diff options
| -rw-r--r-- | fs/xfs/libxfs/xfs_alloc.c | 111 |
1 files changed, 55 insertions, 56 deletions
diff --git a/fs/xfs/libxfs/xfs_alloc.c b/fs/xfs/libxfs/xfs_alloc.c index c548bb022aa6..2afa6bc80e24 100644 --- a/fs/xfs/libxfs/xfs_alloc.c +++ b/fs/xfs/libxfs/xfs_alloc.c @@ -1877,84 +1877,77 @@ xfs_alloc_space_available( */ STATIC int /* error */ xfs_alloc_fix_freelist( - xfs_alloc_arg_t *args, /* allocation argument structure */ - int flags) /* XFS_ALLOC_FLAG_... */ + struct xfs_alloc_arg *args, /* allocation argument structure */ + int flags) /* XFS_ALLOC_FLAG_... */ { - xfs_buf_t *agbp; /* agf buffer pointer */ - xfs_buf_t *agflbp;/* agfl buffer pointer */ - xfs_agblock_t bno; /* freelist block */ - int error; /* error result code */ - xfs_mount_t *mp; /* file system mount point structure */ - xfs_extlen_t need; /* total blocks needed in freelist */ - xfs_perag_t *pag; /* per-ag information structure */ - xfs_alloc_arg_t targs; /* local allocation arguments */ - xfs_trans_t *tp; /* transaction pointer */ - - mp = args->mp; + struct xfs_mount *mp = args->mp; + struct xfs_perag *pag = args->pag; + struct xfs_trans *tp = args->tp; + struct xfs_buf *agbp = NULL; + struct xfs_buf *agflbp = NULL; + struct xfs_alloc_arg targs; /* local allocation arguments */ + xfs_agblock_t bno; /* freelist block */ + xfs_extlen_t need; /* total blocks needed in freelist */ + int error; - pag = args->pag; - tp = args->tp; if (!pag->pagf_init) { - if ((error = xfs_alloc_read_agf(mp, tp, args->agno, flags, - &agbp))) - return error; + error = xfs_alloc_read_agf(mp, tp, args->agno, flags, &agbp); + if (error) + goto out_no_agbp; if (!pag->pagf_init) { ASSERT(flags & XFS_ALLOC_FLAG_TRYLOCK); ASSERT(!(flags & XFS_ALLOC_FLAG_FREEING)); - args->agbp = NULL; - return 0; + goto out_agbp_relse; } - } else - agbp = NULL; + } /* - * If this is a metadata preferred pag and we are user data - * then try somewhere else if we are not being asked to - * try harder at this point + * If this is a metadata preferred pag and we are user data then try + * somewhere else if we are not being asked to try harder at this + * point */ if (pag->pagf_metadata && args->userdata && (flags & XFS_ALLOC_FLAG_TRYLOCK)) { ASSERT(!(flags & XFS_ALLOC_FLAG_FREEING)); - args->agbp = NULL; - return 0; + goto out_agbp_relse; } need = XFS_MIN_FREELIST_PAG(pag, mp); - if (!xfs_alloc_space_available(args, need, flags)) { - if (agbp) - xfs_trans_brelse(tp, agbp); - args->agbp = NULL; - return 0; - } + if (!xfs_alloc_space_available(args, need, flags)) + goto out_agbp_relse; /* * Get the a.g. freespace buffer. * Can fail if we're not blocking on locks, and it's held. */ - if (agbp == NULL) { - if ((error = xfs_alloc_read_agf(mp, tp, args->agno, flags, - &agbp))) - return error; - if (agbp == NULL) { + if (!agbp) { + error = xfs_alloc_read_agf(mp, tp, args->agno, flags, &agbp); + if (error) + goto out_no_agbp; + if (!agbp) { ASSERT(flags & XFS_ALLOC_FLAG_TRYLOCK); ASSERT(!(flags & XFS_ALLOC_FLAG_FREEING)); - args->agbp = NULL; - return 0; + goto out_no_agbp; } } /* If there isn't enough total space or single-extent, reject it. */ need = XFS_MIN_FREELIST_PAG(pag, mp); - if (!xfs_alloc_space_available(args, need, flags)) { - xfs_trans_brelse(tp, agbp); - args->agbp = NULL; - return 0; - } + if (!xfs_alloc_space_available(args, need, flags)) + goto out_agbp_relse; /* * Make the freelist shorter if it's too long. * + * Note that from this point onwards, we will always release the agf and + * agfl buffers on error. This handles the case where we error out and + * the buffers are clean or may not have been joined to the transaction + * and hence need to be released manually. If they have been joined to + * the transaction, then xfs_trans_brelse() will handle them + * appropriately based on the recursion count and dirty state of the + * buffer. + * * XXX (dgc): When we have lots of free space, does this buy us * anything other than extra overhead when we need to put more blocks * back on the free list? Maybe we should only do this when space is @@ -1965,10 +1958,10 @@ xfs_alloc_fix_freelist( error = xfs_alloc_get_freelist(tp, agbp, &bno, 0); if (error) - return error; + goto out_agbp_relse; error = xfs_free_ag_extent(tp, agbp, args->agno, bno, 1, 1); if (error) - return error; + goto out_agbp_relse; bp = xfs_btree_get_bufs(mp, tp, args->agno, bno, 0); xfs_trans_binval(tp, bp); } @@ -1983,7 +1976,7 @@ xfs_alloc_fix_freelist( targs.pag = pag; error = xfs_alloc_read_agfl(mp, tp, targs.agno, &agflbp); if (error) - return error; + goto out_agbp_relse; /* Make the freelist longer if it's too short. */ while (pag->pagf_flcount < need) { @@ -1992,10 +1985,9 @@ xfs_alloc_fix_freelist( /* Allocate as many blocks as possible at once. */ error = xfs_alloc_ag_vextent(&targs); - if (error) { - xfs_trans_brelse(tp, agflbp); - return error; - } + if (error) + goto out_agflbp_relse; + /* * Stop if we run out. Won't happen if callers are obeying * the restrictions correctly. Can happen for free calls @@ -2004,9 +1996,7 @@ xfs_alloc_fix_freelist( if (targs.agbno == NULLAGBLOCK) { if (flags & XFS_ALLOC_FLAG_FREEING) break; - xfs_trans_brelse(tp, agflbp); - args->agbp = NULL; - return 0; + goto out_agflbp_relse; } /* * Put each allocated block on the list. @@ -2015,12 +2005,21 @@ xfs_alloc_fix_freelist( error = xfs_alloc_put_freelist(tp, agbp, agflbp, bno, 0); if (error) - return error; + goto out_agflbp_relse; } } xfs_trans_brelse(tp, agflbp); args->agbp = agbp; return 0; + +out_agflbp_relse: + xfs_trans_brelse(tp, agflbp); +out_agbp_relse: + if (agbp) + xfs_trans_brelse(tp, agbp); +out_no_agbp: + args->agbp = NULL; + return error; } /* |