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ext4: trim allocation requests to group size
If filesystem groups are artifically small (using parameter -g to mkfs.ext4), ext4_mb_normalize_request() can result in a request that is larger than a block group. Trim the request size to not confuse allocation code. Reported-by: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Theodore Ts'o <tytso@mit.edu> Cc: stable@vger.kernel.org
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@ -3133,6 +3133,13 @@ ext4_mb_normalize_request(struct ext4_allocation_context *ac,
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if (ar->pright && start + size - 1 >= ar->lright)
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size -= start + size - ar->lright;
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/*
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* Trim allocation request for filesystems with artificially small
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* groups.
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*/
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if (size > EXT4_BLOCKS_PER_GROUP(ac->ac_sb))
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size = EXT4_BLOCKS_PER_GROUP(ac->ac_sb);
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end = start + size;
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/* check we don't cross already preallocated blocks */
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