diff options
Diffstat (limited to 'fs/xfs/libxfs/xfs_sb.c')
| -rw-r--r-- | fs/xfs/libxfs/xfs_sb.c | 147 |
1 files changed, 147 insertions, 0 deletions
diff --git a/fs/xfs/libxfs/xfs_sb.c b/fs/xfs/libxfs/xfs_sb.c index d9b94bd5f689..d485e14313c6 100644 --- a/fs/xfs/libxfs/xfs_sb.c +++ b/fs/xfs/libxfs/xfs_sb.c @@ -888,6 +888,109 @@ xfs_sync_sb( return xfs_trans_commit(tp); } +/* + * Update all the secondary superblocks to match the new state of the primary. + * Because we are completely overwriting all the existing fields in the + * secondary superblock buffers, there is no need to read them in from disk. + * Just get a new buffer, stamp it and write it. + * + * The sb buffers need to be cached here so that we serialise against other + * operations that access the secondary superblocks, but we don't want to keep + * them in memory once it is written so we mark it as a one-shot buffer. + */ +int +xfs_update_secondary_sbs( + struct xfs_mount *mp) +{ + xfs_agnumber_t agno; + int saved_error = 0; + int error = 0; + LIST_HEAD (buffer_list); + + /* update secondary superblocks. */ + for (agno = 1; agno < mp->m_sb.sb_agcount; agno++) { + struct xfs_buf *bp; + + bp = xfs_buf_get(mp->m_ddev_targp, + XFS_AG_DADDR(mp, agno, XFS_SB_DADDR), + XFS_FSS_TO_BB(mp, 1), 0); + /* + * If we get an error reading or writing alternate superblocks, + * continue. xfs_repair chooses the "best" superblock based + * on most matches; if we break early, we'll leave more + * superblocks un-updated than updated, and xfs_repair may + * pick them over the properly-updated primary. + */ + if (!bp) { + xfs_warn(mp, + "error allocating secondary superblock for ag %d", + agno); + if (!saved_error) + saved_error = -ENOMEM; + continue; + } + + bp->b_ops = &xfs_sb_buf_ops; + xfs_buf_oneshot(bp); + xfs_buf_zero(bp, 0, BBTOB(bp->b_length)); + xfs_sb_to_disk(XFS_BUF_TO_SBP(bp), &mp->m_sb); + xfs_buf_delwri_queue(bp, &buffer_list); + xfs_buf_relse(bp); + + /* don't hold too many buffers at once */ + if (agno % 16) + continue; + + error = xfs_buf_delwri_submit(&buffer_list); + if (error) { + xfs_warn(mp, + "write error %d updating a secondary superblock near ag %d", + error, agno); + if (!saved_error) + saved_error = error; + continue; + } + } + error = xfs_buf_delwri_submit(&buffer_list); + if (error) { + xfs_warn(mp, + "write error %d updating a secondary superblock near ag %d", + error, agno); + } + + return saved_error ? saved_error : error; +} + +/* + * Same behavior as xfs_sync_sb, except that it is always synchronous and it + * also writes the superblock buffer to disk sector 0 immediately. + */ +int +xfs_sync_sb_buf( + struct xfs_mount *mp) +{ + struct xfs_trans *tp; + int error; + + error = xfs_trans_alloc(mp, &M_RES(mp)->tr_sb, 0, 0, 0, &tp); + if (error) + return error; + + xfs_log_sb(tp); + xfs_trans_bhold(tp, mp->m_sb_bp); + xfs_trans_set_sync(tp); + error = xfs_trans_commit(tp); + if (error) + goto out; + /* + * write out the sb buffer to get the changes to disk + */ + error = xfs_bwrite(mp->m_sb_bp); +out: + xfs_buf_relse(mp->m_sb_bp); + return error; +} + int xfs_fs_geometry( struct xfs_sb *sbp, @@ -972,3 +1075,47 @@ xfs_fs_geometry( return 0; } + +/* Read a secondary superblock. */ +int +xfs_sb_read_secondary( + struct xfs_mount *mp, + struct xfs_trans *tp, + xfs_agnumber_t agno, + struct xfs_buf **bpp) +{ + struct xfs_buf *bp; + int error; + + ASSERT(agno != 0 && agno != NULLAGNUMBER); + error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp, + XFS_AG_DADDR(mp, agno, XFS_SB_BLOCK(mp)), + XFS_FSS_TO_BB(mp, 1), 0, &bp, &xfs_sb_buf_ops); + if (error) + return error; + xfs_buf_set_ref(bp, XFS_SSB_REF); + *bpp = bp; + return 0; +} + +/* Get an uninitialised secondary superblock buffer. */ +int +xfs_sb_get_secondary( + struct xfs_mount *mp, + struct xfs_trans *tp, + xfs_agnumber_t agno, + struct xfs_buf **bpp) +{ + struct xfs_buf *bp; + + ASSERT(agno != 0 && agno != NULLAGNUMBER); + bp = xfs_trans_get_buf(tp, mp->m_ddev_targp, + XFS_AG_DADDR(mp, agno, XFS_SB_BLOCK(mp)), + XFS_FSS_TO_BB(mp, 1), 0); + if (!bp) + return -ENOMEM; + bp->b_ops = &xfs_sb_buf_ops; + xfs_buf_oneshot(bp); + *bpp = bp; + return 0; +} |