; return 0; } |