ext4: don't load the block bitmap for block groups which have no space
Add a short circuit check to ext4_mb_group_group() so that we don't bother to load the block bitmap for a block group which does not have any space available. (Or which does not have enough space until we are in desperation mode, i.e., when cr == 3.) Resolves-bug: https://bugzilla.kernel.org/show_bug.cgi?id=45741 Reported-by: mirek@me.com Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
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@ -1862,6 +1862,12 @@ static int ext4_mb_good_group(struct ext4_allocation_context *ac,
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BUG_ON(cr < 0 || cr >= 4);
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free = grp->bb_free;
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if (free == 0)
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return 0;
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if (cr <= 2 && free < ac->ac_g_ex.fe_len)
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return 0;
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/* We only do this if the grp has never been initialized */
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if (unlikely(EXT4_MB_GRP_NEED_INIT(grp))) {
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int ret = ext4_mb_init_group(ac->ac_sb, group);
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@ -1869,10 +1875,7 @@ static int ext4_mb_good_group(struct ext4_allocation_context *ac,
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return 0;
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}
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free = grp->bb_free;
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fragments = grp->bb_fragments;
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if (free == 0)
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return 0;
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if (fragments == 0)
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return 0;
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